US3517687A - Method and device for the oscillation-free operation of a rotary pump - Google Patents

Method and device for the oscillation-free operation of a rotary pump Download PDF

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Publication number
US3517687A
US3517687A US3517687DA US3517687A US 3517687 A US3517687 A US 3517687A US 3517687D A US3517687D A US 3517687DA US 3517687 A US3517687 A US 3517687A
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US
United States
Prior art keywords
pump
discharge
cone
pressure
valve
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
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English (en)
Inventor
Gunter Oskar Nordt
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.)
H SCHROEDER AND CO
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H SCHROEDER AND CO
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.)
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Publication date
Application filed by H SCHROEDER AND CO filed Critical H SCHROEDER AND CO
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Publication of US3517687A publication Critical patent/US3517687A/en
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
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
    • F04D15/0011—Control, e.g. regulation, of pumps, pumping installations or systems by using valves by-pass valves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2496—Self-proportioning or correlating systems
    • Y10T137/2559—Self-controlled branched flow systems
    • Y10T137/2574—Bypass or relief controlled by main line fluid condition
    • Y10T137/2579—Flow rate responsive
    • Y10T137/2587—Bypass or relief valve biased open
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2496—Self-proportioning or correlating systems
    • Y10T137/2559—Self-controlled branched flow systems
    • Y10T137/2574—Bypass or relief controlled by main line fluid condition
    • Y10T137/2579—Flow rate responsive
    • Y10T137/2602—Flapper

Definitions

  • a valve device for stabilizing discharge from a pump comprises a discharge throttling cone which throttling cone actuates an auxiliary by-pass relief valve member.
  • the object of this invention is to operate a rotary pump in an oscillation-free manner even in the unstable portion of the discharge pressure characteristic curve.
  • Another object of the invention is to provide a method to effectively obviate the propagations of oscillations by separating the pump from the source of oscillations.
  • a further object of this invention is to provide a device for maintaining a pressure drop from the pump to the elastic tubular line which acts as a storage member for oscillations. This results in the holding of the pressure of the fluid intended for the said tubular line to be held near the starting pressure of the pump to obtain a damping effect.
  • Another object of this invention is to maintain the pressure of the fluid intended for the tubular line acting as a storage member below the starting pressure of the pump when the pump is operating in the unstable region.
  • This method of pressure control completely removes the possibility of discharge fluid from flowing back to the pump.
  • Another feature of the invention is to provide a throttling of the fluid flow as a function of the pump feed rate. This throttling step takes place between the pump and the oscillable storage member in such a way that the maximum throttling lies in the unstable zone of the characteristic curve and the minimum throttling lies in the stable zone of the characteristic curve.
  • a still further object of this invention is to provide a degree of throttling in the unstable zone of the characteristic curve that is large enough for the pressure behind the valve to be below the pump starting pressure.
  • the method of the invention is preferably effected with a by-pass relief valve disposed beyond the pump. In this way a minimum feed quantity within a predetermined range is automatically drawn off.
  • the by-pass relief valve of this invention includes an inlet, a main outlet and an auxiliary outlet.
  • a stepped cone structure is provided in the main outlet region and operates in conjunction with an inlet cone structure and a slider controlling means for the auxiliary outlet.
  • the use of the main inlet cone provides a drop in pressure over the whole discharge range from the minimum rate to a predetermined peak rate value so that the pump starting pressure is not exceeded inthe oscillations storage mass. This pressure drop provided by the use of the main inlet cone completely prevents the pump starting pressure from being reached in the oscillations storage mass.
  • FIG. 1 shows graphically a comparison of discharge pressure characteristic curves for a rotary pump having an unstable characteristic and provides a discharge procedure disclosed in accordance with this invention
  • FIG. 2 shows graphically the throttling curve in relation to the pump discharge rate on applying the method of the disclosed invention
  • FIG. 3 shows a longitudinal section of a by-pass relief valve for carrying out the method of the disclosed invention.
  • a discharge characteristic curve A is obtained in a system including a rotary pump of unstable characteristic and an elastic member in the discharge line.
  • This discharge characteristic curve A shows that when the discharge is reversed on exceeding the peak point e, the characteristic curve B takes shape.
  • the ordinates indicate the pressure head H while the discharge rate Q is shown along the abscissa.
  • the said reversal means that the fluid already discharged is forced back into the pump.
  • the oscillating storage member then gives up its energy in the form of a pressure reduction, and the pump begins to discharge again at its own starting pressure I-I on the stable branch A of the QH curve.
  • the possibility of the discharge direction reversing is overcome by reducing pressure to H over the whole discharge range from the minimum rate to a peak point e. This pressure reduction is such that the pump starting pressure cannot be ex ceeded and cannot be reached in the storage member.
  • a by-pass relief valve as shown in FIG. 3 is disposed beyond the pump for providing the feature of the instant invention.
  • the valve includes housing members 1 and 2 wherein a stepped cone 3 having diameters D and D is movably mounted in supports 4 and 5.
  • the stepped cone 3 is pressed against housing seat 1a by its own weight and the force of a spring 6.
  • the spring 6 which abuts both against support and the cone 3 moves through a distance it.
  • Another cone structure 17 having a diameter d is located in the valve inlet 16.
  • the cone structure 17 is connected to stepped cone 3 and is simultaneously movable up and down therewith.
  • the valve structure further includes an auxiliary outlet 15 controlled by a rotary slider 7 located in housing memher 8.
  • the slider 7 is linked to cone 3 by Way of a lever 9.
  • Parallel nozzel-like apertures 7a through which the pressure of the discharged water can be greatly reduced are located in the rotary slider 7.
  • the housing apertures 8a cooperate with and are of a greater diameter than the nozzle-like apertures 7a. The smallest diameter of the housing apertures 8a should exceed the smallest diameter of nozzle-like apertures 7a.
  • the arrangement and constuction of the individual throttle points as explained above mean that the maximum pressure drop lies in the unstable area and the minimum pressure drop in the stable area of the QH curves.
  • a valve device for providing oscillation-free operation of a rotary pump which discharges into a line and has an unstable discharge pressure characteristic comprising, in combination,
  • valve cone means movably mounting a valve cone within a housing having an inlet opening for connection to said pump discharge, an outlet opening for connection to said line and an auxiliary discharge outlet located between said inlet and outlet openings,
  • valve cone including a return cone portion having a first throttling means to act on the flow of liquid through the device while said unstable line conditions exist
  • valve cone carrying a second throttling means located at the inlet opening, said second throttling means always allows a quantity of liquid through the inlet opening,

