EP0554706B1 - Procédé et dispositif pour délivrer un fluide - Google Patents

Procédé et dispositif pour délivrer un fluide Download PDF

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Publication number
EP0554706B1
EP0554706B1 EP93100712A EP93100712A EP0554706B1 EP 0554706 B1 EP0554706 B1 EP 0554706B1 EP 93100712 A EP93100712 A EP 93100712A EP 93100712 A EP93100712 A EP 93100712A EP 0554706 B1 EP0554706 B1 EP 0554706B1
Authority
EP
European Patent Office
Prior art keywords
pump
feed pipe
pipe
fluid
storage container
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 - Lifetime
Application number
EP93100712A
Other languages
German (de)
English (en)
Other versions
EP0554706A1 (fr
Inventor
Helga geb. Altenau Löffeld
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.)
LOEFFELD HELGA GEB ALTENAU
Original Assignee
LOEFFELD HELGA GEB ALTENAU
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Application filed by LOEFFELD HELGA GEB ALTENAU filed Critical LOEFFELD HELGA GEB ALTENAU
Publication of EP0554706A1 publication Critical patent/EP0554706A1/fr
Application granted granted Critical
Publication of EP0554706B1 publication Critical patent/EP0554706B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/06—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations specially adapted for stopping, starting, idling or no-load operation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00—Pumping installations or systems
    • F04B23/02—Pumping installations or systems having reservoirs
    • 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
    • F04D9/004—Priming of not self-priming pumps
    • F04D9/005—Priming of not self-priming pumps by adducting or recycling liquid

