JPH0112519B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a clothes dryer that uses a condenser of a refrigeration cycle consisting of a compressor, a condenser, a throttling mechanism, and an evaporator as a heat source. The present invention relates to a heat pump type clothes dryer that dries suspended damp clothes and is provided with means for detecting the completion of drying of the clothes and stopping its operation.

[Prior art]

Conventionally, in this type of dryer, for example,
As described in Publication No. 52-133374, there is a storage room for clothes, etc., a condenser and evaporator for supplying high-temperature dry air to this storage room, and a compressor for circulating refrigerant between the condenser and evaporator. In the dehumidifying dryer, the dehumidifying dryer includes a temperature sensing device in the storage chamber and a heater whose operation is controlled by the temperature sensing device in the storage chamber or the machine room. Dehumidifying dryers are known.

In addition, as in Japanese Patent Application Laid-open No. 188300, in a clothes dryer in which heated air obtained from a heater is sent into a rotating drum to dry clothes, and then the heated air is discharged from an exhaust duct, Clothes dryer operation control characterized by detecting the inflow air temperature or ambient air temperature and the exhaust temperature from the dryer, and controlling the heater output so that the difference between these two temperatures is maintained within a certain range. The method is also known.

[Problem to be solved by the invention]

As mentioned above, simply detecting the inflow air temperature and the exhaust air temperature and keeping the temperature difference between them within a certain range cannot reduce disturbances or detection variations and ensure drying. Ta.

[Means to solve the problem]

The heat pump type clothes dryer of this invention uses a refrigeration cycle condenser consisting of a compressor, a condenser, a throttling mechanism, and an evaporator as a heating source, and uses water that evaporates from damp clothes suspended in a closed space such as a bathroom. The air that has become humid is cooled, dehumidified, and then reheated to generate low-temperature dry air, which is then blown onto damp clothing. The temperature difference between the temperature of the intake air and the temperature of the air that has passed through the dryer air path, been cooled and dehumidified by the evaporator, and then heated by the condenser is detected at a predetermined period, and the temperature difference before and after this detection is detected. Drying is terminated when the comparison result is less than a predetermined set value.

[Embodiments of the invention]

Embodiments of the present invention are shown in the drawings and explained in detail below. Figure 1 is an overall configuration diagram of a dryer installed in a bathroom, Figure 2 is a diagram of the dryer configuration, Figure 3 is a refrigerant and air system diagram, and Figure 4 is a diagram showing temperature changes in each part during drying operation. In the figure, 1 is the dryer body, 2
is a compressor, 3 is a condenser that acts as a reheater, 4
1 is a throttle mechanism, 5 is an evaporator, 6 is an auxiliary electric heating device, 7 is a circulation blower, 8 is a suction port provided on the bottom surface of the main body, and 9 is a blowout port, as shown in FIG. The lower part of the dryer main body 1 is installed so as to correspond to the upper ceiling surface of the bathtub 31. 14 is a suction temperature detection section attached to the suction port (8), and 15 is a condenser outlet air temperature detection section. Note that 20 is damp clothing that has been washed and dehydrated and is suspended below the air outlet 9.

With the above configuration, damp clothes after washing and dehydration are hung in the bathroom 30, and the switch 41 of the dryer 1 is turned on.
When turned ON, the relay 42a is energized and this contact 42a is energized.
b turns on, compressor 2 and blower 7 start operating,
Dryer 1 is operated. At this time, since the initial temperature difference between the air temperatures 14 and 15 is 0 or very small, the temperature difference judgment device 43 disables the judgment of the temperature difference for, for example, 30 minutes immediately after startup, and thereafter does not perform the judgment function. It also provides a signal to the relay 44a.

The air that has become humid due to the evaporation of moisture from the clothes due to the operation of the dryer main body 1 is discharged through the suction port 8 on the bottom of the dryer main body.
The air is sucked into the clothing 2, cooled and dehumidified by the evaporator 5, heated (reheated) by the condenser 3, and then blown out from the air outlet 9 at a higher temperature and lower humidity than the suction temperature.
This corresponds to 0 drying. At this time, by evaporating moisture from the clothes, the air blown out from the main body is deprived of heat and becomes humid, and is sucked into the main body suction port 8. By repeating the above action, the moisture contained in the clothes gradually evaporates and the clothes are completely dried.

Changes in each part over time at this time will be explained with reference to FIG. In the figure, 10 is the discharge temperature, 11 is the condensing temperature, 12 is the cooler inlet temperature, 13 is the cooler inlet temperature, which represents the temperature of the refrigerant system, and 14 is the suction port 8.
15 is the temperature of the air blown out at the outlet 9 and represents the temperature of the air system. Furthermore, 16 is the dryer input, and 17 is the degree of dryness of the clothes, which is expressed as follows.

