US3640645A - Method and apparatus for aspirating fluids - Google Patents

Method and apparatus for aspirating fluids Download PDF

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US3640645A
US3640645A US853647A US3640645DA US3640645A US 3640645 A US3640645 A US 3640645A US 853647 A US853647 A US 853647A US 3640645D A US3640645D A US 3640645DA US 3640645 A US3640645 A US 3640645A
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duct
wall
passageway
sleeve
entrainment
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US853647A
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Alan K Forsythe
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Rocket Research Co
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Rocket Research Co
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63C—LAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS; LIFE-SAVING IN WATER; EQUIPMENT FOR DWELLING OR WORKING UNDER WATER; MEANS FOR SALVAGING OR SEARCHING FOR UNDERWATER OBJECTS
    • B63C9/00—Life-saving in water
    • B63C9/08—Life-buoys, e.g. rings; Life-belts, jackets, suits, or the like
    • B63C9/18—Inflatable equipment characterised by the gas-generating or inflation device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
    • F04F5/46—Arrangements of nozzles
    • F04F5/466—Arrangements of nozzles with a plurality of nozzles arranged in parallel
    • 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
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/14—Check valves with flexible valve members

Definitions

  • ABSTRACT [21] Appl. No.: 853,647 An aspirator check valve in the fonn of a cylindrical sleeve which is restrained at its front end and along circumferentially spaced lines extending axially rearwardly from said front end, [52] U.S. CL ..4l7ll74,417/176,417/177, and is unrestrained in the remainder of its extent
  • the Sleeve 417/185 417/191 417/ lies tight against an outer wall of the aspirator when open and [51] lul. Cl.
  • the upstream end restraining means includes a resilient band designed to flex radially inwardly in response to References Cited an over pressure, so that such sleeve also functions as an over UNITED STATES PATENTS pressure chef valve A shortened aspirator comprising a plurality of concentrically 1,026,399 5/1912 Koerting ..417/ 174 arranged primary and secondary flow passageways, and such 3,370,784 2/1968 Day 167 an aspirator combined with the sleeve-type check valve. 3,460,746 8/1969 Green et a1.
  • Prior art aspirating devices aiming towards rapid inflation of these devices have generally taken one of two forms.
  • the first form is exemplified by the aspirator shown in the patent to Neigel U.S. Pat. No. 2,859,908.
  • An aspirating gas is introduced as a high-velocity stream into a venturi nozzle adapted to discharge into the object being inflated.
  • the upstream end of the nozzle is open to the surrounding air and the high-velocity gas stream creates a suction to draw or aspirate ambient air into the stream for the purpose of increasing its volume.
  • a check valve in the nozzle is closed by back pressure to prevent deflation.
  • a second form of inflation aspirator is shown in the patent to Crawford et al. US. Pat. No. 2,772,829. It is adapted for use in installations wherein the combined stream of aspirating gas and aspirated air, although of a high volume, is of an insufflcient pressure to fully inflate the object.
  • a check valve is provided to be closed by back pressure when the pressure in the object being inflated reaches the pressure of the air and gas stream. Aspiration of ambient air is then stopped; however, the gas flow is continued and it, by itself being of a higher pressure than the gases in the object, continues to inflate the object.
  • This invention is directed to the aspiration of fluids and particularly, although not necessarily limited to, the aspiration of fluids for the purpose of inflating an object.
  • a feature of the invention is a sleeve-type check valve which prohibits backflow from the second stage of the aspirator.
  • the sleeve is highly responsive and is self-sealing. It is also simple and inexpensive to manufacture and is virtually foolproof in operation.
  • Another feature is a combined secondary stage check valve and excessive pressure relief valve.
  • the sleeve-type check valve lends itself to this dual use.
  • the upstream end of the sleeve is secured to a resilient band. Relief of the excess pressure is accomplished by the excess pressure flexing the band radially inwardly to break the seal between the front end of the sleeve and the support wall therefor.
  • Still another feature is the concept of shortening the overall length of the aspirator by employing a plurality of injection nozzles as a substitute for a single nozzle.
  • the nozzles are preferably also arranged at two locations, namely, centrally and in an annulus about the longitudinal axis of the duct.
