DK2264251T3

DK2264251T3 - Drinking and domestic water system and method for operating such a system

Info

Publication number: DK2264251T3
Application number: DK10010597.2T
Authority: DK
Inventors: Ulrich Petzold; Raimund Peters
Original assignee: Gebr Kemper Gmbh + Co Kg Metallwerke
Priority date: 2006-04-13
Filing date: 2007-04-13
Publication date: 2016-11-07
Also published as: EP2264251B1; EP2264251A2; EP1845207A1; EP1887150B1; SI2264251T1; EP1845207B1; EP1887150A3; DE102006017807A1; DE102006017807B4; PL2264251T3; DK1887150T3; EP1887150A2; EP2264251A3; SI1845207T1; PL1845207T3; PL1887150T3

Description

Drinking and domestic water system and method for operating such a system

The following invention relates to a drinking or service water system having a delivery point from a public drinking water supply network and having at least one storey or riser pipe string as well as several pipes which are arranged one behind another in the direction of extension of the string, lead in each case to at least one extraction point and branch off from the string.

The present invention proceeds, for example, from a water system according to DE-U-93 02 446 or DE-U-8915477. The drinking or service water system of DE-A-19631403 is also viewed as genus-forming with regard to the preamble features of Claim 1.

The present invention relates in particular to a drinking and service water system in a building. A storey string is to be understood in terms of the invention in particular as a horizontally extending pipe which supplies a group of or all of the rooms of a storey, for example of a hotel or a hospital, with drinking or service water. A rising pipe connects different storeys of a building together and usually extends exclusively in a vertical manner. Pipes, which supply wet cells of the building, which are usually arranged one above another, with drinking or service water, branch off from the rising pipe string. The present invention can be realized as a cold water system; it is also conceivable, however, to realize it as a hot water system. In this case, the invention especially wishes to provide a corresponding drinking or service water system without permanent circulation.

In the case of the above systems in a building, the problem arises that when drinking or service water is not extracted at a consumer, the water stagnates in the pipe. If, for example, water is extracted at a front consumer of the string in the direction flow, only the pipe portion of the water system which leads to said front region is traversed. The same happens in the case of a rising pipe string when water is only extracted in a bottom storey. The water standing in the remaining portion of the string runs the risk of contamination.

The problem underlying the present invention is to provide a drinking or service water system which ensures as hygienic an operation as possible and with which the risk of contamination is able to be countered in an effective manner. In addition, the present invention wishes to provide a method for operating a drinking or service water system by means of which the risk of contamination of the drinking or service water system is able to be efficiently countered.

For the device-related solution to the above problem, the present invention provides a drinking or service water system with the features of Claim 1. Said drinking or service water system has at least one storey or riser pipe string which is supplied by means of a delivery point from the public drinking water supply network. Several ring pipes, which lead in each case to at least one consumer, are arranged one behind another in the direction of extension of the string. Said ring pipes branch off from the string at a branch and open out in the string at a mouth which is located behind the branch in the direction of flow. In addition, a controllable valve which, in the open state, enables a flow in the string and which connects the drinking or service water system to an output point for used water to the public wastewater network, is provided on the rear end of the string in the direction of flow. The controllable valve can be operated in different ways in order to ensure a flow in the entire string at predetermined intervals even when no water is extracted from the string or it is extracted via just one single ring pipe. The controllable valve is a valve which is adjustable by means of a control signal and, for example, can be a motor-driven valve which is provided with a servomotor. As a result of opening the controllable valve, the water standing in the string, including the ring pipes connected thereto, can be replaced and removed into the wastewater drainage network. The risk of contamination of the string is consequently countered in an effective manner.

