[go: up one dir, main page]

EP3540234A1 - Groupe pompe centrifuge et procédé pour déplacer une valve dans un groupe pompe centrifuge - Google Patents

Groupe pompe centrifuge et procédé pour déplacer une valve dans un groupe pompe centrifuge Download PDF

Info

Publication number
EP3540234A1
EP3540234A1 EP18161525.3A EP18161525A EP3540234A1 EP 3540234 A1 EP3540234 A1 EP 3540234A1 EP 18161525 A EP18161525 A EP 18161525A EP 3540234 A1 EP3540234 A1 EP 3540234A1
Authority
EP
European Patent Office
Prior art keywords
valve element
drive motor
impeller
switching
switching position
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP18161525.3A
Other languages
German (de)
English (en)
Inventor
Thomas Blad
Christian BLAD
Peter Mønster
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Grundfos Holdings AS
Original Assignee
Grundfos Holdings AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Grundfos Holdings AS filed Critical Grundfos Holdings AS
Priority to EP18161525.3A priority Critical patent/EP3540234A1/fr
Priority to US16/980,023 priority patent/US11680571B2/en
Priority to PCT/EP2019/056081 priority patent/WO2019175135A1/fr
Priority to CN201980019023.8A priority patent/CN111919030B/zh
Priority to EP19710409.4A priority patent/EP3765748B1/fr
Publication of EP3540234A1 publication Critical patent/EP3540234A1/fr
Withdrawn legal-status Critical Current

Links

Images

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
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
    • F04D15/0016—Control, e.g. regulation, of pumps, pumping installations or systems by using valves mixing-reversing- or deviation valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • 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
    • 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
    • F04D13/0606—Canned motor pumps
    • 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
    • F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
    • 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
    • F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
    • F04D15/0022—Control, e.g. regulation, of pumps, pumping installations or systems by using valves throttling valves or valves varying the pump inlet opening or the outlet opening
    • 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
    • F04D15/0027—Varying behaviour or the very pump
    • F04D15/0038—Varying behaviour or the very pump by varying the effective cross-sectional area of flow through the rotor
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/02—Selection of particular materials
    • F04D29/026—Selection of particular materials especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
    • F04D29/4293—Details of fluid inlet or outlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/46—Fluid-guiding means, e.g. diffusers adjustable
    • F04D29/48—Fluid-guiding means, e.g. diffusers adjustable for unidirectional fluid flow in reversible pumps
    • F04D29/486—Fluid-guiding means, e.g. diffusers adjustable for unidirectional fluid flow in reversible pumps especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
    • F24D3/105—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system pumps combined with multiple way valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2250/00—Geometry
    • F05D2250/50—Inlet or outlet
    • F05D2250/51—Inlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/50—Intrinsic material properties or characteristics
    • F05D2300/501—Elasticity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2220/00—Components of central heating installations excluding heat sources
    • F24D2220/02—Fluid distribution means
    • F24D2220/0207—Pumps