  • the sleeve-type check valve is secured to the wall of the aspirator, it lends itself well to use in the combined multistage, multinozzle aspirator.
  • FIG. 1 is a longitudinal section of atwo-stage aspirator employing a sleeve-type check valve
  • FIG. 2 is a vertical section taken along line 2-2 of FIG. I;
  • FIG. 3 is a graphical illustration showing the pressureflow characteristics of the aspirator
  • FIG. 4 is a graphical illustration showing the pressure-time characteristics of a two stage aspirator and comparing the time required to pressurize using the overpressurization relief valve versus customary pressurization without a relief valve;
  • FIG. 5 is a longitudinal section of a multistage aspirator employing a multinozzle injector
  • FIG. 6 is a vertical section of the injector shown in FIG. 5 taken along the line 6-6 in FIG. 5;
  • FIG. 7 is a fragmentary longitudinal section of the aspirator shown in FIG. 5 with the sleeve-type check valve closed;
  • FIG. 8 is a vertical section of the aspirator shown in FIG. 7 taken along the line 8-8 of FIG. 7;
  • FIG. 9 is a schematic illustration of the spray cone pattern of the aspirator shown in FIGS. 5-8;
  • FIG. 10 is a schematic illustration of the inner tube as taken along the arrows l0l0 of FIG. 9;
  • FIGS. II, 12 and 13 are isometric operational views of a two-stage aspirator showing; in FIG. 11 fluid being aspirated in both stages; in FIG. 12 the second stage being closed by the radial inward movement of the downstream edge of the sleeve; and in FIG. 13 the excess pressure overcoming the elasticity of the resilient band to unseal the upstream edge of the sleeve.
  • the aspirator shown in FIGS. I and 2 comprises first and second stages 12 and 14, respectively.
  • the first stage includes an inner duct 16 and an injector 18 having a plurality of orifices 19 for introducing the aspirating fluid.
  • the aspirating fluid is preferably a relatively high pressure, cool gaseous product caused by a mixture of hot gases, such as the products of combustion of ammonium nitrate type solid fuel grain, and a stream of a cold liquid refrigerant, such as a pressure liquefied fluorinated hydrocarbon.
  • the inner duct 16 is positioned centrally inside an outer duct 20 forming the outer wall of the aspirator.
  • Three evenly spaced radial support plates or struts 22 rigidly interconnect the inner and outer ducts.
  • air is aspirated through the inner duct 16 and the annular opening between the inner and outer ducts.
  • the effective area of the second stage is considerably greater than for the first stage.
  • the area ratio is 3.85:1; however, this ratio is determined by the requirements of the aspirator and thus is not to be considered limitive.
  • the cylindrical sleeve is attached at its upstream ends to a flexible resilient band 26.
  • the band functions as a relief valve if such is desired, and will be described in more detail below. Should the relief function not be desired the band may be eliminated and the upstream end of the sleeve 25 secured directly to the in side surface of the outer duct 20 or the band may be made sufficiently stiff to preclude flexing.
  • the band and thus the sleeve 25, is secured at spaced points adjacent the strut 22 by suitable fasteners, such as pins 28.
  • suitable fasteners such as pins 28.
  • the struts are cut away as at 30 in the region of the cylindrical sleeve so that the sleeve fits within the struts and is clamped at three equidistantly spaced points about the inside surface of the outer duct.
  • a main check valve 32 is positioned downstream of the inner duct 16 and includes a hinge 34 which supports a circular sheet of rubberized fabric 36 that is strengthened with reinforcing disks 38 of aluminum or the like 38. As described in the aforesaid US. Pat. Nos. 3,460,746 and 3,460,747, the main check valve 32 opens under the pressure of the incoming fluid and remains open until the pressure within the inflatable object is sufficient to close the valve into the position shown in FIG. 1.
  • An annular ledge 39 is provided in the outer duct to serve as a seat for the main check valve.
  • the sleeve is generally cylindrical in form and closely hugs the inner surface of the outer duct 20.
  • backflow commences, as a result of the pressure of the gases in the inflated object exceeding the pressure of the fluid aspirated in the second stage, the strongest backflow is generally along the inner surface of the outer duct 20.
