USRE31592E - Method and apparatus for operating a water-jet pump - Google Patents

Method and apparatus for operating a water-jet pump Download PDF

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Publication number
USRE31592E
USRE31592E US06/409,482 US40948282A USRE31592E US RE31592 E USRE31592 E US RE31592E US 40948282 A US40948282 A US 40948282A US RE31592 E USRE31592 E US RE31592E
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United States
Prior art keywords
water
ejecting
receptacles
compressed air
air
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Expired - Lifetime
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US06/409,482
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English (en)
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Siegfried Heilenz
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
    • F25B9/004—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant being air
    • 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
    • F04F1/00—Pumps using positively or negatively pressurised fluid medium acting directly on the liquid to be pumped
    • F04F1/06—Pumps using positively or negatively pressurised fluid medium acting directly on the liquid to be pumped the fluid medium acting on the surface of the liquid to be pumped
    • F04F1/10—Pumps using positively or negatively pressurised fluid medium acting directly on the liquid to be pumped the fluid medium acting on the surface of the liquid to be pumped of multiple type, e.g. with two or more units in parallel
    • 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
    • F04F5/02—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being liquid
    • F04F5/04—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being liquid displacing elastic fluids

Definitions

  • the invention relates to a method for operating a water-jet pump, in which the water which is needed for the operation of the pump is recirculated in a cycle.
  • Water-jet pumps are for example used extensively in laboratories, for example for drying of substances or for evaporating of solutions at a low temperature, through which a thermal load on the substances to be treated is avoided.
  • Water-jet pumps have the advantage that they are built very simply, practically have no wear and are practically insensitive against corrosion, if they are, as common, manufactured of glass or of plastic.
  • a moderate vacuum can be produced without difficulties with water-jet pumps in the range of between 100 mm. mercury column and 15 mm. mercury column, which is sufficient for many laboratory purposes.
  • the pressure reachable depends strongly on the temperature of the operating water, since the pressure can never be less than the steam pressure of the operating water, which increases with an increase in the temperature of the operating water.
  • the operating water heats up relatively quickly in a recirculating system, so that the suction capacity of the water-jet pump is less than with a constant supply of fresh water. If one still wants to achieve lower temperatures, then the operating water must be cooled with special cooling devices. In this case, a complex apparatus with many electrical connections is the result.
  • the purpose of the invention is to provide a method of the above-mentioned type such that electrical installations are not needed and still a cooling of the operating water is achieved.
  • an advantageous apparatus for carrying out the method is also to be created.
  • the water being pressurized by means of compressed air at a substantially constant air pressure and by the compressed air, which was used for driving water out through the water-jet pump, being expanded, i.e. allowed to drop in pressure, in a defined let-down, or expansion, space, wherein heat is withdrawn from the water, which is absorbed from the air during and after its expansion.
  • compressed air is used for recirculating the water.
  • Compressed air connections are generally at every work station in modern laboratories, so that setting up a special compressor is not needed.
  • the air does not drop in pressure during the driving out of the water, so that a constant water pressure exists at all times at the water-jet pump and thus a constant suction level, or rate, exists.
  • the compressed air has fulfilled its driving-out function, it is used inventively to cool the operating water to be recirculated.
  • the expansion of the air which after the driving out is still under high pressure, greatly cools the air. This cooling off is utilized to withdraw heat from the operating water.
  • the withdrawal of heat from the water can be effected by recirculating water around the expansion vessel, for example by arranging it in a water bath in an outer container.
  • a particularly good efficiency is achieved, however, if the expanding air comes directly into contact with the water to be cooled, which can be achieved easily by introducing water through a nozzle into an expansion vessel, which water is then torn into droplets through the expanding air.
