FR2685949A1 - DRIP COLLECTOR. - Google Patents

Abstract

Drop collector for collecting drops and for conveying the liquid, comprising one or more absorption surfaces (A) provided with a coating or made of an open porosity capillary material (CCS).

Description

i Drop collector The invention relates to a drop collector for

  the collection of drops and for the delivery of the liquid.

  Drop collectors are used in drop radiators Drop radiators are used

  in space for cooling coolants

  Dissement implemented for large thermal powers

  radiators They cool the coolant

  heated in a device such as a turbine or generator

  electric heater A liquid droplet radiator of this kind has been described in "Conceptual Design of a Liquid Droplet Radiator, Space-Flight Experiment" by

  S Pfeiffer and A White, SAE Technical Paper 89/565, 1989.

  The principle of the droplet radiator is that drops cooled by radiation move freely in space, from an ejector to a collector.

  drops is captured in the collector and transformed into a cou-

  rant of continuous liquid It is then a question of avoiding as much as possible losses of liquid by projection at the time of

  the impact of the drops on the collector The object of the invention is

  jet to offer a drop collector which avoids losses

  of liquid upon impact of the drops.

  According to the invention, this object is achieved by a collection

  drop tester which includes one or more ab-

  sorption with a coating or made of a ca-

pillar with open porosity.

  According to the invention, the drop collector comprises absorption surfaces made of a capillary material

  with open porosity (porous) or coated with such a material

  capillary The receiving device of the drop collector therefore consists for example of absorption surfaces arranged in a V, funnel-shaped, or grooved, rectangular or circular, made of a coarse capillary material with open porosity The rough surface decreases so in a completely decisive way the tendency for the projection of the incident drops. Because of the capillarity, the liquid of the drops is transported after the impact towards the interior, which

  prevents the formation of a film on the surface.

  results in a further reduction in the tendency to project

  tion. Inside the capillary material, the liquid is

  uniformly distributed by surface and trans-

  thus carried towards depressions of concentration In pre-

  seeing at this point an insert made of a porous material

  finer sity (the pore size is less than that of the material in the funnel), the collection of the liquid is

  improved again The surface forces are in-

  pouring proportional to the radii of the pores of the capillary materials Thus, the finer porosity material preferably used constitutes a concentration depression for a macropore material This micropore material is arranged for example at the outlet of the liquid from the capillary collector and discharges the liquid by capillarity of the macropore material

  until saturation is reached.

  The liquid is then transported by a pump.

  The evacuation of the fluid from the capillary material in the pipe requires the supply of energy The transport of the fluid out of the capillary material is done for example by a variation in volume, that is to say with positive engagement, at the help of a

  positive displacement diaphragm pump that can operate

  hydraulic or pneumatic and in which are provided

  different cells whose volume increases and decreases peri-

  which act thus on the liquid in the direction of delivery. The interior space of the pump is filled with a capillary material with reversible deformation (analogous to a sponge).

  The following description, next to the drawings

  appended as nonlimiting examples, will allow

  understand how the invention can be put into practice.

  FIG. 1 represents a drop collector according to the invention; Figure 2 shows the operating principle

  a feed pump according to the invention.

  FIG. 1 shows a drop collector with the absorption surface A Its shape is appreciably adapted to the flight of the droplets It can have a V-shaped, funnel-shaped, grooves or the like The absorption surface A consists of a porous capillary material (CCS, Coarse capillary structure) or coated with such a material on the receiving face of the droplets If the absorption surface A consists of the capillary material, it is possible to provide

  on the back side a sheet of teflon (ATF, anodized te-

  flon foil) which ensures the liquid tight seal to

  the back of the drop collector Inside the collection

  drop dripper shown here is arranged an insert consisting

  of a material with finer porosity (FCS, fine capillary struc-

  ture> This material is followed by the pump for the evacuation of

  liquid The pump used here is configured as a volumetric pump-

  trique (DP, displacement pump) On the far left is indicated

that the liquid outlet.

  The liquid to be collected arrives in the form of drops from the right (arrows in fig 1) The capillary structure

  CCS of the absorption surface A captures the drops and di-

  inwards towards the FCS collector insert.

  From there, they are evacuated by the DP pump.

  Fig 2 shows the action of the

  DP diaphragm positive displacement pump with hydraulic operation

  The pump here comprises a plurality of cells available

  a sees face to face or concentrically around a piece of capillary material The cells are interconnected by

  small diameter connecting conduits The first cel-

  It can be supplied with pressurized liquid.

  In the initial state (in fig 2 on the top left), the deformable capillary material provided inside the pump is not compressed The liquid flows by capillarity in the pumping zone In cycle 1, a liquid under pressure is pumped into the first cell (that 1> between the outer wall of the tube and the diaphragm, for example by the

  modification of the volume in a bellows The diaphragm loosens

  forms and closes the bond of the capillary material on the two

  sides of cell 1 In the extreme case, the material capil-

  the space between the cells is compressed to its volume

  clean Between the different cells 1, 2 and the other cells

  lules is provided each time with a small opening which represents

  hydraulic resistance in the sense that first of all the

  lule 1 is (substantially) completely filled before the

  cells 2 to N are filled in The supply of liquid under pressure

  additional space in the space between the diaphragm and the outer wall causes the diaphragm to move towards the center line and decrease the volume of the material

  capillary The contained liquid is expelled from the capil-

  laire. During cycle 2 (represented on the right side of fig 2, starting from the bottom), the pressurized liquid is again evacuated from the cells by elasticity effects

  in the capillary material and in the diaphragm The resistance

  hydraulic tance between the cells has the effect that the

  cell 1 is opened first Follow cell 2, cell

  lule 3 to cell n The speed of the pressurized liquid stream ensures that the working liquid is only discharged in the desired flow direction If the pump is opened too quickly, liquid already expelled from the material capillary can also be repelled by

  adhesion forces and fill the capillary material In re-

  vanche, if the opening occurs sufficiently slowly, the capillary action only flows back from the direction

  drops since cell N is still closed.

  The interior of the cells may be completely empty; likewise,

  it is possible to use in the cells a material ca-

  coarse capillary with open porosity In the case of use

  sation of a coarse capillary material with open porosity, this can replace a cellular structure A coarse capillary material with open porosity with suitable small communication channels can be used in place of the different cells The interior of the pump through which must be transported the liquid is however always filled with a

  hair material (micropore).

Claims (5)

  1 Drop collector for the collection of drops and for the transport of the liquid, because it includes one or more absorption surfaces (A) provided with a coating or made of a capillary material with open porosity (CCS).   2 drop collector according to claim 1, characterized in that the absorption surfaces (A) have   a shape in y, funnel or grooves.   3 Drop collector according to one of the claims   above, characterized in that it comprises a collecting insert made of a micropore capillary material (FCS).   4 Drop collector according to one of the claims   previous tions, characterized in that it comprises a pump   volumetric (DP) for liquid delivery.   Drop collector according to claim 4,   characterized in that it comprises a positive displacement pump   phragm (DP) with a plurality of cells arranged facing   face or concentrically which can be activated suc-   afterwards by means of compressed air or a hydraulic fluid   lique and which surround a capillary material with porosity or-   green and reversible deformation.   6 Drop collector according to one of the claims   tions 4 or 5, characterized in that a capillary material with reversible deformation is arranged inside the cells for hydraulic fluid.