Unit for the regulation or control of a fluid pressure

Abstract

A unit (10) for the regulation or control of a fluid pressure, having at least one housing section (13, 14) and a switching film (22) connected to the at least one housing section (13, 14) for switching at pressure differentials relative to an ambient pressure acting on the switching film (22), and for the regulation, release or blocking of a flow of the fluid between an inlet (28) and a discharge (30) for the fluid. The switching film (22) is made out of a polymer material having fluorine and carbon, in particular a thermoplastic having fluorine and carbon. In this arrangement, a hole cross-section (40) of the at least one housing section (13, 14) is closed off by the switching film (22).

Claims

1. A regulation unit for the regulation or control of a fluid pressure, comprising: a regulation housing having: at least one housing section; a fluid inlet port; a fluid discharge port; a switching film connected to the at least one housing section and adapted to switch at pressure differentials of 1 to 250 mbar relative to an ambient pressure acting on the switching film; wherein the switching film is adapted for regulation, release or blocking of a flow of the fluid between the inlet port and the fluid discharge port; wherein the switching film is made out of a thermoplastic or a polymer material having fluorine and carbon, wherein a first housing section of the at least one housing section has a first chamber, the first housing section having a hole through which the first chamber opens to an exterior of the first housing section, the hole having a hole cross-section; wherein the hole cross-section of the at least one housing section is closed off by the switching film.

2. The regulation unit according to claim 1, wherein at least one circumferential mating surface situated radially to the outside and radially surrounding the hole cross-section; wherein the switching film is fixedly and fluid-tightly connected to the at least one housing section and closing off the hole.

3. The regulation unit according to claim 2, wherein the switching film has a joining region positioned radially to the outside of the switching film; wherein the joining region is pressed in a fluid tight manner onto the at least one circumferential mating surface of at least one housing section.

4. The regulation unit according to claim 2, wherein the at least one circumferential mating surface is formed of the at least one housing section is formed conically, curved or undulated such that the at least one circumferential mating surface is self-adjust for mating.

5. The regulation unit according to claim 3, wherein the least one circumferential groove is radially delimited on the inside by an edge for supporting the switching film when there are axial movements of the switching film transverse to the hole cross-section; wherein the edge is provided radially inside the at least one circumferential mating surface of the at least one housing section; wherein two axial opposing and/or radially offset grooves are provided with the edge.

6. The regulation unit according to claim 5, wherein the at least one housing section is two housing sections; wherein each of the two housing section has the circumferential mating surface, the circumferential mating surfaces adapted to align for mating; wherein the two housing sections are the first housing section and a second housing section; wherein the second housing section has a second chamber; wherein the first chamber is separated from the second chamber in a fluid-tight manner by the switching film.

7. The regulation unit according to claim 6, wherein the joining region of the switching film between the circumferential mating surfaces of the two housing sections is arranged in a fluid-tight, compressed manner with when regulation housing is closed.

8. The regulation unit according to claim 7, wherein the joining region is arranged by a leader element in a fluid-tight, pressed-on manner at one of the circumferential mating surfaces.

9. The regulation unit according to claim 8, wherein the leader element is arranged on a side of the switching film that faces away from the fluid.

10. The regulation unit according to claim 6, wherein the two housing sections are connected radially outside of the circumferential mating surface through screwing, clamping, or welding of the two housing sections.

11. The regulation unit according to claim 1, wherein the material of the switching film comprises: polytetrafluoroethylene, or polytetrafluoroethylene with admixtures, or thermoplastically processable polytetrafluoroethylene.

12. A method of forming a fluid-tight connection of a switching film onto at least one housing section of a regulator housing of a regulation unit according to claim 1, comprising the steps of: providing a switching film formed from a polymer material having fluorine and carbon, the switching film having a connecting element on at least one side of the switching film; wherein the joining region of the switching film is situated radially to the outside of the switching film; providing a first housing section having a first chamber, the first chamber surrounded by a mating surface of the first housing section; providing a second housing section having a second chamber, the second chamber surrounded by a mating surface of the second housing section; placing the switching film onto one of the housing sections with the joining region positioned over the mating surface; pressing of the joining region onto the mating surface by the leader element.

13. The method according to claim 12, wherein after the step of placing the switching film, the method further includes: applying the second housing section onto joining region of the switching film; closing the first housing section against the second housing section, compressing the switching film a region of the joining region.

14. The method according to claim 13, wherein the closing step includes the step of: connecting the first housing section onto the second housing section in a region radially outside of the mating surfaces by: screwing, clamping, or welding the first housing section onto the second housing section.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Further advantages arise from the following drawing description. Embodiments of the invention are illustrated in the drawings. The drawings, the description and the claims contain numerous features in combination. A person skilled in the art will also expediently consider the features on an individual basis and combine them into other appropriate combinations.

