An ultra-long gravity heat pipe with enhanced carrying limit

Abstract

The invention discloses an ultra-long gravity heat pipe with enhanced carrying limit. The heat pipe comprises an upper sealing end cap, a heat pipe base, a lower sealing end cap and a vapor-liquid splitting device; the upper sealing end cap, the heat pipe base and the lower sealing end cap form a closed cavity, and the vapor-liquid splitting device Set in the heat pipe matrix, the gap between the vapor-liquid diversion device and the heat pipe matrix is ​​a condensate return channel; the central channel of the vapor-liquid diversion device is a gas ascending channel; the vapor-liquid diversion device Includes cable, cable bracket and cable clip. The present invention should be applicable to any occasion that needs to strengthen the carrying limit of the heat pipe. In the application, the present invention adopts a group of steel cables distributed near the wall of the heat pipe airtight cavity to block the rising steam and the descending condensed liquid film, reducing the impact of the rising steam flow on the heat pipe. The shearing force of the liquid film is reduced, the carrying limit of the heat pipe is improved, and the utility model has the advantages of simple structure, low cost and wide applicability.

Description

technical field [0001] The invention relates to the field of wellbore gravity heat pipes of oil production wells, in particular to an ultra-long gravity heat pipe with enhanced carrying limit. Background technique [0002] A heat pipe is an efficient heat transfer device that rapidly transfers heat from the hot end to the cold end through the phase change of the internal working fluid. Specifically, when the heat pipe is working, the working fluid absorbs heat and vaporizes at the hot end (evaporation section), and is transported to the cold end (condensation section) under the action of the saturated pressure difference between the hot end and the cold end to condense and release heat. Under the action of force, it flows back to the evaporation section to absorb heat again, so as to realize the circulating flow of working fluid. Gravity heat pipe refers to the heat pipe whose reflux driving force is gravity. [0003] Heat pipes have extremely high equivalent thermal condu...

AI Technical Summary

Problems solved by technology

When the heat pipe is working, the upward-flowing high-speed steam flow and the downward-flowing condensate film form a vapor-liquid counterflow. Under the shear force of the vapor-liquid interface, the liquid film backflow is hindered, which limits the heat transfer capacity of the gravity heat pipe.

(2) Liquid accumulation at the bottom of the ultra-long gravity heat pipe forms a heat transfer dead zone

(3) The steam flow path is long, the resistance is large, and it is difficult to flow to the condensation area

(4) If the heat pipe is too long, the liquid film in the evaporation section may rupture and dry up, reducing the heat transfer performance

This principle should also be applicable to ultra-long gravity heat pipes, but there are technical difficulties and cost constraints in setting coaxial conduits in ultra-long heat pipes

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