Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C2/00—Rotary-piston machines or pumps
  • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
  • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
  • F04C2/107—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth
  • F04C2/1071—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type
  • F04C2/1073—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type where one member is stationary while the other member rotates and orbits

Definitions

• the invention relates to a rotary volumetric machine in which the capsulism is formed by a male part and a female part (tubular body) which surrounds it.
• the external surface of the male part, which we call male surface, and the internal surface of the female part, which we call female surface, are helical surfaces whose axes are parallel and distant by a length which we denote by E.
• These surfaces are defined around these axes by the nominal profile which they have in any section perpendicular to the axes (straight section) and by their respective pitch P m and P f .
• P f are finite, result from the in principle linear contacts between the male surface and the female surface, which the relative movement of these two surfaces displaces in space.
• the director of the male surface which we call male profile, has an order of symmetry n m around its center which is the point of breakthrough O m of the axis of the male surface in the profile plan.
• This profile is inscribed in the circular crown of center O m , of width 2E and of average radius R ° m.
• the director of the female surface which we call female profile, has an order of symmetry (n m +1) around its center which is the point of piercing 0f of the axis of the female surface in the plane of the profile.
• the mean radius R ° m can be considered as the parameter determining the scale of the cross section of the capsulism and the parameter E as a shape parameter.
• the male part is in planetary movement relative to the female part.
• the first rotation of this planetary movement causes the axis of the male surface to describe, at any speed ⁇ , a cylinder of revolution of radius E around the axis of the female surface.
• the second rotation composing the relative planetary movement causes the male part to rotate around the axis of the male surface at the speed (- ⁇ / n m ).
• the known machines corresponding to this description, in which P m and P f are finished, are in particular used as downhole motors in oil, gas or geothermal drilling, where their slender cylindrical external shape is directly exploitable.
• the female part most often belongs to the stator and the relative planetary movement of the male part with respect to this female part is therefore identified with its absolute movement.
• the male and female profiles of the helical surfaces used in these machines are described by W.
• TIRASPOLSKY (Hydraulic bottom motors, drilling courses, pages 258 and 259, Editions TECHNIP PARIS 15 è ): the male profile is supposed to be the curve at uniform distance D of the ordinary trochoid of order of symmetry n m and the female profile of mean radius R ° m + E is supposed to be the curve at the same uniform distance D of the ordinary trochoid of order of symmetry (n m + 1).
• the machines according to the invention eliminate these drawbacks by proposing male and female profiles, the association of which has new or unexploited properties.
• the male profile has the following properties:
• a current point U which traverses the profile from the point of maximum polar radius (R max ) to the point of minimum polar radius (R min ) determines a polar radius whose decrease is monotonous
• R A2 / R A0 - (R A1 / R A0 ) 4
• the female profile is identified with the outer material material envelope complete with a male profile satisfying the preceding conditions in its relative planetary movement.
• this point traverses, in a single direction, all the segments such as R max A; on the female profile, this point describes successively and in the same direction, (n m + 1) disjoint arcs.
• these arcs closing arcs they are tangentially connected to the pipe arcs at 2 (n m +1) junction points J.
• each point such as A belonging to the male profile comes successively into contact with all the junction points J belonging to the female profile and with them only, in the relative planetary movement of the male profile with respect to the profile female.
• the normal gc at the semi-arc of pipe cuts the circumference C pf in two points C 1 and C 2 , the point C 1 moving from M 1 towards J 1 and the point C 2 moving from M2 towards J2, when C traverses the segment MJ.
• the driving half-arc is freely chosen.
• This driving arc is repeated n m times, by rotation around O f of the angle 2 ⁇ / (n m + 1), in order to respect the order of symmetry of the female profile.
• the driving arc can in principle have points with abrupt variation in curvature and even angular points provided that these points respect the symmetry imposed on the driving arc; in particular, the driving arc can be a polygonal line.