[0045] Shown by way of example are:

[0046] FIG. 1 a unit having a switching film made from a polymer with fluorine and carbon according to an exemplary embodiment of the invention in a sectional view;

[0047] FIG. 2 a unit having a switching film according to an additional exemplary embodiment of the invention in a sectional view;

[0048] FIG. 3 a unit having a switching film according to a next exemplary embodiment of the invention in a sectional view showing the switching film in a non-compressed state;

[0049] FIG. 4 the unit from FIG. 3 with a welded housing in a sectional view;

[0050] FIG. 5 a detail of the unit's joining region from FIG. 3 in a sectional view showing the switching film in a non-compressed state;

[0051] FIG. 6 a detail of the unit's joining region from FIG. 4 with pressed-on film;

[0052] FIG. 7 a simplified detail of the joining region of a unit according to another exemplary embodiment of the invention with a housing section in a sectional view showing the switching film in a non-compressed state;

[0053] FIG. 8 a simplified detail of the unit's joining region from FIG. 7 in a sectional view showing the switching film in a compressed state;

[0054] FIG. 9 a schematic representation of a joining region with a switching film compressed with a flexible leader element according to another exemplary embodiment of the invention;

[0055] FIG. 10 a schematic representation of a joining region with a radially clamped switching film according to another exemplary embodiment of the invention;

[0056] FIG. 11 a schematic representation of a joining region with housing sections connected with screws according to another exemplary embodiment of the invention;

[0057] FIG. 12 a schematic representation of a joining region with a clamped switching film according to another exemplary embodiment of the invention;

[0058] FIG. 13 a schematic representation of a joining region with a clamped switching film according to another exemplary embodiment of the invention;

[0059] FIG. 14 a schematic representation of a joining region with a switching film clamped by a corner segment according to another exemplary embodiment of the invention;

[0060] FIG. 15 a schematic representation of a joining region with a switching film clamped by a corner segment according to another exemplary embodiment of the invention.

DETAILED DESCRIPTION

[0061] The same or similar components in the figures are referenced with same reference characters. The figures merely show examples and are not intended to be restrictive.

[0062] FIG. 1 shows a sectional view of a unit 10 for the regulation or control of a fluid pressure using a switching film 22 made from a polymer having fluorine and carbon according to an exemplary embodiment of the invention. The polymer material having fluorine and carbon is thus polytetrafluoroethylene or polytetrafluoroethylene with admixtures or thermoplastically processable polytetrafluoroethylene particularly in a spraying process. The unit 10 serves for regulation or control of a fluid pressure, in particular for application for pressure regulation of an internal combustion engine and/or for the pressure regulation of a crankcase of an internal combustion engine. The unit 10 has a housing 12 having a first housing section 13 and a second housing section 14, the housing cover, wherein the first housing section 13 has an inlet 28 and a discharge 30 for the fluid. The switching film 22 is formed from a polymer film having fluorine and carbon, for example PTFE, and is clamped with a joining region 42 between first housing section 13 and the second housing section 14.

[0063] The hole cross-section 40 of the two housing sections 13, 14 is sealed by the switching film 22 with its functional region. Two circumferential mating surfaces 50, 52 are provided situated radially to the outside on the two housing sections 13, 14, at which the switching film 22 is connected fluid-tight to the two housing sections 13, 14. In the exemplary embodiment shown, a joining region 42 of the switching film 22 radially situated on the outside is pressed onto the mating surfaces 50, 52 of the two housing sections 13, 14 in a fluid-tight manner. The exemplary embodiments in FIGS. 1 and 2 show a diagram of the header elements 44. Details about the tensioning of the switching film 22 by the leader elements 44 are provided in FIGS. 9 to 15.

[0064] The switching film 22 separates a first chamber 36 of the unit 10 from a second chamber 38 in a fluid-tight manner. There is a pressure differential between the first chamber 36 and the second chamber 38, wherein the second chamber 38 is connected (not depicted) to the surrounding space, meaning to the atmosphere. The switching film 22 can be moved with pressure differences of 1 to 250 mbar, preferably from 1 to 100 mbar, and serves to release or shut off a through-flow of the fluid between the inlet 28 and the discharge 30. The inlet 28 of the unit 10 is fluidically connected during use to, for example, the crankcase of an internal combustion engine, while the discharge 30 is fluidically connected to the breather line. The switching film 22 has a plate-like flat body 16 having a corrugated bending region 18 surrounding a central sealing region 24. The bending region 18 moves during switching of the switching film 22 by a low-strain, in particular strain-free bending motion of the sealing region 24 with respect to a valve seat 32 in an axial direction L toward the valve seat 32 or away from the valve seat 32. For this, the switching film 22 has at least in the bending region 18 a thickness of at most 0.5 mm, preferably of at most 0.3 mm, most preferably of at most 0.2 mm. The diameter of the switching film 22 can thus be between 40 mm and 100 mm, preferably between 50 mm and 80 mm.

