FR2564154A1 - ROTARY PUMP WITH VARIABLE ECCENTRICITY AND OSCILLATING VANES - Google Patents

Abstract

ROTARY VANE PUMP, WITH VARIABLE ECCENTRICITY, IN WHICH THE CYCLIC VARIATION OF THE PROEMINENCE OF THE PALLETS 21 ON THE CYLINDRICAL AREA OF THE ROTOR 11 IN A WAY TO KEEP THEIR RIGHT END 45-46 IN CONSTANT CONTACT OR IN ANY CASE A SHORT DISTANCE FROM THE SUPERIOR INTERNAL CYLINDRICAL OF STATOR 16-16, IS DETERMINED BY THE CYCLIC OSCILLATION OF EACH OF THE PALLETS 21 ON ITS SHAFT 10 PARALLEL TO SHAFT 12 OF ROTOR 11 AND SUPPORTED BY THIS, GUIDED OSCILLATION AND REGULATED BY MEANS OF A DEVICE SPECIAL 24-25 FOR GUIDANCE AND REACTION TO FLUID PRESSURE.

Description

i Rotary pump with variable eccentricity and oscillating vanes

  the most well-known commercially available pumps are

  with pistons, gears or paddles.

  Although having an excellent volumetric yield and allows-

  so many great elevations, the piston pumps

  have very complicated means of varying their cy-

click.

  Gear pumps are relatively expensive and do not

  not change the cyclic range.

  Radial vane pumps have a big sealing problem; the pressures that can be reached and the

yields are therefore modest.

  In addition, they are delicate, have a high sensitivity

  lity to oil pollution from metallic particles

  metal and their initiation of suction requires a high number

of turns.

  The invention in question eliminates the above drawbacks and

  brings other important benefits, as will be illus-

very further.

  In rotary vane pumps, with eccentricity between rotor and stator, the position of the vanes relative to the rotor must have a cyclic variation so that their position

  is constantly maintained, i.e. for main-

  keep their tip, anytime, in touch or brief

  distance, from the internal cylindrical area of the stator.

  If we take into account the eccentricity between rotor and stator,

  the prominence of the end of the pallet must vary cycli-

  only during each turn in relation to the cylinder area

rotor blade.

  According to the present invention, this is obtained by the oscilla-

  tion of each pallet, around a tree parallel to the ar-

  bre of the rotor and supported by it, by means of a device

  special guide and reaction to fluid pressures

on the palette itself.

  This device, in a preferred type of embodiment, comprises a small arm eccentrically secured to the shaft of each pallet and arranged so that its geometric axis is approximately in alignment with the end of each

palette.

  This arm is provided with a sliding means., Such as rolls-

  ment with rollers or other, on a circular path co-ax ale and integral with the stator therefore automatically adapting to the possible variation of eccentricity of the stator relative to the

  rotor, while maintaining the guide and the oscillation-

tion of pallets.

  The rotor is substantially formed of two cylindrical lateral parts, joined by an intermediate body also cy-

  lindrique, of adequately smaller diameter.

  It is thus possible to accommodate, in the annular cavity

  resulting from the difference in diameters, the cylindrical part

  of the stator facing this central body of the rotor.

  A series of orifices provided on the rotor, parallel to its shaft, equidistant from the latter and having a constant angle value, result, in the cylindrical region of the rotor, open in the direction opposite to the axis of this last: and thus communicating with the annular zone created between stator

and rotor.

  The cylindrical orifices accommodate the cylindrical oscil-

  lants of the pallets obtained by flattening the central area

  trale of trees, a short distance from their geometric axis, coinciding with the nnuiaire zone existing between rotor and stator. The flattened part of the pallets constitutes the front of reaction to the pressures of the fluid, while the convex part forms

  the oscillating back inside the housings on the rotor.

  An eccentric mass is integral with each shaft forming the pallets, in an angular position capable of creating a centrifugal force tending to maintain the bearing of the arm of

  guide and reaction er. direction of the circular track co-

  axial and integral with the stator and therefore maintain the end

  pallets to the internal surface of the stator.

  The stator can perform a translational movement relative to

  port to the rotor so as to vary the eccentricity and therefore the size of the chambers which form cyclically between the vanes and the opposite cylindrical surfaces of the rotor

  and the stator, thus varying the cyclic range of the pump.

