DE817078C - Procedure to secure the speed of steam-driven circulation pumps for the pumping of hot water - Google Patents

Procedure to secure the speed of steam-driven circulation pumps for the pumping of hot water

Info

Publication number
DE817078C
DE817078C DE1950H0002730 DEH0002730A DE817078C DE 817078 C DE817078 C DE 817078C DE 1950H0002730 DE1950H0002730 DE 1950H0002730 DE H0002730 A DEH0002730 A DE H0002730A DE 817078 C DE817078 C DE 817078C
Authority
DE
Germany
Prior art keywords
speed
steam
hot water
pumping
procedure
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
DE1950H0002730
Other languages
German (de)
Other versions
DE1614846U (en
Inventor
Eugen Spehr
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.)
Henschel and Sohn GmbH
Original Assignee
Henschel and Sohn GmbH
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 Henschel and Sohn GmbH filed Critical Henschel and Sohn GmbH
Priority to DE1950H0002730 priority Critical patent/DE817078C/en
Application granted granted Critical
Publication of DE817078C publication Critical patent/DE817078C/en
Expired legal-status Critical Current

Links

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
    • 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
    • F04D15/0245—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the pump
    • F04D15/0254—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the pump the condition being speed or load

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Description

Verfahren zur Drehzahlsicherung von dampfgetriebenen Umlaufpumpen für die Förderung von heißem Wasser Bei indirekt beheizten Dampfkesseln wird das heiße Wasser des Primärteils mittels einer Umlaufpumpe durch die Heizschlange gedrückt. Die Förderung von an der Siedegrenze befindlichen Flüssigkeiten stellt bekanntlich an und für sich eine schwierige Aufgabe dar, zumal wenn sie von Dampfturbinen angetrieben werden. In diesem Falle müssen unbedingt sicher wirkende Sicherheitsvorrichtungen vorhanden sein, um eine Überdrehzahl zu verhindern. Ein Durchgehen der Pumpe kann z. B. leicht dadurch ausgelöst werden, daß durch Veränderung der entnommenen Dampfleistung und dem hierbei auftretenden Regelvorgang der Wasserdruck im Primärteil stark absinkt, wodurch ein Aufdampfen des Wassers stattfindet. Auf diese Weise entstehen in der Pumpe selbst auch Dampfblasen, die Leistungsaufnahme der Pumpe fällt stark ab, und bei Beibehaltung der bisherigen Antriebsleistung ginge die Drehzahl hoch. Andererseits besteht für den Kessel eine große Gefahr insofern, als beim Ansprechen der Sicherheitsvorrichtung die Pumpe stillgesetzt wird und dadurch die Feuerleistung auf die Heizrohre des Primärsystems zu deren Zerstörung führt.Procedure for securing the speed of steam-driven circulation pumps for pumping hot water. In the case of indirectly heated steam boilers, this is hot water from the primary part is pressed through the heating coil by means of a circulation pump. It is well known that the pumping of liquids at the boiling point is a problem a difficult task in and of itself, especially when powered by steam turbines will. In this case, safe-acting safety devices are essential be present to prevent overspeed. A runaway pump can occur z. B. can easily be triggered by changing the extracted steam output and the resulting control process, the water pressure in the primary part drops sharply, whereby an evaporation of the water takes place. In this way arise in the Pump also vapor bubbles, the power consumption of the pump drops sharply, and If the previous drive power was retained, the speed would go up. on the other hand there is a great danger for the boiler insofar as the response of the safety device the pump is shut down and thereby the fire output on the heating pipes of the Primary system leads to their destruction.

Diese Mängel und Unsicherheiten werden durch die Erfindung behoben, deren wesentliches Merkmal darin besteht, daß die Umlaufpumpe mit einer Fliehkraftkupplung ausgerüstet ist, die beim Überschreiten der Sicherheitsdrehzahl die Pumpenwelle mit einer gebremsten Welle kuppelt, die so @ bemessen ist, daß sie gegebenenfalls die gesamte Leistung der Antriebsturbine aufzunehmen vermag. Dabei wird zweckmäßig darauf Bedacht genommen, daß zwecks Vermeidung des Pendelns der Kupplung eine hinreichende Überschneidung zwischen Einschalt- und Abschaltdrehzahl stattfindet.These deficiencies and uncertainties are eliminated by the invention, the main feature of which is that the circulation pump has a centrifugal clutch is equipped that the pump shaft when the safety speed is exceeded with a braked shaft that is @ dimensioned so that it possibly able to absorb the entire power of the drive turbine. Included it is advisable to ensure that the Clutch a sufficient overlap between the cut-in and cut-out speed takes place.

