EP3957860B1 - Module compact pour une circulation d'eau - Google Patents

Module compact pour une circulation d'eau Download PDF

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Publication number
EP3957860B1
EP3957860B1 EP21186645.4A EP21186645A EP3957860B1 EP 3957860 B1 EP3957860 B1 EP 3957860B1 EP 21186645 A EP21186645 A EP 21186645A EP 3957860 B1 EP3957860 B1 EP 3957860B1
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EP
European Patent Office
Prior art keywords
drinking water
centrifugal pump
compact unit
unit
temperature
Prior art date
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Application number
EP21186645.4A
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German (de)
English (en)
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EP3957860A1 (fr
Inventor
Daniel BÜNING
Dr. Martin Oettmeier
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Wilo SE
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Wilo SE
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Publication of EP3957860A1 publication Critical patent/EP3957860A1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0066—Control, e.g. regulation, of pumps, pumping installations or systems by changing the speed, e.g. of the driving engine
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B7/00—Water main or service pipe systems
    • E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons or valves, in the pipe systems
    • E03B7/08—Arrangement of draining devices, e.g. manual shut-off valves

Definitions

  • the invention relates to a compact structural unit for water circulation in a drinking water supply network, which comprises at least one circuit and at least one consumer fed with drinking water therefrom, having an input for receiving drinking water from the circuit, an output for conveying drinking water into the circuit and an between Centrifugal pump unit arranged inlet and outlet.
  • Drinking water supply networks in buildings serve to supply consumers with cold or warm drinking water through taps such as taps, toilets or showers.
  • taps such as taps, toilets or showers.
  • the proliferation of germs in drinking water must be prevented.
  • water is withdrawn more or less regularly, and possibly rarely.
  • the result of irregular water withdrawal is stagnation of water in the supply pipes to the consumers, which in turn promotes contamination with bacteria and viruses. This is particularly a problem with large drinking water networks such as hospitals, hotels and public buildings.
  • drinking water supply networks are implemented with circuits in which the drinking water is pumped up to the tapping points in the circuit.
  • the VDI DVGW 6023 guideline "Hygiene in drinking water installations" stipulates that a complete water exchange of the circulating drinking water takes place every 72 hours in order to replace unused drinking water in the circulation line with fresh, cold drinking water. The water exchange occurs by draining the water from the circulation pipe into a drain and no longer using it as drinking water.
  • the drinking water temperature for cold drinking water must be as cold as possible and a maximum of 25° C in order to prevent an unacceptable proliferation of germs.
  • a compact structural unit for water circulation in a drinking water supply network which comprises at least one circuit and at least one consumer fed with drinking water therefrom, the compact structural unit having an inlet for receiving drinking water from the circuit and an output for conveying drinking water into the circuit
  • Centrifugal pump unit arranged between the inlet and the outlet with a pump unit that pumps the water in the circuit, an electric motor driving it and pump electronics for controlling and regulating the electric motor, and a flushing valve for draining drinking water from the circuit, which is hydraulically connected between the inlet and is arranged at the output and can be triggered by the pump electronics.
  • the core of the invention is therefore to use an existing system component, in particular its intelligence and functionality, to comply with hygiene standards in the drinking water supply and thereby to provide a compact unit that is structurally simpler and can be manufactured more cheaply than comparable units According to the state of the art. There is therefore no need for higher-level central control electronics, which controls both the flushing valve and the centrifugal pump unit or its pump electronics.
  • flushing valve which is part of a flushing unit
  • the flushing valve is an integral part of the compact unit and therefore not As is usual in the prior art, is arranged externally and away from the centrifugal pumps or compact structural units used for circulation, so that the effort for assembling or setting up the structural unit on site is reduced.
  • the compact unit according to the invention can be used for both hot water and cold water circulation systems.
  • the compact structural unit is preferably intended for wall mounting.
  • This has the advantage that it does not take up any floor space and can be made significantly smaller and more compact than comparable structural units that are designed to be set up as intended, as there is no need for stable housings and substructures.
  • Wall mounting also has the advantage that it can be arranged at any height, in particular at a comfortable working height for operating the pump electronics. For this purpose, a standing compact unit would have to have a housing of the appropriate height that is essentially empty.
  • Another advantage of wall mounting is that the compact unit can be connected directly to the rigid pipes running along the walls.
  • the centrifugal pump unit can be attached to a mounting base that is intended for wall mounting. It is also possible to attach further components of the compact unit to the mounting base.
  • the pump unit, the electric motor and the pump electronics form a structural unit, with the pump electronics preferably being attached to the outside of the electric motor, in particular to an axial end face.
  • Such centrifugal pump units are generally known.
  • the centrifugal pump unit according to the invention is specifically designed for use in a drinking water circulation system. The structural unification of all centrifugal pump components reduces the effort required to produce the compact unit.
  • the pump electronics can be spatially independent of the electric motor, in particular in the area detached from the electric motor
  • the pump electronics are intended to control or energize the electric motor and to control or regulate the electric motor and the pump unit.
  • the pump electronics have a frequency converter and operating software that carries out this control or regulation.
  • the pump electronics is additionally equipped with a software component and a switching output that can be controlled by it and to which the flushing valve is connected for control purposes.
  • the pump electronics can include a display and operating unit. This can have a display for displaying information and at least one control element for making entries.
  • the control element can be a rotatable and/or pushable button. Alternatively, it can be a touch-sensitive surface of the display, with additional controls possibly being available.
  • the display is advantageously a graphic color display.
  • the display and operating unit can serve different purposes. For example, it can be set up to accept a manual input of a trigger command for the flushing valve.
