The heat exchanger

 

(57) Abstract:

The invention is intended for use in heat technology, and can also be used in the manufacture of heat exchangers, providing comfortable conditions in the cabin of a vehicle and indoors. The invention includes a tube coils, side walls, and the space between the front and rear surfaces of the heat exchanger filled with a porous metal received in the specified volume of the compact molten metal by filling the said space by a granular material, the melting point of which is above the melting temperature of the desired porous metal, heating the granular material and the said coils to a temperature close to the melting temperature of the compact metal, filling voids between the grains of this metal in the molten state, and removing granular material after cooling. The result of the invention is to increase the mechanical strength of the heat exchanger, as well as simplifying and reducing the complexity of its manufacture. 2 C.p. f-crystals, 1 Il.

The invention relates to heat engineering, primarily for vehicles, namely, to arrange the Finance air.

A device that provides ventilation and heating of the cabin of the vehicle, including the chassis and placed in it the elements for cooling and heating air, which is made of composite sections, arranged with a clearance in the direction of air, and placed in the gap flap [1].

The disadvantage of this device is its large size and the inconvenience of maintenance.

A known heat exchanger containing a coil of pascavale multichannel tubes of aluminum alloy, the channels of which are connected with the collectors and muted on the ends of the tubes in alternate order, and their walls are made with holes, connecting them with appropriate manifolds [2].

The use of this heat exchanger as cooler and air heater in the car, you can greatly reduce the size of the device cooling and heating of air.

The disadvantage is the low efficiency of heat transfer and the complexity of manufacturing.

Well-known automotive heat exchanger for cooling the oil in which the oil is pumped through tubes embedded in a layer of porous metal, through which pressure is leaking water and Arsenie the structure of the porous metal during pressing of the tubes in a layer of porous metal, if it is made after sintering, as when securing tubes disrupted the structure of the pore space not only in the field of securing tubes, but also in adjacent areas of the heat exchanger due to the transfer of mechanical stresses on the skeleton of porous metal;

- when pressing the tubes before sintering of porous metal or by pressing the package with tubes of possible deformation of the tube during sintering or pressing;

- relatively high thermal resistance between the tube wall and the porous metal during pressing of the tubes, which reduces heat transfer;

- low mechanical strength, especially under vibration loads.

A known heat exchanger containing a coil in the form of multi-channel flat tubes made of aluminum alloy, equipped with fins, and between the turns of the coil are additionally plate heat transfer section, is bonded to the coil by means of a beading and a common inlet and outlet manifolds [4].

The disadvantage of this heat exchanger is low heat transfer efficiency, and the complexity and lack of production.

Low efficiency t is the internal fins with surface plates, as well as the flatness of the last to seal brazed joints.

The closest technical solution, selected as a prototype, is the heat exchanger containing the coil of the multi-channel flat tubes with fins, additional heat transfer section, is bonded with the coil through the said fins, additional sections are in the form of a coil, identical to this, and the turns of one coil turn round the coils of the other, and the distance between the straight portions of the inner loop at least twice the distance between these areas and the adjacent rectilinear sections of the external loop [5].

The disadvantage of this heat exchanger is relatively low heat transfer efficiency, the complexity of manufacturing.

The relatively low efficiency of heat transfer due to the difficulty of ensuring good contact between the inner fins and tubes of the coil. With this bound and the difficulty of manufacture of the heat exchanger.

The purpose of the production - the intensification of heat transfer, increase strength, vibration resistance and rigidity of the heat exchanger, the simplification and reduction of the heat exchanger, containing the primary coil of the multi-channel flat tube and an additional coil, identical to this, as well as input and output manifolds, and the turns of one coil turn round the coils of the other, and the distance between the straight sections at least twice the distance between these areas and the adjacent straight sections of the outer loop, while according to the invention the space between the tubes of the coils, side walls and front and rear surfaces of the heat exchanger filled with a porous metal received in the specified volume of the compact molten metal by filling the said space by a granular material, the melting point of which is above the melting temperature of the desired porous metal, heat the granular material and the said coils to a temperature close to the melting temperature of the compact metal, filling voids between the grains of this metal in the molten state, and removing granular material after cooling eradicating, dissolution or otherwise.

Distinctive features of the proposed technical solutions are:

1. The implementation of Teploobmen side walls and front and rear surfaces of the heat exchanger filled with a porous metal, received in the specified volume of the compact molten metal.

3. The technology of filling the said space of the porous metal: by filling this space with granular material, the melting point of which is above the melting temperature of the desired porous metal, heating the granular material and the said coils to a temperature close to the melting temperature of the compact metal, filling voids between the grains of this metal in the molten state, and removing granular material after cooling eradicating, dissolution or otherwise.

The claimed technical solution distinctive signs are individually known in other fields of technology properties, and together with the characteristics of the prototype, exhibit properties that allow you to increase heat transfer efficiency, increase strength, vibration resistance and rigidity of the heat exchanger, to simplify it and reduce the complexity and, accordingly, the manufacturing cost of the heat exchanger, which indicates that the technical solutions according to the criterion of "significant differences".