According to the present invention, the ring pipes and a branch and/or a mouth of the respective ring pipes are formed on the string such that, in the case of drinking or service water being extracted at a consumer connected to the string, a pressure difference is generated by a flow in the string between the branch and the mouth or the ring lines of the string, by way of which pressure difference a flushing flow is generated in the one or more ring pipes positioned upstream of the consumer in the flow direction and assigned to the consumer. The flow in the drinking or service water system is in this case effected solely by the difference between the pressure of the delivery point and of the output point or the extraction point. In other words, the present invention proposes, by way of its coordinate aspect, a passive drinking or service water system which makes do without a pump and which realizes a flow in the system. The flow in the system is effected solely by the pressure potential which prevails owing to the positive pressure at the delivery point in relation to the pressure at an extraction point. According to the coordinate aspect of the present invention, the driving force for a flow within the drinking or service water system is accordingly solely the positive pressure in the line system, which positive pressure prevails in said line system via the public network. The drinking water system according to the invention is accordingly designed such that the ring lines positioned upstream of a ring line with consumers utilized for water extraction are traversed by a flushing flow owing to the pressure difference in the string. Here, the pressure difference is effected owing to the flow, generated in the string, to the consumer. In the case of a hotel, only the last hotel room in the flow direction must be equipped with an associated wet cell in order that, when water is extracted at said room, flow passes through the entire storey string of the associated hotel storey. In this way, it is possible in an effective manner to prevent contamination in all of the ring lines arranged on the string.

By way of the present invention, a drinking or service water system is to be provided which ensures in a simple manner that a consumer is able to tap fresh water in each case at an extraction point. A controllable valve, i.e. in general a motor-driven valve, which is able to provide a through-flow and consequently replace used water for fresh water, is provided for this purpose according to the first alternative of the present invention. This also includes, for example, providing fresh cold water at the extraction points. In this case, the present invention wishes to provide a drinking or service water system which is designed in as simple a manner as possible. Said drinking or service water system is to manage without a circulation pump or the like. According to the coordinate aspect of the present invention, the flow in the drinking or service water system is correspondingly brought about as a result of the difference between the pressure at the delivery point and the pressure at the output or extraction point. This means that the drinking or service water system according to the invention is, in particular, a passive system where a circulation pump which provides for constant through-flow is omitted. However, a corresponding circulation pump can certainly be part of the drinking or service water system in conjunction with a controllable valve. With the present invention, however, the water is to be replaced in the system in particular as a result of the output at the output point or an extraction at the extraction point driven by the relative overpressure at the supply point, i.e. the delivery point from the public network into the drinking or service water system. Correspondingly, the present invention preferably wishes to avoid cleaning the water contained in the system as a result of circulation and channelling by a water preparation process, as is disclosed in DE-U-93 02 446 or DE-U-89 15 477. In the case of said previously known prior art, the flow through ring pipes is certainly brought about by a Venturi effect. The flow through the entire drinking or service water system is effected, however, in the case of said prior art by means of a pump which circulates the water contained in the system and treats it, in particular decontaminates it, in a separate treatment system. Correspondingly, the pipe systems described in the disclosed prior art are to be understood in terms of the present invention as active systems with a circulation pump and active water treatment systems, whereas the present invention proposes a passive system where a pump and/or a water treatment system is to be omitted. This does not mean, however, that a drinking or service water system with a pump or a water treatment system inevitably drops out of the protected scope of the patent.

The invention specifies a drinking or service water system which can be flushed in an effective and targeted manner both by way of targeted extraction at a consumer and by adjustment of the controllable valve. Should, for example in the case of a hotel, a whole floor be unoccupied for a longer period, the string as well as the ring pipes connected thereto are able to be traversed as a result of actuating the controllable valve which is situated on the end of the corresponding string in the storey.

The ring pipes and the branch to the respective ring pipe or the mouth of the respective ring pipe into the string are dimensioned such that a flushing flow is produced in the ring pipes whenever, when water is extracted at a consumer which is connected to the string by means of a ring pipe which is arranged downstream fluidically of said ring pipes, a pressure difference is generated between the branch and the mouth, by means of which a flushing flow is generated in the ring pipes connected upstream. A hand washbasin, a toilet, a bath tub or also a shower are considered, for example, as usual consumers. Leakage flows, that is to say, for example, a dripping water tap, are usually not deemed to be sufficient. The flow at the consumer must be substantial, i.e. must correspond to a usual extraction at the consumer. The idea currently being considered is to remove approximately 10% of the volume flow through the string into the respective ring pipe on account of the pressure difference. Such a flow volume is deemed to be sufficient to traverse the ring pipe sufficiently and in this connection to replace the water stagnating there. Through the ring pipe, the water guided in the drinking or service water system is brought very close to the respective consumer connected to the ring pipe such that almost all the water stagnating in the ring pipe is replaced.