  • the backflow of gases catches the loose downstream edge of the sleeve between the struts 22 and moves these edges radially inward. Pockets are thus formed circumferentially between the struts and radially against the inner duct 16 and the struts 22.
  • the closed position of the sleeve is shown in phantom in FIG. 2 with the sleeve actually hugging the opposed surfaces of the struts and the outside surface of the inner duct 16.
  • an important feature of the invention is the fact that the perimeter drawn around the struts and the inner duct, the circumference of the sleeve, and the circumference of the inside surface of the outer duct 20 are related and this relationship may be varied to suit the application to which the aspirator is to be used.
  • the circumference of the sleeve be approximately equal to the circumference of the outer duct so that it tightly hugs the outer duct when in the open position. There are many ways to obtain this substantial equality.
  • One approach is merely to vary the circumference of the inner duct or the thickness of the struts.
  • Another approach is to add appendages or the like from the inner duct to increase the perimeter.
  • the substantial equality is obtained by using a preferred number of struts.
  • three struts are employed to bring about the substantial equality. The equality results from the fact that the circumference of the inside surface of the outer duct is greater than the circumference of the outside surface of the inner duct by an amount equal to 2X3.l4l6 X the difference in their respective radii at these two points, R R in FIG. 2.
  • the difference in circumference between the outer duct and the inner duct is approximately 6.28X Rg R
  • the radial length of each strut is, of course, equal to (R2' R1). Since each strut has two opposed surfaces, three struts will use 6X(R R,). It can thus be seen that only O.28 R -R,) remains to be distributed as surplus over the struts and inner ducts, that is, the perimeter of the struts plus the perimeter of the inner duct will equal 6 of the required 6.28X(R R,). The 0.28X(R R,) remaining is easily distributed about the struts and the inner duct resulting in a substantially tight fit between the sleeve and the struts and inner duct when in the closed position.
  • the principles of staging the aspiration of fluids into the inflatable object is best explained with reference to FIG. 3.
  • the line drawn between 3.2 (point A) on the horizontal scale to the 2 (point B) on the vertical scale represents the flow rate of fluid into the inflatable object using the second stage of the aspirator alone.
  • the data is expressed in terms of a flow ratio of secondary fluid, i.e., aspirated fluid, divided by primary fluid, i.e., aspirating fluid; however, assuming a constant flow of primary fluid, the ratio represents the total flow into the inflatable object.
  • the lines drawn between 2.2 (point C) on the horizontal scale and 4.5 (point M) on the vertical scale represents the flow rate using the first stage aspirator alone.
  • the second stage aspirator although producing a high volume of fluid out of the aspirator, can reach only a relatively low pressure whereas the first stage of the aspirator, although it has a low flow rate can produce a much higher pressure.
  • the combination of the stages that is, by stopping the second stage when the pressure in the inflatable reaches approximately 0.9 p.s.i.g. (point E) in the preferred embodiment, results in an initial high flow rate and a final lower flow rate but a relatively high pressure.
  • the slope of this curve is best illustrated by the solid black line in FIG. 3.
  • the relief valve feature is shown in FIG. 1 and in the operational views in FIGS. 11-13.
  • the upstream end of the sleeve 30 is bonded or otherwise secured to the resilient band 26.
  • the band is of a circumference approximately equal to the in side surface of the outer duct 20 so that the sleeve is pressed into sealing engagement with the outer duct.
  • the sleeve is shown formed into pockets to stop the backflow of gases when only the first stage is used.
  • the backflow pressure exceeds the pressure required to deform the band such that the band moves inwardly relieving the pressure.
  • the band is designed to flex when the desired pressure of the inflatable is reached and vibrates between the open and closed position to maintain such pressure.
  • this or a similar relief valve a method of inflation is permitted that uses a source of pressure higher than the desired final inflatable pressure.
  • the method is best illustrated with reference to FIG. 4 in which the dotted line (between F and G) represents the customary practice of using a pressure source which at its maximum is approximately equal to the desired inflatable pressure.
  • the solid curve of the figure the use of the relief valve is shown.
