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WO1995031698A1 - Procede de determination du niveau dans une citerne a bord d'un vehicule de pompage des boues - Google Patents

Procede de determination du niveau dans une citerne a bord d'un vehicule de pompage des boues Download PDF

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Publication number
WO1995031698A1
WO1995031698A1 PCT/EP1995/001852 EP9501852W WO9531698A1 WO 1995031698 A1 WO1995031698 A1 WO 1995031698A1 EP 9501852 W EP9501852 W EP 9501852W WO 9531698 A1 WO9531698 A1 WO 9531698A1
Authority
WO
WIPO (PCT)
Prior art keywords
air
tank
pressure
volume
suction pressure
Prior art date
Application number
PCT/EP1995/001852
Other languages
German (de)
English (en)
Inventor
Georg Sandkühler
Original Assignee
Ottomeyer Gmbh & Co. Kg
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 Ottomeyer Gmbh & Co. Kg filed Critical Ottomeyer Gmbh & Co. Kg
Publication of WO1995031698A1 publication Critical patent/WO1995031698A1/fr

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F7/00—Other installations or implements for operating sewer systems, e.g. for preventing or indicating stoppage; Emptying cesspools
    • E03F7/10—Wheeled apparatus for emptying sewers or cesspools
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/14—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measurement of pressure

Definitions

  • the invention relates to a method for determining the level in the suction pressure tank of a sludge suction vehicle with a vacuum pump that can be connected to the suction pressure tank and / or an air pressure pump.
  • the fill level in the suction pressure tank of a sludge suction vehicle could also be determined by means of a flow meter, but precise measured values can only be determined here with homogeneous liquids. Considerable measurement errors can occur with sludges of different consistency, especially since air bubbles are carried along.
  • a measuring method requires a defined position of the suction pressure tank, which in practice can only be achieved with complex measures in a sludge suction vehicle, for example by bringing the vehicle into a horizontal position by means of hydraulic rams.
  • the invention is based on the idea of measuring the free residual volume, ie the empty volume not filled with sludge, in the suction pressure tank instead of the sludge volume present in the suction pressure tank. If this empty volume is subtracted from the known total volume of the suction pressure tank, the respective sludge filling volume in the suction pressure tank is obtained.
  • the invention is therefore based on the object of providing a method of the type mentioned at the beginning, in which, using the facilities which are present anyway on a sludge suction vehicle, the respective free residual volume in the suction pressure tank can be determined in a simple manner and the relevant filling volume can then be determined.
  • the completed suction pressure tank is evacuated to a predetermined negative pressure or placed under a predetermined air pressure, after which an air exchange takes place with the atmosphere or with a reference container under a different initial air pressure.
  • the free remaining volume in the suction pressure tank is then determined from the exchanged air volume and / or the air pressure which arises after the air exchange and the respective filling volume is determined from the difference to the known total volume of the suction pressure tank.
  • the free residual volume in the suction pressure tank can easily be determined with a simple measurement of air volume or pressure, even if certain physical requirements after thermodynamics have to be taken into account. Corresponding parameters can be taken into account when calculating the free residual volume in the suction pressure tank.
  • the respective air pressures in the suction pressure container or in the reference container can be selected so that the air behaves approximately like an ideal gas.
  • the pressure compensation process can be set up in such a way that it is largely an isothermal change in the state of the air.
  • appropriate correction values can be determined by temperature measurements before and / or after the pressure compensation.
  • air is admitted into the suction pressure tank from a closed air boiler as a reference container according to the method of the invention, the volume of which is many times smaller than that of the suction pressure tank.
  • the pressure adjusting pressure either in the Saugdruck ⁇ tank or in the air tank, the free residual volume in the Saug ⁇ pressure tank.
  • the outlet pressure of the air in the air boiler is above the atmospheric air pressure, for example at about 8 bar.
  • the suction pressure tank is evacuated, the negative air pressure in the suction pressure tank is about 0.5 bar.
  • the free residual volume V in the suction pressure tank of the mud vehicle can be calculated using the following formula:
  • V the volume of the air tank
  • V the volume of the pipes between the
  • the drawing shows a measurement scheme for the level determination in the suction pressure tank of a mud suction vehicle.
  • the drawing shows a suction pressure tank 1, as is usually used on a mud suction vehicle.
  • the lower area 2 of the suction pressure tank 1 is filled with sludge, and above it is an empty area 3, which represents the free residual volume of the suction pressure tank 1 that is still available.
  • a vacuum system 4 can be connected to the suction pressure tank 1 via a line 5, which is already present on a sludge suction vehicle for the sludge absorption.
  • the closed suction pressure tank 1 can be evacuated to a certain negative air pressure via the vacuum system 4, a practical value here being 0.5 bar.
  • an air supply device 6 which can be connected to an air boiler 8 via a line 7.
  • the air tank 8 has a volume many times smaller than the suction pressure tank 1, with a usual volume of the suction pressure tank 1 of about 12 m, the air tank 8 has a volume of 120 1.
  • the volume of the air tank 8 is about 1%. of the volume of the suction pressure tank should be 1. about the air supply device 6, the air tank 8 is inflated to an excess pressure of approximately 8 bar.
  • the air tank 8 is connected to the suction pressure tank 1 via a pressure compensation line 9, this line is opened with each measurement process as soon as the predetermined negative air pressure prevails in the suction pressure tank 1 and the predetermined air pressure prevails in the air tank 8. It goes without saying that the suction pressure tank 1 and the air tank 8 are closed when the pressure equalization is to be carried out and are only connected to one another via the pressure equalization line 9.
  • the pressure and temperature values of the suction pressure tank 1 are fed to a computer 14 via lines 12 and 13 via a temperature sensor 10 and a pressure sensor 11 in the form of electrical signals.
  • the air tank 8 is equipped with a temperature sensor 15 and a pressure sensor 16, which are also connected to the computer 14 via lines 17 and 18.
  • the computer 14 calculates the respective filling volume V in the lower area 2 of the suction pressure tank 1 according to a predetermined program by the remaining free volume in the upper area 3 of the suction pressure tank 1 determined and subtracted from the known total volume of the suction pressure tank 1.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Sewage (AREA)

