Copper water heat pipe used in solar water heater

Abstract

The invention discloses a copper water heat pipe used in a solar water heater, which comprises an evaporation segment and a condensation segment, wherein the evaporation segment and the condensation segment are of integrated structure in smooth transition connection. The copper water heating pipe has the advantages that: 1. the evaporation segment and the condensation segment are of the integrated structure in smooth transition connection without welding parts, so the mechanical performance of the copper water heat pipe is greatly improved, the service life of the copper water heat pipe is effectively ensured, and a superconducting liquid in the pipe can not leak when in use; 2. The inner walls and the outer walls of the evaporation segment and the condensation segment of the copper water heat pipe are in smooth transition, smaller resistance is generated in the air discharging process, simultaneously smaller resistance is generated when the superconducting liquid in the copper water heat pipe reflows, thereby improving the heat conductivity of the copper water heat pipe; 3. the wall thickness of the evaporation segment in the copper water heat pipe is larger than the wall thickness of the condensation segment, thereby increasing the strength of the condensation segment, and ensuring the service life of the copper water heating pipe; and 4. the automation degree for producing the copper water heat pipe is high, the production efficiency is high, and the production cost is low.

Description

technical field [0001] The invention relates to a solar water heater, in particular to a copper water heat pipe used in the solar water heater. Background technique [0002] my country is rich in solar energy resources. Two-thirds of the country's land area has an annual sunshine time of more than 2,200 hours, and the annual solar radiation energy exceeds 5,000 megajoules per square meter. For more than 20 years, my country's research and application in the field of solar energy The work has been deepened and remarkable results have been achieved. The solar water heater industry has developed rapidly, and its annual output and ownership rank first in the world. my country has become a major country in the production and use of solar water heaters in the world. The core components of solar water heaters are copper water heat pipes. Copper water heat pipes are widely used because of their superior thermal conductivity, thermal diodes and other technical features. At present, th...

AI Technical Summary

Problems solved by technology

The welded copper water heat pipe of this structure has the following disadvantages: 1. The connection part A between the evaporation section 1 and the condensation section 2 needs to be welded, and the temperature during welding is as high as 900 ° C, so that the copper water heat pipe at the connection part A The crystal phase structure of the copper water heat pipe changes, and the grains are coarse, which greatly reduces the mechanical properties of the copper water heat pipe, so that the service life of the copper water heat pipe cannot be effectively guaranteed, and the superconducting liquid in the copper water heat pipe is prone to leakage during use.

2. According to the working principle and technical characteristics of the copper water heat pipe, the internal structure of the copper water heat pipe should ensure zero resistance as far as possible during the design and production process. However, when the copper water heat pipe with the above structure is in use, the evaporation section 1 The upper step part E will generate greater resistance during the exhaust process, and will also generate greater resistance when the superconducting liquid in the tube returns, thereby reducing the thermal conductivity of the copper-water heat pipe and making the start-up temperature of the copper-water heat pipe Generally high, thus affecting the energy-saving effect of solar water heaters

3. The wall thickness of the evaporating section 1 and the condensing section 2 in the copper water heat pipe is the same, but in actual use, the pressure on the evaporating section 1 is greater than that of the condensing section 2, and the evaporating section 1 is easily damaged due to insufficient strength , affecting the service life of the copper water heat pipe

4. The degree of automation in the production of welded copper water heat pipes is low, the production efficiency is low, and the production cost is high

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