Valve Body for a Valve, and Valve

Abstract

A valve body for a valve has an envelope surface with a bell-shaped cross section contour in a longitudinal direction of the valve body. The envelope surface is provided with a guide region for guiding the valve body in a valve seat and is further provided with a sealing region for contacting fluid-tightly the valve seat. The sealing region adjoins in the longitudinal direction the guide region. The bell-shaped cross section contour in the longitudinal direction from the guide region to the sealing region is open at one side and increases strictly monotonously. The valve body is formed of a thermoplastic polyhalogen olefin. A crankcase ventilation device is provided that is provided with a valve provided with such a valve body.

Claims

1. A valve body for a valve, the valve body comprising: an envelope surface comprising a bell-shaped cross section contour in a longitudinal direction of the valve body; the envelope surface comprising a guide region configured to guide the valve body in a valve seat and further comprising a sealing region configured to contact fluid-tightly the valve seat, wherein the sealing region adjoins in the longitudinal direction the guide region; wherein the bell-shaped cross section contour in the longitudinal direction from the guide region to the sealing region is open at one side and increases strictly monotonously; wherein the valve body is formed of a thermoplastic polyhalogen olefin.

2. The valve body according to claim 1, wherein the guide region is formed as a cone-shaped shaft extending in the longitudinal direction and wherein the sealing region comprises a cone-shaped sealing section, wherein the bell-shaped cross section contour, viewed in the longitudinal direction, is closed at a side of the guide region facing away from the sealing region.

3. The valve body according to claim 1, wherein the bell-shaped cross section contour further comprises a flow guiding region, wherein, for an adaptation of a flow resistance of the valve body, the flow guiding region connects the guide region and the sealing region to each other at least in sections thereof without material interruptions.

4. The valve body according to claim 3, wherein the flow guiding region comprises at least one pressure compensation opening that connects an inner side of the envelope surface with an outer side of the envelope surface and penetrates the bell-shaped cross section contour.

5. The valve body according to claim 3, wherein the flow guiding region, viewed in a radial direction of the valve body, is arranged between the guide region and the sealing region.

6. The valve body according to claim 1, wherein the sealing region comprises a cone-shaped sealing section, wherein the cone-shaped sealing section comprises a cone angle in a range between 25 degrees and 65 degrees.

7. A valve body according to claim 1, wherein a thickness of the bell-shaped cross section contour is in a range of 1/10 mm to 1 mm.

8. The valve body according to claim 1, wherein a ratio of a maximum diameter of the bell-shaped cross section contour measured in a radial direction of the valve body relative to a perpendicular distance, measured between an axial end of the guide region and a plane in which a circumferential line of an axial end of the sealing region is arranged, is in a range of 16/24 to 16/4.

9. The valve body according to claim 1, wherein the polyhalogen olefin is a polytetrafluoroethylene; a polytetrafluoroethylene comprising one or more admixtures selected from a fluoro admixture, a carbon admixture, and an oxygen admixtures; or a thermoplastically processed polytetrafluoroethylene.

10. A valve comprising: a valve housing; a valve seat arranged in the valve housing; a valve body holder arranged in the valve housing and comprising at least one fluid-permeable flow opening; a valve body arranged in the valve housing, wherein the valve body comprises an envelope surface comprising a bell-shaped cross section contour in a longitudinal direction of the valve body, wherein the envelope surface comprises a guide region configured to guide the valve body in the valve seat and further comprises a sealing region configured to contact fluid-tightly the valve seat, wherein the sealing region adjoins in the longitudinal direction the guide region, wherein the bell-shaped cross section contour in the longitudinal direction from the guide region to the sealing region is open at one side and increases strictly monotonously, and wherein the valve body is formed of a thermoplastic polyhalogen olefin; wherein the valve is configured to be transferred by a displacement of the valve body in the longitudinal direction of the valve body from a closed state into an open state: wherein, in the open state of the valve, an axial end of the sealing region is in contact with the valve body holder.

11. The valve according to claim 10, further comprising a centering grid projecting radially away from the valve seat, wherein, in the open state of the valve, an axial end of the guide region at least partially projects past the centering grid in a direction facing away from the valve body holder.

12. The valve according to claim 11, wherein, in the closed state of the valve, a flow guiding region of the valve body is at least partially in contact with the centering grid, and wherein the valve body holder further comprises at least one valve body holding arm connected to the valve housing.

13. The valve according to claim 12, wherein the at least one valve body holding arm is connected to the valve housing by welding, by press fit, or by a form fit connection.

