JPH0145560B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heat pipe whose heat transfer can be controlled.

Heat pipes have excellent thermal properties and are used in all fields for heating and cooling objects.

Conventional technology Heat pipes usually transport heat according to the heat load.

This is because the operating temperature of the heat pipe is determined by the conditions of the heat source and heat absorption source, and the working fluid, which is the medium for heat transport, is repeatedly changed between the gas phase and the liquid phase in an appropriate manner.

However, here, for example, a situation occurs in which the amount of heat transported in response to a heat load deviates from a desired value, resulting in an overheating or undercooling state.

Under such conditions, the transported heat is naturally not used effectively, resulting in a decrease in thermal efficiency.

Problems to be Solved by the Invention The present invention has been made in view of the above circumstances.
The purpose is to control the transferred heat according to the state of the heat source and heat absorption source, that is, the heat load, to make the heat transport of the heat pipe effective, and to prevent the object to be heated from being overheated or overcooled.

Means to be Solved by the Invention A wick is provided on the inner wall of the hollow rod-shaped sealed container,
and a working fluid is sealed in the container, one end in the flow direction is an evaporation part, the middle part is a heat insulating part,
In a heat pipe in which the other end is a condensing part, the wick at the position of the heat insulating part is made of an elastic magnetic material in the form of a laminated wire mesh, and the heat pipe is placed at a position corresponding to the magnetic material wick on the heat pipe. A heat pipe that is provided with electric magnetic field generating means that applies a contraction force to a magnetic material radially outward.

Function In a heat pipe, condensed and liquefied working fluid accumulates in the evaporator section, and when it is heated, it evaporates.
It evaporates and passes through an insulated intermediate section, the adiabatic section, and moves to the condensing section, which has a heat load, where it absorbs heat, condenses and liquefies, and passes through the capillary action to the evaporating section again. , and here the same phase change cycle of liquid phase → gas phase → liquid phase is repeated again.

In this state, the wick at the heat insulating part of the heat pipe is made of a laminated wire mesh-like elastic magnetic material, and this magnetic material wick is provided with a gap that acts as a capillary tube.

When a magnetic force acts radially on the magnetic material wick toward the outside of the heat pipe, the density of the voids in the wick becomes the desired density, and the amount of movement of the condensed and liquefied working fluid through the wick changes depending on the degree of coarseness or density. is controlled, and as a result, an appropriate amount of heat transport is ensured.

Embodiment An embodiment of the present invention will be described with reference to the drawings (particularly FIG. 1). Reference numeral 1 is a heat pipe according to the present invention, which is a hollow rod-shaped sealed container having the following configuration.

That is, reference numeral 2 denotes a wire-mesh-like copper wick that is commonly used, and is provided on the inner wall of the heat pipe 1.

21 is another magnetic material wick, which is a wire mesh-shaped wick made of a magnetic material such as iron and laminated;
It is a constant location in the longitudinal direction of the heat pipe 1, that is, a heat insulating portion, and is provided, for example, near the center.

This magnetic material wick 21 has an appropriate gap,
These voids are made to have enough elasticity to exert a restoring force so that they can be repeatedly changed between sparse and dense states.

When a working fluid, which will be described later, passes through the magnetic material wick 21 by capillary action, the amount of passage is controlled depending on whether the gap in the magnetic material wick 21 is coarse or dense.

Reference numeral 3 denotes an electric magnetic field generating means provided outside the heat pipe 1 at a position corresponding to the magnetic material wick 21, and is composed of a winding 31.

The winding 31 is wound radially outward of the heat pipe 1 so as to exert a contraction force on the magnetic material wick 21.

That is, for example, it is wound around the outside of the heat pipe 1 in a zigzag shape at right angles to the longitudinal direction over the circumferential direction.

When a variable direct current is passed through this winding 3, a magnetic force is generated radially outward of the heat pipe, and a contraction force acts on the magnetic material wick 21 in the above direction.

4 is an evaporation section, 5 is a heat insulating section, and 6 is a condensation section, and the heat pipe 1 is filled with a working fluid 7 such as ammonia.

When the working fluid 7 is condensed and liquefied and accumulated in the evaporation section 4, it is heated by the heat source of the evaporation section 4, evaporates and vaporizes, passes through the insulation section 5, and becomes the condensation section 6.
will be transferred to.

When heat is applied to the thermal load in the condensing section 6, the working fluid 7 is condensed and liquefied, and moves through the copper wick 2 and the magnetic material wick 21 by capillary action.