[0065] The bending region 18 extends in a wave-like manner in radial direction around sealing region 24, wherein a recess on a flat side corresponds to an elevation on the other flat side of the switching film 22. The sealing region 24 seals the valve seat 32 if it is located on the valve seat 32. A spring element 26 is provided that is supported at the first housing section 13 which exerts a force on the sealing region 24 of the switching film 22. The spring element 26 is supported here by an annularly formed plate 34 at the sealing region 24. The sealing region 24 is formed as a bowl-shaped projection 20 of the switching film 22, wherein the plate 34 in the form of a support ring annularly encloses this projection. The spring element 26 can alternatively engage the switching film 22 without plate 34 and thus be sprayed on its end face that is turned towards the projection 20 for protection of the switching film 22, so that the encapsulation can replace the plate 34.

[0066] A groove 54, 56 running radially is provided inside the mating surface 50, 52 of each of the two housing sections 13, 14, which is delimited radially inside by an edge 58, 60 for supporting the switching film 22 during axial movements transverse to the hole cross-section 40. The two grooves 54, 56 are located axially opposite one another. Because the switching film 22 is located on the rounded edges 58, 60 and is clamped between them, the switching film 22 is protected against excessive wear and damages from sharp edges resulting from axial movements of its working region because of the regulating function of the unit 10.

[0067] FIG. 2 shows in a cross-sectional view a unit 10 having a switching film 22 according to an additional exemplary embodiment of the invention. The basic design of the unit 10 essentially corresponds to the exemplary embodiment in FIG. 1. The mating surfaces 50, 52 of the two housing sections 13, 14, however, are formed conically in the longitudinal direction L. In this manner, the switching film 22 can advantageously be centered during the joining of the switching film 22 at the first housing section 13 and during assembly of the housing 12 by placement of the second housing section 14. The grooves 54, 56 with their edges 58, 60in contrast to the embodiment in FIG. 1 where they are arranged axially opposedare arranged in this case radially displaced, which can also be beneficial for the support of the switching film 22 during the axial movement of the switching film 22.

[0068] FIG. 3 shows a unit 10 having a fluid-tight, pressed-on switching film 22 according to a next exemplary embodiment of the invention in a sectional view. The spring element 26 was left out to provide greater clarity. FIG. 5 shows a detail of the housing 12 of unit 10 from FIG. 3 with the joining region 42.

[0069] In comparison with the two exemplary embodiments in FIGS. 1 and 2, the unit 10 in FIG. 3 does not have any grooves 54, 56. The switching film 22 is mounted between the two housing sections 13, 14 in a fluid-tight manner. Lips 58, 60 with a rolling radius to relieve the switching film 22 are provided.

[0070] A radial, external joining area 42 of the switching film 22 is pressed in the area of the joining areas 50, 52 in a fluid-tight manner onto the first housing section 13 by applying the switching film to the housing section 13 with the joining region 42 onto the mating surface 50 and pressing the joining region 42 against the mating surface 50, 52 with a leader element 44, for example an O-ring. Advantageously, the switching film 22 in this arrangement, at least in the region of the joining region 42, may have an activated surface with altered surface tension in order to achieve good tightness, wherein the joining region 42 is prepared, for example, by one of the methods, etching, plasma treatment, mechanical roughening, embossing or perforation. After the seating of the switching film 22 on the at least first housing section 13 with the joining region 42 over the mating surface 50, a second housing section 14 is seated on the switching film 22 and thus forms the housing 12. The joining region 42 of the switching film 22 is compressed during the sealing of the housing 12 in the region of the mating surfaces 50, 52.

[0071] FIG. 4 shows the unit 10 from FIG. 3 with the welded housing 12. FIG. 6 shows a detail of the housing 12 of unit 10 from FIG. 4 with the joining region 42.

[0072] The housing 12 is preferably sealed to a radial outer circumference after the insertion and slight pre-compression of the switching film 22 by the leader element 44 by welding. To this purpose, at least one housing section 13, 14 is formed radially outside the mounting surface 50, 52 for closure of the hole cross-section 40 through welding. In this regard, the first housing section 13 has a circumferential lip 66, which is to be welded with the second housing section 14.

[0073] Compared to the details shown in FIGS. 5 and 6, it becomes clear that the two housing sections 13, 14 are kept at a distance from each other by the circular lip 66 of the first housing section 13 directly after the application of the switching film 22 and placement of the second housing section 14, which does not disappear until after the two housing sections 13, 14 are welded together by the melting of the material, so that this way the two housing sections 13, 14 lie tightly on top of each other and the switching film 22 is firmly compressed between them. The leader element 44 is increasingly compressed by the pressure on the two housing sections 13, 14 when the distance between the two housing sections 13, 14 is adjusted during the welding process. The melted material of the lip 66 can flow from both sides of the lip 66 as the welding bead.