Durch die Erfindung wird erreicht, daß beim Aufdampfen der Flüssigkeit in der Pumpe bzw. bei der sich dadurch steigernden Drehzahl von einer gewissen Höhe an eine Kupplung der Pumpe mit der gebremsten Welle,' z. B. Flüssigkeitsbremse, stattfindet, so daß die Dehzahl der Pumpe nicht weiter ansteigen kann. Mit dieser Drehzahl läuft die Pumpe dann so lange weiter, bis nach Aufhören des Aufdampfens wieder der ursprüngliche Leistungsbedarf eintritt; Wobei die Drehzahl absinkt und eine selbsttätige Entkupplung der Pumpe von der Bremswelle eintritt.The invention achieves that when the liquid is evaporated in the pump or at the thereby increasing speed of a certain height to a coupling of the pump with the braked shaft, 'z. B. fluid brake, takes place so that the speed of the pump cannot increase any further. With this Speed, the pump continues to run until after the evaporation has stopped the original power requirement occurs again; Whereby the speed drops and an automatic decoupling of the pump from the brake shaft occurs.

Claims (1)

PATENTANSPRUCH: Verfahren zur Drehzahlsicherung von dampfgetriebenen Umlaufpumpen für die Förderung von heißem Wasser, dadurch gekennzeichnet, daß die Umlaufpumpe mit einer Fliehkraftkupplung ausgerüstet ist, die beim Überschreiten der Sicherheitsdrehzahl die Pumpenwelle mit einer gebremsten Welle kuppelt, die so bemessen ist, daß sie gegebenenfalls die gesamte Leistung der Antriebsturbine aufzunehmen vermag. PATENT CLAIM: Method for speed protection of steam-driven circulating pumps for the promotion of hot water, characterized in that the circulating pump is equipped with a centrifugal clutch which, when the safety speed is exceeded, couples the pump shaft to a braked shaft which is dimensioned so that it can, if necessary, the entire Able to absorb power of the drive turbine.
DE1950H0002730 1950-05-11 1950-05-11 Procedure to secure the speed of steam-driven circulation pumps for the pumping of hot water Expired DE817078C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1950H0002730 DE817078C (en) 1950-05-11 1950-05-11 Procedure to secure the speed of steam-driven circulation pumps for the pumping of hot water

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1950H0002730 DE817078C (en) 1950-05-11 1950-05-11 Procedure to secure the speed of steam-driven circulation pumps for the pumping of hot water

Publications (1)

Publication Number Publication Date
DE817078C true DE817078C (en) 1951-10-15

Family

ID=578751

Family Applications (1)

Application Number Title Priority Date Filing Date
DE1950H0002730 Expired DE817078C (en) 1950-05-11 1950-05-11 Procedure to secure the speed of steam-driven circulation pumps for the pumping of hot water

Country Status (1)

Country Link
DE (1) DE817078C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1626211B1 (en) * 1965-03-26 1970-06-18 Siemens Ag Protective device for boiler feed pumps
EP0060402A1 (en) * 1981-03-07 1982-09-22 BROWN BOVERI REAKTOR GmbH Safety installation for avoiding over-speed of the drive motor of the pump for the primary cooling medium in a water-cooled nuclear reactor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1626211B1 (en) * 1965-03-26 1970-06-18 Siemens Ag Protective device for boiler feed pumps
EP0060402A1 (en) * 1981-03-07 1982-09-22 BROWN BOVERI REAKTOR GmbH Safety installation for avoiding over-speed of the drive motor of the pump for the primary cooling medium in a water-cooled nuclear reactor

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