Cylindrical cooler

FIELD: heat exchange.

SUBSTANCE: cylindrical cooler comprises solid radiator made of an alloy with shape memory effect. The radiator is shaped into a cylinder. The cylinder is preliminary rolled with respect to the axis of rotation in the thermoplastic region by an angle close to the limit one. At a critical temperature, the cylinder is unrolled. The cylindrical shape of the radiator is recovered under the action of thermoelastic force. When the temperature of the cylinder exceeds the critical temperature, the cylinder cools and absorbs the excess of heat.

EFFECT: enhanced efficiency.

 

Know the use of devices related to the field of engineering, namely, devices for cooling and protection of the elemental base of electronic equipment, including a microprocessor, as well as parts and components of machines, based on the heat transfer from the equipment through solid heat sinks, natural evaporation of the working fluid, forced liquid or air cooling [1, 2].

Known cooling device, based on the use of an alloy with shape memory effect with a significant Exo - and endothermal effects at cooling and heating in the range of martensitic transformations [3, 4].

The prototype of the proposed device is a cooling device containing a solid radiator, recruited from a number of profiled plates are made of an alloy with shape memory effect. The plate initially have non-closed cylindrical shape, nested into each other and fixed equidistant through a series of rings and retainer cap on the cooled object or whip the last bracket inside an open cylindrical plates, alloy have a phase transformation at the design temperature in a rectangular U-shaped form, with certain geometric proportions of the heights and bases of the plates.

The disadvantages of the prototype ablauts the low cooling efficiency especially, if necessary, removal of a large amount of heat from the equipment elements, low operational characteristics due to a significant increase in the useful volume of the device when changing the form of profiled plates.

At the same time, in the technique often need high reliability cooling equipment contained limited amounts, not allowing spatial movement radiator cooling devices, with a significant temporary increase in temperature. This task can be solved as follows.

The cooling device contains solid heatsink, made of alloy with shape memory effect, the radiator is made in the form of a cylinder connected to one of the grounds with the surface of the cooled object and secured on the spring bracket, cylinder initially twisted about the axis of rotation in the plastic region of deformation at a certain angle, close to the limit, the alloy of the cylinder is set to a phase transformation at a critical temperature promoted a cylindrical shape with geometric proportions of the diameter and height of the cylinder, respectively, calculated by D=L and N=4Q/πρcD2(T2-T1), where L is the characteristic size of the surface of the cooled object; Q is the amount of exhaust heat is you; ρ - density alloy, C - specific heat of the alloy; (T2-T1) - change of temperature resulting from removal from the cooled object of a quantity of heat.

The essence of the proposed device cooling is illustrated by drawings, where figure 1 shows a cooling device for cooling an object, figure 2 is a view of A.

The cooling device contains solid heatsink, made of alloy with shape memory effect, the radiator is made in the form of a cylinder 1 connected to one of the grounds with the surface of the cooled object 2 and secured on the spring bracket 3, the cylinder 1 is initially twisted about the axis of rotation in the plastic region of deformation at a certain angle, close to the limit. The surface between the cylinder 1 and a cooled object 2 is filled thermoprotei grease 4.

The cylinder 1 made of an alloy with shape memory effect known methods [3, 5], set the phase transformation at a critical temperature promoted a cylindrical shape with geometric proportions of the diameter and height of the cylinder, respectively, calculated as specified above dependencies.

The cooling device operates as follows: in normal operation mode when the temperature is below the value of the start phase transition (critical) cooler liability what about with an estimated intensity of heat removal from the cooled object 2, for example from a piece of electronic equipment.

When exposed to solid state heat sink has a cylindrical shape and actually cooled the object of considerable heat load exceeding the calculated cylinder 1 is heated to the critical temperature of the beginning of phase transformations in the material. In addition, the material of the cylinder 1 undergoes a phase transformation and changes its shape, i.e. unwound. Heating the cooled object 2 is carried out to a temperature at which there is a restoration of the cylindrical radiator. For the alloy with shape memory effect based systems, for example, Ni-Ti, the temperature for the most stable results, recovery is from 100 to 200°and can be selected and set depending on the temperature ranges of the alleged overheating [3, 5].