14. The valve according to claim 12, wherein the at least one valve body holding arm is connected by a snap connection to the valve housing.

15. The valve according to claim 14, wherein the at least one valve body holding arm comprises at least one projection engaging at least one corresponding recess of the valve housing to form the snap connection.

16. The valve according to claim 14, wherein the valve housing comprises at least one projection that projects radially inwardly into an interior of the valve housing, wherein the at least one valve body holding arm is supported on the at least one projection to form the snap connection.

17. The valve according to claim 10, wherein the valve body holder comprises an axial bulge that extends at least partially circumferentially, wherein a section of the valve body is axially supported at the axial bulge of the valve body holder in the open state of the valve.

18. The valve according to claim 17, wherein the section of the valve body axially supported at the axial bulge of the valve body holder is a flow guiding region of the valve body.

19. A crankcase ventilation device comprising at least one valve according to claim 10.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Further advantages result from the following drawing description. In the drawings, embodiments of the invention are illustrated. The drawings, description, and claims contain numerous features in combination. A person of skill in the art will consider the features expediently also individually and combine them to expedient further combinations.

[0053] FIG. 1 shows a section illustration of a valve body according to the invention.

[0054] FIG. 2 shows a perspective view of the valve body according to the invention.

[0055] FIG. 3 shows a section illustration of a first embodiment of the valve according to the invention.

[0056] FIG. 4 shows a perspective view of the first embodiment of the valve according to the invention.

[0057] FIG. 5 shows a section illustration of a second embodiment of the valve according to the invention.

[0058] FIG. 6 shows a perspective view of the second embodiment of the valve according to the invention.

[0059] FIG. 7 shows a section illustration of a third embodiment of the valve according to the invention.

[0060] FIG. 8 shows a perspective view of the third embodiment of the valve according to the invention.

[0061] FIG. 9 shows a section illustration of a fourth embodiment of the valve according to the invention.

[0062] FIG. 10 shows a perspective view of the fourth embodiment of the valve according to the invention.

[0063] FIG. 11 shows a perspective view of a valve body holder.

[0064] FIG. 12 shows a perspective view of a further valve body holder.

DESCRIPTION OF PREFERRED EMBODIMENTS

[0065] The Figures show only examples and are not to be understood as limiting.

[0066] FIG. 1 shows a valve body 1 according to the invention. The valve body 1 comprises an envelope surface 2 and is divided into three different functional regions. A guide region 3, a flow guiding region 4, and a sealing region 5 are provided. The valve body 1 is embodied of rotational symmetry in this context. It is embodied open at one side in regard to its cross-section contour from the guide region 3 to the sealing region 5; the cross section contour strictly monotonously increases in this longitudinal direction of the valve body 1. The valve body 1 comprises thus (substantially) a bell-shaped cross section contour. It can be seen also in this context that in the illustrated embodiment the guide region 3 is embodied as a cone-shaped shaft; the sealing region 5 comprises a cone-shaped sealing section 6. In the illustrated embodiment, the three functional regions 3, 4, 5 adjoin each other without material interruption, wherein the flow guiding region 4 connects the guide region 3 with a sealing region 5. At an axial end of the guide region 3 that is facing away from the flow guiding region 4, the cross-section contour is of a closed configuration. The flow guiding region 4 is positioned in particular, viewed in radial direction, between the guide region 3 and the sealing region 5. In axial direction, the flow guiding region 4 is also positioned between the guide region 3 and the sealing region 5 because the bell-shaped cross section contour of the valve body in the longitudinal direction is embodied indeed so as to strictly monotonously increase.

[0067] FIG. 2 shows a perspective view of the valve body 1 according to the invention.

[0068] FIG. 3 shows a first embodiment of a valve 7 according to the invention with the valve body 1. The valve 7 comprises, in addition to the valve body 1, a valve housing 8 in which the valve body 1 is arranged adjacent to a valve seat 9. The valve 7 is illustrated in a closed state.

