EP1775476A1 - Steuervorrichtung für Motorpumpenaggregat - Google Patents

Steuervorrichtung für Motorpumpenaggregat Download PDF

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Publication number
EP1775476A1
EP1775476A1 EP05022404A EP05022404A EP1775476A1 EP 1775476 A1 EP1775476 A1 EP 1775476A1 EP 05022404 A EP05022404 A EP 05022404A EP 05022404 A EP05022404 A EP 05022404A EP 1775476 A1 EP1775476 A1 EP 1775476A1
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EP
European Patent Office
Prior art keywords
hollow body
flow
control
pressure
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.)
Withdrawn
Application number
EP05022404A
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English (en)
French (fr)
Inventor
Alessio Pescaglini
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Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to EP05022404A priority Critical patent/EP1775476A1/de
Publication of EP1775476A1 publication Critical patent/EP1775476A1/de
Withdrawn legal-status Critical Current

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    • 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
    • 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
    • F04D15/0227—Lack of liquid level being detected using a flow transducer

Definitions

  • the present invention relates to the field of hydraulics and, in particular, it relates to an automatic mechanical device suitable for controlling the operation of an electric pump responsive to the flow and to the pressure within the device, which can be fixed to hydraulic installations.
  • a variety of types is used of devices for controlling pressure and flow in a pump, suitable for turning on/off an electric pump, arranged as a hollow body of small size next to the pump and through which the flow passes; however, it has the drawback of being completely assisted by an electronic circuit, in particular for blocking the operation in case of absence of water and for timing the delays of the system.
  • the electronic circuit has a cost that is significant on the final cost of the device; in addition, it is used in places where the relative humidity can be even 90%, with negative effect on its correct operation, notwithstanding it is protected by a resin layer coating.
  • Another feature of the invention is to provide a device capable of working for long also in strongly humid places.
  • Another object is to provide a device capable of starting a hydraulic pump responsive to the flow and to the pressure of the liquid that crosses the pump.
  • a further feature of the present invention is to provide a mechanical control device that has a minimum encumbrance.
  • a control device for an electric pump comprising:
  • the second control body engages the means for turning on/off, since it moves to its intermediate position.
  • the pump continues to work if the flow increases further and reaches a maximum flow rate, where the pressure decreases and said first control body is in said second position. Even said second control body, owing to the high flow, is in said second position and continues to engage the means for turning on/off maintaining the operation of the pump.
  • Such a device is also capable of turning off the pump in case of lack of water; in fact, in case of lack of water said first control body is in said second position and said second control body is in said first position. This way the motor pump is not supplied, since the means for turning on/off are disengaged.
  • said first control body comprises a piston sliding between two positions, said piston having an end connected to an element responsive to the pressure suitable for displacing said piston.
  • said piston comprises a stepped protrusion suitable for operating a body with circular cross section, in particular a sphere, movable perpendicularly to the sliding direction of the piston, said body with circular cross section acting on said means for turning on/off the electric supply to said pump.
  • said body with circular cross section acts on the end of a lever pivotally connected to said device, said lever acting on said means for turning on/off the electric supply to said pump.
  • said means responsive to the pressure comprises a resilient separating membrane arranged between the liquid contained in said hollow body and the outer environment.
  • said membrane is arranged near a wall of said hollow body creating a variable gap between said membrane and said wall, said wall having an opening that allows the liquid to pass from said gap to said hollow body and vice-versa.
  • said opening comprises:
  • said first control body comprises pushing means, in particular a spring, suitable for pushing said control body towards said second position.
  • said first control body comprises a device for adjusting the forces applied by said spring to said piston.
  • said second control body of said means responsive to the flow comprises a stem integral to said second control body, arranged in said hollow body, suitable for engaging with said inlet of said hollow body and interrupting the flow when said second control body is located in said first position, said stem operating a flow control lever arranged out of said hollow body, and that is suitable for acting on said means for turning on/off, thus operating the pump.
  • said second control body comprises a first magnet integral to said body and located at an end opposite to said body with respect to said stem, said magnet being suitable for repelling a second magnet with the same polarity of said first magnet and aligned to said first magnet, said second magnet being arranged out of said hollow body and being suitable for operating a flow control lever that acts on said means for turning on/off, thus operating the pump.
