JP2006204708A - Washing and drying machine, and its drying control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a washing and drying machine capable of raising the temperature of a warm air to be discharged to a drum even when a circumferential temperature is low and raising the temperature of an object to be dried, so as to improve touch feeling in taking it out. <P>SOLUTION: The washing and drying machine comprises: the rotary drum 1 for storing the object to be dried 19; an intake duct 9 for allowing a condenser 3 to communicate with a rotary drum 1, internally having a condenser air blow fan 7; an exhaust duct 12 for discharging air from the rotary drum 1; an evaporator air intake duct 21 connected to an evaporator 4; an evaporator exhaust duct 22 connected to the evaporator, internally having an evaporator air blow fan 8; an air blow passage changing over means for changing over air blow passages between a first air blow passage by which the air flowing in the exhaust duct 12 is made to flow toward the evaporator 4 and a second air blow passage by which the air is discharge directly to an outer part and the outside air is simultaneously taken into the evaporator 4; and a control means for allowing the air blow passage changing over means to perform changeover into the first air blow passage in a prewarming drying period and a decreasing drying period and into the second air blow passage in a constant rate drying period. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a washing drier using a heat pump unit and a drying control method thereof.

In the conventional dryer, when the material to be dried has a relatively large amount of water, all the air that has come out of the drying chamber flows into the evaporator and the latent heat of condensation of water vapor contained in the air is recovered. If the moisture content of the object to be dried has been reduced by maintaining the heating capacity of the condenser, part of the air leaving the drying chamber and going to the evaporator is discharged out of the duct and the same amount as the discharged air. Wet air outside the duct is added to the evaporator inlet air in the duct (see, for example, Patent Document 1).
In addition, when an auxiliary heater is provided and the ambient temperature after drying is low, the auxiliary heater is energized until the temperature reaches a preset temperature, and the temperature of the object to be dried after drying is increased to improve the feel. (For example, refer to Patent Document 2).

JP-A-60-188786 (page 4-5, Fig. 2) Japanese Laid-Open Patent Publication No. 1-230397 (page 3-4, FIG. 1)

  In the conventional dryer, when the material to be dried has a relatively large amount of water, all the air that has come out of the drying chamber flows into the evaporator and the latent heat of condensation of water vapor contained in the air is recovered. If the moisture content of the object to be dried has been reduced by maintaining the heating capacity of the condenser, part of the air leaving the drying chamber and going to the evaporator is discharged out of the duct and the same amount as the discharged air. Moist air outside the duct was added to the evaporator inlet air in the duct. However, when the ambient temperature is low, the temperature of the air flowing into the evaporator is also low, so the temperature of the evaporator itself is low, and water vapor contained in the air is condensed and condensed to form frost on the evaporator. When the evaporator is frosted, the amount of air passing through the evaporator is reduced, the recovery energy obtained from the latent heat of condensation and the sensible heat from the air is reduced, and at the same time, the temperature of the object to be dried is lowered and the power consumption is increased. was there. In addition, when an auxiliary heater is provided and the ambient temperature is low after completion of drying, the auxiliary heater is energized until the temperature reaches a preset temperature, and the temperature of the object to be dried after completion of drying is increased. In addition, the amount of power consumption increases, and it is necessary to provide a separate auxiliary heater, which increases the cost.

  The present invention has been made in order to solve the above-described problems, and is a washing and drying machine that improves the temperature of the object to be dried by increasing the temperature of the object to be dried without increasing the energy consumption when the room temperature is low. The purpose is to provide.

  The washing and drying machine according to the present invention includes a heat pump unit to which a compressor, a condenser, a squeezing device, and an evaporator are connected, a rotating drum that is rotatably supported and stores an object to be dried, the condenser, and the rotating drum. An intake duct having a condenser blower fan inside, an exhaust duct having an exhaust port for exhausting air from the rotating drum, an evaporator intake port at one end, and the evaporator being connected to the other end. An evaporator intake duct, an evaporator exhaust duct connected to the evaporator and having an evaporator blower fan therein, and a first air passage for directing air flowing through the exhaust duct to the evaporator; Alternatively, the air path switching means for switching the air path to a second air path that causes the evaporator to take in outside air at the same time as exhausting directly to the outside, and the air path switching in the preheating drying period and the reduced-rate drying period Switching means to said first air passage, constant rate drying period is obtained and a control means for switching the air path switching means to the second air duct.

