JP2014018452A - Drum type dryer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drum type dryer with high efficiency and high reliability which continues its drying operation even if the ambient temperature is high.SOLUTION: The drum type dryer comprises a heat pump device configured to generate warm air to be fed into a rotary drum. The compressor of the heat pump device is driven by an inverter motor whose rotational frequency can be optionally changed. A controller changes the rotational frequency 37 of the compressor based on the ambient temperature detected by a temperature detection part. The drying efficiency and reliability of the drum type dryer are improved by detecting a case where a refrigerant temperature 36 is likely to exceed an upper limit value by using an ambient temperature, and, in the case, changing the rotational frequency 37 of the compressor to suppress an increase in the refrigerant temperature 36 while continuing the drying operation.

Description

  The present invention relates to a drum dryer.

  A compressor used in a conventional drum dryer cannot change the number of revolutions arbitrarily (see, for example, Patent Document 1).

  FIG. 3 is an explanatory diagram showing the relationship between the outside air temperature 34 and the rotational speed 35 of the compressor in a conventional drum dryer.

  The conventional drum dryer lowers the refrigerant temperature by stopping the rotation of the compressor when the outside air temperature 34 rises too much. In addition, the conventional drum dryer continues the drying operation by driving the compressor again when the outside air temperature 34 becomes lower than the set temperature.

European Patent No. 0467188

  Conventional drum dryers are provided with an upper limit value of refrigerant temperature and / or refrigerant pressure in order to protect the compressor. When the outside air temperature is high, the refrigerant temperature and / or the refrigerant pressure increases. When the refrigerant temperature and / or the refrigerant pressure exceeds the upper limit value, the compressor is stopped to protect the compressor. Thereafter, the compressor waits for the refrigerant temperature and / or the refrigerant pressure to drop due to heat radiation from the compressor and the like, and the compressor is driven again when it becomes a predetermined value or less.

  However, the drying operation is not sufficiently performed while the compressor is stopped. Further, when the compressor is re-driven, it is necessary to wait for a predetermined time until the refrigerant state is stabilized. For these reasons, the conventional drum dryer has a problem that it is difficult to perform an efficient drying operation.

  In order to solve the above-described problems, a drum dryer according to the present invention includes a rotating drum that accommodates an object to be dried, a heat pump device that generates hot air and a blower, and a circulation path that circulates the hot air to the rotating drum. , A temperature detection unit that detects the outside air temperature, and at least a control unit that controls the rotating drum, the air blowing unit, and the heat pump device. The compressor is driven by an inverter motor whose rotation speed is arbitrarily changed by the control unit, and the control unit is configured to rotate the compressor based on the outside air temperature detected by the temperature detection unit. To change.

  With this configuration, when the refrigerant temperature is likely to exceed the upper limit value, it is detected using the outside air temperature. Let

  When the outside air temperature is high, the drum dryer of the present invention eliminates the need to stop or restart the compressor by changing the rotation speed of the compressor, and is highly reliable by continuing the drying operation. An efficient dryer can be performed.

The block diagram of the drum type dryer in embodiment of this invention Explanatory drawing which shows the relationship between the external temperature of the drum type dryer and the rotation speed of the compressor Explanatory drawing which shows the relationship between the external temperature of the conventional drum type dryer and the rotation speed of a compressor

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments.

  FIG. 1 shows the configuration of a heat pump drying drum dryer.

  The rotating drum 1 has a rotating shaft 2. The rotating drum 1 is cantilevered by the bearing 5 of the back plate 4 that constitutes the back surface of the housing 3 and the rotating shaft 2. Further, the rotating drum 1 is supported from both sides by a roller 6 fixed to the housing 3.

  The drive motor 7 has a drum pulley 8A at one end of a motor rotation shaft, and rotates the rotary drum 1 via a drum belt 9 hung on the drum pulley 8A.

  In the fan case 10, a fan 13 that is a blower is provided. The fan 13 has a fan pulley 11 provided at the end of the fan rotation shaft. The drive motor 7 has a fan pulley 8B at the other end of the motor rotation shaft. The fan belt 12 is hung on the fan pulley 8B and the fan pulley 11, and the fan 13 rotates. Note that the air outlet 14 of the fan case 10 opens on the back surface of the rotating drum 1. An outside air inlet 31 is formed below the front surface of the housing 3, and outside air is introduced into the housing 3 by the cooling fan 32. A temperature detector 33 for detecting the outside air temperature is provided downstream of the cooling fan 32.

