US3672398A - Accumulator for absorbing a pulsation of pump pressure - Google Patents

Accumulator for absorbing a pulsation of pump pressure Download PDF

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Publication number
US3672398A
US3672398A US3672398DA US3672398A US 3672398 A US3672398 A US 3672398A US 3672398D A US3672398D A US 3672398DA US 3672398 A US3672398 A US 3672398A
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US
United States
Prior art keywords
accumulator
rubber bag
conduit
neck
cavity
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
Ken Ichiryu
Mitsuaki Takenoshita
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Hitachi Ltd
Original Assignee
Hitachi Ltd
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Publication date
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Publication of US3672398A publication Critical patent/US3672398A/en
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Classifications

    • 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
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • F04B11/0008—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators
    • F04B11/0016—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators with a fluid spring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/04—Devices damping pulsations or vibrations in fluids
    • F16L55/045—Devices damping pulsations or vibrations in fluids specially adapted to prevent or minimise the effects of water hammer
    • F16L55/05—Buffers therefor
    • F16L55/052—Pneumatic reservoirs
    • 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
    • Y10T137/8593—Systems
    • Y10T137/85978—With pump
    • Y10T137/86035—Combined with fluid receiver
    • Y10T137/86043—Reserve or surge receiver

Definitions

  • the present invention relates to an accumulator for absorbing a pulsation of pump pressure.
  • the object of the present invention is to provide an accumurepresented by the formula
  • FIG. 2 exemplifies a small sized accumulator which has been called noise damper and used for the purpose of protecting the needle of a pressure gauge or the like.
  • numeral l designates a rubber bag, 2 a-bomb, 3" a rigid plate bonded to the rubber bag to protect the latter by contacting with a seat portion 4' of the inside surface of the bomb, and 5' r a port connected with a main conduit.
  • the effective inner diameter of a neck 6 is usually small.
  • FIG. 3 is a view schematically showing the conduit arrangement of a pump, in which an accumulator is incorporated to absorb a pulsation of.
  • numeral 11 designates the the accumulator becomes small and similarlythe intended pump, 12 a main conduit, 13 a neck of the accumulator, 14 a bomb of the accumulator, 15 a rubber bag of the accumulator, 16 a sealed gas chamber of the accumulator, 17 a throttle and 18 a tank.
  • the throttle 17 is depicted in the sense that the hydraulic line performs a work.
  • K 'y.P.S /v (2) wherein is the polytropic number of the sealed gas, P is the inherent mean pressure and v is the volume of the gas at a pressure I.
  • the natural frequency fn of the accumulator is P small, if the values of Pand p are constant.
  • the amount of pulsating pressure damped by the accumulator is shown in FIG. 4. As seen, the damping band appears on each side of the natural frequency fn of the accumulator.
  • the area. of thedamping band can be expressed by the ratio of a comer frequency f at which the pulsating pressure is damped I by 3 dB, to the natural frequency fn, i.e. (f /L).
  • the frequency f is represented theoretically by the formula,
  • the width of the damping region can be increased by making the value of f small when the value of j ⁇ , is constant or, in other words, under the condition that the value of a is constant; and by making the value of Sp/S small when the value within the radical sign of Formula (5) is constant.
  • FIG. 3 is a schematic view illustrating the manner in which the accumulator is used
  • FIG. 4 is a diagram showing a theoretical curve of damping by the accumulator
  • FIG. 5 is a side view showing in section an embodiment of the accumulator according to the present invention.
  • FIG. 6 is a front elevational view 'of the protective metal screen
  • FIG. 7 is a side view showing in section another embodiment of the accumulator according to the invention.
  • FIG. 8 is a diagram illustrating in comparison the pulsating pressure absorbing results in a gear pump when no accumulator was used, when the prior art accumulator of FIG. 2 was used and when the accumulator, of this invention is used,
  • FIG. 9 is a cross-sectional view showing the construction of the rubber bag effectively used in the present invention.
  • numeral 20 designates a coupling-like segment of a pressure fluid conduit and a neck 21 of an accumulator is formed integrally therewith.
  • the neck 21 As a part of the conduit segment 20, the handling of the accumulator becomes extremely simple, and in addition, a fluid leakage which would otherwise occur at the a joint of the neck and the conduit, can be completely avoided.
  • Numeral 22 designates a flange formed around the top end of the nee ⁇ : 21,'and 23 designates a flexible rubber bag having a U-shaped cross-section and disposed in the interior cavity A of the neck 21.
  • the rubber bag 23 has a flange 24 formed at the means of bolts 28.
  • Numeral 29 designates a metal screen secured to the lower portion of the neck 21 as by welding, so as to be located on the underside of the rubber bag 23.
  • the metal screen 29 is composed of warps a and wefts b. Thismetal screen 29 serves to prevent rupture of the rubber bag 23 due to excessive exhigher components of pulsating preSsure though slightly effective against the primary component of the same.
  • the accumulator according to the invention has an effect of damping the primary component of pulsating pressure by about dB and the secondary and tertiary components of the same by about 10 dB.
  • FIG. 9 shows the constructions of a rubber bag effectively used in the present invention.
  • the wall thickness of the rubber bag is made smallest at 'the crest portion 41 of the outwardly bulged peripheral wall thereof and is progressively increased both upwardly and downwardly therefrom.
  • the rubber bag may be made from a rubber material having a tire cord incorporated therein, and
  • Numeral 30 designates external threads formed on each end of the conduit segment 20 for connection with a pressure fluid conduit, e.g. the conduit 12 shown in FIG. 3.
  • a pressure fluid conduit e.g. the conduit 12 shown in FIG. 3.
  • the ratio of the neck diameter da to the diameter of the conduit tip is l, i.e. da/dp l.
  • FIG. 7 shows another embodiment of the present invention, in which same numerals as those used in FIG. 5 indicate same parts.
  • Numeral 31 designates a neck. of an accumulator formed integrally with a conduit segment 20. The inside peripheral surface of the neck 31 is recessed as at 32 and an annular seat 33 isformed below the recess32.
  • Numeral 34 designates a rubber bag disposed in the internal cavity A of the neck 31. The peripheral wall of the rubber bag 34 isbulged outwardly in a shape complementary to the shape of the-recess 32, and a metal plate 35 is secured to the undersurface of the rubber bag 34 by an adhesive. The metal plate 35 has the same functions as the metal screen 29 in the preceding embodiment, by contacting the seat 33.
  • the metal plate 35 obviates the disadvantage of the metal screen 29 that the rubber bag bulges through the individual meshes of the screen and tends to rupture when the meshes are coarse.
  • the seat 33 has the advantage that the cumbersome operation required for mounting the metal screen 29 can be eliminated.
  • the construction involving the seat 33 is employed only when the metal plate 35 is provided on the rubber bag.
  • the ratio of the neck diameter da to the diameter of the conduit dp, in this embodiment, is l, i.e. da/dp 1.
  • FIG. 8 is a diagram showing the relationship between the frequency of pulsation and the amount of pulsating pressure damped, in the cases when no accumulator was used, when the conventional accumulator was used and when the accumulator of the present invention, shown in FIG. 5, was used. From the diagram, it will be clearly understood that the conventional accumulator is ineffective against the secondary and sealing a gas therein.
  • an accumulator can be obtained which is capable of highly effectively absorbing a pulsation of pump pressure, and hence the invention is of great industrial advantage.
  • An accumulator for absorbing a pulsation of pump pressure comprising a cylindrical neck (21, 31) projecting outwardly from a conduit (20) connected to a pump, said neck defining a substantially cylindrical cavity (A) having a lower end directly opening to said conduit and an upper end closed with a cover (25), a substantially cylindrical rubber bag (23,