  • the display and operating unit can also be used in a classic manner to configure the centrifugal pump unit, in the present case in particular to configure water circulation. For example, a specific type of control and/or specific values of parameters or limit values can be set.
  • the display and operating unit can be used to display information about the drinking water supply network, such as the water temperature or the volume flow of the circulating drinking water.
  • errors or error states can be displayed on the display and operating unit. Since the display and operating unit is part of the Centrifugal pump unit, all of the above options are carried out directly on the centrifugal pump unit.
  • the compact unit can have a housing that at least partially covers the centrifugal pump unit and the flushing valve, in particular the flushing unit, together.
  • the inlet and the outlet preferably protrude from the side of the housing, in particular to the extent that the inlet valve and/or the outlet valve are accessible.
  • the pump electronics preferably protrude through an opening in a wall of the housing of the compact unit.
  • the pump electronics are therefore accessible without opening the compact unit, in particular for operation for setting purposes.
  • the flushing valve can be arranged between the centrifugal pump unit and the outlet. This has the advantage that the drinking water to be separated via the flushing valve and flowing out of the circuit flows through the centrifugal pump and can therefore be monitored or measured by the centrifugal pump in various ways.
  • the function of the flushing valve can be monitored in this way. If the pump unit has triggered the flushing valve and water, in particular an expected amount of water per time, flows through the centrifugal pump unit, the flushing valve is actually open and functional. However, if no water or less than the expected amount of water flows through the centrifugal pump unit per time, the flushing valve is not or not fully open and is therefore defective.
  • the pump electronics can be set up to monitor the function of the flushing valve. For this purpose, it can be set up, for example, to check after the flushing valve has been triggered whether the speed of the pump impeller is greater than zero despite the electric motor being switched off.
  • the volume flow can be determined, for example by measurement or calculation from pump sizes. Are the volume flow or speed the same? zero, the pump electronics can be set up to indicate or output an error or a warning message
  • the flushing valve can be arranged between the inlet and the centrifugal pump unit. This has the advantage that the drinking water to be separated via the flushing valve does not flow through the centrifugal pump and the centrifugal pump is therefore not overflowed when the flushing valve is open, i.e. the impeller of the centrifugal pump is not driven by the drained water flowing in from the circuit and neither is the electric motor runs as a generator, which requires special measures to prevent the frequency converter of the pump electronics from being overloaded.
  • the compact unit can have a backflow preventer between the flushing valve and the outlet.
  • the aforementioned alternative embodiment variant has the advantage that the centrifugal pump unit can be used to monitor the backflow preventer, more precisely to check its correct function. If water flows through the centrifugal pump unit when the flushing valve is triggered, the backflow preventer is defective.
  • the pump electronics can be set up to monitor the function of the backflow preventer. For this purpose, it can be set up, for example, to check after the flushing valve has been triggered whether the speed of the pump impeller is greater than zero despite the electric motor being switched off.
  • the volume flow can be determined, e.g. by measurement or calculation from pump sizes. If the volume flow or the speed is greater than zero, the pump electronics can be set up to indicate or output an error or a warning message.
  • the flushing valve can be, for example, a solenoid valve.
  • the flushing unit can have an outlet with a siphon that is open to the atmosphere. This outlet, which is open to the atmosphere, prevents one Re-germination from the direction of the outlet. If necessary, the outlet and the siphon can also be integrated in the compact unit, in such a way that these components of the flushing unit are enclosed by a housing of the compact unit.
  • the flushing unit has a water detecting sensor in a portion of the flushing unit, in particular in the siphon, which is connected to the pump electronics via a corresponding interface.
  • the sensor can be a level sensor. This allows the pump electronics to monitor whether water in the siphon, possibly as a result of a blockage in the drain line, exceeds a certain limit level and the siphon is in danger of overflowing.
  • the pump electronics can be set up to close the flushing valve in the event of detected water or a water level that is too high so that the flushing unit does not overflow.
  • the compact unit has a preferably manually operable inlet valve in the direction of flow behind the inlet of the compact unit. More specifically, the inlet valve can be between the inlet and the centrifugal pump unit or between the inlet and the flushing valve. Additionally or alternatively, the compact unit can have a preferably manually operable output valve in the direction of flow in front of the outlet of the compact unit. More specifically, the output valve can be between the flushing valve and the output, or between the backflow preventer and the output, or between the centrifugal pump unit and the output.
  • the inlet and outlet valves are service valves that can be closed to dismantle a component of the compact unit so that drinking water does not flow from the circuit into the compact unit in the event of service.
  • the compact unit can have a central multi-way pipe section that has an input connection and at least two output connections.
  • the input connection is hydraulically connected to the input of the compact unit. This can be done directly or indirectly via the Centrifugal pump unit.
  • the flushing valve is connected to a first of the two output connections.
  • the second of the two output connections is connected to the output of the compact unit. In one embodiment, this can also be done directly, in another embodiment, indirectly, either via the backflow preventer, or via the centrifugal pump unit, or via the backflow preventer and the centrifugal pump unit.
  • the multi-way pipe section forms a core piece and is spatially arranged in a central area of the compact structural unit in order to obtain a particularly compact design.
  • the centrifugal pump unit is arranged spatially above the flushing unit and the output is directed to the side in relation to this arrangement.
  • another module such as a drinking water filter or cooling unit (chiller) can be arranged laterally next to the compact unit and connected to its output.
  • the output is suitably arranged laterally in the middle of the compact unit.
  • This has the advantage that an additional unit connected to the output, such as a chiller, can be mounted either in a normal orientation related to up and down or in an upside down orientation without having to make any structural changes.
  • the compact unit can have a sampling valve. This makes it possible to take a water sample to examine the water quality directly on the compact unit.
