EP3540225A1 - Steuerungsvorrichtung für pumpen - Google Patents

Steuerungsvorrichtung für pumpen Download PDF

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Publication number
EP3540225A1
EP3540225A1 EP19162490.7A EP19162490A EP3540225A1 EP 3540225 A1 EP3540225 A1 EP 3540225A1 EP 19162490 A EP19162490 A EP 19162490A EP 3540225 A1 EP3540225 A1 EP 3540225A1
Authority
EP
European Patent Office
Prior art keywords
hollow body
control device
control unit
control
electric pump
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.)
Granted
Application number
EP19162490.7A
Other languages
English (en)
French (fr)
Other versions
EP3540225B1 (de
Inventor
Enrico Raddi
Lorenzo Raddi
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.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP3540225A1 publication Critical patent/EP3540225A1/de
Application granted granted Critical
Publication of EP3540225B1 publication Critical patent/EP3540225B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/02—Stopping, starting, unloading or idling control
    • F04B49/025—Stopping, starting, unloading or idling control by means of floats
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/04—Regulating by means of floats
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • 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
    • F04D15/02—Stopping of pumps, or operating valves, on occurrence of unwanted conditions
    • F04D15/0209—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the working fluid
    • F04D15/0218—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the working fluid the condition being a liquid level or a lack of liquid supply
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/18—Switches operated by change of liquid level or of liquid density, e.g. float switch
    • H01H35/186—Switches operated by change of liquid level or of liquid density, e.g. float switch making use of a cable suspended floater containing an inclination sensing switch