  The present invention provides a first air passage that directs the air flowing through the exhaust duct toward the evaporator, or a second air passage that causes the evaporator to take in outside air at the same time as it is exhausted directly to the outside. The air path switching means for switching the air path, the preheat drying period and the rate-decreasing drying period, the air path switching means is switched to the first air path, and in the constant rate drying period, the air path switching means is switched to the second air path. And a control means for switching to the air path, so that in the preheating drying period, the exhaust gas that hardly evaporates moisture from the material to be dried passes through the evaporator, and the thermal energy contained in the exhaust gas is recovered by the evaporator. As a result, the heating power of the condenser is increased, the intake air temperature to the drum can be increased, and the material to be dried can be preheated in a short time.

Also, during the constant-rate drying period, the exhaust from the drum is discharged directly into the room to prevent frost formation and the room air is taken into the evaporator, so that the heating power of the condenser does not decrease and the initial heating power is reduced. Thus, the material to be dried can be dried in a short time.
Also, during the rate-decreasing drying period, exhaust that does not form frost on the evaporator passes through the evaporator, and the heat energy contained in the exhaust is recovered by the evaporator, increasing the heating power of the condenser, The hot air discharge temperature can be increased, the temperature of the object to be dried can be increased, and the feel during removal can be improved.

Embodiment 1 FIG.
1 is a block diagram of a washing / drying machine showing Embodiment 1 of the present invention, FIG. 2 is a control block diagram, FIG. 1 (a) in FIG. 1 is a state in a preheating drying period and a decremental drying period, FIG. (B) shows the state of the constant rate drying period.
In FIG. 1, a rotary drum 1 is provided that is supported by a washing / drying machine 20 so as to be rotatable about a substantially horizontal axis, is rotationally driven by a drive mechanism 2, and stores an object to be dried 19 such as clothes. In addition, the condenser 3, the evaporator 4, the compressor 5, and the expansion device 6 are connected by pipes to constitute a heat pump unit. In addition, the condenser 3 and the rotary drum 1 communicate with each other, an intake duct 9 having a condenser blower fan 7 inside, an exhaust duct 12 having an exhaust port 13 for exhausting air from the rotary drum 1, and outside air is sucked into one end. An evaporator intake duct 21 having an evaporator intake port 14 and having the other end connected to the evaporator 4; an evaporator exhaust duct temperature sensor 31 connected to the evaporator 4 and having an evaporator blower fan 8 therein; A branch duct 16 branched from the exhaust duct 12 and connected to the evaporator intake duct 21 is provided. The exhaust duct 12 is provided with a temperature sensor 31 such as a thermistor for detecting the exhaust temperature.

  A first air path switching damper that closes the exhaust port 13 and opens the branch duct 16 or opens the exhaust port 13 and closes the branch duct 16 at the branch portion of the exhaust duct 12 and the branch duct 16. The air path switching damper A17 is provided, and the connection portion between the branch duct 16 and the evaporator intake duct 21 is configured such that the evaporator exhaust port 15 is closed and the branch duct 16 is opened, or the evaporator intake port 14 is opened. An air path switching damper B18, which is a second air path switching damper that opens and closes the branch duct 16, is provided.

Although not shown in FIG. 1, the first air path switching damper A17, the second air path switching damper B18, the condenser blower fan 7, the evaporator blower fan 8, the compressor 5, the drive mechanism 2, and the like are controlled. Control means to be described later is provided.
Although not shown in FIG. 1, the exhaust port 13 and the evaporator intake port 14 are closed by the first air path switching damper A17 and the second air path switching damper B18, respectively, and the exhaust from the rotary drum 1 is exhausted to the exhaust duct. 12, the branch duct 16 is closed by the first air path discharged through the branch duct 16, the evaporator 4 and the evaporator exhaust duct 22, or the first air path switching damper A17, and the second air path The switching damper B18 opens the evaporator intake port 14 so that the exhaust from the rotary drum 1 is directly discharged from the exhaust port 13 and at the same time the outside air is taken in from the evaporator intake port 14 and the evaporator 4 and the evaporator exhaust port 15 are opened. The control means 32 and the operation part 33 (FIG. 2) which switch to the 2nd air path exhausted through are provided.