  The translation of the stator also determines that of the track

  co-axial circular which directs the guide and reaction arms

tion integral with the pallets.

  The translation of the stator is determined by the thrust given by a screw member to which a reaction spring is opposed,

  thus making possible a precise and meticulous adjustment of the ex-

  centricity. In a preferred embodiment, the rotor is in one piece while the stator is constructed in two pieces to allow its accommodation in the space existing between the

  two cylindrical lateral parts of the rotor.

  The seal between the dorsal part of the pallet and its semi-cylindrical seat on the rotor, in which it can oscillate, is ensured by a longitudinal lining inserted

  in a housing in this back part.

  The contact between the internal cylindrical surface of the stator and the end of the vanes, is made through the fluid, in this case. oil, which passes through this end; all this

  with minimum friction and ease and tightness

  ximum. The characteristics and aims of this invention will be made even clearer by the exemplary embodiments which

  follow, accompanied by schematic figures.

  Figure 1 is a perspective pump; Figure 2 is a cross section The pump comprises a series of radial vanes 21 obtained

  by flattening the trees 10, subs-

  both made up of a cylinder and housed in the ori-

  parts 51 of the rotor body, integral with the shaft 12 rotating on the bearings 13-14 (fig. 1). Inside the annular central cavity 15 presented by the rotor, is housed the stator provided in two halves 16, 16 ', with flat base 17 sliding on the rollers 18 placed

  on the bottom of the carcass 19, with the interposition of the cage 20.

  The trees forming the pallets are supported on both sides.

  ted by roller bearings 22 and 23, and have at one end the pivot 25 of reaction with bearing 24 mounted in

  projection and in an eccentric position relative to the geo-axis

  metric of rotation of the pallet 21, and the mass of balance

brage 26.

  The bearing 24 travels by rolling the circular track 27

  with annular edge 28 coaxial with the stator and made integral

  re of it by the cylindrical body in bucket 29.

  On one side, the stator 16 is in contact with the screw 30 screwed

  on the cover 31 integral with the carcass 19.

  On the side opposite to the screw 30, there is the contrasting elastic reaction

  aunt of the cylindrical helical spring 32, threaded into the

  ment 33 integral with the carcass 19, by means of

  the tip 35 of the cup 34 secured to the rod 34.

  The spring pressure is adjusted by the handwheel 36 screwed on

  the hollow element 33 pressing on the spring by means of

re of the spacer ring 37.

  On the carcass 29, is applied the tubing 38 communicating with the orifice 39 of the stator via the tube

elastic 40.

  In its lower part, the stator presents a series of ori-

  fices 41, which open into the conduit 42 communicating with

  the lateral tubing -43 by the small intermediate pipe 44.

  The right end, such as 45-46, of two contiguous pallets, is held against the internal surface of the stator, by creating,

  gradually, rooms such as 47 (fig. 2) of your

variable lume.

  The variation will be greater or less depending on the eccentricity

  of the position of the rotor 11 relative to the stator 16-16 '.

  The ends 45-46 of each of the pallets are presented

  more or less in alignment with the axis 50 of the reaction pivot.

  A seal 48 is provided on the convex back

of each pallet.

  The sucked fluid enters the tubing 38 and, through the ori-

  fice 39, arrives in rooms 47de. variable volume o, by the effect of the rotation of the rotor 11, it is compressed

  and sent into the discharge conduit 42.

  The bearing 24 of the pivot 25 of each of the pallets, slides

  sant on runway 27, opposes fluid pressure in

the palette.

  The vanes, while oscillating cyclically around the axis of the shaft 10, over a determined angle of the eccentricity between the rotor and the stator, maintain, by the effect of the pivot 25, their

  straight ends, such as 45, 46, roughly constam-

  in contact with the internal cylindrical surface of the stat

  tor or anyway a short distance from it.

  If one wishes to vary the cyclic range of the pump, one acts on the screw 30, changing, relative to the rotor 11, the position and the eccentricity of the stator 16-16 ′ and consequently of the

track 27.

  By effect of the centrifugal force, the balancing mass 26 will collaborate with the bearing 24 to maintain constantly

  pallets in optimal stability.