  • a resilient membrane is provided in said hollow body having a portion integral to said second control body, said membrane being suitable for dividing the inner volume of said hollow body into a upper chamber, which is in contact with said means responsive to the flow and the pressure, and a lower chamber, which is in contact with said inlet and said outlet of said hollow body.
  • means are provided for allowing a controlled passage of liquid through said membrane.
  • said upper chamber and said lower chamber are in communication with each other through said means for allowing a controlled passage of liquid comprising:
  • said check valve and said calibrated hole are applied to said flow control membrane.
  • said means for turning on/off the electric supply to said pump comprises an electric button suitable for turning off/on an electric supply circuit.
  • the present invention relates to a control device for an electric pump, where the control comprises means responsive to the pressure and to the flow and is capable of turning on/off the electric supply to said pump according to the demands of pressure and flow.
  • Figures from 1 to 5 represent diagrammatically a cross section of a device according to the invention, respectively in five different steps of its operation.
  • Figure 1 shows diagrammatically the above described control device in a condition at rest and maximum pressure, ready to deliver liquid.
  • This device has a hollow body 19 with an inlet 20 connected to the delivery of an electric pump not shown in the figure and an outlet 21 connected to a liquid consumption point 35 shown with a blocking element 22, for example a hand-wheel tap.
  • the device comprises means responsive to the pressure having a first control body 1 sliding along a direction and operated by a resilient membrane 16, located outside to said hollow body 19 as separation between a liquid present in hollow body 19 and the atmospheric pressure, said liquid reaching said membrane 16 through an opening 18 and creating a variable gap 30.
  • first control body 1 can move between a first position corresponding to a maximum pressure and a second position corresponding to a minimum pressure.
  • FIG. 1 a situation is shown of maximum pressure with the first body 1 in said first position.
  • First control body 1 is pushed against the membrane 16 by a return spring 14, whose compression and then the force applied by the same to the body 1 is adjustable by a screw 15.
  • the control body 1 comprises a stepped protrusion element 7, integral to the body same 1, this element 7 being suitable for operating a sphere 8 movable in a direction perpendicular to the sliding direction of the control body 1, and said sphere 8 operating in turn an elongated element 9 having a protruding tip 10 on a side.
  • This protruding tip 10 according to its position relatively to another protruding tip 11 integral to a lever 12 hinged in a fixed point, can cause lever 12 to rotate up to bringing its free end to operate a switch 13 that blocks the electric supply circuit of the pump.
  • Figure 1 describes the situation of rest at a maximum pressure, when lever 12 does not operate switch 13 and the supply circuit is open so that the pump is not supplied.
  • the device according to the invention comprises also means responsive to the flow having a second control body 2, sliding along the axis of inlet 20 between a first position of absence of flow, where the control body occlude inlet 20, and a second position, where the control body 2 is operated by a flow passing through said inlet.
  • This second control body 2 comprises a flange 6 having O-rings not shown, creating, thus, a check valve that allows only an inlet flow and not an outlet flow.
  • the control body 2 comprises a magnet 3 integral to the body same and connected to the end oriented towards the inside.
  • the above described means responsive to the flow and to the pressure comprise also a lever 5, external to hollow body 19 and hinged in a fixed point, said lever 5 having a magnet 4 with the same polarity of magnet 3 and aligned to magnet 3, in such a way that when magnet 3 is approached to magnet 4, along with the second control body 2, a repelling magnetic force is created that tends to push magnet 4 away in order to operate lever 5 that acts on lever 12, which in turn blocks switch 13 for starting the pump.
  • the second control body comprises a spring 25 suitable for pushing the control body 2 to the closed position. In the situation described the device is to rest at the maximum pressure, so the flow is missing being the pump not supplied.
  • the control device can comprise also mechanical means for timing an hydraulic delay of the pressure and of the flow, not shown in figure but described in figures 6 and 7. They have the object of decelerating the motion of the above described first control body 1 and of the second control body 2, to obtain a graduated variation of the motion of the liquid in the device and then a smooth operation.
  • Figure 2 shows a configuration of the device according to the invention in a point of pressure starter and following pump start in case of low flow rate.
  • the blocking element 22 has been just opened and the liquid starts to flow according to arrow 31, while the pump is still off.
  • the pressure in hollow body 19 starts to decrease causing the control body 1 to approach hollow body 19 and bringing stepped element 7 to an intermediate position.
  • the sphere 8 is approached to the control body 1 and moves element 9 in order to cause the tips 10 and 11 to meet, in order to operate the electric pump.
  • the second control body moves, but not enough to move magnet 4 and the pump is kept turned on only through the pressure.
  • Figure 3 shows a configuration of the device during an operation at normal flow rate, during which the blocking element 22 is partially open.
  • the control is effected by the flow, since the pump is activated by the presence of the flow same.
  • second control body 2 is pushed by the flow towards the inside of hollow body 19, creating a magnetic repelling action on magnet 4 and pushing element 5 up to pushing lever 12, which keeps switch 13 closed and then keeps the pump on.