  • the arrangement of the ejecting receptacle and of the expansion vessel in an outer container has the advantage that pipelines are hardly needed, since the ejecting receptacles can be filled directly from the outer container.
  • the static pressure in the outer container effects a filling of the ejecting receptacles by which special filling means for filling the ejecting receptacles are avoided.
  • a particularly simple means for the alternate connection of the ejecting receptacles to the water-jet pump employs a slide valve driven by the water leaving the ejecting receptacles.
  • the piston of the slide valve is moved quickly by the pressure in the other receptacle, so that the emptied receptacle is closed off and now the receptacle which is under pressure is connected to the water-jet pump.
  • a reversing mechanism permits, with the simplest means, an automatic continuous operation of the apparatus such that the water-jet pump is supplied uninterruptedly with operating water.
  • a particularly advantageous type of construction is obtained if one combines the compressed air lines and valves and water channels in a control plate, which is utilized at the same time for holding the ejecting receptacles and expansion vessel in the outer container.
  • the alternate filling and emptying of the ejecting receptacles can be controlled also with a time-dependent control, through which after a pregiven, preferably adjustable time interval a switching over from one driving-out vessel to the other one takes place, whereby the time interval is chosen such that the switching over takes place for sure prior to the ejecting receptacle, which is emptying, becoming totally empty.
  • FIG. 1 is a top view of an inventive apparatus
  • FIG. 2 is a cross-sectional view along the line II--II of FIG. 1, wherein also a control slide valve for compressed air is cut,
  • FIG. 3 is a cross-sectional view along the line III--III of FIG. 1, wherein the cross-section plane also intersects the reversing mechanism for the reversal of the compressed air flow,
  • FIG. 4 is a cross-sectional view along the line IV--IV of FIG. 1, wherein also the reversing mechanism for the water flow is included in the cross section,
  • FIG. 5 is a horizontal cross-sectional view along the line V--V of FIG. 2, wherein air channels for supplying of compressed air to ejecting receptacles are included in the cross section,
  • FIG. 6 is a cross-sectional view along the line VI--VI of FIG. 2, wherein the channels for supplying of compressed air from the ejecting receptacles to the let-down vessel are included in the cross section,
  • FIG. 7 is a cross-sectional view along the line VII--VII of FIG. 2,
  • FIG. 8 is a view which corresponds with FIG. 1, but of a modified embodiment in which the let-down vessel is arranged above the water filling, and
  • FIG. 9 is a view which corresponds to FIG. 4, but of the embodiment according to FIG. 8.
  • the main parts of the apparatus are an outer container 1, two ejecting receptacles 2 and 3, a let-down (i.e. expansion) vessel 4, a compressed air control slide valve 5 with an associated reversing mechanism, which as a whole is identified with reference numeral 6, a reversing piston 7 for reversing the water flow and two water-jet pumps 8 and 9. Said main parts, and further parts, and the cooperation of the parts of the apparatus will be discussed in detail hereinafter.
  • the outer container 1 has, as is shown in FIG. 1, a rectangular top view and a relatively high height (see FIG. 2) compared with its top view.
  • the outer container can for example be of plastic.
  • Ledges 10, 11 and 12 are built into the box bottom, onto which ledges the receptacles 2, 3 and 4 are mounted, so that said receptacles are spaced from the bottom 13 of the container 1.
  • a water-discharge opening 14 is arranged near the bottom 13, which opening is closed off by means of a plug 15.
  • the ejecting receptacles 2 and 3 have a cylindrical shape and are closed off on top by a lid 16 and on the bottom by a screwed-on bottom 17. Both receptacles are constructed alike and are discussed in connection with the example of the receptacle 2.
  • the valve cap is pivotal about a horizontal axis 20 and has a packing coating 21.
  • a small edge 22 which surrounds the opening 18 serves as a packing seat for the valve cap.
  • a float 23 is arranged in each of the receptacles 2 and 3, which float is vertically movable in a cage 24.
  • the cage 24 has holes 24a, so that its inside communicates with the inside 25 of the ejecting cylinder.
  • a conical valve 26 is provided on the upper side of the float 23, which conical valve cooperates with a valve seat 27, which is provided on the lower end of the control pipeline 28, which is guided through the lid 16 into the inside 25 of the ejecting receptacle.
  • the let-down vessel 4 is of a good heat-conducting material, for example of a rust-free steel, and carries ribs 4a on its outside. Baffle plates are arranged inside of the let-down vessel, which plates are for example cross plates 29 and 30, which force air entering the let-down vessel to detour, so that a sound-muffling effect will occur.