  • the second stage operates to point F to fill the object at a relatively constant low pressure and as the pressure begins to build up in the object and the second stage of the aspirator is closed, the curve proceeds at a much steeper slope to point H than in the dotted curve because the pressure source used for the solid curve is substantially greater than the desired object pressure.
  • the relief valve i.e., band 26, opens, the pressure is relieved and as the relief valve vibrates between the open and closed position the desired object pressure is maintained along the wavy line between points H and G. Thus the desired pressure is achieved sooner.
  • the aspirator is provided with an outer duct or conduit 42 and an inner duct or conduit 44.
  • the aspirator also includes a check valve 46 identical to the check valve 32 of FIG. I.
  • the aspirator shown in FIG. 5 includes an annular duct 48 having an outer surface 49 and an inner surface 50.
  • the inner and annular ducts are mounted in the outer duct by suitable struts 51 similar to those of FIG. I.
  • a plurality of central nozzles 52 are provided for introducing aspirating fluid into the inner duct 44.
  • a ring of nozzles 54, 24 in number in the preferred embodiment, are joined together and with the central nozzles 52 by a common pipe 55.
  • the ring of nozzles injects aspirating fluid into the annular duct 48.
  • An outer cylindrical sleeve-type check valve 56 is provided between the annular duct 48 and the outer duct 42.
  • An inner sleeve-type check valve 58 is provided between the annular duct 48 and the inner duct 44.
  • the valves 56 and 58 are identical to and operate in the same manner as the valve 24 shown in FIG. 1.
  • the second stage is shown in operation in FIGS. 5 and 6 with the sleeves lying flat against the surface 50 of the annular duct 48 and the inside wall of the outer duct 42.
  • FIG. illustrates in principle the technique for shortening the overall length of the aspirator without substantially affecting the aspirating efficiency of the device.
  • a nozzle such as those used in embodiment of FIGS. 5-8, which are of diameters in the range of 0.1 inch, emits a spray in the form of a cone. It has been found that optimum mixing of the aspirating fluid emitted from the nozzle with the aspirated air surrounding the nozzle occurs along the boundary of this cone.
  • the angle of divergence of the cone may be defined by the ratio of the length L of the spray cone at its point of intersection with the duct to the diameter D of the duct and preferably is between 6-9 to 1.
  • This L/D ratio establishes the length of the aspirating duct when a duct of a predetermined diameter is desired.
  • the diameter of the duct in the preferred embodiment of FIGS. 5-8 is, for example, 6 inches.
  • the length of the duct be 6-9X6 inches or a minimum of 36 inches. To utilize such a long duct in an aircraft slide inflation device is impractical.
  • the technique employed to shorten the effective length of the duct is to cluster a plurality of nozzles or preferably to cluster a ring of nozzles in an annulus around a central nozzle or cluster of nozzles, as shown for example in FIG. 6.
  • the theoretical shape of the spray cones emitted from these nozzles is best shown in longitudinal section in FIG. 9.
  • the ring of nozzles 54 surrounding a central or nozzles 52 will provide in diametrical cross section a series of three spray cones, having diameters d and d, respectively, filling the 6-inch diameter D of the duct.
  • each of the cones is equal to one-third of the diameter D of the duct at their points of contact. Consequently, the duct is substantially filled, but the lengths L, of the cones required to fill the duct has been decreased by a factor of 3 so that the approximate length of the duct using the plural nozzle configuration of FIG. 9 is only 12 inches.
  • the optimum configuration of the sprays emitted from the annulus is an annular slit of approximately 10/ 1,000 of an inch in width. To manufacture such a device having a slit with such a dimension would be too expensive if at all possible.
  • the alternative is to approximate a slit by arranging a ring of nozzles, 24 in the preferred embodiment, each having an opening of approximately 0.07 inch. It is, of course, recognized that lesser numbers of larger nozzles or that additional rings of nozzles may also be used.
  • the concept of the annular ring of nozzles to shorten the length of the duct is, as shown in FIGS. 5-10, also advantageously employed with the staging principles of the aspirator.
  • the desired duct area of the aspirator for the second stage operation is based on a size limitation determined by the application for which the aspirator is to be used. In the preferred embodiment this second stage duct area is approximately 27 square inches.
