CN101107491A

CN101107491A - Folding piece type cooler

Info

Publication number: CN101107491A
Application number: CNA2006800029003A
Authority: CN
Inventors: 延斯·里希特
Original assignee: Behr GmbH and Co KG
Current assignee: Mahle Behr GmbH and Co KG
Priority date: 2005-01-31
Filing date: 2006-01-12
Publication date: 2008-01-16
Anticipated expiration: 2026-01-12
Also published as: CN100510602C; DE102005004520A1; US20080110605A1; WO2006081919A1; EP1846715A1; EP1846715B1; ATE430297T1; DE502006003600D1

Abstract

The invention relates to a stacked-disc cooler for a motor vehicle comprising several discs (21-24) stacked on each other and connected together, in particular welded to each other, and a supply channel which passes through several discs and through which a cooling medium is introducible into the staked-disc cooler (1) and distributed on the individual discs. According to said invention, in order to obtain the improved staked-disc cooler (1), a valve device preventing the return of the cooling medium outside of the supplying channel (18) is mounted therein.

Description

Laminated cooler

Technical Field

The invention relates to a laminated cooler for a motor vehicle, comprising a plurality of plates which are arranged one above the other and are connected to one another, in particular soldered, and comprising a supply line which runs through the plurality of plates and through which a medium to be cooled is introduced into the laminated cooler and distributed to the plates.

Background

For example, an oil inlet pipe of a conventional laminated oil cooler is supplied with oil by an oil pump. In order to avoid impurities entering the laminated oil cooler, the oil may be filtered in an oil filter before entering the oil supply pipe of the laminated oil cooler. In german utility model DE 20215258U 1, an oil module for an internal combustion engine is known, in which a device is provided for preventing oil from flowing back to the oil pump when the internal combustion engine is shut down, and a device is provided for preventing oil from flowing back to the filler neck after filling the oil through the first filler neck.

Disclosure of Invention

The object of the invention is to provide a laminated cooler for motor vehicles, comprising a plurality of plates which are arranged one above the other and are connected to one another, in particular brazed, and comprising a supply line which passes through the plurality of plates and through which the medium to be cooled is introduced into the laminated cooler and distributed to the plates. Such a laminated cooler is inexpensive to manufacture and has more functions and a compact structure than a conventional laminated cooler.

A laminated cooler for motor vehicles comprises a plurality of plates which are arranged one above the other and are connected, in particular soldered, to one another, and comprises a feed line which passes through the plates and through which a medium to be cooled is fed into the laminated cooler and distributed to the plates. In this laminated cooler, the object of the invention is achieved in that a valve element is arranged in the supply line, which prevents the medium to be cooled flowing out of the supply line from flowing back, for example when the pump of the engine is switched off. According to the invention, the valve element is integrated with the laminated cooler. This makes it possible to use the available installation space of the laminated cooler for increased functionality. The integration of the valve element thus eliminates the need for an increased installation space.

A preferred embodiment of the laminated oil cooler is characterized in that the valve element is a check valve element, which comprises a valve body, which is held in abutment against a valve seat by a valve spring element. The check valve element allows a flow through the oil inlet line in one direction only and closes when the fluid is reversed, for example when the oil pump stops supplying oil.

A further preferred embodiment of the laminated oil cooler is characterized in that the oil supply line is bounded by a cover plate on which the valve spring element is supported. According to the invention, a conventional cover plate, also referred to as cover plate, is used as a support for the valve spring element. Thus, the valve spring member can be integrated with the oil feed pipe without requiring structural changes to the conventional laminated oil cooler.

A further preferred embodiment of the laminated oil cooler is characterized in that the valve spring element comprises a preloaded helical compression spring which is mounted in the oil inlet duct. The length of the helical compression spring is substantially equal to the length of the oil feed pipe in the pre-compressed state.

A further preferred embodiment of the laminated oil cooler is characterized in that the valve body comprises a substantially disc-shaped closing body, the outer diameter of which is smaller than the inner diameter of the oil inlet duct. This ensures that when the closure is arranged in the oil inlet duct, oil can pass by it.

A further preferred embodiment of the laminated oil cooler is characterized in that the closing body has an annular groove on the end side facing away from the valve spring element, into which groove an O-ring is inserted. A suitable sealing material can also be provided directly on the closure.

A further preferred embodiment of the laminated oil cooler is characterized in that connecting strips project from the closing body towards the end face of the valve spring element, which connecting strips connect the closing body to the guide ring. The connecting strips and the guide rings form a guide sleeve for guiding the closure body to and fro in the oil supply line. The guide sleeve is also used to receive an end of the valve spring element.

