EP0118403A1 - 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

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Publication number
EP0118403A1
EP0118403A1 EP84850036A EP84850036A EP0118403A1 EP 0118403 A1 EP0118403 A1 EP 0118403A1 EP 84850036 A EP84850036 A EP 84850036A EP 84850036 A EP84850036 A EP 84850036A EP 0118403 A1 EP0118403 A1 EP 0118403A1
Authority
EP
European Patent Office
Prior art keywords
pump
pipe
outlet pipe
receiver
float
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
EP84850036A
Other languages
German (de)
French (fr)
Other versions
EP0118403B1 (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 check valve for controlling the fluid flow from a pump and specifically 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 an outer telescopic pipe axially movable on the first pipe.
  • 6 stands for a float and 7 and 8 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 auomatically adjusted, as the pipe may be moved along the rigid pipe 4.
  • the width of the outlet is maximized as the liquid flows out around the entire periphery of the pipe.
  • control forces are balanced and independant of the water depth of the receiver.
  • the closing time is almost zero.
  • propeller pump a submersible, so-called propeller pump is shown.
  • the invention is however possible to use also in connection with other types of pumps within the scope of the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Check Valves (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Jet Pumps And Other Pumps (AREA)

Abstract

The invention concerns a device which prevents backflow of liquid into a pump unit.
The outlet pipe (4) from a pump (1) is provided with a telescopic extension (5) supported by a float (6) on the surface of the receiver. The static head may then be minimized, independant of the liquid level in the receiver.

Description

  • This invention concerns a check valve for controlling the fluid flow from a pump and specifically a float supported device which controls the pump outlet with reference to the receiver.
  • When pumping of a liquid into a receiver having a changing liquid level, the outlet pipe from the pumps must end on a level which is somewhat higher than the maximum level of the receiver to acertain that the liquid does not flow backwards through the pump when the latter is not working. A disadvantage is that the static head then is higher, sometimes much higher, than the difference between the levels of the pump inlet and the receiver.respectively, thus causing considerable energy losses.
  • Another method is to provide the outlet pipe with a check valve which prevents the liquid from flowing back. Such a 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.
  • The problem to arrange the outlet from a pump at an optimum level is solved by help of a device according to the following claims.
  • The invention is described more closely below with reference to the enclosed drawing.
  • In the drawing 1 stands for a submersible pump unit having an inlet 2 and an outlet 3. 4 stands for the outlet pipe and 5 an outer telescopic pipe axially movable on the first pipe. 6 stands for a float and 7 and 8 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 auomatically adjusted, as the pipe may be moved along the rigid pipe 4.
  • During pumping the downhead force from the pumped liquid lowers the float 6 so that the static head is minimized for each level of the receiver. This means of course also that the energy losses are minimized which is also accentuated by the fact that the liquid flows out around the entire periphery of the pipe.
  • The advantages of the invention are above all the following:
    • 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.
  • No outer controlling means are needed.
  • The control forces are balanced and independant of the water depth of the receiver.
  • All forces from the liquid are taken up radially.
  • The closing time is almost zero.
  • No pressure strokes occur.
  • The energy losses are minimum.
  • In the drawings a submersible, so-called propeller pump is shown. The invention is however possible to use also in connection with other types of pumps within the scope of the invention.

Claims (2)

1 A device for preventing back flow through the outlet pipe of a pump which pipe ends in a receiver for pumped medium, characterized in, that it comprises a telescopically movable pipe (5) on the essentially vertical outlet pipe (4), which pipe (5) is connected to a float (6) which keeps the upper end of the pipe at a suitable height above the liquid level of the receiver.
2 A device according to claim 1, characterized in, that the float (6) is so dimensioned that the force from the outgoing liquid influences on the level of the float such, that the static head, that is the difference between the levels (7) or (7') and (8), is minimized.
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
SE8300797 1983-02-15
SE8300797A SE449897B (en) 1983-02-15 1983-02-15 DEVICE PREVENTION THROUGH THE OUTPUT PIPE OF A PUMP WHICH COINS IN A RECIPIENT CONTAINING PUMP MEDIUM

Publications (2)

Publication Number Publication Date
EP0118403A1 true EP0118403A1 (en) 1984-09-12
EP0118403B1 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 (en)
JP (1) JPS59205075A (en)
DE (1) DE3460283D1 (en)
SE (1) SE449897B (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4320422A1 (en) * 1993-04-08 1994-10-13 Klein Schanzlin & Becker Ag Return flow check device for pump discharge pipes - has pipe outlet above max. fluid level, and bell-shaped hood over it, with edge at min. fluid level
EP0623751A1 (en) * 1993-04-08 1994-11-09 KSB Aktiengesellschaft Pump with back flow hindering device
DE10034174A1 (en) * 2000-07-14 2002-01-24 Ksb Ag pump station
EP2090785A2 (en) * 2008-02-15 2009-08-19 Flux-Geräte GmbH Pumping device
CN103821733A (en) * 2012-11-15 2014-05-28 Abb公司 Method for approximating static head of fluid transfer system
CN111675328A (en) * 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 Energy-saving internal reflux system and using method thereof

Citations (2)

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

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1528665A1 (en) * 1966-07-29 1971-01-21 Ewald Burger Dirty water pump
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 (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4320422A1 (en) * 1993-04-08 1994-10-13 Klein Schanzlin & Becker Ag Return flow check device for pump discharge pipes - has pipe outlet above max. fluid level, and bell-shaped hood over it, with edge at min. fluid level
EP0623751A1 (en) * 1993-04-08 1994-11-09 KSB Aktiengesellschaft Pump with back flow hindering device
DE10034174A1 (en) * 2000-07-14 2002-01-24 Ksb Ag pump station
EP2090785A2 (en) * 2008-02-15 2009-08-19 Flux-Geräte GmbH Pumping device
EP2090785A3 (en) * 2008-02-15 2014-01-01 Flux-Geräte GmbH Pumping device
CN103821733A (en) * 2012-11-15 2014-05-28 Abb公司 Method for approximating static head of fluid transfer system
CN103821733B (en) * 2012-11-15 2016-12-07 Abb技术有限公司 The method and apparatus determining the hydrostatic head of fluid delivery system for approximation
US9568921B2 (en) 2012-11-15 2017-02-14 Abb Technology Oy Method for approximating a static head of a fluid transfer system
CN111675328A (en) * 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 Energy-saving internal reflux system and using method thereof

Also Published As

Publication number Publication date
SE449897B (en) 1987-05-25
JPH0143188B2 (en) 1989-09-19
EP0118403B1 (en) 1986-07-16
SE8300797L (en) 1984-08-16
SE8300797D0 (en) 1983-02-15
DE3460283D1 (en) 1986-08-21
JPS59205075A (en) 1984-11-20

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