Dryness = Absolute dry weight / Damp clothing weight x 100 (%) Absolute dry weight: Weight of clothing that does not contain any moisture Next, to explain the changes in each part, at startup, there is insufficient refrigerant returned to compressor 2 However, the low pressure drops rapidly, the load is very small, and the compressor input 16 becomes very small. This phenomenon appears in the cooler inlet temperature 12, which temporarily drops suddenly. Next, the compressor load increases because the circulation of the refrigerant is gradually promoted. As a result, the cooler inlet temperature gradually recovers and begins to rise, and both the discharge temperature and the condensing temperature rise. Along with this, the air system suction temperature 14 and the condenser outlet temperature 15 also gradually rise. This increase continues until the amount of moisture evaporation from the clothes becomes stable and the refrigerant system becomes stable. After that, as the amount of moisture evaporation from the clothes gradually decreases, the load on the compressor 2 decreases, so the input starts to decrease. As a result, the discharge temperature 1
0, the condensing temperature 11, the condenser inlet temperature 12, and the condenser outlet air temperature 15 start to decrease when they reach the Mox temperature. Further, the suction air temperature 14 is largely due to the amount of moisture evaporated from clothing, and after stabilization, the latent heat load decreases and heat loss becomes small, so the temperature rises slowly. Further, the temperature at the outlet of the cooler continues to decrease as the coolant supply increases gradually from a high degree of superheating in a refrigerant shortage state to a low degree of superheating after startup.

The change in dryness level 17 is that at startup, the temperature of the blown air is low and the temperature of the clothes does not rise.
The evaporation of moisture is very small and the increase in dryness is very small, but as the compressor input increases, the temperature of the blown air also increases, so the dryness continues to increase, and then this increase decreases due to the decrease in moisture content. It becomes more gradual.

In the changes in each part that change over time as described above, the temperature difference between the condenser outlet air temperature 15 and the suction air temperature 14 gradually decreases after reaching the Mox value. This temperature difference △T is related to the degree of dryness, so for example, when dryness = 95% (this is the value when the air temperature is 20°C and clothing normally contains moisture), △ When drying is completed at T=3deg°C, the signals from the detection units 14 and 15 enter the temperature difference determiner 43, and when ΔT=3deg°C,
A signal is output, relay 44a is energized, and contact 44b is closed.
off, the relay 44a is disconnected, the contacts 42b are separated,
The compressor 2 and the blower 7 are cut off, and the dryer 1 is stopped.

Next, to explain the features of the present invention, in the bathroom clothes dryer, the means for detecting drying and stopping the operation is set to the temperature difference Δ between the suction air temperature 14 and the condenser outlet air temperature 15, as shown in FIG. Detect T at set time intervals, for example, every 10 minutes, and detect the temperature difference △ at time t _o+1 .
Set the temperature difference △T _o between T _o+1 and the previous time t _o to be constant, that is, △T _o −△T _o+1 = C (constant value), for example, C = 1 deg ℃. When drying is completed, operation will be stopped.

As described above, in the embodiment of the present invention, the detection is not continuous but performed every hour, so that the influence of detection accuracy and variation is reduced, and furthermore, it is not directly affected by external disturbances, external temperature changes, etc. , the completion of detection is ensured, and the effectiveness of undried and energy-saving effects is further improved.

〔Effect of the invention〕

As explained above, the present invention detects the temperature difference ΔT between the intake air temperature and the condenser outlet air temperature,
Furthermore, by comparing the detection results for each period of time, the detection of the completion of drying of the clothes is determined, so it is possible to prevent clothes from being left undryed or excessive operation, and to reduce disturbances and variations in detection. , drying can be completed more reliably.

[Brief explanation of drawings]

Fig. 1 is an overall block diagram of a dryer according to an embodiment of the present invention installed in a closed bathroom, Fig. 2 is a block diagram of the main body of a dryer according to an embodiment of the present invention, and Fig. 3 is similar to Fig. 2. Refrigerant and wind system diagram of the shown,
FIG. 4 is a curve diagram for explaining the changes over time in each part according to the embodiment of the present invention, and FIG. 5 is a detection diagram for explaining the embodiment of the present invention. In the figure, 1 is the dryer body, 2 is a compressor, 3 is a condenser, 4 is a throttle mechanism, 5 is a cooler, 6 is an electric heater, 7 is a blower, 30 is a bathroom, 20 is a clothes, 14 is the intake air temperature, and 15 is the condenser outlet air temperature. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] 1 Using the condenser of a refrigeration cycle consisting of a compressor, condenser, throttling mechanism, and evaporator as a heating source, the air becomes humid due to moisture evaporating from damp clothes hung in a closed space such as a bathroom. , a heat pump type clothes dryer that generates low-temperature dry air by reheating after cooling and dehumidifying, and then blows this generated air onto clothes to accelerate drying of damp clothes.
The completion of drying of damp clothes is detected by determining the temperature difference between the temperature of the air taken into the dryer, which changes depending on the degree of dryness of the clothes, and the temperature of the air that passes through the dryer air path, is cooled and dehumidified by the evaporator, and then heated by the condenser. A heat pump type clothes dryer, characterized in that the temperature difference is detected at a predetermined period, and drying is terminated when the comparison result of the temperature difference before and after the detection is equal to or less than a predetermined set value.