Definitions

  • the invention relates to a method and a device for conveying a liquid, such as heating oil EL, from a remote storage tank via a delivery line by means of negative pressure to a storage container, in which the negative pressure is generated by a mechanically operable pump arranged at the end of the delivery line and by an auxiliary line which flows into the delivery line and the pump shortly before the liquid enters, the connection level (end of intake) of which is significantly below a permanent fill level.
  • a liquid such as heating oil EL
  • a method and a device of the type mentioned at the outset is known from US-A 1 461 622.
  • a main pump is arranged above a container filled with a liquid.
  • a suction line is connected to the main pump, which extends into the container and sucks the liquid out. The liquid that is sucked out is removed through the discharge line.
  • an auxiliary line Shortly before the suction line enters the main pump, an auxiliary line, which also projects into the container and in which another pump is arranged, opens into the same.
  • auxiliary line only serves to enable the entire system to start.
  • both pumps start to run. Liquid is sucked in first by the pump arranged in the auxiliary line and is fed to the main pump. After the air from the lines is exhausted, the main pump takes over the function of both pumps.
  • Another disadvantage is that such a form of starting is no longer possible if the flow through the suction line is interrupted by a lack of liquid. In addition, maintaining the lubrication of the pump and maintaining the vacuum is no longer possible.
  • a pump is connected to a storage container which is filled with liquid via a suction line.
  • a valve is arranged in the suction line, which extends to the bottom of the container.
  • a main line leads from the pump to an intermediate container, which is at a certain height above the bottom of the intermediate container is arranged.
  • the liquid conveyed by the pump via the main line is sucked off by a discharge line that reaches the bottom of the intermediate container.
  • a start line is connected to the suction line shortly before it enters the pump.
  • a vent line is also arranged between the bottom of the intermediate container and the pump housing in order to be able to discharge air from the container housing.
  • the start line is only provided for starting the pump.
  • the complex structure and the special control of the valves have the task of pushing the air out of the pump and the pipes, especially the suction pipe. Only when the air on the pump housing and partially out of the suction line blocked by the valve is pushed out can the pump carry out its main operation. If the liquid has reached a certain level in the intermediate container, the pump can be stopped and then started again in an analogous manner.
  • the liquid is conveyed with a negative pressure, which is generated by a jet pump operated by the liquid as a delivery unit, the liquid supply being used
  • Operating the jet pump is the oil supply in the storage tank.
  • a jet pump has a low efficiency and the delivery volume is disproportionately large compared to the actual useful support.
  • large amounts of gas are created which enter the storage container and can lead to faults.
  • This object is achieved in a method of the type mentioned at the outset, which is characterized in that a 0.003-0.1 times the amount of liquid in the delivery line is pumped through the auxiliary line out of the storage container or a separate storage container, with which the flow is interrupted by the delivery line lubricates the pump and the negative pressure is maintained.
  • the advantages achieved by the invention consist in particular in that the liquid conveyed in the auxiliary line is removed from the storage container, to which the liquid conveyed by the pump is also supplied, or an additional storage container is used specifically for the auxiliary line.
  • the auxiliary line also does not require any additional pumps, since the aforementioned pump also takes over the delivery via the auxiliary line.
  • the fluid flow conveyed through the auxiliary line is sufficient to maintain the self-lubrication of conventional mechanical pumps so that they are not destroyed.
  • the oil flow conveyed via the auxiliary line cannot be interrupted either, since it is always returned to the storage tank.
  • Another advantage is that by comparing the pressure ratios and the amounts pumped in time, which can be done for example with the help of vacuum meters and flow meters, the conveyor system can be monitored very easily. A malfunction can be predicted early on by comparing the delivered quantities and the pressures in the lines.
  • the amount of liquid for heating oil that can be supplied via the auxiliary line is set between 0.02 and 0.03 times the amount supplied via the delivery line.
  • Another advantage is that a decrease in the delivery rate at the same vacuum is indicated by the comparison computer as a leak in the delivery line.
  • the device for carrying out the method is characterized in that the auxiliary line has a cross section which is dimensioned with respect to that of the delivery line in such a way that the amount of liquid conveyed through the auxiliary line is 0.003 to 0.1 times that conveyed through the delivery line, and that the auxiliary line is connected to the storage container or a separate storage container, so that for the pump a sufficient amount of liquid for maintaining self-lubrication and the negative pressure can be removed from the storage tank or via the auxiliary line from the storage container or the separate storage container .
  • the delivery line and the auxiliary line are each assigned a vacuum meter and a flow meter, which are connected to a comparison computer.
  • Another advantage is that the ratio of the at the same pressure pumped amount of liquid in (main) delivery line and auxiliary line behaves like 100: 1 to 100: 3.
  • a quantity regulating slide or a similar quantity regulator is preferably installed in the auxiliary line before it opens.
  • Heating oil is conveyed from a distant storage tank 12 via a longer, for example 100 m long delivery line 7.
  • the delivery line can, for example, be laid in the ground.
  • the heating oil reaches a pump 11 which is mechanically driven.
  • the pump is, for example, a gear or screw pump of a known type. It can also be a so-called pump group, as is known per se in conveyor technology. Instead of heating oil, wastewater, solution or the like can also be conveyed, for example.
  • the delivery line 7 Before entering the pump 11, the delivery line 7 can be monitored in terms of the flow rate by means of a flow meter 16.
  • the liquid conveyed by the pump 11 reaches a storage container 1 via the inlet line 6.
  • the storage container has a vent 4. It can be removed from the storage container 1 using an extraction line 3 as required for an oil burner (not shown).
  • the permanent fill level 25 of the storage container 1 is monitored with the aid of a float switch 5. When the liquid level drops below the permanent fill level 25, the float switch 5 switches on the pump 11, which then starts to pump again and is stopped when the float switch has reached a maximum position (shown in broken lines).
  • An essential part of the invention is an auxiliary line 14, which ends with its free end 24 below the permanent fill level in the storage container 1 and is suitable for removing a certain amount of liquid from the storage container.
  • the auxiliary line 14 opens at 15 into the (main) delivery line 7, namely immediately before the delivery line 7 enters the pump 11. It is a simple T-connection, without a special nozzle configuration or the like.
  • a filter 10 and a quantity control slide 9 are installed in the line 14.
  • a flow meter 17 is installed behind the regulating slide 9.
  • the ratio of the cross sections between the two lines 7 and 14 is such that the amount supplied via the auxiliary line is approximately 0.003 to 0.1 times the amount conveyed through the main line 7, in other words, it is at least an order of magnitude lower than that of the main line.
  • the ratio is preferably about 2: 100 to 3: 100.
  • the pump draws in a sufficient amount of the liquid required for self-lubrication via the auxiliary line, so that the lubrication is not interrupted and the vacuum is also maintained.
  • delivery via the delivery line 7 is resumed. Foaming in the area of the pump vane-wall transitions is therefore clearly avoided.
  • a permanent film adapted to the pump output remains in the area of the movable edges within the pump, so that the pump output never breaks down.
  • a comparison computer 19 allows the values for vacuum to be continuously compared by means of the vacuum meters 8 in the delivery line 7 and vacuum meters 18 in the auxiliary line 14 and by the corresponding flow meters 16 and 17. If the smallest leaks occur in the delivery line 7, there is, for example, a decrease in the delivery rate at the same vacuum. This is determined very early by comparing the flow rate, so that countermeasures and monitoring can be initiated at an early stage.
  • the auxiliary line 14 offers a possibility of accepting parameters relevant to the funding there.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Loading And Unloading Of Fuel Tanks Or Ships (AREA)
  • Pipeline Systems (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)