[0074] The two FIGS. 7 and 8 show a simplified detail of the joining region 42 of a unit 10 according to another exemplary embodiment of the invention with a housing section 13 in a sectional view showing the switching film 22 in a non-compressed state;

[0075] In this embodiment, the leader element 44 is located in a groove 46, which is arranged in the mating surface 50 of the housing section 13, and is thus better fixed during the installation of the unit 10. The switching film 10 is then placed with the joining region over the leader element 44 and can therefore be pressed onto the second housing section 14 when the housing 12 is closed. The leader element 44 is then compressed in the groover 46 and can expand in the groove 46 parallel to the switching film 22 in the radial direction. FIG. 8 shows the pressed-on switching film 22 with the compressed leader element 44, but does not show the second housing section 14. Alternatively, the first housing section 13 with applied switching film 22 can be pressed onto another component of an internal combustion engine.

[0076] Alternatively, the groove 46 can be arranged in the second housing section 14 as well, so that, as in the exemplary embodiment in FIGS. 3 and 4, the leader element 44 can continue to be arranged between the switching film 22 and the second housing section 14.

[0077] FIG. 9 a schematic representation of a joining region 42 with a switching film 22 compressed with a flexible leader element according to another exemplary embodiment of the invention. The leader element 44, for example in the form of a spring, is arranged in a groove 46 in the mating surface 52 of the second housing section 14 and thus fixed for installation. The switching film 22 with its joining region 42 is located between the two housing sections 13, 14 and can thus be advantageously compressed by the leader element and the mating surfaces 50, 52 in order to achieve a fluid-tight sealing of the hole cross-section 40 and the housing 12.

[0078] FIG. 10 shows a schematic representation of a joining region 42 with a radially clamped switching film 22 according to another exemplary embodiment of the invention. Here, the switching film 22 is also compressed between the mating surfaces 50, 52 of the two housing sections 13, 14 and additionally radially clamped and held by a leader element 44 radially arranged at an outside, for example a locking ring, a hose clamp, or a snap-in hook. The leader element 44 can plunge into a radially arranged groove 46 in the first housing section 13 during the clamping process and thus compress the switching film 22 in the groove 46.

[0079] FIG. 11 shows a schematic representation of a joining region 42 with housing sections 13, 14 joined by a screw connection 68 according to another exemplary embodiment of the invention. The switching film 22 is compressed between the two housing sections 13, 14, which are joined by the screw connection 68. The screw connection 68, for example in the form of a screw with a nut as the counterpart, is guided here through an opening in the switching film 22. In this way, the switching film 22 can be reliably clamped and form a fluid-tight connection between the housing sections 13, 14 as well as the hole cross-section 40.

[0080] FIG. 12 shows a schematic representation of a joining region 42 with a clamped switching film 22 according to another exemplary embodiment of the invention. Here, the switching film 22 is clamped by a raised area 72 in the mating surface 52 of the second housing section 14, which engages in an opposing groove 46 of the mating surface 50 of the first housing section 14, and which is held there to fixate the switching film 22 while the two housing sections 13, 14 are compressed.

[0081] FIG. 13 shows a schematic representation of a joining region 42 with a clamped switching film 22 according to another exemplary embodiment of the invention. In this embodiment, the switching film 22 itself has an embossing 70 as a raised area with which the switching film 22 can be advantageously clamped between the mating surfaces 50, 52 of the two housing sections 13, 14.

[0082] FIG. 14 shows a schematic representation of a joining region 42 with a switching film 22 clamped by a corner segment according to another exemplary embodiment of the invention. The second housing section 14 protrudes here over the first housing section 13 with a radial circumferential lip, so that the switching film, when placed over the first housing section 13 and the second housing section 14 is slid on top of it, is bent in the axial direction and clamped in this manner. In this manner, a reliable, fluid-tight connection of the two housing sections 13, 14 and a sealing of the hole cross-section 40 can be achieved.

[0083] FIG. 15 shows as an expansion of the embodiment represented in FIG. 14 a schematic representation of a joining region 42 with a switching film 22 clamped by a corner segment according to another exemplary embodiment of the invention with an additional fixing. The radial circumferential rim of the second housing section 14 has an internally directed radial raised area 72, which complements a circumferential grove 46 in the first housing section 13. When the switching film 22 is placed over the first housing section 13 and the second housing section is placed on top of it, the switching film can be clamped by the raised area 72 and the groove 4, so that this way a secure fixing of the switching film 22 can be achieved.