Definitions

  • Centrifugal pump units as used, for example, as heating circulation pumps, usually have an electric drive motor and a driven by this impeller, which rotates in a pump housing. Furthermore, it is known to integrate directly into the pump housing a valve element, which makes it possible to switch the flow through the pump unit, which is generated by the impeller, between two flow paths. For this purpose, it is known to move such valve elements as a function of the direction of rotation of the impeller by the flow caused by the impeller. A disadvantage of these arrangements is that a drive motor must be present, which can be selectively driven in two directions of rotation. This requires a corresponding control electronics for driving the drive motor.
  • the centrifugal pump assembly according to the invention which may be particularly preferably designed as Bankungsum stiilzpumpenaggregat, has an electric drive motor and an impeller driven by this.
  • the impeller is arranged in a pump housing in which a movable valve element is further arranged.
  • the valve element is arranged in the pump housing so that it can flow through a flow generated by the impeller, i. h., A flow of the pumped liquid between two switching positions is movable.
  • the valve element is designed so that at least a portion of the valve element is movable by a pressure or fluid pressure generated by the impeller in the pump housing from a released position to an abutting position in which it is fixed to a contact surface.
  • the contact surface may particularly preferably be an inner surface of the pump housing.
  • the centrifugal pump assembly according to the invention also has a control device which serves to control the switching operation of the valve element between said switching positions.
  • the control device is designed such that it reduces the speed of the drive motor for moving the valve element from one switching position to another switching position and at a time when the pressure in the pump housing has dropped so far that the valve element is no longer fixed to the contact surface , And the valve element has been moved to the other switching position, the speed of the drive motor increases again.
  • This time can be determined in various ways, as set out below. So the time z. B. be determined or detected by a timer or by detecting the actual shift position. A reduction in the speed can mean that the speed is only reduced to a lower speed and the pump unit continues to run at this lower speed.
  • the lower speed is a speed at which the impeller on the output side generates a pressure which is below a limit pressure at which the valve element can be moved by the pressure in its adjacent position. That is, the rotational speed is so low that the valve element or the portion of the valve element remains in the released position.
  • the drive motor is controlled by the control device so that the drive motor is operated at a speed at which the output side pressure of the impeller is so high that the valve element in the adjacent position is held by the pressure.
  • control device and the drive motor are designed so that the drive motor so quickly reaches a sufficiently high speed when switching, that immediately such a high pressure for holding the valve element is achieved in the adjacent position before building a flow is, which could move the valve element from the current switching position.
  • a corresponding vote of the drive motor, control device and valve element is selected.
  • the control device is designed such that it reduces the speed of the drive motor to zero for moving the valve element from one switching position to another switching position, ie, turns off the drive motor and then or at a time when the pressure in the Pump housing has dropped so far that the valve element is not more is fixed to the contact surface and the valve element has been moved to the other switching position, the drive motor turns on again, ie the speed of the drive motor increases again, in particular increased to the normal operating speed.
  • the fact is exploited that the liquid flows in the peripheral region of the impeller and / or in a connected circuit due to their inertia even after switching off the drive motor for a certain time in a circle, whereby the flow thus can move the valve element during leakage ,
  • valve element is not moved when starting the drive motor from one switching position to the other switching position, but when turning off or shutting down the speed.
  • the control device may be designed such that it increases the rotational speed of the drive motor again after a predetermined period of time. That is, according to this embodiment, the timing for increasing the speed over a predetermined period of time is defined. This period of time extends between the shutdown of the rotational speed or the switching off of the drive motor and the subsequent increase in the rotational speed or the restarting of the drive motor. Such a fixed timing allows a very simple embodiment of the control device.
  • the switching can thus take place solely by means of a time control over permanently defined periods of time which are stored in the control device.
  • the times for restarting the drive motor or speed increase in other ways, for example via to determine at least one position sensor which detects the actual switching position of the valve element.
  • the time periods would thus not be predetermined, but would be detected metrologically.
  • a position sensor may be present which detects the switching position of the valve element and is signal-connected to the control device, and the control device may be configured to increase the speed of the drive motor again when the position sensor reaches the desired other Switch position signaled. D. h.,
  • the time for restarting the drive motor or speed increase is determined or detected based on the actual switching position of the valve element. The time is reached when the position sensor detects the switchover of the valve element.
  • a position sensor can be formed, for example, by a magnet arranged in the valve element whose position is detected by a magnetic sensor or reed contact. A combination of timing and position sensor is conceivable, for example, to ensure increased reliability.
  • the drive motor and the control device are configured such that when starting the drive motor, the impeller faster enough pressure to move the portion of the valve element in the applied position as a flow for moving the valve element in a different switching position generated.
  • the valve element can be kept as described in the achieved switching position.
  • the drive motor and the control device are configured such that when switching off the drive motor of the holding the portion of the valve element in the applied position pressure decreases faster than a flow for moving the valve element in the other switching position. The flow remains preferred due to the inertia still exist for a certain time.