  • An exhaust pipe 31 which projects upwardly is provided on the ceiling of the let-down vessel 4.
  • the air which is supposed to be expanded is forced through the built-in baffle plates to flow through the let-down vessel first downwardly and then upwardly.
  • the receptacles 2, 3 and 4 are held in the container by a control plate which as a whole is identified with reference numeral 32.
  • Said control plate lies on the upper sides of the receptacles 2, 3 and 4 and is secured against a lifting upwardly by means of holding elements 33 and 34.
  • Various openings are provided in said control plate.
  • the already mentioned rotary slide valve 5 is supported in the control plate.
  • the control plate receives the reversing piston 7, as is shown in the cross section of FIG. 4.
  • the rotary slide valve 5 has a cylindrical member, in which are provided two angular channels 35 and 36 (FIGS. 5 and 6) axially spaced from one another. At the height of the angular channel 35 (FIG. 5) three channels 37, 38 and 39 are arranged in the control plate 32.
  • the channel 38 has a vertical section 38a, which leads to a compressed air connection 40 (FIG. 1).
  • the channel 37 leads from the opening 41, in which the rotary slide valve 5 is supported, through a vertical section 37a into the ejecting receptacle 2.
  • the channel 39 lies symmetrically to the channel 37 and leads into the ejecting receptacle 3.
  • the compressed air connection 40 communicates with the ejecting receptacle 3. After a rotation of the rotary slide valve 5 in clockwise direction at 90°, the ejecting receptacle 2 is connected to the compressed air connection 40.
  • the ejecting receptacle 2 In the plane of the angular opening 36 (FIG. 6) there are provided in the control plate three channels 42, 43 and 44. In the position which is illustrated in FIG. 6, the ejecting receptacle 2 is connected through a vertical section 42a of the opening 42, the angular opening 36 in the rotary slide valve 5 and the opening 44, which also has a vertical section 44a, to the let-down vessel 4. After a rotation of the rotary slide valve at 90°, the ejecting receptacle 2 is uncoupled from the let-down vessel 4 and instead the ejecting receptacle 3 is coupled to the let-down vessel 4.
  • the openings 37, 39, 42 and 43 lie in the same vertical plane, so that also the mentioned vertical channel sections are in alignment. Said vertical channel sections are aligned with openings 45 in the end surfaces 16 of the ejecting receptacles. Valve balls 46 are provided below said openings, which balls consist of a material which is specifically lighter than water and which are each guided in a cage 47, which has cross bores 47a.
  • Standpipes 48 and 49 are arranged in the ejecting receptacles 2 and 3 (see FIG. 4). Said standpipes extend to the bottoms 17 and have sloped areas 48a at their ends.
  • the standpipes 48 and 49 extend fixedly through the lids 16 of the ejecting receptacles and communicate with angular channels 50 and 51 in the control plate 32.
  • the angular channels end axially in a cylinder 52, in which the piston 7 is movable.
  • Valve seats 53 and 54 are provided on the ends of the cylinder 52.
  • the piston 7, which acts at the same time as a valve disk, has packing edges 7a, 7b which can rest against the valve seats 53 and 54.
  • An opening 55 radially ends in the longitudinal center of the cylinder 52, which opening 55 (see FIG. 1) extends to the edge of the control plate 32.
  • a pipeline 56 is connected to the opening 55, which pipeline branches at its end into two pipelines 57 and 58, in which manual valves, or faucets, 59 and 60 are provided.
  • the pipelines 57, 58 lead to the water-jet pumps 8 and 9, on which suction connections 8a and 9a are provided, to which the receptacles which are to be evacuated are connected, for example through flexible hoses (not shown).
  • Two cylinders 61 and 62 are mounted on the control plate 32.
  • the above-mentioned compressed air lines 28 end in communication with the ends of the cylinder bores 61a and 62a.
  • a rod 63 extends between the two cylinders 61 and 62, the ends of which are constructed as pistons 64 and 65, which are fitted into the cylinder bores 61a and 62a.
  • a recess 66 is provided in the center of the rod, into which (see FIG. 1) engages an arm 67, which is connected fixedly to the rotary slide valve 5 and projects radially from the arm.
  • the apparatus operates as follows:
  • connection port 40 for the compressed air supply is, as schematically shown in FIG. 1, connected to a compressed air line C, in which a manual valve V is provided in front of said connection port and initially remains closed.
  • Receptacles R which are to be evacuated are connected to the water-jet pumps 8 and 9 through the connections 8a and 9a. If at least one of the manual valves 59 and 60 is opened, the device starts to operate, when the compressed air valve in front of the connection 40 is opened.
