DE4412683C2 - Compound water meter - Google Patents

Description

The invention relates to a compound water meter according to the preamble of Claim 1.

Such a compound water meter is known from DE 42 32 774 A1. It sticks out there Center hub with ribs and thus also the inlet funnel of the switch insert carrier large piece in the flange of the main meter to a larger installation length for the Get compression spring. The inlet funnel is as long and flat as possible. The This long and flat version is required to reduce pressure loss, which is severely restricted by the nominal cross-section of the main meter th cross section of the main flow passage occurs. To an undesirable boost to avoid the valve plate of the closure body, the valve plate is during the Valve closing position arranged in a neutral ring chamber. Has this training the disadvantage of a long opening stroke, because during the valve opening stroke the valve disk first emerge from the neutral ring chamber mentioned above and then still has to cross a slot zone of an inlet channel for the bypass flow before he arrives at the entrance to the storage zone. An elastic lip seal leads as We seal off part of the initial stroke. Your uncontrolled tearing can go too Damage to the lip seal.

One also leads to the composite water meter known from DE 30 34 056 A1 Path seal off part of the initial stroke.

The current compound water meters are mainly in short lengths (for each Nominal meter size different) d. H. you can do it without changing the line  at any time instead of a vertical Woltmann meter of type WS in the line install if the flow rates at one installation point have become so different are that the simple WS counter can no longer record them exactly.

For example, the overall length of a WS meter of nominal size is 50 mm norm according to 270 mm. The compound water meter with the same overall length is divided into 200 mm length for the Woltmann meter WP 50 mm as the main meter and a maximum of 70 mm overall length for the changeover valve of nominal size 50 mm.

Known spring changeover valves for compound water meters, especially those in Short overall length according to DE 33 16 205 A1, DE 35 15 565 A1 and the German Pa tentschrift DE 30 35 047 C2, are characterized essentially by the fact that they represent said double seat valves, d. that is, from the opening differential pressure (approximately 0.2 bar) acted upon ring area at the main passage is between an inner and an outer sealing point. This ring area is essential for every nominal valve size smaller than their pipe cross-section, so that the opening force moment (ring area × dif pressure) produces a not too strong compression spring for the closing force, otherwise the maximum pressure loss of 0.5 bar at the maximum prescribed in the calibration regulations flow exceeded by quite a bit due to the strongly increasing spring resistance. To keep the ring area as small as possible, you have the main passage of this Ven Tile even narrowed to a certain extent in the outer diameter.

With these measures, more favorable conditions for the construction of Spring changeover valves, especially created for those in short length, as this was possible until then with conventional single-seat valves.

A disadvantage of the spring valves mentioned is that the ver in the valve closed state relatively far before the narrowed main passage protruding switching element front parts with larger flows for reasons of pressure loss up to behind the narrow main passage and partly also behind the conical stowage channel of the  Switch insert must be returned, which causes the valve lift and thus the spring tension is extended considerably.

The reduction in ring area results in the opening being uniform at around 0.2 bar differential pressure a smaller opening torque (smaller ring area × difference pressure) and thus a weaker compression spring, but this is at the expense of one smaller main passage with more pressure loss with larger flows.

The length of the valve lift and the pressure spring strength are therefore the determining ones Features for the double-seat valves in composite water meters.

The invention is based on the object of a compound water meter Specify the type mentioned above, to a short construction in the longitudinal direction of the changeover valve contributes.

The object is achieved according to the invention by those specified in claim 1 Characteristics.

The fact that in the invention no elongated stowage channel, but only a thin ne baffle ring is used as a baffle element and at the main passage of the order switching valve also no sealed opening path for a measuring error-free switch ganfunction is necessary, results from the valve closing position to the first oven position of the switching element (storage plate just behind the thin baffle plate in hydraulic locking phase) an extremely short first stroke of the switching element.  

This is only slightly larger than the sheet thickness of the Congestion ring disc, because the control edge of the baffle plate in the Valve closing state either just before the traffic jam ring disc is arranged or even something in this one stands. Since also the further opening of the Switching device up to the end stop on the spring tension mother on the practically (physically) shortest possible Distance between the baffle plate and the one there ter in the maximum open position is brought, the result is an extremely cure Zero valve stroke. This is much smaller than the total stroke of known spring changeover valves with Ring channel and slot control or the like. At these valves are always used for functional reasons a sealed initial stroke is required for bridging which in connection with the stroke through the long the accumulation channel up to the end stop stroke of these valves extended even further.

Since the switch insert according to the invention preferably se also no protruding in front of the switching valve Has switching element parts, the short stroke is not through measures for those from the main passage parts to be returned extended.

