EP1181439B1 - Closing cap - Google Patents

Description

The invention relates to a cover for openings on containers, in particular on motor vehicle radiators, with a Inner cover part, the at least one flow connection between the inside of the container and the outside of the container and a valve arrangement for releasing and locking the Has flow connection, the valve assembly a first and a second reciprocable valve body comprises, wherein the first valve body by a first spring towards the inside of the container against a first one Sealing seat on the inner cover part and against a second one Sealing seat is biased to the second valve body, and the first valve body when a first is exceeded Limit value of the internal pressure of the container from the inner part of the lid as well as when a second limit of the Internal pressure of the lid inner part and the second Valve body each with the release of a flow connection can be lifted off between the inside of the container and the outside of the container is, wherein the second valve body on the The third sealing seat provided in the inner cover part is assigned against which the second valve body in a third, between the first and the second limit for the internal pressure of the tank comes to the system, whereby the previously existing flow connection between the interior of the container and the exterior of the container is locked.

Such a cover is from DE 41 07 525 C1 known. In the known sealing cap is the first Valve body a valve pot with a radially outward extending flange and as the second valve body one Valve pot concentrically surrounding cylindrical sleeve used, also with a radially outward projecting flange is provided. In the transition area to the cylindrical sleeve is the flange attached to this shaped like a bead to form a bead. In the initial locked position the valve arrangement according to the prior art the valve pot is supported by a compression spring Direction is applied to the interior of the container, via a Sealing ring on the described bead of the second Valve body. This way too cylindrical sleeve loaded with force on the inside of the container is also with its flange with the interposition of a Sealing rings stored on a sealing seat of the inner cover part. Another sealing ring connected to the inner cover part is the flange of the cylindrical sleeve in the starting locked position the valve assembly at a distance towards the container exterior opposite. For the aimed two-stage dismantling of a prevailing inside the container Overpressure are the three sealing rings described Valve arrangement of the known cover indispensable.

The object of the present invention is to provide such Simplify the closure cover constructively.

The task is with a cover for openings Containers, in particular on motor vehicle radiators, with a Inner cover part, the at least one flow connection between the inside of the container and the outside of the container and a valve arrangement for releasing and locking the Has flow connection, the valve assembly a first and a second reciprocable valve body comprises, wherein the first valve body by a first spring towards the inside of the container against a first one Sealing seat on the inner cover part and against a second one Sealing seat is biased to the second valve body, and the first valve body when a first is exceeded Limit value of the internal pressure of the container from the inner part of the lid as well as when a second limit of the Internal pressure of the lid inner part and the second Valve body each with the release of a flow connection can be lifted off between the inside of the container and the outside of the container is, wherein the second valve body on the The third sealing seat provided in the inner cover part is assigned against which the second valve body in a third, between the first and the second limit for the internal pressure of the tank comes to the system, whereby the previously existing flow connection between the interior of the container and the exterior of the container is locked, in that the second valve body in the direction of a second spring is biased to the container exterior, and that the first and the second sealing seat with a single sealing surface cooperate, which is attached to the first valve body is. This provides the advantage that instead of the state of the Technology, three sealing rings required only two sealing rings required are.

Another special embodiment of the invention is characterized in that the first and third Sealing seat on the end faces facing away from one another hollow cylindrical sleeve are formed by a Web is connected to the inner cover part. This will make one easy to manufacture variant for Creation of the first and third sealing seat provided.

Another special embodiment of the invention is characterized in that the second sealing seat is radial is arranged within the first sealing seat. The Flow paths with an overpressure inside the container can be interrupted by a single ring seal, which in Closing direction on both the first and third Fits tight.

Another special embodiment of the invention is characterized in that the third sealing seat is radial is arranged outside the second sealing seat. The Function of the third sealing seat is independent of that first and second sealing seat. Through the second sealing seat prevents overpressurized fuel reached the first sealing seat.

Another special embodiment of the invention is characterized in that the second valve body a Valve cover with a substantially cylindrical shape Form includes, on the outer surface of a step is designed, which serves as a stop for a seal, which is fixed by a sealing ring that the valve cover partially surrounds. This will make it easy to replace the Seal allows.

