Internally-threaded copper tube and heat exchange equipment with same

Abstract

The invention discloses an internally-threaded copper tube which comprises a tube body, wherein an internal thread is arranged on the inner surface of the tube body; the tooth profile of the internal thread is triangular; and the bottom wall thickness t of the internal thread is 0.35-0.4 mm. The invention further provides heat exchange equipment with the internally-threaded copper tube. According to the invention, the internal thread is set to be triangular, which structure ensures that no or a few dry regions can appear and meanwhile a liquid film formed on the surface of the internal thread can be pierced, so that the amount of heat exchange between a carbon dioxide refrigerant and the pipe wall of the internally-threaded copper tube is increased and the heat transfer effect is improved; and the bottom wall thickness of the internal thread is set to be 0.35-0.4 mm and can meet the 3-8 MPa operating pressure requirement of the carbon dioxide refrigerant, so that the strength of the internally-threaded copper tube is enhanced, and the problem of leakage or burst is avoided.

Description

technical field [0001] The invention relates to the technical field of heat exchange, in particular to an internally threaded copper tube and heat exchange equipment with the internally threaded copper tube. Background technique [0002] Internally threaded copper tubes are the key heat transfer materials for evaporators in air conditioners or heat pump water heaters. With the rise in copper prices and the country's increased energy efficiency requirements for units, internally threaded copper tubes are developing in the direction of thinner diameters and thinner walls, but Too small a pipe diameter will increase the resistance of the refrigerant, and too thin a pipe wall will increase the possibility of leakage and bursting of the working copper pipe. [0003] The existing internal threaded copper tube structure in China is usually designed for common refrigerant (R22, R134a, R410a) air conditioners or heat pump water heaters, but when carbon dioxide is used as the refriger...

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Problems solved by technology

[0002] Internally threaded copper tubes are key heat transfer materials for evaporators in air conditioners or heat pump water heaters. With the rise in copper prices and the country's increased energy efficiency requirements for units, internally threaded copper tubes are developing in the direction of thinner diameters and thinner walls. Too small a pipe diameter will increase the resistance of the refrigerant, and too thin a pipe wall will increase the possibility of leakage and bursting of the working copper pipe

[0003] The existing internal threaded copper tube structure in China is usually specially designed for common refrigerant (R22, R134a, R410a) air conditioners or heat pump water heaters. When carbon dioxide is used as the refrigerant, the operating pressure of carbon dioxide air conditioners or heat pump water heater units 3-4 times (3-8MPa), and the special thermal properties and transport properties of carbon dioxide refrigerants, make its evaporation heat transfer and two-phase flow characteristics different from traditional refrigerants, resulting in the existing common internal threaded copper tubes unable to meet the requirements The demand is specifically reflected in the fact that when using carbon dioxide refrigerant, the copper tube wall will be too thin to leak or burst, and the heat exchange liquid film is more likely to be torn and damaged, and dry areas are prone to appear, which eventually leads to a decrease in heat transfer effect and heat transfer is affected. influences

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