Efficient heat-exchanging pipe of evaporator for electric refrigerator set

Abstract

A high-efficiency heat-exchange tube for evaporators of electric refrigerating units comprises a fin part with external disposed fins. On the inside surface of the heat-exchange tube are disposed at least eight pieces of primary internal teeth and at least eight pieces of secondary internal teeth. The above primary internal teeth and the secondary internal teeth are crossed each other.

Description

technical field [0001] The invention relates to an evaporation heat exchange tube, in particular to a heat exchange tube used in an evaporator of an electric refrigeration unit. Background technique [0002] Since the advent of air-conditioning and refrigeration technology, with the development of science and technology, there have been great changes and developments in the structure, performance and type of the unit. As the core component of the refrigerator, the evaporator, one of the "two devices", has put forward higher requirements for the heat exchange tube, one of the core components, with the continuous development of refrigeration and air-conditioning technology. Small, thin-walled, Lightweight and high efficiency are the mainstream. With the emergence of various high-efficiency tubes, the performance of refrigerators has made great progress. The current heat exchange tubes generally contain refrigerant inside the tube and refrigerant water outside the tube. The r...

AI Technical Summary

Problems solved by technology

The current heat exchange tubes generally have refrigerant inside the tube and refrigerant water outside the tube. The refrigerant in the tube absorbs the heat of the refrigerant outside the tube through the tube wall and evaporates, thereby reducing the temperature of the refrigerant to achieve the cooling effect.

In the existing heat transfer tubes with similar functions, although a lot of work has been done on the outer fins, such as triangular outer fins, trapezoidal outer fins, etc., the heat exchange tubes are limited to low fin numbers and low Therefore, the heat exchange efficiency of the refrigerant inside the existing electric refrigeration heat transfer tube has not been improved.

The existing heat exchange tubes for refrigerators mainly have the following defects: 1) The heat exchange tubes are equipped with a large number of blades (ie thin sheet fins) on the ordinary smooth copper tubes to increase the heat dissipation area, but the fins assembled on the heat exchange tubes It not only increases the cost, but also increases the overall weight of the heat exchange tube, and because the fins assembled on the heat exchange tube have thermal resistance, heat exchange cannot be performed effectively, so the temperature of the working medium in the heat exchange tube cannot be quickly reduced; 2) Slightly trapezoidal fins are processed on the outer surface of the heat exchange tube, and grooves are opened on the top surface of the fins. Although the trapezoidal fins with grooves increase the heat dissipation area, the condensing agent drops to the fins. When there are grooves on the sheet, it will accumulate in the groove until the groove is full, so it is difficult to form a thin layer of heat exchange film on the surface of the tube, which reduces the heat exchange rate of the tube; 3) The inner surface of the heat exchange tube is generally set For light pipes to reduce the possibility of dirt concentrating on the inner surface of the pipe, or set a small number of internal gears on the inner surface, or set low-toothed internal teeth with extremely low tooth heights on the inner surface (such as usually adopted as The internal tooth height is 0.15~0.18mm), so the contact area between the inner surface of the tube and the refrigerant in the tube is small, and the heat exchange rate is also low

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