DE2042575A1 - Method and device for sucking in a fluid - Google Patents

Description

Method and device for sucking in a fluid

The present invention relates to suction method and an air intake and more particularly to such devices which are suitable to rapid pressurizing inflatable objects.

A high rate of inflation is required for many inflatable objects, particularly those intended for emergencies such as Ifo slides and rafts.

Known aspirators that allow rapid inflation purposes of such devices have usually been made in two embodiments. The first executionaform consists of a suction device as described, for example, in US Pat. No. 2,859,908 (Neigel). An aspirating gas is called a high-speed stream in introduced a venturi nozzle, which the gas flow in the up-

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The upstream end of the nozzle is open to the ambient air and the gas stream flowing at high speed creates a suction effect to draw ambient air into the stream to increase the volume of the same When a standstill has come, a check valve in the nozzle is closed by the back pressure ₉ to prevent gas from escaping

A second embodiment of an inflatable aspirator is shown in U.S. Patent 2,772,829 (Crawford et al). This device is suitable in those facilities in which the combined flow of the suction gas and the sucked air, despite a high flow volume, has an insufficient bridge to completely inflate the device. Babei a check valve is provided which is closed by the Hickdruck if the bridge in the inflated lä direction dm & bridging the air and gas flow reaches "Bas suction of the ambient air is then terminated; however, the gas flow is maintained which, being of a higher bridge than the device's $ asd la, continues to inflate.

An improved flare method and apparatus are in U.S. Patents 3,460? 46 and 3,460? 4y described by the applicant. In these applications, the gases are drawn in through two stages. The first stage works with a low bridge and a high volume »around the facility to bring to a low pressure level very quickly. When this low bridge is reached, the second step is reached by the action of the back pressure against an annular check valve switched off and the further filling takes place with a reduced volume but a higher bridge through the first stage the aspirator alone.

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Summary of the invention

The invention relates to the suction of fluids and in particular, although not necessarily limited to the drawing of fluids to inflate a device.

One feature of the invention consists of a sleeve-like structure Check valve, which prevents a backflow from the second stage of the suction device. The sleeve speaks in wide range and is self-sealing. In addition, is they are simple, structured and cheap to manufacture - as well as in operation foolproof.

Another feature of the invention consists of a combined second-stage check valve and a pressure relief valve The sleeve-like check valve is suitable for such a dual use. That upstream located end of the sleeve is connected with an elastic band. The excess pressure is released by releasing the excess pressure the band flexes radially inward to close the seal between the forward end of the sleeve and the retaining wall for the sleeve interrupt.

Another feature of the invention consists in the measure reduce the overall length of the suction device by replacing a single nozzle with a number of injection nozzles be used. The nozzles are preferably arranged at two points, namely centrally and in an annular space around the longitudinal axis of the flow channel. Ea the sleeve-like check valve is attached to the wall of the suction device »it is for use in a combined multi-stage, Multi-nozzle suction device well suited. Through a combination of these hate speeches? Ir & sine aspirator shorter

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Maintain the overall length »which is easy to operate and a long one Can generate volume under high pressure or both for any number of applications

The invention is described below with reference to the drawings. Show it:

Fig. Λ a longitudinal section through a two-stage suction device, which uses a sleeve-like check valve W,

Fig. 2 is a vertical section along line 2-2 of the Fig. 1,

3 shows a graph of the pressure-flow characteristic the suction device,

4 shows a graph of the pressure-time characteristic a two-stage aspirator in which the time required to pressurize using a pressure relief valve compared to a usual suppression is shown without a pressure relief valve,

5 shows a longitudinal section of a multi-stage suction device, which uses a multiple nozzle injector,

FIG. 6 is a vertical section of that shown in FIG Injector along the line 6 - 6 in Fig. 5 *

FIG. 7 shows a (partial section in the longitudinal direction of that shown in FIG. 5 Suction device, the sleeve-like non-return valve being closed,

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Pig. 8 is a vertical section of that shown in FIG Suction device along the line 8 * 8 of Fig. 7 »

9 ei & e schematic position of the spray cone of FIG suction device shown in FIGS. 5 to 8,

Pig. 10 a schematic parposition of the inner tube longitudinally the arrows 10 - ■ 10 of Fig.9 and

Pig 11 * 12 and 13 isometric representations of a two-stage suction device, 11, the fluid is sucked in in both stages, while in FIG. 12 the second stage by moving the downstream radially inward Kente of the sleeve is closed, and wherein in Fig. 13 the excess pressure overcomes the elasticity of the elastic band, to seal the upstream edge of the sleeve.