Definitions

  • This invention relates to the field of the hydraulic machines, in particular a control device for pumps and a level regulator comprising the above-mentioned control device.
  • Devices for controlling pumps known as floating switches and comprising a floating body connected to a pump by means of a flexible cable.
  • the floating body is configured so that it can be placed in a chamber or tank "P" and, if totally or partly immersed in a liquid, be subject to a pair of forces which determine a moment on the floating element such as to incline it with an angle depending on the height of the liquid in the chamber or tank "P".
  • the pair of forces consists of the hydrostatic force directed upwards and the opposing force directed downwards applied by the cable which fixes the floating body to the pump.
  • the floating body in the prior art devices comprises a sensor for measuring the inclination, which normally consists of a ball or a sliding body which can be moved along a guide in such a way as to activate a switch when the guide (and, therefore, the floating body) reaches a angle of inclination greater than a predetermined threshold.
  • level regulators comprising a floating switch configured as described above connected, on the side of the pump, to a control panel which switches the currents coming from the sensor into higher intensity currents, in such a way as to operate pumps with a greater power.
  • the technical purpose which forms the basis of this invention is to provide a control device for pumps and a relative level regulator which overcomes at least some of the above-mentioned drawbacks of the prior art.
  • the aim of this invention is to provide a control device for pumps and a relative level regulator which can increase the electrical power available for powering the electric pump.
  • a further aim of this invention is to provide a control device for pumps and a relative level regulator which is less bulky than prior art devices.
  • control device 1 a control device for pumps is indicated generically with the reference numeral 1 and it will be referred to below as "control device 1".
  • the control device 1 comprises a hollow body 5 extending about an axis or main plane of extension in such a way as to have, in at least one condition of use, the above-mentioned plane or main axis of extension oriented substantially parallel to the horizontal plane.
  • the hollow body 5 extends along a main axis of extension and has a portion with increasing cross-section along the above-mentioned axis of extension and a rounded end portion at the end of the portion with increasing cross-section, in such a way as to be provided with a greater displacement (and therefore buoyancy) at the side of the rounded end portion.
  • the hollow body 5 has a substantially rounded shape having a centre of hydrostatic thrust not coinciding with the centre line of the same, but moved more to the side of the rounded end portion.
  • the hollow body 5 is connected at the end of a flexible element 10 and configured to be positioned in a chamber or tank "P" for controlling the level of liquid present therein.
  • the flexible element 10 comprises a flexible cable 11 connectable to an electric pump 101, configured to apply on the hollow body 5 a constraining force which, in combination with the weight force acting on the hollow body 5, balances the buoyancy thrust and defines a centre of rotation about which the hollow body 5 can rotate by modifying its inclination relative to a horizontal plane.
  • the hollow body 5 has a shape such as to determine a buoyancy thrust acting on it which defines an arm relative to the above-mentioned centre of rotation, in such a way as to apply a moment on the hollow body 5 and determine a change in its inclination relative to the horizontal plane as a function of the volume of the immersed portion.
  • the flexible cable 11 is connected to the hollow body 5 in such a way as to protrude from it along an incident direction and preferably substantially perpendicular to the main axis of extension (or of the main plane of extension in the embodiment wherein the hollow body 5 has one).
  • the flexible cable 11 of the control device 1 is connected to the hollow body 5 in such a way as to be substantially parallel or slightly angularly spaced relative to the direction of the hydrostatic thrust force acting on it when the hollow body 5 is positioned according to the orientation typical of a configuration of normal use, except for variations of inclination due to the configuration of use in relation to the level of water in the chamber or tank "P".
  • the flexible cable 11 is connected to the hollow body 5 at a lateral surface close to an end portion of it, in particular of the end portion opposite the rounded end portion described above, in such a way as to be spaced from the portion with greater buoyancy.
  • the hydrostatic thrust force which is directed upwards and of variable intensity as a function of the volume of the immersed part of the hollow body 5, the weight force directed downwards and the tension of the flexible cable 11 contribute to determining the equilibrium of forces of the hollow body 5 (and therefore its orientation in space).
  • the flexible cable 11 and its connection with the hollow body 5 are configured for balancing any differences between the weight force and the of hydrostatic thrust force.
  • the weight of the hollow body 5 is greater than the intensity of the hydrostatic thrust force and the flexible cable 11 is configured to exert a tension upwards on the hollow body 5 to keep it at least partly raised relative to the bottom of the chamber or tank "P".
  • the weight of the hollow body 5 is less than the intensity of the hydrostatic thrust force and the flexible cable 11 is configured to apply a downward thrust on the hollow body 5.
  • connection point between the flexible cable 11 and the hollow body 5 determines the position of the centre of rotation of the hollow body 5 with regard to the rotations due to the variations of the thrust force.
  • the flexible cable 11 is connected to the hollow body 5 in a position moved away from the centre of hydrostatic thrust in such a way as to determine an arm between the centre of hydrostatic thrust and the centre of rotation, corresponding to the moment arm of the hydrostatic thrust force acting in use on the hollow body 5.
  • the above-mentioned arm is large enough to allow, in use, a variation of inclination of the hollow body 5 as a function of the intensity of the hydrostatic thrust force.
  • the arm is configured for determining a variation of inclination of the hollow body 5 as a function of the volume of the immersed portion of it, and therefore, in a condition of use, the quantity of liquid in the chamber or tank "P".
  • the arm is defined by the distance between the respective vertical projections on the axis (or plane) of main extension of the centre of rotation and the centre of hydrostatic thrust in an operating configuration of the control device 1, for example an operating configuration wherein the above-mentioned axis or plane of vertical extension is horizontal.
  • the hollow body 5 supports a printed circuit 14 and forms an impermeable casing for the printed circuit 14 and the flexible cable 11 has on the inside of a plurality of electrical contacts configured to connect the printed circuit 14 to the electric pump 101.
  • the hollow body 5 supports an orientation sensor 15 which is configured for measuring an angle relative to a horizontal plane and switching the angle to an electrical output signal.
  • the orientation sensor 15 comprises a rotary or slidable body positioned on a guide and movable along it by the force of gravity as a function of the inclination of the guide and a switch positioned along the guide in such a way as to be able to be activated by the rotary or slidable body in the presence of a predetermined angle of inclination of the guide (and therefore of the hollow body 5).
  • the above-mentioned switch is connected to the printed circuit 14 or preferably linked or integrated with it in such a way as to transmit the output signal to a control unit 16, positioned at the hollow body 5 and preferably also integrated in the printed circuit 14.
  • control device 1 comprises a power supply terminal, connected to the control unit 16 for connecting it to a source of electrical power 102 through the flexible cable 11.
  • the power supply terminal comprises a first phase connection 17a and a neutral connection 17b associated with it.
  • control device 1 comprises a control terminal connected to the control unit 16 preferably comprising a second phase connection 18 which passes through the flexible cable 11.
  • control unit 16 is configured to determine a power current in the control terminal as a function of the output signal coming from the orientation sensor 15.
  • the above-mentioned power current is such as to actuate an electric pump 101 of a level regulator 100 to which the control device 1 can be connected by means of the flexible cable 11 in such a way that the control terminal is connected to the power supply circuit of the same.
  • control unit 16 comprises an actuation relay 20 controlled by the output signal of the orientation sensor 15 and connected to the first and second phase connection 17a and 18 in such a way as to establish and interrupt an electrical contact between them in a controlled manner in such a way as to establish and interrupt the power supply to the electric pump 101.
  • control device 1 also comprises an earthing connection 19 which passes through the flexible cable 11 for earthing all the electrical components supported by the hollow body 5.
  • the components listed above which constitute the power supply and/or control terminals and the control unit 16 are dimensioned and configured for operating in the presence of currents even greater than 16 inductive amperes and, in particular, are suitable for operating in the presence of electric currents of between 9 and 22 inductive amperes, preferably between 11 and 16 inductive amperes.
  • Another object of the invention is a level regulator 100 comprising the control device 1 described above, an electric pump 101 electrically connected to the second phase connection 18 and to the neutral connection 17b and a source of alternating current electrical power 102 electrically connected to the first phase connection 17a and to the neutral connection 17b.
  • the control device 1, depending on the orientation of the hollow body 5 establishes and/or interrupts the electrical connection between the electrical power source 102 and the electric pump 101 in such a way as to control the level of liquid in the chamber or tank "P".
  • the electric pump 101 and the electrical power source 102 are configured for the operation in the presence of currents of between 9 and 16 Amperes, preferably between 11 and 14 Amperes.
  • the invention achieves the set aim by obviating the drawbacks of the prior art.
  • control device and the regulator level described thanks to the mutual configuration of the orientation sensor and control unit and the respective terminals, allow the use of electric pumps with a higher power compared with the prior art in which the switch opens and closes directly the circuit for powering the electric pump and without requiring the use of additional control panels, thus allowing a greater elasticity of use and resulting in a reduced overall size.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
EP19162490.7A 2018-03-14 2019-03-13 Steuerungsvorrichtung für pumpen Active EP3540225B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102018000003542A IT201800003542A1 (it) 2018-03-14 2018-03-14 Dispositivo di controllo per pompe