Another special embodiment of the invention is characterized in that the valve cover on the hollow cylindrical sleeve is guided axially. This will ensure the proper functioning of the invention Valve arrangement ensured.

Another special embodiment of the invention is characterized in that between the outer Circumferential surface of the sealing ring and the inner cover part Annular gap is formed. The annular gap forms a part the flow path for the pressurized Fuel.

The invention generally provides the advantage that one for Time used in engines with strong post-heating Cooling water circulation pump can be omitted. Such a pump The coolant will roll a few more after the engine has been switched off Time to. This will cause the coolant to "boil up" prevented.

Another special embodiment of the invention is characterized in that between the outer Outer surface of the valve cover and the inner cover part Annular gap is formed. The annular gap forms one another part of the flow path for those with overpressure charged fuel.

Figur 1

einen Verschlussdeckel für einen Kraftfahrzeugkühler mit einer Überdruck/Unterdruck-Ventilanordnung in Ausgangs-Sperrstellung gemäß einer Ausführungsform der vorliegenden Erfindung;

Figur 2

den Verschlussdeckel aus Figur 1 nach Überschreiten eines ersten Grenzwertes für einen Überdruck im Kühlerinneren;

Figur 3

den Verschlussdeckel aus Figur 1 bei einem zweiten Grenzwert für einen Überdruck im Kühlerinneren;

Figur 4

den Verschlussdeckel aus Figur 1 nach Überschreiten eines dritten sog. Sicherheitsgrenzwertes für einen Überdruck im Kühlerinneren; und

Figur 5

den Verschlussdeckel aus Figur 1 bei einem Unterdruck im Kühlerinneren.

Further advantages, features and details of the invention result from subclaims 9 and 10 and the following description, in which an embodiment of the invention is described in detail with reference to the drawing. The features mentioned in the claims and in the description can be essential to the invention individually or in any combination. The drawing shows:

Figure 1

a closure cap for a motor vehicle radiator with an overpressure / underpressure valve arrangement in the starting blocking position according to an embodiment of the present invention;

Figure 2

the closure cover of Figure 1 after exceeding a first limit for an overpressure in the interior of the cooler;

Figure 3

the closure cover of Figure 1 at a second limit for an overpressure in the interior of the cooler;

Figure 4

the cover of Figure 1 after exceeding a third so-called safety limit for an overpressure in the interior of the cooler; and

Figure 5

the cover of Figure 1 at a negative pressure in the interior of the cooler.

According to FIGS. 1 to 5, a closure cover 1 for a motor vehicle radiator one with an operating handle 2 provided outer cover part 3, on which a Inner cover part 4 is held with a valve arrangement 4. In the use position, the cover 1 is on one Radiator nozzle fixed. The inner cover part 4 protrudes Direction towards the inside of the radiator in the radiator neck. On O-ring 6 seals the inner cover part 4 against the Radiator neck wall.

The valve arrangement 5 in the interior of the inner cover part 4 comprises a first valve body 7 and a second Valve body 8. The first valve body 7 comprises one Valve plate 9, on its side facing the cooler interior a seal 10 is attached.

The valve plate 9 is on the inside of the radiator opposite side of two closing springs 11 and 12 acted upon by their from the valve plate 9th Support opposite ends on a spring plate 13. The Spring plate 13 in turn is supported on the inner cover part 4 or the outer cover part 3. By means of the closing springs 11 and 12 is the valve plate 9 toward the Prestressed interior of cooler. Over the as a flat sealing ring trained seal 10 is the valve plate 9 on a first sealing seat 14 on the inner cover part 4 and on one second sealing seat 15 mounted on the second valve body 8.

The second valve body 8 is a valve cover 16 and a sealing ring 17 is formed. The valve cover 16 has a Essentially cylindrical shape. On the outside The lateral surface of the valve cover 16 is a step 18 educated. The stage 18 forms a stop for one Ring seal 19. The ring seal 19 is through the sealing ring 17 fixed to the stage 18 of the valve cover 16. The Ring seal 19 acts with a third sealing seat 20 together. In the valve position shown in Figure 1 the third sealing seat 20 opened. By an arrow 21 is indicated that fuel pressurized from the interior of the container via an annular gap between the Inner cover part 4 and the outer peripheral surface of the Sealing ring 17, between the third sealing seat 20 and the Ring seal 19 can pass through into an annular gap, the between the valve cover 16 and a sleeve 22nd is trained.

