JPH0330714Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a device that transports heat as latent heat by evaporating and flowing a liquid, and is a technology related to heat pipes.

Prior Art A heat pipe is conventionally known as this type of device.A heat pipe is a sealed tube that has exhausted a non-condensable fluid such as air, and a working fluid that exhibits condensability such as water is sealed inside it. , metal mesh or narrow grooves,
The basic structure is that a capillary pressure such as an ultrafine wire is provided inside the sealed tube. The working fluid is evaporated by the heat applied to one end of the heat pipe, and the vapor flows to the other end of the heat pipe and is condensed by heat radiation, thereby transporting heat as latent heat of the working fluid. Capillary pressure is generated by the evaporation of the working fluid, so that the condensed and liquefied working fluid flows back inside the wick to the end where the evaporation occurred.

However, the capillary pressure for refluxing the liquid-phase working fluid can be increased by making the capillary a microporous structure and making the effective capillary radius on its surface as small as possible. In this case, porous sintered metal generates a considerably high capillary pressure, but even then, the capillary pressure obtained is about 30 to 80 cm in terms of water head. Therefore, even if the heat pipe is made of porous sintered metal, if the high temperature part is located higher than the low temperature part, i.e. in the top heat mode where the evaporation part is set higher than the condensation part, the height difference will be If the pressure is higher than that, the liquid-phase working fluid will no longer flow back to the evaporator, and as a result, heat transport will no longer be possible. Also, since the liquid phase working fluid flows back to the evaporation section through the internal space of the wick,
When a capillary with a finer pore structure is used to increase the capillary pressure, the flow resistance to the liquid-phase working fluid increases, making it difficult for the liquid-phase working fluid to return to the evaporator, and ultimately reducing the heat transport capacity. There is a problem that can lead to a decrease in

Purpose of the invention This invention was made in view of the above-mentioned circumstances, and the object thereof is to provide a heat transport device with excellent return characteristics to the evaporation section of the fluid directly used for heat transport.

Structure and operation of the device This device seals a magnetic fluid in which a dispersion medium is a liquid that evaporates by heating and condenses by cooling inside a sealed tube from which a non-condensable fluid such as air is evacuated.
A liquid reservoir is formed at one end of the sealed tube, the liquid reservoir and the other end of the sealed tube are communicated through a bypass tube made of a non-magnetic material, and the sealed tube of the bypass tube is connected to the other end of the sealed tube. A coil that generates a stronger magnetic field toward the other end is provided in the bypass tube, and a spiral groove is provided to distribute the magnetic fluid fed through the bypass tube over the entire inner circumference of the other end of the sealed tube. This structure is formed on the inner peripheral surface of the other end of the sealed tube, so that the magnetic fluid, which transports heat by evaporation, is transferred from the liquid reservoir to the other end of the sealed tube by magnetic force. It is made to flow and is supplied to the entire inner periphery of the other end of the closed tube where heat is input from the outside.

Embodiments Hereinafter, embodiments of this invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic diagram showing an embodiment of this invention, in which a sealed tube 1 as a main body is filled with a magnetic fluid 2 as a working fluid after a non-condensable fluid such as air is evacuated. The magnetic fluid 2
A liquid reservoir 3 for temporarily storing the magnetic fluid 2 is formed at the lower end of the sealed tube 1, and a spiral groove G is formed on the inner surface of the upper end of the sealed tube 1 for distributing the magnetic fluid 2 over the entire inner peripheral surface. is formed. Here, the magnetic fluid 2 is a colloidal solution in which fine particles of magnetite or ferrite with a diameter of about 100 Å are suspended in a dispersion medium exhibiting condensability such as water or an organic solvent. The liquid reservoir 3 and the upper end of the sealed tube 1 having a spiral groove are communicated with each other by a bypass tube 4 arranged parallel to the sealed tube 1. It extends from the reservoir 3 to the upper end of the sealed tube 1, is made of a non-magnetic material, and is provided with a coil 5 on its outer periphery for generating a DC magnetic field. The coil 5 is connected to a power source 6, and is configured to generate a magnetic field with a gradient that becomes stronger toward the upper end of the bypass pipe 4 when energized. The upper end of the bypass pipe 4 is set at a higher position than the upper end of the sealed tube 1 in order to cause the magnetic fluid 2 to flow down from the inside thereof to the upper end of the sealed tube 1.