  • the central multi-way pipe section is cross-shaped, ie a four-way pipe section. So it can have a third output connection. This has the advantage that the sampling valve can be connected to the third output connection. This means there is no need for an additional 3-way Pipe section can be used to integrate the sampling valve into the piping in the compact unit.
  • the centrifugal pump unit preferably has an integrated temperature sensor for determining the temperature of the drinking water flowing through the centrifugal pump unit. This means that no separate temperature sensor needs to be provided and installed, since the centrifugal pump unit itself forms a temperature sensor.
  • the temperature of the circulating drinking water can be determined by direct measurement or indirectly by measuring another quantity such as the motor winding temperature.
  • the pump electronics can have at least one communication interface in order to connect the centrifugal pump unit and consequently the compact unit, for example, to a local or global data network such as an intranet, Internet or building automation and to remotely operate and/or query it via it.
  • the pump electronics can be set up to receive and execute a remote triggering of the flushing valve.
  • the flushing valve can be controlled and triggered via the Internet or building automation.
  • This communication interface can be, for example, a web interface or an industrial bus interface such as Modbus or Bacnet.
  • the communication interface can be wired or a radio interface, such as a Bluetooth, NFC, RFID or WLAN interface, etc.
  • a radio interface has the advantage that the centrifugal pump unit or the compact unit can be connected wirelessly to a portable external device such as a smartphone , laptop or tablet connected and can also be operated or queried.
  • the communication interface is usually a combination of hardware and software in order to provide, on the one hand, the necessary data communication and, on the other hand, the necessary data processing, in particular protocols.
  • the pump electronics can also have at least one interface for optionally connecting another sensor.
  • a further sensor can be, for example, a temperature sensor, a volume flow sensor or a differential pressure sensor. This makes it possible, for example, to monitor an expansion module connected to the compact unit, e.g. in the case of a cooling unit, its output temperature or, in the case of a filter, the differential pressure across the filter. Furthermore, not only monitoring via the interface for the additional sensor, but also a suitable measure can be taken in response to the sensor signal from the pump electronics. Furthermore, the sensor signal can be queryable via the communication interface, in particular the web interface.
  • the further sensor can be arranged externally to the centrifugal pump unit. It can also be arranged externally to or internally in the compact unit.
  • the pump electronics can be set up to issue a warning message, for example via the display or the communication interface, when the measured value of the additional sensor (a temperature or a differential pressure) reaches or exceeds a limit value.
  • the additional sensor a temperature or a differential pressure
  • it can change the operating point of the pump unit, in particular the volume flow delivered, depending on the sensor signal.
  • the further sensor can also be arranged at any other point in the drinking water supply network, preferably near a consumer, and detect a temperature, a pressure or a volume flow there. This can be helpful, for example, for hydraulic balancing.
  • an expansion module can be connected to the output.
  • This can be, for example, a cooling unit for cooling or a filter for filtering the drinking water before it is pumped into the circuit.
  • the mounting base preferably has a mechanical interface for the lateral connection of the expansion module. This means that the expansion module can be aligned with the compact unit. At the same time, the mechanical interface forms a holder for the expansion module.
  • the pump electronics can have a switching output for connecting a UV lamp.
  • a UV lamp is used to kill germs and can also be part of the compact unit or arranged externally to it.
  • the switching output can be switched by the pump electronics and can be potential-free, for example forming a relay output, or used to supply the UV lamp with power that can be switched on and off.
  • the pump electronics are preferably set up to optionally carry out at least one of the following types of control of the centrifugal pump unit, a temperature control to keep the drinking water temperature constant, a volume flow control to keep the volume flow in the circuit constant and / or a pressure control to keep constant or proportional control of the pressure difference across the circuit.
  • the temperature control is preferably carried out depending on the pump's internal temperature sensor, alternatively depending on the external temperature sensor.
  • the pump electronics adjusts the speed of the pump unit depending on the temperature, for example in such a way that the higher the temperature, the higher the speed is set.
  • the volume flow and pressure control is carried out depending on the volume flow currently delivered by the centrifugal pump unit and/or the differential pressure built up by it, which is determined by the pump electronics, either by sensors or by calculation.
  • the pump electronics have a non-volatile memory and are set up to document information about the drinking water supply network, in particular the temperature of the drinking water pumped, the tapping activity of the consumers and/or error states, in the memory. This means you can always go back to the past it must be checked whether the drinking water supply network meets certain hygiene requirements.
  • the centrifugal pump unit and its pump electronics form the brain for controlling the flushing valve and monitoring the drinking water supply network.
  • the centrifugal pump unit not only acts as an actuator, but also as a sensor. It can also monitor an optional expansion module.
  • the temperature of the pumped drinking water can be recorded by the pump electronics via the pump's internal temperature sensor or via the external temperature sensor.
  • the limit value can be, for example, 25°C.
  • the tapping activity in the network can be determined by the pump electronics via the operating point of the centrifugal pump unit, as the operating point changes when water is withdrawn from the circuit via one of the consumers.
  • the operating point can be defined, for example, by the volume flow and the differential pressure or the electrical power consumption of the electric motor and the volume flow. If water is not taken from any of the consumers, the operating point of the centrifugal pump unit does not change.
  • the flushing valve can be triggered if this is the case for a period of, for example, 72 hours.
  • the flushing valve is triggered or the drinking water is separated purely in a time-controlled manner, for example every 72 hours.
  • This condition may be independent of the other conditions in any case applied to ensure a complete replacement of the circulating water, which may not occur through a tapping activity alone, and which may not occur with a purely temperature-controlled release in summer because the drinking water is already supplied by the water supplier at a temperature of 16°C or more enters the drinking water supply network.