  • the first stage area (area of inner duct 44 and annular duct 48) is based in part upon optimum pressure-pumping considerations rather than size.
  • the nozzles must produce sufficient aspirating pressure to inflate the object to its desired pressure and this pressure is arrived at primarily as a function of crosssectional area.
  • the desired pressure for the first stage at an aspirating fluid flow rate of 1.5 1b.m./sec. is 2.5 p.s.i.a. and requires a first stage area of 7 square inches.
  • the second stage about one-ninth of the cross-sectional area of the duct as shown in FIG. 9 is occupied by the central spray cone or cones and eight-ninths of the area is occupied by the ring of spray cones. This balance is desired to be maintained in the first stage.
  • the first is the desired cross-sectional sectional area, for the preferred form 7 square inches, and the other is the maintenance of balance such that eight-ninths of the flow will occur through the annular duct 48 of the first stage and one-ninth will occur through the inner duct 44.
  • the desired cross-sectional area of the first stage is to be 7 square inches
  • eight-ninths of this or 6.2 square inches must be the cross-sectional area of the annular duct 48 and 0.8 square inches must be the cross-sectional area of the inner tube 44.
  • the diameter of the inner tube using must be approximately equal to or approximately 1 inch.
  • an aspirator including a first passageway that is outwardly bounded by a first tubular wall, means for establishing a flow of fluid generally axially through said first passageway, and a second tubular wall spaced radially outwardly from said first tubular wall, said tubular walls together forming an aspirated fluid passageway radially between them, said passageway having an ambient air inlet and an outlet positioned to discharge the aspirated fluid into admixture with the fluid flowing through said first passageway, the improvement comprising:
  • a check valve comprising a flexible tubular sleeve having an upstream end, support means extending about said upstream end and normally supporting said upstream end tight against said second tubular wall, and additional support means normally holding said sleeve against said second tubular wall along a plurality of circumferentially spaced-apart lines extending generally axially rearwardly from said forward end, with said sleeve being sized to lie substantially tight against said second tubular wall when ambient air is flowing inwardly through said aspirated air passageway, and with said sleeve being substantially unrestrained rearwardly of said upstream end support means and between said additional support means, so that backflow through said aspirated air passageway will move the unrestrained portions of said sleeve radially inwardly and will hold downstream end parts thereof tightly against said first tubular wall.
  • said additional support means comprises radial support plates extending between said first and second tubular walls in axial planes.
  • the support means for the upstream end of said sleeve includes a resilient band, and means securing said band to said second tubular wall at points in common axial planes with said additional support means, said resilient band having sufficient elasticity to hold the entire upstream end of said sleeve outwardly against said second tubular wall during one level of back pressure within the aspirator but being deformable inwardly between said securement points to disengage the sleeve from said duct inner wall at a higher level of back pressure, so that said sleeve-type check valve also functions as an overpressure relief valve.
  • said additional support means comprises radial support plates extending between said first and second tubular walls in axial planes.
  • a successive entrainment aspirator comprising;
  • a first wall forming a first primary flow passageway having an inlet in communication with ambient air
  • injector means arranged to introduce an aspirating fluid into said first inlet, with said aspirating fluid serving to aspirate ambient air into said first passageway;
  • a fourth wall circumscribing said third wall and being spaced radially therefrom to form an annular second secondary flow passageway having an inlet in communication with ambient air, and with said fourth wall extending downstream a substantial distance downstream of the other walls, so as to form a large diameter total flow passageway downstream of the other said passageway;
  • second injector means arranged to introduce an aspirating fluid into said second primary flow passageway, with said aspirating fluid serving to aspirate ambient air into said second primary flow passageway, and with flow through said primary flow passageways serving to aspirate ambicnt air into said secondary flow passageways;
  • check valve means in said annular first and second secondary flow passageways, for precluding backflow of fluids through such secondary flow passageways.
  • valve means each includes a flexible, cylindrical sleeve having its upstream peripheral edge substantially sealed against the outer wall of its respective passageway and its downstream edge secured at spaced points also to said respective outer walls.
