DE202015105743U1 - Inlet air through a turbulence generating grid mixing and a warmed surface having resonant intercooler core - Google Patents

Abstract

A heat exchanger, comprising: an inlet box having an inlet; a vortex inducing structure installed in the entry box; a discharge box with an outlet; a tube fluidly connecting the entry box to the exit box, the tube including an inner surface; and a vortex inducing structure formed on the inner surface of the pipe.

Description

TECHNICAL AREA

The disclosed inventive concept generally relates to intercoolers for motor vehicles. In particular, the disclosed inventive concept relates to a resonant intercooler core having internal structures for generating turbulence and thus improving heat transfer.

BACKGROUND OF THE INVENTION

Internal combustion engines are increasingly being equipped with turbochargers or boosters to force more air mass into the intake manifold and engine combustion chamber. The increased mass air mass results from the fact that the air is compressed by an air compressor driven by a turbine, which in turn is driven by a compressor wheel associated with the exhaust system. Although the supply of compressed air improves the performance of the engine, it heats the intake manifold, causing a reduction in the charge air density.

To compensate for the increased temperature of the incoming air, intercoolers are provided upstream of the air flow. The typical intercooler (LAC) includes an air inlet box, an air outlet box, and a series of elongate and parallel cooling tubes that provide flow communication of the air inlet box with the air outlet box.

Despite constant advances in technology for efficient intercoolers, designers of these coolers are facing challenges due to packaging constraints. It is known that intercoolers should have an area large enough to provide sufficient surface area for proper cooling of the air flowing from the inlet box to the outlet box for high intercooler efficiency. However, the size of the intercooler is often limited by the available space.

Limitations of available space are due to numerous factors. First, charge air coolers should receive "first air" for maximum cooling efficiency, i.e., they should be positioned in front of the radiator and other heat exchangers. Second, known components such. As the active Radareinstellschraube and the active grille shutter housing, a very tight space for the intercooler. The minimum space available for the intercooler is in conflict with the need to provide an intercooler that is as large as possible.

Thus, as in so many areas of vehicle technology, there is room for improvement in the design of intercoolers in which maximum cooling can be achieved using a smaller radiator, thus having an appropriate size for the limited areas present in today's vehicles ,

BRIEF SUMMARY OF THE INVENTION

The disclosed inventive concept overcomes the problems associated with known intercoolers by providing maximum air cooling in a relatively small radiator. This result is generally provided by structures within the charge air cooler that create turbulence in the airflow, thus causing turbulence and increasing heat transfer efficiency.

Recognizing that the flow may be laminar, transient or turbulent during different working conditions of the vehicle, it has been confirmed that the flow is turbulent in most working conditions by providing a selected internal structure. The structures may be one of the following (or a combination thereof): a wire mesh, a wire mesh, and a parallel wire frame provided in the inlet box. By changing the geometry of the internal structure, turbulent vortices are generated at very small length scales. The size of the vortex and the quality of the turbulence can be determined by the geometry of the internal structure.

By adjusting the geometry of the turbulence introducing internal structure, turbulent vortices can be formed at very small length scales. The size of the vortices and the quality of the turbulence can thus be determined by the geometry of the turbulence introducing internal structure. Furthermore, the heat transfer can be increased by adding grooves or warts on an inner surface of the intercooler due to the generated turbulence and the intensified mixing. When the time scale of the transient fluid (i.e., turbulence vertebrae) and the time scale of grooves and warts (the time required for the flow to cross the groove area) coincide, the thermal conductivity increases significantly. This behavior is similar to resonance in structural or vibratory mechanics.

To exploit this resonant effect in the disclosed inventive concept, the resonant intercooler disclosed herein comprises either a long wire pressed into the entry box, or alternatively a wire mesh screen provided at the entrance window of the tube. The geometry of such structures can be adapted to introduce turbulences having nearly the same size as those produced by the surface protrusions or grooves formed on the walls of the tubes connecting the inlet and outlet boxes, thereby creating one Resonance behavior occurs and the heat transfer is considerably increased. An increase in heat transfer allows a reduction in the size of the charge air cooler without affecting the cooling efficiency.

The above advantages, as well as other advantages and features, will be apparent from the following detailed description of the preferred embodiments, taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

For a better understanding of the present invention, reference will now be made to the embodiments which are illustrated in more detail in the accompanying drawings and are described below by way of example for the invention; show it:

1 a top view of a resonant intercooler, which represents an internal turbulence generating structure according to a first embodiment of the disclosed inventive concept;

1A a sectional view of the interior of a tube, which has a warped surface along line 1A of 1 represents;

1B a sectional view of the interior of a tube having a grooved surface along line 1B of 1 represents;

2 a top view of a resonant intercooler, which represents an internal turbulence generating structure according to a second embodiment of the disclosed inventive concept;

3 a plan view of the built-in in the second embodiment of the resonant intercooler according to the disclosed inventive concept wire mesh;

4 a plan view of a frame with parallel wires, which are positioned with respect to the longitudinal axis of the frame in the longitudinal direction, which can be installed as an alternative to the second embodiment of the resonant intercooler according to the disclosed inventive concept; and

5 a plan view of a frame with parallel wires, which are positioned diagonally with respect to the longitudinal axis of the frame, which can be installed as an alternative to the second embodiment of the resonant intercooler according to the disclosed inventive concept.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

In the following figures, the same reference numerals are used to designate the same components. In the following description, various operating parameters and components for differently constructed embodiments will be described. These specific parameters and components are given by way of example and should not be construed as limiting.