  • the third condition therefore represents a fallback option.
  • the limit value, the time period and/or the interval can be a parameter that can be specified in the pump electronics.
  • the flushing valve While the flushing valve is open, the drinking water is drained from the circuit and fresh, especially colder drinking water flows into the circuit, which after a certain time also reaches the compact unit or its centrifugal pump unit.
  • the pump electronics can recognize this point in time because the temperature of the pumped water drops to the temperature of the water supplier.
  • the target temperature value can be 20°C.
  • the second condition mentioned makes sense, according to which the flush valve is switched off when the temperature of the drinking water no longer changes, i.e. to a minimum value has fallen.
  • the flushing can be switched off when a predetermined amount of drinking water or drinking water has been drained for a certain period of time.
  • This amount preferably in [m 3 ], corresponds suitably the volume in the circuit and the period of time required to drain this quantity at a certain volume flow.
  • the target value, the quantity and/or the period can be a parameter that can be specified in the pump electronics. This takes into account the fact that the pump electronics cannot know at the factory how large the drinking water supply network is in which the compact unit is installed.
  • the pump electronics can be set up to independently determine the amount of drinking water to be drained or the period of time for draining, for example by measuring the time or the amount of water flowing through the centrifugal pump during a first flush until the temperature has dropped to the minimum value.
  • FIG. 1 illustrates an exemplary drinking water supply network 30 in a schematic representation.
  • the drinking water supply network 30 is supplied with fresh drinking water via a house connection 28 from a water supplier who supplies the drinking water at a specific temperature and a specific pressure.
  • a main line 29 connects the house connection 28 with a circuit 31 (circulation line), to which several consumers 32 are connected in the form of drinking water tapping points.
  • the tapping points here are, for example, a sink faucet, a bathtub faucet and a toilet.
  • the circuit consists of several supply and return lines.
  • the main line 29 first opens into a central feed line 33, from which a first, second and third local feed line 34 extends and connects the consumers 32 in the manner of a hydraulic series connection.
  • the local feed lines each merge into a local return line 35.
  • These local return lines 35 open into a common central return line 36 via a circulation valve 37 for hydraulic balancing of the local circuits 34, 35, which in turn flows into a circulation arrangement A with a centrifugal pump unit 2, which conveys the return water back into the main line 29 and thus again fed into circuit 31.
  • a circulation arrangement A with a centrifugal pump unit 2, which conveys the return water back into the main line 29 and thus again fed into circuit 31.
  • the circulation arrangement A is in Figure 1 presented as a black box, its implementation according to a variant Figure 2 shows.
  • the drinking water supply network 30 may have a different hydraulic structure in another variant.
  • the lines to the consumers can be pure branch lines, ie without a return line, with a water meter at the beginning of the respective branch line to one or more consumers.
  • FIG. 2 illustrates in a schematic representation an implementation of the circulation arrangement A by a compact unit 1 according to the invention.
  • the circulation arrangement A here comprises a section of the main line 29, the end of which flows into the circuit 31, which is shown here in simplified form by a single pipeline and at the end in turn into the circulation arrangement A occurs.
  • the compact unit 1 has an input 3 for receiving drinking water from the circuit 31 and an output 5 for conveying drinking water into the circuit 31, the output 5 being connected to the main line 29.
  • a centrifugal pump unit 2 with a pump unit 2a, an electric motor 2b driving it and pump electronics 2c for controlling and regulating the electric motor 2b.
  • a flushing valve 7a for draining drinking water from the circuit 31 is also arranged hydraulically between the inlet 3 and the outlet 5, whereby in this embodiment variant it is located between the centrifugal pump unit 2 and the outlet 5. More precisely, it lies between the centrifugal pump unit 2 and a backflow preventer 11, which prevents drinking water from flowing back from the main line 29 via the outlet 5 into the compact unit.
  • Another backflow preventer 11 is also arranged in the main line 29.
  • the line between the backflow preventer 11 of the compact unit 1 and the main line 29 is referred to below as the intermediate line 16.
  • a central element of the compact unit 1 is the multi-way pipe section 10, which in this embodiment variant has three connections and the flushing valve 7a via which the centrifugal pump unit 2 connects to the inlet 4 and via the backflow preventer to the outlet 5. If you look more closely, it connects the centrifugal pump unit 2, the flushing valve 7a and the backflow preventer 11 with each other.
  • a manually operable input valve 4 is arranged between the centrifugal pump unit s and the input 4 and can be shut off if necessary.
  • the centrifugal pump unit 2 has a display and operating unit 2d with a display 8, a control element 9, and a radio communication interface. Furthermore, the centrifugal pump unit 2 contains a temperature sensor 20 for detecting the temperature of the drinking water pumped, and a volume flow determination 22. The centrifugal pump unit 2 is therefore not only an actuator in the form of a pump, but also a sensor component within the compact unit 1.
  • the flushing valve 7a is a solenoid valve and is connected to the pump electronics 2c via a control line 13. In other words, the flushing valve 7a can be triggered by the pump electronics 2c.
  • the centrifugal pump unit 2 delivers the drinking water from the circuit 31 via the backflow preventer 11 and the intermediate line 16 to the main line 26 and thus back into the circuit 31.
  • fresh drinking water only then enters the circuit via the main line 29 31 flows in when water is removed from the circuit 31, for example by removing it from one of the consumers 32 or by draining water as a result of an opened flushing valve 7a.
  • the flushing valve 7a is opened so that the drinking water flows from the circuit 31 into a free outlet 7b with a siphon 7c.
  • the circuit 31 is thus largely emptied and filled with fresh drinking water.
