JPS6273088A - Cooler - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention The present invention provides an outer tube whose circumferential wall is closed and an inner tube whose circumferential wall which is coaxial with the outer tube and whose circumferential wall is not closed. In this case, the inner tube has at least
The outer tube also has at least on its inside a radially extending rib parallel to the axis of both circumferential walls, and both circumferential walls have a corresponding circumferential contour. This is related to coolers, such as oil coolers.

U± This column head cooler is described in U.S. Patent No. 4.345,64.
It is known from No. 4 Mei 4l1g. In this cooler, the inner circumferential wall and the outer circumferential wall are formed as a one-piece extrusion, in which case an annular chamber bounded by both circumferential walls extends radially into the circumferential wall. It is divided into individual chambers by connecting webs.

The ends which are open to the front fltll are capped at 1'71'' by a ring 1 no.z camp, these caps having inlet or outlet openings for the medium to be cooled. An extrusion tool for such a profile cannot be manufactured (1).Moreover, the ratio of the through-flow cross-section to the peripheral length of the through-flow cross-section is not suitable.

This ratio, among other things, determines the cooling capacity. Another factor that significantly influences the cooling capacity is the thickness of the medium I+ layer between two adjacent interfaces of the cooler.

Extensive experiments have shown that when this layer or layer thickness lies within the range of 2 tons of jγ or boundary layer thickness of the medium to be cooled, the cooling capacity is significantly improved. do. Here, under the term boundary layer, we mean a layer of gaseous or liquid medium along a solid wall, lying directly in the vicinity of the wall, increasing the flow velocity from a zero value progressively to the value of the external flow. It refers to a rising flow layer.

In this case, the boundary layer thickness is the distance from the wall until the flow velocity reaches approximately 99z of the external velocity. For air and water, the boundary layer is about 2 mm, and for oil (transmission oil) the boundary layer can reach up to 6+ am. Therefore, for an effective cooler it is important that the distance of the cooling surface is relatively small. On the other hand, the cooler structure allows the cooler to have different throughflow rates, while maintaining the above-mentioned criteria, so that the throughflow velocity of the medium entering the cooling capacity is also a factor. It should be configured to be adaptable without being changed.

``Encounter with friends'' is called ``Dharma'' 7.

The invention starts from a cooler of the type mentioned at the beginning.

The problem on which the invention is based is now to improve the specific cooling capacity of such a cooler, and thus to form the ratio of the through-flow cross-section to the circumferential length of the through-flow cross-section in a favorable manner; The objective is to obtain a structural premise that simplifies the manufacture and assembly of such a cooler.

According to the present invention, the height of the ribs is now measured in the radial direction and the height of the ribs is equal to the inner diameter of the outer circumferential wall and the inner diameter of the inner circumferential wall. It is half the difference from the outside diameter, and the distance from the inner peripheral wall to the outside l
\Each projecting rib equally divides a subchamber bounded by two adjacent inwardly projecting peripheral wall ribs, in which case the number of subchambers is The number of ribs on the inner circumferential wall is the same as the number of ribs on the inner circumferential wall.

According to a second feature according to the invention, the outer circumferential wall and the inner circumferential wall are corrugated with respect to each other, so that the enlarged or extended front end region of the profile is
During assembly, they engage each other in a tooth-like manner and prevent the profiles from rotating relative to each other during brazing or welding of the front separating joint. This makes it possible to easily determine the position of the profile pieces to be connected, so that the outwardly projecting ridges of the inner circumferential wall are correctly positioned on the inwardly projecting rib portions of the outer circumferential wall. lying in the chamber and dividing it into equal parts, thereby ensuring that the same geometrical relationship exists on the entire circumferential wall of the cooler.

Figure 1 of the So-JLJ drawing shows a cross section of an extrusion-molded outer tube 1. Its original peripheral wall 2 is formed in a wave shape, and in this case, each wave ridge 3 has a , an outer rib 4 is connected to the trough 5 of each wave, and an inner rib 6 is connected to the trough 5 of each wave.

The wave crests 3 and the wave troughs 5 extend parallel to the longitudinal axis of the outer tube 1. The wall thickness and the actual wall thickness of the circumferential surface 2 and of each rib 4 and 6 are very small. Moreover, there are four ribs 4 or 5 per circumferential length unit, so the pitch of the ribs is large.

