EP2365141A2 - Domestic water system - Google Patents

Abstract

The drinking or domestic water system has an interchange point of a public supply network, a supply line (1) for inlet of water and ring line (2) that is guided to consumers (4a,4b,4c,4d). The ring line is attached by a discharge opening (3a) and an insertion opening (3b). A ring line pump (60) is provided in the ring line.

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, preferably 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 hot water is discharged immediately at a consumer water removal 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.

Another system is out of the EP 2 098 645 A1 known. Also in this prior art, the flow through a ring line passes passively through a cross-sectional constriction provided between the discharge opening and the threading opening, which leads to a pressure drop in the supply line, so that a flow results in the ring line.

The known from the prior art solutions for a flow through the loop to the effect that there stagnation of drinking or service water is avoided, require further improvement.

With the present invention, a generic drinking or service water system should be specified, which can reliably prevent stagnation in the loop.

To solve this problem, a drinking or service water system of the type mentioned is proposed with the present invention, which is characterized by a provided in the loop ring line pump. Through this ring line pump leading to the supply line volume flow can be generated in the loop, which leads to a secure and inevitable exchange of the volume in the loop. Accordingly, stagnation can be avoided.

According to a further preferred embodiment of the present invention, a supply line volume flow measuring device is provided with which the volume flow in the supply line can be measured. The measuring signal of this supply line volume flow measuring device can be processed in a control device associated with the ring line pump. By analyzing the flow conditions in the supply line, the ring line pump can be controlled or regulated accordingly with this preferred embodiment.

It is with regard to a good adaptation between the volume flow in the supply line and the volume flow in the loop further preferred to provide a ring line volume flow measuring device with which the volume flow in the loop can be measured and their flow measurement signal in the the ring line pump associated control device is processed. This embodiment serves in particular the purpose to control or regulate the mutual volume flows between the ring line on the one hand and the supply line on the other hand due to the activity of the loop pump. The inventive drinking or The process water system may have a cross-sectional constriction between the extraction and threading, due to which a pressure difference is generated in the supply line, which leads to a forced flow through the loop at a flow in the supply line. Although such a cross-sectional constriction is unnecessary, this should preferably be used to achieve a certain flow in the loop at a volumetric flow acting in the supply line. A fine adjustment can be done by controlling or regulating the loop pump. In any case, however, the volume flow at the threading opening is divided with the present invention into a ring line volume flow and a further volume flow which is not branched off into the ring line and flows in the supply line. These two volume flows unite - if no fluid is removed from the corresponding loop via a connected consumer - in the Ausfädelöffnung. The flow is caused due to the ring line pump even if no fluid is removed from the system via a consumer at all.

Although a certain flow of supply and ring line already leads to a sufficient replacement of the fluid in the loop and thus the contamination of the loop is prevented, it is preferable according to a preferred embodiment of the present invention to provide a ring line temperature sensor, with the water temperature in the loop can be measured. The signal of this ring line temperature sensor can be processed in the control device associated with the ring line pump. Accordingly, the loop pump can be operated temperature controlled. Thus, for example, a rule may be stored in the control device, according to which, especially at higher ambient temperatures, for example in a cold water system, a cyclical flushing of the loop takes place by actuation of the ring line pump. This ensures, for example, in hot summer months at any time that fresh water is present in the loop and germination does not occur there.

According to a further preferred embodiment, a supply line temperature sensor is further provided by which the water temperature in the supply line can be measured and whose signal is processable in the control device associated with the ring line pump. This supply line temperature sensor can be provided alone or in combination with the ring line temperature sensor. By arranging two temperature sensors, one of which is associated with the ring line and the other with the supply line, the degree of purging of the ring line, for example, can be monitored. With effective flow in the supply line and a given temperature difference with higher temperature in the loop, it can be concluded that the volume in the loop is not completely replaced. In view of this, the temperature sensor should be installed at the downstream end portion of the loop.