• first reference segment Tfi which identifies with a line segment perpendicular in M to gM
• second reference segment ⁇ f2 which identifies with an arc of circumference centered on gM at a distance R f2 from O f such that R f2 is greater than R ° m .
• the radius of this arc of circumference is equal to R f2 - R ° m .
• the resulting segment is identified with a half-arc possible conduct.
• Z C Z U expi [(- 1 / n m +1) ⁇ ] - E ⁇ 1-expi [(n m / n m +1) ⁇ ] ⁇ (II) the n m other corresponding driving arcs in the order symmetry (n m +1) around the point O * f .
• the closing arcs of the female profile belong to a hypertrochoid with double points, of order of symmetry (n m +1) around O * f .
• the affix (Z F ) of a current point F belonging to this closing arc is written, in the same complex plane as that where the equalization of the driving arcs is specified:
• Z F Z U expi ⁇ [(n m -1) / (n m +1)] ⁇ ...
• the profiles thus defined form a fictitious capsulism where the distance between centers E is identical to that of real capsulism, where the crown containing the male profile has an average radius equal to R ° m - D and where the crown containing the female profile has an average radius equal to R ° m + E - D, the distance D being counted positively in the centrifugal direction and any curve at a negative distance D of the profiles forming the fictitious capsulism can only be retained if it has no double dots.
• the male and female helical surfaces of the machines according to the invention are the only surfaces found so far which can both belong simultaneously to rigid parts. They are both machinable. They also allow adaptation of the shapes to particular requirements by the richness of the definition of the male and female profiles they use.
• the helical surfaces can degenerate into cylindrical surfaces, the reverse of the male (1 / P m ) and female (1 / P f ) pitch tending towards zero. These surfaces are then entirely defined by their cross section.
• the working chambers are closed axially by flanges and the fluid can be admitted radially into the capsulism and / or escape from it. in the same way.
• machines conforming to the invention are excluded those whose male profile is a hypertrochoid.
• the closing arcs are no longer essential for closing the chambers. They can be replaced by arcs which are external to them with lesguels the male profile no longer comes into contact. Whether they include helical or cylindrical capsulism, the machines according to the invention lend themselves to all combinations of absolute movements making it possible to carry out the relative planetary movement of the male part with respect to the female part. In fact two possibilities are of obvious practical interest.
• the female part belongs to the stator, the female surface and profile can then be gualified with statorigues.
• the relative planetary movement of the male part becomes absolute and the male part constitutes the rotor of the machine.
• the part of the stator limited by the statorigue surface must consist of a layer of elastomer, the thickness of this layer can be limited to a minimum, since the stator and rotor surfaces being strictly combined slip, no local deformation should be expected to compensate for a meshing fault. This results in particular in a reduction and a regularization of the parasitic resistances to the movement.
• the male part can be linked to a primary shaft coaxial with the female surface by an open cinematic chain successively constituted by an O-ring connection. an intermediate shaft and a second O-ring connection, a thrust bearing being interposed between the primary shaft and the stator to prevent any translation of the male part along its axis.
• an open cinematic chain successively constituted by an O-ring connection.
• an intermediate shaft and a second O-ring connection a thrust bearing being interposed between the primary shaft and the stator to prevent any translation of the male part along its axis.
• this movement can result from the articulation of the male part on a bent shaft in rotoidal connection with the stator, around the axis of the female surface and the existence of a transmission ratio n m / n m +1 linking the male and female parts.
• the male part is in rotoidal connection with a stator around the axis of the male surface and the female part is in rotoid connection with the stator around the axis of its internal surface (female surface), the relative planetary movement being imposed by a transmission of ratio n m / n m +1 connecting the male and female parts.
• the transmission of ratio n m / n m +1 binding the male and female parts can result from direct contact between the male surface and the parts of the female surface which have the driving arcs as their guide, if the fluid with which the machine exchanges energy is a liquid having a lubricating action on the surfaces in contact, or a gas charged with such a liquid. Otherwise, the tolerances on the male and female surfaces must allow a small play in their meshing and the relative planetary movement must be imposed by a transmission external to the capsulism, which impose the game.