A further preferred embodiment of the laminated oil cooler is characterized in that a stack of plates is arranged between the cover plate and the base plate, which are provided with through-holes continuing as oil inlet ducts, the inner diameter of the through-holes being larger than the outer diameter of the valve body and the outer diameter of the valve spring element. This makes it very convenient to be able to insert the valve element through the cover plate.

A further preferred embodiment of the laminated oil cooler is characterized in that a locking ring is arranged in the through-hole in the base plate, on which ring the valve seat of the valve body is arranged. After the valve spring element and the valve body are assembled, the locking ring is inserted into the through hole. The locking ring is preferably pressed into the base plate.

A further preferred embodiment of the laminated oil cooler is characterized in that a sealing surface or sealing edge is formed on the locking ring. In the closed state of the valve element, the valve body rests against the sealing surface or the sealing rim.

Drawings

The following description includes additional advantages, features and details of the invention. And the embodiments are explained in detail by the accompanying drawings. The features mentioned in the claims and in the description may constitute the invention here either individually or in any combination. Wherein,

FIG. 1 is a top view of a laminated oil cooler according to the present invention;

FIG. 2 is a side view of the stacked plate cooler shown in FIG. 1;

FIG. 3 is a sectional view taken along line III-III in FIG. 1;

FIG. 4 is an exploded view of a valve element according to the present invention;

FIG. 5 is a top view of a valve body belonging to the valve element;

FIG. 6 is a sectional view taken along line VI-VI in FIG. 5;

fig. 7 is an exploded view of a laminated oil cooler according to the present invention.

Detailed Description

Fig. 1 is a plan view of a laminated oil cooler 1 according to the present invention. The laminated oil cooler 1 comprises a base plate 4 which forms a boundary of one side of the laminated oil cooler. The base plate 4 is rectangular in shape and has through

holes

6, 7, 8, 9 at its corners. The through-holes 6 to 9 are used for fixing the laminated oil cooler 1 to an automobile (not shown).

On the side opposite the base plate 4, the laminated oil cooler 1 is bounded by a cover plate 12. The cover plate 12 is provided with two

recesses

14, 15 in the shape of substantially spherical sectors. In addition, the oil inlet duct 18 and the oil outlet duct 19 are drawn in the cover plate, which are not visible in the top view, but are covered by the cover plate 12. The oil inlet pipe 18 is used to feed oil into the laminated oil cooler 1, the oil being cooled by a cooling liquid or air in the laminated sheets of the laminated oil cooler 1. The oil discharge line 19 serves to discharge the cooled oil from the laminated oil cooler 1. According to the invention, a valve element 20 is arranged in the oil inlet duct 18.

As can be seen from the side view of fig. 2, a plurality of superposed

sheets

21, 22, 23, 24 are arranged between the base plate 4 and the cover plate 12 (also referred to as cover sheet). The stacked sheets 21 to 24 are shaped as trough-shaped plates stacked on top of each other, their edges overlapping each other and brazed to each other. In the above-described manner, between each two adjacent stacked plates, a cavity is formed, through which the medium taking part in the heat exchange flows alternately. The medium to be cooled is preferably oil. However, in the laminated oil cooler 1 according to the invention, other media can also be cooled. The cooling liquid is preferably water with known additives. In addition to the cooling liquid, air may also be used for cooling the oil.

Fig. 3 is a sectional view taken along line III-III in fig. 1. In the bottom plate 4, it can be seen in a sectional view, that through-holes 31 are provided which enable the coolant to flow out of the coolant discharge duct 32. The cooling liquid enters through a cooling liquid inflow duct, which is arranged below the recess 15 (see fig. 1).

In addition, it can be seen in fig. 3 that a through hole 36 is provided in the bottom plate 4, the diameter of which is equal to the diameter of the oil inlet duct 18. A locking ring 38 is pressed into the through hole 36, the ring having a rectangular cross-section. A sealing surface 39 of an O-ring 40 is formed on the locking ring 38. The O-ring 40 is mounted on a valve body 42 which is pressed against the locking ring 38 by a helical compression spring 44. A helical compression spring 44 is sandwiched between the valve body 42 and the cover plate 12.

The locking ring 38, the O-ring 40, the valve body 42 and the helical compression spring form a check valve element that prevents the oil flowing out of the oil feed pipe 18 from flowing back. The valve body 42 is pressed against the locking ring 38 by means of a helical compression spring 44, so that the O-ring 40 rests in a sealing manner against the sealing surface 39. When the pressure on the valve body 42 exceeds the pre-pressure of the helical compression spring 44, the valve body 42 opens, allowing oil to pass by the valve body into the oil inlet line 18. As soon as the pressure drops, for example after the pump for oil supply has been switched off, the pre-pressure of the helical compression spring 44 causes the valve body 42 to close again.

