EP0370281B1 - Backflow preventer for sanitary systems, especially for installation in a sanitary fitting - Google Patents

Abstract

A pipe interrupter, which is particularly suitable for installation in a sanitary fitting, comprises in a housing a chamber, into which a water-supply passage, a water-discharge passage and a ventilation path open. Located in the chamber is a rolling membrane, which is fixed at the peripheral region. Normally, thus as long as there is no reduced pressure in the supply passage, the rolling membrane bears in the central region against the opening aperture of the ventilation path in the chamber, so that on the one hand no atmospheric air may enter and on the other hand no water may escape. However, if reduced pressure occurs in the pipe system, which is connected to the supply passage, then the rolling membrane overturns so that now on the opposite side of the central region it closes the opening point of the supply passage into the chamber. On the other side, a ventilation path to the chamber is exposed. This ventilation path continues by way of a through-flow opening in the edge region of the rolling membrane towards the discharge passage. In this way, water can no longer flow back into the supply passage and into the pipe system connected thereto; on the other hand, the water-ways following the chamber are ventilated.

Description

a)

einem Gehäuse;

b)

einer Kammer im Gehäuse, in welche einmünden:

ba)

ein Zulaufkanal für Wasser;

bb)

ein Ablaufkanal für Wasser;

bc)

ein Belüftungsweg;

c)

einem elastischen Schließglied in der Kammer, welches bei Unterdruck im Zulaufkanal diesen verschließt und den Belüftungsweg öffnet.

The invention relates to a pipe interrupter for sanitary facilities, in particular for installation in a sanitary fitting

a)

a housing;

b)

a chamber in the housing into which open:

ba)

an inlet channel for water;

bb)

a drainage channel for water;

bc)

a ventilation path;

c)

an elastic closing element in the chamber, which closes the inlet duct in the event of negative pressure and opens the ventilation path.

As is well known, there are sanitary fittings that can endanger the quality of drinking water by sucking back dirty water. These include, in particular, bathtubs / shower mixers with a hose shower or washbasin and sink fittings with a pull-out hose shower. Such fittings must have safety devices with which the back suction of contaminated water into the drinking water can be reliably prevented. Such safety devices regularly include a pipe interrupter or aerator.

A pipe interrupter of the type mentioned is known from DIN 3266, July 1966, Figure 2. Here, a connector is provided coaxially to the water inlet channel in the chamber of the housing, through which radial throughflow openings for the water are passed through. An outer wall is provided coaxially to the wall of this nozzle, which contains the openings for the admission of air. The elastic closing member is designed as a hollow cylindrical part, which rests against the inner connection piece without water flow and closes the water flow openings, at the same time exposing the air openings. As soon as there is excess pressure in the inlet channel, this presses the hollow cylindrical closing member radially outward, so that on the one hand the water path into the chamber is opened and on the other hand the air supply via the radial ventilation openings is blocked.

However, this known pipe interrupter ("type A 2") is so large that it is poorly suited for installation in a sanitary fitting. In addition, it is relatively complicated.

The object of the present invention is to design a pipe interrupter of the type mentioned at the outset in such a way that it can be implemented in a small space with little effort and is also particularly suitable for installation in a sanitary fitting.

d)

das elastische Schließglied als Rollmembran ausgebildet ist, die

da)

im Umfangsbereich festgehalten ist;

db)

im mittleren Bereich ohne Unterdruck im Zulaufkanal an der Mündung des Belüftungswegs in die Kammer elastisch anliegt;

dc)

sich beim Auftreten eines Unterdrucks im Zulaufkanal umstülpt und dann an der Mündung des Zulaufkanals in die Kammer anliegt;

dd)

im Randbereich außerhalb des mittleren Bereiches eine Durchströmungsöffnung aufweist, durch welche Luft im Falle dc) vom Belüftungsweg zum Ablaufkanal strömen kann.

This object is achieved in that

d)

the elastic closing member is designed as a rolling membrane, the

there)

is held in the peripheral area;

db)

rests elastically in the middle area without negative pressure in the inlet channel at the mouth of the ventilation path into the chamber;

dc)

turns inside out when a negative pressure occurs in the inlet channel and then at the mouth of the inlet channel rests in the chamber;

dd)

has a through-flow opening in the edge region outside the central region, through which air can flow in the case dc) from the ventilation path to the outlet duct.

A pipe interrupter according to the invention can easily be installed in the floor area of a sanitary fitting due to its small dimensions. The responsiveness of the roll membrane is great, since only relatively small forces are required to turn it over and elastic expansion does not need to take place.