The resonant intercooler of the disclosed inventive concept is in its various embodiments in FIG 1 - 5 shown. It should be understood, however, that the illustrated embodiments are merely suggestions and are not intended to be limiting.

Regarding 1 FIG. 12 is a plan view of a resonant intercooler commonly referred to as FIG 10 is shown. The resonant intercooler 10 includes an entry box 12 with an entrance 14 and an entry box body 16 , The entry box 12 may be made of any of various materials, including a polymerized material (such as polypropylene or polyamide) or a metal, or a combination of both.

Several coolant pipes 18 are perpendicular to the entrance box body 16 and extend from it and are thus fluidly connected. The number, shape and placement of the pipes 18 may differ from the illustration.

The resonant intercooler 10 further comprises a discharge box 20 with an exit 22 and a discharge box body 24 , Like the entrance box 12 can the exit box 20 be made of any of various materials, including a polymerized material or a metal, or a combination of both.

Preferably, on the resonant intercooler 10 Mounts for fixing the resonant intercooler 10 on the heat exchanger (not shown), attached to a structure in the engine compartment of the vehicle or both. A first set of brackets 26 and 26 ' and a second set of brackets 28 and 28 ' are preferably provided. The shape, placement and number of brackets can be different and about the brackets shown 26 . 26 ' . 28 and 28 ' go out.

To generate the appropriate turbulence in the coolant tubes 18 have the inner surfaces of the pipes 18 structures formed thereon. The inner surfaces may be provided with warts or grooves, or another turbulence inducing structure may be formed thereon. 1A and 1B represent two non-limiting examples of such structures.

Regarding 1A becomes a pipe 18 shown in partial cross section. The pipe 18 includes an inner surface 30 , On the inner surface 30 of the pipe 18 are raised warts 32 educated. The shape, number and placement of the raised warts 32 can each be different and differ from the representation.

There are other vortex introductory alternatives to the interior surface 30 of the pipe 18 as the in 1A shown raised warts 32 available. Instead of the raised warts 32 can a number of grooves 34 in the inner surface 30 be educated. The grooves 34 can be as shown perpendicular to the longitudinal axis of the tube 18 run or formed axially.

While the sublime warts 32 and the grooves 34 for generating turbulence within the tube 18 are provided, an additional turbulence introducing structure is provided with respect to the incoming air. In particular and with reference to 1 becomes or become one or more arbitrarily arranged wires 36 in the entry box 12 "Pressed", whereby a turbulence is generated in the incoming air, while it is between the inlet 14 and the pipes 18 flows through. The arbitrarily arranged wires 36 can be made of a variety of materials and can be made with different lengths and thicknesses.

Both the geometries of the raised warts 32 and / or grooves 34 as well as the geometries of the arbitrarily arranged wires 36 for maximum cooling within a minimal space in the resonant intercooler 10 be modified. For example, the size, number and spacing of the raised warts 32 and the number, depth and placement of the grooves 34 be modified. In addition, the thickness, the number, the length and the spacing of the arbitrarily arranged wires 36 be modified. By adapting these geometries, an optimal resonance behavior within the resonant intercooler can be achieved 10 be generated to thereby maximize heat transfer.

Although in 1 the use of randomly arranged wires 36 as a method of inducing turbulence within the flow of incoming air as it passes through the inlet box 12 is shown, other structures for inducing turbulence within the incoming air are possible. A non-limiting example of such a structure is in 2 and 3 shown.

Regarding 2 is a plan view of a resonant intercooler according to an alternative embodiment, generally as 40 shown, shown. The resonant intercooler 40 includes an entry box 42 with an entrance 44 and an entry box body 46 , The entry box 12 may be made of any of various materials, including a polymerized material or a metal, or a combination of both.

Several coolant pipes 48 are perpendicular to the entrance box body 46 and extend from it and are thus fluidly connected. The number, shape and placement of the pipes 18 may differ from the illustration. As with the in 1A and 1B shown coolant tubes 18 have the inner surfaces of the coolant tubes 48 trained thereon turbulence inducing structures such. As raised warts, grooves or both, on.

The resonant intercooler 40 further comprises a discharge box 50 with a discharge box body 52 and an exit 54 , Like the entrance box 42 can the exit box 50 be made of any of various materials, including a polymerized material or a metal, or a combination of both.

