introduction

  Evaporation is the physical process of transforming a liquid into a gaseous state. Generally speaking, an evaporator is an object that converts a liquid substance into a gaseous state. There are a large number of evaporators in the industry, of which the evaporator used in refrigeration systems is one of them. The evaporator is a very important part of the four major components of refrigeration. The low-temperature condensed liquid passes through the evaporator, exchanges heat with the outside air, vaporizes and absorbs heat, and achieves the effect of refrigeration. The evaporator is mainly composed of two parts, a heating chamber and an evaporation chamber. The heating chamber provides the heat needed for evaporation to the liquid to promote the boiling and vaporization of the liquid; the evaporation chamber completely separates the gas and liquid phases.

The maintenance of the evaporator should do the following:

  1、Leak detection of the evaporator is often carried out. Leakage is a common failure phenomenon of evaporators, and you should pay attention to frequent leak detection during use. When the ammonia evaporator leaks, it has a pungent odor, and there is no frost at the leaking point. Phenolphthalein test paper can be used to check the leak, because ammonia is alkaline, it turns red when it meets phenolphthalein test paper. When you look at it, it is usually a leak point where there is no frost in the evaporator. You can also use soapy water to find the leak at the leak. Halogen lamps and halogen leak detectors can be used to check the leakage of Freon evaporator, and soapy water can also be used to find leaks. When checking, you can first check whether there are oil traces on the evaporation pipe. Because freon and oil are mutually soluble, when freon leaks, the oil will also leak out from the leakage point. Therefore, where there is oil, it will leak. When a halogen lamp is used for leak detection, if there is a Freon leak somewhere, the flame of the halogen lamp burns from blue to green, light green, grass green, purple green, purple and other colors to judge the amount of Freon leakage. If the flame is dark green or purple, the phosgene in the flame is poisonous, and this method cannot be used for long-term inspection. In this case, soapy water can be used to check for leaks. For minor leaks, a halogen leak detector should be used for leak detection.