Common operation problems of refrigerator and solutions

1、 Reasons for noise of chiller:

(1) Blade rotation may conflict with air. The frequency of noise is compounded by a variety of frequencies, which are related to the speed of the fan.

(2) If the blade is subject to eddy current, it will also generate noise. During the operation of the fan, eddy current will occur on the back of its moving wing. This eddy current will not only reduce the power of the fan, but also cause noise. In order to reduce this phenomenon, the installation angle of the blade should not be too large, and the bending of the fan should be lubricated, and the sudden change should not be too large.

(3) When the noise occurs due to resonance with the air duct shell, the inner joint between the air duct and the fan shell shall be flat to prevent roughness and tearing sound.

2、 The temperature difference between the inlet and outlet of the chiller is too small.

(1) The output cooling capacity of the chiller is small, which may be due to the problem of the chiller itself and not fully loaded. These can be preliminarily judged by investigating the working current and other parameters of the chiller.

(2) It may also be that the heat transfer effect is not good, or that the heat transfer tube is seriously scaling, which affects the heat exchange of the chiller. This can be judged by investigating the temperature difference between the water temperature and the evaporation temperature.

(3) If the water flow is too large, it can be judged by investigating the inlet and outlet water pressure difference of the evaporator and the working current of the water pump.

(4) After eliminating the above problems, check whether the temperature gauge of the sensor is correct.

In addition, in planning, sometimes the air duct can be covered with sound insulation materials, which can effectively reduce noise. In addition to the fixed noise of the fan itself, there are many other noises, such as the abnormal noise caused by the lack of precision, improper installation or improper protection of the bearing. Noise may also occur in the motor part, some of which are caused by poor planning or poor manufacturing quality control, or may be caused by the internal and external cooling fans of the motor. Therefore, the industrial chiller must strictly screen the regular products in the selection of equipment, taking into account such factors as the humanized planning of the equipment.