In the present application, a pipe which extends in a storey and is substantially continuous is also designated as a “string”, namely a storey string. This occurs in the present application for reasons of clear technical teaching. Such a storey string in terms of the application is designated in the specialist world as a distribution pipe.

According to a preferred further development of the present invention, the controllable valve is assigned to a consumer which is connected to the ring pipe which is provided in the string end region. The string end region is deemed to be in particular the end of the string at which the last ring pipe in the direction flow is connected. The controllable valve can be, for example, an indirectly controllable valve, e.g. a toilet flush with a cistern. Such valves are usually closed by means of a floater. The flushing means can have, for example, an actuatable trigger such that once the triggering of the cistern has been actuated, water flows away in a manner known per se and the valve is closed by the floater, i.e. indirectly once the trigger has been actuated in a controlled manner. As shown by said example, even in the case of an indirectly controlled valve, there is inevitably a flow through the string. In the case of said example, however, the valve is not directly driven but rather a trigger lever of the toilet cistern which indirectly brings about the actuation of the valve. Water then flows away initially as a result. The valve bringing about the flow in the string is then opened for filling the cistern. The embodiment described previously simplifies structural expenditure for realizing the service or wastewater water system according to the invention and increases the safety of the user as the water that is possibly contaminated is removed into the wastewater system by means of the wastewater pipe of the toilet. Consequently, it is particularly suitable for avoiding contamination of the drinking water in the case of apartments that lie empty over longer periods.

In the case of a further preferred development, the controllable valve is provided on the string end and connects the string to a connecting pipe. By actuating the controllable valve which is provided on the string end, the string is traversed and, in this connection, preferably all the ring pipes which are connected by means of the string are flushed through. If several strings are provided one above another in the case of storey strings or side by side in the case of riser pipe strings, in each case one controllable valve can be provided on each string end. As a result of actuating the controllable valves at the same time or in a staggered manner, said strings can be traversed simultaneously or staggered in time, water stagnating for a longer period in the string and in the associated pipes thereby being changed and replaced by fresh water. For a centrally controlled flush, it is proposed according to a preferred further development of the present invention to provide a wastewater pipe, on its rear end in the direction of flow which follows the connection of all the strings, with a controllable, for example motor-driven, flushing valve which leads to the delivery to the public wastewater drainage system. Using such a flushing valve, it is possible to flush through the entire service or wastewater system as a result of a one-off actuation of one single valve. Insofar as individual controllable valves are provided on the end of the respective strings over and above this, the flushing of the drinking or service water system can be restricted to such regions in which the water provided over the region has stood for a longer period on account of different usages in relation to other regions. A central flush through all the strings is made possible in a simple manner as a result of all the strings being looped, i.e. all the strings are connected together by pipes which extend transversely to the strings. As a result of suitable usage concepts, in particular as a result of activating consumers in the furthest string in the direction of flow, it is possible to achieve the necessary flush through the drinking or service water system by using a consumer on the strings connected upstream in each case and preferably the ring pipes connected thereto. When, for example, in the case of a hotel that is only used seasonally, a single controllable valve is provided on the end of looped strings, the entire drinking or service water system in the hotel can be traversed as a result of actuating the controllable valve.

The controllable valve or valves can be controlled in different ways in order to enable a cyclical, where applicable, purely need-dependent flushing through of the, or of all of the strings. In the case of a particularly simple development, each controllable valve is time-controlled, for example by means of a battery-driven time module which is provided directly on the controllable valve. Such a development is able to dispense with all the cabling expenditure for central control of the controllable valves.

With regard to need-oriented flushing of individual or of all of the strings, it is, however, to be preferred when the controllable valves are actuated by means of a central control unit. In said control unit, the past occupancy for example of a hotel can be taken into consideration by the operator when actuating the valves in a targeted manner in order to flush through only those strings where contamination is to be feared on account of insufficient usage. In the case of said preferred development, the replacement of possibly contaminated water from the drinking or service water system can be effected with careful use of the water.

