Seal and fluid valve

Abstract

A seal for use in a fluid control valve includes: a first, elastically deformable, plastic part; and a second plastic part configured as a hard seal element and connected to the first plastic part. The first and the second plastic parts form a seal assembly having a first frontal end configured to bear in a sealing manner on an actuatable valve body of the fluid control valve, and a second frontal end configured to bear in a sealing manner on a valve housing of the fluid control valve, wherein at least the first frontal end has a first end side having an encircling projecting bead configured to seal against the actuatable valve body.

Claims

1. A seal (4) for use in a fluid control valve (2), comprising: a first, elastically deformable, plastic part (10); at least one support element (14) configured so as to be closed in an encircling manner made from plastic and/or metal and integrated in the first plastic part (10); at least one protrusion (14.sub.r) that is part of and extends radially from a radially outer circumferential surface of the support element (14) and configured to secure the support element (14) relative to the first plastic part (10); and a second plastic part (12) configured as a hard seal element and connected to the first plastic part (10), wherein the first and the second plastic part (10, 12) together form a seal assembly (4) having a first frontal end (SE.sub.1) configured to bear in a sealing manner on an actuatable valve body (6) of the fluid control valve (2), and a second frontal end (SE.sub.II) configured to bear in a sealing manner on a valve housing (8) of the fluid control valve (2), wherein at least the first frontal end (SE.sub.I) has a first end side (S.sub.I) having an encircling projecting bead (15) configured to seal against the actuatable valve body (6).

2. The seal as claimed in claim 1, wherein the second plastic part (12) is configured in the shape of a thin-walled structure which, in the region of the bead (15), is configured to seal against the actuatable valve body (6).

3. The seal as claimed in claim 2, wherein the second plastic part (12), at least in the region of the bead (15), is molded so as to be complementary to the first plastic part (10), wherein the first plastic part (10) extends into the second plastic part (12), thereby forming the bead (15).

4. The seal as claimed in claim 3, wherein the second plastic part (12) is vulcanized onto the first plastic part (10).

5. The seal as claimed in claim 1, wherein the support element (14) is at least partially insert molded with the plastic of the first plastic part (10).

6. The seal as claimed in claim 1, further comprising at least one clearance (16) configured to fluidically increase the force of flow, the at least one clearance (16) being molded on the inside of the first plastic part (10) in relation to a seal opening (5).

7. The seal as claimed in claim 6, wherein the clearance (16) is configured so as to be closed in an encircling manner.

8. The seal as claimed in claim 7, wherein the clearance (16) is delimited by two mutually opposite lip-type, elastically deformable portions (11, 13) that fluidically increase the force of flow, said two portions (11, 13) forming an entry opening (18) for a fluid.

9. The seal as claimed in claim 1, further comprising at least one lip-type, elastically deformable portion (7) that fluidically increases the force of flow and is molded on the seal (4) on the outside toward the valve body in relation to a seal opening (5).

10. The seal as claimed in claim 9, wherein the lip-type portion (7) is configured so as to be closed in an encircling manner.

11. The seal as claimed in claim 1, wherein the first end side (S.sub.I) of the seal (4) is set at an angle to a longitudinal direction (X-X) of the seal (4), in a manner corresponding to the shape of the valve body (6).

12. The seal as claimed in claim 11, wherein the first end side (S.sub.I) encloses an angle of about 45° to 75° with the longitudinal direction (X-X).

13. The seal as claimed in claim 1, wherein the seal (4) is formed in a toroidal or at least substantially toroidal manner.

14. The seal as claimed in claim 1, wherein the second plastic part (12) as the hard seal element is made of a PTFE plastic.

15. A fluid control valve having at least one seal (4) as claimed in claim 1 for sealing off a connection region of the fluid control valve (2).

16. The fluid control valve as claimed in claim 15, configured as a selector control valve.

17. The fluid control valve (2) as claimed in claim 16, configured as a cooling water control valve.

18. The fluid control valve as claimed in claim 17, wherein the fluid control valve (2) is configured as a cooling water control valve of a vehicle.

19. The seal as claimed in claim 1, wherein a cross section of the at least one support element (14) and the at least one protrusion (14.sub.r) is T-shaped.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention will be described in more detail in the following text with reference to the illustrations in the figures. Further advantageous developments of the invention can be gathered from the following detailed description of a proposed embodiment. In the drawings:

(2) FIG. 1 shows a sectional illustration of an embodiment of a seal proposed according to the invention, in a fluid control valve;

(3) FIG. 2 shows an enlarged illustration of the embodiment shown in FIG. 1;

(4) FIG. 3 shows a perspective illustration of the support element shown in FIGS. 1 and 2;

(5) FIG. 4 shows a perspective sectional illustration of the embodiment shown in FIGS. 1 and 2;

(6) FIG. 5 shows a plan view and a perspective view of the support element; and

(7) FIG. 6 shows a perspective illustration of the seal shown in FIGS. 1, 2, and 4.

