EP2310685B1 - Priming device for electric pumps - Google Patents

Priming device for electric pumps Download PDF

Info

Publication number
EP2310685B1
EP2310685B1 EP09804570.1A EP09804570A EP2310685B1 EP 2310685 B1 EP2310685 B1 EP 2310685B1 EP 09804570 A EP09804570 A EP 09804570A EP 2310685 B1 EP2310685 B1 EP 2310685B1
Authority
EP
European Patent Office
Prior art keywords
pump
pump body
liquid
electric
level
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.)
Not-in-force
Application number
EP09804570.1A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2310685A1 (en
Inventor
Francesco Sinico
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.)
DAB Pumps SpA
Original Assignee
DAB Pumps SpA
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 DAB Pumps SpA filed Critical DAB Pumps SpA
Publication of EP2310685A1 publication Critical patent/EP2310685A1/en
Application granted granted Critical
Publication of EP2310685B1 publication Critical patent/EP2310685B1/en
Not-in-force 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
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D9/00—Priming; Preventing vapour lock
    • F04D9/04—Priming; Preventing vapour lock using priming pumps; using booster pumps to prevent vapour-lock
    • F04D9/041—Priming; Preventing vapour lock using priming pumps; using booster pumps to prevent vapour-lock the priming pump having evacuating action
    • F04D9/042—Priming; Preventing vapour lock using priming pumps; using booster pumps to prevent vapour-lock the priming pump having evacuating action and means for rendering its in operative
    • 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

Definitions

  • the present invention relates to a priming device for electric pumps.
  • Electric pumps and in particular centrifugal electric pumps, such as for example self-priming electric pumps, are particularly suitable for the supply of water in domestic systems, small-scale farming, gardening and in general where it is necessary to move liquids.
  • Self-priming is the ability of a pump to draw liquid into the intake duct during the start-up of the pump, if such pump is located under a head.
  • All self-priming pumps are capable of generating a partial vacuum that is sufficient to ensure, during the pumping step, correct operation of the pump.
  • a one-way valve incorporated within the pump body prevents the emptying of the pump body when the pump stops, allowing quick priming when the pump restarts.
  • Such electric centrifugal pumps often have malfunctions due to lack of skill on the part of the user, who fails to fill beforehand, due to forgetfulness or because he is not aware of the correct operation of the electric pump, the pump body with a certain amount of liquid to be pumped.
  • the absence of liquid in the pump body does not allow the occurrence of the turbulence that is needed in order to generate the partial vacuum required to lift the liquid from outside the pump into the inside of the pump body, and substantially the electric pump fails to pump liquid, with dissatisfaction and discontent of the user.
  • priming device for a pump corresponding to the preamble of claim 1 is available from US 3,558,012 .
  • the aim of the present invention is to provide a priming device for electric pumps that can obviate the drawbacks of known types of electric pump.
  • an object of the present invention is to provide a priming device that ensures correct starting of the electric pump with which it is associated even if the pump body is not filled initially by the user.
  • Another object of the present invention is to provide a priming device that does not compromise the performance of the electric pump with which it is associated.
  • Another object of the invention is to provide a priming device that can be applied with equal advantages to centrifugal pumps and electric pumps and also to pumps of other types.
  • Another object of the present invention is to provide a priming device for electric pumps that can be manufactured with known systems and technologies.
  • a priming device for electric pumps according to the present invention, that has the features set forth: in claim 1.
  • a priming device for electric pumps is generally designated by the reference numeral 10.
  • the priming device 10 is shown, by way of example, in Figure 1 fitted on a centrifugal electric pump 11 of the self-priming type, but it must be understood that it can be also fitted on an electric pump of another type.
  • the priming device 10 comprises means for the automatic filling of a pump body 12 at startup with liquid that originates from a same basin 13 from which the electric pump 11 is designed to aspirate in the steady state.
  • the device 10 also comprises an electronic controller 14 for the coordinated management of the power-on and power-off of such automatic filling means and of an electric motor 15 of the electric pump 11, and level sensor means, described in greater detail hereinafter, which are associated with the pump body 12 and are interconnected to the electronic controller 14 in order to detect the level of liquid inside the pump body 12.
  • an electronic controller 14 for the coordinated management of the power-on and power-off of such automatic filling means and of an electric motor 15 of the electric pump 11, and level sensor means, described in greater detail hereinafter, which are associated with the pump body 12 and are interconnected to the electronic controller 14 in order to detect the level of liquid inside the pump body 12.
  • Such automatic filling means are constituted, in the embodiment of the invention described here by way of non-limiting example of the invention, by a vacuum pump 16, which is adapted to draw air from inside the pump body 12 of the electric pump 11 by means of a suction tube 17 and by way of the interposition of an automatic vent 18 of a per se known type, which is fixed to the upper part of the pump body 12.
  • the automatic vent 18 has, inside a cup-shaped body 19 with a lower port 20 to be screwed onto a corresponding collar 21 formed on the pump body 12, a float 22.
  • the float 22 is coupled to a cover 23 for closing the cup-shaped body 19 by means of an arm 24, to which it is pivoted; the arm 24 in turn is pivoted to the cover 23.
  • the arm 24 supports a needle plug 25, which blocks or opens an intake hole 26 formed in the cover 23 and to which the suction tube 17 is connected, according to the rising or descending motion of the float 22.
  • the level sensing means are constituted by a magnet 27, which is integrated within the float 22 and faces a position or displacement sensor 28, for example a Reed bulb, which is arranged outside the cup-shaped body 19 of the vent 18.
  • the movement of the magnet 27 of the float 22 is detected by the displacement sensor 28, which is connected to the controller 14.
  • the electronic controller 14 and the vacuum pump 16 are enclosed in an enclosure 29 that protects them.
  • a check valve 31 which allows the vacuum pump 16 to generate the partial vacuum that is necessary without the risk of drawing air from the delivery duct 30.
  • the operation of the priming device 10 according to the invention is as follows.
  • the electronic controller 14 When first starting the electric pump 11, the electronic controller 14, by means of the position or displacement sensor 28, detects whether the pump body 12 contains liquid to be pumped in a quantity that is sufficient for correct starting.
  • the controller 14 switches on the vacuum pump 16, so that it draws air from a rising duct 32 and from the pump body 12 until it entrains liquid from the basin 13 in such an amount as to fill adequately the pump body 12; in the meantime, the impeller of the electric pump 11 is kept stationary.
  • the sensor magnet 28 moves upward and the electronic controller 14 detects, by means of the sensor 28, whether the correct level of liquid within the pump body 12 has been reached, while at the same time the movement of the arm 24 blocks the hole 26 with the needle plug 25.
  • the controller 14 deactivates the vacuum pump 16 and starts the electric motor 15 to turn the impeller and start actual pumping.
  • FIG. 3 the device 10 according to the invention is shown installed on a horizontal centrifugal electric pump 111.
  • the device 10 according to the invention is shown installed at the upper end of the pump body 212 of a vertical centrifugal electric pump 211, for example of the multistage type.
  • the priming device 10 according to the invention can be applied easily as a kit to pumps and electric pumps of a known type and already in use, as exemplified in Figure 5 .
  • Figure 5 illustrates a generic delivery duct 330, which exits from a pump body and on which, downstream of the check valve, a pipe is coupled for connection to the automatic vent 18, which is connected to the vacuum pump 16 and is interconnected with the electronic controller 14 by interposition of the position or displacement sensor 28.
  • the kit exemplified in Figure 5 is completed by a containment and protection enclosure 333, which contain the various elements of the device 10 and is crossed by the delivery duct 330, which is conveniently surrounded by hermetic sealing rings 334.
  • the present invention provides a priming device for an electric pump that can ensure correct starting of the electric pump with which it is associated, by way of the vacuum pump or other equivalent means, even if the pump body itself is not filled initially by the user.
  • the present invention provides a priming device for an electric pump that does not compromise the performance of the electric pump with which it is associated.
  • the invention provides a priming device for electric pumps which makes the electric pump with which it is associated safe and free from risks of early wear due to incorrect starting while the pump body has no liquid inside it.
  • the invention provides a priming device which, by obviating any distractions and negligence of a user, does not cause discontent in such user, making the pump with which it is associated always operational.
  • the invention provides a priming device which can be applied to electric pumps of the centrifugal type, self-priming or not, but also to other electric pumps which are not centrifugal and are similar and equivalent.
  • the present invention provides a priming device for electric pumps that can be manufactured with known systems and technologies.
  • the materials employed may be any according to requirements and to the state of the art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
EP09804570.1A 2008-08-08 2009-08-05 Priming device for electric pumps Not-in-force EP2310685B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPD2008A000249A IT1391670B1 (it) 2008-08-08 2008-08-08 Dispositivo di adescamento per elettropompe
PCT/EP2009/060142 WO2010015650A1 (en) 2008-08-08 2009-08-05 Priming device for electric pumps