Description of preferred embodiments

The suction device shown in Figures 1 and 2 includes a first stage 12 and a second stage 14. The first Stage has an inner channel 16 and an injector 18, which has a number of openings for supplying the suction fluid 19 owns. As in the aforementioned United States patent application (Green et al), the suction fluid preferably has a relatively high pressure on and consists of a cold gas, which is produced by a mixture of hot gases, for example the combustion products of a granular solid-state fuel composed of ammonium nitrate and a Electricity creates a cold, liquid coolant, for example a fluorine-substituted carbon dioxide liquefied under pressure. Other pressurized gas can also be used

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however, there is the advantage of the foregoing Ansaugfltiids in that this has no pressure drop characteristic has, which is very beneficial for inflation. The inner channel 16 is arranged centrally in the interior of an outer channel 20, which forms the outer wall with the suction device. Three equally spaced apart radial retaining plates or struts 22 rigidly connect the inner and outer channels. Purely the operation of the second stage will be Air through the inner channel 16 and the annular opening sucked in between the inner and outer channels. It is evident that the effective area of the second Stage is much larger than that of the first stage. In the preferred embodiment, the area ratio is 3 »85: 1» however, this ratio is determined by the requirements intended for the suction device and is therefore not included in the to understand the restrictive sense.

A check valve 24 ^ which as a cylindrical, flexible Sleeve 25 is made of vulcanized fabric or a similar material, serves to open the space between the inner and close off the outer canal if operation is restricted to the first stage. The cylindrical sleeve is ™ at its upstream end with a flexible, elastic band 26 connected. The belt works as a pressure relief valve, if so desired, and will be used later Position described in more detail. If the overpressure function is not required, the tape can be omitted and the upstream end of the sleeve 25 is immediate bonded to the inner surface of the outer channel 20, or the tape is made stiff enough to allow deflection to prevent. According to the preferred embodiment, dao Bond and dnmit the sleeve 25 to spaced apart Cleats next to the strut 22 by means of a suitable

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fastening device, for example by means of pins 28. The struts are at 30 in the region of the cylindrical Sleeve cut out so that the sleeve is located inside the struts and on three equidistant from each other lying points around the inner surface of the outer canal is jammed.

A main flap valve 22 is downstream of the inner one Channel 16 arranged and has a joint 34- through which a circular vulcanized fabric element 36 retain which is used to reinforce washers 38 Comprises aluminum or a similar material. Vie in the the aforementioned US patent application (Green et al) is executed, the main check valve 32 opens below the pressure of the inflowing fluid and remains open until. the pressure within the device to be inflated is sufficient, around the valve in the closed position shown in FIG bring to. An annular shoulder 39 is provided on the outer channel 20, which acts as a seat for the main Mickschlag valve serves.

While the second stage is being sucked in, the Sleeve 25 is substantially in a cylindrical state and lies tightly against the inner surface of the outer channel 20. Once as a result of the gas pressure in the inflated device, which is the pressure of the sucked in the second stage If a backflow begins, the strongest backflow occurs essentially along the inner surface of the outer channel 20. As a result, the backflowing gases capture the loose downstream hand of the sleeve between the struts 22 and move this hand radially inward. In this way, between the struts and radially against the inner channel 16 and the struts 22 circumferentially pockets

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educated. The closed position of the sleeve is shown in FIG. 2 shown in phantom, the sleeve in fact to the opposite surfaces of the struts and on the outer surface of the inner channel 16 rests.