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Check Valves (AREA)
US3517687D 1967-06-01 1968-05-29 Method and device for the oscillation-free operation of a rotary pump Expired - Lifetime US3517687A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1653778A DE1653778C3 (de) 1967-06-01 1967-06-01 Freilaufrückschlagventil für Kreiselpumpen, insbesondere für Kesselspeisepumpen

Publications (1)

Publication Number Publication Date
US3517687A true US3517687A (en) 1970-06-30

Family

ID=7435874

Family Applications (1)

Application Number Title Priority Date Filing Date
US3517687D Expired - Lifetime US3517687A (en) 1967-06-01 1968-05-29 Method and device for the oscillation-free operation of a rotary pump

Country Status (5)

Country Link
US (1) US3517687A (enrdf_load_stackoverflow)
AT (1) AT279370B (enrdf_load_stackoverflow)
DE (1) DE1653778C3 (enrdf_load_stackoverflow)
FR (1) FR1605355A (enrdf_load_stackoverflow)
GB (1) GB1228919A (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0275247B1 (en) * 1987-01-16 1991-10-09 Fisher Controls International, Inc. Taper key joint for connecting a rotary valve shaft to a valve disc
US20100206391A1 (en) * 2007-03-30 2010-08-19 Tyco Valves & Controls, Inc. Adjustable recirculating valve
US20110000556A1 (en) * 2009-07-06 2011-01-06 Rainer Klemm Non-return valve having improved automatic recirculation
CN104565453A (zh) * 2013-10-28 2015-04-29 北京航天动力研究所 旁通结构为转阀的自控回流阀
CN105626551A (zh) * 2016-03-04 2016-06-01 中国五环工程有限公司 一种旋转阀式泵保护装置
WO2021008899A1 (de) * 2019-07-12 2021-01-21 KSB SE & Co. KGaA Ventil
WO2021008903A1 (de) * 2019-07-12 2021-01-21 KSB SE & Co. KGaA Armaturanordnung

