SEALING DIAPHRAGM AND CHECK VALVE HAVING A SEALING DIAPHRAGM FOR FLUID TECHNOLOGY APPLICATIONS

Abstract

The disclosure relates to a sealing diaphragm and a check valve comprising a sealing diaphragm for fluid technology applications. A sealing diaphragm for fluid technology applications is to be provided, which is economical and constructionally simple to produce, which can be used as a closing means for a check valve and with which unwanted interfering noise can be prevented during operation. The object of the disclosure is achieved by a sealing diaphragm with a flat, flexible sealing section, which can be bent or curved with a fluid pressure, wherein at least one resilient frictional tooth is provided on or next to the surface of the sealing section at a distance from an edge of the sealing section, designed and arranged in such a way that it forms an angle between 30° and 150° with the sealing section and it tilts together with the bending or curving movement of the flat sealing section, wherein the frictional tooth has a contact surface on a side orientated in the tilting direction. The object of the disclosure is also achieved by a check valve for fluid technology outlet openings, comprising a housing part having a fluid outlet, wherein an above-mentioned sealing diaphragm is arranged in the flow path of the outlet opening, which is in contact with a sealing surface of a seal seat with a sealing section against the direction of flow and which can be bent or curved with a fluid pressure in the flow direction, wherein the contact surface of the at least one frictional tooth is simultaneously in contact with a corresponding bearing surface.

Claims

1. A sealing diaphragm comprising a flat, flexurally elastic sealing section, which can be bent or bowed with a fluid pressure, wherein at least one friction tooth is formed or arranged in such a way on or next to the surface of the sealing section, at a distance from an edge of the sealing section, that it forms an angle of from 30° to 150° with the sealing section and tilts together with the bending or bowing movement of the flat sealing section, wherein the friction tooth has a contact surface on a side oriented in the tilting direction.

2. The sealing diaphragm as claimed in claim 1, having an edge region and a central region, wherein at least one sealing section is provided in the edge region or the edge region is formed continuously as a sealing section.

3. The sealing diaphragm as claimed in claim 2, in which the edge region is formed continuously as a sealing section, wherein a plurality of friction teeth is in each case formed or arranged at the same distance from the edge of the sealing section over the entire sealing section and in each case at a distance from one another.

4. The sealing diaphragm as claimed in claim 3, wherein the friction teeth are in each case formed or arranged at an equal or varying distance from one another.

5. The sealing diaphragm as claimed in claim 3, wherein it has a circular base surface and the friction teeth are formed or arranged in an annular manner.

6. The sealing diaphragm as claimed in claim 3, wherein at least one throughflow opening is formed in the central region, and a clamping or flange surface or a hollow projection is formed running around the throughflow opening.

7. A check valve for outlet openings used in fluid engineering, comprising a housing part having a fluid outlet, wherein a sealing diaphragm as claimed in claim 1 is arranged in the flow path of the outlet opening, which diaphragm rests by means of a sealing section against a sealing surface of a sealing seat against the direction of flow and which diaphragm can be bent or bowed with a fluid pressure in the flow direction, wherein the contact surface of the at least one friction tooth simultaneously comes to bear against a bearing surface corresponding to said contact surface.

8. The check valve as claimed in claim 7, having a sealing diaphragm, which is formed with a central throughflow opening, around which a hollow projection is formed, wherein the fluid outlet is formed with a corresponding hollow projection, and the sealing diaphragm can be plugged onto the latter or can be plugged into the latter, and a circular, cross-sectionally hat-shaped covering cap can be fixed on that side of the sealing diaphragm which faces away from the fluid outlet, wherein an encircling flank of the head part of the covering cap fits around the circumference of the friction teeth formed or arranged in an annular manner, and an encircling inner rim section of the covering cap forms a sealing seat having a sealing surface in that it is designed in such a way as to be inclined relative to the plane of the sealing section in the direction of the housing, with the result that the edge-side sealing section rests flush, under prestress, in a slight bending or bowing position against the inner rim section, and wherein the covering cap forms a further, outer rim section, which surrounds the inner rim section and which is formed from a toothed profile or is configured as a continuous collar having through openings and by means of which the covering cap can be fixed on or in the housing, and wherein a cavity is formed below the edge-side sealing section, into which cavity the latter can engage under fluid pressure in a bending or bowing movement, wherein the friction teeth tilt and come to bear with their contact surface against the inner side, forming the bearing surface, of the encircling flank of the head part of the covering cap.

