EP2233648B1 - Drinking and domestic water system - Google Patents

Description

The present invention relates to a drinking or service water system with a transfer point from a public supply network and at least one supply line for the supply of water and at least one loop leading to at least one consumer. This ring line is connected to the supply line via inlet and outlet openings, wherein a cross-sectional constriction is provided in the supply line between the extraction and threading openings. The cross-sectional constriction is designed such that when flowing through the supply line in the loop line a flow is effected, due to the Venturi effect.

The drinking or service water system according to the present invention may be a cold or a hot water system. Modern hot water systems are formed with a circulation, which ensures that hot water heated by a heater is continuously circulated in the lines leading to the consumer, so that when a water is removed from the consumer hot water is discharged immediately and germination of the system, for example by Legionella is avoided. The circulation prevents the cooling of hot water in the line. In hot water circulation systems, the circulation leading away from the consumer and connecting them to the heater or a boiler of the heater with a smaller diameter than the supply line is formed. The reason for this is due to the fact that through the supply line as a consumption line, a high flow rate must flow through with water removal, whereas in the circulation line only such a flow must be performed, which ensures a constant replacement of the hot water in the lines of the hot water system.

A generic drinking or service water system is for example from the DE 10 2006 017 807 known to the present applicant. In this prior art several ring lines go from a supply line, which communicates with the interposition of a motor-driven valve with a purge line leading to a discharge point to the dirty water line. With this configuration, it is possible to flush a supply line to dissipate stagnant water there.

Also in this prior art drinking or service water system leading to the Einfädelöffnung line sections of the loop are formed with a smaller diameter, so that in the case of a flow in the supply line, there is one, albeit slight flow in the connected loop lines.

From the date of the applicant DE 20 2007 009 832 U1 a connection fitting for connecting a ring line to a supply line is known, which receives a movable throttle element, which cooperates with a return spring and is accordingly movable depending on the pressure difference across the throttle element, depending on the pressure difference to achieve a predetermined flow through the loop.

A method and a device for influencing the circulation in a hot water circuit with thermostatic valves discloses the EP 1 681 515 A1 ,

Despite hydrodynamically correct design such that a sufficient flow through the loop can be achieved due to a flow in the supply line, case designs are conceivable in which an exchange of standing in the loop water can not always be guaranteed due to a flow in the supply line. This leads, for example, in a hot water system that in the ring line, the flow rate is too low and the water cools down there, so that when a withdrawal of hot water to the consumer for a long time initially cold water is discharged from the corresponding consumer and the risk of contamination , in particular with legionella. In a cold water system, it can happen that a microbial contamination with pseudomonads occurs in the loop, which find good growth conditions due to insufficient flow through the loop especially in warm countries or in midsummer.

The present invention has for its object to provide a solution to the above problems.

To solve this problem, a drinking or service water system with the features of claim 1 is proposed by the present invention.

According to the invention, a movable throttle element is provided, which is movable relative to the cross-sectional constriction and is held by a guide element, which is inserted into a main flow leading pipe. By such a throttle element, the effective flow cross-section in the flow line and thus the volume flow conditions between the main flow and the annular flow can be changed.

This throttle element according to the invention is movably held in a guide element. This guide element and the throttle element are preferably formed coaxially with each other. The longitudinal axis of the guide element and the longitudinal axis of the throttle element are preferably aligned with the longitudinal axis of the strand.

According to the present invention, a biasing means is provided for spacing the throttling element from the guide element, which is arranged such that it is acted upon by the ring flow flowing through the threading opening and whose restoring force is variable due to the temperature of the ring flow. Such a biasing means is a spring element made of plastic memory with the temperature within the conceivable temperature values takes different forms, this temperature-induced deformation can be used to change the flow resistance.

Preferred embodiments of the invention are specified in the dependent claims.

Figur 1

eine Längsschnittansicht einer Anschlussarmatur zum Anschluss an eine Versorgungsleitung und eine Ringleitung;

Figur 2

das in Figur 1 eingekreiste Detail C in vergrößerter Darstellung;

Figur 3

eine perspektivische Ansicht eines Einsatzteiles des Ausführungsbeispiels mit dem Strömungseingang in der Ausgangsstellung des Drosselelementes;

Figur 4

eine perspektivische Seitenansicht gemäß Fig. 2 in der voll geöffneten Stellung des Einsatzteiles und

Figur 5

eine perspektivische Seitenansicht des in Fig. 1 gezeigten Einsatzteiles mit dem Strömungsausgang.