An important feature of the invention is that a circumferential line drawn around the struts and the inner channel, the circumference of the sleeve and the circumference of the inner surface of the outer channel 20 are related to one another and ) this ratio can be adapted to the application of the suction device be changed «According to the preferred embodiment of the invention, it is desirable that the The circumference of the sleeve corresponds approximately to the circumference that is drawn around the struts and the inner channel and which fits snugly against the struts and the inner channel when this is closed *

For the same reason, it is desirable that the circumference of the sleeve approximately correspond to the circumference of the outer channel so that the sleeve fits snugly against the outer channel in the open position. There are many ways to essentially achieve this equality * One way consists in that "only the circumference of the inner channel or the thickness of the struts is changed. Another way is that additional elements or the like" are arranged on the inner channel in order to enlarge the circumference. According to the preferred embodiment, said equality is essentially achieved by using a preferred number of struts. According to the preferred embodiment, three struts are provided to achieve the said equality. The said equality results from the fact that the circumference of the inner surface of the outer channel is greater than the circumference of the The outer surface of the inner channel is by an amount which corresponds to the product 2 χ $, 14 16 χ ^K 2 ~ ^R 1 'νοο «ά Eg or iL die

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In other words, the difference in circumference between the outer channel and the inner channel is approximately 6.28 χ (Rp-R ^). If the circumference of the sleeve is as large as the circumference of the outer channel, additional material must be placed over the struts. The radial length of each strut corresponds of course to the amount (Ro-R,.) ♦ Since each strut has two opposite surfaces, these struts result in 6 χ (R ₂ -R ^). It can thus be seen that only the amount 0.28 χ (Ro-R ,,) remains as excess, which has to be distributed over the struts and the inner channel, ie the circumference of the struts plus the circumference of the inner channel corresponds to FIG required 6.28 χ (H ₂ -IL). The remaining amount of 0.28 χ (Rp-R / t) is applied equally around the struts and the inner channel and essentially results in a tight fit between the sleeve and the struts and the inner channel when the same is closed.

The principle of dividing the suction of fluid into the ufxubla & e-iide device into stages can best be seen in connection with FIG. 5 '. "The line between 3.2 (point A) on the horizontal coordinate and the value 2 (point B) on the vertical coordinate represents the flow rate of the fluid in the ublaoende device using the width. Stage of the suction device. In fact, the data represent a flow ratio between two, c / ii.ii i.uLu / itiäreni fluid, ie sucked fluid, and primary / IuId, ie anonugfluid; however, assuming hlxicsi- konctiiiiteri flow said Vorhi.iltxiii of primary fluid;. ujeimnite the flow in the inflated IÜnriclitung (I.'ii · Uiη between dom i'unkt 2.2 (point C) on dor horizontal coor-IFCE and 4.5 M Ci'unkfc ) on the vertical coordinate

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solid line represents the flow rate using exclusively represents the first stage of the suction device. It is easy to see that the second stage of the Suction device, although it generates a high volume of fluid emerging from the suction device, only a relative one can deliver low pressure during the first stage of the aspirator, even though it has a low flow rate supplies, can generate a much higher pressure. The combination of stages, being the second stage is interrupted when the pressure in the inflatable device approximately 0.063 at (0.9 psig) corresponding to the Reaching point E of the preferred embodiment provides a high flow rate initially and a last lower flow velocity, but a proportionate one high pressure. The slope of this curve is best represented by the solid line in FIG.

The design of the pressure relief valve is in Pig «1 and in the Representations of the EIg. 11 to 13 shown. The upstream end of the sleeve 30 is covered with the elastic band 26 tied together. The band has a circumference which is approximately corresponds to the inner surface of the outer channel 20, so that the sleeve is pressed into a sealing connection with the outer channel. According to Fig. 12, the sleeve is arranged in pockets; shown in order to prevent the backflow of the gases, if only the first stage is used. In Fig. 13 the pressure of the backflow overrides the pressure which is required to deform the tape so that the belt moves inwards and releases the excess pressure. During operation, the tape bends »if the desired one Pressure of the inflatable device is reached and swings back and forth between the opening and closing positions to keep up this pressure *