  • the control device is designed such that it switches off the drive motor for switching the valve element from a first to a second switching position for a first predetermined period of time and for switching from the second to the first switching position the drive motor for a second predetermined Time, which is longer than the first period, turns off.
  • This embodiment is advantageous if the valve element is designed so that it is moved at the reduced speed or in the off state of the drive motor due to the still remaining flow from a first to a second switching position.
  • the flow will also decrease and preferably decrease so much that the valve member will move back to its first switch position. If in this first switching position then the speed of the drive motor is increased again or the drive motor is switched on again, the valve element is brought in the first switching position in the applied position by the pressure increase and fixed there for further operation. D. h., The switching position of the valve element is set or selected over the duration of the period for which the speed is reduced or the drive motor is switched off.
  • control device and the drive motor are designed such that the drive motor can be operated in only one predetermined direction of rotation.
  • D. h. There is no such control device is provided, via which the direction of rotation could be selected.
  • it may be a drive motor without speed setting. It may in particular be a drive motor, which is operated at mains frequency. More preferably, the drive motor is an asynchronous motor.
  • the invention has the advantage that it can thus be realized with conventional, comparatively simple drive motors without complex control electronics.
  • the centrifugal pump assembly has a control device, via which the rotational speed of the drive motor is variable, for example, to be able to realize a lowering of the rotational speed without completely switching off the drive motor.
  • the control device can in particular have a frequency converter, via which the drive motor is operated.
  • the pump housing has at least one connection, preferably at least two connections, and the valve element is designed such that it opens at least one flow path through the at least one connection in its at least two switching positions to different degrees. If two connections are present, these two connections are opened at different widths in the at least two switching positions. Thereby, a mixing ratio between the two terminals can be varied. Alternatively or additionally becomes special preferably realized a switching of the flow path between the two terminals.
  • the two connections can be on the pressure side or the suction side of the centrifugal pump assembly.
  • valve element is particularly preferably designed so that it releases a flow path through a first connection in a first switching position and a flow path through a second connection in a second switching position.
  • first switching position the flow path is preferably closed by the second connection, while in the second switching position the flow path is closed by the first connection.
  • the valve element is rotatably mounted in the pump housing such that it is rotatably movable between the switching positions, wherein preferably the valve element is rotatably mounted in the pump housing about an axis of rotation which is parallel and further preferably aligned with a rotational axis of the impeller extends.
  • the valve element extends with a wall or surface parallel to the end face of the impeller and / or circumferentially around the impeller.
  • the rotational mobility of the valve element allows for easy adjustment of the valve element, since the valve element by a ring flow, which forms in the peripheral region of the impeller during its rotation, can be moved.
  • the ring flow acts in particular on the rotationally mounted valve element via frictional forces.
  • the valve element adjoins with at least one wall to a pressure chamber, which surrounds the impeller.
  • the valve element thus preferably has at least one flow engagement surface on which the flow generated by the impeller acts to move the valve element, wherein the flow engagement surface preferably surrounds the impeller Flow or pressure chamber limited.
  • the fact that the flow attack surface forms a boundary wall of the flow space it is achieved that the flow resistance in the centrifugal pump assembly is not substantially increased, since an already existing boundary wall of the flow space is now formed by the valve element.
  • the flow attack surface is preferably shaped such that the flow can exert a force on the wall, in particular parallel to the extension direction of the wall, in order to move along the wall and thus the valve element with the flow.
  • structuring or protrusions may be provided on the flow engagement surface for this purpose in order to allow a better force action of the flow on the valve element.
  • the valve element has a return means or return element.
  • a return means may be formed for example in the form of a spring, a magnet and / or a weight.
  • the return means is preferably designed so that it moves the valve element at a standstill of the impeller when no flow acts on the valve element in a predetermined switching position. This can be, for example, the first switching position.
  • a return means ensures that, when the drive motor is switched off, when the valve element has moved into its released position, the valve element always automatically moves into a predetermined starting position, namely the predetermined switching position, due to the return means. It can thereby be achieved that even when the drive motor can be driven only in one direction of rotation, the valve element can still be moved back in the opposite direction of rotation.
  • the movement in the opposite direction of rotation is then effected by the return means.
  • the provision of such a reset element is further preferably realized in combination with the above-described timing for the switching operations.
  • the use of a return element allows the Resetting the valve element in a known period of time, so that can be determined over a predetermined period of time in the control device, the time at which the drive motor must be turned on again or the speed must be increased again.
  • a force generating means preferably a spring, which acts on the valve element or its at least one portion from the applied position in the released position with force.
  • the force generating means thus causes the valve element to be returned to the released position when the pressure in the surrounding area of the impeller is reduced.
  • the pressure generated by the impeller and acting on the valve member exceeds a threshold at which the force of the force generating means is overcome, the valve member is moved against the force of the force generating means to the applied position.