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Reciprocating Pumps (AREA)
  • Pipe Accessories (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
US3672398D 1969-07-23 1970-07-15 Accumulator for absorbing a pulsation of pump pressure Expired - Lifetime US3672398A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5768769A JPS521126B1 (ja) 1969-07-23 1969-07-23

Publications (1)

Publication Number Publication Date
US3672398A true US3672398A (en) 1972-06-27

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Family Applications (1)

Application Number Title Priority Date Filing Date
US3672398D Expired - Lifetime US3672398A (en) 1969-07-23 1970-07-15 Accumulator for absorbing a pulsation of pump pressure

Country Status (6)

Country Link
US (1) US3672398A (ja)
JP (1) JPS521126B1 (ja)
CH (1) CH512012A (ja)
DE (1) DE2036199A1 (ja)
FR (1) FR2055443A5 (ja)
GB (1) GB1313615A (ja)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4141240A (en) * 1976-07-01 1979-02-27 Nissan Motor Company, Limited Flow rate measuring device
US4166655A (en) * 1977-10-17 1979-09-04 Spero Theodore P Apparatus for equalizing pressure and absorbing shock in a pneumatic braking system
US4398781A (en) * 1981-10-09 1983-08-16 Amf Incorporated Sealing assembly for a geophysical cable connector
EP0300791A1 (en) * 1987-07-24 1989-01-25 Inax Corporation Water hammer absorber
US6439156B1 (en) * 2000-11-13 2002-08-27 Dec International, Inc. Milking vacuum fluctuation filter
WO2003087584A1 (de) * 2002-04-17 2003-10-23 Hydac Technology Gmbh Hydrodämpfer
US20100062384A1 (en) * 2008-09-05 2010-03-11 Eric Lavoie Oil burning system
US20110265894A1 (en) * 2010-04-30 2011-11-03 Kanjun Yamamoto Apparatus for controlling internal pressure of hermetically sealed chamber
US20160131120A1 (en) * 2013-06-28 2016-05-12 Robert Bosch Gmbh High-Pressure Fuel Pump
US20190338878A1 (en) * 2018-05-07 2019-11-07 Manuel Carcare Gimeno Pulsation Dampener
US11125374B2 (en) * 2018-06-25 2021-09-21 Performance Pulsation Control, Inc. Retaining sleeve for high pre-charge cartridge
US11644155B2 (en) * 2018-01-25 2023-05-09 Petróleo Brasileiro S.A,—Petrobras Auxiliary system and method for starting or restarting the flow of gelled fluid