  A heat pump device 15 is disposed at the bottom of the housing 3. The heat pump device 15 includes a compressor 23, a condenser 24, an evaporator 25, and the like, and a refrigerant circulates therein. The air that has entered the heat pump device 15 from the duct 17 by the rotation of the fan 13 is dehumidified and heated by the heat pump device 15 and becomes hot air. The warm air enters the suction port 16 of the fan case 10 and enters the rotating drum 1 from the blowout port 14 of the fan case 10. The clothes that are to be dried are dried by the warm air that has entered the rotating drum 1. The hot air that has dried the clothes passes through the inside of the lid 18 from the opening at the front of the rotary drum 1, enters the duct 17, and returns to the heat pump device 15 again. In this way, a circulation path is formed and hot air circulates. In the drying operation, the rotary drum 1, the fan 13, the heat pump device 15, and the like are controlled by the control unit 28. The compressor 23 is driven by an inverter motor 30 whose rotation speed is arbitrarily changed based on a command from the control unit 28.

  FIG. 2 is an explanatory diagram showing the relationship between the refrigerant temperature 36 of the drum dryer and the rotational speed 37 of the compressor 23 in the present invention. The refrigerant temperature 36 is detected by a temperature sensor (not shown) attached to the refrigerant pipe or the like.

  When the outside air temperature is a normal temperature (for example, about 5 to 35 ° C.), the cooling fan 32 operates to lower the temperature in the housing 3, and accordingly, the temperature of the refrigerant in the compressor 23 also decreases. On the other hand, when the outside air temperature is high (for example, about 35 ° C. or higher), the cooling by the cooling fan 32 becomes insufficient, and the refrigerant temperature 36 exceeds the upper limit value (for example, 70 ° C.) as shown in FIG. Therefore, when the temperature detection unit 33 detects a predetermined temperature (for example, 35 ° C.) or higher, the control unit 28 decreases the rotational speed 37 of the compressor 23 as shown in FIG. Thereby, the temperature rise of a refrigerant | coolant is suppressed and a drying operation can be performed below an upper limit.

  As described above, the drum dryer according to the present invention reduces the rotation speed of the compressor 23 to a predetermined rotation speed when the outside air temperature is high, thereby preventing the compressor 23 from being stopped or restarted. Can continue. Thereby, a drum-type dryer with high efficiency and reliability can be provided.

  As described above, the drum dryer according to the present invention provides a highly reliable and efficient drum dryer by lowering the rotational speed of the compressor to a predetermined rotational speed when the outside air temperature is high. be able to.

DESCRIPTION OF SYMBOLS 1 Rotating drum 2 Rotating shaft 3 Case 4 Back plate 5 Bearing 6 Roller 7 Drive motor 8A Drum pulley 8B Fan pulley 9 Drum belt 10 Fan case 11 Fan pulley 12 Fan belt 13 Fan (fan part)
DESCRIPTION OF SYMBOLS 14 Outlet 15 Heat pump apparatus 16 Intake port 17 Duct 18 Lid 23 Compressor 24 Condenser 25 Evaporator 31 Outside air introduction port 32 Cooling fan 33 Temperature detection part 36 Refrigerant temperature 37 Rotation speed

Claims (2)

A rotating drum for storing the object to be dried;
A heat pump device and a blower for generating warm air;
A circulation path for circulating the warm air to the rotating drum;
A temperature detector for detecting the outside temperature;
At least the rotating drum, the air blowing unit, and a control unit for controlling the heat pump device,
The heat pump device has a configuration in which a compressor, a condenser, and an evaporator communicate with each other, and a refrigerant circulates inside.
The compressor is driven by an inverter motor whose rotational speed is arbitrarily changed by the control unit,
The said control part changes the rotation speed of the said compressor based on the external temperature which the said temperature detection part detected, The drum type dryer characterized by the above-mentioned.   2. The drum dryer according to claim 1, wherein when the outside air temperature detected by the temperature detection unit exceeds a predetermined temperature, the control unit decreases the rotational speed of the compressor.

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