Figur 1:

die Seitenansicht einer Sanitärarmatur mit eingebautem Rohrunterbrecher, teilweise im Schnitt;

Figur 2:

einen Schnitt durch den Rohrunterbrecher von Figur 1 in vergrößertem Maßstab.

An embodiment of the invention is explained below with reference to the drawing; show it

Figure 1:

the side view of a sanitary fitting with built-in pipe interrupter, partly in section;

Figure 2:

a section through the pipe interrupter of Figure 1 on an enlarged scale.

The sanitary fitting shown in Figure 1 comprises in a known manner a fitting body 1, a rotatable and pivotable operating lever 2 and an extendable outlet mouthpiece 3. The latter is via a shower hose 3 placed in a loop, which is partly inside the fitting body 1 and partly through the Hole of the wash basin to be thought below the sanitary fitting is connected to an outlet pipe 5. The outlet pipe 5 is fastened in a base part 6, which rests on an inner step of the valve body 1. The bottom part 6 carries a control cartridge 7, which can be constructed in a known manner and in which the control elements required for controlling the water flow or the water flows are combined. These controls are moved in a suitable manner by means of the handle 2. Two inlet pipes 8 for cold or hot water also extend through the hole in the washbasin and into the fitting body 1 from below. They penetrate the base part 6 and communicate in a known manner with the control cartridge 7.

The mixed water released by the control cartridge 7, depending on the relative position of the control elements, passes via a channel 9 into a pipe interrupter, which is designed as an insert 13 and is pushed into the base part 6 from the side. It is held there by a screw part 21. A bore 15 is guided through the valve body 1 concentrically to the ring part 21; which part of a ventilation path for the pipe interrupter 13, as will become clear later.

Another channel 11 leads from the pipe interrupter 13 to the outlet pipe 5.

The pipe interrupter 13, which is shown installed in the fitting in FIG. 1, is drawn out in FIG. 2 on an enlarged scale and in section.

A chamber 10 is formed in a housing 22 of the pipe interrupter 13. A channel 14a, which is part of the ventilation path and communicates with the bore 15 in the valve body 1, opens into this, from the left in the drawing. Coaxially to this, a channel 9a opens into the chamber 10 on the opposite side, which is connected to the channel 9 in the base part 6 and is part of the water path between the control cartridge 7 and the outlet pipe 5. Finally, another channel 11a opens parallel to the channel 9a, somewhat below it, which is connected to the outlet channel 11 in the base part 6 and thus to the outlet pipe 5. The chamber 10 is in by a rolling membrane 16, which is fixed at its periphery in the housing 22 divided into two chambers 10a and 10b. Normally, as long as there is no negative pressure in the channel 9a, the rolling membrane 16 lies against the mouth of the channel 14a into the chamber 10 in its central region and thus closes the ventilation path. The opening of the channel 9a into the chamber 10, however, is open, so that the water flow from the control cartridge 7 to the outlet mouthpiece 3 is free.

If a negative pressure now occurs in the inlet channel 9a, the rolling membrane 16 turns upside down in such a way that - as indicated by dash-dotted lines in FIG. 2 - it lifts off the mouth opening of the channel 14a and bears against the mouth opening of the channel 9a. This clears the air path from the channel 14a into the left half of the chamber 10a in FIG. From there, the air can flow through a flow opening 20 in the edge region of the rolling membrane 16 into the right half 10b of the chamber 10 in FIG. 2 and from there into the channel 11a and the downstream flow paths.

The rolling membrane 16 at the mouth of the channel 9a at the same time blocks the backflow of water from the downstream water path, so that contamination of the drinking water by sucked-in, dirty process water is impossible.

Claims (1)

1. Pipe interruptor (13) for sanitary installations, in particular for installation in a sanitary fitting (1), with

a)   a housing;

b)   a chamber (10) in the housing (22), into which open:

ba)   an inlet passage (9a) for water;

bb)   an outlet passage (11a) for water;

bc)   a ventilation path (14a);

c)   a resilient closing member (16) in the chamber (10), which closes the latter and opens the ventilation path in the case of reduced pressure in the inlet passage (9a), characterised in that

d)   the resilient closing member is constructed as a rolling membrane (16), which,

da)   is secured in the peripheral region;

db)   in the central region, without reduced pressure in the inlet passage (9a) bears resiliently against the opening of the ventilation path (14a) into the chamber (10);

dc)   is inverted when a reduced pressure occurs in the inlet passage (9a) and then bears against the opening of the inlet passage (9a) into the chamber (10);

de)   in the edge region outside the central region comprises a flow aperture (20), through which air may flow in the case dc) from the ventilation path (14a) to the outlet passage (11a).

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