  • an automatically releasing coupling between the valve element and a contact surface is created.
  • an elastic restoring force which is generated in the section itself, serve as a force generating means, which moves the valve element back to its original position.
  • the force generating means and the drive motor are matched to each other.
  • a sufficient pressure is required.
  • the drive motor preferably has a correspondingly adapted start-up behavior in order to be able to reach this pressure in the manner described above so quickly that no sufficient flow builds up to move the valve element into another switching position.
  • the power generating in particular a spring, designed so that it applies a sufficiently large force to move the valve element as quickly as possible in pressure drop again in its released position and to ensure in this the mobility of the valve element between the switching positions.
  • the control device has at least one signal input or a sensor, from which the control device can receive at least one switching signal. Furthermore, the control device is preferably designed such that it controls the drive motor upon receipt of the switching signal so that the valve element is moved from one switching position to the other switching position. Particularly preferably, the control device is designed so that it then turns off and on again the drive motor for the aforementioned time periods described above, in order to achieve the desired switching position.
  • the signal input can be wired or wireless, for example as a radio interface, be formed.
  • a signal cable can be passed through a suitable opening or via a suitable connector plug into the interior of an electronics housing, in which the control electronics are arranged.
  • this sensor can be designed to detect an event, such as a flow in a line, on the basis of which it is desired to switch over the switching position. This is the case, for example, in heating systems in which, in addition to a building temperature control, the heating of service water should be effected. If a domestic water flow is detected in such a heating system, it is a switching over of a switching valve, for example of the invention Valve element required to open a flow path through a heat exchanger for heating the service water.
  • the control device can be arranged in an electronics housing and in the electronics housing, a sensor for generating the switching signal can be arranged, wherein the sensor is a magnetic sensor, which can detect the displacement of a magnetic field generated outside the electronics housing.
  • a flow sensor having a moving magnet can be placed directly in the vicinity of the electronics housing or terminal box so that movement of the magnet can be detected by the magnetic sensor.
  • a contactless signal transmission into the interior of the electronics housing can be achieved.
  • a conventional electronics housing or a conventional terminal box may be used, which does not require an additional opening to supply the signal of a flow sensor to a control device arranged in the interior of the electronics housing.
  • the subject matter of the invention is a method for moving a valve element arranged in a centrifugal pump unit.
  • This is in particular a centrifugal pump unit according to the preceding description.
  • reference is therefore also made to the preceding description of the centrifugal pump unit.
  • the method steps described in connection with the centrifugal pump assembly are also preferred embodiments of the method described below.
  • the inventive method for moving a valve element in a centrifugal pump assembly is intended for use with a valve element, which is arranged and designed such that it can be moved by a flow generated by an impeller of the centrifugal pump assembly from a switching position to a second switching position. Further, at least a portion of the valve element, more preferably the entire valve element, is movable by a pressure generated by the impeller from a released position to an abutting position in which it is fixed to a contact surface. In the released position, the valve element is movable between the switching positions, while it is fixed in the adjacent position in a switching position against movement in the other switching position.
  • the method according to the invention has two essential steps.
  • a first step the speed of the drive motor is reduced or the drive motor is completely switched off, whereby the pressure on the output side of the impeller is reduced so much that the valve element or at least a portion of the valve element is no longer fixed in the adjacent position, but in the reached solved position.
  • This may, as described above, preferably be achieved by a force generating means acting on the valve member or its described portion.
  • the valve element is moved by the flow generated by the impeller from a first to a second switching position. This is done, as described above, preferably by rotation of the valve element.
  • a second step the rotational speed of the drive motor is then increased again or the drive motor is switched on again, so that the pressure on the output side of the impeller is increased such that the valve element or its at least one section moves into the applied position and is fixed there by the pressure , D. h., After restarting the drive motor, the valve element is thus fixed in the previously achieved switching position by the contact of the valve element to a contact surface.
  • the time to restart the Drive motor or to increase the speed can be determined in the manner described above with reference to the device.
  • the drive motor for moving the valve element from the second to the first switching position is turned off until the flow has subsided on the output side of the impeller.
  • the valve element by a return element, as described above be moved back into the first switching position.
  • This is preferably a movement against a direction of motion caused by the flow during operation of the drive motor.
  • the drive motor is put into operation, that on the output side of the impeller builds a pressure which moves the valve element or its at least one section in the applied position, before building up a flow which would move the valve element in the second switching position.
  • the drive motor is approached so quickly that immediately builds up such a high pressure that the valve element passes into the applied position before it can be moved out of the reached switching position.
  • the drive motor is switched off for a shorter period of time or the speed is reduced for a shorter period of time. In this case, this is a period of time which has such a length that, due to the inertia of the liquid, a flow remains which can move the valve element into the second switching position.