To be preferred in particular is the further development of the invention where flow sensors and/or temperature sensors are provided on the drinking or service water unit, the measured values of which are processed in the central control unit for controlling the controllable valve or valves. Thus, a flow meter and/or temperature sensor can be provided, for example, on the end of each individual string, by means of which flow meter and/or temperature sensor, for example, the state of the actual extraction via the last ring pipe in the direction of flow and/or of the water temperature can be ascertained. Should said extraction be at an insufficient level, the central control will open the controllable valve assigned to said string for flushing. Possible temperature sensors can vary the cycles of flushing operations. Said temperature sensors can shorten flushing intervals when temperatures are high, for example in wellness areas or in the summer months. The temperature sensors can determine current measured temperature values in the region of the drinking or service water system and compare them with given valves for supercritical temperatures. In the case of very cold temperatures, a flush through can be dispensed with for a longer time as a result of corresponding signals from the temperature sensors.

According to a preferred further development, for the ring pipes connected hereto in each case, each string comprises a connection fitting which is realized in the manner of a throttle and which comprises the mouth for the associated ring pipe. As a result of the connection fitting with throttle function, the pipe pressure in the region of the mouth of the ring pipe is reduced, as a result of which the flushing flow is brought about in the associated ring pipe with flow in the string. The connection fitting with throttle for the mouth of the ring pipe is preferably realized integrally with a further pipe portion which realizes the branch of the respective ring pipe from the string. The string then has an integral fitting to each ring pipe which is arranged on said string and which realizes a branch and a mouth for the associated ring pipe. The installation costs for realizing the drinking or service water system according to the invention can be reduced as a result of said development.

The above-mentioned fitting which realizes the branch and the mouth is realized as a standardized ring pipe flushing fitting. Independently of the concrete development of the branch and the mouth, the branch and the mouth of a single ring pipe are preferably at a spacing of less than 0.3 m in the direction of extension of the string.

For practical reasons, it is to be preferred when full flow shut-off valves are provided in each case between the branch and the mouth of a single ring pipe on the string and the associated ring pipe. Said shut-off valves should preferably be free of dead space. Over and above this, it is to be preferred when the shut-off valves are realized with a relatively small pressure difference. According to the concept underlying the invention for generating a flushing flow in the respective ring pipe, this is brought about solely by the pressure difference which is produced in the string on account of the flow. A forced flow as a result of a pump installed in the drinking or service water system for flushing through the individual ring pipes or the string should be dispensed with, and thus it is to be preferred when the full flow shut-off valve is realized as a ball valve, and preferably has a flow diameter which corresponds approximately to the flow diameter of the ring pipe. The low pressure loss, generated by the full flow shut-off valves, through the valves allows for a relatively high level of through-flow even when the pressure difference between the branch and the mouth of the respective ring pipe is low.

According to a further preferred development of the drinking or service water system according to the invention, said drinking or service water system has a circulation pipe which connects the end of the last string in the direction of flow to the start of the first string in the direction of flow. As a result of said circulation pipe, it is possible to set up a circulation inside the water system, on account of a pump which is installed in the circulation pipe. In addition, said circulation pipe has a water treatment unit which can be formed, for example, by a biological elimination unit in which germs in the drinking water are killed off. This further development may be essential to the invention per se and makes it possible, as a result of circulating water through the water cleaning system, for possibly contaminated water from the ring pipes also to be treated in an intensive manner inside the water system. Chemicals or the like, which circulate repeatedly in the drinking or service water system for cleaning and decontaminating said system, can be added, for example, in the cleaning unit before the treated cleaning water is removed via the wastewater drainage network.

For achieving the method-related aspect of the present invention, a method is proposed for operating a service water or wastewater system having at least one storey string or riser pipe string as well as several ring pipes, which are arranged one behind another in the direction of extension of the string, lead in each case to at least one consumer, branch off from the string and open out into the string at a location behind this in the direction of flow of the string. To replace stagnant water from the drinking or service water system, it is proposed with the method according to the present invention to generate a pressure difference, by means of which a flushing flow is generated in the associated ring pipe, as a result of opening a controllable valve, which is provided on the end of the string, between the branch and the mouth of each ring pipe of the string. The used water, in this connection, is preferably output at an output point connected downstream of the controllable valve to the public wastewater drainage network.

Further advantages and details of the present invention are produced from the following description and some exemplary embodiments in conjunction with the drawing, in which:

Fig. 1 shows a schematic view of a first exemplary embodiment of a drinking or service water system;

Fig. 2 shows a view of a detail of a wet cell shown in Fig. 1;

Fig. 3 a schematic representation of a second exemplary embodiment of a drinking or service water system:

Fig. 4 shows a schematic representation of a third exemplary embodiment;

Fig. 5 shows a schematic representation of a fourth exemplary embodiment;

Fig. 6 shows a schematic representation of a fifth exemplary embodiment and

Fig. 7 shows a schematic representation of an exemplary embodiment of a ring pipe flushing fitting which is to be installed in the string.