  • an inlet assembly for an inflatable including wall means defining an ambient air inlet passageway for the inflatable, and nozzle means for injecting an aspirating fluid into and through said passageway, for entraining ambient air into said inflatable, the improvement comprising:
  • said wall means including a radially movable wall section which initially occupies a flow bounding position in which the ambient air passageway is substantially completely open to ambient air and the flow rate of ambient air into the inflatable is relatively large, the said wall section hav ing an outer surface in position to be subjected to back pressure within said inflatable so that when back pressure reaches a predetermined level it forces the movable wall section radially inwardly into a position reducing the size of the ambient air passageway, and means for limiting the extent of radially inward movement of said wall section so that when said wall section is in a radially inward position it blocks flow through an outer region of the ambient air passageway but a reduced size inner flow path remains which is sized to function effectively with said nozzle means for pumping ambient air into the inflatable at a decreased flow rate but at a higher pressure.
  • An inlet member for an inflatable object comprising:
  • central nozzle means arranged at the upstream end of said duct for injecting at least one generally central, generally conical jet along the longitudinal axis of said duct;
  • annular array of additional nozzle means arranged equidistantly around said longitudinal axis between said duct inner boundary and said central nozzle means for injecting a plurality of outer, generally conical jets around said central jet, said additional nozzle means being positioned inwardly of said duct inner boundary about onethird of the radius of said duct and said central and outer jets generally intersecting one another at a location along said duct whereat the outer jets engage the inner boundary of the duct, said location of intersection being spaced longitudinally from said nozzles a distance equal to about 6 to 9 times the diameter of the duct divided by the number of diametrically arranged conical jets at said point of intersection; and
  • valve means for preventing unwanted backflow from the inflatable object through said inlet member when the inflatable object is inflated.
  • An inlet member for an inflatable object comprising:
  • central nozzle means arranged at the upstream end of said duct for injecting at least one generally central, generally conical jet along the longitudinal axis of said duct;
  • annular array of additional nozzle means arranged equidistantly around said longitudinal axis between said duct inner boundary and said central nozzle means for injecting a plurality of outer, generally conical jets around said central jet;
  • wall means forming an inner first-entrainment duct and an outer annular first-entrainment duct each aligned respectively with said central nozzle means and said additional nozzle means, said inner duct and said outer annular duct forming a first second-entrainment passageway therebetween and said outer annular duct and said cylindrical duct forming a second second-entrainment passageway therebetween, and means for sealing said passageways against a backflow;
  • valve means for preventing unwanted backflow from the inflatable object through said inlet member when the inflatable object is inflated.
  • central nozzle means includes at least three equidistantly spaced nozzles.
  • a successive entrainment inflation aspirator comprising an inlet tube for an inflatable, said tube having inlet and outlet ends;
  • valve means in said inlet tube for completely closing same and preventing outflow from the inflatable
  • wall means in said inlet tube dividing the interior of the inlet portion of said inlet tube into at least one first-entrainment passageway and at least one second-entrainment passageway each of which is in communication with am bient air, said first-entrainment passageway surrounding said secondentrainment passageway;