  • FIG 3 shows a more detailed view of a compact unit 1 according to a first embodiment variant of the invention in a schematic representation.
  • the centrifugal pump unit 2 is located between the input 3 and the Multi-way pipe section 10.
  • the centrifugal pump unit 2 here also consists of the structural combination of a pump unit 2a, an electric motor 2b driving it and pump electronics 2c, which is attached to the electric motor 2b.
  • the pump electronics 2c has a communication interface with which the centrifugal pump unit 2 and thus the compact unit 1 is connected via a communication line 17 to a building automation system, a local network or the Internet (www).
  • the centrifugal pump unit 2 can be remotely controlled and/or queried remotely in this way.
  • the electric motor 2b is designed as a wet rotor, with its rotor rotating in a rotor chamber filled with the pumped drinking water.
  • Flow channels between the pump chamber containing the impeller and the rotor chamber ensure a continuous flow through the rotor chamber.
  • there is a filter 19 in front of the centrifugal pump unit 2 in the direction of flow which filters out coarse particles from the drinking water before they enter the pump unit 2a can enter.
  • the filter 19 lies between the inlet valve 4 and the pump unit 2a.
  • the multi-way pipe section 10 is cross-shaped here and thus has four connections 10a, 10b, 10c, 10d, between which there is a 90 ° angle, with the pump unit 2a being connected to an input connection 10a of the multi-way pipe section 10.
  • the flushing valve 7a is connected to an opposite first output connection 10b.
  • a second output connection 10c leads off to the right side, which is connected to the backflow preventer 11 and leads to the output 5 of the compact unit 1.
  • a manually operable output valve 6, analogous to the input valve 5, is arranged between the backflow preventer 11 and the output 5.
  • An intermediate line 16 connects the output 5 with the main line 29.
  • the multi-way pipe section 10 On the left side, the multi-way pipe section 10 has a third output connection 10d, on which a sampling valve 18 is arranged. This enables a drinking water sample to be taken for quality tests directly on the compact structural unit 1 according to the invention.
  • the flushing valve 7a is part of a flushing unit 7, which also includes a free outlet 7b, a siphon 7c and an optional level sensor 7e.
  • the flushing valve 7a is a solenoid valve and has an electromagnetic actuator 7d, which is connected to the pump electronics 2c via a control line 13.
  • the pump electronics 2c can trigger the flushing valve 7a via the control line 13, so that the drinking water in the circuit 31 pours into the free outlet 7b.
  • the free outlet 7b is open to the atmosphere in order to prevent germs from the drain or siphon 7c from entering the circuit 31.
  • the level sensor 7e monitors a possible blockage-related overflow of the flushing unit 7. It is also connected to the pump electronics 2 via a sensor line 14.
  • An expansion module 15 is connected to the output 5 of the compact unit 1, which can be, for example, a cooling unit or a filter.
  • a cooling unit In the case of a cooling unit, pipe connections can go up or down.
  • the output connection 5 of the compact structural unit 1 is arranged laterally in the middle.
  • the centrifugal pump unit 2 is intended to ensure that the drinking water circulates continuously in the circuit 31.
  • the centrifugal pump unit 2 can keep its volume flow or delivery head or differential pressure constant, in particular regulate it.
  • the drinking water enters the compact unit 1 via the inlet 3 and flows through the inlet valve 4 and through the filter 19 into the pump unit 2, which increases the pressure of the drinking water. Since the flushing valve 7 is closed, the drinking water flows from the inlet connection 10a to the second outlet connection 10c of the multi-way pipe section 10 and through the backflow preventer 11 and the outlet valve 6 to the outlet 5, from where it flows through the intermediate line 16 to the main line 29 and then again enters the circuit 31.
  • a tapping activity occurs when 32 drinking water is drawn from one of the consumers. In this case, the pressure in the drinking water supply network and the from Centrifugal pump unit 2 pumped volume flow and fresh drinking water flows from the house connection 28 via the main line 29 into the circuit 31.
  • centrifugal pump unit 2 has a volume flow or differential pressure determination in the form of a sensor or determines the volume flow or the differential pressure mathematically in a manner known per se.
  • the centrifugal pump unit 2 or its pump electronics 2c is set up to recognize and document every tapping activity on the consumers 32, in particular to store it in a memory, for example in the form of an event.
  • the centrifugal pump unit 2 is set up to trigger the flushing valve 7a if there has been no dispensing activity for a certain period of time or if there has been no change in the operating point. This period is preferably between 24 and 72 hours. If a tapping activity occurs, the centrifugal pump unit 2 begins to wait for the period again.
  • the centrifugal pump unit 2 can be set up in addition or as an alternative to the aforementioned tapping activity-dependent flushing criterion, the flushing valve 7a to be triggered after a certain period of time. This period is, for example, 72 hours.
  • the centrifugal pump unit 2 has an internal temperature sensor 20 with which the temperature of the pumped drinking water is determined. In addition, the centrifugal pump unit documents this temperature by measuring it above the saves time. Advantageously, it can also be determined and documented at which temperature the water supplier provides the drinking water at the domestic water connection 28 by documenting the lowest temperature at the end of a rinsing process (approach: the heating of the water during rinsing is negligible).
  • the drinking water in the circuit 31 can heat up, which accelerates the formation of germs and possibly reaches hygienically unacceptable temperatures.
  • This heating process is monitored by the centrifugal pump unit 2. It triggers the flushing valve 7a when the temperature of the drinking water being pumped reaches or exceeds a limit value, for example 25°C. Since it is possible that this limit value is exceeded at times, especially in the summer months, it also makes sense in this case if the temperature-dependent flushing criterion is overlaid with the time-dependent flushing criterion, so that flushing is carried out every 72 hours in any case.
