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Pneumatic suction deviceRelated Patent Categories: Pumps, One Fluid Pumped By Contact Or Entrainment With Another, JetPneumatic suction device description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060153694, Pneumatic suction device. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] The present invention relates to a pneumatic suction device, that is to say powered by air pressure and the Venturi effect. [0002] Home, town, or industrial cleaning can be realized by means of more or less complex suction devices. But whatever the configuration selected, there are primarily two parameters to control, namely, the flow and the vacuum. These functional characteristics have to be adapted according to the application considered, and in particular this specific debris. [0003] One knows in particular the suction device, known as vacuum, in which one uses the expansion of a pressurized gas to create vacuum and, consequently, to generate a phenomenon of a suction. In practice, the gas under pressure is generally the compressed air coming from a factory feeder system or from an internal compressor, for example. [0004] Specifically, the compressed air is sent in a nozzle whose internal contour is adapted to generate, by the Venturi effect, a vacuum upstream of the most constricted section of the aforementioned nozzle when the compressed air slows downstream from the aforementioned section. This principle being known perfectly, it will not be described more here. One will recall simply that the flow and the vacuum depend, of course, on the form and dimensions of the nozzle, and in particular of its cross-section. In fact, with a large-sized nozzle, one will obtain a large volume of moved air but at the price of a relatively weak vacuum. To the contrary, with a nozzle of smaller size, there will be less flow but the vacuum will be then stronger. [0005] This type of pneumatic suction device presents, however the disadvantage of a source of energy that has stable and constant characteristics (pressure, flow). To have fixed functional characteristics which constitutes only one compromise is not well adapted to the considered application. Thus, in practice, one often finds oneself with a suction device with too little vacuum and having a good flow, or having the opposite problem. [0006] Also, the technical problem to solve, by the object of this invention, is to propose a pneumatic suction device comprising a nozzle, known as main, through which the expansion of a compressed gas is adapted to generate by an aspiration reaction a suction of given flow and vacuum, which pneumatic suction device makes it possible to avoid the problems of the state of the art by offering appreciably extended capacities of use, in particular to the level of the kind and consistency of these suctioned debris. [0007] The solution with the posed technical problem comprises, according to the present invention, in what the pneumatic suction device comprises, moreover, at least a secondary nozzle movable to be substituted for the main nozzle, through which the expansion of compressed gas is adapted to generate a suction of a lower flow and a higher vacuum respectively than the flow and the vacuum obtained with the main nozzle, and in that each coaxial secondary nozzle with the main nozzle is assembled to be moved between positions, passive in which the effective expansion of compressed gas is achieved in the main nozzle and an active position in which the effective expansion of compressed gas is achieved by the aforementioned secondary nozzle. [0008] One understands by effective expansion, that which is at the source of the suction generated inside the pneumatic suction device. [0009] For the displacement of each secondary nozzle, any mobility means can evidently be envisioned. [0010] The invention as it is defined presents the advantage of being able to vary the essential parameters of the suction according to the intended application, and in particular of the kind and/or the consistency of the product to be sucked up. [0011] Thus, the same pneumatic suction device is able to collect effectively, also well substances needing at the same time a high flow and a limited vacuum, for example, dust or powdery matter, and substances requiring to the contrary a high vacuum and a reduced flow, for example, liquids of any viscosity. [0012] The present invention also relates to the characteristics which will arise during the description which will follow, and which will have to be considered separately and according to all their possible technical combinations. [0013] This description given by way of nonrestrictive example will explain how the invention can be realized, in reference to the annexed drawings: [0014] FIG. 1 schematically represents a pneumatic suction device in conformity with the invention, in which the main nozzle is active. [0015] FIG. 2 is a similar diagram to that of FIG. 1, but in which the suction device's secondary nozzle is active. [0016] For reasons of clarity, like elements have been designated by identical reference numbers. Likewise, only the elements essential for the comprehension of the invention have been represented, and these, are diagramed without respect to scale. [0017] FIGS. 1 and 2 illustrate a pneumatic