  • nozzle means arranged to inject an aspirating fluid through said first-entrainment passageway, with said aspirating fluid and the ambient air entrained thereby serving as an aspirating fluid for said second-entrainment passageway
  • said nozzle means comprising a circular array of nozzles directed to discharge axially of the first-entrainment passageway;
  • valve means in said second-entrainment passageway for disabling it independently of said first-entrainment passageway.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Safety Valves (AREA)
  • Massaging Devices (AREA)
US853647A 1969-08-28 1969-08-28 Method and apparatus for aspirating fluids Expired - Lifetime US3640645A (en)

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US3791764A (en) * 1972-03-01 1974-02-12 Garrett Corp Variable area ratio jet pump
US3868125A (en) * 1973-04-09 1975-02-25 Atlantic Res Corp Inflation system for vehicle crash bag
US4212594A (en) * 1978-07-24 1980-07-15 General Electric Company Liquid feeding and mixing arrangement including an ejector thermal sleeve
US4247262A (en) * 1978-12-26 1981-01-27 General Electric Company Liquid feeding and mixing arrangement including a flow-shielding ejector thermal sleeve
US4566862A (en) * 1982-02-23 1986-01-28 General Pneumatics Corporation Fluid apparatus and methods, as for inflating inflatable structures
US5002465A (en) * 1989-10-12 1991-03-26 The Boeing Company Off-on control for an inflation aspirator
US5628623A (en) * 1993-02-12 1997-05-13 Skaggs; Bill D. Fluid jet ejector and ejection method
US5810563A (en) * 1992-08-06 1998-09-22 Volkmann; Thilo Ejector pump having flow directing profiles
US6017195A (en) * 1993-02-12 2000-01-25 Skaggs; Bill D. Fluid jet ejector and ejection method
EP1972796A1 (en) * 2007-03-21 2008-09-24 Honeywell Normalair-Garrett (Holdings) Limited Jet pump apparatus
WO2008134808A1 (en) * 2007-05-07 2008-11-13 Ian Dracup Doig Duckbill type check valve with curved and resiliently biased closing seal
US20100202899A1 (en) * 2009-02-06 2010-08-12 Mcneil Daniel A Aspirators
US9863442B2 (en) 2015-07-17 2018-01-09 Goodrich Corporation Collapsible/extendable aspirator system
EP3323729A1 (en) * 2016-11-21 2018-05-23 Goodrich Corporation Aspirator assembly with integrated pressure relief valve
US10167087B2 (en) * 2016-04-15 2019-01-01 Goodrich Corporation Collapsible inflatable aspirator system
US11198514B2 (en) * 2019-08-19 2021-12-14 Goodrich Corporation Aspirator with pressure relief flaps
US11333174B2 (en) * 2017-07-06 2022-05-17 Altevac, Llc High efficiency aspirator for inflatable emergency slides
US11358157B2 (en) * 2019-06-28 2022-06-14 Goodrich Corporation Pressure regulator for inflation systems

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55290U (enrdf_load_stackoverflow) * 1979-06-04 1980-01-05
GB2346198B (en) * 1999-01-25 2002-12-18 Aco Technologies Plc Non-return device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US784488A (en) * 1904-05-20 1905-03-07 Charles E Googins Steam-blower.
US1026399A (en) * 1910-01-19 1912-05-14 Schutte & Koerting Company Injector.
US2735261A (en) * 1956-02-21 Blast director for fluid streams
US3370784A (en) * 1966-02-14 1968-02-27 Ind Covers Inc Inflation aspirator
US3460746A (en) * 1967-10-27 1969-08-12 Rocket Research Corp Two-stage inflation aspirator
US3460747A (en) * 1968-11-05 1969-08-12 Rocket Research Corp Inflation method and apparatus

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB847055A (en) * 1957-08-09 1960-09-07 Ver Armaturen Gmbh Improvements in or relating to fluid flow control valves

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2735261A (en) * 1956-02-21 Blast director for fluid streams
US784488A (en) * 1904-05-20 1905-03-07 Charles E Googins Steam-blower.
US1026399A (en) * 1910-01-19 1912-05-14 Schutte & Koerting Company Injector.