• the female part (tubular body) can be produced in several identical sections, of slight slenderness, limited by planes perpendicular to the axis, identified and assembled to form a single organ. .
• FIGS 1 to 27 show particularizations and applications of the above.
• Figure 1 relates to the state of the art.
• Figures 2 to 6 illustrate the general method of defining male and female profiles for machines according to the invention.
• Figures 7 and 8 relate to the direct definition of male profiles for machines according to the invention.
• Figures 9 and 10 relate to the construction of female profiles combined with the male profiles of Figures 7 and 8 respectively.
• FIGS. 11 to 19 show, on a smaller scale, the evolution of the cross section of a chamber delimited by the profiles constructed in FIGS. 7 and 9 respectively, this evolution being an essential characteristic of any machine according to the invention, gu'elle unambiguously identifies it by contribution to any known machine.
• Figures 20 and 21 respectively represent a machine according to the invention in which the tubular body (female part) is fixed in the stator and, on a larger scale, the corresponding helical capsulism.
• FIG. 22 is extracted from FIG. 21 and represents, on a still larger scale, stator removed, the contact lines of the male surface with the female surface and the manner in which these lines delimit the chambers of the capsulism.
• Figures 23 and 24 show, in what it has essentially, a machine according to the invention, comprising a helical capsulism, in the laguelle the male part and the female part are each in rotoidal connection with the stator.
• Figures 25 and 26 show two sections in a machine according to the invention, in the laguelle the tubular body
• mistletoe (female part) is fixed in the stator, mistletoe has a bent shaft and whose capsulism is cylindrical.
• FIG. 27 represents a machine according to the invention comprising a helical capsulism whose tubular body is produced in several identical sections.
• FIG. 1 recalls the construction of the current point ⁇ o of an ordinary trochoid Tord of center 0 and of order of symmetry n, for a value of the configuration parameter which locates the point U 0 in the vicinity of a point of rebrow seed B 0 .
• the figure also shows the construction of the point U of the Te ⁇ curve at uniform distance D of this trochoid ⁇ ord , for the same value of the configuration parameter K.
• Figure 2 illustrates the properties imposed on the profile male 1.
• FIG. 3 illustrates the properties of the driving arc 2 belonging to the female profile of the machine shown diagrammatically in FIG. 4.
• Figure 4 shows a computer modeling of male and female profiles of a machine according to the invention where the half-arc of the pipe is characterized by the following parameters defined according to the indirect method:
• FIGS. 5 and 6 show, with the notations of FIG. 4, two other models of machines in accordance with the invention, characterized respectively by the following parameters defined according to the indirect method:
• the profile is constructed in the system of axes O m XY and the point ⁇ corresponds to a current value ⁇ of the configuration parameter.
• the vector O m U results from the composition, according to the equation (I), of a first vector O m V of module R ° m inclined by the angle ⁇ on the axis O m X, of a second vector vw of module 3E / 2 inclined by the angle (-2 ⁇ ) on the first and of a third vector WU of module E / 2 inclined by the angle (4 ⁇ + ⁇ ) on the second.
• the profile is constructed in the system of axes O m XY and the point U corresponds to a current value ⁇ of the configuration parameter.
• the vector O m U results from the composition, according to equation (I), of a first vector O m V of modu the R ° m inclined by the angle ⁇ on the axis O m X and of a second vector seen from module E inclined by the angle (-2 ⁇ ) on the first.
• the normal gu in U passes through the point U 1 of the circumference C pm and cuts this circumference a second time at the point U 2 which determines the angle ⁇ as above.
• FIG. 9 shows the construction of a current point C belonging to the driving arc 2 and a current point F belonging to the closing arc 3 of the female profile 23, which will come into contact at different times with the same point U of the male profile represented in FIG. 7.
