EP1846715B1 - Stacked-plate cooler - Google Patents

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

The invention relates to a Stapelscheibenkühler for motor vehicles, with a plurality of stacked and interconnected, in particular soldered, discs, and with a running through several discs through feed channel through which the medium to be cooled is fed to the stacked disc cooler and distributed to individual discs.

The oil supply passage of a conventional stacked-plate oil cooler is supplied with oil, for example, via an oil pump. To avoid contamination in the stacked-plate oil cooler, it may be useful to filter the oil in an oil filter before it enters the oil supply passage of the stacked-plate oil cooler. From the German Utility Model DE 202 15 258 U1 An oil module for an internal combustion engine is known, in which means are provided for preventing oil return in the direction of the oil pump at standstill of the internal combustion engine and means for preventing oil return in the direction of the filling after filling with the first oil filling.

The citation US Pat. No. 5,477,817 discloses another oil module that includes a stacked disc cooler and an external valve device that also prevents oil return to the fill port.

The object of the invention is a Stapelscheibenkühler for motor vehicles, with a plurality of stacked and interconnected, in particular soldered, discs, and with a running through several discs feed channel through which the medium to be cooled is fed to the stacked disc cooler and distributed to individual discs, to create, which is inexpensive to produce and has more features than conventional Stapelscheibenkühler and is compact.

The object is in a stacked disc radiator for motor vehicles with a plurality of stacked and interconnected, in particular soldered discs, and extending through a plurality of discs feed channel through which the medium to be cooled is fed to the stacked disc cooler and distributed to individual discs, achieved in that in the supply channel, a valve device is installed, which prevents a return of the medium to be cooled from the supply channel, for example, when the pump of the motor, According to the present invention, the valve means is integrated in the stack disc cooler. As a result, the existing space in the stack disc radiator is used for an additional function. The integration of the valve device thus no additional space is needed.

A preferred embodiment of the stacked-plate oil cooler is characterized in that the valve device is formed by a non-return valve device which comprises a valve body which is held in contact with a valve seat by a valve spring device. The check valve means permits flow through the oil supply passage in one direction only and closes upon flow reversal, for example when the oil pump ceases to deliver oil.

Another preferred exemplary embodiment of the stacked-plate oil cooler is characterized in that the oil-supply channel is delimited by a cover plate on which the valve spring device is supported. According to the present invention, a conventional cover plate, which is also referred to as cover, used as an abutment for the valve spring device. This makes it possible to integrate the valve spring device in the oil supply channel, without making any structural changes to a conventional stacked-plate oil cooler.

A further preferred exemplary embodiment of the stacked-plate oil cooler is characterized in that the valve-spring device is prestressed Includes helical compression spring which is received in the oil supply passage. The length of the helical compression spring in the prestressed state corresponds approximately to the length of the oil supply channel.

A further preferred embodiment of the stacked-plate oil cooler is characterized in that the valve body comprises a substantially circular disk-shaped closing body whose outer diameter is smaller than the inner diameter of the oil supply channel. This ensures that oil can flow past the closing body when it is arranged in the oil feed channel.

Another preferred embodiment of the stacked plate oil cooler is characterized in that the closing body on the valve spring device facing away from the end face has an annular groove into which an O-ring is inserted. The O-ring serves as a sealing medium. It is also possible to provide a suitable sealing material directly on or on the closing body.

A further preferred exemplary embodiment of the stacked-plate oil cooler is characterized in that a plurality of connecting webs extend from the front side of the closing body facing the valve spring device, which connect the closing body to a guide ring. The connecting webs and the guide ring form a kind of guide cage, which serves to guide the closing body to and fro movable in the oil feed channel. In addition, the guide cage serves to receive an end of the valve spring device.

A further preferred exemplary embodiment of the stacked-plate oil cooler is characterized in that the stacking disks are arranged between the cover plate and a base plate which, in continuation of the oil feed channel, has a through-hole whose inner diameter is greater than the outer diameter of the valve body and the outer diameter of the valve spring device. As a result, the installation of the valve device through the cover plate is made possible in a simple manner.

A further preferred embodiment of the stacked-plate oil cooler is characterized in that a closure ring in which the valve seat is provided for the valve body is arranged in the through-hole in the base plate. The lock ring is inserted into the through hole after installation of the valve spring means and the valve body. Preferably, the locking ring is pressed into the base plate.

Another preferred embodiment of the Stapelscheibenölkühfers is characterized in that on the closure ring, a sealing surface or sealing edge is formed. At the sealing surface or sealing edge of the valve body is in the closed state of the valve device.