According to a further preferred embodiment, the control device is designed such that the ring line pump is controllable on the basis of the or the control device discontinued signals. These signals may be the signals to the volumetric flows in the supply and loop lines and / or the temperature values in these two lines. The information about the volume flow can be made for example by measuring a pressure difference over a given flow path, in particular via a throttle. Alternatively, a flow measuring element can also be provided in the supply or ring line.

According to another preferred embodiment of the present invention, wherein the system is provided as a hot water system, it comprises a heat source for heating the water, and further comprises a circulation pump provided in the supply line which circulates water contained in the system. This circulation pump usually comprises a circulation pump control device, which is connected in terms of control with the control device of the ring line pump, so that the two pumps can be operated in a coordinated manner. Accordingly, the two pumps can be operated so that their effects mutually reinforce each other.

Further details of the present invention will become apparent from the following description of an embodiment in conjunction with the drawings.

Figur 1

eine schematische Darstellung eines ersten Ausführungsbeispiels;

Figur 2

eine schematische Darstellung einer Ringleitung;

Figur 3

eine schematische Darstellung eines Kaltwassersystems; und

Figur 4

eine weitere schematische Darstellung eines Kaltwassersystems.

In this show:

FIG. 1

a schematic representation of a first embodiment;

FIG. 2

a schematic representation of a loop;

FIG. 3

a schematic representation of a cold water system; and

FIG. 4

another schematic representation of a cold water system.

FIG. 1 shows a schematic view of a first embodiment of a drinking and service water system with a supply line 1, which is connected to a non-illustrated transfer point for service water from a public utility network, optionally with the interposition of a device for heating the service water. This can be a heat exchanger of a heater. In a hot water network, a boiler can also be integrated in a manner known per se.

At the in FIG. 1 shown embodiment is cold water network. Accordingly, the supply line 1 communicates with the interposition of a conventional water meter and a filter with the transfer point for cold water from the public supply network. To the supply line 1, a plurality of ring lines may be connected, wherein the in FIG. 1 section shown limited to the representation of a loop 2. This ring line 2 is connected via a connection fitting 3 to the supply line. The connection fitting 3 comprises a Ausfädelöffnung 3a and a threading 3b and a flow resistance arranged therebetween. This arrangement of threading opening 3b and Ausfädelöffnung 3a with flow resistance arranged therebetween is designed such that when a flow through the supply line 1 in the ring line 2 preferably a flow is effected by the Venturi effect. A flow in the supply line 1 thus leads to an exchange of standing in the ring line 2 water.

At the ring line 2 more consumers 4 are connected. Between the ring line 2 and the connection fitting 3 are shut-off valves 5, via which the respective ring line 2 can be separated from the supply line 1 for maintenance purposes.

At the in FIG. 1 the embodiment shown, the ring line can be divided into different ring line sections. So there is a loop portion 6, which is the Ausfädelöffnung 3a downstream and leads to a remote consumer 4d. The flow path formed by the first ring line section 6 is the longest flow path between a consumer, a shut-off valve 5 and between the supply line 1 and the corresponding consumer 4d. A second and with reference numerals 7 characterized Ringleitungsabschnitt connects the Einfädelöffnung 3b associated shut-off valve 5 with a nearby consumer 4a. This second ring line section 7 forms the shortest flow path within the ring line 2 between the shut-off valve 5 and the supply line 1 and a consumer 4a. Further ring line sections 8 connect the aforementioned consumers 4a and 4d to further consumers 4b, 4c.

The first ring line section 6 is formed in the embodiment shown with a nominal diameter of DN 15. The other ring line sections 8 and the second ring line section 7 are formed with a nominal diameter DN 12. In this case design it is assumed that pipelines between a nominal size of DN 12 and a nominal size of DN 15 are not available. Both nominal diameters are suitable for conducting a sufficient volume flow of service water to the individual consumers 4a to 4d, provided that water is removed from the corresponding consumers 4a to 4d.