The drawing shows schematically the proposed heat exchanger may be single-channel), thus the coils of one coil turn round the coils of the other. Each coil 1 and 2 has its input and output manifolds, respectively, 3 and 4. The distance between the straight portions of the inner coil H1 is at least two times larger than the distance H2 between each of them and the adjacent straight section of the outer coil. The space between the tubes of the coils 1 and 2, side walls and front and rear surfaces of the heat exchanger filled with a porous metal 5, received in the specified volume of the compact molten metal by filling the space specified granular material, the melting point of which is above the melting temperature of the desired porous metal, heating the granular material and the said coils to a temperature close to the melting temperature of the compact metal, filling voids between the grains of this material placed in the expanded position, and removing granular material after cooling by etching, dissolving, or otherwise.

The operation of the heat exchanger is carried out as follows, for example, using a heat exchanger for air conditioning systems and heating the interior of the passenger car. the summer heat exchanger operates in the cooling mode as the evaporator the evaporator of the air conditioning system. To do this, one of the coils, for example 1, through inlet and outlet manifolds 3 the coolant circulates the air conditioning system that removes heat in boiling liquid. On the second coil 2, the coolant is not circulating. Air is blown through the porous metal 5 is sent into the passenger compartment, providing there comfortable environment.

In winter, the heat exchanger operates in the heating mode as the heater of the heating system of the vehicle. For the other coil 2 through the inlet and outlet manifolds 4 is liquid, cooling the engine. The coil 1, the refrigerant is not circulated. Air is blown through the porous metal 5, is heated, it increases the temperature in the vehicle interior.

The efficiency of the heat exchanger can be enhanced by turbulence in the flow in the tubes, if the straight sections of the tubes of the coils are made with the turbulent elements inside the tubes. This can be done, for example, knurling, reducing the internal diameter of the tube (d) to 0.8 d and carried out on a straight stretch of sdla air volume you can achieve the greatest heat transfer from tubes blown air.

The proposed heat exchanger has a more intense heat blown through it to the air compared to the same heat exchangers, made according to the known structural and technological solutions. This is achieved, firstly, by the fact that thermal resistance between the porous metal and the walls of the tubes of the coils, through which flows a cooled or heated liquid, minimal, due to the practical disappearance of the border between the outer surface of the tubes of the coils and the porous metal due to the formation of a single crystalline structure of the metal tubes and porous metal; secondly, the fact that the length of the meandering channels in the heat exchanger, through which blown air, significantly greater than the thickness of the porous metal, as these channels are formed by voids in the compact metal having a winding connected to each other and, therefore, blown air does a tortuous path during its passage through the heat exchanger; thirdly, the fact that blown through the heat exchanger the air is doing mainly turbulent motion, since the channels are composed cavities are narrow and extensions that create turbulence blown air and, thereby, spostati porous metal heat exchanger, you can adjust the aerodynamic resistance of the heat exchanger is blown through it to the air and to provide optimal mass flow rate of the blown air, which provides the greatest heat air or cooling.

The proposed heat exchanger also has a compact design, high strength, vibration resistance and rigidity, easier and less time-consuming to manufacture. The latter contributes to the reduction of its cost.

Compact, high strength, vibration resistance and rigidity in the proposed heat exchanger is ensured by the fact that the porous metal obtained from compact molten metal, forms together with the coil is a single structure, such a structure reinforced concrete structures, but unlike them it is practically homogeneous and permeable to air, as it has many winding channels through which blown air.

The cost of the materials and equipment needed for production, and complexity of manufacturing are essential components of cost. The simple design of the proposed heat exchanger and the lack of soldering and welding Sachiko common materials in its manufacture significantly reduces the cost. The starting materials for making the most simple of the proposed heat exchanger is aluminum or aluminum alloy thin-walled tubes as coils, aluminum ingots as a compact metal salt as a granular material, and the solvent can be plain water, cold or warmed up.

These materials are suitable for the manufacture of most heat exchangers used in cars and air conditioning equipment. In cases where the imposed more stringent requirements may be applied to other materials.

Since both coils are identical and placed in the porous metal in the process of its formation, it will exceed the manufacturability of the heat exchanger compared to the prototype. This completely eliminates soldering or welding and the possibility of leakage of the heat exchanger.

References

1. USSR author's certificate N 321660, class B 60 S 3/00, 1967.

2. USSR author's certificate N 992992, CL F 28 D 7/08, 1983.

3. In the book "New in powder metallurgy". Translation from English. - M. : metallurgy, 1970, S. 168-179.

4. USSR author's certificate N 1092356 CL F 28 D 7/08, 1984.

2. The heat exchanger under item 1, characterized in that the straight sections of the tubes of the coils are made with the turbulent elements inside the tubes.

3. The heat exchanger under item 1,2, characterized in that the permeability of the porous metal for air

 

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