DE29611998U1 - Pipe aerator for drinking water installations - Google Patents

Description

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BÖCKHORN! & PARTNER

Dipi.-lng, W. Herrmann-Trentepohl. Herne Dipl.-Phys. Klaus D. Kirschner, Munich Dipl.-lng, Wolfgang Grosse, Munich Dip!.-!ng Josef Bockhorni, Munich Dr. Christian Thiel, Dipl.-Chem., Herne Dr. jur. York-Gero v. Amsberg, RA, Munich Dipl.-!ng. Johannes Dieterle, Leipzig

Rossweiner fittings and
Measuring Instruments GmbH

0-04741 Rosswein

Leipzig

July 8, 1996

B 58646 DE (DT-gß)

Pipe aerators for drinking water installations

The invention relates to a pipe aerator in flow form for drinking water installations. Pipe aerators are used in drinking water pipes as automatic safety devices to prevent water from being sucked back into the pipe network if negative pressure occurs in the drinking water pipe.

From DE 44 04 384 Al, a pipe aerator in flow form is known for drinking water installations, in which a cylindrical ventilation insert, e.g. made of plastic, is arranged in a one-piece cylindrical metal housing with ventilation openings leading outwards at the sides, which is provided with flow channels leading from the housing inlet to the housing outlet of the pipe aerator and with a centrally arranged cylindrical closing body guide connected to a ventilation hole, in which a closing body controlled by the pressure of the water flowing through is located. The ventilation insert is pushed into the housing from the housing inlet, and its cylindrical outer

, 44100 San Sebastian, Spain.

D - 81476 Munich D - 44623 Herne D - 04109 Leipzig ES - 03002 Alicante

Tel. +49 089 - 745541 -0 Tel. +49 02323 - 95440 Tel. +49 0341 - 2 &Pgr; 3818 Tel. +49 089 - 745541 -0

Fax +49 089 - 7593869 Fax +49 02323 - 12232 Fax +49 0341 - 2113818 Fax +49 089 - 7593869

Deutsche Bank, Herne (bank code 430 700 al) Account number: 6 145 510 Bayerische Vereinsbank Munich (bank code 700 202 70) Account number: 46 505 999 Föstscheck Munich (bank code 700 100 80) Account number: 227 682 -

surface is sealed against the inner surface of the housing with elastic sealing rings. In the event of a negative pressure in the line, the closing body closes against an elastic sealing seat arranged separately in the aerator insert.

This well-known pipe aerator has the disadvantage that it has to be assembled from a large number of precision parts and its production is therefore very costly.

The object of the invention is to develop a pipe aerator in the form of a passage for drinking water installations which, while being as reliable as possible in its function, consists of only a few individual parts and can therefore be manufactured particularly cost-effectively.

The problem is solved by the characterizing features of claim 1. Advantageous embodiments of the invention are features of claims 2 to 7.

The invention will be explained in more detail below using an embodiment in conjunction with Figures 1 to 4.

Figure 1 shows the pipe aerator body in a half-side longitudinal section with the closing body inserted.

Figure 2 is a cross-section through the tube aerator body in the direction of the section line A - A in Figure 1.

Figures 3 and 4 show the pipe aerator as it is mounted at the end of a drinking water installation in the outlet opening of an outlet valve housing, whereby the sectional view in Figure 4 is rotated by 90° compared to the half-sectional view in Figure 3 in order to show the course of the

flow openings (Figure 3) and the course of the ventilation openings (Figure 4).

The pipe aerator 1, as shown as an assembly in Figures 1 and 2, comprises a pipe aerator body 2, which is designed as a precision cast part, preferably as a plastic injection molded part, with a metal threaded ring 3 firmly embedded in the injection molding compound, and the closing body 4 with a seal 5 attached to it, which is guided in the pipe aerator body 2 in a centrally arranged, cylindrical closing body guide 6 so as to be freely movable axially. The lower area of the closing body 4 has an essentially equilateral triangular cross-section, with the corners being rounded with a radius to form three cylinder wall segment-shaped sliding surfaces 20 that slide in the closing body guide 6, which is slightly reduced compared to the radius of the cylinder of the closing body guide 6 to ensure a sliding fit. The upper area of the closing body 4 comprises a cylindrical plate 21 with a flat, circular upper closing surface 17. Below the plate 21, an annular elastic seal 5 is held in a retaining groove. In the flow position, this seal rests on a seat 10 located at the upper end of the closing body guide 6.