In FIG. 2, the control means 32 is composed of a CPU, ROM as a memory, RAM, input I / O, and output I / O. A temperature sensor 31 and an operation unit 33 are connected to the input I / O and output. To the I / O, an air path switching damper A17, an air path switching damper B18, a condenser blower fan 7, an evaporator blower fan 8, a compressor 5, and the drive mechanism 2 are connected.
The air path switching damper A 17, the air path switching damper B 18, the condenser blower fan 7, the evaporator blower fan 8, and the drive mechanism 2 have a built-in drive motor.

Next, the operation of the washer / dryer according to the first embodiment of the present invention will be described.
First, the change in the dry state will be described with reference to FIG. FIG. 3 is an exhaust temperature characteristic diagram from the rotary drum 1 by the temperature sensor 31 of the exhaust duct 12 in the drying operation.
As shown in FIG. 3, the object to be dried 19 immediately after the start of the operation of the washing / drying machine 20 is warmed, and in the preheating drying period in which there is almost no water evaporation from the object to be dried 19, It changes in three patterns of the rate drying period and the rate-decreasing drying period in which the amount of water evaporated from the material to be dried decreases. In the preheat drying period, at the start of operation, the temperature is substantially the same as the intake air temperature, and the temperature rises as time passes. The added heat energy heats the object to be dried 19 containing moisture and the laundry dryer, so that the temperature of the object to be dried 19 and the laundry dryer 20 increases in proportion to the time, and the exhaust temperature also increases at the same time. Thus, it is a preheating drying period until exhaust temperature rises to predetermined temperature.

  Also, in the constant rate drying period, after the preheating drying period, the added heat energy is used to evaporate the moisture contained in the clothing, and the added energy and the evaporation energy of the moisture are balanced, so the exhaust gas is exhausted. The temperature is almost constant. The drying operation in which the temperature is substantially constant is the constant rate drying period.

  Further, in the rate-decreasing drying period, when the drying operation proceeds and the moisture contained in the clothing decreases, the moisture hardly evaporates. The evaporation energy decreases with respect to the added heat energy. Excess thermal energy that has not been used for evaporation heats the object to be dried 19 and the washing dryer 20, and as a result, the exhaust temperature rises. The drying operation in which the exhaust temperature rises again is the decreasing rate drying period.

An outline of the operation determined from such exhaust temperature characteristics will be described.
In the preheating drying period in which the object to be dried 19 is preheated, there is almost no water evaporation from the object to be dried, so the exhaust port 13 is closed by the air path switching damper A17 and the evaporator air inlet 14 is closed by the air path switching damper B18. By controlling, the exhaust from the rotary drum 1 passes through the evaporator 4, and the heat energy contained in the exhaust is recovered by the evaporator 4, thereby increasing the heating power of the condenser 3 and supplying the heat to the rotary drum 1. Increase the intake air temperature.

When the room temperature is lower than the predetermined temperature, dew condensation occurs when the exhaust from the drum 1 with high humidity passes through the evaporator 4, and frost forms on the evaporator 4 due to the low temperature. When frost formation occurs, the heat energy recovery of the evaporator is reduced and the heating power of the condenser 3 is also greatly reduced.
Therefore, in the constant-rate drying period in which the amount of water evaporated from the material to be dried 19 is large, the air path switching damper A17 is controlled to close the branch duct 16 side and the air path switching damper B18 is controlled to close the branch duct 16 side. The high-humidity exhaust from the rotary drum 1 is exhausted directly to the outside, and the evaporator 4 sucks indoor air with low humidity from the evaporator intake port 14 to prevent frost formation on the evaporator. The heating power of 3 is not reduced.

  Further, during the rate-decreasing drying period in which the amount of water evaporation from the object to be dried 19 decreases, control is performed so that the exhaust port 13 is closed by the air path switching damper A17 and the evaporator air inlet 14 is closed by the air path switching damper B18. As a result, the exhaust from the rotary drum 1 passes through the evaporator 4, and the heat energy contained in the exhaust is recovered by the evaporator 4, thereby increasing the heating power of the condenser 3, and Increase the air discharge temperature.

Next, a method for judging the preheating drying period, the constant rate drying period, and the decreasing rate drying period from the exhaust temperature characteristics shown in FIG.
(A) Preheating drying period The period until the exhaust temperature rises to a predetermined temperature is determined as the preheating drying period. The predetermined temperature is a temperature (Δt1 <TK1) at which the temperature change becomes smaller than the predetermined temperature.
(B) Constant-rate drying period The time when the exhaust temperature shows a substantially constant temperature (t _k ) within a predetermined temperature range is determined as the constant-rate dry period.
(C) Decreasing drying period The time when the exhaust temperature exceeds the predetermined temperature range (Δt2> TK2) and begins to rise is determined to be the end of the constant drying period, and is determined to be the start of the decreasing drying period.
(D) End of drying When the exhaust temperature further rises and rises to a predetermined temperature from the end of the constant rate drying period (Δt3> TK3), it is determined that the drying is finished.