The sleeve 22 has the shape of a circular cylinder and serves to the valve cover 16 in the event of an axial displacement to lead. The sleeve 22 is connected to the web via a web 23 Lid inner part 4 connected.

The valve cover 16 is supported by a compression spring 25 Radiator interior biased away. The valve cover 16 opposite end of the compression spring 25 is supported on a Spring plate 26, which is attached to the inner cover part 4 is. As a result of the biasing force of the compression spring 25 Valve cover 16 against the seal 10 of the first valve body 7 pressed.

An opening 27 is in the center of the valve plate 9 spared. The opening 27 in the valve plate 9 is on the to the inside of the radiator through a Vacuum valve plate 28 closed. The Vacuum valve plate 28 is by a conical compression spring 29 pressed against the valve plate 9. The inside of the cooler facing end of the conical compression spring 29 is on the Valve cover 16 of the second valve body 8 is supported.

The starting blocking position shown in Figure 1 takes Valve arrangement 5 a when the cooler pressure between a vacuum limit and a first Overpressure limit moved.

Such pressure conditions prevail at about one for vehicle parked for a long time or when driving the Vehicle and sufficient cooling of the inside of the radiator located coolant by the wind and / or with Fan support. In the initial locked position according to Figure 1 does not exist over the valve arrangement 5 Flow connection between the interior of the cooler and the Cool exterior.

If, for example, the vehicle is stopped after a long journey, then there may be an increase in pressure inside the cooler. On Because of this, the valve arrangement 5 receives cooler content and fills all free spaces upstream of the valve plate 9 out. In particular, cooler content flows as indicated by the arrow 21 is indicated, past the third sealing seat 20.

When the radiator pressure has a first overpressure limit exceeds, the valve plate 9 by the Cooler content against the action of the closing springs 11 and 12 lifted from the first sealing seat 14 on the sleeve 22. The The valve arrangement is then in the operating state according to Figure 2, in the cooler content from the inside of the cooler Cooler exterior arrives, as indicated by arrow 30. Meanwhile, the second sealing seat 15 is closed and the third sealing seat 20 opened.

If the coolant volume in after switching off the engine Consequence post-heating effect expands, so that the container volume is exceeded, this would inevitably lead to Lead coolant discharge. This undesirable effect will This prevents the pressure from rising further the valve plate 9 together with the seal 10, the Vacuum valve plate 28 and the second valve body 8 still is further lifted from the first sealing seat 18. That has with the result that the ring seal 19 through the sealing ring 17th is pressed against the third sealing seat 20. This is the Flow path, as indicated by an arrow 31 in Figure 3 is interrupted.

If the flow path is interrupted, it could be through a uncontrolled pressure increase in the cooling system to leakage The hose connection points are overstressed. These effects are caused by a second valve stage prevents the container pressure to a predetermined Limited pressure value. This pressure value is e.g. 2.0 ± 0.2 bar.

The second valve stage is through the valve hood 16 in Connection with the valve plate 9 and the seal 10 educated. When the pressure inside the cooler continues to increase and finally a third limit in the form of a Exceeds the safety limit, the Valve plate 9 together with the seal 10 of both first sealing seat 14 and from the second sealing seat 15. The resulting flow path is shown in FIG Arrow 32 indicated. The sealing cover of the valve cover 16 forms an effective area through its inner diameter, which the required locking force of 2 ± 0.2 bar. There the ring seal 19 abuts the third sealing seat and is thus limited in its axial movement, the lifts Valve plate 9 together with the seal 10 from the first Sealing seat 14 and the second sealing seat 15 and the Flow path 32 is released.

With the reduction of the excess pressure inside the cooler, the Valve arrangement 5 from its operating state according to FIG. 4 in the previously explained operating states according to Figures 2 and 3 over until it finally returns to its home locked position in accordance with FIG. 1.