  • the time periods can, as described above, be fixed or it is possible to detect the end times of the periods, for example, by detecting the achieved switching position of the valve element. In this regard, reference is made to the above description.
  • centrifugal pump unit is for installation in a hydraulic block, ie a hydraulic unit for a heating system, in particular a compact heating system, provided as shown schematically in FIG Fig. 12 is shown.
  • the centrifugal pump unit has a pump housing 2 with a motor housing 4 attached thereto.
  • an electric drive motor consisting of a stator 6 and a rotor 8 is arranged in a known manner.
  • the drive motor shown is designed as a wet-running electric drive motor, in which the rotor space, in which the rotor 8 rotates, is separated from the surrounding stator space, in which the stator 6 is located, by a split pot or a can 10.
  • the rotor 8 is rotationally fixed via a rotor shaft 12 connected to an impeller 14.
  • a terminal box 16 is arranged, which includes the electrical connections and required electrical and electronic components for controlling the drive motor.
  • the pump housing 2 in which the impeller 14 rotates, has two suction ports 18 and 20 and a pressure port 22.
  • a rotatable valve element 24 is arranged, which is drum-shaped in this embodiment.
  • the valve member 24 serves to selectively establish a flow connection from one of the suction ports 18, 20 to the suction port 26 of the impeller 14.
  • the valve element 24 is formed by a cup-shaped lower part 28 and a cover 30. Both are firmly connected.
  • the cover 30 has centrally an opening with an annular collar, which forms an inlet pipe 32 which engages in the suction mouth 26 of the impeller 14.
  • the lower part 28 is fixed to a bearing sleeve 34. This could also be formed integrally with the lower part.
  • the bearing sleeve 34 is supported on the bottom of the pump housing 2 via a spring 36 designed as a compression spring. Thus, the spring 36 presses the valve element 24 in the in Fig. 7 shown detached position.
  • the bearing sleeve 34 is also rotatably mounted on a bearing pin 46, which extends in the direction of the longitudinal axis X, starting from the bottom into the interior of the pump housing 2 inside.
  • the bearing pin 76 engages in a longitudinally extending hole in the bearing sleeve 34, so that the bearing sleeve 34 is slidably mounted on the bearing pin 46.
  • the bearing pin 46 is fixed in the bottom of the pump housing 2.
  • the bearing sleeve 34 can slide in addition to the rotational movement in the longitudinal direction X on the bearing pin 46 when the valve element 24th from the in Fig. 7 shown dissolved position in the in Fig. 6 shown applied adjacent position is moved.
  • the storage of the bearing sleeve 34 on the bearing pin 46 thus allows both a rotational movement and an axial movement in this embodiment.
  • the valve element 24 has in its lower part 28 a switching opening 48, as in 3 and 4 you can see. In the illustrations in 3 and 4 the lid 30 is removed.
  • the switching opening 48 is located in the bottom surface of the lower part 28, which extends transversely to the longitudinal or rotational axis X.
  • the switching opening 48 is radially spaced from the axis of rotation X, so that it moves on rotation of the valve member 24 about the axis of rotation X on an arcuate path in a different angular position.
  • Fig. 3 shows the first switching position of the valve element 24, in which the switching opening 48 covers an inlet opening 50 in the bottom of the pump housing 2.
  • the inlet opening 50 is in fluid communication with the suction port 20.
  • the switching opening 48 is in register with an inlet opening 52, which is in flow communication with the suction port 8.
  • a restoring element in the form of a weight 54 is also arranged or formed.
  • the weight 54 is also spaced from the axis of rotation X so that it can generate torque about the axis of rotation X.
  • the weight 54 is placed so that it is in the in Fig. 3 shown first switching position in the illustrated installation position of the pump unit is shown below. In the given installation position, the rotation axis X always extends horizontally.
  • the valve element 24 has on its outer side a stop element 56 which extends away from the bottom 28 parallel to the longitudinal axis X and in the form of a projection or a rib.
  • This stop element 56 occurs in the in Fig. 4 shown second switching position with a second stop member 58 in the form of a solid rib in the interior of the pump housing 2 in Appendix.
  • the rotational movement of the valve element 24 is limited so that it does not have the second switching position, which in Fig. 4 is shown, can be turned out.
  • valve element 24 In addition to the movement between the two switching positions, the valve element 24, as stated, perform an axial movement along the longitudinal axis X, as in Fig. 6 and 7 is shown.
  • the valve member 24 In Fig. 6 the valve member 24 is in an abutting position in which it is pressed by the output pressure generated by the impeller 14 into abutment with the pump housing 2.
  • the pressure generated by the impeller 14 acts on the surface of the cover 30 facing the impeller.
  • the suction-side pressure of the circulating pump assembly acts on the rear side of the cover 30 in the interior of the valve element 24.
  • the lower part 28 comes to an annular shoulder 60 in the interior of the pump housing in tight contact.
  • the suction side is sealed against the pressure side by the valve element 24 and the valve element 24 also fixed non-positively in the pump housing 2, so that it can not be rotated between the switching positions.
  • the fluid pressure acting on the cover 30 decreases, so that the pressure force is reduced and the spring force of the spring 36 again exceeds this pressure force.
  • the valve element 24 moves in the in Fig. 7 shown dissolved position, in which the lower part 28 of the valve element 24 of the paragraph 60th lifts, thus no longer frictionally held on the bottom of the pump housing 2 and can rotate freely between the switching positions.
  • the spring 36 and the drive motor are coordinated so that the drive motor generates a pressure which makes it possible to overcome the force of the spring 36 for displacing the valve element 24.
  • the spring is dimensioned so that, when the pressure falls below a certain limit, the valve element 34 in the in Fig. 6 can move shown dissolved position.
  • a control electronics 62 which controls the switching operation by rotation of the valve element 44.
  • the drive motor shown here is a conventional unregulated asynchronous motor, which is not controlled by a frequency converter. Ie. An electronic speed change is not provided. Rather, the control electronics 64 is preferably designed only so that it can turn off the drive motor targeted for certain periods of time.