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By using the pressure relief valve shown or a similar one, an inflation method is created which uses a pressure source whose pressure is higher than that desired final pressure of the inflated device. Sas Procedure is best described in conjunction with 3sig 4, in which the dashed line between F and G represents the usual method of using a brackish water, the in its Haximaldruek approximately the desired inflation pressure is equivalent to. In the full line of this ilgur the use of the pressure relief valve is shown «at this curve is the second stage up to point P in operation, around the facility with a relatively constant low Pressure to fill »where when the pressure in the device rises and the second stage of the suction device closed ", the line becomes much bigger Slope to point H is longer than in the dashed line. Curve, since the pressure source for the full line has a pressure value that is significantly greater than that for the device to be inflated desired pressure. At point H at which the pressure relief valve, i.e. H. the band 26, 6 is opened » the pressure is released, the pressure relief valve between the open and closed position swings and the desired pressure of the device along the wavy line between the points H and G is maintained. In this way, the desired pressure reached earlier.

In the arrangement shown in Hg. 5 to 8, the suction device provided with an outer channel 42 and an inner channel 44. The suction device further comprises a SÜckschlagyentil 46, which is identical to the Süeksehlagventii 32 according to RLg. 1 is formed. In addition, owns the suction device according to KLg. 5 an annular channel 48 »which has an outer surface 49 and an inner surface 50. The inner channel and the annular channel are through

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Suitable struts 51t, which are constructed similarly to those in FIG. 1, are held in the outer channel. A number of centrally arranged nozzles 52 deliver suction fluid into the inner channel and communicates with the central nozzles 52 through a common bore. The nozzle ring injects suction fluid into the ring-shaped channel 48. Between the ring-shaped channel 48 and the outer channel 42, an outer, cylindrical, Milsen-type check valve 56 is provided. An inner, sleeve-like check valve 58 is arranged between the annular channel 48 and the inner channel 44. The valves 56 and 58 are identical and operate in the same way as the valve 24 shown in FIG. 1. The second stage is shown in operation in FIGS and the inner wall of the outer channel 42 abut. When the pressure in the inflatable device reaches a level sufficient to close the second stage VM , the back pressure moves a gas stream along the inner wall of the outer channel 42 and the inner surface 50 of the annular channel 48 to close the sleeves, as in FIG 7 and 8 is shown. Further suction is continued in the first stage until the desired pressure is reached in the device, at which point the back pressure of the gases deforms the elastic bands 60 and 61 so that they act as pressure relief valves. If the end state of inflation is reached, ie if the feed pressure drops to a value which is less than the pressure in the device to be inflated, the main non-return valve 46 is closed and the device remains fully inflated.

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In Fig. 1, a method is shown in principle "to reduce the overall length of the suction device without substantially to reduce the degree of suction of the device. In principle, through a nozzle, as for example in the embodiment according to the Pig. 5 to 6 is used, and which has a diameter in the range of 2.5 ^ - now, a spray is emitted in the form of a cone. It has been shown that an optimal mixture of the ejected from the nozzle Suction flow with the sucked in, surrounding the nozzle Air occurs along the circumferential surface of this cone » The cone angle of the cone can be determined by the ratio of the length of the spray cone at its point of intersection with the channel Diameter D of the channel can be determined and is preferably between 6 - 9 to 1 · This L / D ratio is determined the length of the intake duct, if a duct with a given diameter is desired. The diameter of the canal in the preferred embodiment according to FIGS. 5 to 8 is for example 152 mm (6 inches). To increase the L / D ratio It is therefore necessary to match the length of the channel 6-9x6 inches or a minimum of 915 mm (36 inches) amounts to. The use of such a long channel in an aircraft inflatable glider is impractical.

To shorten the effective length of the channel, a method is used according to which a series of nozzles or preferably a ring of nozzles is used in an annular space around the central dune or nozzle arrangement, as in ~ spielßweiae also Fig. 6 can be seen. The theoretical form the spray cone emerging from these nozzles is best in the Longitudinal section shown in Fig. 9 · Assuming one L / B ratio of 6 and oineo canal diameter fjGx ^ n of 152 mm (6 inches) can be seen from the ring of nozzles which surrounds a central nozzle or central nozzle 52, in axial Quernchni'jt results in a series of three spray cones,