Claims (11)

  1. Procédé pour transporter un liquide, tel que du mazout extra léger, à partir d'une cuve de réserve (12) disposée è distance, par l'intermédiaire d'une conduite de transport (7), par dépression, vers un récipient de stockage (1), procédé dans lequel la dépression est produite par une pompe (11) disposée à l'extrémité de la conduite de transport (7) et du liquide est prélevé au moyen d'une conduite auxiliaire (14) débouchant juste avant l'entrée de la conduite de transport (7) dans la pompe (11).
       caractérisé en ce que
       l'on pompe en permanence, au moyen de la conduite auxiliaire (14), à partir du récipient de stockage (1) ou d'un récipient de stockage séparé, une quantité de liquide comprise entre 0,003 fois et 0,1 fois celle de la conduite de transport (7) et au moyen de laquelle, lors d'une interruption du flux principal, la pompe est graissée et la dépression est maintenue.
  2. Procédé selon la revendication 1, caractérisé en ce que, dans la conduite de transport (7) et dans la conduite auxiliaire (14), on mesure, à chaque fois, la pression au moyen de manomètres à vide (8, 18) et le débit de passage au moyen de débitmètres (16, 17), en ce que, dans un calculateur de comparaison (19), on surveille la conduite de transport (7) au moyen des valeurs mesurées et en ce que l'on régule la quantité de liquide de la conduite auxiliaire (14).
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que la quantité de liquide transportée au moyen de la conduite auxiliaire (14) est réglée, pour du mazout, à une valeur comprlse entre 0,02 fois et 0,03 fois la quantité amenée par la conduite de transport (7).
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'une régression du débit de transport pour une dépression égale est indiquée par le calculateur de comparaison (19) comme étant un défaut d'étanchéité dans la conduite de transport (7).
  5. Dispositif pour transporter un liquide, tel que du mazout extra léger, à partir d'une cuve de réserve (12) disposée à distance, pair l'intermédiaire d'une conduite de transport (7), par dépression, vers un récipient de stockage (1), au moyen d'une pompe (11) disposée à l'extrémité de la conduite de transport (7) et actionnée mécaniquement et au moyen d'une conduite auxiliaire (14) qui pénètre dans la conduite de transport (7) juste avant l'entrée de la conduite de transport (7) dans la pompe (11) et dont le niveau de raccordement (extrémité de réception 24) se trouve fortement au-dessous d'un niveau de remplissage permanent (25)
       caractérisé en ce que
       la conduite auxiliaire (14) présente une section qui, par rapport à la conduite de transport (7), est dimensionnée de telle manière que la quantité de liquide transportée par la conduite auxiliaire (14) a une valeur comprise entre 0,003 fois et 0,01 fois celle transportée par la conduite de transport (7) et en ce que la conduite de transport (7) est reliée au récipient de stockage (1) ou à un récipient de stockage séparé de telle manière que l'on peut prélever, pour la pompe, une quantité de liquide suffisante pour le maintien d'une auto lubrification et de la dépression, aussi bien par l'intermédiaire de la conduite de transport (7) à partir de la cuve de réserve (12) que par l'intermédiaire de la conduite auxiliaire (14) à partir du récipient de stockage (1) ou du récipient de stockage séparé.
  6. Dispositif selon la revendication 5, caractérisé en ce que l'on adjoint, à la fois à la conduite de transport (7) et à la conduite auxiliaire (14) un manomètre à vide (8, 18) et un débitmètre (16, 17) qui sont reliés à un calculateur de comparaison (19).
  7. Dispositif selon la revendication 5 ou 6, caractérisé en ce que le rapport des quantités de liquide transportées, pour une même pression, dans la conduite de transport (7) (principale) et dans la conduite auxiliaire (14) a une valeur comprise entre 100 : 1 et 100 : 3.
  8. Dispositif selon l'une quelconque des revendications 5 à 7, caractérisé en ce qu'une vanne de régulation de débit (9) est incorporée dans la conduite auxiliaire (14) avant son embouchure dans la conduite de transport (7).
  9. Dispositif selon l'une quelconque des revendications précédentes 5 à 8, caractérisé en ce que la conduite auxiliaire (14) fait saillie par une extrémité ouverte dans le récipient de stockage (1).
  10. Dispositif selon l'une quelconque des revendications précédentes 5 à 9, caractérisé en ce qu'une paroi de suppression de bulles (2) perméable aux liquides, verticale et s'étendant jusqu'au niveau de remplissage est disposée dans le récipient de stockage (1) entre l'extrémité d'une conduite d'admission (6) provenant de la pompe et l'extrémité de réception (24) de la conduite auxiliaire (14).
  11. Dispositif selon l'une quelconque des revendications précédentes 5 à 10, caractérisé en ce que la pompe (11) est une pompe à engrenages ou une pompe à vis.
EP93100712A 1992-02-01 1993-01-19 Procédé et dispositif pour délivrer un fluide Expired - Lifetime EP0554706B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4202936A DE4202936C2 (de) 1992-02-01 1992-02-01 Verfahren und Vorrichtung zum Fördern einer Flüssigkeit
DE4202936 1992-02-01

