The heat exchanger

 

(57) Abstract:

Usage: in heat technology, in particular, in the cooling systems of internal combustion engines. The essence of the invention: improvement of thermal and mass and size parameters, as well as the increased reliability provided by the fact that the heat exchanger containing at least two tank connected by tubes to pass, mainly, the liquid coolant having walls arranged with a constant pitch of wydawcy 7 forming the outer cavity and an inner ledges, and United with the walls of the tubes outer transverse edges 6a, located along the length of the tubes with a constant step b and forming channels for the passage of the second, predominantly gaseous fluid at an angle to the direction of passage of the first fluid, step vydavac 7 made more step b of edges 6a. 3 C. p. F.-ly, 6 ill.

The invention relates to a heating engineer, and in particular to heat exchangers, such as radiators, cooling systems of internal combustion engines.

Known heat exchangers, such as radiators, cooling systems of internal combustion engines containing at least two tank connecting tube designed the side, for example soldered, the outer transverse ribs that are constant along the tube step and forming channels for the flow of the second fluid predominantly gaseous, e.g. air, at an angle to the direction of flow of the first fluid. M. the motor cycle", 1958 [1]

When creating such heat exchangers there is a task to provide the required heat transfer for optimum weight and performance, low resistance to the passage of fluids and technological suitability for mass production.

Known heat exchangers of the specified type with tubes having walls arranged with a constant along each tube step wydawcy forming the outer cavity and an inner protrusions [2]

In such heat exchangers due to the increased heat transfer between the first fluid and the tube wall can increase the total heat transfer to either reduce the weight and dimensions for a given heat exchange.

However, due to the fact that part of the outer transverse ribs may be placed against the outer depressions on the walls of the tubes and not to be in thermal contact with the walls of the tubes, in such heat exchangers is not achieved optimal performance.

SIS made cross wydawcy, forming an outer cavity and an inner projections [3] In such a tube, the depth of each depression is made constant. This embodiment, while also improving heat transfer between flowing inside the tube by the fluid and the walls of the tube by increasing the degree of turbulence in the coolant flow, is not optimal for strength reasons and does not reduce the thickness of the walls.

Thus, despite the known heat exchangers of this type, their thermal, mass and strength properties are not optimal.

The basis of the invention was tasked to create a heat exchanger with high heat transfer, reduced consumption and increased strength.

The main aim of the invention is the improvement of thermal and mass and size parameters of the heat exchangers of this type. In addition, the aim of the invention is to increase the strength of the tubes of such heat exchangers. This goal is achieved by the fact that the heat exchanger containing at least two tank connecting tube designed for flowing the first fluid, primarily liquid between the tanks and having walls spaced the ones with the walls of the tubes, for example soldered, the outer transverse ribs that are constant along the tube step and forming channels for the flow of the second fluid predominantly gaseous, e.g. air, at an angle to the direction of flow of the first fluid, according to the invention the step above vydavac more than a step above the transverse ribs.

It is recommended to perform the step above vydavac to step above the outer transverse edges equal to the ratio of two relatively Prime numbers, the smaller of which more than a dozen.

This embodiment of the heat exchanger allows you to minimize the combination of the outer cavities of the tubes and the outer transverse edges and thereby eliminate gaps between them, impairing heat transfer.

The depth of each of the specified trench in a direction across the tube is made variable with the highest value in its middle part.

Each hollow in cross section, held across the tube may have an arched shape.

This embodiment of the tube increases its strength and rigidity, which reduces the wall thickness of the tube and thereby to reduce its consumption.

Further, the invention is illustrated on-tape heat exchanger according to the invention, General front view of Fig.2 tubular heat exchanger according to the invention, a General front view of Fig. 3 section III-III in Fig.1; Fig.4 section IV-IV in Fig.3; Fig.5 section V-V in Fig.2; Fig.6 section VI-VI in Fig.5.

As shown in Fig.1 and 2, the heat exchanger includes two tank top 1 and bottom 2, connected by tubes 3 held for flowing liquid coolant between the tanks, and rigid side walls 4. The upper tank 1 has a filler neck 5 and the inlet pipe (not shown). The lower tank 2 has a discharge pipe (not shown). With walls (not labeled) of the tubes 3 are connected to the outer lateral edges 6A (Fig.1) formed by corrugated strips arranged between the tubes 3 and is also marked 6A, or formed by plates 6b (Fig.2). The connection of the transverse edges with the walls of the tubes is carried out by means of soldering.

Tubes 3 are on the walls of the transverse wydawcy 7 (Fig.3-6) that are constant along each tube step d. Wydawcy 7 form an external cavity 7a and the inner protrusions 7b and are staggered on opposite walls of the tubes 3. The opposite wall of the tube 3 and tube tape heat exchanger, which is made of wydawcy 7, the imp is the intellectual property).

Transverse ribs 6A, 6b are constant along the tube step b to form 8 channels for the flow of the second gaseous fluid, for example air, from the outside of the tubes 3 at an angle to the direction of flow of the liquid coolant inside the tubes. Step and vydavac 7 and step b of the transverse ribs are made different, namely: step and more step b. The maximum size of each of wydawcy 7 in the direction along the tube 3 is larger than the thickness d of each rib 6A, 6b. Step b transverse ribs 6A, 6b is larger than the size of S. the Ratio of step a to step b is equal to the ratio of two relatively Prime numbers, the smaller of which more than a dozen.

Transverse ribs 6A formed of corrugated ribbons, made the slits 9, the edges of which are bent so that these edges formed by the slits for the passage of the second fluid at an angle to the surfaces of the ribs. Transverse ribs 6b formed by the plates may have corrugations (not shown in the drawings).

The depth of each trench 7a in the wall of the tube 3 (Fig.6) is made variable, and has the largest value in the middle of wydawcy 7. Depression 7a in section conducted across the tube has an arcuate shape.

The heat exchanger works as follows.

First theplanet ACOK 2 and is discharged from it. A second fluid having a second temperature, flows through the channels 8. As a result of heat exchange between the heat transfer through the walls of the tube 3 there is a change of temperature. The inner protrusions 7b increase the turbulization of the first fluid and improve heat transfer. The transverse outer edges 6A, 6b, with thanks to the above described features good thermal contact with the walls of the tubes, also help to improve heat transfer. The above-described shape of the depressions formed by wydawca on the walls of the tubes, contributes to the strength and rigidity of the tubes. As a result, the heat exchanger has a given mass parameters improved thermal performance or under specified thermal characteristics of less weight and less consumption.

The most successful of the invention can be used in the radiator liquid cooling systems of internal combustion engines of automobiles and tractors, gas-air heat exchangers transport and stationary power plants, heating systems, ventilation and air-conditioning. You can use the invention in refrigeration machines.

2. The heat exchanger under item 1, characterized in that the step of the above vydavac to step above the outer transverse edges is equal to the ratio of two relatively Prime numbers, the smaller of which more than a dozen.

3. The heat exchanger under item 1, characterized in that the depth of each of the specified trench in a direction across the tube is made variable with the highest value in its middle part.

4. Heat exchanger according to p. 3, characterized in that each hollow in cross section, held across the tube is made arcuate.

 

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