Heat pipe

 

The invention is intended for use in heat technology, namely devices for heat transfer. The heat pipe contains partially filled with conductive liquid cooled hermetic metal case with zones of evaporation and condensation, the outer surface of which is covered with insulating material, a cap coupled to the housing in the evaporation zone and connected to a power source AC, the heater in the form of two fixed to the base electrodes, one of which is installed along the axis of the housing, and the second is connected with the metal case and the tube also contains a bellows with a rod installed in the condensation zone can be moved relative to the housing, switch power supply, connected to a rod electrode, placed along the axis of the casing and immersed in the liquid coolant, and a specified level of fill fluid “H” in the metal casing and the distance of the location of the electrode from the end of the evaporation zone “h” connected by the relation h/H=0.3 to 0.4. In addition, the power supply capacity “q” at the moment of starting of the heat pipe is selected 0,7-0,85 from power “q1” transmitted by the heat pipe, between the surface �p://img.russianpatents.com/chr/948.gif" border="0">” connected with the bellows length “l” value for/l=0.1 to 0.2. The claimed invention allows to create highly efficient transformation process heat, to ensure the reliability of the heat pipe and rational use of electricity power source. 1 C.p. f-crystals, 1 Il.

The invention relates to heat engineering, namely, devices for heat transfer.

Known heat pipe (EN 2119631, F 28 D 15/02, 1998), including partially filled with liquid conductive fluid sealed body with zones of evaporation and condensation; a cap mounted in the evaporation zone, coupled to the housing and connected to a power source; an electric heater in the form of two electrodes fixed inside the housing on the base. The power source is made on alternating current. One electrode is installed along the axis of the housing, and the second is connected with the metal housing, the outer surface of which is covered with insulating material.

The disadvantage of a heat pipe is the possibility of a violation of its work during the run of the pipe and its subsequent work with the possibility of failure. In addition, otsutstvuet.

The objective of the invention is to provide a highly efficient process of transformation of heat by increasing the reliability of the heat pipe and the rational use of electric power of the power source.

The inventive heat pipe includes a sealed metal case with zones of evaporation and condensation, partially filled with conductive liquid coolant; a base installed in the evaporation zone, coupled to the housing and connected to the power source to alternating current; an electric heater in the form of two electrodes mounted on the base. The outer surface of the housing is covered with insulating material. One of the electrodes is set along the axis of the housing, and a second electrode connected to the metal case. Unlike the prototype heat pipe includes a bellows with a rod installed in the condensation zone can be moved relative to the housing that provides the ability to move the end of the condensation zone with increasing vapour pressure of the coolant in the housing and management of the startup process heat pipe. Switch the power source is connected to a rod fixed to the bellows that provides breaking the electric circuit and disabling the IRS housing and immersed in the liquid coolant, that provides an intense heating of the heat carrier with its evaporation during a limited period of time. Given the level of fill fluid “H” in the metal casing and the distance of the location of the electrode from the end of the evaporation zone “h” connected by the relation h/H=0.3 to 0.4. The decrease in the ratio h/H<0,3 leads to the necessity of increasing the source power and the time for transfer of fluid into a vapor. The increase in the ratio h/H>0,4 does not provide, in some cases, the filling body heat pipe steam to a set pressure by reason of an exposed electrode, and thus there is more inefficient energy consumption for evaporation of the coolant and the increase in vapor pressure in the housing. The power supply capacity “q” at the moment of starting of the heat pipe is 0,7-0,85 from power “q1” transmitted by the pipe. Choosing a power supply “q” at the moment of starting of the heat pipe relative to the power transferred by the heat pipe “q1” that is determined by the following factors. The decrease in the ratio q/q1<0,7 increases the warm-up time body heat pipe with a heat transfer medium and the time of its launch. The increase in the ratio q/q1>0,85 leads in some cases the security and malfunction. Between the surface of the bellows and the insulating material is made of the gap. The gap in the front-end part of the bellows “” connected with the bellows length “l” value for/l=0.1 to 0.2. Increase (decrease) of clearance between the surface of the bellows and the insulating material provides the possibility of increasing (decreasing) the volume of the bellows when the increase (decrease) in vapour pressure of the fluid in the housing. The decrease in the ratio of/l<0,1 complicates the work of the bellows at elevated vapor pressures of the coolant with the possibility of damage to the insulating material and the housing. The magnification ratio/l<0,2 leads to unsustainable increase in the length of the entire heat pipe and rod attached to the bellows.

The invention is illustrated in the drawing, which shows an external view of the inventive heat pipe.

A heat pipe consists of a housing 1 with the evaporation zone 2, carrier 3, the condensation zone 4, cap 5 connected to the housing 1, the heater electrodes 6 and 7, the insulating material 8, the bellows 9 and rod 10, the contacts 11, the power source 12, a current sensor 13.

< AC electric current from the source 12 when closed contacts 11 to the heater electrodes 6 and 7, fixed to the body 1 and the cap 5. Include the current sensor 13. When electric current flows through the coolant 3 is his warm-up with evaporation in the zone 2. Forming a pair of fluid fill the entire volume inside the housing 1 with the condensation zone 4 and the bellows 9. Upon reaching a predetermined temperature vapor of the carrier 3 and the pressure in the housing 1, the volume of the bellows 9 is increased with simultaneous movement of the rod 10 and the opening of the contacts 11. The current sensor 13 is turned off. Insulating material 8 protects the heat pipe when it is up against leakage of electric current through the body 1. After heating heat pipe it performs its functions for the transformation of heat transferred from the external environment through the walls of the housing 1 in the evaporation zone 2 in the condensation zone 4 vapor of the coolant and the exhaust heat from the outer surface of the housing 1 through the layer of insulating material 8. Formed by condensation of the vapor of the coolant in the condensation zone 4, the condensate flows down the inner surface of the housing 1 in the evaporation zone 2 with the formation of a closed evaporating-condensing cycle and heat transfer.

Claims

1. Heat pipe containing a partially filled the, the outer surface of which is covered with insulating material, a cap coupled to the housing in the evaporation zone and connected to a power source AC, the heater in the form of two fixed to the base electrodes, one of which is installed along the axis of the housing, and the second is connected with the metal housing, characterized in that it contains a bellows with a rod installed in the condensation zone can be moved relative to the housing, switch power supply, connected to a rod electrode placed along the axis of the casing and immersed in the liquid coolant, moreover, given the level of fill fluid N in the metal casing and the distance of the location of the electrode from the end of the evaporation zone h are related by the ratio h/H=0.3 to 0.4.

2. Heat pipe under item 1, characterized in that the power supply capacity q at the moment of starting of the heat pipe is selected 0,7-0,85 power q1transmitted by the heat pipe, between the surfaces of the bellows and the insulating material is made of the gap, the value of which in the end part of the bellowsconnected with the bellows length l ratio/l=0.1 to 0.2.



 

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