Preferably, on the resonant intercooler 40 Mounts for fixing the resonant intercooler 40 on the heat exchanger (not shown), attached to a structure in the engine compartment of the vehicle or both. A first set of brackets 56 and 56 ' and a second set of brackets 58 and 58 ' are preferably provided. The shape, placement and number of brackets can be varied and over the brackets shown 56 . 56 ' . 58 and 58 ' go out.

To generate the appropriate turbulence within the entry box 42 is a wire mesh 60 on an inner wall 62 of the entry box 42 attached to the pipes 48 are fluidly connected. An exemplary version of the wire grid 60 is in 3 shown. The wire mesh 60 includes several individual wires 64 which are positioned in a first direction, and a plurality of individual wires 66 which are positioned in a second direction so that the wires 64 and 66 intertwined and thus interconnected.

As with the in 1 The first embodiment of the resonant intercooler of the disclosed inventive concept as illustrated and discussed herein may have the raised warp geometries 32 and / or grooves 34 as well as the geometries of the wire grid 60 in the resonant intercooler 40 be modified to achieve maximum cooling within a minimal space. Again, as noted above, the size, number and spacing of the raised warts can be 32 and the number, depth and placement of the grooves 34 be modified. In addition, the thickness, the number, the length and the spacing of the individual wires 64 and 66 be modified. By adapting these geometries, an optimal resonance behavior within the resonant intercooler can be achieved 40 be generated to thereby maximize heat transfer.

Alternative structures to the wire mesh 60 can be used in conjunction with in 2 illustrated resonant intercooler of the disclosed inventive concept can be used. Such an alternative structure is in 4 shown in the turbulence inducing structure 70 is shown in plan view. The turbulence inducing structure 70 includes a frame 72 with a series of parallel wires attached 74 , It is understood that, although the parallel wires 74 in the illustration parallel to the longitudinal axis of the frame 72 are positioned, the parallel wires 74 perpendicular to the longitudinal axis of the frame 72 can be positioned.

As a variation of in 4 shown turbulence inducing structure 70 is in 5 a turbulence inducing structure 80 shown. The turbulence inducing structure 80 has a frame 82 with wires 84 which are relative to the longitudinal axis of the frame 82 are positioned diagonally on.

The thickness of the wires 74 and 84 and the spacing between the wires 74 and 84 can from the representations of 4 respectively. 5 differ. Again, an adaptation of such variables can be made to produce optimal resonance behavior that maximizes heat transfer.

The resonant intercooler of the disclosed inventive concept in its various embodiments overcomes the problems of known systems by providing maximum heat exchange in a minimal space. It will be understood that the resonant system disclosed herein with respect to intercoolers is discussed; the use of turbulence inducing structures with respect to the inlet box and the tubes may also find application in other heat exchangers, including, but not limited to, condensers, gearbox coolers, and coolers.

Although the preferred embodiments of the disclosed inventive concept are discussed, shown in the accompanying drawings and are set forth in the accompanying description, it will be readily apparent to those skilled in the art from such discussion and from the accompanying drawings and claims that various changes, modifications and other features and variations may be made thereto without departing from the true spirit and scope of the invention as defined by the following claims.

Claims (13)

A heat exchanger comprising: an entry box with an entrance; a vortex inducing structure installed in the entry box; a discharge box with an outlet; a tube fluidly connecting the entry box to the exit box, the tube including an inner surface; and a vortex inducing structure formed on the inner surface of the pipe. A heat exchanger according to claim 1, wherein the structure inducing turbulence in the inlet box is a wire. The heat exchanger of claim 2, wherein the wire comprises a plurality of arbitrarily arranged wires. Heat exchanger according to claim 2, wherein the wire comprises a wire mesh. A heat exchanger according to claim 4, wherein the wire mesh is formed by a plurality of crossing wires. The heat exchanger of claim 1, wherein the wire comprises parallel wires positioned on a frame. A heat exchanger according to claim 1, wherein the turbulence inducing structure formed on the inner surface of the tube is a plurality of raised warts. A heat exchanger according to claim 1, wherein the structure inducing turbulence formed on the inner surface of the pipe is a plurality of grooves. A heat exchanger according to claim 1, wherein the turbulence inducing structure formed on the inner surface of the tube is a combination of a plurality of raised warts and a plurality of grooves. A heat exchanger comprising: an entry box; a swirl inducing entrance structure incorporated in the box, wherein the swirl inducing entry structure is selected from the group consisting of randomly arranged wires, intersecting wires, and parallel wires; a discharge box; a tube fluidly connecting the entry box to the exit box, the tube including an inner surface; and a vortex inducing tube structure formed on the inner surface, wherein the vortex inducing tube structure is selected from the group consisting of warts and grooves. A heat exchanger according to claim 10, wherein the wire mesh is formed by a plurality of crossing wires. A heat exchanger according to claim 10, wherein the turbulence inducing structure formed on the inner surface of the pipe is a combination of the randomly arranged wires and the wire mesh. A heat exchanger according to claim 10, wherein the turbulence inducing structure formed on the inner surface of the tube is a combination of the warts and the grooves.

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