DETAILED DESCRIPTION OF THE PRESENTLY PREFERRED EMBODIMENTS

(8) FIG. 1 and FIG. 2 is a sectional illustration of a fluid control valve 2 which is provided for use as a cooling water control valve in a vehicle. The fluid control valve 2 herein can function as a mixing valve or a distribution valve. A toroidal, integral seal 4 in the fluid control valve 2 is disposed between an actuatable valve body 6 that in portions is spherical and a valve housing 8. The seal 4 herein comprises a first, elastically deformable plastic part 10, and a second plastic part 12 configured as a hard seal, which per se in the shape of a thin plastic layer is vulcanized onto the first plastic part 10. This hard seal herein can be configured, for example, from a PTFE plastic or the like. The valve body-side end SET of the seal herein comprises an end side S.sub.I (see FIG. 6) having an encircling projecting bead 15 which interacts in a statically sealing manner with the valve body 6 and herein seals in a linear and/or planar manner.

(9) The plastic layer (part) 12 in the region of the bead 15 is furthermore shaped so as to be complementary to the plastic part 10, wherein the plastic part 10 extends into the plastic layer 12, thereby forming the bead 15.

(10) A clearance 16 that is closed in an encircling manner and fluidically increases the force is molded on an inner side of the plastic part 10, or an internal side of the plastic part 10 that is closed in an encircling manner, respectively, in relation to a seal opening 5 (see FIG. 6), the entry opening 18 of the clearance, which is closed in an encircling manner being delimited by two mutually opposite, lip-type, elastically deformable portions 11, 13 that fluidically increase the force (see FIG. 1 or FIG. 2). The valve body-side portion 13 herein on the side toward the valve body is covered by the plastic layer 12. While this plastic layer 12 per se indeed reduces the elastic deformation capability of the portion 13, this thin-walled portion 13 acts in the manner of an open and flexurally soft profile and in relation to the valve body 6 thus remains elastically deformable to an adequate degree, or demonstrably flexural about a transverse direction Z-Z, respectively, such that the portion 13 additionally supports the sealing action of the bead 15 when the fluidic pressure p.sub.a arises in a corresponding manner. The pressure p.sub.a moreover has the effect that the portion 11 at the valve housing side is elastically deformed toward the valve housing 8, or is demonstrably bent about the transverse direction Z-Z, respectively, and herein additionally supports the dynamic sealing action at the valve housing-side end SE.sub.II of the seal 4. The pressure p.sub.a positively widens the entry opening 18 and thus the clearance 16.

(11) Even though this is not shown in the illustrations of the figures, the valve housing-side end SE.sub.II of the seal 4 can comprise an end side S.sub.II having an encircling projecting bead in principle which interacts in a dynamically sealing manner with the valve housing 8 and herein seals in a linear and/or planar manner.

(12) Furthermore, a lip-type, elastically deformable portion 7 that fluidically increases the force is molded in a closed encircling manner on the seal 4 on the outside toward the valve body in relation to the seal opening 5, the portion 7 per se on the side toward the valve body being covered by the plastic layer 12. It applies herein to the portion 7 in a manner analogous to that of portion 13 that while the plastic layer 12 per se indeed reduces the elastic deformation capability of the portion 7, this portion 7 that acts in the manner of a thin-walled, open and flexurally soft profile and in relation to the valve body 6 thus remains elastically deformable to an adequate degree, or demonstrably flexural about a transverse direction Z-Z, respectively, such that the portion 7 additionally supports the sealing action of the bead 15 when the fluidic pressure p.sub.i arises in a corresponding manner.

(13) The end side S.sub.I of the seal 4 that is toward the valve body is moreover set at an angle to the longitudinal direction X-X of the seal 4, in a manner corresponding to the shaping of the spherical valve body portion 6 (see FIG. 2 or FIG. 2, for example). The end side S.sub.I can in this case enclose an angle of about 45° to 75° with the longitudinal direction X-X, so as to facilitate the sealing action at the valve body side.

(14) Furthermore, a toroidal support 14 that is configured from metal or plastic so as to be closed in an encircling manner is integrated in the plastic part 10, the support 14 contributing toward the stability of the seal 4 (see FIG. 1, FIG. 2, or FIG. 3, for example). The support 14 herein is insert molded in a substantially complete manner with the plastic of the plastic part 10. The support 14 furthermore comprises, for example, four pin-type protrusions 14.sub.r which are disposed uniformly, that is to say so as to be mutually offset by 90°, across the circumference of the support 14, the pin-type protrusions 14.sub.r in relation to the seal opening 5 projecting radially outward from the support 14 on the radially outer side, or on an encircling external side of the support 14. With the exception of the end side of the free end of the respective protrusion 14.sub.r, the support 14 is completely insert molded from the plastic of the plastic part 10, or is completely integrated in the plastic part 10, respectively, wherein the respective end side terminates so as to be at least substantially flush with the external side of the plastic part 10, for example. These pin-type protrusions 14.sub.r herein function to secure the support 14 relative to the plastic part 10. Besides the rectangular cross-sectional shape of the support 14 illustrated in the figures (see FIG. 4, for example), other cross-sectional shapes such as, for example, a circular or a triangular cross-sectional shape are also conceivable in principle. A desired spring rate of the plastic part 10 can also be set by way of a corresponding choice of the cross-sectional shape, and the elastic behavior of the seal 4 can thus be influenced.

(15) Although exemplary embodiments have been explained in the above description, it should be noted that a large number of modifications are possible. It should also be noted that the exemplary embodiments represent merely examples which are not intended to limit the scope of protection, the applications and the structure in any way. Rather, a person skilled in the art will take from the above description a guideline for implementation of at least one exemplary embodiment, wherein various modifications may be made, in particular with regard to the function and arrangement of the described components, without departing from the scope of protection as can be gathered from the claims and these equivalent feature combinations.