EP0926301A2 - Non-return valve - Google Patents

Abstract

The back flow preventer has a back flow detector with a drive lock adjuster (50) actuated by the detector. A drive closure (40) is placed in a first position when the back flow is present and is movable into a second discharge position for the back flow, in which the drain is closed. The emergency closure (70) is movable by the adjuster to a third operational position, in which a discharge of the drain water is possible, if no back flow is present, and is moved by self adjustment into a closed position by the discharge.

Description

The invention relates to a backflow stop device according to the preamble of claim 1.

A backflow stop device for one Sewage line for sewage containing faeces is out of the EP 0 307 698 A1 is known. This well-known Backflow stop device has two from each other independent locks on, an operating lock and an emergency lock. The operating lock is with a Rotary drive connected. A control device that Receiving signals from a liquid sensor is for Control of the rotary drive is provided. If not Back pressure is present and the liquid sensor is none Emits signals to the control device, the Rotary drive the operating lock in a forced open position in which the wastewater can drain. At The liquid sensor indicates a backflow Signals to the control device, which then the Actuates the rotary drive in such a way that the operating lock from the open position to a closed position, in which the sewage pipe is closed is moved.

The emergency stopper of the known backflow stop device is in a forced connection with one Manual control lever. In a first position of the The manual override will force the emergency lock kept in an open position. In a second The position of the manual operating lever becomes the emergency lock locked in a closed position.

The first position of the manual control lever, in which the Emergency lock is forcibly opened, corresponds to the normal working position. The second position of the Manual operating lever in which the emergency lock in the Locked position is locked, regardless of the position of the operating closure no drainage of the Sewage and is only chosen if for example in the event of a long absence, a closure the sewage pipe is to be ensured.

With normal, i.e. forced open position of the The operational lock alone takes over the emergency lock securing against backflow by backflow. However, the closing time of the company lock can be after of DIN 19578, Part 1 for backflow valves for waste water containing faeces can be up to 60 seconds. In the event of a sudden backflow, a significant wastewater reflux occurs before the Operating lock has reached its closed position. Of the until the operating lock closes completely in the event of a sudden backflow occurring backflow can cause massive water ingress into the Cellars and corresponding damage.

The invention is based on the technical problem Backflow stop device for a sewer pipe Generic type in such a way that also at back pressure suddenly occurring to protect against Backflow is guaranteed.

The solution to this technical problem is in characterizing part of claim 1 specified. Advantageous developments of the invention are in the Subclaims described.

According to the emergency closure is designed so that it can be brought into a third operating position, in which it allows drainage of the waste water if there is no back pressure, and if one occurs Backlogs automatically reach a closed position.

During the emergency closure in the first and second Operating position like that known from EP 0 307 698 A1 Emergency lock in a forced connection with the Emergency lock actuator is, he is in the third operating position from the Emergency lock actuator decoupled. Alone depending on whether there is a backwater or not, takes the emergency lock in this third operating position either a closed position or a position in a drainage of the waste water is possible.

If there is a sudden back pressure, the backflow caused by the backflow immediately Closing the emergency lock. This will ensured that within the period of time to Closing the service lock is necessary, no Reflux occurs, for example, to a Flooding the basements of a house can result. Even in cases where, for example, by Contamination by the automatic closing of the Emergency seal is not completely sealed, becomes the cross-section which enables a backflow compared to that known from the prior art Backflow stop device so severely restricted that within the time to complete closure no significant reflux of the operational closure he follows.

In an advantageous embodiment of the invention the emergency seal has a backflow due to a Backlogs automatically closing emergency shutters, which in the first operating position by the Emergency lock actuator in one position is held in the cross section of the sewer wholly or at least largely kept free is in the second operating position of the Emergency lock actuator in one position is kept in which the sewage pipe is closed is free and in the third operating position is pivotable. If sewage inside a building occurs, the emergency flap is due to the water flow open. If the backflow occurs quickly, the Emergency flap through the backflow into the Closed position pressed.