  • the ejecting receptacles 2 and 3 are also filled with water, whereby the valve caps 19 are opened by the static pressure of the water. If the connection to the let-down vessel 4 is opened, which is true for the ejecting receptacle 2, in the valve position shown in FIG. 6, the air contained in the ejecting receptacle can escape and it can fill up completely. Penetration of water into the air channels 37 and 39 is prevented by the valves 46, which through their buoyancy in the water are lifted and pressed against the opening in the cylinder lid 16. The other ejecting receptacle from which the air discharge is not possible, will not be able to fill up completely, since an air cushion remains in said vessel.
  • valve 5 In contrast to the showing in FIG. 5, the position of valve 5 is such that the compressed air flows into the ejecting receptacle 2.
  • the compressed air presses against the liquid surface and moves the water through the standpipe 48 (see FIG. 4) upwardly.
  • the water pressure presses the piston 7 against the valve seat 54 on the right and thus closes off the standpipe 49 of the other ejecting receptacle 3.
  • the water flows through the opening 55 to the water-jet pumps 8 and 9.
  • the water which is emitted by the water-jet pumps falls directly again into the outer container 1.
  • a connection opens between the ejecting receptacle 2 and the let-down vessel 4 through the channels 42, 36 and 44.
  • the compressed air which at the moment of the changing over is still under its full pressure of two atmospheres excess pressure (a releasing of the compressed air does not take place during ejection), now expands into the let-down vessel 4, whereby a strong cooling of the air occurs.
  • air noise is reduced through the sound-muffling effect of the let-down vessel 4.
  • the cold air absorbs heat from the water which washes totally around the receptacle 4, which causes the water to be kept at a low temperature.
  • the expanded air is discharged through the pipe 31.
  • the cylinder 62 is placed under pressure and the rod 63 is pushed to the left, after which again exists the situation at the beginning of the above-described operating sequence.
  • the other ejecting receptacle is filled through its bottom 17 due to the static pressure which exists in the outer container 1.
  • the supply openings 18 are chosen large, in order to assure a complete filling of the emptied ejecting receptacle at the relatively low static pressure, prior to emptying of the ejecting receptacle which under pressure is being emptied.
  • the water-discharge screw 15 is loosened during operation.
  • the ejecting receptacles 2 and 3 are then pumped empty automatically.
  • a continuous water change is not needed, since the water is being cooled at all times. Because of unavoidable contaminations, it is advantageous to change one time per day the water fill, which can be for example approximately 25 liters.
  • the let-down vessel which is here identified as a whole by reference numeral 70, is arranged horizontally above the water level.
  • the let-down vessel 70 is a cylindrical container, which can be of a metal.
  • Perforated sheet metal plates 71 are arranged in said vessel 70, of which plates some are illustrated in FIG. 9.
  • a water line 72 is connected to the end of the vessel 70, which end is on the right in the drawing.
  • the water line 72 branches off from pressure line 56 which leads to the water-jet pumps.
  • the water line 72 ends by means of a nozzle 73 in the vessel 70.
  • the jet direction of the nozzle 73 is directed at a right angle to the longitudinal direction of the vessel 70 and downwardly.
  • the air which exits from the ejecting receptacles 2, 3 is introduced into the vessel 70 through a line 74.
  • the line 74 has an outlet opening 74a, the axis of which extends parallel to the longitudinal direction of the vessel 70 and is arranged below the water-supply nozzle 73, but is laterally offset slightly to the right from same.
  • the device according to FIGS. 8 and 9 operates substantially in the same manner as the device according to FIGS. 1 to 7.
  • the main difference is that water is introduced into the let-down vessel 70.
  • the water is divided finely during spraying in under pressure, through tearing apart of the jet and through the impact onto the baffle plates 71.
  • a further division and distribution in the entire let-down vessel is effected by the air blasts which exit from the air-line port 74a.
  • the water is distributed on the perforated sheet-metal plates 71, which thus generally are coated by a film of water.
  • the water is ejected from the vessel 70 together with the air, through an exhaust line 75.
  • the outlet 75a of the exhaust line 75 ends above the water level 76 in the surrounding area and is directed downwardly.
  • the water level lies slightly lower than in the embodiment of FIGS. 1 to 7.
  • a horizontal part 75b of the exhaust line 75 extends through the wall of the vessel 70 at the lowest point therein. This assures that no water can accumulate in the