The exemplary embodiment shown in Fig. 1 and 2 illustrates a drinking or service water installation by way of the example of a hotel or a hospital. A cold water string 2 runs along a schematically shown storey and a hot water pipe 4 and a hot water circulation pipe 6 are provided parallel to this. The hot water circulation pipe leads to each individual wet cell 8 in a manner that is not shown in any detail, but is generally known. Each wet cell 8 comprises over and above this a ring pipe 10 for cold water which is connected in each case to the cold water string 2. Each ring pipe 10 comprises several consumers 12 which in the case of the exemplary embodiments in Fig. 1 and 2 are characterized schematically by a dot.

The consumers can be a toilet 12a, a shower 12b, a bath tub 12c or a hand washbasin 12d. The extraction points 12a-d are connected in series in the ring pipe 10. The ring pipe 10 branches off from the cold water string 2 by means of a branch 14 and opens out into said string 2 via a mouth 16. The branch 14 of each individual ring pipe is connected upstream of the mouth 16 in the direction of flow (arrow S marked in the cold water string 2). Ball valves as full flow shut-off valves 18a, 18b are provided in the ring pipe 10 and are accessible from the corridor or from the respective wet cell 8, by means of which ball valves it is possible to block off the ring pipe 10 connected thereto from the cold water string 2 in order, for example, to carry out installation work on the corresponding ring pipe 10. The shut-off valves 20a, 20b for the hot water pipe 4 and the hot water circulation pipe 6 for the respective wet cell are also situated in the same location. The valves 18, 20 are valves which are free of dead spaces and meet the legal requirements which are demanded of valves which are installed in drinking and service water systems. In the case of the exemplary embodiment shown, the valves correspond to European Standard EN 13828 and Certification Guidelines to DVGW Worksheet W 570. The valves 18, 20 are provided as concealed valves.

Figure 3 shows the cold water pipes of a drinking water system in a multi-storey building, for example a hospital. In each individual storey, water pipes can be laid according to the representations in Fig. 1 and 2. The cold water pipe system shown in Fig. 3 has a delivery point 22 from the public drinking water supply network, a riser pipe 24 which extends in the vertical direction and from which a horizontally extending storey string 2 branches off in each storey, a connecting pipe 26 which extends vertically, is connected to the individual storey strings 2 in each case with the interposition of a controllable valve 28 and leads via an equally controllable flushing valve 30 to an output point 32 for used water to the public wastewater drainage network. The individual cold water storey strings 2 extend one above another in the horizontal direction. One string 2 is provided in each storey. In the case of the second exemplary embodiment of the present invention shown in Fig. 3, each string 2 comprises six ring pipes 10 which branch off from the individual strings 2 via branches 14 and mouths 16 and open out into the said strings.

In the case of the third exemplary embodiment shown in Fig. 4, several riser pipe strings 2.1 to 2.4 are provided laid in the vertical direction. Shut-off valves 33, which are provided between the individual strings 2.1 to 2.3 and a horizontal distribution pipe, are situated on the front end of the respective strings 2 in the direction of flow. The individual riser pipe strings 2.1 to 2.4, in the case of the exemplary embodiment shown, pass through four storeys which are located one above another. For reasons of simplified representation, just one single wet cell 8 is schematically shown. In the top storey, all of the ring pipes 10 are schematically reproduced. The wet cells which are located beneath them with the associated ring pipes are not shown. The corresponding development is indicated purely by the mouth 16 which is provided on the storey. The controllable valves 28 are situated on the end of the three left-hand strings 2.1 to 2.3. Said valves 28 are provided between the individual strings 2.1 to 2.3 and a cross pipe 36, the end of which remote from the flow is connected to the last string 2.4 which guides a flow which descends in the vertical direction and on its end comprises the flushing valve 30 which leads to the output point.