• the female profile to which the points F and C belong is traced in the same system of axes O m XY as the male profile.
• the vector O m C results from the composition, according to equation (II), of a first vector O m C 3 which is the vector O m U of FIG. 7 turned by the angle (- ⁇ / 3), a second vector C 3 C 4 of module E inclined by the angle ⁇ over O m X and a third vector C 4 C of module E inclined by the angle (2 ⁇ / 3) over O m X.
• the vector O m F results from the composition, according to the equation (III), of a first vector O m F 3 which is the vector O m U of FIG. 7 turned by the angle ( ⁇ / 3), a second vector F 3 F 4 of module E inclined by the angle ⁇ over O m X and a third vector F 4 F of module E inclined by the angle (-2 ⁇ / 3) over O m X.
• FIG. 10 shows, in the same way as FIG. 9, the construction of a current point C belonging to the driving arc 2 and a current point F belonging to the closing arc 3 of the profile female 23, which will come, at different times, in contact with the same point U of the male profile shown in figure 8.
• Figures 11 to 19 describe the very characteristic evolution of the cross section of a chamber delimited by the male and female profiles of Figures 7 and 9, in the planetary movement of the male profile relative to the female profile.
• the section of the chamber considered is hatched in all the figures where this section has a sufficient area for this to be possible.
• the arrow in solid line symbolizes the rotation of the male profile around the center Om gui is never designated, but identified by a small blackened circle.
• the dashed line arrow symbolizes the rotation of the center O m of the male profile around the center O f of the female profile.
• the shape of this section is that of a crescent and the ends of the crescent are obviously points of contact of the two male and female profiles.
• a point like gue C i describes the arc of conduct i indefinitely, in one direction then in the other, while gue F travels, always in the same direction, the hypertrochoid with double points, but is not material and therefore useful for closing a room during the period of time it traverses the arches of closure and it is only shown in FIGS. 11 to 19 during its presence on a single closing arc, where it is useful for reasoning.
• point C 1 arrives at the end of the arc of pipe which it describes, at the moment when point F enters on the closing arc which is connected to it.
• point F has reached the end of the closing arc when this same point is reached, on the pipe arc to which it also belongs, by point C 3 .
• the point F will disappear and the point C 3 will relay it to close the section of the chamber considered whose growth it will promote by turning back along its arc of conduct.
• the section of the chamber considered is limited by the points C 1 and C 3 which continue to move apart from one another along the female profile.
• point F has relayed point C 1 as the end of the section of the chamber. F has reached top of the closing arc, points C 3 and F progressing towards each other. The bedroom section will soon be canceled.
• Figure 20 shows an axial section in a machine according to the invention, comprising a helical capsulism, where the female part belongs to the stator - the female surface is identified with the stator surface - and where the planetary movement of the male part is therefore absolute.
• the rotor 5 externally limited by the rotor surface 50 and the stator tubular body 4 internally limited by the stator surface 40.
• the rotor 5 is guided in its planetary movement by the linear contacts between the stator and rotor surfaces and it is linked to the primary shaft 6 by the intermediate shaft 7 which, by means of O-rings materialized by Cardan joints 8 and 9, is linked respectively with the rotor 5 and with the primary shaft 6.
• This primary shaft 6 is prohibited any axial translational movement of the rotor 5 by its rotoid connection with the element 10 of the stator, connection produced by the radial plain bearings 11 and 12 and the stop 13 with multiple rows of rolling elements.
• the drilling mud which enters the capsulism through its open end section 60 exits therefrom through its open end 70 and is then directed towards the drilling tool fixed to the nozzle 14 by the threaded assembly 15, passing through the holes 16 and the bore 17 of the primary shaft.
• Figure 21 is a full axial section on a larger scale of the capsulism of the motor of Figure 20, supplemented of three straight sections in this capsulism.
