EP0044494A1 - Nozzle for ring jet pump - Google Patents

Nozzle for ring jet pump Download PDF

Info

Publication number
EP0044494A1
EP0044494A1 EP19810105431 EP81105431A EP0044494A1 EP 0044494 A1 EP0044494 A1 EP 0044494A1 EP 19810105431 EP19810105431 EP 19810105431 EP 81105431 A EP81105431 A EP 81105431A EP 0044494 A1 EP0044494 A1 EP 0044494A1
Authority
EP
Grant status
Application
Patent type
Prior art keywords
element
position
nozzle
male element
throat
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.)
Withdrawn
Application number
EP19810105431
Other languages
German (de)
French (fr)
Inventor
Anthony Walby Wakefield House Wakefield
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.)
GENERAL CONVEYORS Ltd
Original Assignee
GENERAL CONVEYORS Ltd
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

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04FPUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/44Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
    • F04F5/46Arrangements of nozzles
    • F04F5/461Adjustable nozzles
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04FPUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/44Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
    • F04F5/48Control

Abstract

The variable geometry nozzle has outer and inner boundaries of an annular nozzle passage defined respectively by flaring surface formed mternally in a female element (26) and a tapering surface formed externally on a male element (22) located within the female element (26) The element (22) is adjustable axially relative to element (26) from a first position to a second position to mcrease the cross-sectional area of the throat of said nozzle passageway progressively, said boundaries being shaped to diverge from the throat to the exit when the male element (22) is in the first position and to be parallel when the male (22) element is in the second position.

Description

  • The term "jet pump" describes a pump in which motive power is provided by a high-pressure stream of fluid which is directed through a nozzle designed to impart a high velocity to the fluid so that the fluid issues in a high velocity jet into a mixing chamber and creates a low-pressure area in the mixing chamber which causes a suction fluid to flow into this chamber. At this point there is an exchange of velocities producing a uniformly mixed stream travelling at a velocity intermediate to the motive and suction velocity. In a diffuser which is shaped to reduce velocity gradually, the energy of the moving stream is converted to pressure at the discharge end.
  • A ring jet pump is a jet pump with an annular nozzle, the suction fluid being induced axially through the centre of the jet or nozzle. In order that a nozzle should emit a jet of fluid having the greatest possible energy related to the energy input, the expansion ratio from the throat of the nozzle to the exit of the nozzle will vary depending on whether the fluid is a gas or a liquid. The expansion ratio is the ratio of the cross-sectional area at the exit to that of the throat. In the case where the fluid is a gas, if the pressure for given density of the incoming gas is sufficient, a divergent discharge portion is required to prevent a shock wave, and the energy loss it entails, from forming across the exit. If the pressure is insufficient, no shock wave will form and the discharge portion may be parallel or non- existent depending upon the application. It so happens that a high pressure gas is usually required at small volumetric flow and therefore needs to discharge through a nozzle having a small throat and having a high divergence ratio, while a low pressure gas or a liquid is normally associated with a high flow rate in order to possess a substantial energy level, and therefore needs to discharge through a nozzle having a large throat and having a divergence ratio of unity.
  • Jet pumps are known in which the nozzle can be proportioned to control the motive flow, but as far as the present applicants are aware there is no ring jet pump with a variable geometry, nor has it been possible to provide a ring jet nozzle the divergence ratio of which is variable to accommodate both high and low pressure motive fluids.
  • It is an object of this invention to provide such a jet.
  • According to the invention there is provided a nozzle for a ring jet pump including inner and outer boundaries defining an annular throat, the outer boundary being formed on a female element and the inner boundary being formed on a male element which is located within the female element and is axially adjustable with respect thereto from a first to a second position to increase the cross-sectional area of the throat progressively, the boundaries being shaped to diverge from the throat to the exit when the male element is in the first position and to be parallel when the male element is in the second position.
  • With the male element in the first position, the expansion ratio will desirably have a high value, while the expansion ratio preferably will not significantly exceed a value of unity in the second position of the male element.
  • In the preferred form of the invention the male element is movable beyond the second position to further increase the cross sectional area of the throat and the boundaries are shaped to maintain the expansion ratio substantially at unity notwithstanding the movement of the male element beyond the second position.
  • The boundaries may be in the shape of two cones of differing angles, the boundary on the female element merging, at one end thereof, with the bore of a mixing chamber and terminating at the other end in a convex radius in a manifold or plenum, and the conical boundary on the male element being truncated where the element projects into the mixing chamber and merging into a convex radius where it enters the manifold.
  • An embodiment of the invention is described below with reference to the accompanying drawings in which:
    • FIGURE 1 is a partial view in axial section through a ring jet pump having a variable geometry nozzle embodying the invention; and
    • FIGURES 2, 3 and 4 are partial sectional views showing the nozzle at various stages of axial displacement of the male element relatively to the female element.
  • In Figure 1 a ring jet pump 10 with an annular, variable geometry nozzle is shown. The motive fluid enters the pump 10 by means of a connection 20 and a manifold 14, which acts as a plenum. From the manifold 14 the fluid discharges through the nozzle and induces a suction fluid to flow axially along the bore of the jet into a mixing chamber 16.
  • The manifold 14 with the motive fluid connection 20 thereon is rigidly mounted on a male element 22 of the nozzle and is sealed with respect to element 22 by means of an O-ring 24. Entrainment takes place at the surface of a cone 18 extending downstream from the tip of the male element 22 and forming the interface between the motive fluid and the induced fluid. A female element 26 of the nozzle is formed at the end of a diffuser tube 28. The tube 28 extends into the end of the manifold and is in screw-threaded arrangement therewith via interengaging complementary screw threads 30 on the tube 28 and the manifold. The tube 28 is sealed with respect to the manifold by means of an O-ring 32. By rotating the male element 22 and manifold 14 relatively to the diffuser tube 28, the male element 22 of the nozzle may be axially displaced with respect to the female element 26.
  • The male element 22 is generally tubular and has an approximately frusto conical outer surface at one end, which end, in the position shown in Figure, 1 extends into an approximately frusto conical recess formed internally in female element 26, the internal and external surfaces being substantially coaxial in relation to the tube 28, tapering in the same axial direction relative to the pump axis, and defining respective boundaries of an annular-section passage connecting the interior of manifold 14 with the mixing chamber. The boundaries are, more particularly, in the shape of two cones of differing angles, the boundary of the female element merging, at the end thereof further from member 22, with the bore of the mixing chamber 16 and terminating at the free end of the female element in a convex radius (as viewed in axial section), and the conical boundary afforded by the male element being truncated at the free end of the male element where the male element projects into the mixing chamber and merging into a convex radius (as viewed in axial section), further from the free end of the male element.
  • In operation of the pump a fluid jet, of annular cross section, is formed by fluid passing under pressure from the manifold 14 through through said annular section passage.
  • In Figure 2 the tube 28 is shown to be screwed in to an extreme position in which the conical boundary formed on the female element 26 is closely adjacent to the conical boundary formed on the male element 22. The nozzle aperture is therefore of a small cross-sectional area, while at the same time, the divergence ratio of the two boundaries is high, e.g. over 2:1. This is a situation appropriate for a high pressure gaseous motive fluid.
  • In Figure 3 the diffuser tube 28 has been unscrewed to a central position and the male and female boundaries define between them a large aperture for moderate pressure gaseous motive fluid with a moderate divergence ratio e.g. 1,5 to 2:1.
  • In Figure 4 the diffuser tube 28 has been unscrewed even further so that the male and female boundaries define between them an aperture with a large cross sectional area which is suitable for liquid or low pressure gaseous motive fluid. The divergence ratio in this position is unity. Any further unscrewing of the diffuser tube 28 with a consequent axial displacement of the female element 26 of the nozzle relatively to the male element 22, will merely result in an aperture with an enlarged cross-sectional area while the divergence ratio maintains a value of unity.
  • It will be appreciated that, for any set of conditions, a ring jet can be designed having a fixed geometry to suit the conditions but the variable geometry nozzle proposed confers the advantage that one jet pump may be used and adjusted to suit a large variety of conditions.