FIG. 2 shows a cross-section of the extruded inner tube 7, whose original circumferential wall 8 is likewise formed in a wave-like manner, and moreover, with respect to the circumferential wall 2 of the outer tube 1. , are formed into a corresponding shape j+3. Connected to each wave crest 9 is an outwardly directed rib 10. rib 10
The pitch corresponds to that of the outer wall 2.

For forming and finishing the cooler, extruded tubes 1 and 7 of equal length thus formed are slid into each other. The radial depth II of the ribs 6 or 10 is approximately equal to half the difference between the average inner diameter of the outer peripheral wall 2 and the average outer diameter d of the inner peripheral wall 8, so that
Both the ribs 6 and 10 form an annular chamber bounded by the two mutually displaced profiles in a radial direction (Fig. 3). The outer boundary angle of the rib 6 or 10 radially bridging the annular chamber described above is
In this case, each of them lies in a groove-like depression (wave trough) formed by waves of circumference v2 or 8, so that due to the uniform pitch of the annular chambers mentioned above, a large number of identically sized In this case, the ribs 10 projecting outward from the inner circumferential wall 8 are each divided into two chambers.
A partial chamber 11 bounded by two adjacent inwardly projecting ribs 6 of the outer circumferential wall 2 is equally divided.

The width of this partial chamber 11 is very small, however,
It should be understood that FIG. 1 and the other figures also depict components to an enlarged scale. In reality, these parts are only half the size of the plate shown.

The equally divided partial chambers 11 form a flow-through cross section,
The walls bounding them, here ribs 6 and 10, lie very close to each other, ie separated from each other by a distance M, measured in the circumferential direction. This distance a corresponds to twice the boundary layer of the medium to be cooled.

The flow cross section that can be seen from Fig. 3 is as follows while maintaining the distance a:
Also, if it is to be enlarged while maintaining the external dimensions of the cooler, the inner tube 7 can be used with a smaller inner diameter and at the same time enlarge the height I+ of the ribs 6 and 10. . Variations in this dimension are, of course, only possible within certain defined limits. Because, on the one hand, the inner tube 7
This is because the diameter d of the outer tube 1 cannot be arbitrarily reduced and, on the other hand, the height 11 of the rib 6 of the outer tube 1 cannot be increased arbitrarily. The tubes 1 and 7, which are moved into each other to form the cooler, should be closed on the front side. For this purpose, a closure cap 15, shown in longitudinal section in FIG. 4, serves. This cap 15 is
Seen in the axial direction, it has two parts 16 and 17 with different diameters and a central through-opening 18.

Within the portion 17 having a smaller outer diameter there is an axially elongated annular chamber 19, which is similar to the portion 16.
a second annular chamber 2 open to the outside, provided in the
It is shifting to 0. When the annular chamber 19 is bounded by cylindrical walls 21 and 22, the walls 23 and 24 of the second annular chamber 20 are contoured correspondingly to the external contour of the outer tube 1 and the internal contour of the inner tube 7. It is attached. This contour is shown in the front view of the closure cap 15 according to FIG. The mutually transitioning annular chambers 19 and 20 have different radial extents and each one in the transition region between these two annular chambers 19 and 20, respectively.
lying on each other so that individual shoulders 25 are formed. A connecting branch 26 is formed on the side of the closure cap 15 and in the section 17 .

These closure caps 15 now have, on the end side,
moving over the tubes 1 and 7 inserted into each other,
In that case, the front edge areas of both tubes 1 and 7 are covered by an annular chamber 20 (FIG. 6).

The front corners of these two tubes 1 and 7 then rest against the above-mentioned shoulders 25. In the mutually overlapping regions, the mutually connected parts are glued. Due to the contouring shown here, these adhesive surfaces are very large; the closure cap 15 is expediently made from a synthetic resin material, which, at least in a narrow area, When a pressure KID acts on the cooler when operatively mounted, the above-mentioned elasticity of the material from which the opening cap 15 is made has a certain elastic expansion property. Therefore, the annular chamber 20 performs the function of an expansion chamber, at least within a certain periphery, and
Release the load on the adhesive surface. Such pressure shocks must be taken into account, for example, when the cooler lies in the oil circuit of an automatic control drive of a motor vehicle.