  Next, details of the operation of the washing / drying machine will be described with reference to the flowcharts of FIGS. 4 is a main flowchart showing the entire drying operation, FIG. 5 is a flowchart of an initial setting subroutine, FIG. 6 is a flowchart of a preheating drying period end determination subroutine, FIG. 7 is a constant rate drying period setting subroutine flowchart, and FIG. Is a flowchart of a constant rate drying period end determination subroutine, FIG. 9 is a flowchart of a decreasing rate drying period setting subroutine, FIG. 10 is a flowchart of a drying end determination subroutine, and FIG. 11 is a flowchart of a drying end setting subroutine.

When the operation is started, the initial setting is performed by the initial setting subroutine of FIG. 5 in S1 of FIG.
In the initial setting subroutine, the air outlet 12 is closed by the air path switching damper A17, and the evaporator air inlet 14 is closed by the air path switching damper B18. Further, the condenser blower fan 7, the evaporator blower fan 8, the compressor 5 and the drive mechanism 2 are turned on (S11).

Next, the process proceeds to S2, and the preheat drying period end determination subroutine of FIG. 6 is executed. In the preheat drying period end determination routine, first, the temperature sensor 31 detects the exhaust temperature of the rotary drum 1 and writes the temperature t into the memory RAM (S21). Next, a temperature change Δt1 = t _n −t _n−1 is calculated from the temperatures t _n of the plurality of memory RAMs written in the memory RAM (S22). Then, when Δt1 reaches the predetermined value TK1 or less in S23, the process proceeds to S24, where the preheating drying period end flag is set. .
Next, the process returns to S3 (FIG. 4) of the main routine to determine the end of the preheating drying period. If the preheating drying end flag is set, the process proceeds to S4 (FIG. 4). If the preheating drying end flag is not set, the process returns to S2, and the process returns to the preheating period end determination routine (FIG. 6).
In S4, the constant rate drying period operation setting is performed by the constant rate drying period operation setting subroutine of FIG.

In the constant rate drying period operation setting subroutine, the exhaust port 13 is opened by the air path switching damper A17, and the evaporator air inlet 14 is opened by the air path switching damper B18 (S41).
The exhaust temperature of the rotary drum 1 by the temperature sensor 31 is a constant temperature (tk).

Next, the process proceeds to S5 and the constant rate drying period end determination routine of FIG. 8 is executed. In the constant-rate drying period end determination routine, first, the temperature sensor 31 detects the exhaust temperature of the rotary drum 1 and writes the temperature t into the memory RAM (S51). Next, a temperature change Δt2 = t _n −t _n−1 is calculated from the temperatures t _n of the plurality of memory RAMs written in the memory RAM (S52). When Δt2 reaches the predetermined value TK2 or more in S53, the process proceeds to S54, the constant rate drying period end flag is set, and the constant rate drying period temperature tk is written in the memory RAM. When Δt2 does not reach the predetermined value TK2 or less, the process proceeds to S55 and the constant rate drying period end flag is cleared.
Next, returning to S6 (FIG. 4) of the main routine, the end of the constant rate drying period is determined. If the constant rate drying end flag is set, the process proceeds to S7. If the constant rate drying end flag is not set, the process returns to S5 and returns to the constant rate drying period end determination routine (FIG. 8).
In S7, the reduction drying period operation setting is performed by the reduction drying period operation setting subroutine of FIG.

  In the decreasing rate drying period operation setting subroutine, the exhaust port 13 is closed by the air path switching damper A17, and the evaporator air inlet 14 is closed by the air path switching damper B18 (S71).

Next, proceeding to S8, the dry season end determination subroutine of FIG. 10 is executed. In the drying end determination routine, first, the temperature sensor 31 detects the exhaust temperature of the rotary drum 1, and writes the temperature t into the memory RAM (S81). Next, calculate the difference? T3 = t _n -t _k of the current temperature t written in the temperature tk and memory RAM of constant rate drying period (S82). When Δt3 reaches the predetermined value TK3 in S83, the process proceeds to S84, where the drying end flag is set. When Δt3 does not reach the predetermined value TK3, the process proceeds to S85, and the drying end flag is cleared.
Next, the process returns to S9 (FIG. 4) of the main routine to determine the end of drying. If the drying end flag is set, the process proceeds to S10 (FIG. 4). If the drying end flag is not set, the process returns to S8 and returns to the drying end determination routine (FIG. 10). In S10, the drying end setting is performed by the drying end setting subroutine of FIG.