  • the centrifugal pump unit 2 closes the flushing valve 7a when the level sensor 7e indicates that a limit level in the siphon 7c has been reached or exceeded in order to prevent overflow.
  • the centrifugal pump unit 2 can carry out a valve test in which the flushing valve 7a is triggered briefly, for example for a few seconds, in particular 3 seconds, preferably at midnight.
  • the flushing valve 7a As a result of the flushing valve 7a being triggered, it opens and the drinking water is separated into the free outlet 7b. Since this is open to the atmosphere, opening the flushing valve 7a essentially represents a hydraulic short circuit and the drinking water is separated at the pressure of the water supplier, approx. 2-6 bar, minus the pipe losses in the drinking water network and at maximum speed.
  • a flow reducer can be arranged in front of or behind the flushing valve 7a, which regulates a constant flow regardless of the pressure, for example 10 l/min. Since the drinking water to be separated in the embodiment variant according to Figure 3 flows through the centrifugal pump unit 2, drives the pump unit 2a acts like a turbine, so that the electric motor 2b works as a generator.
  • the electric motor is switched off or not energized for the time.
  • the centrifugal pump unit can monitor the separation or rinsing process. As a result of the monitoring, the centrifugal pump unit 2 can apply a switch-off criterion so that the amount of water to be separated to flush the circuit and thus the economic loss for the unused drinking water is minimal.
  • the centrifugal pump unit 2 waits for this point in time and switches off the flushing valve 7a when the temperature reaches or falls below a target value , e.g. 20°C. In addition, the centrifugal pump unit switches off the flushing valve 7a when the temperature no longer changes or no longer changes significantly, in other words it has reached a minimum value.
  • a target value e.g. 20°C
  • This temperature change-based switch-off criterion is superimposed on the previous temperature-based criterion and ensures that the flushing valve (7a) is switched off even if the temperature of the drinking water supplied by the water supplier is above the target value. The water consumption for rinsing is still minimal.
  • the flushing valve 7a can be switched off when a predetermined amount of drinking water in liters or cubic meters or drinking water for a certain period of time has been drained. These criteria can also be used either in addition to or as an alternative to the aforementioned criteria. Since the centrifugal pump unit 2 determines its currently pumped volume flow via the volume flow determination 22, it can function as a water meter by multiplying the volume flow by time from the moment the flushing valve is triggered. The centrifugal pump unit 2 switches off the flushing valve 7a when the predetermined amount of drinking water has flowed through it.
  • the target value, the quantity and/or the period is a parameter that can be specified in the pump electronics. This takes into account the fact that the pump electronics cannot know at the factory how large the drinking water supply network is in which the compact unit is installed. However, it is intended that the pump electronics be set up to independently determine the amount of drinking water to be drained or the period of time for draining. This is achieved by measuring the time or the amount of water flowing through the centrifugal pump during a first flush until the temperature has dropped to the minimum value. The amount of water then present or the time that has elapsed up to that point can then be saved as a parameter for a quantity-based or time-based switch-off criterion in the pump electronics 2c.
  • the centrifugal pump unit 2 can detect the hydraulic short circuit that occurs as a result of the opening of the flushing valve 7a by changing its operating point. From this, the centrifugal pump unit can recognize that the flushing valve 7a is functioning properly. If the electric motor is not powered during this time, the proper functioning of the flushing valve can be recognized by the fact that the pump speed is greater than zero because water flows through the pump unit 2a and drives its impeller. Conversely, this means that the centrifugal pump unit 2 can conclude that the flushing valve 7a is defective if, after the flushing valve 7a has been triggered, the expected operating point change or the positive pump speed is not present despite the engine being switched off. The centrifugal pump unit 2 then issues an error message, for example via the display 8 or the communication interface.
  • the further temperature sensor 21a in the flow direction behind the backflow preventer 11 enables the pump electronics 2c to recognize the state of the flushing valve 7a at any time. This is particularly useful if the flushing valve 7a does not trigger itself.
  • the pump electronics 2c evaluates the temperature measured by the further temperature sensor 21a by comparing it with the self-measured temperature. If the temperature measured by the further temperature sensor 21a remains constant while the temperature measured by the pump-internal temperature sensor 20 drops, the flushing valve 7a is obviously open and flushing is taking place (flushing operation). Are the However, if both temperatures are the same, circulation takes place (circulation operation).
  • the pump electronics 2c can even detect an error in the Recognize flushing valve 7a. If the temperatures remain the same after the flushing valve 7a is triggered, it is closed incorrectly. If the temperatures are different during circulation operation, water obviously flows out via the flushing valve 7a, ie it is opened incorrectly. In all cases, the status, in particular an error state of the flushing valve 7a, can be displayed by the pump electronics 2c on the display 8, reported via the communication interface and/or stored in the pump electronics 2c in a way that can be accessed remotely.
  • An external sensor 21b is arranged in the expansion module 15, which is also connected to the pump electronics 2c via a sensor line 14.
  • the pump electronics 2 is therefore able to monitor the expansion module 15 with regard to the measured variable recorded.
  • the expansion module 15 is a cooling unit
  • the external sensor 21b can be a temperature sensor that detects the temperature at the output of the cooling unit.
  • the centrifugal pump unit 2 can be set up to carry out temperature control based on this temperature. Alternatively or additionally, if a limit value is exceeded, an error or warning message can be generated by the centrifugal pump unit 2 and displayed on the display 8 or sent via the communication line 17 to indicate an error in the cooling unit.
  • the external sensor 21b can be a differential pressure sensor that detects the pressure drop across the filter and thus indicates its degree of contamination.