Publications (2)

Publication Number Publication Date
EP3540225A1 true EP3540225A1 (de) 2019-09-18
EP3540225B1 EP3540225B1 (de) 2020-10-21

Family

ID=62530370

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19162490.7A Active EP3540225B1 (de) 2018-03-14 2019-03-13 Steuerungsvorrichtung für pumpen

Country Status (3)

Country Link
EP (1) EP3540225B1 (de)
CN (1) CN110273831A (de)
IT (1) IT201800003542A1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1287187B (de) * 1963-07-08 1969-01-16 Hollesens Fabrikker A S H Schwimmschalter fuer Anlagen zur Regelung eines Fluessigkeitsspiegels
DE3610984A1 (de) 1986-04-02 1987-10-08 Blum Albert Vorrichtung zum ein- und ausschalten elektromotorisch angetriebener pumpen
FR2997203A1 (fr) * 2012-10-23 2014-04-25 Robert Antoine Rene Cretaz Regulateurs de niveaux type flotteur avec voyants leds de signal incorpore de bon fonctionnement pour tous travaux et applications hydrauliques et stations de pompages divers
WO2015193784A1 (en) * 2014-06-17 2015-12-23 Xylem Ip Management S.À R.L. Method for shutting off a pump as well as pump station arrangement

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1287187B (de) * 1963-07-08 1969-01-16 Hollesens Fabrikker A S H Schwimmschalter fuer Anlagen zur Regelung eines Fluessigkeitsspiegels
DE3610984A1 (de) 1986-04-02 1987-10-08 Blum Albert Vorrichtung zum ein- und ausschalten elektromotorisch angetriebener pumpen
FR2997203A1 (fr) * 2012-10-23 2014-04-25 Robert Antoine Rene Cretaz Regulateurs de niveaux type flotteur avec voyants leds de signal incorpore de bon fonctionnement pour tous travaux et applications hydrauliques et stations de pompages divers
WO2015193784A1 (en) * 2014-06-17 2015-12-23 Xylem Ip Management S.À R.L. Method for shutting off a pump as well as pump station arrangement

Also Published As

Publication number Publication date
EP3540225B1 (de) 2020-10-21
CN110273831A (zh) 2019-09-24
IT201800003542A1 (it) 2019-09-14

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