Instead of an adhesive connection between the tube 1.7 and the cap 15,
Mechanical coupling members can also be used, for example a large number of drawbars distributed along the periphery and arranged parallel to the axis of the cooler, These are indicated by dashed lines 27 in FIG. The outer shoulder 28 of the opening cap 15 is then provided with an annular bearing section 29, which is also shown in FIG.
For example, the end portions are tightened with screws.

Instead of the connecting branch 26 made integral with the closure cap 15, only one hole is provided in the part 17.

A connecting nipple can then be inserted into it.

It is expedient for the circumferential surface of the part 16 of the closure cap 15 to be contoured in a similar manner, and that this contour results in a saw-toothed web 30 (FIG. 5). ing. A cooler of this type can be integrated into a tube, for example, in which case this web 30 then fulfills two purposes.

That is, on the one hand, to hold the cooler in position correctly within this tube, and on the other hand, to interlock and delimit the mass flow opening with the inside of the tube receiving and receiving the cooler. A medium to be cooled can flow through this opening. Such a tube is indicated by a dashed line 32 in the fifth [21].

In the illustrated embodiment, the peripherally closed outer tube and inner tubes g1 and 7 are cylindrical. The gist of the invention lies in the selection of a peripheral contour of the pond, for example an elliptical or polygonal peripheral contour. At that time, the closure cap 15 in a corresponding manner
should be formed.

In the illustrated embodiment, the outer tube 1 (FIG. 1)
The external contour is radially symmetrical. Such a configuration is expedient when the cooler is, for example, inserted into a conduit. this is,
This is the case of an automobile oil cooler, in which the oil cooler is integrated into a water cooler. However, on the outside of the outer tube 1, for example, a crosspiece may be provided, which is extruded together with the tube 1 and formed integrally with the tube, as indicated by the dashed line 14 in FIG. Although it is also possible, this also falls within the gist of the present invention. Such a crosspiece 14 is useful for fixing the cooler. If such a bar 14 is provided, the boundary wall 23 on the outer periphery of the second annular chamber 20 of the closure cap 15 should of course also be designed accordingly.

Without limiting the invention, for example:
Some useful dimensions for coolers used as oil coolers in such automobiles are as follows.

If the outer tube 1 has an outer diameter of approximately 40 + nm, the outer diameter of the inner tube 7 is approximately 30 m to. The average thickness S of the ribs 4.6 is approximately 0.6 ton+, and the original wall thickness of the peripheral wall 2 or 8 is approximately 0.6+n t
It is o. Furthermore, on the one hand, the through-flow cross section and on the other hand,
The ratio between T:1 and the circumferential length of the flowing cross section is very favorable, as FIG. 5 makes directly clear. The average diameter of the outer periphery M2 is further approximately 32 + nm
and the average diameter of the inner peripheral wall 8 is V)221Oτ
0. When the tubes are joined together, the waves engage with each other in a tooth-like manner, and this tooth-like mutual engagement ensures that the tubes are mutually aligned, so that the inner peripheral wall Ribs 10 protruding outward from
The rib 6 that is correctly positioned and protrudes inward from the outer peripheral wall
The width a of the eight partial chambers 11 which lies in the partial chambers 11 and divides it into equal parts so that the same geometrical relationship exists over the entire circumference of the cooler is: Each is best suited to the medium to be cooled. Due to the proposed construction, the elements forming the cooler can be combined with the average 11i'X a of the subchambers 11 simply by the number III Ill
It is possible to form the structure as follows. This value then corresponds to a boundary layer thickness twice that of the medium to be cooled, so that the best cooling capacity can be expected. Also, ribs 4.6 and 10
are planar, and it is further noted that the planar portions can be bounded, but also in such a way that the surfaces of these ribs are somewhat wavy. Capture sh otsuko)- and stone it with ♀1- again-
It is also mentioned that multiple oil coolers of the construction type described here can be combined into groups and assemblies.

A second embodiment of the cooler with the structural elements described in detail according to FIGS. 1 and 2 is now shown in FIGS. 7.8 and 9. To form and make this cooler, again,
Also, the extruded tubes 1 and 2 formed in this way and having approximately the same length are slid into each other. However, when the extruded tubes 1 and 2 are slid together 1jq, an outwardly projecting rib 1o is formed at the end portion of the inner tube 7, and similarly, the inner tube 1 A rib 6 protruding from the top is separated.