  • the switching operation of the valve element 24 takes place only by switching off the drive motor for predetermined periods of time. Instead of a pure time control, the switching position of the valve element 24 could also be detected in order to determine or define the end of the respectively required time span.
  • valve element 24 In the starting position, the valve element 24 is in the in Fig. 3 shown first switching position, since the weight 54, the valve element 24 automatically rotates in this position.
  • the drive motor is designed so that when it is switched on in the peripheral region of the impeller 14 directly such a high pressure builds up that the valve element 24 in the in Fig. 6 shown fitting position is pressed and held in this frictionally. D. h., In this state, the impeller promotes fluid through the suction port 20 into the pressure port 22.
  • the control electronics 64 now the drive motor for a short period of time off, which is selected so that the pressure in the peripheral region of the impeller 14 is reduced so that the valve element 24 is moved by the spring 36 in the released position, the valve element 24 can be rotated to the second switching position shown.
  • the control electronics 64 switch off the drive motor for a second, longer period of time. This period of time is chosen so that not only the pressure in the surrounding area of the impeller 14 is reduced, but also the ring flow decreases so much that the torque caused by the weight 54 is greater and the valve element 24 can turn back to the first switching position. Thereafter, the drive motor can then be put into operation again so that the valve element 24 is held in this switching position by the immediate pressure build-up. Also for this switching operation, the control device can select a pure time control. Alternatively, it is also possible here to actually detect the switching position of the valve element 24.
  • the control electronics 64 has a near the outer wall of the terminal box 16 located magnetic sensor 66. This can generate a signal which causes the control electronics 64 to switch the switching positions.
  • a tubular element 68 is arranged, in which a movable sensor body 70 is arranged for detecting a flow. If there is no flow through the pipe element 68, the sensor body 70 is held, for example, by a spring element, in which Fig. 9 shown rest position.
  • a magnet 72 is arranged in the sensor body 70.
  • the magnetic sensor 66 In the in Fig. 9 shown rest position of the magnet 70 is the magnetic sensor 66, which may be, for example, a reed contact, not opposite.
  • the sensor body 70 is inserted into the in Fig. 10 shifted position, whereby the magnet 72 comes in a position opposite to the magnetic sensor 66.
  • the magnetic sensor 66 detects the magnetic field of the magnet 72 and outputs a switching signal that can cause the valve element 24 to switch.
  • the centrifugal pump unit described is used for example in a heating system, as in Fig. 12 is shown.
  • the heating system has two circuits, a heating circuit 74, which is used to heat a building and a circle 76 through a secondary heat exchanger 78 for heating domestic water.
  • Both the heating circuit 74 and the second circuit 76 branch off from an outlet of a primary heat exchanger 80, which may be formed, for example, by a gas boiler.
  • a centrifugal pump unit 82 On the input side of the primary heat exchanger 80, a centrifugal pump unit 82, which corresponds to the preceding centrifugal pump unit, is arranged. From the pressure port 22 of the centrifugal pump unit 82, the heat carrier flows into the primary heat exchanger 80.
  • the return of the heating circuit 74th is connected to the suction port 20, while the return from the secondary heat exchanger 78 is connected to the suction port 18.
  • the described pipe element 68 is located with the flow monitor, which is formed by the sensor body 70.
  • a safety function which can prevent overheating of the primary heat exchanger 80, can be realized. If, for example, all radiator valves in the heating circuit 74 are closed and no more heat is removed, this can be detected by a temperature sensor. If now in this state, the centrifugal pump unit 82 is switched off briefly, the valve member 24 moves back to the second switching position. In this then a cycle on the secondary heat exchanger 78 can be maintained.
  • the switching over the valve element takes place on the suction side of the impeller 14.
  • the pump housing 2 ' has two pressure ports 22' and only one suction port 18 '.
  • the valve element 24 ' is cup-shaped and surrounds the impeller 14, so that the flow generated by the impeller 14 and the pressure generated by the impeller 14 in the interior of the valve element 24' act.
  • the valve element 24 ' has inside an inlet port 32', which, as described above, with the suction port of the impeller 14 is engaged.
  • a weight 54 ' is arranged in the valve element 24'.
  • valve element 24 ' can be pressed by a spring 36 in a released position and pressed against the spring force of the pressure in the interior of the valve element 24' in a voltage applied to the pump housing 2 'position.
  • the valve element 24 ' has a switching opening 48' in a rear wall or outer circumferential wall, which is in a switching position with an outlet opening 84 in register, so that a flow path from the interior of the valve element 24 'is given to a first of the pressure ports 22'.
  • the switching opening 48 ' In the second switching position, the switching opening 48 'is brought into coincidence with a second outlet opening 84, so that a flow path to the second pressure connection 22' is opened.
  • the switching of the valve element 24 'between the switching positions takes place in the same manner as described above with reference to the first embodiment.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
EP18161525.3A 2018-03-13 2018-03-13 Groupe pompe centrifuge et procédé pour déplacer une valve dans un groupe pompe centrifuge Withdrawn EP3540234A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP18161525.3A EP3540234A1 (fr) 2018-03-13 2018-03-13 Groupe pompe centrifuge et procédé pour déplacer une valve dans un groupe pompe centrifuge
US16/980,023 US11680571B2 (en) 2018-03-13 2019-03-12 Centrifugal pump unit and method for moving a valve element in a pump unit
PCT/EP2019/056081 WO2019175135A1 (fr) 2018-03-13 2019-03-12 Unité de pompe centrifuge et procédé de déplacement d'un élément de soupape dans une telle unité de pompe centrifuge
CN201980019023.8A CN111919030B (zh) 2018-03-13 2019-03-12 离心泵机组以及用于使这种泵机组中的阀元件运动的方法
EP19710409.4A EP3765748B1 (fr) 2018-03-13 2019-03-12 Groupe pompe centrifuge et procédé pour déplacer une valve dans un tel groupe pompe centrifuge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18161525.3A EP3540234A1 (fr) 2018-03-13 2018-03-13 Groupe pompe centrifuge et procédé pour déplacer une valve dans un groupe pompe centrifuge

