The heat transfer effect of the electric heating tube directly affects the efficiency of the electric heating equipment. Therefore, after analyzing and discussing the factors that affect the heat transfer of the electric heating tube, it is easier for us to distinguish the superiority of the electric heating tube. From the point of view of purchase, it is convenient for the purchaser to judge, and from the perspective of the producer, it is convenient to find out the problem of the production of unqualified electric heating tubes. Therefore, it is necessary to discuss.
According to market data analysis data, in the electric heating tube manufacturing industry that relies on the small home appliance industry, it is currently difficult to achieve under the constraints of branded electric appliance manufacturers. If it cannot produce high-efficiency electric heating tubes to match it, or If it is eliminated or converted to low value-added products, it can be said that the efficiency of the electric heating tube determines the survival of the electric heating tube enterprise has become a top priority.
The factors that affect the electric heating efficiency of the electric heating tube can be summarized in one sentence: that is, the cumulative size of the thermal resistance on the heat transfer path determines the electric heating efficiency of the electric heating tube. A detailed analysis of the possibility of reducing thermal resistance according to various processes on the heat transfer path is as follows:
1. Material factors:
1. The purity of magnesium powder: The purity of magnesium oxide directly determines the thermal conductivity of magnesia. The larger the thermal conductivity, the smaller the thermal resistance. The higher the heat transfer efficiency, this is a material problem.
2. Density of magnesium powder: The density is determined by the filling density, shrinking tube or shaping density to determine the final density of the electric heating tube. The higher the density value, the higher the electric heating efficiency, and vice versa.
2. Structural design:
As we all know, the greater the distance between the outer diameter of the spiral heating wire and the inner wall of the metal shell, the higher the electrical insulation withstand voltage, but the heat transfer path increases. This increase in the heat transfer path is equivalent to the series connection of the heat transfer path. An attenuator will inevitably lead to a decrease in the electric heating efficiency, and the disadvantage of shortening this creepage distance is that the normal withstand voltage will drop significantly. The key now is how to evaluate the low electric heating efficiency and the impact of the electric heating tube. The performance impact is ultimately weighed.
The above description of the relationship between the characteristics of magnesia and the creepage distance on the electric heating efficiency, but in addition to the above content has a greater impact on the electric heating efficiency, there is also the last link in the heat transfer path, that is, the shell and tube material. In addition to the relationship between tube wall thickness and thermal resistance, we must also pay attention to the basic arrangement sequence of thermal resistance from small to large in the current four major application materials:
Copper<aluminum<iron<stainless steel, and use materials with good thermal conductivity as far as possible according to the actual allowable conditions, which will promote the improvement of the electric heating efficiency and the performance life of the electric heating tube to a certain extent.
The above content is only an introduction to the negative content caused by the main thermal resistance part. It does not include all factors, such as the type and content of silicone oil, and the type and thickness of the electroplating layer of the electric heating tube. Will continue to introduce the various problems encountered by the electric heating tube for analysis. Our factory is committed to producing: electric heating tube, stainless steel electric heating tube, heating tube, stainless steel heating tube, electric heating wire, mesh belt and other series. With advanced technology, high quality and excellent service, we wholeheartedly serve customers at home and abroad. .