If there is negative pressure inside the cooler and this falls below a predetermined negative pressure limit, so is based on the situation of Figure 1 Vacuum valve plate 28 with the second sealing seat 15 from the underside of the flat sealing ring 10 of the valve plate 9 lifted off to the inside of the radiator. The valve disc 9 is thereby by the closing springs 11 and 12 with its seal 10 on the first sealing seat 14 of the inner cover part 4 supported. The lowering of the vacuum valve plate 28 takes place against the biasing force of the compression spring 29. The itself resulting flow path is in Figure 5 by a Arrow 33 indicated.

As soon as the negative pressure inside the cooler is balanced 5, the conical compression spring 29 compressed according to FIG. 5 lifts the vacuum valve plate 28 again until the third Sealing seat 20 on the underside of the flat sealing ring 10 of the Valve plates 9 comes to the plant and again in the figure 1 Set the relationships shown.

The function of the vacuum valve plate 28 is by a fourth sealing seat 24 ensured in the Vacuum valve plate 28 is formed and with the Seal 10 cooperates. This has the advantage that the first (14), second (15) and fourth (24) sealing seat with one cooperate single seal (10).

Claims (10)

1. A closing cap for openings in reservoirs, especially in motor vehicle radiators, having a cap interior part (4), which has at least one flow connection between the interior and the exterior of the reservoir as well as a valve arrangement (5) for unblocking and blocking the flow connection, the valve arrangement (5) having a first (7) and a second valve member (8) that can move back and forth, the first valve member (7) being biased by a first spring (11, 12) in the direction of the interior of the reservoir against a first sealing seat (14) on the cap interior part (4) and against a second sealing seat (15) on the second valve member, the first valve member (7) being able to lift off when a first threshold value of the reservoir interior pressure is exceeded by the cap interior part (4) and when a second threshold value of the reservoir interior pressure is exceeded by the cap interior part (4) and by the second valve member (8), in each case permitting the unblocking of a flow connection between the interior and exterior of the reservoir, a third sealing seat (20) provided on the cap interior part (4) being assigned to the second valve member (8), the second valve member (8) coming into contact with the third sealing seat at a third threshold value that lies between the first and second threshold values for the reservoir interior pressure, as a result of which the previously existing flow connection between the interior and the exterior of the reservoir is blocked, wherein the second valve member (8) is biased by a second spring (25) in the direction of the exterior of the reservoir, and the first (14) and second (15) sealing seats cooperate with a single sealing surface (10), which is provided on the first valve member (7).
2. The closing cap as recited Claim 1, wherein the first (14) and the third (20) sealing seats are formed on the end faces of a hollow cylindrical sleeve (22), which face away from each other, the sleeve being connected to the cap interior part (4) by a bar (23).
3. The closing cap as recited in any of the preceding claims, wherein the second sealing seat (15) is arranged radially within the first sealing seat (14).
4. The closing cap as recited in any of the preceding claims, wherein the third sealing seat (20) is arranged radially outside of the second sealing seat (15).
5. The closing cap as recited in any of the preceding claims, wherein the second valve member (8) includes a valve hood (16) that has an essentially cylindrical shape, on whose exterior surface a step (18) is formed, which functions as a limit stop for a seal (19), which is fixed in place by a sealing ring (17) that partially surrounds the valve hood (16).
6. The closing cap as recited in Claim 5, wherein the valve hood (16) is guided on the hollow cylindrical sleeve (22) so as to be axially movable.
7. The closing cap as recited in Claim 5 or 6, wherein an annular gap is formed between the exterior circumferential surface of the sealing ring (17) and the cap interior part (4).
8. The closing cap as recited in Claim 7, wherein an annular gap is formed between the exterior surface of the valve hood (16) and the cap interior part (4).
9. The closing cap as recited in any of the preceding claims, wherein the first valve member (7) includes an excess-pressure valve disk (9), in which a central opening (27) is hollowed out, which is closed by a low-pressure valve disk (28), which unblocks the central opening (27) when insufficient pressure exists in the interior of the reservoir.
10. The closing cap as recited in Claim 9, wherein the low-pressure valve disk (28) is biased against the excess-pressure valve disk (9) by a third spring (29) that is supported on the second valve member (8).

Images