The pipe aerator body 2 further comprises two pipe wall segment-shaped flow openings 11 that run axially through it and are arranged symmetrically to its central axis, as well as ventilation openings 15 that are arranged radially to the central axis and penetrate the pipe aerator body from the closing body guide 6 to the outside, a connection thread 19 arranged in the lower area on the outside of the pipe aerator body, e.g. for connecting hose nozzles, etc., and an external hexagon 8 for engaging a socket wrench.

The function of the pipe aerator 1 according to the invention will now be explained in more detail with reference to Figures 3 and 4.

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The pipe aerator 1 is screwed into the internal thread arranged inside the outlet opening of the outlet valve housing by adding an elastic sealing ring 7 with the external thread that is located on the metal threaded ring 3 that is firmly molded into the pipe aerator body 2. The external hexagon 8 molded onto the underside of the pipe aerator body 1 is used to tighten this threaded connection in order to pre-stress the elastic sealing ring 7. In Figure 1, the pipe aerator 1 is in the flow position, i.e. due to an overpressure present at the outlet opening of the outlet valve, the closing body is held on a seat 10 both by the gravity acting on it and by the drinking water flowing out under pressure. The water flows outwards through the two flow openings 11 (in Figure 3 only one of the two flow openings 11 is visible in the sectional view (left)) along the path of the arrows 12.

Figure 4 shows the aerator arranged at the outlet opening of an outlet valve at the end of a drinking water installation in a view similar to Figure 1, rotated by 90°. In Figure 4, the aerator is in the ventilated position, i.e. blocking the backflow of water into the drinking water installation. Due to a negative pressure that may occur in the supply line to the outlet valve, the closing body 4, which can be moved axially in the closing body guide 6, is pressed with its closing surface 17 against the seat 18 at the outlet opening of the outlet valve housing. At the same time, as the aerator body 2 is lifted, air flows into the interior of the aerator housing 2 in the path of the arrow 16. The existing water column held in place by the negative pressure breaks off at the ventilated point. Water that had already left the outlet opening cannot be sucked back into the drinking water line.

The pipe aerator according to the invention thus meets all existing regulations that prohibit the back-suction of drinking water into the drinking water installation, with a previously unattainable low level of effort.

Claims (7)

Protection claims Pipe aerator (1) in flow form, which is arranged at the end of a drinking water installation in order to prevent the back-suction of water that has left the drinking water installation, with axially running flow openings (11) leading from the pipe aerator inlet to the pipe aerator outlet, an axially arranged cylindrical closing body guide (6), an axially movable closing body (4) guided in the closing body guide with its lower area, which has an upwardly acting closing surface and a downwardly acting sealing surface in its upper area, as well as with ventilation openings (15) running from the outside of the pipe aerator into the interior of the closing body guide (6), whereby the closing body (4) enables the unhindered flow of water through the flow openings (11) in the event of excess pressure in the drinking water installation and closes the closing body guide (6) into which the ventilation holes (15) open with its downwardly acting sealing surface, and in the event of negative pressure, it closes the end of the drinking water installation with its upwardly acting closing surface (17) and opens the closing body guide (6) for the purpose of supplying atmospheric air through the ventilation openings (15) immediately below the end of the drinking water installation, characterized in that the pipe aerator (1) has an essentially one-piece pipe aerator body (2) which comprises: the flow openings (11), the closing body guide (6), a seat (10) for the lower closing body sealing surface, the ventilation openings (15) and an upper and a lower external thread (3, 19). 2. Pipe aerator according to claim 1, characterized in that an external hexagon is formed axially on the underside of the tube aerator body (2). 3. Pipe aerator according to claim 1 or 2, characterized in that the upwardly acting closing surface (17) of the closing body (4) when closing rests directly on a seat arranged at the end of the drinking water installation, e.g. in an outlet valve. 4. Pipe aerator according to at least one of the preceding claims, characterized in that the pipe aerator body {2} consists of metal and is preferably manufactured by a precision casting process. 5. Pipe aerator according to at least one of claims 1 to 3, characterized in that the pipe aerator body (2) consists of plastic and is manufactured by injection molding. 6. Pipe aerator according to claim 5, characterized in that the pipe aerator body (2) is made of plastic with one or more injected metal parts. 7. Pipe aerator according to claim 6, characterized in that the upper external thread (3) of the pipe aerator body (2) is a metal part injected into the plastic body.