Restore the cylindrical shape of the heat sink is provided by the power thermoelastic alloy. The maximum thermal effect (in this case, cooling) dT=dHp/C is determined by the enthalpy dHpand heat capacity of the alloy and makes for a thermoelastic transformation of several tens of degrees [3]. The cylinder 1 when overheated above the critical temperature cools and becomes runoff of excess thermal energy.

Naturally, the cooling device mode termoreg the ablation may work for a limited time, absorbing quite certain amount of heat. The "capacity" of the cylinder, which is the flow of heat is proportional to the amount of material and can be chosen in accordance with the alleged overheating.

The device is effective for the intended pulse or emergency overheating, for example, structural elements of the electronic equipment operating in extreme conditions a short time, during which will be provided with the required temperature or the operational reserve time for the necessary switching equipment.

After operation of the proposed cooling device remains in a constant external form and passively removes heat from the object.

Labels unwinding angle on the ends of the cylinder can serve as an indicator for the staff about the fact overheating, which can effectively reduce accidents, especially in aircraft and other vehicles that do not have constant temperature control.

The positive effect of the invention is to improve cooling efficiency, especially when the removal of a large amount of heat from the equipment elements, and improve the performance of heat dissipation due to the same outer shape of the cooling unit and the possibility of indicating to the staff about the emergency actuation in which trojstva. The positive effect is due to the use as a working fluid cooler cylindrical radiator with specified geometric proportions and form, thereby protecting the object from thermal loads.

This cooling device is different from the prototype of an improved design that provides more effective protection of items of equipment in extreme thermal conditions, such as failures of forced cooling or high temperatures in a confined space, and sufficient resistance to aggressive media.

Sources of information

1. Microelectronic device automation. Textbook for high schools/ STB, Ajuluchuku, Vchicles and others /edited STA): Energoizdat, 1991 -384 S.: ill.

2. Microprocessors. 3 kN. Vol.2. connectivity tools. Control and information management systems. Ed. Linphone - M.: Higher school, 1986.

3. The shape memory effect in alloys: TRANS. from English. Lamberston / edited Vasilevskogo - M.: metallurgy, 1979-472 C.

4. RF patent №22428447 NV 7/20.

5. Kostoglotov A.I. Denisov, O., Stupakov VA, Shevtsova, L.A. Experimental study of mechanical properties of titanium-Nickel alloy with shape memory effect at elevated temperatures and plastic torsion, " Izv. Higher education institutions. The natural Sciences. No. 4, 1999. - P.24-26

The cooling device containing a solid heatsink, made of alloy with shape memory effect, wherein the heat sink is made in the form of a cylinder connected to one of the grounds with the surface of the cooled object and secured on the spring bracket, cylinder initially twisted about the axis of rotation in the plastic region of deformation at a certain angle, close to the limit, the alloy of the cylinder is set to a phase transformation at a critical temperature promoted a cylindrical shape with geometric proportions of the diameter and height of the cylinder, respectively, calculated by D=L and H=4Q/πρcD2(T2-T1), where L is the characteristic size of the surface of the cooled object; Q is the amount of exhaust heat; ρ - density alloy, C - specific heat of the alloy; (T2-T1) - change of temperature resulting from removal from the cooled object of a quantity of heat.



 

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FIELD: heat exchange.

SUBSTANCE: cylindrical cooler comprises solid radiator made of an alloy with shape memory effect. The radiator is shaped into a cylinder. The cylinder is preliminary rolled with respect to the axis of rotation in the thermoplastic region by an angle close to the limit one. At a critical temperature, the cylinder is unrolled. The cylindrical shape of the radiator is recovered under the action of thermoelastic force. When the temperature of the cylinder exceeds the critical temperature, the cylinder cools and absorbs the excess of heat.

EFFECT: enhanced efficiency.

FIELD: power industry.