The connection fitting 3 is preferably a connection fitting which has means for varying the passage area in the cross-sectional constriction, as a result of which the pressure difference achievable via the cross-sectional constriction can be changed dynamically, as is the case with Applicant DE 20 2007 009 832 U1 is disclosed, the disclosure of which is hereby incorporated by reference into this application. The connection fitting disclosed therein will hereinafter be referred to as "dynamic connection fitting", since this allows the ratio of pressure difference to flow rate through the supply line to be changed so that even at relatively low flow rates, a relatively high pressure difference is effected, resulting in a flow through the Ring line 2 leads.

At the in FIG. 1 In the embodiment shown, for example, when consumer water is withdrawn from the consumer 4a, the corresponding service water is supplied essentially via the threading opening 3b, whereas when it is removed from the consumer 4d, the water withdrawn therefrom is supplied essentially via the discharge opening 3a. Usually, water is led to the corresponding consumer on both sides through the ring line 2 during removal. Substantial volume flows through both ring line sections 6 and 7, 8 are in particular at a removal of water to the consumer 4b and the consumer 4c a. In this case will the service water supplied via both the Ausfädelöffnung 3a and 3b via the Einfädelöffnung. By appropriate hydrodynamic design, the line cross-sections compared to a conventional configuration, in which the supply exclusively via the Einfädelöffnung 3a and the Einfädelöffnung 3b only serves to return the flow through the loop 2 and therefore the return line is formed with a smaller diameter can be reduced. It is also possible to design the entire ring line 3 of line sections with identical or nearly identical nominal diameter. This simplifies the installation of the drinking or domestic water system. Furthermore, assembly errors are largely excluded. Overall, the piping volume is lower than in the conventional installation. This results in particular better hygienic conditions.

In accordance with FIG. 1 shown embodiment can be assumed that the supply line is provided as a riser several floors of a building enforcing, whereas the in FIG. 1 shown ring line the wet cell of a residential unit or a residential unit in total pictures.

This in FIG. 1 embodiment shown has in the ring line 2 adjacent to the Ausfädelöffnung 3b a ring line pump 60 which is provided between this Ausfädelöffnung 3b and the associated check valve 5. In the supply line 1 and the threading opening 3a upstream in the flow direction is a measuring point M1, for measuring the volume flow in the supply line 1 and for measuring the prevailing temperature of the flowing fluid there. Instead of the connection fitting 3 upstream, the measuring point can also proceed downstream in the supply line 1 of this connection fitting 3 (see M2). Further, in the supply line 1, a circulation pump 61 is provided, with which the water in the system, which is hot water, circulates in the system.

Between the shut-off valve 5 and the threading opening 3a there is another measuring point MR provided in the ring line for measuring the volume flow in the ring line 2 and for measuring the temperature of the water in the ring line 2.

The measurement signals for the volume flow and the temperature measured at the measuring points M1 or M2 and MR are fed to a control which acts on the respective pumps 60 and 61, respectively.

The opposite shows in the FIG. 2 shown embodiment, a schematic view of a loop 10, which is designed as a riser and two substantially parallel ring line sections comprises, which are formed as risers substantially parallel to each other and provided, for example, in a supply shaft of a building represented. Each of the ring line sections 11, 12 has a plurality of terminals 13 for consumers, not shown, wherein between the consumers and the respective terminals 13 close to the terminals 13 shut-off valves 14 are provided. The ring line 10 is also in this embodiment of a connection fitting 3 of a supply line 1 and is connected via shut-off valves 5 at the respective inlet and outlet openings 3b, 3a. The terminals 13 are alternately formed on the portion 11 and the portion 12 in the height direction, respectively.

In this embodiment, the usual main flow in the supply line is indicated by an arrow H. With this flow, there is a circulation of the ring line 10, wherein the circulation begins at the Ausfädelöffnung 3a and via the pipe sections 12, 11 leads to the threading 3b. In the case of water removal by the lowest consumer at the lowest connection 13.1, the withdrawn water is almost predominantly supplied via the discharge opening 3a. When removed over the overlying connection 13.2, at least the main part of the flow is supplied via the threading opening 3b.