  In the drying completion setting subroutine, the air outlet 12 is opened by the air path switching damper A17, and the evaporator air inlet 14 is opened by the air path switching damper B18. Further, the condenser blower fan 7, the evaporator blower fan 8, the compressor 5 and the drive mechanism 2 are each turned OFF (S101).

The above operation has been described. Next, an actual operation example will be described with reference to FIG.
In the preheat drying period, the temperature reaches 27 ° C. after 15 minutes from 21 ° C., the temperature change reaches 0.4 ° C./min, and the preheat drying period ends when this value is equal to or less than a predetermined value (TK1).
Next, the exhaust temperature becomes 27 ° C. in 16 minutes and becomes substantially constant (t _k ) in 120 minutes after 120 minutes, and the temperature change becomes 0.04 ° C./min. When it reaches 120 minutes, when the temperature change becomes 0.04 ° C./min or more and becomes a predetermined value T (K2) or more, the constant rate drying period ends and the decreasing rate drying period starts.
The decreasing rate drying period increases from 31 ° C. after 121 minutes to 37 ° C. after 155 minutes, and the temperature change is 0.18 ° C./min. The temperature difference Δt3 = t _n −t _k = 37−31 = 6 ° C. when the temperature reached 31 ° C. at the end of the constant rate drying period and 37 ° C. during the decreasing rate reached the predetermined value (Tk3). When drying is over.

  As described above, in the preheat drying period, since there is almost no water evaporation from the material to be dried, the exhaust port 13 is closed by the air path switching damper A17 and the evaporator air inlet 14 is closed by the air path switching damper B18. As a result, the exhaust from the rotary drum 1 passes through the evaporator 4, and the heat energy contained in the exhaust is recovered by the evaporator 4, thereby increasing the heating power of the condenser 3 and the intake air temperature to the rotary drum 1. The material to be dried can be preheated in a short time.

  Further, in the constant rate drying period in which the amount of water evaporated from the object to be dried is large, the air path switching damper A 17 is controlled to close the branch duct 16 side, and the air path switching damper B 18 is controlled to close the exhaust duct B 16 side. The high-humidity exhaust from the rotary drum 1 is exhausted directly to the outside, and the evaporator 4 can prevent frost formation on the evaporator by sucking indoor air having low humidity from the evaporator intake port 14. The heating power is not reduced, the initial heating power is maintained, and the material to be dried can be dried in a short time.

  Further, during the rate-decreasing drying period in which the amount of water evaporated from the object to be dried decreases, the air path switching damper A17 is controlled to close the exhaust port 13 and the air path switching damper B18 is controlled to close the evaporator intake port 14. Since the exhaust from the rotary drum 1 passes through the evaporator 4, the heat energy contained in the exhaust is recovered by the evaporator 4, so that the heating power of the condenser 3 is increased and the warm air from the hot air discharge port 11 is increased. Since the discharge temperature can be increased and the temperature of the material to be dried 19 can be increased, the feel during removal can be improved.

Embodiment 2. FIG.
In the first embodiment described above, whether the exhaust from the rotary drum 1 is directly exhausted or passed through the evaporator 4 is switched by controlling the air path switching damper A17 and the air path switching damper B18. Although the heating power 3 is increased, the present embodiment is configured to increase the hot air discharge temperature of the hot air discharge port 11 during the rate-decreasing drying period.
FIG. 13 is a block diagram of a washing / drying machine showing Embodiment 2 of the present invention, and FIG. 14 is a control block diagram. FIG. 13 is obtained by removing the branch duct 16, the air path switching damper A17, and the air path switching damper B18 in FIG. 1 of the first embodiment, and FIG. 14 is the air path switching damper A17 and FIG. Excluding the air path switching damper B18,
Since others are the same, description is abbreviate | omitted.

