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Technology for production of heat pipe based on process of pressing one material complex

晨怡热管 2009-1-26 14:21:44

A Bulgarian institute offers a new technology for production of heat pipes (HP). By process of pressing a complex billet containing metal and non metal materials there are simultaneously producing the different components of a HP - the body and the wick. When in solid physical state, the coolant of HP is used as an active formative material and it is implanted and distributed in the wick thus eliminating its additional introduction. The institute offers license agreement, joint venture etc.

Heat pipes employ to transfer thermal energy from one point to another by the evaporation and condensation of a working fluid or coolant. A heat pipe is essentially a passive heat transfer device with an extremely high effective thermal conductivity. The two-phase heat transfer mechanism results in heat transfer capabilities from one hundred to several thousand times that of an equivalent piece of copper. A heat pipe in its simplest configuration is a closed, evacuated cylindrical vessel with the internal walls lined with a capillary structure or wick that is saturated with a working fluid. As heat is input at the evaporator, fluid is vaporised, creating a pressure gradient in the pipe. This pressure gradient forces the vapour to flow along the pipe to a cooler section where it condenses transferring its latent heat of vaporisation. Internally, in order to overcome gravitational forces (or because of their absence in the case of space applications) most heat pipes contain a wick structure. The working fluid is then returned to the evaporator by the capillary forces developed in the wick structure. Innovative Aspects: Unlike the currently available technologies for production of HP where the components of HP (body and wick) are made separately and then assembled, the development by the Bulgarian Institute technology starts from a complex initial billet which contains in itself different materials and by pressing process simultaneously forms the body and the wick. A bar of tube type is produced containing the body, wick and heat transferring medium with parameters corresponding to finished HP. Pieces of the length of the HP are cut from this bar and for the accomplishment of the final product it is only necessary to install the bottoms and to vacuum it. One of the characteristic features of this new technology is that in the pressing process the heat transferring medium, which could be metal or non metal and is obligatory in solid physical condition, is used as active deforming medium and remains inside the wick after its pressing thus eliminating the necessity for further operation of its introduction. If the heat transferring medium has no the suitable physical and mechanical properties to be used in the described manner, other appropriate material is used, which should be taken out of the wick by melting or dissolution. In that case it is necessary for the required operation heat transferring medium to be additionally led into the tube. The realisation of this concept is connected with the use of a know-how technology of pressing where super high deformation rates are realised as well as with new results of examination of the mechanical behaviour of composites in the plastic area. Main Advantages: The production time is cut down significantly.

The production costs are lower than the ones of the known technologies for the production of heat pipes.

The technology allows production of heat pipes with big length.

When the heat transferring medium is in solid physical state at room temperature it may be implanted in the process of the production of the heat pipe.

The technology provides the possibility together with the wick structure an arterial one to be also formed at high variety of the design parameters.

The application aspect of this concept is combined with the scientific research in the field of the behaviour mechanics of complex composites in the plastic area which unlike the elastic one is not enough explored. There are results that provide the basis to suggest realisation of additional positive effect of the development of knowledge in this field.

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