Fig. 1 einen Längsschnitt durch ein Ausführungsbeispiel einer Rückstauverschlußvorrichtung zeigt, bei der der Betriebsverschluß voll geöffnet und der Notverschluß in der ersten Betriebsstellung ist, in der der Notverschluß zwangsweise in voll geöffneter Stellung gehalten wird,

Fig. 2 einen Längsschnitt durch das Ausführungsbeispiel gemäß Fig. 1 zeigt, bei dem der Notverschluß in der zweiten Betriebsstellung ist, in der der Notverschluß zwangsweise in seiner geschlossenen Stellung gehalten wird,

Fig. 3 einen Längsschnitt durch das Ausführungsbeispiel gemäß Fig. 1 zeigt, bei dem der Notverschluß in der dritten Betriebsstellung ist, in der der Notverschluß frei beweglich ist,

Fig. 4 eine teilweise geschnittene perspektivische Detailansicht einer ersten Ausführungsform des Notverschlusses in der zwangsweise geschlossenen Stellung zeigt,

Fig. 5 eine teilweise geschnittene perspektivische Detailansicht des Notverschlusses gemäß Fig. 4 in der zwangsweise geöffneten Stellung zeigt,

Fig. 6 eine teilweise geschnittene perspektivische Detailansicht einer zweiten Ausführungsform des Notverschlusses in der zwangsweise geschlossenen Stellung zeigt und

Fig. 7 eine teilweise geschnittene perspektivische Darstellung des Notverschlusses gemäß Fig. 6 in der zwangsweise geöffneten Stellung zeigt.

The invention is explained below with reference to preferred embodiments with reference to the drawing in which

1 shows a longitudinal section through an embodiment of a backflow stop device, in which the operating lock is fully open and the emergency lock is in the first operating position, in which the emergency lock is forcibly held in the fully open position,

FIG. 2 shows a longitudinal section through the exemplary embodiment according to FIG. 1, in which the emergency lock is in the second operating position, in which the emergency lock is forcibly held in its closed position,

3 shows a longitudinal section through the exemplary embodiment according to FIG. 1, in which the emergency lock is in the third operating position, in which the emergency lock is freely movable,

4 shows a partially sectioned perspective detail view of a first embodiment of the emergency closure in the positively closed position,

5 shows a partially sectioned perspective detail view of the emergency closure according to FIG. 4 in the positively opened position,

6 shows a partially sectioned perspective detail view of a second embodiment of the emergency closure in the positively closed position and

FIG. 7 shows a partially sectioned perspective view of the emergency closure according to FIG. 6 in the positively opened position.

Fig. 1 shows an embodiment of the Backflow valve device according to the invention. A Cleaning pipe 1 has an opening 2 for the connection an inlet pipe, an opening 3 for connecting a Drain pipe and a cover 4. Such Cleaning pipes are for example in the Pipeline, e.g. used in the basement. At the opening 2 of the cleaning tube 1 closes in In this case, an inflow through which the waste water enters Cleaning pipe enters and exits through opening 3, to which a drain pipe is connected.

Between the pipe socket with the inlet opening 2 and the Pipe socket with the drain opening 3 shows that Cleaning pipe 1 a substantially U-shaped Base body 5, in which an operating lock 40 and an emergency seal 70 are used. After removing the Cover 4 and removal of the operating lock 40 and the emergency lock 70 delimits the base body 5 an open-top cleaning shaft that gives access of the pipe system for cleaning work.

The operating lock has an operating lock flap 41, which has an operating lock actuator 50 can be pivoted. The Operating lock actuator 50 has one Servomotor on, which is a function of signals Backflow detection device the service shutter 41 stops in a first operating position, in the Drainage of waste water is possible if based on the signals the backflow detection device is recognized that no Back pressure is present. This position of Operating closure flap 41 is shown in FIGS. 1 to 3 shown.

If there is backflow from the drain side, the backflow detection device recognizes this Malfunction and gives appropriate signals to the Operating lock actuator 50 from. As In response, the operation shutter actuator moves 50 via the servomotor Operation shutter 41 in the second Operating position in which the operating closure flap 41 fits tightly against a sealing seat 42 and thereby the Waste water pipe closed.

When the backwater cleared and one through the backwater caused reflux has flowed back, the End of the malfunction from the Backflow detection device recognized, thereupon appropriate signals to the operating lock actuator 50 issues. The servomotor moves then the operating shutter 41 from the second, closed operating position back to the first, open operating position.

The emergency closure 70 has an emergency closure flap 71, by a pivot shaft 72 in a pivot bearing 73 is stored. On the emergency flap 71 is a Guide web 74 integrally formed with a guide track 75.

The emergency lock is operated using a Actuator 80, which with a manual control lever 90 in Connection is established. Both the manual control lever 90 and the actuating element 80 are also above a predetermined one Angular range pivotable about an axis of rotation 91, wherein the actuating element 80 via a square recess 81 positively connected to the manual control lever 90 is and a predetermined angular position to the Hand control lever 90 takes.

