DE8524447U1 - Pneumatic control device for a shut-off valve in a vacuum sewer line - Google Patents

Description

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Pneumatic control device for a shut-off valve in a vacuum sewer line

The invention relates to a pneumatic control device for a shut-off valve of a vacuum sewer line, which is controlled by a control valve at a certain maximum water level to open in a waste water collection container and to close again after a certain period of time, which is determined by the duration of the restricted ventilation of a cavity under negative pressure.

Such a pneumatic control device is in the DE-PS 24 62 295 described. It has a relatively complex structure, since it is mutually numerous in addition to being numerous Dependency switchable valves also includes a special switching servo, which opens after the trigger of the diaphragm shut-off valve is first connected to the vacuum source, thereby executes a certain stroke, triggers a sequence control, is then ventilated via a throttle opening and on At the end of the return stroke caused by valve control, the diaphragm shut-off valve can be closed again.

The invention is based on the object of providing a much simpler control than the known design.

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To create device, and to solve this problem wiwill suggested that the ventilated cavity through throttled the upper part of the waste water collecting tank, which is tightly separated by means of a loaded piston, or one connected to it Riser pipe "e is formed, the piston can be raised as the water level rises and at the same time that by the piston displaced air volume can be derived from the cavity and the control valve through which the Knlb? n UHiSCheltber is;

The main advantage of the invention is that a special switching servo with associated connections as a separate one Component is omitted. According to the invention, the upper part of the waste water collecting container serves as the switching servo itself or a riser pipe connected to it. It also did not throw a controllable vacuum connection to the drive this shift servo. In the invention, the movement of the water level in the collecting tank or riser pipe is used for this exploited. The rising water level can e.g. via a float or between the waste water and the piston trapped air volume take the piston upwards, with the air displaced by the piston preferably via a Non-return valve or a non-return valve can escape from the ventilatable cavity.

The downward countermovement of the piston also does not need to be triggered by a special control process. If the water level in the collecting tank drops after the membrane shut-off valve has been opened, it will also automatically lower the piston raised by the water level again. However, this is only to the extent and with speed possible, as air penetrates through a throttle opening into the otherwise closed cavity above the piston. By A suitable choice of the cross section of the throttle opening can thus set the duration of the lowering movement of the piston will.

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In a preferred embodiment of the invention, the non-return valve, through which the air escapes from the cavity via the piston, and the throttle opening through which then again air penetrates into the cavity, combined in a single shut-off device.

In a further preferred embodiment of the invention, the piston is loaded by weight and / or a spring Diaphragm piston, which preferably consists of a rigid central part guided in a vertical direction and one with this tightly connected, cuff-shaped membrane, which on the outer periphery tightly against the wall of the collecting container or riser pipe is connected.

In contrast to the movements of the can be raised and lowered according to the changes in the water level in the collecting tank Piston, the switching movements of one or more valves controlled by this piston are relatively small. In order to the switching of which only takes place in the end phases of the piston movements is a further preferred embodiment According to the invention, the piston is connected to the valves controlled by it via a control rod is, this connection being provided with a certain amount of play in the direction of movement. In the simplest In the case, only a single control valve is switched back and forth by the piston, which is in its one switching position the diaphragm shut-off valve connects to the vacuum source and thereby opens, and in its other switching position the Actuating device of the diaphragm shut-off valve ventilates so that it closes again. The membrane shut-off valve can e.g. have the shape shown in DE-PS 1 609 245 or DE-OS 26 52 878. The overall arrangement and interconnection between the diaphragm shut-off valve and the control device described here results, for example, from the above DE-PS 24 62 295.

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With regard to the perfect functioning of the entire company

! |! . pressure drainage system and the relevant house connection

! ' It is recommended that the diaphragm shut-off valve only then

■ to let it open when a sufficiently strong negative pressure

j sem house connection is available. In another preferred embodiment

> ■ Management of the invention is therefore provided that with the

jij water level in the waste water collecting tank rising "and falling

v; de piston over a Steuerstanae with Beweaunqsspiel with a

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'; * Vors +' - euerventil is connected, which when the piston is raised ^ a vacuum source with the control valve of the diaphragm Abj | Blocking valve and with a pneumatic adjusting device jp for switching this control valve connects, the % adjusting device being biased with a certain force counteracting the opening movement ί'ί of the control valve.