Horizontally laid parallel storey strings 2 which are looped are provided in the case of the fourth exemplary embodiment of the present invention shown in Fig. 5. A riser pipe 35, which leads to the next storey string 2 and is connected to the front end, in the direction of flow, of the storey string 2 located above it, is correspondingly situated on the end of each string 2. The string 2.4 of the uppermost storey opens out in a wastewater pipe 26 which is provided with a flushing valve 30 which leads to the output point 32 for used water. In the case of the exemplary embodiment shown in Fig. 5, said flushing valve 30 is situated in a basement. However, it can be provided at an arbitrary point behind the last ring pipe 10 of the uppermost string 2.4.

In the case of the exemplary embodiment shown in Fig. 6, a cold water circuit system with two parallel riser pipe strings 2 is shown. Each individual riser pipe string 2 supplies two oppositely situated wet cells 8 with cold water per storey. The rear end, in the direction of flow, of the first string 2.1, on the left-hand side in Fig. 6, is connected to the front end, in the direction of flow, of the second string 2.2 on the right-hand side by means of a cross pipe 36. The second riser pipe string 2.2 opens out, however, in a controllable flushing valve 30 which leads to an output point 32 for used water to the drainage system. However, a T-piece, which leads to a circulation pipe 38 which includes a pump 40 and a biological elimination unit 42 and is connected by means of a further T-piece to the front end, in the direction of flow, of the first riser pipe string 2.1, is provided in front of the connection to said flushing valve 30. The circulation pipe 38 can be closed by means of, for example, controllable adjusting valves. The cold water treated in the exemplary embodiment shown in Fig. 6 is usually guided from the delivery point 22 via the first riser pipe string 2.1, the cross pipe 36 and by the second riser pipe string 2.2. Where the flow through is insufficient, the flushing valve 30 can be opened and cold water which is possibly standing in the pipe system can be output to the wastewater system. In the case of severe contamination, it is possible by actuating the pump 40 to guide the water standing per se in the pipe system through the biological elimination unit 42 and to treat it there. The treated water can then be returned into the system, preferably however via the wastewater network after opening the flushing valve 30.

Figure 7 shows in a schematic manner the connection between each ring pipe 10 shown schematically in the preceding exemplary embodiments and the associated string 2. The branch 14 and the mouth 16 are provided on a standardized ring pipe flushing fitting 44 which is realized as a branch and connection fitting. In a front region, in the direction of flow, of the ring pipe flushing fitting 44, a branch connection piece 46 branches off from the ring pipe flushing fitting 44 transversely to the direction of extension of the string 2. Said branch connecting piece 46 is connected to the ring pipe 10. The rear end of the ring pipe 10, in the direction of flow, is connected to a return connection piece 48 which also extends transversely to the extension of the string 2. Said return connection piece 48 opens out in the narrowed cross section of a throttle 50 which is provided on the rear region, in the direction of flow, of the ring pipe flushing fitting 44, or directly thereafter. The branch connection piece 46 and the return connection piece 48 are spaced apart from one another by less than 30 cm. The throttle 50 is designed in such a manner that a pressure difference of between approximately 20 and 50 mbar is set between the branch 14 and the mouth 16 when, for example, the valve 28, which is provided on the respective end of the corresponding string 2, is actuated for flushing the string or an extraction point connected downstream. Said pressure difference is sufficient to generate a circulating flushing flow inside the respective ring pipe 10. A speed of flow S in the string of approximately 1.5 m/second is accepted as a benchmark. The mouth 16, the branch 14 and the throttle 50 are designed in such a manner that from the flow S in the string approximately 10%, as ring pipe flow R, flushes the respective ring pipe 10, whereas approximately 90% as main flow H continues the string flushing in a straight line and is throttled in the throttle 50.

To avoid contamination of the exemplary embodiment shown in Fig. 3, the individual valve 28 can be actuated, for example, by a central control means. The valves 28.1 to 28.4 are usually in each case initially opened and closed per se in order to flush the respective ring pipes in the strings 2.1 to 2.4 in the respective regions one after another. The flushing valve 30 remains open during such a procedure such that possibly contaminated water is able to be removed out of the individual strings 2.1 to 2.4 directly into the wastewater system. Insofar as a sufficient hydraulic adjustment between the individual strings 2.1 to 2.4 is provided, the individual valves 28 can also be omitted where applicable and a flushing through of all of the strings 2.1 to 2.4 made possible just by opening the flushing valve 30. The knowledge underlying the exemplary embodiment shown in Fig. 3, however, is that a reliable flushing through can be ensured for each individual region purely as a result of blocking and opening the individual strings 2.1 to 2.4 in an effective manner.