9. The check valve as claimed in claim 8, characterized in that wherein the sealing diaphragm has a plurality of stabilizing teeth formed or arranged in an annular manner around the hollow projection in the central region.

Description

[0016] Further advantages of the invention are illustrated in greater detail below by means of the figures, together with the description of preferred exemplary embodiments of the invention. In the figures:

[0017] FIG. 1 shows a perspective view of a sealing diaphragm;

[0018] FIG. 2 shows a sectional illustration of a check valve having the sealing diaphragm according to FIG. 1 in the rest position;

[0019] FIG. 3 shows a sectional illustration of the check valve according to FIG. 2 in the actuation position with a schematic illustration of the flow path of the fluid flow;

[0020] FIG. 4 shows a sectional illustration of the check valve according to FIG. 2 in the actuation position with a schematic illustration of the bowing of the sealing section.

[0021] FIG. 1 shows the sealing diaphragm 1 in a perspective illustration. The sealing diaphragm 1 is formed from a shape-elastic elastomer and has a circular base with an outer encircling edge region 2 and an inner central region 3. The edge region 2 forms a continuous sealing section. Immediately adjacent to the surface of the sealing section formed by the edge region 2, a plurality of friction teeth is arranged in an annular manner perpendicularly to the base surface of the sealing diaphragm (and thus simultaneously perpendicularly to the plane of the sealing section formed by the edge region 2) , of which only friction tooth 4 is numbered by way of example in FIG. 1 for the sake of greater clarity. Here, the friction teeth 4 are in each case arranged at an equal distance from the outer edge of the edge region 2 forming the sealing section and at an equal distance from one another. Alternatively, the friction teeth 4 can also be arranged at a slightly varying distance from one another (not shown in FIG. 1), with the distance from the outer edge being the same in each case, as a result of which, if necessary, there is an additional moment of influence on the vibration behavior of the sealing diaphragm. A central throughflow opening 5 is formed in the central region 3. A plurality of stabilizing teeth is arranged in an annular manner around the throughflow opening 5, of which only stabilizing tooth 6 is numbered by way of example in FIG. 1 for the sake of clarity. On their flank oriented toward the outer edge, forming the sealing section, of the edge region 2, the friction teeth 4 in each case have a contact surface 7, of which, for the sake of clarity, only contact surface 7 is numbered by way of example in FIG. 1. The hollow projection 8 is designed to extend around the central throughflow opening 5.

[0022] FIGS. 2 to 4 show the check valve 9 with the sealing diaphragm 1 according to FIG. 1 in the installed position. Formed in the housing part 10 of a pneumatic valve housing is the fluid channel 11, which ends with a cylindrical opening as a fluid outlet 12. On its outside, the fluid outlet is formed with a hollow projection 13 corresponding to the hollow projection 8 of the sealing diaphragm 1. The sealing diaphragm 1 is placed with the hollow projection 8 on the hollow projection 13. Arranged on the side of the sealing diaphragm 1 which faces away from the fluid outlet 12 is the covering cap 14, which has a circular basic shape (not recognizable in the illustrations in FIGS. 2 to 4 owing to the perspective). In cross section, the covering cap has a hat shape, with a head part formed by the encircling flank 14a and the roof 14b, an encircling inner rim section 14c and an outer rim section 14d surrounding the inner rim section 14c. With the encircling flank 14a, the covering cap 14 fits around the friction teeth 4 of the sealing diaphragm 1 at the circumference (in FIGS. 2 to 4, for the sake of greater clarity, only the two friction teeth 4 are numbered by way of example). In this case, the sealing diaphragm is fixed in the central region 3 with the stabilizing teeth (in the illustrations in FIGS. 2 to 4, only stabilizing tooth 6 is numbered by way of example for the sake of clarity) in a form-fitting manner with respect to the roof 14b of the covering cap 14. The outer rim section 14d is formed from a toothed profile with gaps, although this is not apparent in the illustrations in FIGS. 2 to 4 owing to the perspective. By means of the outer rim section 14b, the covering cap is simultaneously fixed in a force-fitting and form-fitting manner in a cylindrical recess of the housing part 10 running around the fluid outlet 12, in that it is pressed into the latter.