Alternatively, the negative pressure could also be constantly applied to the control valve of the diaphragm shut-off valve. When switching the Pilot valve through the piston raised by the water level is then only the pneumatic control device of the control valve is subjected to negative pressure. Only if this is sufficiently strong can it prevent the opening movement of the Control valve counteracting force, e.g. exerted by a snapper, overcome it and thereby opening it of the diaphragm shut-off valve.

To re-open the diaphragm shut-off valve after an opening process to close, both the control valve and the pilot valve must be returned to their original position will. For this purpose, the control rod is preferably connected to the valve body of the control valve with play, that its opening movement by the pneumatic actuator, but the closing movement by the control rod he follows.

The valve body of the pilot valve is admittedly through the Control rod moved in the opening direction, but more preferred

Execution brought back into the closed position by a weight, guided and held in this position. f

The invention is explained in more detail below with reference to an exemplary embodiment shown in the drawing.

10 with a riser is referred to, which is from a

not shown collecting tank for waste water upwards

stretches. As a collecting container, this can be done by a membrane-off |

Check valve normally closed lower end of the slope I

to manage a house. If more and more i

Accumulates waste water, rises in the above-connected riser "·

pipe 10 the water level and assumes a dashed line

swimmer 12 pointed upwards. The swimmer is 12! *

connected to a diaphragm piston 14. The latter separates the ' uppermost part of the riser pipe 10 as a substantially closed cavity 16 from the lower part of the riser pipe 10. In the example, the diaphragm piston consists of a disk-shaped, rigid central part 18 and one that is tightly connected to it as well as the jacket wall of the riser pipe 10 connected cuff-shaped, flexible membrane 20. For reasons of manufacturing technology, the upper, end face essentially closed End 22 of the riser pipe 10 be a special item, the membrane 20 on the outer circumference between the Main part of the riser pipe 10 and its upper end part 22 can be clamped tightly and tightly. One for that purpose Clamping bracket engaging parts 10 and 12 is shown at 24.

So that the diaphragm piston 14 is as straight as possible in a vertical position Moving direction, its stiff middle part 18 is on the top with a rod 26 ■ · - ·· »inden, which is in a Upper end closed, extending in the vertical direction sleeve 28 is guided. The sleeve 28 is with the Connect the end wall of the riser pipe "upper part 22".

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Also on the top end wall of the riser is one Check valve 30 arranged. It is designed so that when the diaphragm piston 14 with rising water level in the riser pipe 10 by the float 12 or the trapped air volume between the water level and the membrane piston 14 is raised, the volume of air displaced by the membrane piston 14 can escape unhindered from the cavity 16 ·. So it arises with an upward movement of the membrane volute bens 14 in the cavity 16 no overpressure.

The check valve 30 is provided with a small hole that represents a throttle opening. If after vacuuming the Waste water from the collecting tank and the riser pipe 10 connected to it, the diaphragm piston 14 by the weight is pushed down again, it descends to the extent and with the same speed as it is caused by the small hole in the non-return valve 30 in the cavity 16 allows air flow. By appropriately choosing the size of the Hole in the check valve 30 can reduce the opening time of the shut-off valve between the vacuum drainage line and the collecting container can be determined. In this way it can be determined whether the control device shown actuated shut-off valve opens until not only the waste water volume accumulated in the collecting tank, but then a certain volume of air is sucked into the negative pressure sewer pipe. The setting the throttle opening in the check valve 30 can also be made so that the shut-off valve substantially closes again immediately after the drained waste water has passed through. The small amount of air flowing in is only needed sufficient to allow the sewage to get into the house connection pipe, which is laid with a slight gradient and which enters the main line extending along the street opens. Alternatively, you can also use a smaller hole in the Check valve 30 a much longer opening time of the shut-off valve can be set, so that with each suction

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Process after the wastewater an amount of air amounting to several times its volume into the negative pressure wastewater pipe is sucked in.

To operate the to open and close the shut-off valve required control valves is up through the end wall of the riser pipe 10 from this a control rod 32 led out. As shown, the lower end of the control rod 32 is longitudinally slidable in one with the rigid central one Part 18 of the diaphragm piston 14 fixedly connected vertical guide 34 was added. Only at the bottom of the guide 34, the control rod 32 is entrained by the diaphragm piston 14 upwards, and only at the upper end of the guide 34, the control rod 32 is carried along by the diaphragm piston 14 downward. In between there is a free one vertical movement play between the diaphragm piston 14 and the control rod 32 - i.e., starting from the position shown, the diaphragm piston 14 must first lift the length of the guide 34 before the control rod 32 goes up is taken and moved. In the uppermost position of the control rod 32, a seal 36 seated on it seals the through opening in the upper end wall of the riser pipe 10 for the control rod 32. Accordingly, when the Water level and lowering membrane piston 14 air only through the throttle opening in the non-return valve 30 in the Penetrate cavity 16.