Publications (2)

Publication Number Publication Date
EP0554706A1 EP0554706A1 (fr) 1993-08-11
EP0554706B1 true EP0554706B1 (fr) 1996-04-10

Family

ID=6450801

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93100712A Expired - Lifetime EP0554706B1 (fr) 1992-02-01 1993-01-19 Procédé et dispositif pour délivrer un fluide

Country Status (5)

Country Link
EP (1) EP0554706B1 (fr)
AT (1) ATE136625T1 (fr)
DE (2) DE4202936C2 (fr)
DK (1) DK0554706T3 (fr)
ES (1) ES2086793T3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2239869B1 (es) * 2003-01-16 2006-06-01 Indepro Andalucia, S.L. Grupo electronico de alimentacion de gasoleo atmosferico.

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1461622A (en) * 1921-05-02 1923-07-10 Bour Harry E La Pumping system
US1716982A (en) * 1925-05-16 1929-06-11 Aetna Automatic Oil Burners In Liquid-fuel-feeding apparatus
FR805051A (fr) * 1935-08-01 1936-11-10 Rateau Sa Procédé et dispositifs d'amorçage automatique d'une pompe centrifuge
US2510190A (en) * 1945-06-16 1950-06-06 Arthur P Nicolette Fluid primer and air eliminator
US3276384A (en) * 1964-08-31 1966-10-04 Worthington Corp Check and priming valve means for self-priming pumping system
FR2384709A1 (fr) * 1977-03-25 1978-10-20 Eta Sa Installation pour transvaser du liquide
DE3534723A1 (de) * 1985-09-28 1987-04-16 Simka Ges Fuer Apparatebau Mbh Verfahren und vorrichtung zum foerdern einer fluessigkeit
DD260548A1 (de) * 1987-05-04 1988-09-28 Inst F Getreideverarbeitung Ve Einrichtung zur verhinderung des trockenlaufs von pumpen

Also Published As

Publication number Publication date
DE4202936C2 (de) 1995-11-23
EP0554706A1 (fr) 1993-08-11
ES2086793T3 (es) 1996-07-01
ATE136625T1 (de) 1996-04-15
DK0554706T3 (da) 1996-08-19
DE4202936A1 (de) 1993-08-05
DE59302133D1 (de) 1996-05-15

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