Figur 1

einen erfindungsgemäßen Stapelscheibenölkühler in der Draufsicht;

Figur 2

den Stapelscheibenölkühler aus Figur 1 in der Seitenansicht;

Figur 3

die Ansicht eines Schnitts entlang der Linie III-III in Figur 1;

Figur 4

eine Explosionsdarstellung der erfindungsgemäßen Ventileinrichtung;

Figur 5

einen zu der Ventileinrichtung gehörenden Ventilkörper in der Draufsicht;

Figur 6

die Ansicht eines Schnitts entlang der Linie VI-VI in Figur 5 und

Figur 7

eine Explosionsdarstellung des erfindungsgemäßen Stapelscheibenölkühlers.

Further advantages, features and details of the invention will become apparent from the following description in which, with reference to the drawings, an embodiment is described in detail. The features mentioned in the claims and in the description may each be essential to the invention individually or in any desired combination. Show it:

FIG. 1

a stacked-plate oil cooler according to the invention in plan view;

FIG. 2

off the stacked-plate oil cooler FIG. 1 in the side view;

FIG. 3

the view of a section along the line III-III in FIG. 1 ;

FIG. 4

an exploded view of the valve device according to the invention;

FIG. 5

a valve body belonging to the valve body in plan view;

FIG. 6

the view of a section along the line VI-VI in FIG. 5 and

FIG. 7

an exploded view of the stacked-plate oil cooler according to the invention.

In FIG. 1 a stacked-plate oil cooler 1 according to the invention is shown in plan view. The stacked-plate oil cooler 1 comprises a base plate 4 which limits the stacked-plate oil cooler 1 on one side. The base plate 4 has the shape of a rectangle, in each of whose corners a through hole 6, 7, 8, 9 is recessed. The through-holes 6 to 9 serve for fastening the stacked-plate oil cooler 1 to a motor vehicle (not shown).

On the base plate 4 opposite side of the stacked-plate oil cooler 1 is bounded by a cover plate 12. In the cover plate 12, two recesses 14, 15 are provided, which have substantially the shape of spherical sections. In addition, in the cover plate, an oil feed channel 18 and a Ölabführkanal 19 are located, which are actually not visible in plan view, but are covered by the cover plate 12. The oil supply channel 18 serves to supply oil to the stacked-plate oil cooler 1 which is cooled in the stacking disks of the stacked-plate oil cooler 1 by means of coolant or air. The Ölabführkanal 19 serves to dissipate the cooled in the stacked plate oil cooler 1 oil again. According to the present invention, a valve device 20 is disposed in the oil supply passage 18.

In the in FIG. 2 shown side view, that between the base plate 4 and the cover plate 12, which is also referred to as a cover, a plurality of stacking disks 21, 22, 23, 24 are arranged. The stacking disks 21 to 24 have the shape of stacked trough-shaped plates whose edges overlap each other and are soldered together. Between each two adjacent stacking disks hollow chambers are formed in this way, which are alternately flowed through by the media involved in the heat transfer. The medium to be cooled is preferably oil. In the stacked-plate oil cooler 1 according to the invention, however, other media can also be cooled. As a coolant is preferably water with used known additives. Instead of a liquid coolant but also air can be used to cool the oil.

In FIG. 3 is the view of a section III-III in FIG. 1 shown. In the sectional view it can be seen that in the base plate 4, a through hole 31 is provided which allows the escape of coolant from a Kühlmittelabführkanal 32. The coolant is supplied via a coolant supply channel, which under the recess 15 (see FIG. 1 ) is arranged.

You can also see in FIG. 3 in that a through hole 36 is provided in the base plate 4, the diameter of which corresponds to the diameter of the oil feed channel 18. In the through hole 36, a closure ring 38 is pressed, which has a rectangular cross-section. On the locking ring 38, a sealing surface 39 is formed for an O-ring 40. The O-ring 40 is attached to a valve body 42, which is pressed by a helical compression spring 44 against the locking ring 38. The helical compression spring 44 is clamped 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 44 form a check valve device which prevents a return flow of oil from the oil supply channel 18. The valve body 42 is pressed by the helical compression spring 44 against the locking ring 38 so that the O-ring 40 abuts the sealing surface 39 in a sealing manner. When the pressure on the valve body 42 overcomes the biasing force of the helical compression spring 44, the valve body 42 opens, so that oil passes the valve body past the oil supply passage 18. As soon as the pressure decreases, for example because a pump used for oil production is switched off, then the biasing force of the helical compression spring 44 ensures that the valve body 42 closes again.

