Heat pipe

FIELD: heat power engineering.

SUBSTANCE: heat pipe comprises vertical housing with evaporation and condensation zones and partially filled with heat-transfer agent and coaxial hollow insert in the evaporation zone which defines a ring space with the housing and is provided with outer fining. An additional hollow cylindrical insert of variable radius made of a non-heat-conducting material is interposed between the condensation zone and coaxial hollow insert. The outer side of the additional insert and inner side of the housing of the heat pipe define a closed space.

EFFECT: reduced metal consumption.

1 dwg

 

The invention relates to heat engineering and can be used for cooling or thermal stabilization of different devices, mainly in the field of underground construction, mining, and relates to the freezing of the soil to create Leopardi fences.

Known heat pipe comprising a vertical body with zones of evaporation and condensation, partially filled with fluid, and a coaxial hollow insert in the evaporation zone, forming with the casing an annular gap and is provided with external fins [1].

A disadvantage of the known pipe is a low level of heat in the evaporation zone.

Closest to the claimed invention is a heat pipe comprising a vertical body with zones of evaporation and condensation, partially filled with fluid, and a coaxial hollow insert in the evaporation zone, forming with the casing an annular gap and provided with an outer fins, the latter is in the form of transverse annular projections on the insert, and the gap has multiple speed-changing cross-section [2].

A disadvantage of the known pipe is unguaranteed wetting liquid surface evaporation zone. In addition, if necessary, dosage (local) freezing, especially at great depths, no zone of Transporter the project leads to a sharp increase of the condensation zone of the heat pipe, that increases the intensity of the heat pipe.

Object of the invention is the provision of opportunities for local freezing of the soil, including at a great depth, as well as the reduction of metal heat pipe.

This object is achieved in a heat pipe, comprising a vertical body with zones of evaporation and condensation, partially filled with fluid, and a coaxial hollow insert in the evaporation zone, forming with the casing an annular gap and is provided with external fins, and according to the invention between the condensation zone and a coaxial hollow insert installed additional hollow insert of metalloproteinase material of cylindrical shape with a variable radius, forming its outer surface and the inner wall of the housing of the heat pipe is a closed space, and is the ratio of:

dmin DPV<dCPU,

where dmin DPV- the minimum diameter of the additional hollow insert;

dCPU- diameter coaxial hollow insert.

The drawing shows the proposed heat pipe, General view.

The heat pipe includes a housing 1 with the evaporation zones 2 and condenser 3, partially filled with fluid, and a coaxial hollow box 4, forming with the housing 1 an annular gap 5, and provided with an outer fins 6, executed the form of annular projections. While the gap 5 has a multiple speed varying cross-section. The insert 4 may be made in the form of a corrugated tube. Additional hollow insert 7 from metaloproteinase material of cylindrical shape with a variable radius forms its outer surface and the housing 1 heat pipe is a closed space 9. Variable radius additional hollow insert 7 is designed in such a way as to ensure separation of the flow from the inner surface of the additional hollow insert 7 and the falling drops due to gravitational forces on the inner surface of the coaxial cavity insert 4 in the evaporation zone. This condition will be executed in that case, if the minimum diameter of the additional hollow insert 7 is less than the diameter of the coaxial hollow insert.

dmin DPV<dCPU,

where dmin DPV- the minimum diameter of the additional hollow insert;

dCPU- diameter coaxial hollow insert.

The proposed heat pipe operates as follows.

While applying heat to the evaporation zone 2 coolant boils and pair him with an annular gap 5 rise in the condensation zone 3. The fluid moves along the inner surface of the additional insert 7 to the separation point 8, and then in the form of droplets flows into the internal cavity of the insert 4, without any contact with vnutrennepolytycheskoy additional insert 7 after isolation from point 8. The cavity 9 formed by the outer surface of the additional hollow insert 7 and the casing of the heat pipe, has a high thermal resistance in the radial direction, resulting in the reduction of heat flux between the soil in the area of transportation, heat pipes and a pair of coolant. In addition, due to the transfer of part of the evaporation zone in the area of transportation reduces the heat load on the condensation zone and, consequently, decreases the intensity of the condensation zone and the entire heat pipe as a whole. After condensation in zone 3, the coolant again through additional box 7 is returned into the internal cavity of the insert 4.

Thus, the invention allows to freeze the ground to a great depth locally and sustainably to work at small angles of inclination of the heat pipe to the horizon, as well as reduce the intensity of the heat pipe due to the transfer of part of the evaporation zone in the area of transportation.

Sources of information

1. USSR author's certificate No. 566117, CL F 28 D 15/00.

2. USSR author's certificate No. 1108322, CL F 28 D 15/00.

A heat pipe comprising a vertical body with zones of evaporation and condensation, partially filled with fluid, and a coaxial hollow insert in the evaporation zone, forming with the casing an annular gap and provided with an outer Gabrini is m, characterized in that between the condensation zone and a coaxial hollow insert installed additional hollow insert of metalloproteinase material of cylindrical shape with a variable radius, forming its outer surface and the inner wall of the housing of the heat pipe is a closed space, and is the ratio of the dmin DPV<dCPUwhere dmin DPV- the minimum diameter of the additional hollow insert; dCPU- diameter coaxial hollow insert.



 

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