Figures 4 and 5 show a first embodiment of the Actuating element 80 and the associated guideway 75. This actuating element 80 has two side walls 82a, 82b on. In Figures 4 and 5 is that in the perspective view facing the viewer Side wall 82b shown partially cut to the View of a locking pin 83 to release the one has an approximately semicircular cross section. Of the Locking pin 83 is on both side walls 82a, 82b molded and connects them together.

In a precisely defined spatial assignment to the Locking pins 83 are on each side wall 82a, 82b each formed a locking pin 84a, 84b. The Locking pins 84a, 84b have a round cross section and a common central axis. The distance of the Locking pin 84a, 84b to each other is dimensioned so that the Guide bar can pass through the locking pin, i.e. the thickness of the guide web 74 is less than that Distance of the end faces of the locking pins 84a, 84b.

The guideway 75 has two opposing curvatures on a first section 75a, a second Section 75b and a third section 75c from each other delimit. This results in an approximately S-shaped Course of the continuous top 76 and the two opposite and through the guide web 74 separate undersides 77a, 77b of the Track 75.

When the manual operating lever 90 is different from that shown in FIG. 3 shown position is turned clockwise, the locking pins 84a, 84b arrive in the area of the first Section 75a of the guideway 75 with its undersides 77a, 77b engaged. This will close the shutter 71 pivoted into an open position. One by rotation of the manual control lever 90 can be reached clockwise first end position is shown in Fig. 1. In this first one End position of the manual operating lever 90 takes the Emergency lock 70 a first operating position in which the emergency flap 71 is forcibly kept open and this results in a specific cross-section of the sewage pipe is kept free.

If the manual operating lever 90, starting from the in Fig. 3 position shown, counterclockwise pivoted to the left, the locking pin 83 arrives in the third Section 75c of the guideway 75 with its upper side 76 engaged. As a result, the emergency flap 71 in brought a closed position in which they are in the system a sealing seat 78 comes. In the by swiveling the Hand control lever 90 counterclockwise achievable second end position, shown in Fig. 2 is, the emergency shutter 71 over the Locking pin 83 and the top 76 of the guideway 75 in its third section 75c firmly against the sealing seat 78 pressed. This position of the emergency flap provides represents a second operating position of the emergency closure 70, in which the sewage pipe is closed.

If the manual operating lever 90 is between the first and the second end position lying middle position occupies, which is shown in Fig. 3, is Emergency flap 70 between one with a solid Lines shown closed position and one in Dashed lines shown open position freely movable and can move in between these positions Swing back and forth in the direction of arrow A. In this The middle position of the manual control lever 90 can Guide bar in the swivel area between the two End positions freely between the side walls 82a, 82b of the Actuating element 80 pass through without the Locking pin 83 with the top 76 of the guideway 75 and the locking pins 84a, 84b with the undersides 77a, 77b the guideway 75 come into contact. Of the Emergency lock 70 thereby takes a third Operating position in which he has a drain of the Waste water allows if this from the inlet pipe flows through the opening 2, and when a Backlogs automatically reach the closed position, if due to the back pressure through the opening 3 from the Drain pipe a reflux occurs.

The manual operating lever 90 is one end Connected spring element 92, at the other end one Latch 93 is formed. When swiveling the Manual operating lever 90 runs the latch 93 over the Surface of a molded part 94 which is shaped such that the manual operating lever 90 in the first and second End position and in the intermediate position Middle position is fixable. This will ensured that the manual operating lever 90 and so the actuator 80 in the desired position remain and the emergency seal actually the occupies the desired operating position.

Fixing the manual control lever 90 in the two End positions or the middle position is thereby causes the spring element 92 and the molded part 94 so trained and assigned to each other that a Displacement of the manual control lever 90 from a of these three positions a deformation of the spring element 92 requires. The one for the deformation of the spring element 92 The force required is such that, on the one hand, the Operating forces of the manual operating lever 90 are not too high lie and on the other hand a reliable fixation in the two end positions and the middle position is guaranteed.

To prevent the inadvertent swiveling of the Manual operating lever 90 beyond the middle position in the first end position, in which the emergency lock occupies the first operating position in which a certain The cross section of the sewage pipe must be kept clear prevent, there is a protrusion on the molded part 94 95 trained. In the middle position of the Manual operating lever 90 is the latch 93 on the Projection 95 on. A swiveling of the Manual operating lever 90 is only in the first end position then possible if the spring element 92 is raised so far is that the locking lug 93 over the projection 95th can move away. Snaps in the first end position the latch 93 locking on the opposite Protrusion 95 side.