The inner tube 7 is then enlarged in this end region in a conical or trumpet-like manner, to the extent that its enlarged outer edge rests against the inside of the outer circumferential wall 2 ( 7), this enlargement is possible despite the relatively thin walled circumferential surface 8 due to the form of the profile. This is because the above-mentioned waves form, as it were, a reserve of material, which now, in the course of a remarkable expansion of the surrounding area, This is because you can be drawn to it. The tubes 1 and 7, which are slid together along the butt or separation seam 12, are then welded, brazed or glued.

It is also possible, instead of enlarging the inner tube 7, to compress the outer tube 1, in which case also the ribs 6 or 10 have to be separated in the end region. Furthermore, such corrugations of the circumferential wall 2 of the outer tube 1 are advantageous for a controlled contraction.

FIG. 8 shows the front side of the cooler prepared for welding or brazing, in which the above-mentioned trumpet-shaped enlargement of the original circumferential wall 8 of the inner tube 7 can also be seen. In the vicinity of the end region, an inlet or outlet opening 13 is provided in the outer circumferential wall 2, to which a conduit or a port conduit can be connected by suitable and known means.

In the illustrated embodiment, the outer tube and the inner tube 1 and 7, which close the peripheral wall, are cylindrical. It is also within the scope of the invention to select other circumferential wall contours, for example elliptical or polygonal shapes.

In the embodiment according to FIGS. 7 to 9, each of the dimensions mentioned above in connection with the first described embodiment, when placed on the basis, to an extreme extent, the front face of the inner circumferential wall 8. You can see if it is enlarged on the side. When the quantities listed above are taken into account, the marginal difference becomes △U·π(D−d
), a value of approximately 30 ml11 results. For the first periphery, this gives an expansion of approximately 451. The special configuration of the peripheral wall 2 or 8 allows for enlargement in this extreme dimension.

On the front side, the inner and/or outer circumferential walls are expanded or contracted relative to their original shape, although the waves remain as such. During mutual sliding of the tubes, the waves then engage with each other in a tooth-like manner, and by means of this tooth-like mutual engagement, the tubes are positioned relative to each other, so that the outer surface of the inner circumferential wall The inwardly projecting ribs are positioned correctly and lie within the sub-chambers of the inwardly projecting ribs of the outer circumferential wall, dividing this into equal parts, so that the same geometrical relationship is maintained around the entire periphery of the cooler. exist.

The width of the subchambers 11 is in each case suitably adapted to the medium to be cooled. This makes it possible for the proposed construction to reduce the elements forming the cooler to the partial chamber 11.
The average width of the tube can be approximately 0.2 on+, which allows for the best cooling capacity.

In the embodiment shown in FIG. 7, an inlet or outlet opening 13 for the medium to be cooled is provided in the outer circumferential wall 2. It is also within the scope of the invention to provide this opening in the inner circumferential wall and in the inner circumferential wall and the outer circumferential wall.

Moreover, what is said from the embodiments described above in general form also applies to the embodiments described secondly.

Departure”! υ Example - The present invention has the above-described configuration and operation, and therefore provides a novel cooler with improved specific cooling capacity that facilitates manufacture and assembly.

[Brief explanation of drawings]

1 is a cross-sectional view of the outer tube, FIG. 2 is a cross-sectional view of the inner tube, and FIG. 3 is the cooling formed by the mutual insertion of both tubes shown in FIGS. 1 and 2. III- in Figure 6 of the vessel.
FIG. 4 is a cross-sectional view of the closure cap on the front side, and FIG. 5 is a cross-sectional view taken along line III. ix
6 is a longitudinal sectional view in the front area of the cooler; FIG. 7 is a partial sectional side view of the second embodiment of the cooler; FIG. 8 is a front view of the front side of the cooler as seen in the direction of the arrow not shown in FIG. 7, and FIG. 9 is a sectional view taken along line IX-IX in FIG. ... Outer tube, 2. Outer wall, 3. Wave crest, 5. Wave trough, 4.6.10... Rib, 7... Inner tube, 8...
Inner peripheral wall, 11... Partial chamber, 15... Closure cap, 1
6.17...part, 1J20...annular chamber, 25...
・Shoulder, 24... Boundary wall, 26... Connecting branch pipe.匡■の-PLl”) 工くりC力u、l＠IJ.