In this embodiment, in the flow direction of the connection fitting 3 upstream of the measuring point M1 for measuring the temperature and the volume flow in the supply line 1 is provided. The ring line pump 60 is located immediately downstream of the threading opening 3a in the flow direction. The measuring point MR associated with the ring line 2 is located upstream of the discharge opening 3b and the associated shut-off valve 5. Downstream of the connection fitting 3 in the main flow direction H, a measuring point M2 is shown as an alternative to the measuring point M1. Also there, temperature and / or flow rate can be measured and a central control device, which acts on the loop pump 60 and the circulation pump 61, are supplied.

This in FIG. 2 embodiment shown represents a cold water system. A circulation pump is missing.

The FIG. 3 shows a further embodiment of a chilled water system with a main line 20, which opens at a distributor 21. From there go through the interposition of valves 22, 23 riser strands 24, 25 from. The valve 22 is a manually operated valve for shutting off the riser string 24; the valve 23 is a motor-operated valve for shutting off the riser string 25 and for actuating the flushing operation in conjunction with a motor-controlled flushing valve 26, whose function will be discussed later.

At the in FIG. 3 shown embodiment, a building with three floors with corresponding floor strands 27.1 to 27.3 shown. The respective floor strands 27 pass through as supply line several connection fittings with threading and Ausfädelöffnung. In each of the floor strands 27.1 to 27.3 is a motor-driven shut-off valve 28.1 to 28.3. The respective ring lines 2 are shown only with their associated shut-off valves 5, wherein the representation of the consumer was dispensed with these ring lines 2. It may be assumed that each of the ring lines 2 leads to a wet room in a hotel or a hospital with several cold water consumers.

The floor strands 27.1 and 27.3 communicate with the two riser strands 24 and 25, whereby a ring line is formed, which opens into the manifold 21.

On the side facing away from the distributor 21 of the flow path with respect to the valve 23 is in the immediate vicinity of the motor-driven valve 23, a branch 29, which leads to a purge line 30 with a smaller nominal diameter, which can be opened and closed via the motor-driven flush valve 26 , This purge line 30 opens into a sewer system.

During normal operation, the respective motor-driven shut-off valves 28 are open. In the event that, for example, a consumer is opened on the ring main 2.1.1, the supply of this consumer with service water takes place essentially via the riser 24. If a consumer associated with the ring 2.1.8 open consumer, the supply of hot water via the riser pipe 25. If a consumer assigned to the central loop lines 2.1.4 or 2.1.5 is to remove water used, it flows almost equally through the riser strands 24 and 25. The corresponding ratio of the individual water flows changes with increasing distance from the corresponding riser strands. Thus, when removing from the loop 2.1.2, the majority of the service water is supplied via the riser pipe 24, whereas a small portion of the volume flow from the riser pipe 25 is fed.

At the in FIG. 3 illustrated embodiment is assumed that because of minor occupancy of the building an exchange of water is desired, which is in the upper floor section 27.3 and the associated ring 2.3. In this case, the motorized shut-off valves 28.1 and 28.2 are closed. Also, the valve 23 is closed. By opening the purge valve 26, rinse water is conveyed via the riser string 24 only into the upper floor string 27.3 and flows via the branch 29 into the purge line 30 and into the wastewater. A flow and thus an unnecessary consumption of water in the other floor strands 27.1 and 27.2 is avoided.

The measuring points M1 and M2 can optionally be provided. Also, the arrangement of the loop pump 60 and the measuring point MR can be exchanged with each other.