In the case of the exemplary embodiment shown in Fig. 4, the individual vertical riser pipe strings can be flushed in the same manner. In the case of each flush, in all cases the right-hand riser pipe string 2.4, which leads to the output point 32, is traversed and consequently flushed through.

In the case of the exemplary embodiment shown in Fig. 5, just the flushing valve 30 has to be opened in order to flush through all of the looped storey strings and consequently to replace the cold water contained in the cold water system. The same applies to the exemplary embodiment shown in Fig. 6.

On account of the realization of the branch 14 and of the mouth 16 shown schematically in Fig. 7, each flushing of an individual string leads to at least one flushing flow inside the ring pipes 10 of the associated string 2. Over and above this, the design of the branch 14, mouth 16 and throttle 50 for each individual ring pipe 10 of the system is preferably effected in such a manner that a targeted extraction at an extraction point 12 which is arranged on a ring pipe connected downstream in the direction of flow, results in a flushing flow at the ring pipes 10 connected upstream in the direction of flow. If, for example, in the case of the exemplary embodiment shown in Fig. 5, an extraction point in the top storey on the last ring pipe 10 in the flow direction is used, this leads to a flow inside the entire water system as the individual strings 2.1 to 2.4 are looped. The water extraction at a hand washbasin, the flushing of a toilet, shower or bath regularly results in a flow and consequently, between each branch and each mouth of an individual ring pipe, which is connected upstream of the named last ring pipe in the flow direction, in a pressure difference which brings about water replacement in the respective ring pipe. The same applies, for example, in the case of the exemplary embodiment shown in Fig. 3 when an extraction point 12, which is connected in each case to the right-hand ring pipe 10, is actuated for the two ring pipes 10 of the string 2.1 connected in front of it in the direction of flow.

The third exemplary embodiment of the invention shown in Fig. 4 behaves in principle in the same way. If this is a hotel, for example, where just the top storey is occupied, a flushing through of the ring pipes 10, arranged in each case underneath the rooms, of the rooms located below them can be achieved at all events as a result of intermittent occupancy of all the rooms in the uppermost storey.

In the exemplary embodiment shown in Fig. 7, the throttle is realized as a nozzle with fixedly predetermined nozzle cross sections and transitions. As an alternative to this and for better adaptation of the flow resistances inside a string or in different strings 2 which are laid side by side or one above another, it can be preferred to realize the throttle in an adjustable manner. The adjustment of the throttle should preferably be effected, in this connection, in an automated manner. Such a controllable throttle should preferably be connected to the central control unit. Using such controllable throttles, it is possible to achieve, for example, a hydraulic adjustment between individual ring pipes 10 or individual strings 2.

It should also be emphasized that the return pipe flushing fitting 44 shown schematically in the exemplary embodiments can additionally also include the full flow shut-off valves in order to keep the installation costs as low as possible when realizing the drinking or service water system. The realization of such a standardized fitting reduces installation costs quite considerably as the string or the associated ring pipe only has to be connected to the fitting at four points.

The present invention additionally relates to a method for operating a drinking or service water system with at least one storey string or riser pipe string 2 as well as several ring pipes 10, which are arranged one behind another in the direction of extension of the string 2, lead in each case to at least one extraction point 12, branch off from the string and open out into the string at a location behind this in the direction of flow of the string. According to the invention, when removing drinking or service water at an extraction point 12 which is connected to the string, a pressure difference is generated as a result of a flow in the string between the branch 14 and the mouth 16 of the ring pipe(s) 10 of the string which is connected upstream of the consumer 12 in the direction of flow, by means of which pressure difference a flushing flow is generated in the ring pipe or pipes 10 connected upstream. The driving force for each flow through the drinking or service water system, in this case, is preferably solely the overpressure which bears against the delivery point from the public drinking or service water supply network. In the case of the method according to the invention, a pump for circulating the drinking or service water in the system is omitted.