When the flowing fluid 7 moves through the magnetic material wick 21, the amount of liquid passing through the magnetic material wick 21 is controlled depending on the sparseness or density of the gaps in the magnetic material wick 21, as described in part above, and as a result, the amount of liquid that accumulates in the evaporator 4 is reduced. Since the amount of evaporation is controlled, and the amount of evaporation is also controlled, the amount of heat transport is controlled to match the state of heat load.

Here, the mechanism by which the contraction force acts in the above direction will be explained using FIG. 2.

FIG. 2 is a cutaway cross-sectional view of FIG.
It is assumed that in case C, the current flows vertically toward the front side toward the paper surface, and in C, the current flows vertically toward the paper surface toward the opposite side.

At B, a counterclockwise magnetic field is generated as shown in the figure, and at C, a clockwise magnetic field is generated as shown. The size of the arrow means that the strength is proportional to the strength of the magnetic field.

At D, the magnetic forces are combined radially outward of the heat pipe 1, and a magnetic force is generated in this direction. Similarly, the size of the arrow here means the size proportional to the size of the magnetic force. On the other hand, at E, a magnetic force occurs in the opposite direction to the above, but
Since the elastic magnetic material wick 21 is attached closely to the inner wall of the heat pipe 1, it hardly stretches even if an inward tensile force is applied.

The concept is shown in which the magnetic material wick 21 receives a contracting force radially outward of the heat pipe 1 due to the above-mentioned magnetic force.

That is, a contraction force acts at F, causing the heat pipe 1 to contract outward.

A conceptual diagram of the state in which the magnetic material wick 21 is contracted is shown in FIG.

A tensile force acts at G, but as mentioned above, the magnetic material wick 21 is fixed to the inner wall of the heat pipe 1, so it is not pulled inward, and therefore the gap will not become wider than it is now. .

The state of the magnetic material wick 21 when no magnetic force acts on the magnetic material wick 21 of the heat pipe 1 is shown at K in FIG.

Next, to explain the action of the heat pipe of the present invention in more detail, for example, the winding 31
When a current with a current density of 1.5 A/mm ² flows and the working fluid 7 moves, heat transfer of 100°C occurs.
If 100°C is the overheating state and the desired heat transfer is 80°C, then if the current density is set to 2.5A/mm ² and the magnetic force is strengthened, the gap in the iron wick 21 will be narrowed and the moving flow rate of the working fluid 7 will be reduced. Since the temperature decreases, heat transfer at the desired temperature can be achieved.

The present invention is not limited to the above-mentioned embodiments, and at least the part corresponding to the winding wire may be made of iron wire mesh made of magnetic material, but other parts may also be constructed of a similar wick. Of course.

Further, the shape of the heat pipe can be either a hollow cylinder or a hollow prism, and the heat pipe can be applied to any commonly used winding wire.

Effects of the Invention As described above, according to the present invention, the wires at the heat insulating portions of the heat pipes are made of magnetic material, and the DC current of the windings provided on the outside of the heat pipes at the corresponding positions is adjusted. Therefore, by making the gaps in the heat pipe dense or coarse, the heat transfer in the heat pipe can be easily controlled over a wide range.

In addition, the magnetic material wick 21 only performs dense and coarse movements radially toward the outside of the heat pipe, but does not perform dense and coarse movements in the longitudinal direction, so repeating the dense and coarse movements makes it magnetic. There is no danger that the material wick 21 will slip off the inner wall of the heat pipe.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway sectional view of the heat pipe of the present invention. FIG. 2 is an explanatory diagram of the mechanism by which contractile force acts on the magnetic material wick 21 in the present invention. In the diagram: 1... Heat pipe, 2... Copper wick, 21... Iron wire mesh magnetic material wick, 3
...Electrical magnetic field generating means, 31...Winding, 4...
...Evaporation section, 5...Insulation section, 6...Condensation section, 7...
It is a working fluid.

Claims (1)

[Claims] 1 A heat device in which a hollow rod-shaped sealed container is provided with a wick on the inner wall, a working fluid is sealed in the container, one longitudinal end of the container serves as an evaporation section, the middle section serves as a heat insulating section, and the other end serves as a condensation section. In the pipe, the wick at the position of the heat insulating part is made of an elastic magnetic material in the form of a laminated wire mesh, and the magnetic material wick is placed on the heat pipe at a position corresponding to the magnetic material wick in a radial direction toward the outside of the heat pipe. A heat pipe that is equipped with an electric magnetic field generating means that applies a contraction force to the heat pipe.