Publications (1)

Publication Number Publication Date
EP3540234A1 true EP3540234A1 (fr) 2019-09-18

Family

ID=61628235

Family Applications (2)

Application Number Title Priority Date Filing Date
EP18161525.3A Withdrawn EP3540234A1 (fr) 2018-03-13 2018-03-13 Groupe pompe centrifuge et procédé pour déplacer une valve dans un groupe pompe centrifuge
EP19710409.4A Active EP3765748B1 (fr) 2018-03-13 2019-03-12 Groupe pompe centrifuge et procédé pour déplacer une valve dans un tel groupe pompe centrifuge

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP19710409.4A Active EP3765748B1 (fr) 2018-03-13 2019-03-12 Groupe pompe centrifuge et procédé pour déplacer une valve dans un tel groupe pompe centrifuge

Country Status (4)

Country Link
US (1) US11680571B2 (fr)
EP (2) EP3540234A1 (fr)
CN (1) CN111919030B (fr)
WO (1) WO2019175135A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3904738A1 (fr) * 2020-04-28 2021-11-03 Grundfos Holding A/S Dispositif de soupape hydraulique et ensemble e pompe centrifuge comprenant un tel dispositif de soupape hydraulique
EP3904689A1 (fr) * 2020-04-28 2021-11-03 Grundfos Holding A/S Ensemble pompe centrifuge

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102525194B1 (ko) * 2021-02-09 2023-05-08 지엠비코리아 주식회사 워터펌프 및 밸브 통합장치
US12297843B2 (en) * 2022-06-08 2025-05-13 Cooper-Standard Automotive Inc. Multiport fluid pump with integrated valve
USD1102484S1 (en) * 2023-09-27 2025-11-18 Fujian Snowman Compressor Co., Ltd Centrifugal compressor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9013992U1 (de) * 1990-10-08 1991-10-24 Grundfos International A/S, Bjerringbro Motorpumpenaggregat für Kreislaufsysteme mit zwei parallelen Kreisläufen
US5924432A (en) * 1995-10-17 1999-07-20 Whirlpool Corporation Dishwasher having a wash liquid recirculation system
US20040071547A1 (en) * 2002-10-15 2004-04-15 Anton Elexpuru Bidirectional hydraulic pump
US20040173249A1 (en) * 2001-07-07 2004-09-09 Walter Assmann Dishwasher comprising spraying arms and a circulating pump
US20170356449A1 (en) * 2014-12-22 2017-12-14 Grundfos Holding A/S Hydraulic system

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1955549A (en) * 1931-08-21 1934-04-17 John T Janette Combined pump and valve
DE4418153A1 (de) * 1994-05-25 1995-11-30 Wilo Gmbh Kreiselpumpe
CN105745450B (zh) * 2013-11-16 2017-10-24 博泽沃尔兹堡汽车零部件有限公司 电动冷却剂泵
EP3376036A1 (fr) * 2017-03-14 2018-09-19 Grundfos Holding A/S Groupe motopompe