In FIG. 4 the helical compression spring 44, the valve body 42 and O-ring 40 are shown alone in exploded view. In FIG. 4 it can be seen that the valve body 42 has a closing body 45 which essentially has the shape of a circular disk 46. From the closing body 45 go radially outside four connecting webs 51 to 54 off. The connecting webs 51 to 54 connect a guide ring 56, which has substantially the same outer diameter as the circular disc 46, with the closing body 45. The guide ring 56 and the connecting webs 51 to 54 form a kind of guide cage for the valve body 42 in the oil feed channel 18. In addition serves the guide cage for receiving the base plate 4 facing the end of the helical compression spring 44th

In FIG. 5 the valve body 42 is shown in plan view. In the plan view, the position of a section VI-VI is indicated, the in FIG. 6 is shown. In the sectional view of FIG. 6 it can be seen that an annular groove 58 is formed radially outwardly in the closing body 45 on the side facing away from the guide ring 56, which is designed to receive the O-ring 40 (see FIG FIG. 4 ) serves.

In FIG. 7 the stacked-plate oil cooler 1 according to the invention is shown in an exploded view. In this illustration, it is seen that the base plate 4 has a through hole 60 serving for supplying coolant. The locking ring 38, the O-ring 40, the valve body 42 and the helical compression spring 44 form a check valve device, which in the oil feed channel (18 in FIG. 3 ) is installed. When installing the helical compression spring 44 is first introduced together with the valve body 42 and the attached O-ring 40 in the oil supply passage. Subsequently, the locking ring 38 is pressed into the through hole 36 of the base plate 4. By the check valve means an undesirable oil return at a standstill of the oil pump is prevented. The valve body 42 may be designed as a plastic injection molded part or as a metal part, such as sheet metal part or rotary part.

In the FIGS. 1 to 7 Embodiments of a stacked disc radiator are described as stacked-plate oil cooler. However, the invention can also be used for stacked disc radiators in which another medium to be cooled is used. However, the exemplary description of the invention with reference to an oil cooler is not a limitation to this application.

Claims (12)

1. Stacked-plate cooler for motor vehicles, having a plurality of plates (21-24) which are stacked one on top of the other and are connected, in particular soldered, to one another, and having a supply duct (18) which runs through a plurality of plates and through which the medium to be cooled is supplied to the stacked-plate cooler (1) and is distributed to individual plates, characterized in that a valve device is installed in the supply duct (18), which prevents a return flow of the medium to be cooled out of the supply duct (18).
2. Stacked-plate cooler according to Claim 1, characterized in that the valve device is formed as a non-retuxn valve device which comprises a valve body (42) held in contact against a valve seat (38) by a valve spring device (44).
3. Stacked-plate cooler according to Claim 2, characterized in that the supply duct (18) is delimited by a coverplate (12) against which the valve spring device (44) is supported.
4. Stacked-plate cooler according to Claim 3, characterized in that the valve spring device (44) comprises a pre-stressed spiral compression spring which is fitted in the supply duct (18).
5. Stacked-plate cooler according to any of Claims 2 to 4, characterized in that the valve body (42) comprises a closing element (45), whose external contour in a plane perpendicular to the movement direction of the closing element substantially corresponds to the free cross-section of the supply duct, such that the closing element can fit into the supply duct.
6. Stacked-plate cooler according to any of Claims 2 to 5, characterized in that the valve body (42) comprises a substantially circular-disk-shaped closing element (45) whose outside diameter is smaller than the inside diameter of the supply duct (18).
7. Stacked-plate cooler according to Claims 5 or 6, characterized in that the closing element (45) has, on its end surface racing away from the valve spring device (44), an annular groove (58) into which an O-ring (40) is inserted.
8. Stacked-plate cooler according to Claims 5, 6 or 7, characterized in that a plurality of connecting webs (51-54) extend from the end surface of the closing element (45) which faces toward the valve spring device (44), which connect the closing element to a guide ring (56).
9. Stacked-plate cooler according to any of Claims 3 to 8, characterized in that the stacked plates (21-24) are arranged between the coverplate (12) and a baseplate (4) which has, as a continuation of the supply duct (18), a through-hole (36) whose inside diameter is larger than the outside diameter of the valve body (42) and than the outside diameter of the valve spring device (44).
10. Stacked-plate cooler according to Claim 9, characterized in that a closure ring (38) is arranged in the through-hole (36) in the baseplate (4), on which is provided the valve seat for the valve body (42).
11. Sacked-plate cooler according to Claim 10, characterized in that a sealing surface (39) or sealing edge is formed on the closure ring (38).
12. Stacked-plate cooler according to at least one of the preceding Claims 1 to 11, characterized in that the cooler is an oil cooler, the medium to be cooled is oil, and the supply duct is an oil supply duct.

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