The possible short stroke of the changeover valve the switching device now gives the big one Advantage that the difference between the valve opening and the section modulus of the Um switching valve at maximum flow and thus at full open position is much lower than at Valves where a long total stroke from radio reasons is inevitable. Because of the stroke length the resistance and therefore also the maximum Pressure loss of 0.5 bar (according to the calibration regulations) as As a result, the upper limit is determined by the Short stroke to a much larger opening mo ment than this with the known valves with large Stroke lengths were previously possible.

This enlargement of the switch valve opening moments (effective area between the sliding pin and the sealing seat x yields about 0.2 bar differential pressure) according to the invention now a main passage that at the smaller nominal valve sizes with the nominal diameter of the switching valves is identical and only little constriction in the valves with the larger ones Nominal sizes required.

Through this main passage enlargement the pressure loss of the composite water according to the invention serters significantly reduced despite the short length.

Advantageously, by increasing the  Main passage a valve type with also only a single valve seat (sealing seat) created and there the narrow bypass and the inner are then eliminated re cavity. All with double seat valves by storage stations and similar possible defects (switching and so with measurement error) are therefore in the invention Changeover valve hardly possible anymore, not even at long shorter installation time in the line.

The invention is practically the smallest possible Valve stroke and thus such a large valve head passage, so that therefore no long inlet funnel necessary is. Because of the advantage of the thin Containment ring disk is reached at the beginning of the Switching strokes also no path seal as a bypass necessary, a simple elastic flat gasket is sufficient or the like as a sealing element on the valve seat. By the short stroke is compared to the long stroke valves the one smaller in diameter and also shorter Allows sliding pin because the distance between the sliding bolt anchoring in the valve front part and significantly reduce the spring stop at the end of the bolt has. This also reduces the tendency to Vibrations on the self-supporting sliding pin.

The fastening and locking of the baffle ring to the switch insert carrier according to claim 2 simple and cheap, especially for the larger ones Switch inserts. The baffle ring disc can, for example se are manufactured as a stamped part, then all are omitted Drilling.

Will be a particularly large one for relief reasons Storage plate used, then for accommodation the screws no longer have enough space, because the valve housing is already the largest possible Has guide for the switch insert.

The baffle ring with external thread according to claim 3 remedies here and is one simple and cheap solution with this design.

The formation of the baffle ring after the An saying 4 avoids both fastening screws and also an external thread and is therefore extremely cheap deliver, especially if they are also made of plastic is injected.

The embodiment according to the feature of claim 5 represents an even simpler solution for manufacturing and attachment of the baffle plate.

When made from injection molding or similar only needs the manufacturing tool for the switch insert ger be prepared accordingly, then is for the two parts only need one spraying operation.

Then an absolutely central position of the Congestion ring disc reached.

The sealing ring pressed onto the only sealing seat according to claim 6 required in its sealing radio tion for the switch insert no sealing stroke, it will according to the invention as a result of a control valve action a pressure surge against the resistance of the pre strained compression spring directly from its sealing seat raised. The one just in front of the baffle ring disc or already something in this arranged storage plate thereby penetrates this one and glides it contactlessly up to the hy drastic storage pegs.

The slightly protruding sealing edge of the switch insert zes according to claim 7 brings an accurate system of Sealing rings on the sealing seat and enables as a result of Seal elasticity even a slight indentation of the Edge in the sealing ring, making the seal secure rer is.

By training the switch insert after Claim 8 there is the possibility of the switch insert also for special types of compound water toughness learn, for example those with a one-piece Master meter / valve body to use where the switch insert and the measuring insert together a very tight housing opening in the son the housing must be installed. Such an out education shows for example the OS DE 34 29 007 A1. The The short length of the switch insert also enables Use of main counters on the output side only little or no clearance for protruding parts le of a switch insert.

An elastic O-ring according to claim 9 is light on a ring groove and is therefore a be especially approves measure for fastening the sealing all around the switching element.

The arrangement provided according to claim 10 of the sealing ring on the switch insert carrier brings the advantage train that the sealing ring outside the water flow in a neutral zone comes to lie and thereby from little or no washed-up foreign matter cannot be hit.

The one-piece construction of the storage plate with the Guide piece of the switching element according to claim 11 is advantageous when using an O-ring as a sealing ring Adhesive, because the retaining screws and the Assembly of the storage plate.

The storage plate designed as an individual part after Claim 12 is on the guide piece of the switch insert zes fastens and clamps the flat sealing ring so tight that this does not arise from its own without external influence Can release bracket.