The timer device consisting of parts 10, 14, 16, 26, 30 controls in the example a total of a pilot valve 38, a control valve 40 and a pneumatic one Adjusting device 42 for the control valve 40 existing valve arrangement. The input of the pilot valve marked with A. 38 is constantly connected to the negative pressure sewer pipe in the direction of flow behind the shut-off valve, is therefore constantly under negative pressure. If the diaphragm piston 14 with rising water level by more than that

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Movement clearance along the guide 34 lifts the control rod 32 upwards and opens the pilot valve 38, which is preloaded by a weight 44 which is connected on the one hand to the valve inlet C of the control valve 40 and on the other hand at E to the pneumatic adjusting device 42. The control rod 32 j, in the example, is held in its upper position by a mechanical catch 48, which can, for example, have the shape of a spring-loaded ball pressing against a cam on the Stc.ierf rod 32, in which the pilot control - ψ valve 38 is open.

} A similar snapper 50 acts on the piston rod of the pneumatic actuating device 42 connected to the valve body ν by the control valve 40 and represents a certain resistance which the pneumatic actuating device 42 must overcome before the control valve 40 is opened.

i; In detail, the pneumatic actuating device 42 consists in the

Example of an elastic piston 52, e.g. made of rubber, which slidably but tightly rests against the cylinder wall of the actuating device 42. With sufficient flexibility of the Piston 52 could also be firmly connected to the cylinder wall on the outer circumference. The piston 52 has a larger one Effective piston area as the face of the valve body (slide) exposed to the negative pressure at valve inlet C of the control valve 40. Since both surfaces have the same negative pressure are exposed to the control line 46, the piston 52 of the pneumatic actuator 42 pulls the control valve 40 in . the opening position upwards as soon as the pilot valve ι has been opened by the control rod 32 i & t, if the Un-I tefpressure at port A is sufficient to ;: 50 to overcome the resistance to displacement exerted on the piston rod of the piston 52. So that the Schpapper 50 die

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Piston rod of the aesthetically pleasing piston 52 not on the side pushes away, are with the piston rod above and below of the designated 54 cam of the catch 50 in the cylinder the actuating device 42 guided Puhrungsplatten 56, 58 connected.

As soon as the pneumatic actuating device 42, the valve body of the control valve 40 has been pulled up into the open position, the negative pressure reaches the valve inlet C to Valve output D and from there via a control line 60 in a known manner to the shut-off valve, which opens as a result is, so that the waste water collected in the collecting tank and riser pipe 10 through the open shut-off valve into the negative pressure sewer line is sucked.

If after the drop in the water level in the riser pipe 10 the Diaphragm piston 14 due to its own weight, the additional weight 26 and possibly a spring load depending on The size of the throttle opening in the non-return valve 30 decreases more or less quickly, the control rod 32 is through the frictional engagement of the catch 48 initially still held in its upper position, so that that too Vorsteuerveni.il 38 and the control valve 40 remain open until the wastewater and possibly a certain Amount of air has been sucked into the negative pressure sewer line via the shut-off valve. After the expiry of the election the size of the throttle opening in the check valve 30 and the weight 26 predetermined period of time for the lowering of the Diaphragm piston 14 comes the upper end of the guide 34 at the bottom End of the control rod 32 to the plant and pulls it with overcoming the resistance of the catch 48 below. As a result, the valve body of the pilot valve 38 is returned to the closed position. This can be a fixed The valve body of the pilot valve 38 is connected to the control rod 32. However, as shown, it is preferred an axially displaceable connection between the

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Valve body of pilot valve 38 and control rod 32 » such that the valve body is in the opening direction of the Control rod 32 is taken upwards, the holder on the control rod for the valve body, e.g. on the weight 44 or an axial collar engages the valve body, the return of the valve body to its closed position however, takes place solely through the weight load 44 and the control rod 32 may then also lower itself further can when the valve body has already reached its closed position, with the bracket guiding it on the control rod 32 slides axially along the valve body.

The pneumatic adjusting device 42 is in the Ausf ülirungsbeispiel provided only with a single vacuum connection E and in this preferred simple embodiment not in the length of time to positively switch the control valve 40 back into the closed position. This switching movement is in the example executed directly by the control rod 32, in which this via a on the piston rod of the piston 52 and the The lever 62 engaging the valve body of the control valve 40 pulls these parts downwards after the pilot valve 38 has been closed. The lever 62 is connected to the control rod 32 via a guide 64 with axial movement play, which ensures that when the control rod 32 is raised, the valve body of the control valve 40 is not carried over the lever 62 takes place and the closing movement of the control valve 40 compared to the closing movement of the pilot valve 38 is somewhat delayed.

