JPS615896A - Heat pump type clothing dryer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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, 9, for example, JP-A-57-2
As disclosed in Japanese Patent No. 09098, a refrigeration cycle is used to increase the amount of moisture removed per unit air volume, especially by dividing the condenser, heating the suction air, and applying it to damp clothing to lower the temperature by evaporation of moisture from the clothing. It has been proposed that the above object can be achieved by heating the air again in another condenser and applying it to the clothes again. However, there is no mention of means for detecting the completion of drying of clothes.

[Summary of the invention]

This invention has a built-in refrigeration cycle, generates low-temperature drying air, and accelerates drying by applying this air to damp clothes.It also has a drying photon detection means, and eliminates unnecessary operation after drying the clothes. To provide a clothes dryer that reduces energy consumption by eliminating problems such as stopping the dryer when clothes are not dried.

[Embodiments of the invention]

Embodiments of the present invention are shown in the drawings and explained in detail below. 1st
The figure shows the overall configuration of a dryer installed in a bathroom, Figure 2 is a dryer configuration diagram, 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 figure 99,
(1) is the main body of the dryer, (21 is the compressor, (3) is the condenser that acts as a reheater, (is the throttling mechanism, (5) is the evaporator, (6) is the auxiliary electric heater, (7) ) is a circulation blower, (8
) is the suction port provided on the bottom of the main unit.

Reference numeral (9) is also the air outlet, and as shown in FIG. 1, a suction temperature detecting section is attached to the bath, and α9 is a condenser outlet air temperature detecting section. Note that (2) is damp clothing that has been washed and dehydrated, suspended below the Suita exit 191.

According to the above configuration, the damp clothes after washing and dehydration are bathed, the compressor (21) and the blower (7) are operated, and the dryer il+ is operated.At this time, the air temperatures I and 19 are at the initial Since the temperature difference is 0 or very small, the temperature difference determiner (43)
Immediately after startup, for example, 30 minutes, the temperature difference determination is canceled, and after that, it has a determination function and provides a signal to the relay (44a).

Inui 1#! Air that has become humid due to the evaporation of moisture from clothing during the operation of the main unit (1) is sucked into the suction port (8) on the bottom of the main unit, cooled and dehumidified by the evaporator (5), and then transferred to the condenser 1.
It is heated (reheated) by the air outlet (9+) and blows out air at a higher temperature than the suction temperature and low humidity from the air outlet (9+) to dry the clothes.At this time, by evaporating the moisture from the clothes,
The air blown out of the main body loses heat and becomes humid, and is sucked into the main body suction port (8). By repeating the above process, the moisture contained in the clothes gradually evaporates and the clothes are completely dry.

Changes in each part over time at this time will be explained with reference to FIG. In the figure, tl (I is the discharge temperature, αpVi condensation temperature [,
Q2 is the cooler inlet temperature, 113 is the cooler inlet temperature and represents the temperature of the refrigerant system, t1# is the intake air temperature at the suction port 18+, and 4 is the blowout air temperature at the outlet (9), which is the air system temperature. Furthermore, US is the dryer input, and 11 is the degree of dryness of the clothes, which is shown below.

8 weight 1 ton: If we explain the changes in each part based on the weight method of clothes that do not contain any moisture, the compressor will be small at startup. this#
This phenomenon appears in the cooler inlet temperature UZ, 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 as it begins to rise, both the discharge temperature and the condensing temperature rise. Along with this, the air system suction temperature 04. The condenser outlet temperature US also gradually increases. This increase continues until the amount of moisture evaporation from the beams stabilizes and the refrigerant system stabilizes, and thereafter the amount of moisture evaporated from clothing gradually decreases.

The input begins to decrease as the load on the compressor (2) decreases. As a result, the discharge temperature is 4 and the condensation temperature is αυ.

Cooling seepage rate α2. The condenser outlet air temperature a9 is MO
When the temperature reaches x, it starts to decrease. Father, intake air temperature I
is caused by 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. Furthermore, the temperature at the outlet of the cooler continues to decrease as the refrigerant supply gradually increases from overheating due to lack of refrigerant after startup to a low degree of superheating.