suction device 1 functioning on air compressed to approximately 6 to 7 bars, which is provided here by the intermediary of an inlet 2. One also discerns equally the traditional means of distribution 3 which are charged to regulate the compressed air which is going to be allowed into the pneumatic suction device 1, with a view in particular to control of the final level of vacuum for obvious safety reasons. In a traditional way, the pneumatic suction device 1 is equipped with a nozzle 10, known as the main, which is made so that the expansion of the compressed air through it can generate, by reaction, a suction of strong flow and limited vacuum in the recovery can 50. [0018] In accordance with the object of this invention, the pneumatic suction device 1 comprises, a secondary nozzle 20 which is made so that the expansion of the compressed air through it is able to generate, by a reaction, an suction of lesser flow but of greater vacuum. This secondary nozzle 20, coaxial to the main nozzle, in addition, is assembled so that it can move, between a passive position (FIG. 1) where it has the function of the expansion nozzle, and in which the effective expansion of the compressed air is carried out via the main nozzle 10, and an active position (FIG. 2), in which the effective expansion of the compressed air is carried out via the aforementioned secondary nozzle 20; the pressure of the compressed air is reduced by flowing through the rear channel 200 interdependent on the movements of the secondary nozzle. [0019] In this particular embodiment, only selected by way of example, the main nozzle 10 and the secondary nozzle 20 are coaxial. Moreover, the secondary nozzle 20 is can be moved through axial translation in relation to the main nozzle 10. But, of course, other relative positioning and other types of mobility could be considered. [0020] According to a characteristic of the invention, the pneumatic suction device 1 comprises, in addition, displacement means 30 which are arranged in a manner to be able to ensure the mobility of the secondary nozzle 20 between its passive position (FIG. 1) and its active position (FIG. 2), perfectly located to satisfy the "venturi" gas dynamics requirements. [0021] In a particularly advantageous way, the displacement means 30 comprise a pneumatic cylinder 31 which is able to move the secondary nozzle 20 between its passive position (FIG. 1) and its active position (FIG. 2) in which the aforementioned secondary nozzle is positioned respectively away from and appreciably inside the main nozzle. This characteristic to some extent makes it possible to neutralize the main nozzle 10 in a reversible way, while coming to modify its internal section by interposition of the secondary nozzle 20 between the flow of compressed air and the aforementioned main nozzle 10. [0022] In this example, the pneumatic cylinder 31 is composed of a hollow stem 32 which moves on a piston 33 assembled inside a bore 34; the distal end of the hollow stem 32 being joined to the secondary nozzle 20. In addition, the hollow stem 32 comprises, on the one hand, an inlet opening 35 communicating with the conduit 4 for feeding the compressed air, and on the other hand, an outlet opening, constituting a diffusion nozzle 36 emerging directly in the secondary nozzle 20. The hollow stem is used thus advantageously as a conduit to bring the compressed air into the interior of the pneumatic suction device 1 of the "venturi" type. [0023] According to another characteristic of the invention, the pneumatic suction device 1 comprises control means 40 which are adapted to control implementation the bidirectional movement of the displacement means 30. Specifically, the control means 40 for the level of vacuum in the recovery can, comprises a valve which is able to inject air under pressure, via conduit 5, into the activating part 37 of the bore 34 of the pneumatic cylinder 31, thus translating the piston 33 and consequently, the secondary nozzle 20, to generate a greater vacuum, and this, without the injection of compressed air in the activation part 37 of the bore 34 of the pneumatic cylinder 31, the rest position of the piston 33 being, in fact, the withdrawn position of the pneumatic cylinder. [0024] In accordance with another characteristic of the invention, the control means 40 are, moreover, adapted to determine the level of the vacuum generated inside the pneumatic suction device 1. In practice, the control means 40 communicate with the interior of the pneumatic suction device 1 by the intermediary of a conduit 6. Continue reading about Pneumatic suction device... Full patent description for Pneumatic suction device Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Pneumatic suction device patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Pneumatic suction device or other areas of interest. ### Previous Patent Application: Method and system for monitoring a reciprocating compressor Next Patent Application: Oil well pump apparatus Industry Class: Pumps ### FreshPatents.com Support Thank you for viewing the Pneumatic suction device patent info. IP-related news and info Results in 0.14882 seconds Other interesting Feshpatents.com categories: Novartis , Pfizer , Philips , Polaroid , Procter & Gamble , 174 |
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