  • the centrifugal pump unit 2 can be set up to adapt its control based on this differential pressure, for example to increase the delivery head as the differential pressure increases in order to keep the speed of the circulating drinking water constant.
  • an error or warning message can be generated by the centrifugal pump unit 2 and shown on the display 8 or be sent via the communication line 17 to indicate maintenance or replacement of the filter.
  • FIG 4 shows another embodiment variant of a compact unit 1 according to the invention. It differs from the variant in Figure 3 in that the centrifugal pump unit 2 is not located in front of the flushing valve 7a in the direction of flow, but behind it, that is, it is not arranged on the inlet side but on the outlet side. In other words, the flushing valve 7a is not arranged between the centrifugal pump unit 2 and the outlet 5, but between the inlet 3 and the centrifugal pump unit 2.
  • This arrangement has the advantage that the centrifugal pump unit 2 does not overflow during flushing operation, ie it is driven like a turbine by the drinking water to be separated. Because the water rests in the intermediate line 16 during rinsing. There is therefore no risk of overloading the intermediate circuit of the frequency converter. Monitoring the rinsing process is only possible to a limited extent.
  • a further temperature sensor 21a must be used between the inlet and the flushing valve 7a. Furthermore, the centrifugal pump unit 2 cannot function as a water meter here.
  • An advantage of the arrangement in Figure 4 however, is that the proper functionality of the backflow preventer 11 can be checked. If the centrifugal pump unit 2 detects a flow during the flushing activity, for example a speed other than zero despite the electric motor 2b being de-energized, it is concluded that the backflow preventer 11 is defective. The centrifugal pump unit 2 then issues an error message, for example via the display 8 or the communication interface.
  • Figures 5 to 7 show constructive designs of variants of compact units according to the invention 1. How Figure 5 As can be seen, all components of the compact units 1 are arranged in a housing 1a. The input 3 protrudes at the top center and the output 5 protrudes from the housing 1a in the middle on the right in the form of a connecting piece. At the The siphon 7c is led out of the housing 1a in the middle of the bottom. An electrical supply line 12 for supplying the centrifugal pump unit 2 with electrical power is led into the housing 1a from below. In the housing 1a there is an opening through which the pump electronics 2c is accessible, in particular protrudes through. The pump electronics 2c has a display and operating unit 2d with a display 8 and a control element 9 in the form of a rotary-push button.
  • the housing 1a is removed, so that the view is clear of a mounting base 1b intended for wall mounting, to which the hydraulic components are mechanically attached via pipe clamps.
  • the version in Figure 6 has only an inlet valve 4 in the form of a manually operated shut-off valve, but no outlet valve 6.
  • the multi-way pipe section 10 only has three connections here and is T-shaped since no sampling valve 18 is provided.
  • the following components are in a line, viewed from top to bottom: input 3, input valve 4, centrifugal pump unit 2, multi-way pipe section 10 with its input connection 10a, the second output connection 10c on the right side and the first output connection 10b, flushing valve 10a, a pipeline, free outlet 7b and siphon 7c.
  • the backflow preventer 11 is connected to the second output connection 7c extending to the right, to which a pipe is connected, the end of which forms the output 5.
  • Figure 7 shows another embodiment variant with the housing 1a removed. It differs from the variant in Figure 6 essentially in that the outlet valve 6 and the sampling valve 18 are also present, so that the multi-way pipe section has four connections and is cross-shaped with identical angles between the connections. Inlet and outlet valves 4, 6 protrude beyond the mounting plate 1b so that they are accessible even when the housing is installed.
  • the mounting plate 1b has a slightly different shape and the supply line 12 is inserted into the compact unit 1 at the bottom right and is located next to the communication line 17.
  • the invention includes any changes, alterations or modifications to exemplary embodiments which involve the replacement, addition, alteration or omission of elements, components, method steps, values or information, as long as the basic idea according to the invention is retained, regardless of whether whether the change, variation or modifications results in an improvement or deterioration of an embodiment.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)

Claims (15)

  1. Unité compacte (1) de circulation d'eau dans un réseau d'alimentation en eau potable (30), comprenant au moins un circuit (31) alimentant au moins un consommateur (32) en eau potable, présentant
    - une entrée (3) pour recevoir l'eau potable du circuit (31),
    - une sortie (5) pour le refoulement de l'eau potable dans le circuit et
    - un groupe motopompe centrifuge (2) disposé entre l'entrée (3) et la sortie (5), avec un module de pompe (2a), un moteur électrique (2b) entraînant celui-ci et un circuit électronique de pompe (2c) pour la commande et la régulation du moteur électrique (2b),
    - une valve de rinçage (7a) pour évacuer l'eau potable du circuit (31) disposée hydrauliquement entre l'entrée (3) et la sortie (5), caractérisée en ce que la valve de rinçage (7a) peut être déclenchée par le circuit électronique de pompe.
  2. Unité compacte (1) selon la revendication 1, caractérisée en ce que le groupe motopompe centrifuge (2) est fixé sur une base de montage (1b) prévue de manière conforme pour le montage mural.
  3. Unité compacte (1) selon la revendication 1 ou 2, caractérisée en ce que la valve de rinçage (7a) est disposée entre le groupe motopompe centrifuge (2) et la sortie (5).
  4. Unité compacte (1) selon l'une des revendications précédentes, caractérisée en ce qu'un clapet antiretour (11) est disposé hydrauliquement entre la valve de rinçage (7a) et la sortie (5).