At the in FIG. 4 shown embodiment, several laid in the vertical direction riser sections 31.1 to 31.4 are provided. At the upstream end of the respective strands 31 are shut-off valves 33 which are provided between the individual strands 31.1 to 31.3 and a horizontal distribution line 34. The individual riser strands 31.1 to 31.4 pass through four superimposed floors in the embodiment shown. For reasons of simplified illustration, only a single wet cell 35 is shown schematically, which is connected via a ring line 10, which comprises the measuring point MR and the ring line pump 60. For the upper floor all ring lines 10 are shown schematically. The underlying wet cells with the associated loops are not shown, however, exist. The corresponding embodiment is only indicated by the discharge opening 3b provided on the floor. Motor-controllable valves 36 are located at the upper end of the three left-hand strands 31.1 to 31.3. These valves 36 are provided between the individual strands 31.1 to 31.3 and the distribution line 34, whose distal end is connected to the last strand 31.4 a flow falling in the vertical direction leads and is connected at its end with a likewise controllable, ie motor-operated flushing valve 37, which leads to a discharge point.

Every single one, according to the embodiment FIG. 4 provided ring lines 10 has a ring line pump 60. In each individual ring line 10, ie also the not shown ring line 10 to a wet cell 35, a measuring point MR is further provided. Finally, in each individual strand 31.4 to 31.1, in each case one measuring point M1, for example the threading opening 3a, can be arranged upstream in the flow direction of the strand 31.

LIST OF REFERENCE NUMBERS

1

supply line

2

loop

3

End fittings

3a

threading aperture

3b

Ausfädelöffnung

4

consumer

5

shut-off valve

6

First loop section

7

Second loop section

8th

further loop sections

10

loop

11

Ring line section

12

Ring line section

13

connection

14

shut-off valve

20

Main line (cold water)

21

distributor

22

Valve

23

Valve

24

Flowline / train

25

Flowline / train

26

flush valve

27.1 - 27.3

Floor strands

28.1 - 28.3

Shut-off valves

29

junction

30

flushing line

31

Tubing string

33

shut-off valve

34

distribution line

35

wet

36

Motor-driven control valve

37

flush valve

60

Loop pump

61

circulation pump

M1

First measuring position in supply line (volume flow, temperature)

M2

Second measuring position in supply line (volume flow, temperature), alternative to M1

MR

Measuring point in the loop

Claims (9)

Drinking water or service water system with a transfer point from a public supply network and at least one supply line (1) for the supply of water and at least one to at least one consumer (4) leading ring line (2) via a outgoing from the supply line Ausfädelöffnung (3a) and a threading opening (3b) opening into the supply line is connected to the supply line (1),
marked by,
a ring line pump (60) provided in the ring line (2). Drinking or service water system according to claim 1, wherein between the Ausfädelöffnung (3a) and the Einfädelöffnung (3b) in the supply line (1) is provided a cross-sectional constriction, so that when flowing through the supply line (1) in the ring line (2) causes a flow becomes. Drinking or service water system according to claim 1 or 2, characterized by a supply line volume flow measuring device (M1) with which the volume flow in the supply line (1) is measurable and the volume measurement signal in one of the ring line pump (60) associated control device is processed , Drinking or process water system according to claim 2 or 3, characterized by a ring line volume flow measuring device (MR), with which the volume flow in the supply line (1) is measurable and the volume measurement signal in one of the ring line pump (60) associated control device is processed , Drinking or process water system according to one of the preceding claims, characterized by a supply line temperature sensor, through which the water temperature in the supply line (1) can be measured and the signal in one of the ring line pump (60) associated control device is processed. Drinking or process water system according to one of the preceding claims, characterized by a ring line temperature sensor (MR), through which the water temperature in the supply line (1) can be measured and the signal in one of the ring line pump (60) associated control device is processed. Drinking or process water system according to one of the preceding claims, characterized in that the control device is designed such that the ring line pump (60) due to the or the control device discontinued signals is controllable. Drinking or service water system according to one of the preceding claims, characterized in that the system is designed as a hot water system with a heat source for heating the water and in that the supply line (1) a circulation pump (61) is provided which circulates water in the system. Drinking or process water system according to one of the preceding claims, characterized in that the circulation pump (61) comprises a circulation pump control means which communicates with the control means in terms of control.

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