The present invention will be explained in more detail by means of exemplary embodiments in conjunction with the drawing. In this show:

FIG. 1

a longitudinal sectional view of a connection fitting for connection to a supply line and a ring line;

FIG. 2

this in FIG. 1 circled detail C in an enlarged view;

FIG. 3

a perspective view of an insert part of the embodiment with the flow input in the initial position of the throttle element;

FIG. 4

a perspective side view according to Fig. 2 in the fully open position of the insert part and

FIG. 5

a side perspective view of the Fig. 1 shown insert with the flow outlet.

The FIGS. 1 to 2 show an insert 2, which may be formed of metal or plastic and which is formed with a cylindrical outer peripheral surface substantially corresponding to a cylindrical inner peripheral surface of a valve body 4. The in FIG. 1 drawn arrow H illustrates the flow direction of a flowing through a dashed lines supply line 1 main stream. A flowing through a ring, not shown ring flow ring is marked with reference R.

As the FIGS. 3 to 5 can be seen, at the front end in the flow direction of the insert part 2 a plurality of circumferentially distributed webs 6 are provided, which continue the cylindrical outer peripheral surface and are funnel-shaped inwardly directed at its free end. A corresponding embodiment also has the end remote from the flow. There, the webs are marked with reference numeral 8.

This area of the insert part 2 forms a guide element 10 for a throttle element 12. Between the front webs 6 and the rear webs 8, the insert part 2 a ring portion 14, the inner peripheral surface of which forms a conical surface 16 which cooperates with a conical surface 18 of the throttle element 12. In the sectional view of Figures 1 and 2 For example, a nozzle cross-section formed by the ring section, which forms a cross-sectional constriction V with respect to the main flow H, is projected radially inwardly from the webs 6. In other words, the nozzle has at its narrowest point a larger diameter than the inwardly drawn webs 6, which form a stop for the throttle element 12.

In the area of the rear end of the annular portion 14 in the flow direction, a plurality of locking lugs 20 are formed on the outer peripheral surface, which engage in locking grooves 22, which are recessed on the inner peripheral surface of the valve body 4. Downstream of the latching lugs 20 and held by each second of the rear webs 8, a ring 24 is provided, which comprises the throttle element 12 and circumferentially leads, and forms a support surface 26 for a spring element 28, which extends between this ring 24 and an annular surface 30 of the throttle element 12 extends, which adjoins in the flow direction immediately behind the conical surface 18 of the throttle element 12.

The tapered inwardly tapered free ends of the webs 6, 8 form in the embodiment shown a funnel-shaped opening, the penetration of a in the FIGS. 4 and 5 shown inner tube 32 of an inliner facilitates. This funnel-shaped opening has a diameter approximately corresponding to the outer diameter of the inner tube 32. The inner diameter of the nozzle at its narrowest point is about 15 to 25% larger than the diameter of the funnel-shaped opening.

The inner tube 32 passes through a central bore of the throttle element 12. This is presently guided by the inner peripheral surface of the ring 24 and in the flow direction S adjoining webs. Selected webs can engage in axial grooves, which can be formed on the outer peripheral surface of the throttle element 12, whereby an anti-rotation of the throttle element 12 is formed.

Like that Figures 1 and 2 can be seen, is the insert 2 with its guide member 10 in the region of a threading 34 of a ring line, not shown, the upstream of the insert part 2 with a Ausfädelöffnung 36 from the supply line, to one or more consumers, such as a wet room in a hotel leads, and is returned in the area of the connection fitting in the supply line. The circumferentially spaced rear lands 8 thus form a ring flow passage 38 through which the ring flow can flow radially inwardly to unite with the main flow H. The main flow H is understood to mean the flow in the supply line between the discharge opening 36 and the threading opening 34.

In an initial position, in which the conical mating surface 18 of the throttle element 12 abuts against the conical surface 16 of the cylindrical portion 14, a leakage flow gap remains between the adjacent conical surfaces 16, 18, so that at a pressure difference acting above the maximum cross-sectional constriction even with adjoining conical surfaces 16, 18th a certain leakage flow is possible. However, the cross-sectional constriction V can also be such that with minimum pressure difference, the main flow H is cut off and the remaining volume flow flows solely through the loop.