The sharp control edge on the outside diameter of the Storage plates according to claim 13 brings a very ge Precise control function on the thin baffle ring. The opening and closing of the changeover valve is there performed by extremely correctly.

Because the spring tension nut in the center of the valve gangs sits, bring the breakthroughs after the approach say 14 more flow cross-section for the water current and thus the courage flows around ter occurring pressure loss is reduced.

A not too big narrowing of the main through gangs in the switch insert compared to the nominal valve size according to claim 15 is already in the known Switching valves have been applied and is also used the switching insert according to the invention an advantage because thereby reducing the opening moment and thus use an even weaker compression spring can, especially with the valves in short construction ge and without protruding switch parts.

By designing the back according to the invention blow / control valve according to claim 16 is the The switch valve is only opened when that Control valve through a strong bypass backflow initiates the start of opening. Up to this point of time is the switching element from the compression spring of the switch set still with little force on the sealing seat presses, a floating state of the switching element with it occurring leaks that lead to measurement errors, is not possible here.  

The plate-mounted on the control valve cone in conjunction with the two traffic jams cylinders inside the control valve the conical compression spring, so that when flowing through the Control valve only a small pressure loss occurs.

The vorese according to claim 17 in the control valve The cross-sectional regulation has the advantage that the beginning of the bypass flow diverting process to Main counter by increasing the cross section be hesitated and by a cross-sectional smaller can be done earlier.

This means that secondary counters are also slightly different appropriate transmission values and therefore somewhat different nominal flow rates for the compound water meter usable.

Based on the drawing, the invention in the form of Exemplary embodiments are explained in more detail: It shows

Fig. 1 is a compound water meter in top view,

Fig. 2 is a longitudinal section through an inventive SLI changeover valve in the closed position,

Fig. 3 shows a longitudinal section through a erfindungsge MAESSEN switching insert in the first open position,

Fig. 4 shows a longitudinal section through a erfindungsge MAESSEN switching insert in the maximum open position,

Fig. 5 is a partial section through an inventive SEN switching insert with an O-ring as a sealing ring,

Fig. 6 shows a longitudinal section through the combined check / control valve in the secondary line in the closed state,

Fig. 7 shows a section through a baffle ring disk with an external thread,

Fig. 8 shows a section through a baffle plate with an outer guide ring and

Fig. 9 is a switch insert carrier with a storage ring disc.

The spring changeover valve 4 shown in FIGS . 1 and 2 has the valve housing 5 with input flange 47 and output flange 48 and the connecting piece (secondary line) 1 for the secondary counter 2 .

When the changeover valve 4 is closed, the water coming from the secondary meter flows into the combined check / control valve 13 , here presses the valve plug 39 against the resistance of the compression spring 49 first towards the front accumulation cylinder 42 in the floating position and then further into the cylindrical extension 43 of the valve housing 41 . After passing through the valve 13 , the secondary meter water flows via the secondary line 1 and the rear housing part 9 to the valve outlet 50 and from here to the water withdrawal point.

In the valve housing 5 of the changeover valve 4 , the complete switching insert 6 , consisting of the switching insert carrier 15 with the sliding bolt 7 , the compression spring 10 and the spring lock nut 36 . The shut-off and switching element 8 , with the guide piece 32 , the sealing ring 28 and the baffle plate 12 with screws 51, can be moved longitudinally on the sliding bolt 7 .

By means of screws 19 , the baffle plate 17 is connected to the switch insert carrier 15 , on the rear side 14 . The retaining ring disk 17 is designed as a short accumulation stage 18 and has the same sheet thickness 16 for all nominal meter sizes et wa.

The cone ring 17 is guided in the solution 20 of the switching insert carrier 15 . The length of the storage channel 11 of the conical ring disk 17 corresponds to its sheet thickness 16 .

The front edge 29 of the sealing ring 28 has in Ven til Close position close contact with the protruding sealing edge 30 of the sealing seat 27 on the main passage 26th The baffle plate 12 has on its outer diameter 33 a control edge 34 which, together with the input 52 and the output 53 of the baffle ring 17, controls the switching movements of the shut-off and switching element 8 .

Before the switching valve 4 , the main counter 3 is arranged, which is connected via the secondary line 1 to the secondary meter 2 .

The spring lock nut 36 with the hub 37 on the sliding bolt end 35 is seated, has openings 38 which facilitate the passage of water.

The operation of the described Umschaltven valve 4 and the check / control valve 13 is as follows:

If the shut-off and switching valve 8 is in the valve closing position, the seal 28 or 31 pressed against the sealing seat 27 by the prestressed compression spring 10 completely shuts off the main passage 26 and the water flowing through the secondary meter 2 flows through the combined check / control valve 13 . the ne benkanal 1 and the rear housing part 9 to the valve outlet 50 and from here to the water tapping point (not shown).