• stator tubular body 4 and the rotor 5 whose respective profiles 23 and 1 appear in the transverse sections, as well as a part of the intermediate shaft 7 and its O-ring connection 8 with the rotor.
• FIG. 22 represents in axial section a part of the capsulism represented in FIG. 21, on a still enlarged scale to allow the visualization of the contact lines such as ⁇ 1 and ⁇ 2 which intersect at a point J a A. It appears that the contact lines axially point the chambers which they delimit, which is the case for all the helical machines which are the subject of the invention but is not for any other known machine of the same type where the order symmetry of the female profile exceeds that of the male profile by one.
• Figure 23 is an axial section in a machine according to the invention, comprising a helical capsulism, where the male and female parts of the capsulism are both in rotoidal connection with the stator.
• Figure 24 is a cross section along AA of the machine shown in Figure 23.
• This machine is a screw compressor for gas loaded with lubricant, so that the male part 5 externally limited by the male surface 50 to which the profile belongs male 1 can directly drive the tubular body 4 internally limited by the female surface 40 to which the female profile 23 belongs, without the intervention of a gear outside the capsulism.
• the stator comprising a tubular part 10, a flange 100 through the tube 101 which admits the fluid into the machine and a flange 110 through which is made, at 11, the outlet of the fluid compressed towards the outside of the machine.
• the flange 110 obviously only appears in FIG. 23.
• the admission of the fluid into the capsulism from the flange 100 is done by the extreme open section 60 of the capsulism and the exhaust of the compressed fluid towards the flange 110 is done by lights such as 41, open in the female surface and controlled by valves such as 42 (figure 24).
• the flange 110 completely closes the terminal section 70 of the capsulism.
• Figure 25 is a section perpendicular to the axes of male 50 and female 40 surfaces in a compressor according to the invention where the capsulism is cylindrical (case of degeneration).
• FIG. 26 is a section through a plane containing the axis of the female surface 40 in this same compressor.
• FIG. 25 a distinction is made between the driving arcs 511, 512 and 513, the closing arcs 514, 515 and 516, as well as the junction points such as J in which they are connected two by two. All of these six arcs are identified with the female profile drawn on another scale in Figure 4.
• Figure 27 is a partial section in a machine according to the invention which differs from that shown in Figures 25 and 26 by the non-materialization of the closing arcs such as 3, which are replaced by arcs such as 603 which are external to them, the contact corresponding to the closing point no longer being material.
• This figure is an axial section of the capsulism completed with a cross section in the joint plane 410.
• the sections 401 to 406 are fitted into the tube 411 and are compressed there by the end pieces 412 and 413 screwed into the threaded ends of this tube 411.
• Each section is marked angularly with respect to the neighboring sections by pins such as 414 engaged in bores such as 415 opening into the joint planes such as 410.
• pins such as 414 engaged in bores such as 415 opening into the joint planes such as 410.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Rotary Pumps (AREA)
• Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
• Applications Or Details Of Rotary Compressors (AREA)

Applications Claiming Priority (3)

Publications (2)

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• 1991
  • 1991-10-23 FR FR9113530A patent/FR2683001B1/fr not_active Expired - Fee Related
• 1992
  • 1992-10-15 CA CA002121131A patent/CA2121131C/fr not_active Expired - Fee Related
  • 1992-10-15 JP JP5507506A patent/JPH07501374A/ja active Pending
  • 1992-10-15 EP EP92924748A patent/EP0610435B1/de not_active Expired - Lifetime
  • 1992-10-15 WO PCT/FR1992/001010 patent/WO1993008402A1/fr active IP Right Grant
  • 1992-10-15 DE DE69203728T patent/DE69203728T2/de not_active Expired - Fee Related
  • 1992-10-15 US US08/211,713 patent/US5439359A/en not_active Expired - Fee Related
• 1994
  • 1994-04-22 NO NO941482A patent/NO306643B1/no not_active IP Right Cessation

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