SU970073A1 - Adjusted heat pipe - Google Patents

Description

This invention relates to heat transfer devices.

Known heat pipe containing fins on the outer surface of the housing in the condensation zone 11.

The disadvantages of this pipe are the relatively low intensity of external heat exchange, due to the stagnant zones between the fins, and the impossibility of its regulation.

The closest technical ryo (and to the proposed is an adjustable heat pipe, containing; a cylindrical housing with evaporation and condensation zones, outside the last of which are longitudinal ribs and discharge electrodes connected to the high voltage source TOKat2.

The disadvantage of the known pipe is a comparatively narrow area of its application, due to the small range of regulation, which is associated with the unilateral effect of corona discharge on the intensity of heat exchange, which can only be increased compared to natural convection, but cannot be reduced.

The purpose of the invention is the expansion of the area with:

This goal is achieved by the fact that the ribs are made in the form of hollow cylinders, and the corona electrodes are mounted along the axis of each cylinder on the side of its ends opposite one another.

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Moreover, in order to improve the accuracy of adjusting the ribs, the outside is covered with a layer of thermal insulation.

FIG. 1 schematically shows f. heat pipe, longitudinal section (one embodiment); Fig. 2 is the same, the cross section in the rib region (another embodiment):

The adjustable heat pipe contains a cylindrical body 1 with zones 20 and 2 and 3 of evaporation and condensation, respectively, and longitudinal ribs 4 placed outside the body 1 in zone 3 of condensation, made in the form of hollow cylinders. Each axis

25 cylinders on the side of its ends opposite one another are installed corona electrodes 5 connected to a high voltage source 6 of current. Inside one of the cylinders placed

30 a resistance thermometer 7 connected to a control unit 8, to which the current source 6 is also connected. Outside, the ribs 4 are covered with a heat insulating layer 9.

Electrodes 5 are fixed on dielectric bushings 10, which in one of the embodiments of the pipe are adjacent to the ends of the fins 4 (Fig.), and in another embodiment are installed in the thermal insulation layer 9 (Fig.2).

regulated heat pipe works as follows.

The heat supply and heat removal in zones 2: and 3 evaporation and condensation, respectively, through the pipe, is carried out by heat and mass transfer with a change in the aggregate state of the coolant. Regulation of heat exchange inactivity between the ribs 4 and the surrounding air (air) is achieved by varying the high voltage applied to the corona eyektrody 5. If it is necessary to increase the intensity, heat transfer of the voltage is applied to the bottom of the electrodes 5. In this case, the electric convection arising inside the fins 4 is folded with natural convection. When voltage is applied to the upper electrodes 5, electroconvection prevents natural convection, as a result of which the heat exchange intensity decreases.

Thermal insulation 9 reduces the unregulated heat flux from the outer surface of the fins 4 to the surrounding gas and thereby contributes to an increase in the accuracy of regulation. The presence of feedback between the resistance thermometer 7, the control unit, 8 of the control and the current source b allows the heat exchange intensity to be controlled with great accuracy.

Thus, the implementation of the longitudinal ribs 4 in the form of hollow cylinders with counter corona electrodes 5 mounted on their ends allows the use of an adjustable heat pipe to be expanded.

Claims (2)

1. Adjustable heat pipe containing a cylindrical body with evaporation and condensation zones, the longitudinal ribs and corona electrodes, connected to a high-voltage current source, are located outside the terminal, which in order to expand the field of application, the ribs are made in the form of hollow cylinders, and the corona electrodes are installed on the axis of each cylinder from the side of its ends to the opposite one. 2. Pipe POP.1, characterized in that, in order to improve the accuracy of regulation, the fins on the outside are covered with a layer of thermal insulation . Sources of information taken into account in the examination 1. Dan P., Rhine D. Heat pipes; m., Energie, 1979. p. 1882. 2. USSR author's certificate number 699313, cl. F 28 D 15/00, 1977.