High temperature heat pipe

 

The invention is intended for use in heat technology, namely devices for heat transfer. High temperature heat pipe contains partially filled with fluid sealed body with zones of evaporation and condensation, is made of a dielectric material with a tightly fitted to the outside of the protective metal casing; a cap attached to the housing with the end of the evaporation zone, which inside fixed the heater in the form of a pair of electrodes made of plates made of electroresistance material and installed parallel to each other and perpendicular to the axis of the housing; a power electrode, made with alternating current; a carrier made of electrically conductive material; the housing end face in the condensation zone is installed sealing tube, on the end of which is fixed container with a getter, moreover, as the dielectric material selected ceramics, on the inner surface which is in contact with the fluid, caused by a layer of refractory metal, for example tungsten, is compatible with pairs of fluid, a sealed enclosure filled with fluid in the solid state, the electrodes are installed in theplanetary bound by the ratio h/H is 0.65-0.75. In addition, a heat pipe is provided with a level sensor coolant in the housing, for example, in the form of a resistance sensor current between the electrodes and the system of automatic control of the heat and work heat pipe. The claimed invention allows to create a highly efficient device for transferring heat by increasing reliability and service life of the heat pipe and to provide the ability to control the start of the heat pipe and control its operation. 1 C.p. f-crystals, 1 Il.

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

Known heat pipe (EN 2095717, F 28 D 15/02, 1997), containing partially filled with liquid conductive fluid sealed body with zones of evaporation and condensation and the getter container in the zone of condensation inside the enclosure. The housing end in the evaporation zone is equipped with a mounting base on which the inside fixed the heater in the form of a pair of electrodes. The carrier is made of electrically conductive material. The electrodes are designed in the form of plates of electroresistance material and are mounted parallel to each other perpendicular to the axis of the housing, the power electrode protective metal casing, the heat pipe is configured to seal her in the process of degassing from the end face in the condensation zone of the sealing tube, on the end of which is fixed container with a getter.

The disadvantage of a heat pipe is the lack of information about the location of the electrodes and their connection with the fill level of the coolant in the housing. In addition, the lack of information about the heating heat pipe operating temperature complicates its operation.

The objective of the invention is to provide a highly efficient device for transferring heat by increasing reliability and service life of the heat pipe and the ability to control the start of the heat pipe and control its operation.

The invention consists in the following. The inventive high-temperature heat pipe includes a sealed body with zones of evaporation and condensation, partially filled with fluid; and the body is made of a dielectric material with a tightly fitted to the outside of the protective metal casing. A cap fixed to the body from the end of the evaporation zone; on the base inside the housing fixed the heater in the form of a pair of electrodes; the electrodes are made in the form of plates of electroresistance mA alternating current. The carrier is made of electrically conductive material. High temperature heat pipe is configured to seal her in the process of degassing from the end face in the condensation zone of the sealing tube. At the end of the sealing tube is fixed container with a getter. Unlike the prototype as a dielectric material selected ceramics; on the inner surface of the ceramic in contact with the fluid, caused by a layer of refractory metal, for example tungsten, is compatible with pairs of the carrier; the sealed enclosure filled with fluid in the solid state; the electrodes are mounted in the carrier; the depth of the upper electrode “h” in the coolant and the level of fill of liquid coolant “H” in the case related by the ratio h/H=0,65-0,75; sensor fluid level in the casing is in the form of a resistance sensor current between the electrodes. The device is equipped with a system of automatic control of the heat and work heat pipe.