  • the position of the first control body 1, in this case, is unimportant, since lever 12 is kept pressed against switch 13, whichever position elongated element 9 reaches responsive to the pressure.
  • Figure 4 shows a configuration of the device during the delivery of a liquid at a maximum flow rate.
  • blocking element 20 is completely open, obtaining a minimum resistance against the flow.
  • the pressure in the hollow body in case of high flow rate is low and close to atmospheric pressure, and first blocking element 1 is in its second position, corresponding to a minimum pressure.
  • first blocking element 1 since the flow is high, it pushes second control body 2 towards the inside of hollow body 19, pushing magnet 4 and then closing switch 13 to supply the pump.
  • Figure 5 shows a configuration of the device during a block caused by lack of liquid in the device.
  • first control body 1 is in its second position, because there is not liquid in hollow body 19 and the pressure is atmospheric.
  • the flow through hollow body 19 is zero and then the second control body is in its first position. This way, neither element 5 nor element 9 do operate switch 13, and then the pump remains turned off or it is forced to block.
  • FIGS 6 and 7 show respectively a top plan view and a side cross section of an exemplary embodiment of the device according to the invention.
  • This device comprises a hollow body 63 consisting of an upper shell 40 and a lower shell 41, having an inlet 20 and an outlet 21.
  • On the external surface of upper shell 40 means responsive to the pressure 60 are arranged comprising a first control body 1, for example a piston with axially symmetric shape and hollow inside to house a return spring 14, which is adapted to push said first control body 1 towards the inside of hollow body 63.
  • Said first control body 1 can slide axially between a first position of maximum pressure and a second position of minimum pressure.
  • the control body 1 is operated by the deformation of a membrane 16 located outside of hollow body 63 and have a first surface in contact with the liquid contained in the hollow body and a second surface at atmospheric pressure.
  • the membrane 16 perceives the pressure of the liquid in the hollow body 63 through at least one opening, owing to the liquid passing through between the hollow body 63 and the membrane 16.
  • two apertures are shown engaged by a check valve 52 and by a calibrated hole 53. This way, when the pressure increases an amount of liquid quickly passes through check valve 52, towards the surface of the membrane 16 thus deforming it elastically. When the pressure decreases, this amount moves back hollow body through the calibrated hole 53 in a predetermined time, decelerating the moving back of membrane 16 and then of first control body 1. Thus a hydraulic delay of the pressure is obtained.
  • First control body 1 during its motion between the first and the second position, in a similar way as described for figures 2 and 3, by a stepped protrusion 7 operates a control sphere 8 that in turn operates a lever 9 present on the upper part of first shell 40.
  • Lever 9 has, at its end, a tip 11 capable to operate a tip 10 belonging to a second lever 12 that, by rotating, is capable to operate a switch 13 that starts the pump.
  • the lever 9 has a return spring 46.
  • the device according to the invention comprises means responsive to the flow, having a second control body 2 with function of check valve, sliding along a direction between a first position of zero flow and a second position of maximum flow.
  • the above described second control body 2 which for example has a substantially cylindrical shape and has an sealing 0-ring 46, may have at the lower end at least one cylindrical enlargement 42 with function of reference.
  • it has at the upper end a magnet 3, integral to the body 2 same.
  • a magnet 4 is present, aligned with magnet 3, magnetized with the same polarity of magnet 3 in order to feel a repelling force when magnet 3 is approached to magnet 4.
  • Magnet 4 is connected to a lever 5 that is operated when the magnetic repelling force of magnet 3 passes a threshold value.
  • This lever has an end 62 capable of pushing on the free end of lever 12, thus operating switch 13.
  • the above described means responsive to the flow comprises a resilient membrane 43, having its boundary connected to the plane of separation between the two shells 40 and 41, in order to divide the inner volume of the hollow body into a upper chamber 44 and a lower chamber 45, and the centre integral to the control body 2.
  • a check valve 50 is present that allows the quick passage of an amount of liquid between upper chamber 44 and lower chamber 45 when the control body 2 moves towards the above.
  • membrane 43 has a calibrated hole 51 that allows a back flow of the liquid in a predetermined time, thus creating a deceleration of the back movement of second control body 2 and then a protection from water hammer, in case of quick interruption of the flow.
  • the device according to the invention has a completely mechanical operation, even if it can comprise a standard electronics suitable for an output of data relative to the pump operation and for protection in case of block.
  • the electronics is enormously simpler, at the same time ensuring functions of protection in case of lack of water, starter of pressure, block in case of lack of flow, protection from water hammer and prevention from quick turning on/off of the pump in case of dripping.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
EP05022404A 2005-10-13 2005-10-13 Steuervorrichtung für Motorpumpenaggregat Withdrawn EP1775476A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05022404A EP1775476A1 (de) 2005-10-13 2005-10-13 Steuervorrichtung für Motorpumpenaggregat