With increasing pressure difference across the cross-sectional constriction, the throttle element 14 is urged against the force of the spring element 28 in the flow direction to the rear. As a result, the cross-sectional constriction V is increased until the throttle element abuts against the front end of the guide formed by the guide 10. This is in the present case formed by hook-shaped radial projections 40 of the rear webs 8.

In the exemplary embodiment shown, the annular flow R in the region of the threading opening 34 passes over the spring element 28. In the region of the spring element 28, a mixing of water of the main flow with water of the ring flow R results in an effective ring flow. The spring element 28 is formed from a plastic with memory ,

LIST OF REFERENCE NUMBERS

1

supply line

2

insert

4

fitting housing

6

Stege

8th

Stege

10

guide element

12

throttle element

14

ring section

16

conical surface

18

Cone counter surface

20

locking lugs

22

locking grooves

24

ring

26

support surface

28

spring element

30

ring surface

32

inner tube

34

threading aperture

36

Ausfädelöffnung

38

Loop flow passage

40

radial projections of the webs 8

H

mainstream

R

annular flow

V

Cross-sectional narrowing

M1

Temperature measurement point

M2

Temperature measurement point

Claims (8)

1. Drinking water or domestic water system comprising a delivery point from a public supply network, at least one supply line (1) for supplying water and at least one ring line that leads to at least one consumer and is connected to the supply line (1) via a diverging opening (36) and a merging opening (34), a cross-sectional narrowing (V) being provided in the supply line (1) between the diverging opening (36) and the merging opening (34), such that a ring flow (R) is brought about in the ring line when there is a volumetric flow in the supply line (1), a movable restriction element (12) being provided that is retained by means of a spring element (28) so as to be positionable relative to the cross-sectional narrowing (V) in a guiding element (10) that is inserted into a pipe (4) which guides a main flow (H), the main flow (H) flowing through the supply line (1) between the diverging opening (36) and the merging opening (34) and moving the restriction element (12) depending on the volumetric flow,
   characterised in that the spring element (28) is a means for positioning the restriction element (12) according to the temperature in the ring flow (R), and is made of a plastics material that has memory ability and assumes shapes which vary according to temperature within the conceivable temperature values, it being possible for said temperature-dependent deformation to be used for changing the flow resistance, such that the volumetric flow ratio between the ring flow (R) and the main flow (H) can be changed by positioning the restriction element (12).
2. Drinking water or domestic water system according to claim 1, characterised in that a fittings housing (4) is provided that forms the merging opening (34), the diverging opening (36) and connections for the supply line (1), and receives an insertion part (2) therein that shapes the guiding element (10) and the cross-sectional narrowing (V).
3. Drinking water or domestic water system according to claim 2, characterised in that locking means (20) are provided on the outer periphery of the insertion part (2), owing to which means the insertion part (2) is held in the fittings housing (4) of the connection fitting which forms the inlet and outlet openings together with the merging opening (34) positioned therebetween.
4. Drinking water or domestic water system according to the preceding claims, characterised in that leakage may flow through the supply line (1) when the restriction element (12) is resting on the cross-sectional narrowing (V).
5. Drinking water or domestic water system according to any of the preceding claims, characterised in that the restriction element (12) is held in a starting position in the region of the cross-sectional narrowing (V), thus forming a leakage flow gap.
6. Drinking water or domestic water system according to any of the preceding claims, characterised in that the cross-sectional narrowing (V) is formed by a taper, and in that the restriction element (12) forms a tapering counter-surface (18) that interacts with a tapering surface (16) of the taper.
7. Drinking water or domestic water system according to any of the preceding claims, characterised in that the restriction element (12) comprises a through-hole which extends in the longitudinal direction thereof and through which an inner pipe (32) of a pipe-in-pipe circulation line can be guided.
8. Drinking water or domestic water system according to either claim 2 or claim 3, characterised in that the insertion part (2) comprises, on at least one of the end faces thereof, a plurality of support projections (6, 8) that surround the outer peripheral surface of the insertion part (2), extend in the axial direction and have funnel-shaped ends.

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