US3370784A (en) * 1966-02-14 1968-02-27 Ind Covers Inc Inflation aspirator
US3460746A (en) * 1967-10-27 1969-08-12 Rocket Research Corp Two-stage inflation aspirator
US3460747A (en) * 1968-11-05 1969-08-12 Rocket Research Corp Inflation method and apparatus

Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3791764A (en) * 1972-03-01 1974-02-12 Garrett Corp Variable area ratio jet pump
US3868125A (en) * 1973-04-09 1975-02-25 Atlantic Res Corp Inflation system for vehicle crash bag
US4212594A (en) * 1978-07-24 1980-07-15 General Electric Company Liquid feeding and mixing arrangement including an ejector thermal sleeve
US4247262A (en) * 1978-12-26 1981-01-27 General Electric Company Liquid feeding and mixing arrangement including a flow-shielding ejector thermal sleeve
US4566862A (en) * 1982-02-23 1986-01-28 General Pneumatics Corporation Fluid apparatus and methods, as for inflating inflatable structures
US5002465A (en) * 1989-10-12 1991-03-26 The Boeing Company Off-on control for an inflation aspirator
US5810563A (en) * 1992-08-06 1998-09-22 Volkmann; Thilo Ejector pump having flow directing profiles
US5628623A (en) * 1993-02-12 1997-05-13 Skaggs; Bill D. Fluid jet ejector and ejection method
US5931643A (en) * 1993-02-12 1999-08-03 Skaggs; Bill D. Fluid jet ejector with primary fluid recirculation means
US6017195A (en) * 1993-02-12 2000-01-25 Skaggs; Bill D. Fluid jet ejector and ejection method
EP1972796A1 (en) * 2007-03-21 2008-09-24 Honeywell Normalair-Garrett (Holdings) Limited Jet pump apparatus
US20080247881A1 (en) * 2007-03-21 2008-10-09 Honeywell Nomalair-Garrett (Holdings) Limited Jet pump apparatus
US8985966B2 (en) 2007-03-21 2015-03-24 Honeywell Nomalair-Garrett (Holdings) Limited Jet pump apparatus
US8465264B2 (en) 2007-03-21 2013-06-18 Honeywell Nomalair-Garrett (Holdings) Jet pump apparatus
US8141587B2 (en) 2007-05-07 2012-03-27 Ian Doig Duckbill type check valve with curved and resiliently biased closing seal
US20100288373A1 (en) * 2007-05-07 2010-11-18 Ian Doig Duckbill type check valve with curved and resiliently biased closing seal
WO2008134808A1 (en) * 2007-05-07 2008-11-13 Ian Dracup Doig Duckbill type check valve with curved and resiliently biased closing seal
CN101675281B (zh) * 2007-05-07 2011-11-16 艾安·德拉库普·多伊格 带有弯曲和弹性偏压闭合密封的鸭嘴型单向阀
US8322996B2 (en) * 2009-02-06 2012-12-04 Air Cruisers Company Aspirators with bodies comprising wound filaments
US20100202899A1 (en) * 2009-02-06 2010-08-12 Mcneil Daniel A Aspirators
US10619651B2 (en) 2015-07-17 2020-04-14 Goodrich Corporation Collapsible/ extendable aspirator system
US9863442B2 (en) 2015-07-17 2018-01-09 Goodrich Corporation Collapsible/extendable aspirator system
US10780986B2 (en) 2016-04-15 2020-09-22 Goodrich Corporation Collapsible inflatable aspirator system
US10167087B2 (en) * 2016-04-15 2019-01-01 Goodrich Corporation Collapsible inflatable aspirator system
US10384789B2 (en) 2016-11-21 2019-08-20 Goodrich Corporation Aspirator assembly with integrated pressure relief valve
EP3323729A1 (en) * 2016-11-21 2018-05-23 Goodrich Corporation Aspirator assembly with integrated pressure relief valve
US11333174B2 (en) * 2017-07-06 2022-05-17 Altevac, Llc High efficiency aspirator for inflatable emergency slides
US11608838B2 (en) 2017-07-06 2023-03-21 Altevac Llc High efficiency aspirator for inflatable emergency slides
US20230193928A1 (en) * 2017-07-06 2023-06-22 Allevac, LLC High efficiency aspirator for inflatable emergency slides
US12018702B2 (en) * 2017-07-06 2024-06-25 Altevac Llc High efficiency aspirator for inflatable emergency slides
US20240337275A1 (en) * 2017-07-06 2024-10-10 Altevac, Llc High efficiency aspirator for inflatable emergency slides
US12305669B2 (en) * 2017-07-06 2025-05-20 Altevac Llc High efficiency aspirator for inflatable emergency slides
US11358157B2 (en) * 2019-06-28 2022-06-14 Goodrich Corporation Pressure regulator for inflation systems
US11198514B2 (en) * 2019-08-19 2021-12-14 Goodrich Corporation Aspirator with pressure relief flaps

Also Published As

Publication number Publication date
JPS5117725B1 (enrdf_load_stackoverflow) 1976-06-04
DE2042575A1 (de) 1971-03-11
FR2060130B1 (enrdf_load_stackoverflow) 1974-03-22
FR2060130A1 (enrdf_load_stackoverflow) 1971-06-11
GB1327424A (en) 1973-08-22

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