Therefore, by energizing the coil 5, a magnetic field H having a gradient as shown in FIG. If it is installed in a cooling section and set to remove heat Q, the magnetic fluid 2 using a condensable liquid as a dispersion medium will direct the inside of the bypass pipe 4 toward its upper end by magnetic force. The magnetic fluid 2 rises and flows down from the upper end of the bypass pipe 4 to the upper end of the sealed pipe 1 . In that case, since the spiral groove G is formed on the inner circumferential surface of the upper end of the sealed tube 1, the magnetic fluid 2 flowing out from the bypass tube 4 is dispersed over the entire inner circumferential surface of the sealed tube 1 by the spiral groove G. The magnetic fluid 2 is supplied as a magnetic fluid and reaches the upper end of the sealed tube 1. The magnetic fluid 2 receives heat Q and its dispersion medium evaporates. The vapor flows to the lower end of the sealed tube 1 where the vapor pressure is low, and is deprived of heat Q near the liquid reservoir 3 to condense and liquefy. In that case, the condensable dispersion medium absorbs the latent heat of vaporization when it evaporates, and releases the latent heat when it condenses and liquefies. Heat Q can be transported from the ground to a lower temperature area. Furthermore, in the above device, since the bypass pipe 4 having a relatively large diameter is the flow path for the magnetic fluid 2, the flow resistance to the magnetic fluid can be reduced.

Effects of the invention As is clear from the above explanation, this invention has the following advantages:
In addition to enclosing a magnetic fluid in which a dispersion medium is a liquid that evaporates by heating and condenses by cooling, a liquid reservoir is formed at one end of the sealed tube, and the liquid reservoir and the other end of the sealed tube are made of non-magnetic material. A coil is provided in the bypass pipe, which communicates with the other end of the bypass pipe and generates a stronger magnetic field toward the other end of the sealed pipe. Since spiral grooves are formed on at least the inner circumferential surface of the upper end of the sealed tube to distribute the spiral grooves over the entire inner circumferential surface, the magnetic fluid that is directly used for heat transport can be raised to a considerably high position by magnetic force. Therefore, even if the high-temperature part is located higher than the low-temperature part, that is, even in top heat mode, heat can be reliably transported, and the inside of a bypass pipe with a large diameter can be easily transferred. Because the magnetic fluid flows, it is possible to prevent a decrease in heat transport ability due to an increase in flow resistance to the liquid that is directly provided for heat transport.Furthermore, the magnetic fluid spreads widely due to the spiral grooves and can be used in sealed tubes. Since the magnetic fluid flows down the inner surface of the magnetic fluid, the heat transfer area for the magnetic fluid becomes larger, promoting its evaporation, and accordingly, excellent practical effects such as improved thermal efficiency can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of this invention. 1... Sealed tube, 2... Magnetic fluid, 3... Liquid reservoir, 4... Bypass pipe, 5... Coil, G... Spiral groove.

Claims (1)

[Scope of utility model registration request] A magnetic fluid with a dispersion medium of a liquid that evaporates by heating and condenses by cooling is sealed inside a sealed tube from which a non-condensable fluid such as air has been exhausted, and a liquid reservoir is formed at one end of the sealed tube, One end of a bypass pipe made of a non-magnetic material is opened to the liquid reservoir, and the other end of the bypass pipe is opened to the inner surface of the other end of the sealed pipe. A coil having a spiral groove formed on the inner circumferential surface of at least the other end of the circumferential surface, and further generating a stronger magnetic field toward the other end of the sealed tube of the bypass pipe,
A heat transport device installed in a bypass pipe.