Also between the lever 62 and the piston rod of the piston 52 which is connected to the valve body of the control valve 40 an axially displaceable, limited by a stop connection can be provided and a weight load 66, the after overcoming the displacement resistance by the snapper 50 when pulling down the valve body of the control valve

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returns the valve body to the fully closed position through the control rod 32 and the lever 62.

The leakage is arranged at 68 on the pilot valve 38 and in a corresponding manner, a leak is also provided at the control valve 40 at 70. These leaks 68 and 70 can be e.g. be designed that a conical pin or shaft of the valve body has a cooperating with it bore when it is open Valve 38 or 40 tightly closes, but when valve 38 or 40 is closed, there is an annular gap between the

Niche pin or shaft and the bore is open, through which air flows into the outlet side of the valve 38 and 40, respectively can. After the pilot valve 38 has been closed, the flow flowing into the control line 46 through the leakage 68

Air removes the residual vacuum in the pneumatic actuator 42 so that the control rod 32 can return the control valve 40 to the closed position. The after Closing the control valve 40 through the leakage 70 in the control line 60 flowing air removes the residual vacuum in the shut-off valve, not shown, of the negative pressure sewer line, so that the shut-off valve closes again and the Disconnects the vacuum sewer line from the house's sewage collection tank.

In the embodiment shown, the valves 38 and 40 and the pneumatic actuating device 42 are one above the other arranged. This does not necessarily have to be the case. Of course, the control rod 32 can also be angled in this way and / or be provided with side arms that the valves 38 and 40 side by side or in any other spatial assignment can be arranged.

It is further understood that the invention is neither limited to the illustrated shape of the piston 14, nor to the specific embodiment the non-return valve 30 with throttle opening, finally to the training and arrangement shown only by way of example

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of the pilot valve 38 and the control valve 40 with the pneumatic actuator 42 is limited. Numerous variants are available to those skilled in the art for all of these components of the invention. Essential for the inventor "
Training is the interaction of the components in the combinations resulting from the claims.

Claims (6)

• a ■ · * ff · ta «- 13 - CLAIMS 1. Pneumatic control device for a shut-off valve of a Negative pressure sewer line, which by a control valve at a certain maximum water level in a Sewage collection container to open and after a certain Time to close again, which is due to the duration of the throttled ventilation of a vacuum standing cavity is determined thereby characterized in that the ventilated cavity (16) which is throttled by means of a loaded Piston (14) tightly separated upper part of the waste water lambing container or one connected to it Riser pipe (10; is formed, the piston (14) can be raised as the water level rises and at the same time through the Piston (14) displaced air volume from the cavity (16) can be derived, and the control valve (38, 40) through the Piston (14) is switchable. 2. Control device according to claim 1, characterized labeled that the piston (14) is a diaphragm piston loaded by weight (26) and / or a spring is. 3. Control device according to claim 2, characterized in that the diaphragm piston (14) from a stiff middle part (18) guided in the vertical direction and a cuff-shaped part that is tightly connected to it Membrane (20) consists, which on the outer periphery tightly against the wall of the collecting container or riser pipe (10) is connected .llimrff-— ■ - ¹ ' - - 14 - 4. Control device according to one of claims 1 to 3, characterized in that the Piston (14) is connected to the control valve (38, 40) via a control rod (32), this connection is provided with a certain play (at 34, 64) in the direction of movement. 5. Control device according to one of claims 1 to 3, characterized in that the Piston (14) via a control rod (32) with Beweyang play (at 34) is connected to a pilot valve (38) which, when the piston (14) is raised, is a vacuum source (A) with the control valve ί 40) and one pneumatic Adjusting device (42) connects to its switching, the adjusting device (42) with a specific, the opening movement of the control valve (40) counteracting force (at 50) is biased. 6. Control device according to claim 5, characterized in that the control rod (32) is connected to the valve body of the control valve (40) with play (at 64) such that its opening movement by the pneumatic adjusting device (42), but the closing movement by the control rod (32). 7 «Control device according to one of the preceding claims, characterized in that the Cavity (16) with the outside atmosphere via a non-return valve which blocks in the direction of flow from the outside to the inside (30) is in communication with a throttle opening.