[0023] FIG. 2 illustrates the sealing diaphragm 1 in its rest position, in which the fluid outlet 12 is not supplied. In this case, the sealing diaphragm 1 rests sealingly by means of the edge region 2 forming the sealing section against the inner side of the inner rim section 14c of the covering cap 14. Here, the inner side of the inner rim section 14c functions simultaneously as a sealing surface and sealing seat for the sealing section of the sealing diaphragm 1. Below the edge region 2 of the sealing diaphragm 1, the cylindrical recess of the housing part 10 running around the fluid outlet 12 forms a cavity 15.

[0024] FIGS. 3 and 4 show the sealing diaphragm 1 in its open position, which it assumes when the fluid outlet 12 is supplied with a sufficient pressure. The flow path of the fluid is illustrated in FIG. 3 by arrows A and B. When the fluid outlet 12 is supplied, the flow passes through the central throughflow opening 5 of the sealing diaphragm 1 (arrow A), and the fluid flow is deflected by the covering cap 14 on that side of the sealing diaphragm 1 which faces away from the fluid outlet 12 onto the encircling edge region 2 of the sealing diaphragm 1 (arrows B), which is formed continuously as a sealing section. During this process, the fluid flow passes through the gaps between stabilizing teeth 6. When a sufficient fluid pressure is applied, the shape-elastic restoring force of the edge region 2 of the sealing diaphragm 1 which forms the sealing section is overcome, as a result of which the edge region 2 rises in a bowing movement from the inner side of the inner rim section 14c of the covering cap 14, wherein it engages in the cavity 15 and opens up a flow cross section for the fluid flow. The fluid flow escapes from the cavity into the atmosphere through the exposed flow cross section, passing through the gaps between the toothed profile formed by the outer rim section 14d. The direction of the bowing movement of the edge region 2 of the sealing diaphragm 1 forming the sealing section is illustrated in FIG. 4 by the arrows C. With the bowing of the edge region 2, the friction teeth 4 simultaneously tilt and, in the process, come to bear with their contact surfaces 7 respectively oriented in the tilting direction against an inner side, forming a bearing surface, of the encircling flank 14a of the covering cap 14 and exert a frictional engagement thereon. As a result, the position of the edge region 2 of the sealing diaphragm 1 forming the sealing section is stabilized in its open position on account of the physical connection of the edge region 2 and the friction teeth 4, and unwanted vibration, oscillation or fluttering of the sealing section in the open position is prevented or at least damped to such an extent that no unwanted troublesome noises are emitted.

[0025] The check valve 9 can be produced in a structurally particularly simple and low-cost manner since, in addition to the housing part with corresponding bores, it is formed only from the sealing diaphragm 1 and the covering cap 9. In this case, the sealing diaphragm 1 can be produced simply as an elastomer part in a primary forming or forming production process. The covering cap can simply be produced as a metal part in a punching process or as a plastic part in an injection molding process.

LIST OF REFERENCE SIGNS

[0026] 1 sealing diaphragm

[0027] 2 edge region

[0028] 3 central region

[0029] 4 friction tooth

[0030] 5 throughflow opening

[0031] 6 stabilizing tooth

[0032] 7 contact surface

[0033] 8, 13 hollow projection

[0034] 9 check valve

[0035] 10 housing part

[0036] 11 fluid channel

[0037] 12 fluid outlet

[0038] 14 covering cap

[0039] 14a flank

[0040] 14b roof

[0041] 14c inner rim section

[0042] 14d outer rim section

[0043] 15 cavity