[0069] In this closed state, the guide region 3 (in the form of the cone-shaped shaft) projects, on the one hand, past the valve seat 9 at least partially with an axial end. On the other hand, the guide region 3 projects also with the axial end at least partially past a centering grid 10. The centering grid 10 is embodied to project away from the valve seat 9 in a radial direction of the valve housing 8 toward its longitudinal center axis. It surrounds the guide region 3 and follows its envelope surface 2. Accordingly, centering of the valve body 1 on the valve seat 9 is achieved. The valve body 1 comprises a defined initial position in relation to the valve seat 9. This enables, on the one hand, a permanent centering of the valve body 1 in relation to the valve seat 9. On the other hand, it also enables centering of the valve body 1 for all conceivable installation positions of the valve 7 that comprises the valve body 1; centering can be achieved for vertical or horizontal or other installation positions in relation to the direction of the force of gravity. Moreover, the centering grid 10 also has another function in addition to centering. It protects the valve body 1. In case the vacuum becomes too large in the valve 7, a “pulling through” of the valve body 1 through the valve seat 9 by plastic deformation upon closing of the valve 7 must be avoided. The centering grid 10 serves this purpose in that, in a closed state of the valve 7, it comes into contact (at least partially) with the flow guiding region 4 of the valve body 1. A plastic deformation of the valve body 1 is prevented. The centering grid 10 supports the valve body 1 in the blocking direction of the valve 7. Accordingly, guiding and centering of the valve body 1 in the valve 7 is achieved by the guide region 3.

[0070] In the closed state, moreover the sealing region 5 is contacting the valve seat 9. In this contact position, the sealing region 5 seals by means of the cone-shaped sealing section 6 against the corresponding sealing line of the valve seat 9.

[0071] It can also be seen in FIG. 3 that a valve body holder 11 is provided in the valve 7. This valve body holder 11 comprises at least one fluid-permeable flow opening 12 and at least one valve body holding arm 13.

[0072] The valve body holder 11 serves for centering and stroke limitation of the valve body 1. In an open state of the valve 7, an axial end of the sealing region 5 is contacting the valve body holder 11. The valve body 1 is secured against loss and is centered and held in a defined initial position. At the same time, due to the distance between the valve seat 9 and the valve body holder 11, the stroke of the valve body 1 is determined. In this context, the diameter of the valve body 1 at its axial end that is facing the valve body holder 11 is embodied slightly larger than the diameter of the valve seat 9. In this way, the pressure difference in the valve 7 can be kept low.

[0073] The fluid-permeable flow opening 12 serves for drainage of oil.

[0074] The valve body holder 11 illustrated in FIG. 3 is fastened by means of a snap connection in the valve housing 8. During mounting, the valve body holder 11 is pushed into the valve housing 8 until a projection 14 of the valve body holding arm 13 locks in a corresponding recess 15 of the valve housing 8.

[0075] In FIG. 4, a perspective view of the embodiment of FIG. 3 is illustrated.

[0076] FIGS. 5-10 show different embodiments of the valve body holder 11, respectively.

[0077] In FIG. 5, similar to FIG. 3, the valve body holding arm 13 is shown with the projection 14 which engages the recess 15 of the valve housing 8. The recess 15 is however embodied here as a through recess 15 in the valve housing 8.

[0078] In FIG. 6, as perspective view of the embodiment of FIG. 5 is shown.

[0079] In FIG. 7, it is illustrated that the valve body holding arm 13 can be fastened also by welding at the valve housing 8. Here, friction welding and ultrasonic welding are conceivable, for example.

[0080] In FIG. 8, a perspective view of the embodiment of FIG. 7 is illustrated.

[0081] In FIG. 9, a projection 16 that extends circumferentially in circumferential direction is formed in the valve housing 8 on which the valve body holding arm 13 is supported and which thus forms the snap connection.

[0082] In FIG. 10, a perspective view of the embodiment of FIG. 9 is illustrated.

[0083] In FIG. 11, a slightly modified valve body holder 11 is illustrated which is suitable for use in the herein described embodiments of valves. The valve body holder 11 comprises in addition to the valve body holding arms 13 for attachment in the valve housing a central bulge 17 which extends completely about the circumference and provides a contact surface for the valve body in an open valve state, wherein the valve body in particular is contacting the bulge 17 with its flow guiding region. Due to the axial bulge 17, a further contact surface for the valve body at the valve body holder is thus created which in the open valve state (against a pressure loading) can better dissipate the acting forces. Inner deformations of the valve body are minimized in this way so that an improved fatigue behavior is achieved, in particular an improved vibration resistance, for example, after several millions of load cycles. The axial bulge 17 comprises a shape tapering toward its free end. Moreover, the axial bulge 17 comprises at least one centrally arranged flow opening for a media flow.

[0084] In the further embodiment of FIG. 12, support webs 18 are provided, here three pieces, in addition to the axial bulge 17 and are arranged distributed about the circumference of the valve body holder 11. The support webs 18 extend axially from an outer circumference of the valve body holder 11 and are positioned in radial direction outwardly of the axial bulge 17. The support webs 18 are configured to guide the valve body in radial direction during its stroke and to prevent its tilting.