The choice of the dielectric material of the ceramic body provides long-term operation of the inventive heat pipe at elevated temperatures without failure. In addition, it simplifies the technology of izgotovleni with coolant, a layer of refractory metal, for example tungsten, is compatible with pairs of fluid, eliminates the direct chemical interaction of the ceramic body heat pipes at high temperature with the coolant and greatly increases the life of the pipe. Filling the hermetic casing of the heat pipe under normal conditions the fluid in the solid state, for example lithium, sodium, lead, and others, significantly extends the operating temperature range of the heat pipe as compared with the liquid coolant, for example water. The establishment of the electrodes in the coolant provides the opportunity for intensive heating to a liquid state by evaporation and boiling, and also reduces the startup time of the heat pipes and the possibility of regulation passed by the pipe of the heat flux over a wide range. The decrease in the ratio h/H<0,65 (where “h” is the depth of the upper electrode in the carrier, “H” - level of fill of the liquid coolant in the housing does not provide in some cases achieve a desired vapor pressure of the fluid in the housing. There is a necessity of additional time and energy to warm up with the launch of the heat pipe due to oganisee level of fill of the coolant in the housing, what complicates the arrangement of the electrodes in the housing parallel to each other and perpendicular to the axis of the housing. On the other hand, when the level increases, the fill fluid “H” and increase the depth of the upper electrode “h” in the coolant increases thermal resistance of the heat transfer in the evaporation zone, increases the time and the energy consumption on heating up with the launch of the heat pipe. The presence sensor fluid level in the housing, for example in the form of a resistance sensor current between the electrodes, allows the startup control heat pipe and its operation when immersed in the liquid coolant electrodes, and allows you to control the possibility of seal failure heat pipe coolant leakage. A system of automatic control of heat and work heat pipe provides a smooth transition from the process of the heat pipe to the heat transfer process pipe in the system, as well as in a timely manner to stop the supply of heat to the evaporation zone of the heat pipe is controlled by sensor resistance current between the electrodes.

The claimed invention is illustrated in the drawing, which presents the appearance of the claimed viscotemp 1 evaporation zones 2 and condenser 3; protective metal casing 4; the cap 5 with the heater 6 in the form of electrodes 7 and 8, made of wafers; sealing the tube 9; container 10 with getter; the resistance sensor current 11 between the electrodes with the automatic control system; AC 12; coolant 13 in contact with the layer of refractory metal 14 on the body surface.

Before working heat pipe is carried out by warming up when the AC power source 12. When electric current flows between the electrodes 7 and 8 of the heater 6, is fixed on the base 5, the housing 1 is heated heat carrier 13 with its melting and evaporation in zone 2. Forming a pair of fluid fill the entire volume of the housing 1 with the condensation zone 3, from the interaction with the case protects the layer of refractory metal 14. When changing the level of the coolant 13 in the process of evaporation changes the resistance of the current between the electrodes 7 and 8, which is controlled by the resistance sensor current 11 and when the preset value of the automatic control system is disconnecting the AC power source 12. Metal case 4 protects the ceramic body 1 from damage. Formed in the process th obce 9. After heating heat pipe is carried out her work with the transformation of heat from the evaporation zone 2 in the condensation zone 3 while cooling the outer surface of the housing 1 with the protective metal casing 4.

Claims

1. High temperature heat pipe containing partially filled with fluid sealed body with zones of evaporation and condensation, is made of a dielectric material with a tightly fitted to the outside of the protective metal casing; a cap attached to the housing with the end of the evaporation zone, which inside fixed the heater in the form of a pair of electrodes made of plates made of electroresistance material and installed parallel to each other and perpendicular to the axis of the housing; a power electrode, made with alternating current; a carrier made of electrically conductive material; the housing end face in the condensation zone is installed sealing tube, at the end of which is fixed container with a getter, characterized in that the dielectric material is selected ceramics, on the inner surface which is in contact with the fluid, caused by a layer of refractory metal is enom condition, the electrodes are installed in the coolant, the depth of the upper electrode h in the coolant and the level of fill of liquid coolant H in the casing connected by the relation h/H=0,65-0,75.

2. High temperature heat pipe under item 1, characterized in that it is provided with a level sensor in the coolant housing, for example in the form of a resistance sensor current between the electrodes and the system of automatic control of the heat and work heat pipe.



 

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