The change in dryness aη is such that at startup, the temperature of the blown air is low and the temperature of the clothes does not rise, so the evaporation of moisture is very small and the increase in dryness is very small. As the input increases, the temperature of the blown air also increases, so the dryness progresses, and then this increase slows down as the moisture content decreases.

As mentioned above, in the changes in each part over time, the temperature difference between the condensing outlet air temperature 4 and the suction air temperature I is still Mox11i! After that, it gradually decreases. This temperature difference ΔT is related to the degree of dryness, so for example, when the degree of dryness is −95 degrees (this is the value when the air temperature is 20°C and clothes normally contain moisture), ΔT =
When the drying is completed at 3 degrees Celsius, the temperature difference determiner (45) cuts off the signals of the detection parts I and Q9, the contact (42b) separates, and the compressor (2) and the blower (7) cut off to complete the drying process. Machine (1) stops.

As described above, the embodiment of the present invention has a drying completion detection means by detecting the temperature difference between the suction air temperature I and the condensed outlet air temperature α9, so that the dryer is automatically stopped. This makes it possible to reduce the waste of energy due to undrying of clothes or wasteful operation after drying, and the effects of ease of use and energy saving are very large.

In the embodiment of the present invention, completion of drying is detected based on the temperature difference with the condenser outlet air temperature, but in a dryer without an auxiliary electric heater (6), the temperature difference with the outlet air temperature is detected. Also in detection.

It is a matter of course that it has the same effect as above.

Next, another embodiment of the present invention will be briefly described. In a bathroom clothes dryer according to another embodiment of the present invention,
The means for detecting dryness and stopping the operation is based on the temperature difference △ between the suction air temperature I and the condenser outlet air temperature a9, as shown in FIG.
T is detected every 10 minutes, for example, for 9 hours tn.
+1 temperature difference ΔTn+"1 and the temperature difference ΔTn at the previous time t. The temperature difference is constant.

In other words, set it to ΔTn-ΔTn+1-0 (constant value) 9
For example, when the temperature reaches C-1 degree Celsius, drying is completed and the operation is stopped.

As described above, in other embodiments of the present invention, the detection is performed not continuously but every time, so that the influence of fluctuation on the detection accuracy is reduced.
Since such effects are not directly affected, detection completion is certain, and the effectiveness of undried and energy saving effects is further improved.

〔Effect of the invention〕

As explained above, in this invention, the completion of drying of clothes is detected based on the temperature difference ΔT between the suction air temperature and the condenser outlet air temperature, so that it is possible to prevent clothes from being left undryed or from being over-dried. This has a significant energy saving effect. Furthermore, if the completion of drying of the clothes is determined by comparing the detection results for each certain time period, disturbances or variations in detection can be reduced, so that the completion of drying can be more reliably determined.

[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 one shown. FIG. 4 is a curve diagram for explaining changes over time in each part according to an embodiment of the present invention, and FIG. 5 is a detection diagram for explaining an embodiment of a song according to the present invention. In the figure, il+ is the dryer main body, (2) is the compressor, (
3) is a condenser, (4) is a throttle mechanism, (5) is a cooler, (
61 is an electric heater. (7) is the blower, (to) is the bathroom, lA is the clothes,
+141 is the intake air temperature, and 09 is the condenser outlet air temperature. Note that the same reference numerals in Figure 9 indicate the same or equivalent parts.

Claims (2)

[Claims] (1) A clothes dryer that uses the condenser of a refrigeration cycle consisting of a compressor, a condenser, a throttle mechanism, and an evaporator as a heat source, and the water that evaporates from damp clothes suspended in a closed space such as a bathroom. The heat pump type clothes dryer is designed to cool and dehumidify the humid air, then reheat it to generate low-temperature dry air, which is then blown onto the clothes to accelerate the drying of the damp clothes. The completion of drying of clothes is detected based on the temperature difference between the temperature of the suction air of 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 is then heated by the condenser. A heat pump type clothes dryer characterized in that the drying completion of clothes is detected by (2) Detect the temperature difference between the intake air temperature and the heated air temperature at a predetermined period, further compare the temperature difference before and after the detection, and drying ends when the temperature difference is below a predetermined set value. A heat pump type clothes dryer according to claim 1, characterized in that: