ES2306397T3 - POWER PUMP AND INSTALLATION. - Google Patents

Abstract

The pump has a piston defining chambers (82, 89) with a cylinder. The chambers have volumes varying, in phase opposition, progressively with the piston rotation, so that one chamber is alternatively in positions of aspiration and repression of liquid via an inlet and an outlet respectively, and the other is alternatively in positions of aspiration and repression of gas, liquid or mixture of both via an inlet and an outlet respectively. An independent claim is also included for an installation supplying a liquid consuming device e.g. burner, with a fuel oil, susceptible of containing a gas, from a tank containing fuel oil, including a pump.

Description

Pump and power installation.

The present invention relates to a pump of the type comprising a cylinder that has an axis and that defines a blind cavity bounded by a cylindrical inner peripheral face of revolution around the axis and for a first background, presenting the inner peripheral face a first entry and a first exit  of fluid to be pumped, arranged in positions at least almost radially opposite with respect to the axis and that extend each of them on less than 180º with reference to the axis,

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a piston arranged in the cavity and delimited by a peripheral face cylindrical outer revolution around the shaft with a diameter substantially identical to that of the inner peripheral face of the cavity, to establish a sliding and sealed mutual contact to the fluid to be pumped, and by a first front face located opposite First cavity bottom, presenting the peripheral face outside the piston a first depression located adjacent to the first frontal face and that extends over less than 180º with reference to the axis, so that the first depression and the first front face of the piston delimit with the peripheral face inside and with the first bottom of the cavity a first chamber tightly capable of communicating alternately with the first entry and the first exit without being able to communicate to same time with the first entry and with the first exit,

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some means for animating the piston, with respect to the cylinder, with a simultaneous rotation movement around the axis, in one direction constant, and reciprocating along the axis, such that the piston pass successively and cyclically with respect to the cylinder:

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to suction positions by the first chamber, in which the first depression it gives in front of the first entrance and the first front face moves away progressively from the first fund, as the rotation, so as to gradually increase the volume of the first camera, and

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to drive positions by the first chamber, in which the first depression it gives in front of the first exit and the front face approaches progressively to the first fund, as the rotation, so as to gradually reduce the volume of the first camera.

A bomb of this class is known; see the US 5,312,233.

A pump of this type, which allows you to do without of valves and control means of said valves for control the intake and exhaust, it is known in various ways of realization of which an example is marketed by the American company FLUID METERING, INC.

The cylinder of this known pump only It comprises a single inlet and a single outlet and its piston comprises correlatively a single depression.

When this known pump is used for feed a liquid consuming device, such as a burner  of liquid fuel, from a tank containing this liquid, which in turn contains more or less what will be qualified hereinafter "volatile substances", namely substances which, under the effect of aspiration, are susceptible to release in the form of gas bubbles dragged with the pumped liquid, it is a mixture of liquid and gas which is sent to the liquid consuming device

Indeed, it is planned to heel the piston of this known pump, that is, to establish a contact between its first front face and the first bottom of the blind cavity, at the end of the drive, to reduce as much as possible the dead spaces in which it could accumulate and then gas stagnation, to the detriment of the pump flow, taking into The compressible nature of this gas counts, which also mixes intimately the gas with the liquid and can reduce in a certain measure the inconvenience of the presence of gas at the level of liquid consuming device, but this known pump is not susceptible in any way to separate the gas from the liquid to route only liquid to the consumer device. In addition, the worry of heeling the piston in the cylinder forces to respect strict tolerances in the axial position of the piston during its axial reciprocating movement inside the cylinder, which makes the manufacture of said known pump more expensive, at least you choose, for security, avoid a real heel and, consequently, reduce the effect produced on the bubbles present in the liquid.

The objective of the present invention is to propose a pump of the type indicated in the preamble, which allows remedying these inconveniences.

For this purpose, the pump according to the invention is characterized because:

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the cavity is delimited, axially on the side opposite the first fund with respect to the first entry and the first exit, for a second bottom and its inner peripheral face presents, in some respective positions displaced axially with respect to the respective positions of the first entry and the second exit,  in the sense of an extension with respect to the first fund, and forming the same determined angle, with reference to the axis, with with respect to the respective positions of the first exit and the first inlet, a second outlet and a second fluid inlet to pump, extending extend each of them over less than 180º with reference to the axis,

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he piston is delimited, axially on the side opposite the first front face with respect to the first depression, for a second front face located in front of the second bottom of the cavity and its outer peripheral face presents, in a displaced position axially with respect to the position of the first depression, in the sense of a distance from the first front face, and forming said determined angle, increased by 180 °, with regarding the position of the first depression, with reference to axis, a second depression located adjacent to the second face frontal and that extends over less than 180º with reference to axis, so that the second depression and the second front face of the piston delimit with the outer peripheral face and with the second cavity bottom a second susceptible waterproof chamber to communicate alternately with the second entry and with the second exit without being able to communicate at the same time with the second entrance and with the second exit, and isolated in a sealed way of the first chamber, such that, during said movement of the piston with respect to the cylinder:

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the suction positions by the first chamber corresponds to a drive positions by the second chamber, in which the second depression faces the second exit and the second front face approaches progressively to the second fund in order to progressively reduce the volume of the second chamber, and

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drive positions by the first chamber corresponds to suction positions by the second chamber, in which the second depression it faces to the second entrance and the second front face moves away progressively from the second fund in order to increase progressively The volume of the second chamber.

The value of that particular angle can choose freely, but it is preferred to select it from the group comprising:

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he 0º value, in which case the first and second entries are located on the same first side of the shaft and the first and second outputs they are located on the same second side of the axis opposite the first side, which can facilitate the implantation of the pump, while that the first and second depressions occupy positions opposite angles with respect to the axis, and

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he 180º value, in which case the first entry and the second exit they are located on the same first side of the shaft, while the second entry and the first exit are located in the same second side of the shaft, opposite the first, but the first and second depressions are located on the same side of the shaft, which It can facilitate the manufacture of the piston.

If in an installation also characteristic of the present invention, intended to power a device liquid consumer, such as a liquid fuel burner, with said liquid capable of containing a gas, from a Cuba containing said liquid and more or less than has been qualified as "volatile substances" likely to generate said gas, said installation comprising pumping means of said liquid in the tank by means of a degasser of which a lower part is intended to contain a variable amount of liquid and a top part is intended to contain an amount variable of said gas and, if necessary, of said liquid, the means of pumping are constituted by a pump according to the invention whose first entry and first exit are linked respectively to the bottom of the degasser and the consumer device and whose second entry and second exit are linked respectively to the upper part of the degasser and the tank, the combination of the degasser and the pump according to the invention allows route a virtually exempt liquid to the consumer device of gas and cause the return to the gas tank separated from the liquid, eventually accompanied by an amount more or less important liquid.

So, instead of simply proceeding to a intimate mixing of gas and liquid as the pump does known cited above, the pump according to the invention allows proceed to a true degassing of the liquid.

When it comes to fueling liquid a device such as a burner, the use of a pump according to the invention is compatible with most burners modern, whose proper functioning is incompatible with the presence of a more or less controlled amount of gas in the fuel liquid.

Preferably, in said installation, arranges the pump shaft substantially horizontally and it they turn the first and second exits up, which makes the eventually pumped gas out easier, by gravity, of the second exit and allows to permanently secure the presence, at the level of these two outputs, of a quantity of sufficient liquid to maintain a gas tightness between the outer peripheral face of the piston and inner peripheral face of the cylinder, that is, also between the first and second chambers, in an appropriate way to prevent the gas present in the second chamber is mixed with the liquid present in the first camera.

This permanent presence of liquid has also a very particular interest at the level of the second exit when you must pass gas through the second inlet, the second chamber and the second exit, as is the case in said installation, and tends to stagnate in the dead spaces of the pump affecting, due to its eminently compressible character, at its flow through of this second entry and this second exit, through the second camera

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In effect, it allows to act in such a way that, as soon as the second depression comes to stand in front of the second outlet and if the second chamber contains gas, a resuscitation of liquid in this second chamber favor the impulsion of this gas, before the flow of the liquid eventually pumped with the gas, and that, when the second depression leaves the second exit, the second chamber is filled with liquid whose presence contributes to the sealing mentioned above and favors the priming of the pumping by the second inlet, even if there is gas present at the level of this one, by a tendency of this gas to replace in the second chamber  the liquid that is then pushed into the second inlet before of being re-breathed with the liquid from the degasser.

Some may advantageously be provided complementary provisions to facilitate these different effects.

So while the first entry and the first exit can advantageously present a section substantially identical, it can be advantageously provided that the second exit has a section superior to that of the second input, which facilitates gas separation at this level, which then tends to rise and exit naturally from the second outlet, and of the liquid, which tends to remain only present permanently in the second exit, for, on the one hand, contribute to the sealing effect mentioned above, on the other On the other hand, avoid any risk of gas re-breathing through the pump, both when the piston reaches its driving position by the second camera like when you leave this position to recover its suction position by this second chamber, that is, any risk of gas accumulation in the dead spaces of the pump to the detriment of its flow due to the character eminently compressible of this gas.

It can also be provided for this purpose that the pump comprises, within the second outlet, a partition arranged according to an average surface generated by generatrices parallel to the axis and which subdivides the second outlet into two conduits of respective respective section, which can be advantageously identical for the two ducts, or even when the pump shaft is oriented horizontally and the first and second outlets are turned upwards, orient the pump obliquely so that the second outlet is arranged on one side of a vertical plane that includes the axis, this side being chosen in such a way that said direction is ascending there, and joining the second exit to the tank by an internally subdivided pipe, in a part of its length, adjacent to the second exit, in a lower conduit, upstream with reference to said direction, and in an upper conduit, downstream with reference to said direction, which present respective respective sections, by a partition arranged according to a
average surface generated by generatrices parallel to the axis, said sections being advantageously identical.

Some trials have shown that subdivision of the second exit and / or the pipe that joins it to the tank allows to create at the level of the second exit a sweep of liquid that drags the gas away from the second outlet and which thus avoids its re-breathing through the latter.

It can also be foreseen, in the case of such oblique orientation of the pump, the union of the second inlet to the upper part of the degasser through a pipe that forms a convex elbow down, in the vicinity of said second entrance, at a lower level than this one, and presents a section narrowed inside, from a lower area of said elbow to said second entry, which ensures a presence permanent liquid in the second inlet and a priming of the aspiration through it, simply due to the drive towards it, when the second chamber reaches the position of aspiration of a small amount of liquid so re-breathed by the second exit at the moment the second camera has previously abandoned the drive position.

In an installation according to the invention, it is provided also preferably a non-return valve that passes from the second exit to the tank, to avoid a descent of the union from the second exit to the tank when the pump is stopped, and about controlled means of interrupting the connection between the first output and consumer device.

However, it is clear that the use of a pump according to the invention is not limited to said power installation of a liquid consuming device with degassing of it and that would not leave the frame of the present invention using for other purposes a pump according to the invention.

The means to animate the piston with the movement mentioned above with respect to the cylinder can be done in different ways and, in particular, in what refers to the rotation component of this movement, by magnetic coupling with rotating drive means located outside the cavity, then fully closed.

However, one embodiment is preferred according to which the means to animate the piston with said movement with respect to the cylinder they comprise a receiving shaft integral with the piston that forms a coaxial shoulder on the second front face of the piston and that crosses the second bottom, and means of actuation of said receiving shaft located outside the cavity, the recipient tree being delimited, in the sense of a distance with respect to the axis, by an outer peripheral face cylindrical revolution around it, with a diameter lower than the outer peripheral face of the piston, and presenting the second bottom the shape of a ring of revolution around the shaft, which has an inner periphery in sliding contact and sealed with the outer peripheral face of the receiving tree, being constituted, for example, by an annular revolution board around the axis, which has an outer periphery in contact solidarity and tight with the inner peripheral face of the cavity. One skilled in the art will easily understand that said mode of Realization of the second fund is particularly simple.

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The axial reciprocating component of the movement above the piston with respect to the cylinder can also obtained by various means, in particular by transforming the rotation component in an axial reciprocating component such that similar means could be used for this purpose to those comprising the known pump mentioned above, in which the motor means that drive the rotating piston are misaligned  angularly with respect to the piston and actuate it by union mechanical articulated at a displaced point with respect to the axes respective.

However, one embodiment is preferred according to which the drive means of the receiving shaft they comprise motor means that have a coaxial motor shaft to the receiving shaft, fixed axially with respect to the cylinder, and dragged around the axis, in that direction, with with respect to the cylinder, and means of mechanical connection between the motor shaft and receiver shaft, which ensure mutual solidarity  rotating around the shaft and an elastic thrust of the tree receiver, with respect to the cylinder, in an axial direction that goes from the second front face of the piston towards the first front face of the piston, and according to which the first front face of the piston and the first bottom comprise means that form a cam, in support axial mutual, to translate the rotation of the piston around the axis, with respect to the cylinder, in an axial reciprocating motion.

A controlled variation of the speed of rotation of the motor shaft then allows it to vary so predetermined the flow rate of the pump according to the invention, namely in particular, the flow rate of the pumped liquid by means of the first camera and supplied, in the case of an installation according to the invention, to the liquid consuming device.

In addition to the fact that a coaxial assembly of the drive and piston means constitutes a much simpler solution mechanically and much more favorable, in terms of stress transmission and, consequently, in terms of wear and longevity, than the solution It will be noted that the realization of the means of mechanical connection between the drive shaft and the receiving shaft in a way that ensures an elastic thrust of the receiving shaft, with respect to the cylinder, in an axial direction from the second front face of the piston towards the first front face of the latter, allows to guarantee an automatic safety against an abnormal increase of the pressure inside the first chamber, namely, that ensures the pumping of the only liquid in an installation according to the present invention , and, consequently, guarantee a security, for example during the sealing of the connection between the first exit and the consumer device of liquid in the case of an installation in accordance with this
invention.

To realize the means that form a cam in a particularly simple way, it can be expected that the first front face present the shape of an oblique skirt with respect to the axis, in order to axially approach the second front face radially approaching the first depression, and that the first fund present a localized support for said oblique skirt in a area displaced with respect to the axis and located downstream of the first and second exits and upstream of the first and second entries, with reference to that sense, substantially at 90º with regarding the first and second departures and the first and second entries, with reference to the axis.

However, they could be done in a way different means that form a cam and, for example, perform the first bottom in the form of an oblique skirt with respect to the y axis have a misaligned support on the first front face piston, in axial direction, on this oblique skirt. It could then regulate the pump flow rate not only by regulating the rotational speed of the piston with respect to the cylinder, but also by regulating the inclination of the first fund with with respect to the axis, resulting in a modification of the amplitude of the axial reciprocating of the piston.

Other features and advantages of different aspects of the present invention will become more clearly manifest from the following description referring to a non-limiting installation example according to the invention and pump according to the invention, as well as the drawings attached.

Figure 1 schematically illustrates a power installation of a liquid fuel burner a starting from an open-air tank by means of a pump according to the invention associated with a degasser.

Figures 2 and 3 show this pump in the position it preferably occupies in said installation, respectively in section by a vertical axial plane or, preferably oblique, indicated as II-II in the Figure 3, and by an axial plane perpendicular to it, indicated as III-III in Figure 2 and corresponding to a view  from above.

Figure 4 shows a view of the cylinder standing in an axial direction referenced as IV in the figure 5 and that goes from the first fund to the second fund, if refers to the pump as a whole.

Figures 5 and 6 show a view of this cylinder in section by a confused axial plane, respectively, with that of figure 2 and with that of figure 3 and indicated respectively as V-V and VI-VI in Figure 4

Figure 7 shows a view of the pump and of parts, adjacent to it, of pipes connected respectively to the second entrance and to the second exit, in section by a plane perpendicular to the axis, indicated as VII-VII in the Figure 2, while the piston occupies with respect to the cylinder, in the course of its rotation, a position corresponding to the beginning of the communication of the second camera with the second exit.

Figure 8 illustrates, in an extract from figure 2, a relative position of the piston and the corresponding cylinder at the end of the communication of the second camera with the Second exit

An installation is illustrated in Figure 1, according to the invention, for feeding a fuel burner 1 liquid, of the type known as "cup burner swivel "integrated in a boiler not shown, from a cuba 2 open outdoors 3 at the top and that constitutes a reserve of this liquid fuel 4, for example domestic fuel, capable of containing an amount more or less important of what has been described as "substances volatile ", namely, liquid hydrocarbons susceptible to gas phase under the effect of depression generated by pumping, or even air intimately mixed with fuel

For this purpose, a pump 5 is provided according to the invention that will be detailed below and of which see in figure 1 that presents an axis 6 oriented then of substantially horizontal shape, two entries 7 and 8 displaced one with respect to the other parallel to this axis and located below of this, namely, in the example illustrated according to the same plane that includes axis 6 and is oriented vertically or, preferably, obliquely forming with respect to a vertical plane 102, which includes axis 6, an angle α less than 90 ° and, preferably, less than 60 °, namely, for example, of the order of 30º as illustrated in figures 7 and 8, this plane being designated as 9 in figures 3 and 4, as well as in figures 7 and 8. In front of each of entries 7 and 8, according to an address respective radial with reference to axis 6, namely in the example illustrated according to the same median plane 9, above axis 6 and in positions shifted relative to each other parallel to this axis 6, the pump 5 has a respective output 11, 12 by which respectively drives what he aspires for input 7 and what aspires for entry 8, under conditions that will be described to continuation.

Each of entries 7 and 8 is linked by watertight form, through a respective pipeline 13, 14, at a degasser 15 in turn tightly connected to tank 2 by a submersible tube 16 having a lower end provided with an artichoke 17 in the vicinity of a non-referenced fund of this cuba 2, so that the artichoke 17 bathes permanently in the liquid fuel 4 inside the Cuba 2.

The degasser 15 has the shape of a vertical enclosure 18 sealed and delimiting a interior space 19 in which a lower part, which constitutes its for the most part, it permanently encloses a volume 20 of fuel liquid and of which a top part can contain, according to the amount of gas that separates from liquid fuel 4 sucked in Cuba 2 through artichoke 17, under the effect of suction depression, generated by pump 6 in the tube submersible 16 leading to degasser 15 to contain a volume gas variable 21, it being understood that this volume 21 can be canceled if the liquid fuel 4 sucked in the tank 2 is exempt from volatile substances in the sense understood here, in whose case the volume 20 of liquid fuel inside the space 19 fills the entirety of the latter.

The submersible tube 16 flows into the space interior 19 of the enclosure 18 at a level such that, preferably, its mouth 22 towards the interior space 19 is located in the part superior of this one. Channeling 13 flows into this space interior 19 in the form of a submersible tube having an end bottom 23 in the vicinity of a non-referenced bottom of the enclosure 18, at a level lower than that of the mouth 22 of the tube submersible 16 and such that, consequently, this lower end 23 be permanently located inside volume 20; for his part, the pipeline 14 flows into the interior space 19 of the enclosure 18 at one end 24 located at the top of this internal volume 19 to be placed as far as possible in the inside of gas volume 21 separated from the liquid inside of degasser 15, it being understood that the volume 20 of liquid it can sometimes reach the level of this end 24.

In the interior space 19 of the enclosure 18 is arranged a filter wall 25 separating from the mouth 22 of the submersible tube 16 the lower end 23 of the submersible tube pipeline terminal 13 and pipeline end 24 14 in order to prevent penetration, in pipes 13 and 14, of any solid impurities contained in the fuel liquid 4 pumped into tank 2.

The interior space 19 of the enclosure 18 is set in depression due to the suction of the pump 5 at the level of its inputs 7 and 8, which causes a fuel pumping effect liquid 4, by submersible tube 16, inside the tank 2, and a suction of degassed liquid fuel in the volume 20 occupying the lower part of the enclosure 18 by the pipe 13 and the inlet 7 of the pump 5, while, according to the respective proportions of volumes 20 and 21, that is, according to the proportion of gas released by liquid fuel 4, pumped in the tank 2 and that reaches the interior space 19, the entrance 8 and the pipeline 14 can aspirate either gas alone or liquid fuel, or a mixture of both.

Output 11 associated with input 7 as well fed exclusively with liquid fuel, that is, the exit 11 located in a position substantially diametrically opposite to that of input 7 with reference to the axis 6, above it, is connected to the burner 1 by a pipe 26 provided with means 27 that allow, in a controlled manner, to close this channel 26 or open it. Media 27 may be constituted, for example, by an electric gate as illustrated in figure 1.

Output 12 associated with input 8, that is, located in a substantially diametrically opposite position with respect to this input 8 with reference to axis 6, fed sometimes of liquid fuel, sometimes of gas and sometimes of a mixture of the two, in turn flows into a lower end of a section, ascending from this exit 12, of a return channel 28 towards the tank 2, inside the which this channel 28 ends at an end 29 located generally above the upper level of liquid fuel 4, inside the tank 2, that is, outdoors 3, in order to allow the return to the tank 4 of the liquid fuel eventually pumped in volume 21 and air evacuation 3 free of gas eventually pumped in volume 21.

At a distance from the outlet 12 of the pump 5 enough to allow permanent maintenance, immediately  above this exit 12, in the ascending section of the pipeline 28, of a certain volume 30 of liquid fuel topped by a certain volume 31 of gas, the pipe 28 comprises a valve non-return 32 that passes from exit 12 towards end 29 of the channel 28 and that locks in the opposite direction, valve non-return 32 which is preferably also disposed of such so that a certain volume 33 of liquid fuel is maintained permanently above it, to increase its tightness in against a step in a direction that goes from the end 29 towards the exit 12, under the combined effects of the gravity that is exerted about this volume 33 and of a depression generated cyclically in the section of the pipeline 28 located between the outlet 12 and the valve non-return 32 for a resuscitation of a part of volume 30 of liquid fuel through exit 12, which immediately precedes each gas drive through this outlet 12, according to a phenomenon that manifests in a pump according to the present invention, when the fluid to be pumped is compressible, that is, it contains a proportion more or less important volatile substances, suitable to move to gas phase under the effect of aspiration depression due to pump, and that will be described in more detail below.

Channels 13 and 26 present preferably the same section of passage, and the same thing can happen with pipeline 14 or pipeline 28, which, however, preferably has a section of passage greater than that of the channeling 14 for reasons and under conditions that will be detached from The continuation of the description.

The gravity exerted on volume 30, the aforementioned cyclic resuscitation of a part of this volume 30 and the permanent presence of fuel only in the pipe 26, in which this liquid fuel is subjected also to the action of gravity and a similar effect of cyclic re-breathing before each drive through its exit 11, allow to keep the inside of the pump 5 permanently in a liquid fuel bath, thus contributing to obtaining the useful seals for pumping, as will be understood from reading the continuation of the description, relative to pump 5 according to the invention itself, referring to the Figures 2 to 8, in whole or in part of which find axis 6, inputs 7 and 8, the middle axial plane 9 and Exits 11, 12.

It has also been represented in whole or in part of these figures 2 to 8 a plane 34 that includes axis 6 and oriented perpendicularly to plane 9, plane 34 which is oriented, therefore, substantially at 30 ° with respect to a horizontal plane 103 that includes axis 6 in the position of use of the pump 5 illustrated by way of example in the Figures 1, 7 and 8; this position of use will serve as a reference  for the continuation of the description of the pump 5 and its components.

In particular, these components comprise, of known form, a cylinder 35 and a piston 36 presenting in common axis 6, the cylinder 35 being fixedly fixed on a fixed support 37 with respect to the consumer device of liquid, namely, in the illustrated example, burner 1, to the tank 4 and the degasser 15, and the piston 36 being animated by means comprising, in particular, a motor 38, for example electric, supported by bracket 37, with a movement that combines, simultaneously, a rotation movement around of axis 6, in a certain direction 39, with respect to cylinder 35 and a reciprocating motion 40, along axis 6, with respect to the cylinder 35. When plane 9 is oriented obliquely with with respect to the vertical plane 102 as illustrated in the figures 7 and 8, the obliqueness is such that sense 39 is ascending by the side of vertical 102 on which exit 12 is located.

The cylinder 35, illustrated in isolation in the Figures 4 to 6, presents a symmetrical general conformation with with respect to planes 9 and 34. Define inside a blind cavity 41 delimited by a cylindrical inner peripheral face 42 of revolution around axis 6 and by a bottom 43 that cuts axis 6 and, in the illustrated example, it is flat and perpendicular to this axis 6. On the opposite side of the bottom 43 along the axis 6, the cavity 41 it has an opening 44 at the level of which the face 42 joins, by a circular edge 45 of axis 6, to an inner peripheral face 47 conical trunk of revolution around axis 6 and which widens to from edge 45 in the sense of a distance from to the inner peripheral face 42 and to the bottom 43.

The inner peripheral face 42 and the bottom 43 they are defined respectively by a tubular wall 48 and by a background wall 49, in solidarity with each other and made advantageously in one piece, while the peripheral face interior 47 is constituted, at least essentially, by a 50, annular revolution flange around axis 6, which forms protrude outward from the tubular wall 48, in the direction of a distance with respect to axis 6, in an axially axial end zone opposite the bottom wall 49, this flange 50 serving the fixing the cylinder 35 to the support 37 by means of a ring 51 annul revolution between axis 6, as illustrated in the Figures 2 and 3. However, it is clear that it could be chosen another way of mounting the cylinder 35 on a support 37 without departing from the scope of the present invention.

According to the same axis 52 perpendicular to axis 6 and located on plane 9, closer to the bottom 43 than to the edge 45, input 7 and output 11 flow into the peripheral face interior 42 through a respective hole 43, 54 which, when observed along axis 52, preferably has the form of a oblong port according to a circumferential direction with reference to axis 6 and symmetric with respect to plane 9. In the example no limiting illustrated, this shape is defined by an arc of circle centered on axis 52, which extends over approximately 240º with reference to axis 52, on the side opposite to bottom 43, symmetrically with respect to plane 9, and by a rope of the same circle towards the bottom 43; the diameter of the arc of circle, identical for both holes 53 and 54, is less than that of the inner peripheral face 42, namely more precisely, small enough with respect to face diameter inner peripheral 42 so that each of the holes 53, 54 is extend over less than 180º with reference to axis 6. Thus, in the Illustrated example, the diameter of each of the circle arcs corresponding respectively to holes 53, 54 is approximately equal to half the diameter of the peripheral face interior 42, but this relationship is only indicated by title non-limiting example.

The two holes 53 and 54 thus offer the same step section, which constitutes the useful section of entry 7 and of exit 11, as well as pipes 13 and 26 have preferably in all of their respective length about Useful sections identical to each other.

According to another axis 55 also perpendicular to axis 6 and located in plane 9, but closer to the circular edge 45 that at bottom 43 with reference to axis 6, input 8 and output 12 flow into the inner peripheral face 42 through a hole respective 56, 57 which, when observed along axis 55, presents also preferably the shape of an oblong port according to a circumferential direction to axis 6 and symmetric with respect to plane 9. In the non-limiting example illustrated, this form is identical to that of holes 53 and 54, that is, it combines an arc of symmetrical circle with respect to plane 9, centered on the axis 55 and having, with reference to this axis 55, a diameter and a angular development identical to those of holes 53 and 54, and a rope of the same circle, in order to offer the same step section and to extend angularly, with reference to axis 6, on less 180º, respectively. However, the circle arcs that partially delimit the shape of holes 56 and 58 are turned in the opposite direction to those that partially delimit the holes 53 and 54.

The two holes 56 and 57 thus present a same step section that, in this example, is identical to that of the holes 53 and 54, but it could also be different, such as an expert in the field will easily understand. This section of step could constitute the useful section of entry 8 and the output 12, respectively, and pipes 14 and 28 could present the same useful section, slightly higher than that of the input 8 and output 12, respectively, on all of their respective length, but a sizing is preferred different relative that will follow from the following description.

However, in the sense of a distance with with respect to axis 6 according to the respective axis 52, 55, each of the holes 53, 54, 56, 57 flows into a respective cavity 63, 65, 64, 58, respectively coaxial, which presents perpendicularly to the respective axis a section that, slightly higher than the corresponding hole, is identical for all cavities 63, 65, 64, 58 in the illustrated example. Each of these cavities 63, 65, 64, 58, which materialize respectively input 7, output 11, the entrance 8 and the exit 12, is constituted by a terminal respective tubular 66, 68, 67, 62 coaxial socket, integral, respectively of the pipeline 13, of the pipeline 26, of the channeling 14 and channeling 28, each of which is carried out these one-piece terminals with the tubular wall 48.

More precisely, each of the cavities 63, 65, 64, 58 is delimited, in the sense of a distance with with respect to the respective axis, by an inner peripheral face of the terminal 66, 68, 67, 62 respectively corresponding, which is cylindrical revolution around the respective axis with a diameter substantially identical to the circle arc part of the contour of the hole 53, 54, 56, 57 respectively correspondent.

However, in a schematic variant in mixed strokes in figure 5, it can also be expected that the exit hole 57, in the direction of a distance with respect to axis 6, in a cavity 58 presenting perpendicular to axis 55 a section far superior to the of this hole 57, to communicate to the exit 12 properly said a section also superior to that of the entrance 8 constituted through cavity 64.

More precisely, in this variant, as illustrated, cavity 58 is delimited by a peripheral face cylindrical interior 59 of revolution around an axis 60 located in plane 9, parallel to axis 55, but offset with respect to this, parallel to axis 6, towards circular edge 45 and the flange 50, and the diameter of this inner peripheral face 59 is larger that of the circle arc part of the hole 57. The displacement between axes 55 and 60, measured according to axis 6, is substantially equal to the difference between the respective radii of the hole 57 and the inner peripheral face 59, in such a way that the latter extends the hole 57 in the direction of a distance with respect to axis 6, in the respective areas of this hole 57 and of this inner peripheral face 59 closest to the bottom 43, and that the cavity 58 releases thus, on the side of the hole 57 corresponding to flange 50, a displaced space 61 parallel to axis 6 with respect to hole 57 and which facilitates thus the release of the gas that can leave through hole 57 in form of a mixture with liquid fuel, that is, a rise of this gas to constitute volume 31, while the liquid fuel tends to constitute volume 30 so permanent.

The pipeline 28 associated with the output 12 it presents in this case over its entire length a useful section identical to the passage section that cavity 58 offers perpendicular to axis 60, which is greater than that of the input 8 and the associated pipeline 14, as well as, in the illustrated example, to the respective sections mutually identical to input 7, output 11 and pipes 13 and 26 that are respectively associated with them, as has been schematized in figure 1.

However, it is preferred, to facilitate the separation of gas and liquid fuel at outlet 12, resort to provisions that allow to dispense with the cavity 58 a section greater than that of cavity 64, that is, that allow terminals 66, 67, 68 to be shaped identically, 62, and which will now be described with reference to Figures 7 and 8, in which terminals 67 have been effectively illustrated and 62 identical to define cavities 64 and 58 thereof section at inlet 8 and outlet 12 of the pump.

In this case, in its ascending section between the outlet 12 and non-return valve 32, pipeline 28 presents in its connection with terminal 62 and on a first part of its length, of the order of a few centimeters, from this one, a first section of passage substantially equal to that of the cavity corresponding 58. Generally flexible, channeling 28 coaxially extends terminal 62 at least in the portion of this first part closest to this one and can be diverted to continuation on the rest of this first part, for example, until oriented substantially vertically as illustrated in figure 7. In a second part of its length, which goes from the first part to the check valve 32, and in the rest of its length, which goes from check valve 32 to the Cuba 2, the channel 28 presents a second section of passage substantially higher than the first section of passage and, by example, of the order of three times this one.

In the first part of its length, namely preferably in the entirety of this first part, as well as, on the one hand, inside the cavity 58 and the hole 57, up to the proximity of a geometric extension of the face inner peripheral 42 of cylinder 35 in front of this hole 57, and, on the other hand, inside the second part of his length, however, limited to immediate proximity of the connection of this second part to the first part, the channeling 28 is divided internally into two ducts parallels 104 and 105 by a smooth partition 106 arranged according to a average surface generated by generatrices parallel to axis 6 and so that it confers to each of the conduits 104 and 105 a respective section constant in the first part of the length of the pipeline 28. According to the preferred embodiment illustrated, these generatrices are confused with diameters of the passage section of the pipeline 28 and cut the shaft 55 at an angle straight inside the cavity 58, where they are located in plane 9, although both ducts 104 and 105 have the same passage section substantially equal to half of the section of passage of cavity 58 and duct 28, if it refers to the First part of its length. It will be noted that, taking into counts the obliqueness of the pipeline 28 in its connection with the terminal 62, the conduit 104 located upstream with reference to the sense 39 is below the partition 106, while the duct 105 located downstream with reference to direction 39 se places above partition 106; these two ducts communicate inside the hole 57 by an end edge of the partition 106, which is rectilinear and parallel to axis 6, and connect between them in the second part of the length of the pipe 28.

In addition, while channeling 14 presents preferably a constant passage section, substantially equal to that of the first part of the length of the pipe 28, over the entire length between its end 24 and an elbow 107, convex down, which forms in the immediate proximity of its junction with terminal 67, to which this elbow 107 joins by a section 108 approximately straight, of axis 55, it is preferred to reduce the passage section offered by this section 108, preferably of the lower part of elbow 107 in the immediate vicinity of the hole 56, inside the cavity 64, at a lower value than the passage section offered by hole 56 and, for example, of order of a ninth of this, indicating this value by way of non-limiting example For this purpose, in the illustrated example, a tubular sleeve 109 of appropriate section and length is inserted in solidarity inside section 108 and the cavity 64, but other means could naturally be used without thereby departing from the framework of the present invention.

Taking into account the papers that are respectively secured by partition 106 at exit 12 of the pump 5 and sleeve 109, or any other narrowing similar to the input 8 of the pump 5, compared to the output 12 of this, and which will be described below, partition 106 and sleeve 109, or any other similar narrowing, should considered as preferred provisions not only of a installation comprising a pump 5 according to the invention, but also of this pump 5 in which these provisions could be integrated after manufacturing it, regardless of its incorporation into said installation.

Naturally, others can be chosen conceptions, particularly depending on the nature of the pipes 13, 14, 26, 28, to materialize inputs 7, 8 and the outlets 11, 12 of the cylinder 35, without thereby departing from the framework of the present invention. In particular, although it has been described an embodiment in which, at the same time, a partition 106 subdivide channel 28 into two channels 104 and 105 at exit 12 of the pump and the pipeline 14 presents a narrowing located at the entrance 8 of it, would not leave the framework of the present invention use these arrangements independently One of another.

Likewise, one skilled in the art will easily understand that the holes 53, 54, 56, 57 may also be formed differently from the one described and illustrated, however, preserving, however, preferably, the respective shape of an oblong port in a circumferential direction, with reference to axis 6, which allows reducing the dimension of each of the depressions 79 and 89 parallel to axis 6 for an identical respective passage section, that is, also reducing dead spaces that can accumulate gas, whose stagnation inside the cylinder 35 would be unfavorable for the pump flow, taking into account the compressibility inherent in the
gases

For reasons that will be revealed in the following description, the bottom wall 49, essentially flat, presents a bulge 69 outward locally for define at the bottom 43 of the cavity 41 a hollow housing 70 blind to a ball 71 having a diameter smaller than that of the bottom 43, namely, on the order of half the diameter of bottom 43 in the non-limiting example illustrated.

This housing 70 and this ball 71 have a axis 72 displaced with respect to axis 6, but parallel to it in the plane 34, such that the direction 39 of coaxial rotation of the piston 36 with respect to cylinder 35 be descending, from the exits 11 and 12 towards inputs 7 and 8, on the same side of the plane 9 than axis 72.

The diameter of the ball 71 and the depth of the housing 70, measured along axis 72, that is, parallel to the axis 6, between a flat bottom not referenced therein, perpendicular to axis 72, and bottom 43 are chosen such that ball 71 forms a protrusion into the blind cavity 41 parallel to the axis 6 with respect to the bottom 43, as shown in figure 3. More precisely, the depth of the housing 70 has a value intermediate between the radius of the ball 71 and the diameter of this, namely, of the order of three quarters of this diameter in the illustrated non-limiting example, and housing 70 presents perpendicular to axis 72 a constant circular section of a diameter substantially identical to that of ball 71 in order to immobilize the ball 71 with respect to the cylinder 35.

However, according to the direction of axis 6, the ball 71 is fully arranged withdrawn towards the bottom 43 of the cavity 41, with respect to the alignment, perpendicular to the axis 6, of the areas of holes 53 and 54 closest to this background 43.

Ball 71 thus creates, according to axis 72, a projection located with respect to the bottom 43 of the blind cavity 41, parallel to the axis 6 thereof, to offer the piston 36, in the bottom direction 43 parallel to axis 6, a punctual support displaced with respect to this axis 6.

The piston 36, which will now be described with reference to figures 2 and 3, it is arranged in cavity 41 in a tightness relation with respect to the peripheral face interior 42 of this and, for this purpose, is delimited, in the sense of a distance from axis 6, on one side outer peripheral 74 cylindrical revolution around this axis 6 with a diameter substantially identical to that of the face inner peripheral 42, so that it is also established between faces 74 and 42 a guiding relationship in relative rotation around axis 6, as well as in relative translation parallel to this axis 6.

In a sense that goes parallel to axis 6, from the circular edge 45 of the inner peripheral face 42 of the cavity 41 towards the bottom 43 thereof, the outer peripheral face 74 of the piston 36 is connected to a front face 75 thereof, which is flat, secant of axis 6, but presents with respect to this one orientation different from 90º, so that when it is rotated the piston 36 around the shaft 6 inside the cavity 41, in the direction 39, with respect to the cylinder 35, maintaining a support point of the face 75 on the ball 71, in the direction of the bottom 43 of the cavity 41, in the vicinity of the axis 72, the rotation of the piston 36 with respect to cylinder 35 is accompanied by translation relative 40 reciprocating parallel to axis 6.

A motor can then be chosen as engine 38, for example electric, which has an output shaft or tree engine 85 coaxially arranged to piston 36, motionless in translation along axis 6 with respect to support 37 and cylinder 35, but driven in rotation in direction 39, around axis 6, with with respect to the support 37 and the cylinder 35, when the motor 38 is powered, this 85 drive shaft attached to the piston 36 by means of transmission that ensure solidarity mutual rotation around axis 6, while being compatible with a relative reciprocating translation parallel to axis 6 and, preferably, being able to apply in turn elastically the piston 36 towards the bottom 43 of the blind cavity 41, as is the case in the illustrated example.

In this example, in which the motor 38 is located on the side of the support 37, that is, in opposition to the front face 75 with reference to axis 6, piston 36 supports jointly and severally for this purpose, for example by carrying out a single piece, a coaxial axle 84, motion receiver, arranged in front of the front face 75 with reference to axis 6 and delimited in the sense of a distance with respect to axis 6, in a axial dimension at least equal to the translation stroke of the piston 36 inside the cylinder 35, parallel to the axis 6, during the relative reciprocating movement 40, by a peripheral face cylindrical outer 101 of revolution around axis 6 with a smaller diameter than the outer peripheral face 74 of the piston 36, that is, also that of the inner peripheral face 42 of the cylinder 35. The outer peripheral face 101 of the receiving shaft 84 is attached to the outer peripheral face 74 of the piston 36 by a front face 88 thereof, which is annular, flat, perpendicular to the shaft 6 and delimits piston 36 on the side opposite its front face 75 with reference to axis 6. The respective dimensions of the piston 36 and cylinder 35 parallel to axis 6 are chosen such that, during the reciprocating movement previously 40, the outer peripheral face 101 stay permanently inside of the cavity 41, that is, it is located axially between the edge circular 45 and bottom 43 of cavity 41.

The rotation of the drive shaft 85 in the direction 39 it is then communicated to the receiving shaft 84 by means of a spring helical 93 of axis 6, axially interposed between the drive shaft 85 and the receiving tree 84 and presenting an extreme section 94, 95 in solidarity union respectively with the driving shaft 85 and with the shaft receiver 84, for example by tight fitting on a stud respective coaxial 96, 97, as an expert will easily understand in the matter.

The studs 96 and 97 are axially spaced from each other, in any position of the piston 36 in its movement reciprocating reciprocating 40, due to proper sizing, easily determined by a person skilled in the art, thereby that between the two extreme sections 94 and 95, the spring 93 has some free turns 98 in sufficient numbers to be able to evolve between an axial expansion limit position, illustrated in the Figure 3, in which the front face 75 rests on the ball 71 in its zone 77 closest to the front face 88, that is, the most away from bottom 43, parallel to axis 6, and a limit position of maximum axial compression, not illustrated, in which it is in the immediate proximity of its zone 76 the furthest from the front face  88, that is, the one closest to the bottom 43, with reference to axis 6, in which the front face 75 rests on the ball 71.

Also, easily determined by one skilled in the art, the winding direction of spring 93 is such that the rotation of the drive shaft 85 in the direction 39 and the resistance that piston 36 tends to oppose a rotation in the same sense, with respect to cylinder 35, they translate into a increase of a radial tightening effect applied by the sections ends 94, 95 of spring 93 on the pins 96 and 97, respectively.

The nature of the engine 38 and the mechanical joint between the drive shaft 85 and the receiving shaft 84 in order to secure the same time the drag of the piston 36 in rotation around the axis 6 in direction 39 with respect to cylinder 35 and maintenance of the front face 75 in permanent support against the ball 71 could choose, however, differently in a wide range of possibilities, without departing from the framework of the present invention.

The inclination of the front face 75 with with respect to axis 6, the projection forming the ball 71 parallel to this axis 6 on the bottom 43 of the blind cavity 41 and the displacement of axis 72 with respect to axis 6 are calculated from such that, whatever the orientation of the piston 36 around axis 6 with respect to cylinder 35, front face 75 never contact bottom 43 of cavity 41. It you will notice that the punctual support of the front face 75 on the ball 71 is always located in the immediate proximity of axis 72 and that ball 71 may be replaced by any other means that allows offer similar localized support, offset from the axis 6, in particular along axis 72.

Thus, according to a variant not illustrated, but easily understood by a person skilled in the art, ball 71 can be replaced by a conical protrusion of revolution around the axis 72 and defined by some generatrices that present, with respect to this axis 72, an inclination identical to the inclination of the face front 75 with respect to axis 6, to permanently offer this front face 75 a support along one of these generatrices

In your area 76, as in most of your contour, that is, at more than 180º with reference to axis 6, the face 75 joins directly to the outer peripheral face 74, but, in its zone 77, she joins by an edge 78, rectilinear in this case and located in a non-referenced plane perpendicular to axis 6, plus away from axis 6 than axis 72, to a depression 79 arranged in hollow, localized, on the outer peripheral face 74 and adjacent to the front face 75. In the illustrated example, this depression 79 is bounded by a plateau 80, which is parallel to the axis 6 and to which the front face 75 joins by the edge 78 in its zone 77, and by a flat step 81 perpendicular to axis 6, which ensures the attachment of plateau 80 to the outer peripheral face 74 on the side opposite edge 78 with reference to axis 6. So In addition, the plateau 80 joins the outer peripheral face 74 by two rectilinear edges parallel to axis 6 and not visible in the figures, as an expert in the field will easily understand.

The plateau 80 extends angularly between its two edges not shown, with reference to axis 6, in one angular dimension less than 180º and chosen, like the distance that separates edge 78 and step 81 from each other, parallel to axis 6, depending on the orientation of the face front 75, of the projection forming the ball 71 parallel to the axis 6 with respect to the bottom 43 and the displacement of the axis 72 with with respect to axis 6, such that, as the rotation of the piston 36 with respect to the cylinder 35, around the axis 6, in the direction 39, with maintenance of the front face 75 in permanent support against ball 71, piston 36 passes successively and cyclically with respect to cylinder 35:

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about suction positions of liquid fuel through input 7 in a sealed chamber 82 defined inside the cavity 41 by the bottom 43 thereof, defining the front face 75 of the piston 36, the plateau 80 and stepped 81 depression 79 of this one, and an area corresponding of the inner peripheral face 42 of the cavity 41, Y

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about supply positions, towards the outlet 11, of the liquid fuel thus aspirated by this chamber 82.

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In aspiration positions, depression 79 faces hole 53 of entrance 7, while the face outer peripheral 74 faces hole 54 of exit 11 to seal it tightly, and the front face 75 moves away progressively from the bottom 43 of the cavity 41, as it produces rotation in the direction 39, in order to increase progressively the volume of the chamber 82 and thus create in it the Wanted effect of aspiration of liquid fuel arriving by entry 7.

On the contrary, in the positions of drive, depression 80 faces hole 54 of the exit 11, while the outer peripheral face 74 of the piston 36 seals airtight hole 53 of the entrance 7 and the front face 75 of piston 36 progressively approaches bottom 43 of the cavity 41, as rotation occurs in the direction 39, to in order to progressively reduce chamber volume 82 e thereby driving the liquid fuel towards the outlet 11.

For this purpose, the sizing of different parts of cylinder 35 and piston 36 and the sizing of the ball 71 or any other located projection to replace it, can easily be determined by the expert in The matter.

Also, this subject matter expert can easily conceive that instead of being bounded by a plateau 80 flat and by a stepped 81 also flat, depression 79 could present another conformation, preferring, however, the conformation indicated by way of non-limiting example by reason of a great simplicity of manufacturing that this entails.

It will be noted that, in addition to its media function of mechanical connection between the drive shaft 85, axially fixed but rotary, and piston 36, in permanent elastic support on its face front 75 against ball 71, spring 93 plays a role safety against an abnormal increase in pressure in the inside the sealed chamber 82, since said increase in pressure can result in an increase in chamber volume 82 by axial compression of spring 93 between its two sections ends 94 and 95.

With proper part sizing of piston 36 and cylinder 35, respectively, the closest to the front face 75 and to the bottom 43, one could do that, from a certain threshold, during said pressure increase, the face front 75 is sufficiently far from the bottom 43 so that it establish a direct connection, through cavity 41, between the output 11 and input 7, that is, so that the effect disappears pumping through chamber 82.

The pumping effect of liquid fuel sucked in by input 7 and driven by output 11 that just being described does not, however, constitute the sole function of the pump 5 according to the invention, which is otherwise designed to also aspirate the gas, liquid fuel or gas mixture and of liquid fuel that arrives at the entrance 8, to boost it through exit 12.

For this purpose, the piston 36 is arranged to delimit tightly, inside the cavity 41 of the cylinder 35, another chamber 83 located in front of chamber 82 with reference to axis 6, under conditions such that the volume of this chamber 83 varies in phase opposition with the variation of volume of the chamber 82, during the rotation of the piston 36 around axis 6 with respect to cylinder 35, in the direction 39, with support of the front face 75 against the ball 71, and in such a way that chamber 83 communicates with input 8 being insulated leakproof of exit 12 and present an increasing volume progressively to create an aspiration effect through input 8 when the waterproof chamber 82 is located in front of the exit 11, and, on the contrary, be put in communication with the outlet 12 being insulated in a sealed manner with respect to the input 8, and gradually decrease in volume when the camera waterproof 82 is put in communication with input 7.

For this purpose, between the inner peripheral face 42 of cavity 41 and outer peripheral face 101 of the tree receiver 84 is interposed a sealing gasket 86, annular of revolution around axis 6, which has an inner periphery 99, in sliding and sealed contact with the outer peripheral face 101 of the receiving shaft 84, and an outer periphery 100, fixed in solidarity and tightly to the inner peripheral face 42 of the cavity 41, in an axial position such that this joint 86 does not constitutes no obstacle to the reciprocating movement 40 of the piston 36 with respect to cylinder 35 and remain permanently in tight contact with the receiving shaft 84 during this movement reciprocating 40.

This joint 86, which is turned on its side axially towards the bottom 43 of the cavity 41 another bottom 87 of this, and a part of the inner peripheral face 42 of the cavity 41 immediately adjacent to this bottom 87, axially therein side that the bottom 43, delimits the chamber 83 as regards the cylinder 35.

As far as piston 36 is concerned, this chamber 83 is partially delimited by the front face 88 rotated in the opposite direction to the front face 75 and located opposite the bottom 87, and for a depression 89 practiced in the peripheral face outer 74 of piston 36 in immediate proximity to this face front 88 and in an angular position, with reference to axis 6, 180º angularly displaced with respect to depression 79, in relationship with which, otherwise, this depression is displaced axially

More precisely, the front face 88 of the piston 36 joins in more than 180º, with reference to axis 6, to the face outer peripheral 74 of piston 36 in the direction of a distance with respect to axis 6, but in the rest of its outline, in this sense, it is delimited by a rectilinear edge 90 substantially parallel to edge 78 and located at a distance of the intermediate axis 6 between the respective radii of the faces outer peripherals 101 and 74. On this edge 90, said face frontal connects to a plateau 91 substantially parallel to its time to the 80 plateau and hollowed in the peripheral face exterior 74, withdrawn towards axis 6 with respect to it, in a side of axis 6 opposite that of plateau 80. This plateau 91 defines the depression 89 with a stepped 92 plane perpendicular to axis 6 and turned in the opposite direction to step 81. This step 92 joins the plateau 91 to the outer peripheral face 74 of the piston 36, axially in front of the edge 90, and the plateau 91 joins, so other, to the outer peripheral face 74 by two edges not represented, rectilinear and parallel to axis 6, with respect to which are angularly separated from each other by less than 180º. More precisely, these two edges are angularly displaced one with respect to another, with reference to axis 6, identically to the edges, also parallel to axis 6, which delimit the plateau 80 in the circumferential direction with reference to this axis 6.

It is clear that, like depression 79, the depression 89 could present a different way than just described, understanding that currently preferred by reasons of ease of manufacture.

Depression 89 is positioned and sized, axially and angularly with reference to axis 6, such that the chamber 83 is permanently insulated from chamber 82 due to the tight and sliding contact of the peripheral face outer 74 of piston 36 against inner peripheral face 42 of cylinder 35, and that, when the piston 36 rotates in the direction 39 in the inside of cylinder 35 with permanent front face support 75 against the ball 71:

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the aforementioned positions of liquid fuel drive by the waterproof chamber 82 correspond to suction positions of gas, liquid fuel or a mixture of the two by the chamber 83, in which depression 89 faces hole 56 of the entrance 8 and the front face 88 progressively moves away from the bottom 87 constituted by the board 86 in order to progressively increase the chamber volume 83, while the outer peripheral face 74 of the piston 36 sealed the hole 57 leading to exit 12, and

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the above mentioned positions of suction of liquid fuel by the waterproof chamber 82 correspond to drive positions of the air, liquid fuel or the mixture of the two by the chamber 83, in which depression 89 faces hole 57 leading to exit 12 and front face 88 approaches progressively to fund 87, in order to progressively reduce the chamber volume 83, while hole 56 of the inlet 8 is sealed tightly by the outer peripheral face 74 of the piston 36, without the chamber 83 can ever be placed in communication simultaneously with the two holes 56 and 57, at same as camera 82 cannot communicate simultaneously with the two holes 53 and 54.

A subject matter expert will easily determine the respective sizing of the different parts of the cylinder 35 and piston 36 for this purpose.

A person skilled in the art will also understand easily that said operation of the pump according to the invention, in which cameras 82 and 83 work in phase opposition, could obtained even if input 8 and output 12 were angularly displaced identically, namely at an angle of the same value and in the same sense, with respect to entry 7 and at exit 11, respectively, with reference to axis 6, set that depression 89 would be displaced in the same direction, in a angular distance presenting the value of said increased angle at 180º, with respect to depression 79, with reference to the axis 6.

Taking into account the orientation of use cited above from pump 5, the gas eventually pumped by the input 8 tends to leave the exit immediately by gravity 12 up while the liquid fuel eventually pumped by the same input 8 tends to remain by gravity in inside the cavity 58 to thus participate in the tightness of the mutual contact between the outer peripheral face 74 of the piston 36 and the inner peripheral face 42 of the cylinder 35, as well as occurs with the liquid fuel that passes through the entrance 7, the waterproof chamber 82 and exit 11.

In addition, the gas possibly present in the chamber 83 when it enters into communication with the hole 57 leading to this outlet 12, then leaves this chamber 83, in which it is replaced by a part of the liquid thus present at the level of this outlet 12 , and it is also liquid that fills the chamber 83 at the moment when the communication with the hole 57 is interrupted, which avoids any gas resuscitation, whose compressible character, if it were carried away
brought by the piston 36 into the dead spaces of the pump 5, it would seriously disturb its operation.

In this regard, the arrangement of a cavity 58 having a section of passage greater than that of hole 56, 57, as illustrated in Figure 5, facilitates a separation by gas expansion

However, the pipeline subdivision 28 in two ducts 104 and 105, respectively upstream lower and upper downstream with reference to direction 39, by a partition 106, as described with reference to Figure 7, has most effective test result:

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favoring a rise in gas through the upper downstream duct 105 and a fuel resuscitation liquid only through the lower upstream duct 104 when chamber 83 starts communicating with channel 28 during rotation of the piston 36 in the direction 39 with respect to the cylinder 35, as outlined in figure 7, and

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allowing then as the flow of gas, liquid fuel or a mixture of the two, outside chamber 83, towards exit 12, which this drive is accompanied by a liquid fuel sweep coming from the duct 104, contouring the edge of the partition 106 closest to piston 36 and tracing along conduit 105, and that thus contribute to the rise of gas, that is, to the removal of this one with respect to the pump 5, as outlined in the figure 8.

It ensures that, under normal regime of operation of the pump 5, the piston 36 bathes to the extent of possible in liquid fuel inside cylinder 35 and gas trapped there in quantity as small as may be possible.

In particular, it is ensured that chamber 83 is fills with liquid fuel when its communication with the cessation ceases exit 12 and liquid fuel is driven towards input 8 when, then, camera 83 is put back on communication with it, before the aspiration begins.

The presence of sleeve 109 or any another similar means of strangulation of the pipeline 14, between elbow 107 and entry 8, and terminal 67 allows in turn reduce the volume available between elbow 107 and hole 56 for this drive a certain amount of liquid fuel when camera 83 communicates with input 8, so which also ensures the presence of liquid fuel in this input 8 and creating a suction effect towards the camera 83, for input 8, as soon as this initial drive has ceased, even if only gas arrives or a mixture of gas and fuel liquid to elbow 107 through the pipeline 14 from the degasser fifteen; it also ensures that the volume of liquid fuel initially driven will be completely re-breathed then with liquid fuel, gas or a mixture of the two that reaches the elbow 107 from the degasser 15.

Naturally, as in most pumps of liquid fuel, a certain amount of this is introduced fuel at each of outputs 11 and 12 during the first commissioning of the pump 5 according to the invention for benefit, from this first commissioning, of the different favorable effects of the presence of fuel liquid not only at the level of these outputs, but also in the inside the cylinder 35, around the entire piston 36, and in entries 7 and 8.

A person skilled in the art will easily understand that, although it is particularly appropriate for feeding a liquid fuel burner capable of containing gas, a pump according to the invention could be used in any other application in which it is necessary or preferable to practice a effective degassing of a liquid before sending it to a user device, so that the installation described referring to figure 1 only constitutes an example non-limiting application of a pump according to the invention.

Also, an expert in the field will understand easily that the embodiment of said pump that just being described only constitutes a non-limiting example with with respect to which numerous variants may be provided, in particular in regard to the conformation of depressions 79 and 89 and to the mode of operation of the piston 36 in its movement simultaneous rotation and axial reciprocating with respect to the cylinder axial 35, in addition to the variants described above that They have illustrated or not.

Claims (18)

1. Pump of the type comprising:

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a cylinder (35) having an axis (6) and defining a blind cavity delimited by a cylindrical inner peripheral face (42) of revolution around the axis (6) and by a first bottom (43), presenting the inner peripheral face (42) a first entry (7) and a first outlet (11) of fluid to be pumped, arranged in positions at least radially opposite in shape approximate with respect to the axis (6) and extending each in less than 180º with reference to the axis (6),

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a piston (36) disposed in the cavity (35) and delimited by one face cylindrical outer peripheral (74) of revolution around the axis (6) with a diameter substantially identical to that of the face inner peripheral (42) of the cavity (41), to establish a mutual contact sliding and tight to the fluid to be pumped, and by a first front face (75) located in front of the first bottom (43) of the cavity (41), presenting the outer peripheral face (74) of the piston (36) a first localized depression (79) adjacent to the first front face (75) and extending in less than 180º with reference to the axis (6), such that the first depression (79) and the first front face (75) of the piston (36) delimit with the face inner peripheral (42) and with the first bottom (43) of the cavity (41) a first sealed chamber (82) capable of being placed in communication alternately with the first entry (7) and with the first exit (11) without being able to communicate at the same time with the first entry (7) and with the first exit (11),

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some means (38, 71, 75, 93) to animate the piston (36), with respect to the cylinder (35), with a simultaneous rotation movement (39) around the axis (6), in a constant sense, and reciprocating (40) to along the axis (6), so that the piston (36) passes successively and cyclically, with respect to the cylinder (35):

?

to suction positions by the first chamber (82), in which the first depression (79) faces the first entrance (7) and the first front face (75) progressively moves away from the first fund (43), as it produces rotation, in order to progressively increase the volume of the first camera (82), and

?

to drive positions by the first chamber (82), in which the first depression (79) faces the first exit (11) and the front face (75) is progressively approaches the first fund (43), as it produces rotation, in order to progressively reduce the volume of the first camera (82).

characterized because

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the cavity (41) is delimited, axially opposite the first bottom (43) with respect to the first entry (7) and the first exit (11), for a second bottom (87), and its inner peripheral face (42) presents, in respective positions axially displaced with with respect to the respective positions of the first entry (7) and of the first exit (11), in the sense of a distance with with respect to the first bottom (43), and forming the same angle determined with reference to the axis (6), with respect to the positions of the first exit (11) and the first entry (7), a second outlet (12) and a second fluid inlet (8) at pump, extending each one in less than 180º with reference to the shaft (6),

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he piston (36) is delimited, axially in front of the first face frontal (75) with respect to the first depression (79), by a second front face (88) located in front of the second bottom (87) of the cavity (41), and its outer peripheral face (74) presents, in an axially displaced position with respect to the position of the first depression (79), in the sense of a distance from to the first front face (75) and forming said determined angle, increased by 180º, with respect to the position of the first depression (79), with reference to axis (6), a second depression located (89) adjacent to the second front face (88) and that extends in less than 180º with reference to the axis (6), so that the second depression (89) and the second front face (88) of the piston (36) delimit with the outer peripheral face (42) and with the second  bottom (87) of the cavity (41) a second sealed chamber (83) capable of communicating alternately with the second input (8) and with the second output (12) unable to communicate at the same time with the second entrance (8) and with the second exit (12), and tightly insulated from the first chamber (82), such that, during said movement of the piston (36) with with respect to the cylinder (35):

?

the suction positions by the first chamber (82) correspond to drive positions by the second chamber (83), in which the second depression (89) faces the second exit (12) and the second front face (88) progressively approaches the second fund (87) in order to reduce progressively the volume of the second chamber (83), and

?

drive positions by the first chamber (82) correspond to suction positions by the second chamber (83), in which the second depression (89) faces the second inlet (8) and the second front face (88) progressively moves away from the second fund (87) in order to increase progressively the volume of the second chamber (83).

2. Pump according to claim 1, characterized in that said angle has a value selected from a group between the value 0 ° and the value 180 °. 3. Pump according to any of claims 1 and 2, characterized in that the means (38, 71, 75, 93) for animating the piston (36) with said movement with respect to the cylinder (35) comprise a receiving shaft (84) integral with of the piston (36), which forms a coaxial projection on the second front face (88) of the piston (36) and which crosses the second bottom (87), and driving means (38, 93) of said receiving shaft (84 ) located outside the cavity (41), the receiving shaft (84) being delimited, in the sense of a distance from the axis (6), by a cylindrical outer peripheral face (101) of revolution around it, with a diameter smaller than the outer peripheral face (74) of the piston (36), and the second bottom (87) having the shape of a revolution ring around the shaft (6), which has an inner periphery in sliding contact and sealed with the outer peripheral face (101) of the receiving shaft (84). Pump according to claim 3, characterized in that the second bottom (87) is constituted by an annular joint (86) of revolution around the axis (6), which has an outer periphery in solidary and sealed contact with the inner peripheral face ( 42) of the cavity (41). 5. Pump according to any of claims 3 and 4, characterized in that the drive means (38, 93) of the receiving shaft (84) comprise motor means (38) having a drive shaft (85) coaxial to the receiving shaft (84 ), fixed axially with respect to the cylinder (35) and dragged in rotation around the axis (6), in that sense, with respect to the cylinder (35), and means (93) for mechanical connection between the drive shaft (85) and the receiving shaft (84), which ensure mutual solidarity in rotation around the axis (6) and an elastic thrust of the receiving shaft (84), with respect to the cylinder (35), in an axial direction from the second face front (88) of the piston (36) towards the first front face (75) of the piston (36), and because the first front face (75) of the piston (36) and the first bottom (43) comprise means (75, 71) forming a cam, in mutual axial support, to translate the rotation of the piston (36) around the axis (6), with respect to the cylinder (35), in an axial reciprocating motion. 6. Pump according to claim 5, characterized in that the first front face (75) has the form of an oblique skirt with respect to the axis (6) so that it approaches axially to the second front face (88) when radially approaching the first depression (79), and because the first bottom (43) has a localized support (71) for said oblique skirt, in an area displaced with respect to the axis (6) and located downstream of the first and second exits (11, 12) and upstream of the first and second entrances (7, 8) with reference to said direction, substantially at 90 ° with respect to the first and second exits (11, 12) and the first and second entrances (7, 8), with reference to the axis (6). 7. Pump according to any of claims 1 to 6, characterized in that the first inlet (7) and the first outlet (11) have a substantially identical section. 8. Pump according to any of claims 1 to 7, characterized in that the second outlet (12) has a section greater than that of the second inlet (8). 9. Pump according to any of claims 1 to 8, characterized in that it comprises, within the second outlet (12), a partition (106) arranged according to an average surface (plane 9) generated by generatrices parallel to the axis (6 ) and which subdivides the second outlet (12) into two ducts (104, 105) of constant respective section. 10. Pump according to claim 9, characterized in that the two ducts (104, 105) have substantially the same section. 11. Power installation of a liquid consuming device (1), such as a burner liquid fuel, with said liquid capable of containing a gas, from a tank (2) containing said liquid and more or less volatile substances capable of generating said gas, said installation comprising means (5) for pumping said liquid in the tank (2) by means of a degasser (15) of which a lower part is intended to contain a variable amount (20) of said liquid and an upper part is intended for contain a variable amount (21) of said gas and, where appropriate, of said liquid, characterized in that the pumping means (5) are constituted by a pump (5) according to any one of claims 1 to 10, of which the first inlet (7) and the first outlet (11) are respectively connected to the lower part of the degasser (15) and the consumer device (1) and of which the second inlet (8) and the second outlet (12) are connected respectively to the upper part of the degasser (15) and to the tank (4). 12. Installation according to claim 11, characterized in that the shaft (6) is substantially horizontal and that the first and second outlets (11, 12) are turned upwards. 13. Installation according to claim 12, characterized in that the pump (5) is oriented such that the second outlet (12) is arranged on one side of a vertical plane (102) that includes the shaft (6), this side being chosen such that said direction (39) is ascending there.

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14. Installation according to claim 13, characterized in that the second outlet (12) is connected to the tank (4) by a pipe (28) internally subdivided into a part of its length, adjacent to the second outlet (12), in a lower duct (104), upstream with reference to said direction (39), and in an upper duct (105), downstream with reference to said direction (39), which have constant respective sections, by a partition (106) arranged according to an average surface generated by generatrices parallel to the axis (6). 15. Installation according to claim 14, characterized in that said sections are substantially identical. 16. Installation according to any of claims 13 to 15, characterized in that the second inlet (8) is connected to the upper part of the degasser (15) by a pipe (14), which forms an elbow (107), convex down, in the vicinity of said second inlet (8), at a level lower than that of the latter, and has a section (108) narrowed internally from a lower area of said elbow (107) to said second inlet (8). 17. Installation according to any of claims 11 to 16, characterized in that it comprises a non-return valve (32) that passes from the second outlet (12) to the tank (2). 18. Installation according to any of claims 11 to 17, characterized in that it comprises controlled means (27) for interrupting the connection between the first outlet (11) and the consumer device (1).