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5075432U (enrdf_load_stackoverflow) * 1973-11-14 1975-07-01
CA1104461A (en) * 1980-02-01 1981-07-07 Heinz K. Hetz Modulating flow control valve assembly
US5333638A (en) * 1993-01-21 1994-08-02 Keystone International Holdings Corp. Automatic recirculation valve

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH204955A (de) * 1938-02-02 1939-05-31 Sulzer Ag Auf der Druckseite von Kreiselpumpen, insbesondere Kesselspeisepumpen, angeordnetes Rückschlagorgan.
FR1066887A (fr) * 1951-07-31 1954-06-10 Shell Refining & Marketing Co Perfectionnements aux appareils distributeurs de liquides
DE1108992B (de) * 1958-06-06 1961-06-15 Gerdts Gustav F Kg Verfahren zur Sicherstellung des Durchflusses einer Mindestmenge
GB893102A (en) * 1958-12-19 1962-04-04 G & J Weir Ltd System for controlling the flow of byepass liquid from a centrifugal pump
US3318321A (en) * 1964-08-29 1967-05-09 Odendahl Wilhelm Minimum amount control for centrifugal type boiler feed pumps
US3349714A (en) * 1965-10-11 1967-10-31 Ford Motor Co Power steering pump

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH204955A (de) * 1938-02-02 1939-05-31 Sulzer Ag Auf der Druckseite von Kreiselpumpen, insbesondere Kesselspeisepumpen, angeordnetes Rückschlagorgan.
FR1066887A (fr) * 1951-07-31 1954-06-10 Shell Refining & Marketing Co Perfectionnements aux appareils distributeurs de liquides
DE1108992B (de) * 1958-06-06 1961-06-15 Gerdts Gustav F Kg Verfahren zur Sicherstellung des Durchflusses einer Mindestmenge
GB893102A (en) * 1958-12-19 1962-04-04 G & J Weir Ltd System for controlling the flow of byepass liquid from a centrifugal pump
US3318321A (en) * 1964-08-29 1967-05-09 Odendahl Wilhelm Minimum amount control for centrifugal type boiler feed pumps
US3349714A (en) * 1965-10-11 1967-10-31 Ford Motor Co Power steering pump

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0275247B1 (en) * 1987-01-16 1991-10-09 Fisher Controls International, Inc. Taper key joint for connecting a rotary valve shaft to a valve disc
US20100206391A1 (en) * 2007-03-30 2010-08-19 Tyco Valves & Controls, Inc. Adjustable recirculating valve
US8215330B2 (en) * 2007-03-30 2012-07-10 Tyco Valves & Controls, LP Adjustable recirculating valve
US20110000556A1 (en) * 2009-07-06 2011-01-06 Rainer Klemm Non-return valve having improved automatic recirculation
FR2947608A1 (fr) * 2009-07-06 2011-01-07 Rainer Klemm Clapet anti-retour a recirculation automatique amelioree
EP2273126A1 (fr) * 2009-07-06 2011-01-12 Rainer Klemm Clapet anti-retour à recirculation automatique améliorée
CN104565453A (zh) * 2013-10-28 2015-04-29 北京航天动力研究所 旁通结构为转阀的自控回流阀
CN105626551A (zh) * 2016-03-04 2016-06-01 中国五环工程有限公司 一种旋转阀式泵保护装置
WO2021008899A1 (de) * 2019-07-12 2021-01-21 KSB SE & Co. KGaA Ventil
WO2021008903A1 (de) * 2019-07-12 2021-01-21 KSB SE & Co. KGaA Armaturanordnung
CN114072608A (zh) * 2019-07-12 2022-02-18 Ksb股份有限公司 管接头装置

Also Published As

Publication number Publication date
GB1228919A (enrdf_load_stackoverflow) 1971-04-21
FR1605355A (enrdf_load_stackoverflow) 1974-10-31
DE1653778B2 (de) 1973-03-01
DE1653778C3 (de) 1979-08-16
AT279370B (de) 1970-03-10
DE1653778A1 (de) 1971-09-09

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