Heat pump drying system for drying clothes by using roller and control method of heat pump drying system

Abstract

The invention discloses a heat pump drying system for drying clothes by using a roller and a control method of the heat pump drying system. The system comprises a heat pump system for drying the clothes, and an air inlet and an air outlet which are communicated with the roller for accommodating the clothes respectively, wherein the heat pump system comprises a compressor, a condenser, a throttling device and an evaporator which are connected with one another in turn through a refrigerant circulating pipeline to form a circulating system; the heat pump system, the air inlet and the air outlet are integrated through an upper cover plate and a lower cover plate; an air deflector, the evaporator, the condenser and an air supply fan are arranged between the air inlet and the air outlet in turn to form an air circuit; the compressor is sealed in closed space by the upper cover plate and the lower cover plate; and the air supply fan is a direct-current fan with a controllable rotating speed, and the rotating speeds at different drying stages are correspondingly controlled to reduce the load of the compressor. The heat pump drying system has the characteristics of saving energy and shortening drying time.

Description

technical field [0001] The invention relates to a clothes drying device, in particular to a heat pump drying system and a control method for tumble drying clothes. Background technique [0002] The following air circulation channel is arranged in the existing heat pump type clothes drying device: the heated air heated by the condenser in the heat pump cycle system is sent into the drying room containing the clothes, and the hygroscopic air which has taken moisture from the clothes is It is sent back to the evaporator for dehumidification, and the dehumidified air is heated by the condenser again and sent to the drying chamber. [0003] The following three factors will affect the temperature of the drying air entering the cylinder, which will affect the drying efficiency and the use environment of the washer-dryer or clothes dryer that adopts the drum heat pump drying method. 1. The limit pressure of the general compressor system is the saturation pressure corresponding to t...

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Problems solved by technology

[0003] The washing and drying all-in-one machine or clothes dryer adopting the drum heat pump drying method has the following three factors that will affect the temperature of the drying air entering the drum, which will affect the drying efficiency and the use environment

1. The limit pressure of the general compressor system is the saturation pressure corresponding to the refrigerant at 60°C. When the system reaches the limit pressure, the temperature of the air generally used for drying only reaches 50-60°C. The drying time is long, which is not conducive to the improvement of work efficiency. The increase will cause the compressor to be in a high-load state for many years, which will affect the service life of the compressor and reduce its reliability. Second, when the fan speed is constant and the air volume is constant, the heat dissipation to the outside will increase due to the ambient temperature, and the temperature of the drying air in the cylinder will increase. When falling, the temperature of the air entering the cylinder cannot be increased by adjusting the flow rate of the air, resulting in a decrease in drying efficiency

3. Although the evaporator is equipped with 2 layers of filter screens, there will still be some lint passing through and attached to the fins of the evaporator, reducing the heat transfer effect

[0006] Among these schemes, schemes 1 and 2 will cause heat loss and reduce the condensation dehumidification capacity; although scheme 3 will not cause heat loss, it will also reduce the condensation dehumidification capacity and prolong the drying time

The three schemes work under the safe pressure before reaching the ultimate pressure of the system, and the temperature of the air entering the cylinder for drying can only reach 50-60°C

[0009] The drying speed of the above-mentioned clothes drying device has not improved yet, and the time required for the drying process is still relatively long; in addition, if the compressor is in a high-load state, the failure rate is extremely high

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