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3881519A (en) * 1973-04-23 1975-05-06 Greer Hydraulics Inc Pressure vessel
DE2824604C2 (de) * 1978-06-05 1982-05-06 Klein, Schanzlin & Becker Ag, 6710 Frankenthal Druckstoßsicherung
JPS6055639B2 (ja) * 1979-02-02 1985-12-05 三菱重工業株式会社 圧力脈動吸収装置
FR2638812A1 (fr) * 1988-11-04 1990-05-11 Boisseau Rene Dispositif d'amortissement de pulsations de fluide pompe
CA2052201A1 (en) * 1990-10-24 1992-04-25 Richard C. Gerlach Positive displacement pump with rotating reciprocating piston and improved pulsation dampening
IT1261305B (it) * 1993-06-22 1996-05-14 Gevipi Ag Dispositivo smorzatore di vibrazioni e di rumore, per impianti idraulici
GB201501598D0 (en) 2015-01-30 2015-03-18 Mexichem Fluor Sa De Cv Compositions
AT522152B1 (de) * 2019-02-19 2020-09-15 Hainzl Ind Gmbh Hydrospeicher zur Anspeisung von Stellgliedern mit einer Betriebsfrequenz von mehr als 100 Hz

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4141240A (en) * 1976-07-01 1979-02-27 Nissan Motor Company, Limited Flow rate measuring device
US4166655A (en) * 1977-10-17 1979-09-04 Spero Theodore P Apparatus for equalizing pressure and absorbing shock in a pneumatic braking system
US4398781A (en) * 1981-10-09 1983-08-16 Amf Incorporated Sealing assembly for a geophysical cable connector
EP0300791A1 (en) * 1987-07-24 1989-01-25 Inax Corporation Water hammer absorber
US5020565A (en) * 1987-07-24 1991-06-04 Inax Corporation Water hammer absorber
US6439156B1 (en) * 2000-11-13 2002-08-27 Dec International, Inc. Milking vacuum fluctuation filter
WO2003087584A1 (de) * 2002-04-17 2003-10-23 Hydac Technology Gmbh Hydrodämpfer
US20050129549A1 (en) * 2002-04-17 2005-06-16 Herbert Baltes Hydro damper
US20100062384A1 (en) * 2008-09-05 2010-03-11 Eric Lavoie Oil burning system
US8052418B2 (en) * 2008-09-05 2011-11-08 Energy Efficiency Solutions, Llc Oil burning system
US8672672B2 (en) 2008-09-05 2014-03-18 Energy Efficiency Solutions, Llc Oil burning system
US20110265894A1 (en) * 2010-04-30 2011-11-03 Kanjun Yamamoto Apparatus for controlling internal pressure of hermetically sealed chamber
US8453671B2 (en) * 2010-04-30 2013-06-04 Shibuya Kogyo Co., Ltd. Apparatus for controlling internal pressure of hermetically sealed chamber
US20160131120A1 (en) * 2013-06-28 2016-05-12 Robert Bosch Gmbh High-Pressure Fuel Pump
US10443587B2 (en) * 2013-06-28 2019-10-15 Robert Bosch Gmbh High-pressure fuel pump
US11644155B2 (en) * 2018-01-25 2023-05-09 Petróleo Brasileiro S.A,—Petrobras Auxiliary system and method for starting or restarting the flow of gelled fluid
US20190338878A1 (en) * 2018-05-07 2019-11-07 Manuel Carcare Gimeno Pulsation Dampener
US11125374B2 (en) * 2018-06-25 2021-09-21 Performance Pulsation Control, Inc. Retaining sleeve for high pre-charge cartridge

Also Published As

Publication number Publication date
FR2055443A5 (ja) 1971-05-07
JPS521126B1 (ja) 1977-01-12
GB1313615A (en) 1973-04-18
DE2036199A1 (de) 1971-02-11
CH512012A (de) 1971-08-31

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