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9013992U1 (de) * 1990-10-08 1991-10-24 Grundfos International A/S, Bjerringbro Motorpumpenaggregat für Kreislaufsysteme mit zwei parallelen Kreisläufen
US5924432A (en) * 1995-10-17 1999-07-20 Whirlpool Corporation Dishwasher having a wash liquid recirculation system
US20040173249A1 (en) * 2001-07-07 2004-09-09 Walter Assmann Dishwasher comprising spraying arms and a circulating pump
US20040071547A1 (en) * 2002-10-15 2004-04-15 Anton Elexpuru Bidirectional hydraulic pump
US20170356449A1 (en) * 2014-12-22 2017-12-14 Grundfos Holding A/S Hydraulic system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3904738A1 (fr) * 2020-04-28 2021-11-03 Grundfos Holding A/S Dispositif de soupape hydraulique et ensemble e pompe centrifuge comprenant un tel dispositif de soupape hydraulique
EP3904689A1 (fr) * 2020-04-28 2021-11-03 Grundfos Holding A/S Ensemble pompe centrifuge
WO2021219539A1 (fr) * 2020-04-28 2021-11-04 Grundfos Holding A/S Ensemble soupape hydraulique et ensemble pompe centrifuge doté d'un tel ensemble soupape hydraulique
WO2021219540A1 (fr) * 2020-04-28 2021-11-04 Grundfos Holding A/S Ensemble de pompes centrifuges
CN115485495A (zh) * 2020-04-28 2022-12-16 格兰富控股公司 液压阀装置和包括该液压阀装置的离心泵组件
US12158212B2 (en) 2020-04-28 2024-12-03 Grundfos Holding A/S Hydraulic valve device and centrifugal pump assembly including such hydraulic valve device
US12180968B2 (en) 2020-04-28 2024-12-31 Grundfos Holding A/S Centrifugal pump assembly

Also Published As

Publication number Publication date
US20210010477A1 (en) 2021-01-14
US11680571B2 (en) 2023-06-20
CN111919030B (zh) 2022-12-02
EP3765748B1 (fr) 2024-07-03
WO2019175135A1 (fr) 2019-09-19
EP3765748C0 (fr) 2024-07-03
CN111919030A (zh) 2020-11-10
EP3765748A1 (fr) 2021-01-20

Similar Documents

Publication Publication Date Title
EP3765748B1 (fr) Groupe pompe centrifuge et procédé pour déplacer une valve dans un tel groupe pompe centrifuge
EP3765747B1 (fr) Groupe pompe centrifuge avec valve rotative
EP2453555B1 (fr) Groupe motopompe
EP2798224B2 (fr) Groupe de pompe
EP3376037B1 (fr) Groupe pompe centrifuge
DE102005035655A1 (de) Elektromagnetischer Anlassschalter
DE10150175A1 (de) Magnetische Lüfterkupplung
DE10323900A1 (de) Mehrwegeventil für ein Fahrzeug-Kühl/Heiz-System
DE102007000426A1 (de) Elektrisches Schaltsteuersystem für eine Automatikgetriebevorrichtung und Verfahren für selbiges
DE102012106076A1 (de) Elektrisch betätigte Lenkradschloßeinrichtung
EP3267042B1 (fr) Groupe motopompe
DE102010050605A1 (de) Vorrichtung zur Regelung eines Kühlmittelstroms sowie Kühlsystem
WO2018167043A1 (fr) Groupe motopompe
DE102020207431A1 (de) Elektrische Maschine mit Rotorkühlung
EP2818726A1 (fr) Pompe centrifuge avec roue à aubes déplaçable axialement pour l'alimentation de circuits différents
WO2015067439A1 (fr) Procédé de diagnostic pour diagnostiquer le bon fonctionnement d'un système de chauffage et/ou de refroidissement
EP3662205A1 (fr) Dispositif de mélange et procédé de régulation de températion d'un écoulement de liquide
EP0407750B1 (fr) Accouplement à friction de liquide
DE102013114597B4 (de) Variable Lüfterkanalkupplungsvorrichtung
DE112014002602T5 (de) Ölpumpenantriebssteuervorrichtung
EP2818725B1 (fr) Pompe centrifuge avec roue à aubes déplaçable axialement et obturable
EP2002123B1 (fr) Pompe a fluide
DE102018219837B4 (de) System mit einer Elektromaschine und einem Getriebe
EP3376040B1 (fr) Groupe motopompe
EP2067430B1 (fr) Appareil ménager, notamment lave-vaisselle doté d'une pompe de recirculation et chauffage intégré

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN PUBLISHED

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20200603