Next, the operation will be described. The main flowchart is the same as that in FIG. 4 of the first embodiment, and differs from FIG. 4 in the initial setting (S1) subroutine, constant rate drying period operation setting (S4), reduced rate drying period operation setting (S7) and This is the drying end setting (S10), and the others are the same.
Since the operation of the present embodiment is mainly different from that of the first embodiment in the decreasing rate drying period, the operation in the decreasing rate drying period will be mainly described, and the description will be omitted otherwise.
4 is a main flowchart showing the entire drying operation, FIG. 15 is a flowchart of an initial setting subroutine, FIG. 16 is a flowchart of a constant rate drying period setting subroutine, FIG. 17 is a flowchart of a decreasing rate drying period setting subroutine, and FIG. Is a flowchart of a subroutine for determining the completion of drying.

When the operation is started, the initial setting is performed by the initial setting subroutine of FIG. 15 in S1 of FIG.
In the initial setting subroutine, the condenser blower fan 7, the evaporator blower fan 8, the compressor 5 and the drive mechanism 2 are turned on (S11a).

Next, proceeding to S2, the preheating drying period end determination subroutine of FIG. 6 is performed in the same manner as in the first embodiment. Next, returning to S3 (FIG. 4) of the main routine, the end of the preheating drying period is determined in the same manner as in the first embodiment. If the preheating drying end flag is set, the process proceeds to S4 (FIG. 4). If the preheating drying end flag is not set, the process returns to S2, and the process returns to the preheating period end determination routine (FIG. 6).
In S4, the constant rate drying period operation setting is performed by the constant rate drying period operation setting subroutine of FIG.

In the constant rate drying period operation setting subroutine, the condenser blower fan 7, the evaporator blower fan 8, the compressor 5 and the drive mechanism 2 are kept ON (S41a).
Next, the process proceeds to S5 and the constant rate drying period end determination routine of FIG. 8 is executed in the same manner as in the first embodiment. Next, returning to S6 (FIG. 4) of the main routine, the end of the constant rate drying period is determined. If the constant rate drying end flag is set, the process proceeds to S7. If the constant rate drying end flag is not set, the process returns to S5 and returns to the constant rate drying period end determination routine (FIG. 8).
In S7, the reduction drying period operation setting is performed by the reduction drying period operation setting subroutine of FIG.

In the rate-decreasing drying period operation setting subroutine, the fan rotation speed of the condenser blower fan 7 is lowered from the rotation speed of the efficient drying period (S71a). In the rate-decreasing drying period, the amount of water evaporated from the object to be dried is reduced, the operation capacity of the condenser blower fan 7 is reduced, and the air volume passing through the condenser 3 is controlled to be small.
Here, the relationship between the air volume of the condenser blower fan 7 and the hot air discharge temperature of the hot air discharge port 11 will be described.
The heating power P [kW] obtained from the air temperature before and after passing through the condenser 3 can be expressed by the following equation.
Heating power P = (T ₁ -T ₀ ) · Q · C · ρ / 60 (kW) ---- (Equation 1)
Where T ₁ : condenser outlet temperature [° C.]
T ₀ : condenser inlet temperature [° C.]
Q: Air volume passing through the condenser [m3 / mi]
C: Specific heat of air [kJ / kg · ° C]
ρ: air density [kg / m3].
From Equation 1, the temperature difference (T ₁ −T ₀ ) between the outlet and the inlet of the condenser 3 can be expressed by the following equation.
Temperature difference (T ₁ −T ₀ ) = P / Q · C · ρ (° C.) -------- (Equation 2)
Since the amount of air passing through the evaporator 3 is not changed, the heating power P of the heat pump unit does not change. The temperature difference (T ₁ −T ₀ ) is inversely proportional to the air volume Q. For example, if the air volume Q is reduced by 20%, the temperature difference (T ₁ -T ₀ )
(T ₁ −T ₀ ) = P / 0.8 · Q · C · ρ
= 1.25 × P / Q · C · ρ
And the temperature rises by 25%.
Therefore, if the amount of air passing through the condenser 3 is reduced during the rate-decreasing drying period, the hot air discharge temperature of the hot air discharge port 11 is increased.

Next, proceeding to S8, the dry season end determination subroutine of FIG. 10 is executed in the same manner as in the first embodiment.
Next, the process returns to S9 (FIG. 4) of the main routine to determine the end of drying. If the drying end flag is set, the process proceeds to S10 (FIG. 4). If the drying end flag is not set, the process returns to S8 and returns to the drying end determination routine (FIG. 10). In S10, the drying end setting is performed by the drying end setting subroutine of FIG.

