EP0118403B1 - Back flow preventing device in the outlet pipe of a pump - Google Patents

Back flow preventing device in the outlet pipe of a pump Download PDF

Info

Publication number
EP0118403B1
EP0118403B1 EP19840850036 EP84850036A EP0118403B1 EP 0118403 B1 EP0118403 B1 EP 0118403B1 EP 19840850036 EP19840850036 EP 19840850036 EP 84850036 A EP84850036 A EP 84850036A EP 0118403 B1 EP0118403 B1 EP 0118403B1
Authority
EP
European Patent Office
Prior art keywords
pipe
pump
outlet pipe
receiver
back flow
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.)
Expired
Application number
EP19840850036
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0118403A1 (en
Inventor
Roland Svensson
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.)
Xylem Water Solutions AB
Original Assignee
Flygt AB
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 Flygt AB filed Critical Flygt AB
Publication of EP0118403A1 publication Critical patent/EP0118403A1/en
Application granted granted Critical
Publication of EP0118403B1 publication Critical patent/EP0118403B1/en
Expired legal-status Critical Current

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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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/406—Casings; Connections of working fluid 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
    • 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
    • F04D13/066—Floating-units
    • 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

  • This invention concerns a float supported device which controls the pump outlet with reference to the receiver.
  • Another method is to provide the outlet pipe with a check valve which prevents the liquid from flowing back.
  • a check valve is however very sensitive to strokes and also demands an essentially horizontal outlet pipe having additional tube losses.
  • a third possibility is to arrange the outlet pipe bent in such a way, that its upper part always is above the liquid level in the receiver, a so-called siphon.
  • Such a device has however considerable losses and in addition there may be problems at pump start if the liquid level in the receiver goes below the outlet of the siphon.
  • FIG. 1 stands for a submersible pump unit having an inlet 2 and an outlet 3.
  • 4 stands for the outlet pipe and 5 for an outer telescopic pipe axially movable on the first pipe.
  • 6 stands for a float and 7 and 8 for different liquid levels.
  • the submersible pump unit 1 transports the liquid through the pipes 4 and 5.
  • the buoyancy of the float 6 is so chosen, that the upper end of the pipe 5 is at a suitable height above the surface 7 to prevent backflow when no pumping takes place. If the liquid level changes (7'), the end of the pipe 5 is automatically adjusted, as the pipe may be moved along the rigid pipe 4.
  • the static head that is the distance between the levels 7 (7') and 8, is always minimized.
  • the width of the outlet is maximized as the liquid flows out around the entire periphery of the pipe.
  • control forces are balanced and indepen- dant of the water depth of the receiver.
  • the closing time is almost zero.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Check Valves (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Jet Pumps And Other Pumps (AREA)
EP19840850036 1983-02-15 1984-02-02 Back flow preventing device in the outlet pipe of a pump Expired EP0118403B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8300797A SE449897B (sv) 1983-02-15 1983-02-15 Anordning for forhindrande av aterstromning genom utloppsroret till en pump vilket mynnar i en recipient innehallande pumpat medium
SE8300797 1983-02-15

Publications (2)

Publication Number Publication Date
EP0118403A1 EP0118403A1 (en) 1984-09-12
EP0118403B1 true EP0118403B1 (en) 1986-07-16

Family

ID=20350038

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840850036 Expired EP0118403B1 (en) 1983-02-15 1984-02-02 Back flow preventing device in the outlet pipe of a pump

Country Status (4)

Country Link
EP (1) EP0118403B1 (enrdf_load_stackoverflow)
JP (1) JPS59205075A (enrdf_load_stackoverflow)
DE (1) DE3460283D1 (enrdf_load_stackoverflow)
SE (1) SE449897B (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5520510A (en) * 1993-04-08 1996-05-28 Ksb Aktiengesellschaft Mechanism for preventing back-flow for pump discharge pipes
US6681801B2 (en) 2000-07-14 2004-01-27 Ksb Aktiengesellschaft Pumping station with efficiency increasing and backflow preventing structure

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4320422A1 (de) * 1993-04-08 1994-10-13 Klein Schanzlin & Becker Ag Rückflußverhinderer für Pumpenauslaufrohre
DE102008010360B4 (de) * 2008-02-15 2020-02-27 Flux-Geräte GmbH Pumpeneinrichtung
EP2733358A1 (en) 2012-11-15 2014-05-21 ABB Oy Method for approximating the static head downstream of a pump
CN111675328A (zh) * 2020-06-01 2020-09-18 上海市城市建设设计研究总院（集团）有限公司 节能型内回流系统及其使用方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1528665A1 (de) * 1966-07-29 1971-01-21 Ewald Burger Schmutzwasserpumpe
US4030859A (en) * 1975-09-02 1977-06-21 Lake Aid Inc. Floating aerator having means to vary the length of the draft pipe

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5520510A (en) * 1993-04-08 1996-05-28 Ksb Aktiengesellschaft Mechanism for preventing back-flow for pump discharge pipes
US6681801B2 (en) 2000-07-14 2004-01-27 Ksb Aktiengesellschaft Pumping station with efficiency increasing and backflow preventing structure

Also Published As

Publication number Publication date
EP0118403A1 (en) 1984-09-12
SE8300797L (sv) 1984-08-16
SE449897B (sv) 1987-05-25
JPS59205075A (ja) 1984-11-20
SE8300797D0 (sv) 1983-02-15
DE3460283D1 (en) 1986-08-21
JPH0143188B2 (enrdf_load_stackoverflow) 1989-09-19

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