List of references 2 Cold water string 4 Hot water string 6 Hot water circulation pipe 8 Wet cell 10 Ring pipe 12 Extraction point 12a Toilet 12b Shower 12c Bath tub 12d Hand washbasin 14 Branch 16 Mouth 18a Full flow shut-off valve 18b Full flow shut-off valve 20a Shut-off valve 20b Shut-off valve 22 Delivery point 24 Riser pipe 26 Connecting pipe 28 Valve 30 Flushing valve 32 Output point 33 Shut-off valve 35 Riser pipe 36 Cross pipe 38 Circulation pipe 40 Pump 42 Biological elimination unit 44 Ring pipe flushing fitting 46 Branch connection piece 48 Return connection piece 50 Throttle

Claims

1. Drinking or drinking water system with a surrender site (22) from a public drinking water supply network and at least one floor or two, respectively. riser string (2) having several wet cells (8) arranged one after the other in the direction of extension of the string (2), each exhibiting at least one take-off point (12) and at least one controllable valve (28, 30) connecting the drinking water system or the drinking water system with a discharge point (32) for used water for the public wastewater wastewater network, characterized in that ring wires (10) are connected to the wet cells (8), the wiring (10) exiting the string (2) and ending in the flow direction of the string (2) in the string (2) behind, and the at least one controllable valve (28, 30) is arranged such that in the opened state of the valve (28, 30) a current is produced in the string (2) and the associated annular cables (10) causing a rinsing flow.

A drinking or drinking water system according to claim 1, wherein the annulus (10) and / or a branch (14) respectively. an orifice (16) of the respective annulus (10) in the string (2) is formed such that upon withdrawal of drinking or drinking water at a withdrawal point (12) connected to the string with a current in the string between the branch (14) and the mouth (16) of the ring conduits (10) in the strand which is upstream of the consumer in flow direction produces a pressure difference, which produces a rinsing flow in the upstream ring conduit (s) (10) and the difference between the pressure at the point of delivery (22) and the point of discharge (32), respectively. the discharge point (12) generates a current in the drinking or drinking water system.

Drinking or drinking water system according to claim 1 or 2, characterized in that the controllable valve (28) is connected to a take-out point (12) connected to the annulus (10) provided in the end region of the string.

Drinking or drinking water system according to one of claims 1 to 3, characterized in that the controllable valve (28) is provided at the end of the string and connects the string (2) to a connecting line (26).

Drinking or drinking water system according to claim 4, characterized in that a plurality of strings (2) are provided, each provided with a controllable valve (28) in their end region of the string and connected to the connecting line (26).

Drinking or drinking water system according to claim 4 or 5, characterized in that the connecting line (26) flows in the flow direction behind the connection of the string respectively. all strings exhibit a controllable flushing valve (30) leading to the discharge point (32) of the public wastewater discharge network.

Drinking or drinking water system according to one of the preceding claims, characterized in that the controllable valve (28) is provided on the end of a plurality of loop-shaped strings (2).

Drinking or drinking water system according to one of the preceding claims, characterized in that the controllable valves are manufactured timed.

Drinking or drinking water system according to one of the preceding claims, characterized in that the controllable valve (s) (28, 30) can be controlled by a central control unit.

Drinking or drinking water system according to claim 9, characterized by flow and / or temperature sensors, whose measurement values are processed in the central control unit for controlling the control valve (s) (28).

Drinking or drinking water system according to claim 10, characterized in that the control unit generates a control signal by means of which the controllable valve is opened and held open so long as water which is in the string and connected ring pipes is diverted to the wastewater discharge network and replaced. with fresh water.

Drinking and drinking water system according to claim 10 or 11, characterized in that the control unit processes measured values from a flow sensor and, depending on the actual flow in the string, determines whether the control signal for opening the flush valve (30) is read out.

A method of operating a drinking or drinking water system according to any one of claims 1 to 12, with a surrender site (22) from a public drinking water supply network and at least one floor or two, respectively. riser string (2) and a spent water discharge point (32) for the public water wastewater network, at least one controllable valve (28) and a control unit for controlling the at least one controllable valve (28), wherein the controllable valve is arranged at a flow direction the rear end of the bar (2) and located upstream of the discharge site (32) in the flow direction, whereby the control unit generates a control signal by which the controllable valve (28) is opened and held open so long as water standing in the string (2) and connected ring wires (10), are diverted to the wastewater wastewater network and replaced with fresh water.

Method according to claim 13, characterized in that the control unit processes measured values from a flow sensor and, depending on the actual flow in the string, determines whether the control signal for opening the flush valve (30) is read out.