EP0285475A1 - Motorpumpe, insbesondere für Flüssigkeitslieferungsanlagen - Google Patents

Motorpumpe, insbesondere für Flüssigkeitslieferungsanlagen Download PDF

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Publication number
EP0285475A1
EP0285475A1 EP88400503A EP88400503A EP0285475A1 EP 0285475 A1 EP0285475 A1 EP 0285475A1 EP 88400503 A EP88400503 A EP 88400503A EP 88400503 A EP88400503 A EP 88400503A EP 0285475 A1 EP0285475 A1 EP 0285475A1
Authority
EP
European Patent Office
Prior art keywords
pump
pump unit
circuit
membrane
diaphragm
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Withdrawn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
EP88400503A
Other languages
English (en)
French (fr)
Inventor
Christian Mabillot
Roger Amand
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.)
Ets Pompes Guinard Dite Ste
Original Assignee
Ets Pompes Guinard Dite Ste
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 Ets Pompes Guinard Dite Ste filed Critical Ets Pompes Guinard Dite Ste
Publication of EP0285475A1 publication Critical patent/EP0285475A1/de
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B5/00—Use of pumping plants or installations; Layouts thereof
    • 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

Definitions

  • the present invention relates to pump units intended in particular for water or other liquid supply installations.
  • the user of a tap or downstream spray device is deprived of liquid for a certain period of time before each engine start.
  • the invention overcomes these drawbacks by motor-pump unit, in which the exaggerated pressure drop before each start-up is less in both intensity and duration, and in which the decrease in pressure is more spread out after the engine has stopped, which prevents any water hammer.
  • the subject of the invention is therefore a pump unit with switch of the control circuit operated by the displacement of a membrane subjected to the opposing forces of a spring and of the pressure of the liquid in the discharge pipe of the pump and thus displaced, following a first stroke, as long as the pressure of the liquid in the delivery duct remains above a prescribed value, to a position which corresponds to the closing of the circuit and which is reached for said value, characterized in that the membrane is mounted so as to move, when the pressure of the liquid in the discharge line becomes less than said value, beyond the position which corresponds to the closing of the circuit, following a second stroke of length at least equal to one third of that of the first.
  • the length of the second race is at least equal to half that of the first race, and in particular the length of the second race is at least equal to that of the first.
  • the spring is mounted so as to be only partially relaxed when the membrane is in the position which corresponds to the closing of the circuit. It is therefore certain that a certain pressure prevails in the discharge pipe when the membrane is in the closed position of the circuit.
  • the switch comprises a flexible blade which deforms elastically when the membrane passes beyond the position which corresponds to the closing of the circuit.
  • means are provided for moving the diaphragm away from the moving contact of the switch when the diaphragm passes beyond the position corresponding to the closing of the circuit. It is thus certain that the force exerted by the movable contact on the fixed contact of the switch does not reach an intensity such that the switch can be damaged.
  • the separation means comprise a rigid element interposed between a plate secured to the membrane and the movable contact of the switch and provided with abutment faces intended to come into contact with shoulders of the plate fixed to the membrane , the distance between the shoulders of the plate being greater than that between the abutment faces of the element, as well as an auxiliary spring interposed between the movable contact and the element so as to push back the element when the membrane tends to move closer to the mobile contact.
  • the motor control circuit to include a delay device keeping the pump set in operation for a prescribed period after opening. ture of the circuit.
  • the membrane is wedged by its periphery in a housing and the housing is open bottom and is fixed by the bottom directly on the body of the pump, so as to open into the discharge portion thereof.
  • the pump unit shown in Figures 1 to 3 essentially consists of a motor 1 driving a pump 2 wedged on the motor output shaft 3. Water comes from a source, not shown, through the intake pipe of the pump 2 and, after being pressurized by it, is discharged through the discharge pipe 4 to a tap R user.
  • a passage 5 is drilled in the pump body 6.
  • a bottomless housing 7 is bolted to the pump body 6 so as to cover the passage 5.
  • a flexible membrane 8 is wedged by its periphery between the housing 7 and the body pump 6.
  • the diaphragm 8 is integral with a plate 9 slidably mounted by a finger 10 in an opening at the top of the housing 7.
  • the end of a spring 11 is applied to the underside of the top of the housing 7. The another end of this spring 11 pushes the plate 9 radially in the direction of the shaft 3.
  • the plate 9 is extended by a lateral branch 12 having two shoulders 13 and 14.
  • a helical spring 16 of less stiffness than the spring 11.
  • One end of the spring 11 is applied to the top of a cage 17.
  • the top of the cage 17 can come into abutment with the shoulder 14.
  • the bottom of the cage 17 can come into abutment with the shoulder 13.
  • the other end of the spring 16 pushes a movable contact 18 with finger 19 of a switch 20 mounted on the electrical circuit C for controlling the motor 1.
  • a circuit 21 is also mounted on circuit C, by which the pump 2 continues to operate for approximately 20 seconds, after the switch 20 is open.
  • This pump unit operates as follows.
  • valve R is closed.
  • the diaphragm 8 is in the high position, under the effect of the pressure of the water in the discharge duct which prevails over the forces exerted by the spring 11.
  • the branch 12 pushes back, by the shoulder 13, the cage 17 upwards.
  • the spring 16 is relaxed. Finger 19 is pushed up. Switch 20 is open.
  • valve R has just been opened.
  • the pressure in the discharge pipe 4 drops.
  • the spring 11 pushes the membrane 8 down.
  • the branch 12 lowers.
  • the shoulder 14 comes into contact with the top of the cage 17 and drives it down.
  • the movable contact 18 lowers until the finger 19 comes to close the switch 20 in the position shown in Figure 2.
  • the control circuit C makes start engine 1.
  • Pump 2 delivers pressurized water.
  • the volume reserved for water, between the high position of the diaphragm 8 and the position which corresponds to the closing of the circuit represents a reserve of compensation for leakage in the installation which avoids frequent starting of the pump.
  • the pressure in the discharge conduit 4 continues to decrease and the spring 11 continues to lower the membrane 8.
  • the arrangement is such that the membrane 8 can still perform a stroke representing at least one third of that which it has already performed.
  • the branch 12 continues to lower, but the finger 19 pressing on the switch 20 prevents the movable contact 18 from lowering further.
  • the spring 16 compresses.
  • the bottom of the cage 17 leaves the shoulder 13 ( Figure 3).
  • the pump 2 continues to operate for approximately 20 seconds thanks to the timing device 21, after the switch 20 has been opened. This avoids too many starts of pump 2.
  • the diaphragm is mounted so as to move when the pressure of the liquid in the delivery duct becomes lower than a prescribed value, beyond the position which corresponds to the closing of the circuit over a fairly long stroke, safely prevents everything pressure "hole” at valve R, when it opens and any water hammer after it is closed.
  • the branch 12 directly attacks, by its shoulder 14, the flexible blade 22 of the switch 20. It is the flexibility of the blade 22 which makes it possible to protect the switch from any damage when, depending on the Figure 6, the membrane is in the low position.