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05022404A EP1775476A1 (de) 2005-10-13 2005-10-13 Steuervorrichtung für Motorpumpenaggregat

Publications (1)

Publication Number Publication Date
EP1775476A1 true EP1775476A1 (de) 2007-04-18

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EP05022404A Withdrawn EP1775476A1 (de) 2005-10-13 2005-10-13 Steuervorrichtung für Motorpumpenaggregat

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2584109A1 (de) * 2011-10-19 2013-04-24 Grundfos Holding A/S Füllstandsensor
CN103629096A (zh) * 2013-05-23 2014-03-12 南车青岛四方机车车辆股份有限公司 水泵自动控制装置
EP2990653A1 (de) * 2014-08-29 2016-03-02 Pedrollo S.p.a. Vorrichtung zur steuerung des startens und stoppens eines elektromotors einer motorgetriebenen pumpe
CN105386967A (zh) * 2015-12-12 2016-03-09 李正明 智能一体开关

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0459434A2 (de) * 1990-06-01 1991-12-04 Osvaldo Valdes Hydropneumatische Druck-Regeleinrichtung zur Betriebssteuerung von elektrischen Motorpumpen
EP0528726A1 (de) * 1991-08-16 1993-02-24 POMPES SALMSON Société Anonyme à directoire dite: Verfahren und Vorrichtung zur Steuerung einer Pumpen-Anlage und Nachweiselement für eine derartige Anlage
EP0663553A1 (de) * 1994-01-14 1995-07-19 CO.GE.PO. S.r.l. Wasserversorgungssystem
EP0819851A2 (de) * 1996-07-19 1998-01-21 GARDENA Kress + Kastner GmbH Steuereinrichtung für eine Förderpumpe oder dlg.
EP1074745A1 (de) * 1999-08-06 2001-02-07 Eng & Mark s.r.l. Hydraulische Maschine versehen mit automatischer Steuereinrichtung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0459434A2 (de) * 1990-06-01 1991-12-04 Osvaldo Valdes Hydropneumatische Druck-Regeleinrichtung zur Betriebssteuerung von elektrischen Motorpumpen
EP0528726A1 (de) * 1991-08-16 1993-02-24 POMPES SALMSON Société Anonyme à directoire dite: Verfahren und Vorrichtung zur Steuerung einer Pumpen-Anlage und Nachweiselement für eine derartige Anlage
EP0663553A1 (de) * 1994-01-14 1995-07-19 CO.GE.PO. S.r.l. Wasserversorgungssystem
EP0819851A2 (de) * 1996-07-19 1998-01-21 GARDENA Kress + Kastner GmbH Steuereinrichtung für eine Förderpumpe oder dlg.
EP1074745A1 (de) * 1999-08-06 2001-02-07 Eng & Mark s.r.l. Hydraulische Maschine versehen mit automatischer Steuereinrichtung

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2584109A1 (de) * 2011-10-19 2013-04-24 Grundfos Holding A/S Füllstandsensor
CN103629096A (zh) * 2013-05-23 2014-03-12 南车青岛四方机车车辆股份有限公司 水泵自动控制装置
CN103629096B (zh) * 2013-05-23 2016-09-07 中车青岛四方机车车辆股份有限公司 水泵自动控制装置
EP2990653A1 (de) * 2014-08-29 2016-03-02 Pedrollo S.p.a. Vorrichtung zur steuerung des startens und stoppens eines elektromotors einer motorgetriebenen pumpe
CN105386967A (zh) * 2015-12-12 2016-03-09 李正明 智能一体开关
CN105386967B (zh) * 2015-12-12 2017-04-12 李正明 智能一体开关

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