Publications (2)

Publication Number Publication Date
EP2310685A1 EP2310685A1 (en) 2011-04-20
EP2310685B1 true EP2310685B1 (en) 2016-03-30

Family

ID=40740086

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09804570.1A Not-in-force EP2310685B1 (en) 2008-08-08 2009-08-05 Priming device for electric pumps

Country Status (5)

Country Link
EP (1) EP2310685B1 (it)
CN (1) CN102112749A (it)
ES (1) ES2572205T3 (it)
IT (1) IT1391670B1 (it)
WO (1) WO2010015650A1 (it)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2010741C2 (nl) * 2013-05-02 2014-11-04 Rio Boxx Holding B V Universeel pompsysteem.
NL2012135C2 (nl) * 2014-01-24 2015-07-29 Rio Boxx Holding B V Zelfstartend systeem met klep voor een centrifugaalpomp.
KR101707339B1 (ko) * 2015-12-22 2017-02-15 주식회사 일성 진공강자흡식펌프

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1995812A (en) * 1933-04-13 1935-03-26 Pennsylvania Pump & Compressor Pump priming means
US3558012A (en) * 1969-11-06 1971-01-26 Ecodyne Corp Pump station construction
DE2510966A1 (de) * 1975-03-13 1976-09-30 Ahrens & Bode Masch & App Foerdereinrichtung fuer fluessigkeiten, insbesondere fuer pump- und messanlagen zur annahme von milch
US5035583A (en) * 1990-03-21 1991-07-30 Smith & Loveless, Inc. Sewage pump priming system
GB2303178B (en) * 1995-07-07 1999-02-17 Spp Ltd Centrifugal pump priming systems

Also Published As

Publication number Publication date
WO2010015650A1 (en) 2010-02-11
IT1391670B1 (it) 2012-01-17
EP2310685A1 (en) 2011-04-20
CN102112749A (zh) 2011-06-29
ITPD20080249A1 (it) 2010-02-09
ES2572205T3 (es) 2016-05-30

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