Landscapes

  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
EP88400503A 1987-03-27 1988-03-03 Motorpumpe, insbesondere für Flüssigkeitslieferungsanlagen Withdrawn EP0285475A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8704275 1987-03-27
FR8704275A FR2612996B1 (fr) 1987-03-27 1987-03-27 Groupe motopompe destine notamment aux installations d'alimentation en liquide

Publications (1)

Publication Number Publication Date
EP0285475A1 true EP0285475A1 (de) 1988-10-05

Family

ID=9349490

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88400503A Withdrawn EP0285475A1 (de) 1987-03-27 1988-03-03 Motorpumpe, insbesondere für Flüssigkeitslieferungsanlagen

Country Status (2)

Country Link
EP (1) EP0285475A1 (de)
FR (1) FR2612996B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0579581A1 (de) * 1992-07-14 1994-01-19 Gianpietro Lenzetti Elektronische Einheit für kontrollierte Abgaben von Desinfektionsflüssigkeiten und dergleichen in Sanitätsapparaten im Allgemeinen
DE10064708A1 (de) * 2000-12-22 2002-07-11 Grundfos As Hauswasserwerk

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1024362B (de) * 1953-06-05 1958-02-13 Vogel Pumpen Verfahren und Einrichtung zur selbsttaetigen Steuerung von Pumpwerken mit kleinem Windkessel
DE1246613B (de) * 1960-10-10 1967-08-03 Odd Fredheim Johnsen Wasserversorgungsanlage
US3376821A (en) * 1966-07-28 1968-04-09 Gen Gas Light Co Liquid supply system and pump control therefor
DE1291292B (de) * 1961-10-06 1969-03-20 Berger Gerard Georges Jean Von einer Motorpumpe gespeiste Wasserversorgungsanlage
DE2219933A1 (de) * 1972-04-22 1973-10-31 Kaercher Fa Alfred Schalteinrichtung an fluessigkeitsstrahlern
DE3337530A1 (de) * 1983-04-12 1984-10-18 MMG Automatika Müvek, Budapest Membranen-kolben-druckschalter mit verstellbarer schalthysteresis

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1024362B (de) * 1953-06-05 1958-02-13 Vogel Pumpen Verfahren und Einrichtung zur selbsttaetigen Steuerung von Pumpwerken mit kleinem Windkessel
DE1246613B (de) * 1960-10-10 1967-08-03 Odd Fredheim Johnsen Wasserversorgungsanlage
DE1291292B (de) * 1961-10-06 1969-03-20 Berger Gerard Georges Jean Von einer Motorpumpe gespeiste Wasserversorgungsanlage
US3376821A (en) * 1966-07-28 1968-04-09 Gen Gas Light Co Liquid supply system and pump control therefor
DE2219933A1 (de) * 1972-04-22 1973-10-31 Kaercher Fa Alfred Schalteinrichtung an fluessigkeitsstrahlern
DE3337530A1 (de) * 1983-04-12 1984-10-18 MMG Automatika Müvek, Budapest Membranen-kolben-druckschalter mit verstellbarer schalthysteresis

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0579581A1 (de) * 1992-07-14 1994-01-19 Gianpietro Lenzetti Elektronische Einheit für kontrollierte Abgaben von Desinfektionsflüssigkeiten und dergleichen in Sanitätsapparaten im Allgemeinen
DE10064708A1 (de) * 2000-12-22 2002-07-11 Grundfos As Hauswasserwerk

Also Published As

Publication number Publication date
FR2612996B1 (fr) 1992-05-15
FR2612996A1 (fr) 1988-09-30

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