Claims (5)

1. A nozzle for a ring jet pump including inner and outer boundaries defining an annular throat, the outer boundary being formed on a female element and the inner boundary being formed on a male element which is located within the female element and is axially adjustable with respect thereto from a first to a second position to increase the cross-sectional area . of the throat progressively, the boundaries being shaped to diverge from the throat to the exit when the male element is in the first position and to be parallel when the male element is in the second position.
2. The nozzle of claim 1 in which, with the male element in the first position, the expansion ratio has a high value while the expansion ratio does not exceed a value of unity in the second position of the male element.
3. The nozzle of claim 2 in which the male element is movable beyond the second position to further increase the cross sectional area of the throat and the boundaries are shaped to maintain the expansion ratio at unity notwithstanding the movement of the male element beyond the second position.
4. The nozzle of claim 1 in which the boundaries are in the shape of two cones of differing angles, the boundary of the female element merging, at one end thereof, with the bore of a mixing chamber and terminating at the other end in a convex radius on a manifold, and the conical boundary on the male element being truncated where the element projects into the mixing chamber and merging into a convex radius where it enters the manifold.
5. A nozzle substantially as hereinbefore described with reference to, and as shown in, the accompanying drawings.
EP19810105431 1980-07-17 1981-07-13 Nozzle for ring jet pump Withdrawn EP0044494A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
ZA8004329 1980-07-17
ZA804329 1980-07-17

Publications (1)

Publication Number Publication Date
EP0044494A1 true true EP0044494A1 (en) 1982-01-27

Family

ID=25574807

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810105431 Withdrawn EP0044494A1 (en) 1980-07-17 1981-07-13 Nozzle for ring jet pump

Country Status (2)

Country Link
EP (1) EP0044494A1 (en)
JP (1) JPS5771000A (en)

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GB2142978A (en) * 1983-05-18 1985-01-30 Nisshin Flour Milling Co Powder disperser
GB2174943A (en) * 1985-05-10 1986-11-19 Avdel Ltd Breakstem fastener installation tool
GB2179099A (en) * 1985-08-12 1987-02-25 Vacuum Pneumatic Transfer Equi Vacuum aerator feed nozzle
GB2185533A (en) * 1986-01-08 1987-07-22 Rolls Royce Ejector pumps
FR2609756A1 (en) * 1987-01-19 1988-07-22 Leclercq Yves Suction device
FR2769054A1 (en) * 1997-10-01 1999-04-02 Marwal Systems Jet pump comprising a variable section nozzle
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CN104295538A (en) * 2014-09-29 2015-01-21 江苏大学 Jet pump with variable area ratio
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US2399249A (en) * 1944-10-24 1946-04-30 Gen Tank Service Inc Apparatus for the movement of viscous materials

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US9982677B2 (en) 2014-07-29 2018-05-29 Dyson Technology Limited Fan assembly
CN104295538A (en) * 2014-09-29 2015-01-21 江苏大学 Jet pump with variable area ratio

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