  Large lifting height and high volumetric efficiency.

  Absence of vibrations Robustness, high reliability and duration Quick and easy adjustment of the cyclic flow of pressure and power. Extended operating regime, at a low or high number of revolutions. High ratio between room volume, size

and the weight.

  Simplicity of construction and reduced cost of production.

  Given that the applications of this invention have been described by way of indicative and nonlimiting example, it is understood that any equivalent application of the concepts of invention presented, and any product produced and / or operating according to the characteristics of the invention, will fit in

his. protection area.

$ s 2564154

Claims (10)

Claims   1. Rotary vane pump, with variable eccentricity, characterized in that the cyclic variation of the prominence of the vane 21 relative to the cylindrical surface of the   rotor 11, to maintain their straight end 45-46 constam-   ment in contact, or in any case at a short distance from the internal cylindrical surface of the stator 16-16 ′, is determined by the cyclic oscillation of each of the vanes 11, on a shaft 10 parallel to the shaft 12 of the rotor 11 and supported   by the latter, oscillation guided and regulated by a device   tif 25-24 of guide and reaction to fluid pressures.   2. Rotary vane pump, with variable eccentricity,   vant claim 1, characterized in that the device 25-24 guide and reaction consists of an arm 25, eccentrically integral with the shaft 10 of each pallet and whose geometric axis 50 is approximately aligned at the right end 45-46 thereof, provided with a means 24 for sliding on a circular track 27 coaxial and integral with the stator 16-16 ', so that the guide and regulation of the prominence formed by the   paddles on rotor 11 automatically adapts to the varia-   possible eccentricity of the stator 16-16 'relative to to rotor 11.   3. Rotary vane pump, with variable eccentricity, before claim 1,   characterized in that the rotor 11 is substantially shaped   mé of two cylindrical lateral parts, connected by an intermediate cylindrical body of dianmeter suitably lower with a thickness making it possible to accommodate the stator 16-16 ′ in the annular cavity 15 resulting therefrom, the rotor 11 having,   with a constant angle value, a series of cy-   lindrics parallel to the shaft 12 of the rotor and at equal distance from the latter, these orifices being, coincident with the body   cylindrical intermediate, open from the part opposite to the 9- 2564154   bre 12 of the rotor 11 so as to communicate with the annu-   area 15 created between stator and rotor, these orifices 51 constitute   killing the support of the cylindrical, oscillating shafts 10, of the pallets 21 obtained by flattening the central zone of the shafts 10 at short distance from their geometric axis coincidentally.   ce of the annular zone 15 between rotor and stator.   4. Rotary vane pump, with variable eccentricity, according to claim 3, -   characterized in that each of the pallets 21 has a constant cross section substantially in a semicircle, the flat part constituting the front which reacts to pressures   of fluid and the convex part, the back oscillating in its lo- on the rotor.   5. rotary vane pump, with variable eccentricity, according to claim 1,   characterized in that the rotor 11 is in one piece tan-   say that the stator is built in two pieces 16-16 '.   6. rotary vane pump, with variable eccentricity, according to claim 1,   characterized in that the stator 16-16 'can perform a movement   translation gear relative to rotor 11, in order to vary relative eccentricity.   7. rotary vane pump, with variable eccentricity, according to claim 6,   characterized in that the translation of the stator 16-16 'is de-   terminated by the thrust given by a screw member 36, to which   opposes a reaction spring 32.   8. rotary vane pump, with variable eccentricity, according to claim 1, characterized in that the fluid, in this case oil, which passes between the right end 45-46 of the pallets 21 and the area   internal cylindrical of the stator 16-16 ', creates a palet-   te-stator through the fluid, with minimal friction   and maximum ease of sliding.   9. Rotary vane pump, with variable eccentricity,   vant claim 1, characterized in that the fluid is sucked radially and expelled tangentially.   10. Rotary vane pump, with variable eccentricity,   according to claim 1, characterized in that each shaft 10 forming the pallets   21 is integral with an eccentric mass 26, of suitable dimensions   quates and positioned to determine a centric force   fuge directed so as to push the end of the pallets -46 towards the internal cylindrical surface of the stator 16-16 '   to cooperate with the guide and pressure response device sions of the fluid.