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which respectively have the diameters & and dj and which Fill in the 152 mm diameter D of the duct. Each of these cones corresponds to a third of the diameter D of the channel at the respective contact points of the cones. Therefore ist.the canal is essentially filled, but has been the length L of the cone required to close the canal is reduced by a factor of 3 »so that the approximate length of the Channel using the multiple nozzle arrangement according to) Hg. 9 is only 304 mm (12 inches) · The optimal shape the spray jets emitted from the entrance space consists of an annular slot with a width of approximately 0.254 mm (10/1000 of an inch). The manufacture of a device having a slot of this size would lead to expensive flax, if it is possible at all. The alternative this therefore consists in the approximate arrangement of a Slot by inserting a nozzle ring 24 - according to the preferred embodiment is provided in which each nozzle has an orifice of approximately 1.78 mm (0.07 inches). It is It is obvious that a smaller number of larger nozzles can be used or that additional nozzles can be used Rings can be used.

The use of an annular row of nozzles to shorten a length is in the RLg. 5 to 10 and is also used to advantage in connection with the stage arrangement of the aspirator. In general, the desired channel area of the suction device for operation of the second stage, ie with the check valves 56 and 58 open, is determined by the limitation which is given by the use of the suction device. In the preferred embodiment, the knee area of the second stage is approximately 174 cm ² (27 squares or 11), which becomes the area of the first stage (the area of the inner channel 44 and the annular channel 48)

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sum 5? eil rather on considerations of a Pumpvorgängs at optimum pressure than on the size determined "Hit other words, ₉ it is known that the nozzle must generate sufficient Ansaugdruek to the establishment inflate to the desired pressure and this pressure is in the first Line determined as a function of the cross-sectional area. In a preferred embodiment according to the Pig. 5 his, the desired pressure for the first stage at an intake flow rate of 1.5 lb / second is 0.176 ata

2 and requires a first stage area of 45 Λ em (7 square inches). In the second stage, about 1/9 of the cross-sectional area of the channel according to FIG. 9 is taken up by the central spray cone or cones and 8/9 of the area is used up by the hanging of the spray cone. This ratio is desirable for the first stage. Two criteria are used to determine the shape of the first stage aspirator. The first criterion is the desired cross-sectional

area, which for the forthcoming completion is 45.1 cm and the second criterion is the maintenance of such a ratio ₅ that allows 8/9 of the flow through the annular channel 48 of the first stage and 1/9 through the inner channel 44. In other words, if the desired cross-sectional area of the first stage is 45 »1 cm * ¹ » then 8/9 of it or 40 cm ² ( _6t 2 square inches) of the cross-sectional area of the annular channel 48 and 5 »16 cm (0, 8 square inches) of the cross-sectional area of the inner ear 44. Using this ratio, it can be seen that the diameter of the inner

Rohres, namely d » \ j ^ k must correspond approximately to the vert l / or approximately 2.54 cm.

Another difficulty arises from the fact that the

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downstream ends of the inner channel 44 and the annular channel 43 the diameter of the spray cone in the annular Channel 48 are each approximately 12.7 mm (1/2 inch) as indicated by the reference numeral χ in FIG is · Therefore, at this point it would be along the length of the aspirator the diameter of a single spray cone in the inner bore 44 is also 12.7 mm. Because the required diameter of the inner cone, d. H. the diameter that meets the area requirement of 5 »16 cm (0.8 square inches), as stated above, is 2.54 cm, it is necessary to expand the diameter of the cone by using a number of central nozzles in the same Way as previously described to shorten the overall length of the suction device. It should be noted that the discussion of the L / D ratio related to the second stage took place, applies in the same way for the first stage, ie. Y / X according to FIG. 9 must also be approximately 6-9 to 1 »According to the preferred embodiment of the invention three nozzles are used to. at the downstream end of the first stage of the inner tube 44 an effective To obtain a diameter which has a diameter ·! ' from 2.54 cm. This, of course, creates an overlap of the spray cones at the downstream end of the second Stage, but this overlap does not affect the operation of the aspirator to any appreciable extent.

Further modifications of the invention are made in the light of the following This also includes claims.