At a predetermined flow, the valve cone 39 of the valve 13 , which is in suspension until then, is pressed into the rear accumulation cylinder 44 and thus accumulates the secondary flow so strongly that its major part is suddenly diverted to the main counter 3 .

The instantaneous pressure drop that occurs then causes an abrupt opening of the changeover valve 4 . The storage plate 12 of the shut-off and switching element 8 is pushed contactlessly through the retaining ring disk 17 and takes up a hydraulic latching position just behind it.

So that the first opening of the switch valve 4 is ended. About increasing the flow to the maximum flow, the switching element 8 then moves in the direction of the valve outlet 50 until the guide piece 32 rests on the hub 37 of the spring nut 36 .

So that the absolute open position of the switching valve 4 is reached.

With a falling flow, the tensioned pressure spring 10 presses the switching element 8 against the resistance of the water flow in the direction of the valve sealing seat 27 until the baffle plate 12 of the switching element 8 reaches the blocking ring disk 17 again.

Here, the switching element 8 takes a new locking position. This is achieved by the narrow stowage gap between the stowage plate 12 and the diameter of the outlet 53 of the conical ring disk 17 .

As a result of the thrust of the tensioned compression spring 10 on the switching element 8 and as a result of the counter-thrust (plate area × differential pressure) that occurs when the baffle plate 12 flows around, there is a temporary state of equilibrium.

If the flow then drops to a predetermined strength, the force of the compression spring 10 overcomes the accumulation phase and the switching element 8 slides as a result of the conical expansion of the baffle plate passage into its closed position.

The preloaded compression spring 10 presses the sealing ring 28 or 31 back onto the sealing seat 27 and the closing process of the changeover valve 4 is thus ended.

The amount of water still flowing is then diverted in reverse form to the secondary counter 2 and recorded by it.

If the water pipe lying in front of the compound water meter is leaking for any reason, then the non-return / control valve in the pipe 1 prevents any backflow, because the compression spring 49 presses the valve cone 39 firmly onto its sealing seat 57 in the valve housing 41 .

A backflow through the main counter 3 prevents in the same situation that from the compression spring 10 on the sealing seat 27 on the main passage 26 from locking and switching element 8 with the sealing ring 28 or the O-ring 31st

The switching insert 6 shown in FIGS. 3 and 4 shows the respective position of the shaft member 8 shortly after the valve opening ( FIG. 3) and with the maximum open position ( FIG. 4).

FIG. 5 shows a guide piece 32 which is connected to the baffle plate 12 to a unit 54 and the resilient O-ring is clamped in the annular groove 31 55th

The combined return blow / control valve 13 shown in FIG. 6, with the housing 41 , the sliding finger 56 , the compression spring 49 and the valve cone 39 , is screwed and sealed into the connecting piece (secondary line) 1 of the Ventilge housing 5 . The Ventilke gel 39 has a plate-shaped collar 40 , which is only slightly smaller in diameter than the inner diameter 45 of the front storage cylinder 42 and the rear storage cylinder 44th

In the first cylindrical and then conical housing expansion 43 , the valve cone 39 takes a waiting position until it is pressed by the secondary flow into the rear accumulation cylinder 44 and thereby generates a back accumulation.

Fig. 7 shows a baffle plate 17 , the outer diameter carries a thread 21 with which it can be screwed into the switch insert carrier.

From Fig. 8 a further baffle washer 17 can be seen, which has a guide ring 22 with which it can be clamped between the holding edge 23 of the switch insert carrier 15 and the stop 24 of the housing recess 25 .

In the embodiment according to FIG. 9, the switch carrier 15 is connected to the retaining ring disk 17 to form a unit 58 .

Claims (17)