Only the helical compression spring 44, valve body 42 and O-ring 40 are shown in the exploded view of fig. 4. As can be seen in fig. 4, the valve body 42 has a closing body 45 which essentially has the shape of a circular disk 46. Four connecting strips 51 to 54 project radially from the outside of the closing body 45. The connecting strips 51 to 54 connect the closing body 45 to a guide ring 56, the guide ring 56 having substantially the same outer diameter as the disc 46. The guide ring 56 and the connecting webs 51 to 54 form a guide sleeve for the valve body 42 in the oil inlet duct 18. In addition, this guide sleeve serves to receive the end of the helical compression spring 44 facing the base plate 4.

Fig. 5 is a plan view of the valve body 42. The position of the section VI-VI shown in fig. 6 is marked in top view. As can be seen from the sectional view in fig. 6, on the radially outer side, an annular groove 58 is formed on the closing body 45 on the side facing away from the guide ring 56, which groove serves to receive the O-ring 40 (see fig. 4).

Fig. 7 is an exploded view of the laminated oil cooler 1 according to the present invention. In the figure, the bottom plate 4 has a through hole 60, which serves as an inflow port for the cooling liquid. The locking ring 38, the O-ring 40, the valve body 42 and the helical compression spring 44 form a check valve element that is installed into the oil inlet pipe 18 (see fig. 3). During installation, the helical compression spring 44 is first installed into the oil inlet line together with the valve body 42 and the O-ring 40 attached to the valve body. The locking ring 38 is then pressed into the through hole 36 of the base plate 4. The check valve element prevents an undesired backflow of oil in the event of a stoppage of the oil pump. The valve body 42 may be an injection molded part or a metal part such as a sheet metal part or a turned part.

The laminated cooler is illustrated in fig. 1 to 7 with the laminated oil cooler as an example. The invention is also applicable to laminated coolers for cooling other media to be cooled. The description of the present invention with reference to the oil cooler as an example does not limit the scope of applicability of the present invention.

Claims

1. Laminated cooler for motor vehicles, comprising a number of plates (21-24) which are arranged one above the other and are connected to one another, in particular brazed, and comprising a feed line (18) which runs through the number of plates and through which the medium to be cooled is fed into the laminated cooler (1) and distributed to the plates, characterized in that a valve element is arranged in the feed line (18) and prevents a return flow of the medium to be cooled which flows out of the feed line (18).

2. The laminated cooler of claim 1, characterized in that the valve element is formed by a check valve element, which comprises a valve body (42) which is held snugly against the valve seat (38) by a valve spring element (44).

3. The laminated cooler according to claim 2, characterized in that the oil feed line (18) is bounded by a cover plate (12) on which the valve spring element (44) is supported.

4. The laminated cooler of claim 3, characterized in that the valve spring element (44) comprises a pre-stressed helical compression spring which is mounted in the inlet duct (18).

5. The laminated cooler according to one of claims 2 to 4, characterized in that the valve body (42) comprises a closing body (45), wherein the outer contour of the valve body in a plane perpendicular to the direction of movement of the closing body substantially corresponds to the free cross section of the supply line, while the closing body can be inserted into the supply line.

6. The laminated cooler according to one of claims 2 to 5, characterized in that the valve body (42) comprises a substantially disk-shaped closing body (45) whose outer diameter is smaller than the inner diameter of the inlet duct (18).

7. The laminated cooler according to claim 5 or 6, characterized in that the closing body (45) is provided with an annular groove (58) on the end side facing away from the valve spring element (44), into which groove the O-ring (40) is inserted.

8. The laminated cooler according to claim 5, 6 or 7, characterized in that connecting strips (51-54) which connect the closing body to the guide ring (56) project from the closing body (45) toward the end face of the valve spring element (44).

9. The laminated cooler according to one of claims 3 to 8, characterised in that the stacked plates (21-24) are arranged between the cover plate (12) and the base plate (4) with a through-opening (36) continuing as the supply line (18), the inner diameter of which is greater than the outer diameter of the valve body (42) and the outer diameter of the valve spring element (44).

10. The laminated cooler according to claim 9, characterized in that a locking ring (38) is arranged in the through-opening (36) in the base plate (4), on which ring the valve seat of the valve body (42) is provided.

11. The laminated cooler according to claim 10, characterized in that a sealing surface (39) or a sealing edge is formed on the locking ring (38).

12. The laminated cooler according to any one of the preceding claims 1 to 11, characterised in that the cooler is an oil cooler, the medium to be cooled is oil and the inlet duct is an oil inlet duct.