  In the drying end setting subroutine, the condenser blower fan 7, the evaporator blower fan 8, the compressor 5 and the drive mechanism 2 are turned off (S101a).

  As described above, in the preheating drying period, the exhaust from the rotary drum 1 does not pass through the evaporator 4 and the heating power of the condenser 3 is the same as the conventional one. The humid exhaust from the rotating drum 1 is exhausted directly to the outside, and the evaporator 4 can prevent the frost from forming on the evaporator by sucking indoor air having a low humidity from the evaporator intake port 14. The heating power does not decrease, the initial heating power can be maintained, and the material to be dried can be dried in a short time.

Further, during the rate-decreasing drying period, the hot air discharge temperature of the hot air discharge port 11 can be increased by reducing the amount of air passing through the condenser 3, and the temperature of the object to be dried 19 can be increased, and the feel at the time of removal. Can be better.
Even if the drying efficiency in the preheating drying period in the initial stage is low, the warm air discharge temperature of the hot air discharge port 11 is increased in the latter half, and the drying efficiency can be increased as a whole. It can be raised and the feel when taking out can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram of the washing-drying machine which shows Embodiment 1 of this invention. It is a control block diagram of the washing / drying machine which shows Embodiment 1 of this invention. It is an exhaust-air temperature characteristic figure in the drying operation of the washing dryer which shows Embodiment 1, 2 of this invention. It is a main flowchart of the drying operation of the washing / drying machine which shows Embodiment 1, 2 of this invention. It is a flowchart of the subroutine of the initial setting of the drying operation of the washing dryer which shows Embodiment 1 of this invention. It is a flowchart of the subroutine of the preheating drying period completion | finish determination of the drying operation of the washing dryer which shows Embodiment 1, 2 of this invention. It is a flowchart of the subroutine of the constant rate drying period setting of the drying operation of the washing dryer which shows Embodiment 1 of this invention. It is a flowchart of the subroutine of the constant rate drying period end determination of the washing dryer which shows Embodiment 1, 2 of this invention. It is a flowchart of the subroutine of the rate-decreasing drying period setting of the washing / drying machine which shows Embodiment 1 of this invention. It is a flowchart of the subroutine of the completion | finish determination of the washing-drying machine which shows Embodiment 1, 2 of this invention. It is a flowchart of the subroutine of the drying completion setting of the washing / drying machine which shows Embodiment 1 of this invention. It is a figure which shows the data of the exhaust air temperature in the drying operation of the washing / drying machine which shows Embodiment 1 of this invention. It is a block diagram of the washing-drying machine which shows Embodiment 2 of this invention. It is a control block diagram of the washing / drying machine which shows Embodiment 2 of this invention. It is a flowchart of the subroutine of the initial setting of the drying operation of the washing dryer which shows Embodiment 2 of this invention. It is a flowchart of the subroutine of the constant rate drying period setting of the drying operation of the washing dryer which shows Embodiment 2 of this invention. It is a flowchart of the subroutine of the rate-decreasing drying period setting of the washing dryer which shows Embodiment 2 of this invention. It is a flowchart of the subroutine of the drying end setting of the washing / drying machine which shows Embodiment 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotating drum, 2 Drive mechanism, 3 Condenser, 4 Evaporator, 5 Compressor, 6 Throttling device, 7 Condenser blower fan, 8 Evaporator blower fan, 9 Intake duct, 10 Condenser inlet, 11 Hot air discharge Outlet, 12 Exhaust duct, 13 Exhaust port, 14 Evaporator intake port, 15 Evaporator exhaust port, 16 Branch duct, 17 Air path switching damper A, 18 Air path switching damper B, 19 Dried object, 20 Washing dryer 21 evaporator intake duct, 22 evaporator exhaust duct, 31 temperature sensor, 32 control means.