1.Compound water meter with a secondary meter ( 2 ) seated in a secondary line ( 1 ), a main meter ( 3 ) and a switch valve ( 4 ) arranged behind the main meter ( 3 ) and acting automatically by means of spring pressure and differential pressure, in its housing ( 5 ) the secondary line ( 1 ) opens out laterally and in which a complete switching insert ( 6 ) is arranged, the shut-off and switching element ( 8 ) of the main line pressure in the valve opening direction, which is displaceably guided in the longitudinal axis of the valve on a sliding pin ( 7 ), and of which in the rear part 9 ) of the valve housing ( 5 ) prevailing, by the low pressure which arises when the auxiliary counter ( 2 ) is running, and by a prestressed compression spring ( 10 ) in the valve closing direction, between the shut-off and switching element ( 8 ) and a switching insert carrier ( 15 ) a as a valve opening aid storage channel ( 11 ) is formed, the shut-off and switching element ( 8 ) from the Schl iessposition is traversed to a latching position and in the secondary line ( 1 ) sits a check / control valve ( 13 ) which also determines the opening process of the changeover valve ( 4 ), characterized in that the switching insert carrier ( 15 ) on its opposite the main counter ( 3 ) Side is associated with a baffle plate ( 17 ), which has the storage channel ( 11 ), that the length of the storage channel ( 11 ) corresponds to the sheet thickness ( 16 ) of the storage ring disk ( 17 ), and that of the shut-off and switching element ( 8 ) path to the rest position is only slightly larger than the sheet thickness ( 16 ). 2. Compound water meter according to claim 1, characterized in that the retaining ring washer ( 17 ) with means of screws ( 19 ) on the switch insert carrier ( 15 ) is fastened and the outside has a fit ( 20 ). 3. Compound water meter according to claim 1, characterized in that the baffle ring ( 17 ) carries a thread ( 21 ) on the outside and is screwed in, the switching insert carrier ( 15 ). 4. Compound water meter according to claim 1, characterized in that the baffle plate ( 17 ) outside has a guide ring ( 22 ) which is clamped between the holding edge ( 23 ) of the switch insert carrier ( 15 ) and the end ( 24 ) of the housing recess ( 25 ) . 5. Compound water meter according to claim 1, characterized in that the retaining ring disc ( 17 ) is integrally connected to the switching insert carrier ( 15 ). 6. Compound water meter according to claims 1 to 5, characterized in that the switching insert ( 6 ) of the switching valve ( 4 ) at its main passage ( 26 ) has only a single sealing seat ( 27 ) to which in the valve closing state on the shut-off and switching gate gan ( 8 ) attached elastic flat sealing ring ( 28 ) with its front edge ( 29 ) even at the moment of valve opening by the force of the preloaded compression spring ( 10 ) is somewhat pressed. 7. Compound water meter according to claim 6, characterized in that the sealing seat ( 27 ) of the switching insert carrier ( 15 ) is provided with a protruding sealing edge ( 30 ). 8. Compound water meter according to claims 1 to 7, characterized in that the switching insert ( 6 ) is of the same length or slightly shorter than the overall length (short length) of the changeover valve housing ( 5 ) and does not protrude from this. 9. Compound water meter according to claims 6-8, characterized in that instead of the elastic flat seal ( 28 ) an elastic O-ring ( 31 ) is used as a sealing element. 10. Compound water meter according to claim 9, characterized in that the respective sealing ring ( 28 , 31 ) can also be attached to the switch insert carrier ( 15 ), the sealing seat ( 27 ) is provided on the shut-off device ( 8 ). 11. Compound water meter according to claim 1, characterized in that a baffle plate ( 12 ) and a guide piece ( 32 ) of the shut-off and switching element ( 8 ) are combined to form a one-piece component. 12. Compound water meter according to claim 1, characterized in that a storage plate ( 12 ) of the shut-off and switching element ( 8 ) is designed as a loose part or individual part and is releasably attached to a guide piece ( 32 ) of the shut-off and switching element ( 8 ) and thereby firmly compress the inner edge of the sealing ring ( 28 ). 13. Compound water meter according to claims 11 and 12, characterized in that the outer diameter ( 33 ) of the baffle plate ( 12 ) has a narrow control edge ( 34 ). 14. Compound water meter according to claim 1, characterized in that one at the end ( 35 ) of the sliding bolt ( 7 ) seated spring nut ( 36 ) outside of its hub ( 37 ) has several openings ( 38 ). 15. Compound water meter according to claims 6 to 14, characterized in that the sealing seat ( 27 ) and the main passage ( 26 ) are somewhat constricted in diameter compared to the nominal valve size. 16. Compound water meter according to claim 1, characterized in that a spring-loaded valve cone ( 39 ) of the combined check / control valve ( 13 ) carries a plate-shaped collar ( 40 ) and a valve housing ( 41 ) of the combined check / control valve ( 13 ) inside has a front ram cylinder ( 42 ) and following a first cylindrical and then conical Ge housing extension ( 43 ) has a rear ram cylinder ( 44 ), the inner diameter of the two ram cylinders ( 42 , 44 ) is slightly larger than the diam ( 46 ) of the plate-shaped collar ( 40 ) on the valve cone ( 39 ). 17. Compound water meter according to claims 16, characterized in that the cylindri cal housing extension ( 43 ) by a regulating device in its flow cross-section can be changed.