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Thermal Sciences (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Compressor (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US06/409,482 1978-11-18 1982-08-19 Method and apparatus for operating a water-jet pump Expired - Lifetime USRE31592E (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19782850142 DE2850142A1 (de) 1978-11-18 1978-11-18 Verfahren und vorrichtung zum betrieb einer wasserstrahlpumpe
DE2850142 1978-11-18

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US06/095,132 Reissue US4310287A (en) 1979-11-16 1979-11-16 Method and apparatus for operating a water-jet pump

Publications (1)

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USRE31592E true USRE31592E (en) 1984-05-29

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ID=6055056

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Application Number Title Priority Date Filing Date
US06/409,482 Expired - Lifetime USRE31592E (en) 1978-11-18 1982-08-19 Method and apparatus for operating a water-jet pump

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US (1) USRE31592E (de)
EP (1) EP0011286B1 (de)
JP (1) JPS5572700A (de)
AT (1) ATE494T1 (de)
DE (2) DE2850142A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6817837B2 (en) 2002-07-19 2004-11-16 Walker-Dawson Interest, Inc. Jet pump with recirculating motive fluid

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3433401A1 (de) * 1984-09-12 1986-03-20 Basf Ag, 6700 Ludwigshafen Verfahren zur herstellung von unterdruck in apparaten bei der herstellung von phthalsaeureanhydrid und maleinsaeureanhydrid
GB2484345A (en) * 2010-10-08 2012-04-11 Thermofluids Ltd Oscillating U-tube pump.
US8881499B2 (en) 2011-05-12 2014-11-11 Saigeworks, Llc Under water hydrogen and oxygen powered hydraulic impulse engine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US475111A (en) * 1892-05-17 Hydraulic air-compressor
AT75041B (de) * 1914-07-04 1918-12-10 Kaelteindustrie M B H Ges Vorrichtung zum Absaugen und Fördern des Kondensates und der Luft aus Kondensatoren.
US2249621A (en) * 1938-04-13 1941-07-15 Schlumbohm Peter Method of and apparatus for air conditioning
US2702664A (en) * 1950-07-31 1955-02-22 Pienaar Theunis Marthin Snyman Air, gas, or like fluid compressor

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR300797A (de) * 1900-01-01
DE120159C (de) *
US1327560A (en) * 1918-09-16 1920-01-06 Hutchinson Job Means for cooling liquids
CH97705A (de) * 1921-08-19 1923-02-01 Broggi Vinzenz Mit Druckluft zu betätigende Pumpe.
US2243507A (en) * 1938-12-06 1941-05-27 Neumann Herman Frederik Marcus Displacement pump
US2410354A (en) * 1945-02-17 1946-10-29 Joseph B Meyer Fluid pressure pump
DE1530560A1 (de) * 1965-04-13 1970-01-08 Daimler Benz Ag Fahrzeugkuehlung
GB1345627A (en) * 1971-12-22 1974-01-30 Mcintyre T Prime movers

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US475111A (en) * 1892-05-17 Hydraulic air-compressor
AT75041B (de) * 1914-07-04 1918-12-10 Kaelteindustrie M B H Ges Vorrichtung zum Absaugen und Fördern des Kondensates und der Luft aus Kondensatoren.
US2249621A (en) * 1938-04-13 1941-07-15 Schlumbohm Peter Method of and apparatus for air conditioning
US2702664A (en) * 1950-07-31 1955-02-22 Pienaar Theunis Marthin Snyman Air, gas, or like fluid compressor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6817837B2 (en) 2002-07-19 2004-11-16 Walker-Dawson Interest, Inc. Jet pump with recirculating motive fluid

Also Published As

Publication number Publication date
EP0011286A1 (de) 1980-05-28
ATE494T1 (de) 1982-01-15
DE2961617D1 (en) 1982-02-11
DE2850142A1 (de) 1980-06-04
EP0011286B1 (de) 1981-12-23
JPS5572700A (en) 1980-05-31
JPH0122480B2 (de) 1989-04-26

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