Abstract

Procédé de détermination du niveau dans une citerne à aspiration et pression à bord d'un véhicule de pompage des boues, comprenant une pompe à vide et/ou une pompe à air comprimé pouvant être raccordée à la citerne, caractérisé en ce que, pour réaliser chaque mesure, on fait le vide dans la citerne fermée, jusqu'à obtention d'une dépression donnée, ou bien on établit une surpression d'air prédéterminée, puis on effectue un échange d'air avec l'atmosphère ou avec un récipient de référence sous une pression d'air comprimé initiale différente, et en ce qu'à partir du volume d'air échangé et/ou de la pression d'air qui s'est établie après l'échange d'air, on trouve le volume libre restant dans la citerne et, à partir de la différence par rapport au volume total connu de la citerne, on détermine le volume correspondant de remplissage.
PCT/EP1995/001852 1994-05-18 1995-05-16 Procede de determination du niveau dans une citerne a bord d'un vehicule de pompage des boues WO1995031698A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4417399.7 1994-05-18
DE19944417399 DE4417399C1 (de) 1994-05-18 1994-05-18 Verfahren zur Füllstandsbestimmung bei Schlammsaugfahrzeugen

Publications (1)

Publication Number Publication Date
WO1995031698A1 true WO1995031698A1 (fr) 1995-11-23

Family

ID=6518379

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1995/001852 WO1995031698A1 (fr) 1994-05-18 1995-05-16 Procede de determination du niveau dans une citerne a bord d'un vehicule de pompage des boues

Country Status (2)

Country Link
DE (1) DE4417399C1 (fr)
WO (1) WO1995031698A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19706868C2 (de) * 1996-03-14 1999-06-17 Guenter Kueller Fahrzeugbau Fa Einrichtung zur Erfassung der Position einer stufenlos verschiebbaren Zwischenwand im Behälter von Tankwagen
DE10145815B4 (de) * 2001-09-17 2004-10-21 Müller Umwelttechnik GmbH & Co. KG Entsorgungsfahrzeug
WO2004104524A2 (fr) * 2003-05-21 2004-12-02 Girardello, Gianpaolo Procede de mesure d'un volume libre d'un reservoir et dispositif de mesure fonctionnant selon ce procede

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2737069A1 (de) * 1977-08-17 1979-03-01 Siegfried Brueckl Verfahren zur echtmessung von behaelter-fuellvolumen
FR2510750A1 (fr) * 1981-07-31 1983-02-04 Frigofrance Sa Procede et dispositif de controle et d'ajustement d'une quantite de liquide contenue dans un reservoir
FR2646238A1 (fr) * 1989-04-20 1990-10-26 Peugeot Systeme de jaugeage par pressurisation pour reservoir carburant

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1858295U (de) * 1962-07-11 1962-09-06 Keller & Knappich Gmbh Vorrichtung an faekalien- und schlammsaugewagen.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2737069A1 (de) * 1977-08-17 1979-03-01 Siegfried Brueckl Verfahren zur echtmessung von behaelter-fuellvolumen
FR2510750A1 (fr) * 1981-07-31 1983-02-04 Frigofrance Sa Procede et dispositif de controle et d'ajustement d'une quantite de liquide contenue dans un reservoir
FR2646238A1 (fr) * 1989-04-20 1990-10-26 Peugeot Systeme de jaugeage par pressurisation pour reservoir carburant

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
"ESTIMATING LIQUID AND GAS CONTENTS IN A TANK", NTIS TECH NOTES, 1 September 1991 (1991-09-01), pages 727, XP000264082 *
C.O. LEE, E.A.: "SIMPLE METHOD FOR DETERMINING THE INTERNAL VOLUME OF A VACUUM SYSTEM", JOURNAL OF VACUUM SCIENCE AND TECHNOLOGY, vol. 13, no. 5, NEW YORK, US, pages 1108 - 1109 *
WATANABE K ET AL: "VOLUME MEASUREMENT OF DEFORMED MATERIALS IN TANKS", ISA TRANSACTIONS, vol. 27, no. 4, 1 January 1988 (1988-01-01), pages 9 - 19, XP000111169 *

Also Published As

Publication number Publication date
DE4417399C1 (de) 1995-06-22

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