  5. Unité compacte (1) selon l'une des revendications précédentes, caractérisée par une section de tube centrale multivoie (10) comportant un raccord d'entrée (10a) et au moins deux raccords de sortie (10b, 10c), sachant que le raccord d'entrée (10a) est relié à l'entrée (3), notamment par l'intermédiaire du groupe motopompe centrifuge (2), que le premier des deux raccords de sortie (10b) est relié hydrauliquement à la valve de rinçage (7a) et que le second des deux raccords de sortie (10c) est relié hydrauliquement à la sortie (5), notamment par l'intermédiaire d'un clapet antiretour (11).
  6. Unité compacte (1) selon l'une des revendications précédentes, caractérisée en ce que l'entrée (3) est dirigée vers le haut, le groupe motopompe centrifuge (2) est disposé spatialement au-dessus de la valve de rinçage (7a) et la sortie (5) est dirigée vers le côté par rapport à cette disposition.
  7. Unité compacte (1) selon l'une des revendications précédentes, caractérisée en ce que le groupe motopompe centrifuge (2) présente une sonde de température intégrée (20) pour déterminer la température de l'eau potable circulant dans le groupe motopompe centrifuge (2).
  8. Unité compacte (1) selon l'une des revendications précédentes, caractérisée en ce que le groupe motopompe centrifuge (2) présente une unité d'affichage et de commande (2d) pour la saisie d'un ordre de déclenchement pour la valve de rinçage (7a) et/ou pour la configuration du groupe motopompe centrifuge (2) pour la circulation d'eau et/ou pour l'affichage d'informations sur le réseau d'alimentation en eau potable, en particulier des états d'erreur.
  9. Unité compacte (1) selon l'une des revendications précédentes, caractérisée en ce que le circuit électronique de pompe (2c) présente au moins une interface de communication, de préférence une interface web, pour le raccordement du groupe motopompe centrifuge (2) à une domotique ou pour la connexion à un réseau, en particulier le réseau Internet.
  10. Unité compacte (1) selon la revendication 9, caractérisée en ce que le circuit électronique de pompe (2c) fait saillie à travers une ouverture dans une paroi du boîtier (1a) de l'unité compacte (1).
  11. Unité compacte (1) selon l'une des revendications précédentes, caractérisée en ce qu'un module d'extension (15) est raccordé à la sortie (5), par exemple un groupe de refroidissement ou un filtre pour l'eau potable avant son transport dans le circuit (31).
  12. Unité compacte (1) selon l'une des revendications précédentes, caractérisée en ce que le circuit électronique de pompe (2c) est disposé pour exécuter au choix au moins l'un des modes de régulation suivants du groupe motopompe centrifuge (2),
    - une régulation de la température pour maintenir constante la température de l'eau potable,
    - une régulation du débit volumétrique pour maintenir le débit volumétrique constant dans le circuit (31) et/ou
    - une régulation de pression pour maintenir constante ou proportionnelle la différence de pression à travers le circuit.
  13. Unité compacte (1) selon l'une des revendications précédentes, caractérisée en ce que le circuit électronique de pompe (2c) présente une mémoire non volatile et est disposé pour documenter dans la mémoire des informations sur le réseau d'alimentation en eau potable, en particulier la température de l'eau potable transportée, l'activité de soutirage par des consommateurs et/ou des états d'erreur.
  14. Unité compacte (1) selon l'une des revendications précédentes, caractérisée en ce qu'elle présente un filtre à tamis (19) placé en amont du groupe motopompe centrifuge (2).
  15. Unité compacte (1) selon l'une des revendications précédentes, caractérisée en ce que le circuit électronique de pompe (2c) est disposé pour déclencher la valve de rinçage (7a) lorsqu'au moins l'une des conditions suivantes, surveillées par le circuit électronique de pompe (2c), est satisfaite :
    - la température de l'eau potable pompée dépasse une valeur limite ou
    - aucune activité de soutirage n'a été détectée dans le réseau d'alimentation en eau potable pendant une période prédéterminée ou
    - la fin d'une période est atteinte,
    et/ou fermer la valve de rinçage ouverte (7a) lorsqu'au moins l'une des conditions suivantes, surveillées par le circuit électronique de pompe (2c), est satisfaite :
    - la température de l'eau potable pompée descend en dessous d'une valeur cible ou
    - la température de l'eau potable pompée reste inchangée ou
    - une quantité prédéterminée d'eau potable a été vidangée ou
    - elle a été rincée pendant une période prédéterminée.
EP21186645.4A 2020-08-21 2021-07-20 Module compact pour une circulation d'eau Active EP3957860B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
LU102008A LU102008B1 (de) 2020-08-21 2020-08-21 Kompaktbaueinheit für eine Wasserzirkulation

Publications (2)

Publication Number Publication Date
EP3957860A1 EP3957860A1 (fr) 2022-02-23
EP3957860B1 true EP3957860B1 (fr) 2023-11-29

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Application Number Title Priority Date Filing Date
EP21186645.4A Active EP3957860B1 (fr) 2020-08-21 2021-07-20 Module compact pour une circulation d'eau

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EP (1) EP3957860B1 (fr)
LU (1) LU102008B1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006017807B4 (de) * 2006-04-13 2013-10-24 Gebr. Kemper Gmbh & Co. Kg Metallwerke Trinkwassersystem sowie Verfahren zum Betrieb eines solchen Systems
DE202015007277U1 (de) * 2015-10-20 2017-01-23 Gebr. Kemper Gmbh + Co. Kg Metallwerke Trink- und Brauchwasserversorgungseinrichtung
DE202018005578U1 (de) * 2018-11-30 2020-03-04 Gebr. Kemper Gmbh + Co. Kg Metallwerke Trink- und Brauchwassersystem

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LU102008B1 (de) 2022-02-21

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