In Figures 6 and 7 is a modified Embodiment of an emergency seal 170 shown. The embodiment of the emergency closure 70 according to FIGS Figures 4 and 5 corresponding components are with the provided with the same reference numerals, only by the number 100 increased.

As taken from the illustration in Figures 6 and 7 can be, the emergency lock 170 corresponds to the Figures 6 and 7 essentially according to the emergency closure 70 Figures 4 and 5. There is a first difference in that the pivot bearing 173 for receiving the Swivel shaft 172 a greater distance from each other have as the pivot bearing 73 of the above described first embodiment of the emergency seal 70. This ensures a particularly stable storage of the Emergency flap 171 reached.

Another difference is that the Locking pins 184a, 184b on the outer sides of the side walls 182a, 182b of the actuating element 180 are integrally formed. This results in greater freedom of design in the construction of the guideway 175, whose Top 176 in the third section 175c Interact with the locking pin 183, which in this Embodiment has a circular cross section, closing the emergency flap in the second Must ensure the operational position of the emergency lock, their passage through the two side walls 182a and 182b due to the external locking pins 184a, 184b is relieved, however.

The locking pins 184a, 184b engage in the first Operating position of the emergency lock 171 in corresponding trained guide pieces 188a, 188b, to both Sides of the guide bar 174 on the flap 171 are molded.

With regard to their function, especially in Cooperation with the manual operating lever 90 according to the Figures 1 and 3, the emergency lock 170 corresponds to 6 and 7 the emergency closure 70 according to the figures 4 and 5.

Claims (10)

Backflow stop device for a sewage pipe, in particular for sewage containing faeces, with a backflow detection device, with an operating closure actuating device (50) operating as a function of signals from the backflow detection device, with an operating lock (40) which is in a first operating position which enables the waste water to drain off when there is no back pressure and which can be brought into a second operating position by means of the operating lock actuating device when the back pressure occurs, in which the waste water line is closed, with an emergency lock actuator and with an emergency closure (70, 170) which is independent of the operating closure (40), which can be brought into a first operating position by means of the emergency closure actuation device, in which a certain cross section of the sewage pipe is kept free, and which can be brought into a second operating position by means of the emergency closure actuation device the sewage pipe is closed,
characterized, that the emergency closure (70, 170) can be brought into a third operating position by means of the emergency closure actuation device, in which it enables the waste water to flow off when there is no backwater, and automatically comes into a closed position when a backflow occurs. Device according to claim 1, characterized in that the emergency lock (70, 170) is an emergency lock flap (71, 171), which is designed so that at a backflow occurring due to backflow automatically closes. Device according to claim 1 or 2, characterized characterized in that the emergency lock actuator has a manual operating lever (90). Device according to claim 3, characterized in that the emergency seal (70, 170) in the first Operating position is when the manual control lever (90) is in a first end position that the Emergency lock (70, 170) in the second operating position is when the manual control lever (90) is in a second end position, and that the emergency closure (70, 170) is in the third operating position when the manual control lever (90) in a between the first and the second end position Middle position. Device according to claim 4, characterized in that the emergency lock actuator has a lock (93, 95) which move the manual operating lever (90) from the middle position to the first end position prevented, and means (92) for overcoming the Lock (93, 95). Device according to one of the preceding claims, characterized in that the Emergency closure actuating device, an adjusting element (80, 180), that in the first and second Operating position of the emergency lock (70, 170) with a guideway connected to the emergency lock (70, 170) (75, 175) is engaged. Apparatus according to claim 6, characterized in that the adjusting element (80, 180) has two side walls (82a, 82b; 182a, 182b) through which the guideway (75, 175) can pass freely if the Emergency lock (70, 170) in the third operating position located. Device according to claim 7, characterized in that the actuator (80, 180) one between the Side walls (82a, 82b; 182a, 182b) extending Has locking pin (83, 183) in the first Operating position of the emergency seal (70, 170) with the Guideway (75, 175) is engaged. Apparatus according to claim 7 or 8, characterized characterized in that the adjusting element (80) two between locking pegs (84a, 82b) arranged on the side walls (82a, 82b) 84b) which, in the second operating position of the Emergency closure (70) with the guideway (75) in Are intervention. Apparatus according to claim 7 or 8, characterized characterized in that the adjusting element (180) two on the Outside of the side walls (182a, 182b) arranged Locking pin (184a, 184b), which in the second Operating position of the emergency lock (170) with two that Closing the emergency seal (170) Guide pieces (188a, 188b) are engaged.

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