JP2959185B2 - Dehumidifying dryer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dehumidifying and drying apparatus using a refrigerating apparatus.

[0002]

2. Description of the Related Art In recent years, with the overcrowding of urban areas, the effects of air pollution on outdoor drying, and the increase in the number of co-earning households, social conditions have changed, and indoors have no distinction between day and night and regardless of the weather. The need for drying is increasing.

Conventionally, this type of drying apparatus will be described below with reference to the drawings. FIG. 4 is a schematic side sectional view showing a conventional drying apparatus. This drying apparatus includes a drying chamber 1a for placing a material to be dried in a cabinet 1, a compressor 2, a condenser 3, a squeezing device (not shown), a two-way valve (not shown), an evaporator 4, and a blower 5. The refrigerator includes a refrigerating device 6 for removing moisture from the air in the drying chamber 1a, and a drain tank 7 that opens to the outside of the cabinet 1 below the evaporator 4.

[0004] The air containing moisture in the drying chamber 1 a is attracted by the blower 5 and passes through the evaporator 4. At this time, the air that has been cooled and from which moisture has been removed is then reheated by passing through the condenser 3 and returns into the drying chamber 1a. When the air humidity in the drying chamber decreases, the evaporation of the moisture in the object to be dried into the air is promoted, and the object to be dried is dried (Japanese Patent Application Laid-Open No. 60-111876).

[0005]

However, when the conventional dehumidifying and drying apparatus described above is operated, when it is operated at a low room temperature below the freezing point of water, the full water detection function and continuous drainage due to the freezing of the dehumidified water. Possible effects on functions (such as the possibility of water overflow after returning to operation) and other functional components are considered.

When the evaporator is frosted at a low room temperature, the dehumidifier / dryer performs a defrosting operation. However, if the suction temperature reaches a freezing point during the defrosting operation, the compressor is stopped to defrost. When the operation is stopped, the frost on the evaporator remains without being removed, and when this operation is repeated many times at low room temperature, the frost on the evaporator develops, affecting other functional parts and reducing the function of the evaporator. Conceivable.

Further, they become non-functional and do not drive the period of time the compressor there is defrosting operation, possible frost can not be performed defrosting operation and the compressor is off by temperature suction within this time grows There is.

Further, in drying clothes, futons, etc. using the above-mentioned dehumidifier / dryer, the suction temperature reaches a temperature at which the compressor should be stopped many times at a low room temperature, and the compressor must be stopped. Frequently occurs, the drying performance of clothes, futons and the like may be reduced.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a refrigeration system having a compressor, a condenser, a throttle device, an evaporator, a two-way valve and a blower, and detects a suction temperature of the refrigeration system. A temperature control device for detecting a temperature of a pipe of an evaporator of the refrigerating device, a temperature control device for stopping operation of the compressor based on a detected temperature of a suction air temperature detected by the temperature detection device, and A temperature control device is provided for opening and closing the two-way valve and performing a defrosting operation based on the pipe temperature of the evaporator detected by the temperature detecting means.

[0010]

According to the present invention, when the suction temperature of the refrigerating apparatus reaches a temperature slightly above the freezing point of water, the operation of the compressor is stopped and the growth of ice can be stopped. If the suction temperature reaches slightly above the freezing point of water during the defrosting operation , immediately
Priority is given to the defrost operation without stopping the compressor, and after the defrost operation is completed, the compressor is stopped. This melts the evaporator ice
Will not remain . In addition, the defrosting operation is not performed unless the compressor is operated for a predetermined time.However , even during normal operation, even if the suction temperature reaches a temperature slightly above the freezing point of water , the compressor is immediately stopped. Instead, perform the defrost operation once and then stop the compressor. This is effective in suppressing the growth of ice in the evaporator at low room temperature. Also,
When the suction temperature reaches a temperature slightly above the freezing point of water and the compressor is stopped, the fan is not stopped and continues to operate by blowing. This makes it possible to enhance the effect of drying at low room temperature when drying clothes, futons, and the like using the present dehumidifying dryer.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A dehumidifying dryer according to one embodiment of the present invention will be described below with reference to the drawings. In Figure 1, the refrigeration apparatus 6 compressor 2, a condenser 3, an evaporator 4, an aperture stop apparatus and the two-way valve blower 5 and is not shown for circulating air, drain tank under the evaporator 4 7 are provided. The refrigerating device 6 forms an air passage 8 having an open inlet 8a and an outlet 8b, and the evaporator 4, the condenser 3, and the blower 5 are arranged in this order between the inlet 8a and the outlet 8b. It is arranged in. Reference numeral 9 denotes a temperature thermistor (temperature detecting means 1) provided in the vicinity of the suction port 8a, and reference numeral 10 denotes operation of the compressor 2 based on the temperature detected by the temperature thermistor 9.
The temperature control device 11 to be stopped is a pipe temperature thermistor (temperature detecting means 2) provided in the pipe of the evaporator 4.

Next, the structure of the temperature control device 10 will be described with reference to the control block diagram of FIG. An input circuit 13 for determining the input of the operation stop switch 12 is provided in the temperature control device 10.
And a storage circuit 14 for storing a control set value T1 of the suction temperature and a control set value T2 of the pipe temperature of the evaporator, and output signals of the input circuit 13, the storage circuit 14, the suction temperature thermistor 9, and the pipe temperature thermistor 11. A determination circuit 15 for determining an operation mode in response to the
5 has an output relay circuit 16 for driving the compressor 2, the two-way valve and the blower 5 upon receiving the output of the blower 5.

