JPS6019437B2 - heat pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat pipe in which heat transfer can be controlled.

Heat pipes generally have a wire mesh-like wick on the inside.
The wick is made of a closed hollow circular tube filled with working fluid, and one end of the wick has an evaporation section that evaporates the working fluid by heat applied from an external heat source, and as a result, It consists of an adiabatic part, which is the intermediate part where the steam pressure increases and the steam moves through the pipe, and a condensing part, which is the other end, where the latent heat of evaporation is transferred to the heat absorption source and condensed.

Here, the operating temperature of a conventional heat pipe is automatically determined depending on the conditions of the heat source and heat absorption source.

For example, increasing the heat load will increase the operating temperature of the pipe, and reversing the temperature gradient will also reverse the direction of heat transport. However, in actual applications, it may be necessary to interrupt the heat flow when the heat source temperature rises above a certain value. The present invention has been made to solve this need.

That is, the present invention mixes magnetic powder into the working fluid that fills the wick in the heat pipe having the above structure, and concentrates the magnetic powder at a certain location by the magnitude of the magnetic force generated by the magnetic field generation mechanism provided in the heat pipe. The flow rate of the hydraulic fluid is controlled by acting as a resistance against the flow of the hydraulic fluid. An embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a heat pipe having the following configuration.

That is, reference numeral 2 is a commonly used copper wick in the shape of a wire mesh, and is provided on the hollow inner wall of the heat pipe 1.

3 is a working fluid filled in the wick, such as aqueous ammonia.

Reference numeral 4 denotes magnetic powder, such as iron powder, mixed in the working fluid 3.

The size should be such that it can move freely within the wick 2. 5 is an ordinary multilayer field winding installed on the outside (preferably the center) of the heat pipe 1. Field flux is generated by passing current through the field winding, and the magnitude of the field flux is variable by adjusting the current. Occur.

6 is an evaporation section, 7 is a heat insulation section, and 8 is a condensation section.

Next, to explain the function of the heat pipe of the present invention, for example, the field winding 5 has 1. If a current with a current density of 100°C is flowing and the working fluid 3 is moving, and heat transfer of 100°C is taking place, 10 pi○ is in a superheated state, and if heat transfer of 80°C is the desired value. , the field current density is 2. If the field magnetic flux is strengthened as a result of M/N, the density of the magnetic powder 4 in the working fluid 3 near the field winding 5 will increase, the fluid resistance will increase, and the moving flow rate of the working fluid 3 will decrease, so that the desired temperature can be achieved. Heat transfer is possible.

The present invention is not limited to the above embodiments.

That is, in the above embodiment, the overheated state has been described, but it goes without saying that the reverse can be achieved, that is, the state can be changed from a low temperature state to a high temperature state. Note that the magnetic powder is not limited to iron powder, but may also be other magnetic materials such as cobalt, nickel, etc., and the shape of the heat pipe may be a hollow cylinder or a hollow prism.
The field winding can also be applied if it is used regularly. As described above, according to the present invention, magnetic powder is mixed into the working fluid, and the desired magnetic force can be generated by simply adjusting the current of the field winding provided on the outside of the heat pipe, depending on the density of the magnetic powder. Heat transfer can be controlled over a wide range by applying fluid resistance.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway sectional view of the heat pipe of the present invention. In the figure, 1...heat pipe, 2...wick, 3...working fluid,
4... Magnetic powder, 6... Field winding, 6... Evaporation section, 7... Heat insulation section, 8... Condensation section.

Claims (1)

[Claims] 1 In a heat pipe in which a wick is provided on the inner wall of a hollow rod-shaped container, the wick is filled with a working fluid, one longitudinal end of the wick serves as an evaporation part, the middle part serves as a heat insulating part, and the other end serves as a condensation part. , a field winding that generates a variable magnetic force by mixing magnetic powder into the working fluid and adjusting current flow to a position on the heat pipe where the magnetic powder is concentrated; A heat pipe characterized by the provision of a heat pipe.