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Claims (1)

64? August 27, 1970 P a t ent an s ρ r u c.h e Suction device with a first channel, which is outside is limited by a first pipe wall »with a device for maintaining a fluid flow in the essentially axially through said first channel »with a second drilling wall which is radially outward at a distance of the first pipe wall is arranged, said pipe walls together having a suction channel radially between them form, which has an inlet for training air and a Having an outlet which emits sucked fluid mixed with the fluid flowing through the first channel, characterized by a check valve, which consists of a flexible, tubular sleeve which is a downstream end, with a retainer disposed around the downstream end and normally the downstream end tight against the second drilling wall presses, with another holder, which normally the sleeve along a number of circumferentially spaced lines prints against the second wall, using the lines mentioned extending substantially axially rearwardly from the forward end of the sleeve, the sleeve being so sized is that it rests substantially tightly against the second drilling wall when ambient air passes inward through the Channel for the intake air flows »and the sleeve behind the upstream holder and between the additional holder is unimpeded, eo that a back flow through the duct for the intake air moves the unhindered sections of the sleeve radially inward and presses the downstream end portions of the sleeve feet against the first drilling wall " - 17 - 10 9.811 / 1462 W. 2. Suction device according to claim I _1, characterized in that the additional holder consists of radial retaining plates which extend between the first and the second pipe wall in axial planes * 3 »suction device according to claim 2, characterized in that that three retaining plates are provided. M-. Suction device according to claim 2, characterized in that "the holding plates are connected to the second drilling wall at points which are arranged behind the sleeve and that the holding plates are provided with recesses at their outer ends in the region of the sleeve, the EKiIsc between the recesses the retaining plates and the second pipe wall is clamped. 5 »suction device according to claim 1, characterized in that that the holder for the upstream end of the sleeve consists of an elastic band and that a device is provided to connect the band to the second pipe wall at points which lie in common axial planes with the additional holder, the elastic band having sufficient elasticity to cover the entire flow-like end of the To press the sleeve outwards against the second pipe wall, if a certain inside the suction device Back pressure value is present, and to be deformable inward between the attachment points to the sleeve to detach from the inner duct wall at a higher back pressure value, so that the sleeve-like non-return valve also works as a pressure relief valve. - 18 - 1O0811 / UB2 6. Suction device according to claim 5 »characterized in that that the additional holder consists of radial holding plates ", which are located between the first and second drilling wall extend in axial planes. 7 · Suction device according to claim 6, characterized in that » that three struts are provided as retaining plates and that the device for fastening the tape is an arrangement for fastening the tape to the struts 8. Multi-stage suction device, characterized by a first wall, which forms a first, primary flow channel that communicates with ambient air Has inlet, through an injector assembly which suction fluid is input into the first inlet, the suction fluid serving to draw ambient air into the first channel to suck in, with a second wall., which surrounds the first wall and is radially spaced therefrom to form a secondary flow channel with the first wall to form, which has an inlet in connection with ambient air, with a third wall »which surrounds the second wall and is radially spaced therefrom by a second, annular primary To form a flow channel therebetween, which has an inlet in connection with ambient air, with a fourth Wall which surrounds the third wall and is at a radial distance from this, around an annular second to form secondary flow channel, which has an inlet in connection with ambient air, wherein the fourth wall extending a substantial amount downstream of the other walls to provide a channel for to form the overall flow with a large diameter downstream of said other channel, with a second - "19- 1038 1 1 / H52- Injector device, through which suction fluid in the named, second primary flow channel is entered » wherein the suction fluid is used to draw ambient air into the second primary flow channel, and wherein the flow through said primary flow channels serves to bring ambient air into said secondary flow channels suction, and with a kickback device in said first and second secondary Flow channel to allow a return flow of fluid through the to prevent secondary flow channels. 9 * suction device according to claim 8, characterized in that that the valve arrangement in each case has a flexible, cylindrical sleeve «whose upstream unifangle-side Edge essentially sealing against the outer one Wall of the respective channel rests, while the downstream edge is located at a distance from one another Points is connected to the respective outer walls. 