Next, the operation of this embodiment will be described with reference to FIG. The operation stop switch 12 is pressed and the compressor starts.
When the normal refrigeration operation starts, the suction temperature is detected.
(Step 101), and the determination circuit 15 sets the control set value T
1 and the output signal of the suction temperature thermistor 9 are compared.
Step 102), the suction temperature Ta becomes the control set value T1.
If it falls below, the compressor 2 will eventually be stopped.
Before the operation, it is determined whether or not the dehumidifying operation is being performed (step 10).
3) If defrosting operation is in progress, compression after the defrosting operation is completed
The machine 2 is stopped (steps 104 and 105). Steps
If the defrost operation is not being performed in 103, the pipe temperature is detected (scan
Step 109) The pipe temperature Tb falls below the control set value T2.
If so, the defrosting operation is started (step 111),
After the end of the frost operation, the compressor 2 is stopped (step 10).
5). In step 110, the pipe temperature Tb is set to the control set value T2.
If it is not less than the value, the compressor 2 is immediately stopped (step
105). Blow when compressor 2 is stopped as described above
Operation is carried out continuously without locked stop. Compressor 2 stops
After step 105), the suction temperature Ta becomes the control set value.
If T3 is exceeded (steps 106 and 107), the compressor 2
The operation is restarted (step 108).

The defrosting operation is performed by a known hot gas defroster.
In this way, a compressor connecting the discharge side of the compressor 2 and the inlet side of the evaporator
By opening the two-way valve provided in the middle of the bus piping,
High-temperature discharge gas from compressor 2 is directly sent to evaporator 4
Have gone by that.

[0015]

As is clear from the above description, the present invention
A refrigerating device having a compressor, a condenser, a throttle device, an evaporator, a two-way valve and a blower, a temperature detecting means for detecting a suction temperature of the refrigerating device, and a piping for detecting a pipe temperature of an evaporator of the refrigerating device. Temperature detecting means, a temperature control device for stopping the operation of the compressor based on the detected temperature of the suction air temperature detected by the temperature detecting means, and a temperature at which defrosting is performed by opening and closing the two-way valve based on a pipe temperature of an evaporator. With a control device, when the suction temperature reaches a temperature slightly above the freezing point of water, the operation of the compressor is stopped,
The growth of ice in the drainage tank can be stopped. If the suction temperature reaches a temperature slightly higher than the freezing point of water during the defrosting operation, the defrosting operation is prioritized, and after the defrosting operation is completed, the compressor is stopped. This allows
Evaporator ice growth can be stopped. In addition, the defrosting operation is not performed unless the compressor is operated for a predetermined time, but if the suction temperature reaches a temperature slightly higher than the freezing point of water during this time, the defrosting operation is performed once, and then the compressor is operated. Stop. This is effective in suppressing the growth of ice in the evaporator at low room temperature. When the suction temperature reaches a temperature slightly higher than the freezing point of water and the compressor is stopped, the fan is not stopped and the operation is continued by blowing air. This makes it possible to enhance the effect of drying at low room temperature when drying clothes, futons, and the like using the present dehumidifying dryer.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of a dryer according to the present invention.

FIG. 2 is a block diagram of a temperature control device according to the embodiment.

FIG. 3 is a flowchart of the operation end detecting device in the embodiment.

FIG. 4 is a configuration diagram of a conventional dryer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cabinet 1a Drying room 2 Compressor 3 Condenser 4 Evaporator 5 Blower 6 Refrigerator 9 Suction temperature thermistor 10 Temperature control device 11 Pipe temperature thermistor

────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Shingo Hamada 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-60-181532 (JP, A) JP-A 64-64 46531 (JP, A) (58) Field surveyed (Int. Cl. ⁶ , DB name) F24F 11/02

Claims (4)

(57) [Claims] 1. A refrigerating apparatus having a compressor, a condenser, a throttle device, an evaporator, a two-way valve, and a blower, temperature detecting means for detecting a suction temperature of the refrigerating apparatus, and suction detecting by the temperature detecting means. A dehumidifying dryer provided with a temperature control device for stopping the operation of the compressor when the air temperature falls below a temperature slightly above the freezing point of water. A temperature detecting device for detecting a pipe temperature of an evaporator of the refrigerating apparatus; and a temperature control device for performing a defrosting operation by opening and closing a two-way valve based on the pipe temperature detected by the temperature detecting means. When the suction temperature reaches the temperature at which the compressor should be stopped during the defrosting operation, after the end of the defrosting operation,
The dehumidifying dryer according to claim 1, further comprising means for stopping the operation of the compressor . 3. In a dehumidifying dryer, when the suction temperature reaches a temperature at which the compressor should be stopped at a low room temperature, a defrosting operation is performed before the operation of the compressor is stopped, and the defrosting operation is performed after defrosting without fail. The dehumidifying dryer according to claim 1, further comprising means for stopping the operation of the dryer. 4. A means according to claim 1, further comprising means for continuing the operation of the fan to enhance the drying effect when the suction temperature reaches a temperature at which the compressor should be stopped at a low room temperature and the compressor is stopped. Dehumidifying dryer.