Claims (7)

A heat pump unit to which a compressor, a condenser, an expansion device, and an evaporator are connected, and
A rotating drum that is rotatably supported and stores an object to be dried;
An intake duct having a condenser blower fan in communication with the condenser and the rotary drum;
An exhaust duct having an exhaust port for exhausting air from the rotating drum;
An evaporator intake duct having an evaporator inlet at one end and the evaporator connected to the other end;
An evaporator exhaust duct connected to the evaporator and having an evaporator blower fan inside;
A first air passage that directs air flowing through the exhaust duct toward the evaporator, or a second air passage that causes the evaporator to take in outside air while exhausting directly to the outside. Air path switching means for switching between,
Control means for switching the air path switching means to the first air path during the preheating drying period and the decreasing rate drying period, and for switching the air path switching means to the second air path during the constant rate drying period;
A washing and drying machine comprising: A heat pump unit to which a compressor, a condenser, an expansion device, and an evaporator are connected, and
A rotating drum that is rotatably supported and stores an object to be dried;
An intake duct having a condenser blower fan in communication with the condenser and the rotary drum;
An exhaust duct having an exhaust port for exhausting air from the rotating drum;
An evaporator air intake duct having an evaporator air inlet for sucking outside air at one end and the evaporator connected to the other end;
An evaporator exhaust duct connected to the evaporator and having an evaporator blower fan inside;
A branch duct branched from the exhaust duct and connected to the evaporator intake duct;
A first air path switching damper that closes the exhaust port and opens the branch duct, or opens the exhaust port and closes the branch duct;
A second air path switching damper that closes the evaporator inlet and opens the branch duct, or opens the evaporator inlet and closes the branch duct;
The exhaust port and the evaporator intake port are closed by the first and second air path switching dampers, respectively, and the exhaust from the rotating drum is sent to the exhaust duct, the branch duct, the evaporator, and the evaporator exhaust duct. The branch duct is closed by the first air passage to be discharged via the first air passage or the first air passage switching damper, the evaporator intake port is opened by the second air passage switching damper, and the rotating drum Control means for directly discharging the exhaust air from the exhaust port, and at the same time taking outside air from the evaporator intake port and switching to the second air path for exhausting through the evaporator and the evaporator exhaust duct;
The control means switches the air path switching means to the first air path during the preheating drying period and the reduced rate drying period by the first and second air path switching dampers, and the constant rate drying period. Is a washing and drying machine for switching the air path switching means to the second air path. A heat pump unit to which a compressor, a condenser, an expansion device, and an evaporator are connected, and
A rotating drum that is rotatably supported and stores an object to be dried;
An intake duct having a condenser blower fan in communication with the condenser and the rotary drum;
An exhaust duct having an exhaust port for exhausting air from the rotating drum;
An evaporator intake duct having an evaporator inlet at one end and the evaporator connected to the other end;
An evaporator exhaust duct connected to the evaporator and having an evaporator blower fan inside;
Control means for controlling the air volume of the evaporator fan;
With
The said control means makes the air volume of the said condenser ventilation fan less than a constant rate drying period in the rate-decreasing drying period, The washing dryer characterized by the above-mentioned. The exhaust duct has a temperature sensor for detecting the exhaust temperature,
The control means determines that the preheat drying period has ended when the temperature change detected by the temperature sensor becomes a predetermined value or less, and has shifted to a constant rate drying period, and the temperature change detected by the temperature sensor is greater than or equal to a predetermined value. When the constant rate drying period has ended, it has been determined that the drying rate has shifted to the decreasing rate drying period, and when the difference between the temperature of the constant rate drying period and the current temperature exceeds a predetermined value, 4. The washing / drying machine according to claim 1, wherein the washing / drying machine is determined. A heat pump unit to which a compressor, a condenser, a squeezing device, and an evaporator are connected, and a rotating drum that is rotatably supported and stores an object to be dried;
In the preheating drying period and the reduction drying period, the exhaust from the rotating drum is passed through the evaporator and then discharged to the outside. In the constant drying period, the exhaust is directly discharged to the outside and simultaneously the outside air is discharged to the evaporator. A drying control method for a washing / drying machine, wherein the suction drying is performed. A heat pump unit to which a compressor, a condenser, a squeezing device, and an evaporator are connected, and a rotating drum that is rotatably supported and stores an object to be dried;
A drying control method for a washing and drying machine, characterized in that the air volume of a condenser blower fan that sends outside air to the condenser during the rate-decreasing drying period is less than that during the constant-rate drying period. When the exhaust temperature change from the rotating drum becomes equal to or lower than a predetermined temperature, the preheating drying period is finished, and it is determined that the constant temperature drying period has been reached, and when the temperature change becomes equal to or higher than the predetermined temperature, the constant rate 6. It is determined that the drying period has shifted to the decreasing rate drying period, and when the difference between the constant-rate drying period temperature and the current temperature is equal to or greater than a predetermined value, it is determined that the drying has ended. 6. A drying control method for a washing and drying machine according to 6.

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