Claims (1)

[Claims] 1. It has an outer tube (1) with a closed peripheral wall and an inner tube (7) with a closed peripheral wall lying coaxially with the outer tube (1). ) is at least outside of
The outer tube (1) also has at least ribs (6, 1) extending in the radial direction and parallel to the axis of the peripheral wall.
0), and the inner and outer tubes are measured in the radial direction of the ribs (6, 10) in a cooler, for example an oil cooler, consisting of an extruded profile with a corresponding peripheral wall structure. The height (H) is approximately equal to half the difference between the inner diameter (D) of the outer wall (2) and the outer diameter (d) of the inner wall (8), and The ribs (10) projecting into the adjacent inwardly projecting outer peripheral walls (
The partial chambers (11) bounded by the two ribs (6) of 2) are equally divided, and in this case, the number of partial chambers (11) is equal to Ribs (10)
) is equal to the number of the cooler. 2. At least one of the inner and outer peripheral walls (2, 8) is wave-shaped, and in this case, the wave crests (3) and wave troughs (5) are
The cooler according to claim 1, wherein the cooler extends parallel to the axis of the inner and outer circumferential walls. 3. Cooler according to claim 1, wherein the outer circumferential wall (2) and the inner circumferential wall (8) are correspondingly corrugated with respect to each other. 4. The average thickness of the ribs (6, 10) is the same as that of the inner and outer peripheral walls (2, 8
2. A cooler according to claim 1, wherein the wall thickness of the cooler is smaller than the wall thickness of the cooler. 5. The annular chamber bounded by both peripheral walls (2, 8) is radially partitioned by ribs (6) or (10), the free ends of the ribs (6, 10) or
5. A cooler according to any one of claims 1 to 4, wherein the corners each protrude into the same circumferential depression forming the wave, towards which it extends. 6. For the front side closure of the coaxially lying tubes (1, 7), in a manner known per se, a closure cap (15) with a central opening (18) closes the partial chamber (11). ) is provided with an annular chamber (19) connecting the annular chambers (19), to which is connected an annular chamber (20) which is open on one side, and whose peripheral outer boundary The wall (23) corresponds to the external contour of the outer tube (1), and the inner boundary wall (24) on the peripheral side thereof is formed corresponding to the internal contour of the inner tube (7). , this annular chamber (20) is connected to both tubes (1
, 7) and is connected thereto, preferably glued. 7. Inner annular chamber (19) connecting partial chambers (11)
7. A cooler according to claim 6, wherein the axial extension of ) is greater than its radial extension. 8. A connecting nipple is connected to the inner annular chamber (19), or the annular chamber (19) is laterally shaped and has a connecting branch tube (26). Cooler as described in section. 9. Cooler according to claim 6, 7 or 8, wherein the closure cap (15) is made of a synthetic resin material or of metal, in particular aluminum. 10. The region (16) of the closure cap (15) having an annular chamber (20) open to the outside is connected to an inner annular chamber (20).
7. A cooler according to claim 6, wherein the area (17) has a larger outer diameter than the area (17) having the area (19). 11. The occlusion cap (15) is arranged around the periphery, preferably:
11. Cooler according to claim 10, characterized in that the portion (16) having a larger diameter has webs (30) directed radially outward. 12, both annular chambers (19, 2) of the closure cap (15)
0) transition into each other via the lateral and medial shoulders (25), which shoulders (25) intersect with the occlusion cap (15).
) in the correct configuration of the function forms a stop for the front corner of the tube (1, 7).
The cooler according to any one of Item 1. 13. In the end portion, the internal rib (6) of the outer circumferential wall (2) and the external rib (10) of the inner circumferential wall (8) are separated, and on the front side, the inner circumferential wall (8) ) is expanded as follows and (or) the outer circumference (2) is compressed as follows,
That is, the inner and outer circumferential walls are in contact with each other on the front side, and both the inner and outer circumferential walls are connected (welded, brazed, or bonded) to each other at the front side. Cooler described in. 14. Claims in which the waves are caused by expansion or compression of the end portions of the inner circumferential wall and/or the outer circumferential wall, and the waves of the mutually joined circumferential walls engage with each other in a tooth-like manner. The cooler according to item 13. 15. According to any of claims 1 to 5, the average width (b) of the subchamber (11) bounded by two adjacent ribs (6, 10) is approximately 0.2 mm. cooler.