10. Suction device according to claim 9 »characterized by an elastic band, which at a distance from each other located. Places with the outer wall of said, third annular channel is connected and with the entire upstream, circumferential band of the sleeve is connected, making the band the upstream located, circumferential edge of the sleeve presses against said outer wall to said seal to form, but is pressed inwards to destroy the seal if a predetermined downstream of the sleeve desired pressure is reached 11 Suction device with short lengthways dimensions for vacuum - 20 - 109811 /.U52 647 set of inflatable devices, marked through a cylindrical duct having an inner wall, through a nozzle arrangement with ti ge, which is located upstream located end of the channel is arranged to a central, substantially conical spray jet to inject along the longitudinal axis of the channel, with an annular array of nozzles, which are equidistant is arranged from one another around the longitudinal axis between the inner duct wall and the central nozzle arrangement, to inject a number of outer, substantially conical sprays around the central spray. 12. Suction device according to claim 11, characterized in that said annular nozzle arrangement is approximately one Third of the radial extent of the channel is arranged offset inwardly from the inner wall of the channel and that the central and outer sprays essentially intersect at a point along the channel, at which the outer spray jets hit the wall of the channel, this intersection point in the longitudinal direction has a distance from said nozzle which is about 6 to 9 times the diameter of the channel cheats, divided by the number of diametrically arranged, conical spray jets at the point of intersection mentioned. Short-length suction device according to claim 11, characterized by a section belonging to the first stage, which has an inner channel and an outer, annular channel, each in alignment with the said central nozzle arrangement and to said annular nozzle arrangement are arranged, said inner channel and said outer »annular channel between them form a first channel and said channel - 21 - TQ9811 / U52 647 outer, annular channel and said inner wall of the cylindrical channel there is a second between them Form channel, and an arrangement is provided to protect these channels against backscatter from the inflatable Seal facility. . 14. A suction device according to claim 12, characterized in that the cross-sectional area of said s from it en annular channel is approximately eight times larger than the cross-sectional area of said inner channel * is · 15 · Suction device according to claim 11, characterized in that said central nozzle arrangement is at least three equally spaced from one another Has nozzles. 16. Suction device according to claim 15 »characterized in that the central nozzle arrangement is at least three in Kleichen has nozzles arranged at a distance from one another. 17. Suction device according to claim 13 »characterized in that the device for sealing the first and second channel has an inner and an outer, flexible, cylindrical sleeve 18 «. Suction device according to claim 13 *, characterized in that that the inner channel and said outer, annular channel in said cylindrical channel by struts are attached, which have recessed sections, and that the device for sealing the first and second channels has inner and outer flexible, cylindrical sleeves which are arranged in the recessed portions of the struts and which are attached to them - 22 - 109811 / U52 647 upstream circumferential bands, respectively sealingly abut the named annular channel and the named inner wall of the cylindrical channel » 19 · Suction device according to claim 17 »characterized in that that the upstream peripheral bands of the sleeves are connected with elastic bands, those at spaced apart locations on the annular channel and said inner wall of the cylindrical channel are attached, whereby these bands are said upstream, circumferential bands the inner and outer sleeves each against the said outer, annular channel and said inner wall of the. cylindrical channel press to form a seal to produce, but with the tapes facing inwards Solution of the seal can be printed when a predetermined pressure is achieved downstream of the sleeves. 20 · level suction device for inflating objects, characterized by a tubular inlet member having an inlet and an outlet end, wherein a valve device sum complete in the inlet element Closing the inlet element and to prevent a flow from the object to be inflated is present, with a wall arrangement on the inlet side of the valve assembly. which is the inside of the inlet area of the inlet pipe into at least one channel of the first stage and at least one channel of the second Level divided, each of which in connection with ambient air with a nozzle assembly for injecting suction fluid through the first stage channel, wherein suction fluid and the ambient air entrained thereby serving as suction fluid for the second stage duct, with ώ 23 - 1 09 8 "Μ / Λ 4 5 2-.. .- · * 647 a valve device in the channel of the second stage, through which this stage is independent of the channel of the first stage is switched off 21. Suction device according to claim 20, characterized in that the channel of the first stage surrounds the channel of the second stage and that the nozzle device consists of a row of nozzles arranged in a circle, which
Releases fluid axially to the channel of the second stage - 24- - 1 0 9 8 1 1 / U 5 2