SUBSTANCE: plated element for heat exchanger includes core material and one or more layers of side material laminated on one of its sides or both of its sides. Multiple small grooves (B) which are periodic and arc-shaped in longitudinal direction of side material are formed on surface of side material (A). Grooves are spread to external peripheral edge of side material and have curvature radius of 800-1500 mm and period (D) of 1-8 mm in the above direction. Roughness of surface of side material (A) comprises 1-15 mcm as per the average at 10 roughness points (Rz). Side material is made by cutting the ingot into material of the specified thickness and alignment in horizontal position with longitudinal direction of the cut material. Centre of rotating disc device corresponds to ingot centre as to width. Occurrence of bad adhesion between material of core and side material is prevented due to controlling the state of surface and flatness of side material.

EFFECT: improving corrosion resistance of plated element and increasing the heat exchanger obtaining process efficiency.

8 cl, 7 dwg, 1 tbl, 14 ex

FIELD: power industry.

SUBSTANCE: sectional heating radiator includes supply and discharge aluminium headers for heat carrier passage and aluminium tubular sections as heat sinks; the new feature is that external and internal surfaces of heat sinks, as well as internal surfaces of supply and discharge headers are provided with coating from aluminium oxide, which is applied by plasma chemical method; at that, coating thickness of external surfaces of heat sinks is 5…10 mcm, and that of internal surfaces of headers is 20…100 mcm.

EFFECT: increasing radiation coefficient, which allows reducing the surface area of radiators, reducing the number of sections or heat carrier flow rate, reducing corrosion and erosion wear and improving ornamentality without any additional coating.

FIELD: metallurgy industry.

SUBSTANCE: invention relates to a brazing sheet of a laminated aluminium alloy and can be used in the manufacture of heat exchangers. The brazing sheet of the laminated aluminium alloy consisting of the material of the base layer, which on one or both sides has an intermediate layer composed of Al-Si brazing solder located between the base layer and a thin coating layer over the intermediate layer. And the material of the base layer and the coating layer has a higher melting point than the Al-Si brazing solder. The coating layer comprises, in weight %: Bi 0.01-1.00, Mg ≤ 0.05, Mn ≤ 1.0, Cu ≤ 1.2, Fe ≤ 1.0, Si ≤ 4.0, Ti ≤ 0.1, Zn ≤ 6, Sn ≤ 0.1, In ≤ 0.1, unavoidable impurities ≤0.05, Al - the rest.

EFFECT: brazing sheet can be soldered in an inert or reducing atmosphere without the need to use the flux that provides the strength of the brazed joint.

24 cl, 1 tbl, 7 ex

FIELD: metallurgy.

SUBSTANCE: multi-layer sheet for flux-free high temperature brazing comprises an aluminium alloy core coated with intermediate layer of aluminium alloy, and solder of aluminium alloy applied on the intermediate layer. The core is made of 3XXX aluminium alloy containing, wt %: Mn<2.0, Cu≤1.2, Fe≤1.0, Si≤1.0, Ti≤0.2, Mg≤2.5, Zr, Cr, V and/or Sc in total ≤0.2, the rest is Al and unavoidable impurities. The intermediate layer is made of aluminium alloy containing, wt %: Mg 0.2-2.5, Mn <2.0, Cu≤1.2, Fe≤1.0, Si≤1.0, Ti≤0.2, Zn≤6, Sn≤0.1, In≤0.1, Zr, Cr, V and/or Sc in total ≤0.2, the rest is Al and unavoidable impurities. The solder is made of an aluminium alloy containing, wt %: Si 5-14, Mg<0.02, Bi 0.05-0.2, Fe≤0.8, Zn≤6, Sn≤0.1, In≤0.1, Cu≤0.3, Mn≤0.15, Sr≤0.05, the rest is Al and unavoidable impurities. The core material and the intermediate layer have higher melting point than the solder, and the intermediate layer is protective relative to the core. The total thickness of the cladding layer consisting of the intermediate layer and solder layer with respect to total sheet thickness is 3-30%. Soldering can be carried out in inert or reducing atmosphere without necessity of for applying the flux.

EFFECT: possibility for soldering complex designs with corrosion potential.

16 cl, 2 tbl

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