US2748897A - Dashpot with air separator - Google Patents

Dashpot with air separator Download PDF

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Publication number
US2748897A
US2748897A US338963A US33896353A US2748897A US 2748897 A US2748897 A US 2748897A US 338963 A US338963 A US 338963A US 33896353 A US33896353 A US 33896353A US 2748897 A US2748897 A US 2748897A
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United States
Prior art keywords
cylinder
liquid
air
dashpot
towards
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Expired - Lifetime
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US338963A
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English (en)
Inventor
Colin C Mitchell
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Individual
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Individual
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    • 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/34—Special valve constructions; Shape or construction of throttling passages
    • F16F9/344—Vortex flow passages
    • 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/10—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using liquid only; using a fluid of which the nature is immaterial

Definitions

  • This invention relates to a dashpot having a cylinder open at one end only to receive a plunger or ram whose movement is to be retarded and finally stopped and which is maintained full of liquid, with the outer portion thereof in a state of spin or circumferential rotation by a stream of jets of liquid, preferably water, projected into the open end of the cylinder, as disclosed in the patent to Waterston No. 2,663,385.
  • means are provided whereby (1) air which may be entrained or dissolved in the liquid, on reaching the closed end of the cylinder, is caused to be separated from the liquid and vented from the cylinder, and (2) the circumferential velocity of the liquid, on reaching the closed end of the cylinder, is converted to pressure energy which causes the liquid to flow axially towards the center of the cylinder and thence towards the open end of the cylinder as an axially-flowing core, rather than as a spirally-flowing core.
  • the straight axial flow of the core portion towards the open end of the cylinder prevents any vortex forming at the open end of the cylinder, and also produces a certain amount of kinetic energy directed in a direction in opposition to the movement of the plunger into the cylinder.
  • the damping or retarding action of the dashpot is materially improved.
  • the above objectives are obtained by bafliing means at the closed end of the cylinder, preferably a vane extending from the closed end into the path of the circumferentially-moving liquid, which breaks up the circumferential flow of the liquid and causes it to flow axially towards the open end of the cylinder; and by providing a vent for air at the closed end of the cylinder.
  • the vane preferably is so positioned with respect to the vent that one end is only slightly in advance or upstream 2,748,897 Patented June 5, 1956 therefrom with respect to the circumferentially-moving liquid.
  • the baffling effect of the vane causes eddy currents to be formed in the moving stream of liquid on the downstream side of the vane.
  • FIG. 1 is a longitudinal section of the cylinder and Fig. 2 is a cross section through the cylinder on the plane 22,.
  • 2 denotes the cylinder
  • 2 denotes nozzles at the open end of the cylinder directing jets 3 of fluid into the cylinder to maintain the cylinder full of liquid with the outer portion thereof in a state of circumferential rotation or spin
  • 4 denotes a vent hole at the closed end of the cylinder.
  • the line 5 indicates the helical path pursued by the outer circumferential portion of the liquid travelling inwards of the cylinder, towards its closed end
  • the arrow 6 indicates the direction of spin or rotation of that portion of the liquid
  • 7 denotes a radial vane located at the closed end of the cylinder and so orientated that one end of it is at a small angle in advance, i. e., upstream, of the vent hole 4 in relation to the direction of spin or rotation of the liquid.
  • the axial portion of the liquid flowing towards the open end of the cylinder has a certain kinetic energy which, on striking the leading end of the plunger, is converted to pressure energy. This pressure energy is exerted against the plunger and, thus, further increases the damping or retarding efiect of the liquid in the cylinder. Since the core'portion of the liquid flowing towards the open end of the cylinder is of relatively low pressure, some of the air therein will rise and pass into the circumferentially-spiraling outer layer flowing towards the closed end of the cylinder and thus returned to that end for discharge through the vent opening 4. The remaining air in the core portion eventually passes out of the cylinder at its open end along with the core portion of the fluid.
  • a dashpot including a cylinder open at one end and closed at its other end, said cylinder being adapted to receive a plunger whose movement is to be retarded, said cylinder having a vent opening at its closed end and at least one tangential, liquid-injecting nozzle at its open end, whereby liquid introduced into the cylinder is caused to move spirally adjacent the cylinder wall towards the closed end thereof, and bathing means at the closed end of the cylinder for impeding the circumferential movement of the liquid at that end of the cylinder.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Colloid Chemistry (AREA)
US338963A 1952-02-28 1953-02-26 Dashpot with air separator Expired - Lifetime US2748897A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2748897X 1952-02-28

Publications (1)

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US2748897A true US2748897A (en) 1956-06-05

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ID=10914587

Family Applications (1)

Application Number Title Priority Date Filing Date
US338963A Expired - Lifetime US2748897A (en) 1952-02-28 1953-02-26 Dashpot with air separator

Country Status (3)

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US (1) US2748897A (en(2012))
BE (1) BE536929A (en(2012))
FR (1) FR1120979A (en(2012))

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1187591A (en) * 1915-04-16 1916-06-20 Frank F Cleighton Device for dispensing ginger-ale.
GB104183A (en) * 1916-02-16 1918-02-15 Rasmussen & Ernst G M B H Process and Apparatus for Separating Air or Gases from Liquids.
GB300391A (en) * 1927-11-12 1928-11-15 Drysdale & Co Ltd Improvements in apparatus for de-aerating lubricating oil
US2663385A (en) * 1950-07-10 1953-12-22 Brown Brothers & Co Ltd Fluid seal

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1187591A (en) * 1915-04-16 1916-06-20 Frank F Cleighton Device for dispensing ginger-ale.
GB104183A (en) * 1916-02-16 1918-02-15 Rasmussen & Ernst G M B H Process and Apparatus for Separating Air or Gases from Liquids.
GB300391A (en) * 1927-11-12 1928-11-15 Drysdale & Co Ltd Improvements in apparatus for de-aerating lubricating oil
US2663385A (en) * 1950-07-10 1953-12-22 Brown Brothers & Co Ltd Fluid seal

Also Published As

Publication number Publication date
FR1120979A (fr) 1956-07-17
BE536929A (en(2012)) 1959-02-25

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