Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
  • B04B—CENTRIFUGES
  • B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
  • B04B1/02—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles without inserted separating walls
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D19/00—Degasification of liquids
  • B01D19/0042—Degasification of liquids modifying the liquid flow
  • B01D19/0052—Degasification of liquids modifying the liquid flow in rotating vessels, vessels containing movable parts or in which centrifugal movement is caused
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
  • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
  • D21D5/26—De-aeration of paper stock
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
  • F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
  • F04D7/04—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous
  • F04D7/045—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous with means for comminuting, mixing stirring or otherwise treating
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
  • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
  • F05B2210/00—Working fluid
  • F05B2210/10—Kind or type
  • F05B2210/13—Kind or type mixed, e.g. two-phase fluid
  • F05B2210/132—Pumps with means for separating and evacuating the gaseous phase

Definitions

• gas enclosed or generated in a fluid causes problems.
• the gas disturbs the pumping; air enclosed in reagents and solvents may disturb a chemical process; air and gas bubbles in the fuel and/or oil feed may cause disturbances in combustion engines; the forming of paper requires suspensions essentially free of gas bubbles, etc.
• Fr is the Froude number
• u is the flow speed
• h is the layer thickness
• g is the force of gravitation. If Fr>l the flow is rapid and if Fr ⁇ 1 the flow is tranquil. There is no intermediate flow speed, which means that if a rapid flow is slowed down, a hydraulic jump will take place at the transition between rapid and tranquil flow. This phenomenon is known in the art of fluid flow in open channels, etc. and it is utilized among others in water power stations. It has, however, not so far been utilized in connection with the centrifugal separation of gases from liquids nor in the pumping of liquids.
• the second separation section 33 may be cylindrical or it may have a more distinctly conical form.
• the gas separation surface of said second gas separation section 33 may be equipped with bumps or other means disturbing the flow (see Fig. 3c) so that new hydraulic jumps occur if the flow speed tends to accelerate beyond a tranquil mode of flow. Such might be the case if so much liquid is drawn through outlet 28 that the depth of the fluid layer after transition ring 35 tends to decrease and the axial flow speed consequently to accelerate.
• transition means for defining and stabilizing hydraulic jumps There are many other shapes and forms of transition means for defining and stabilizing hydraulic jumps, as a person skilled in the art will appreciate, and it is clear that the present invention is not limited to the shown embodiments, which are intended only as illustrations of the invention.
• the apparatus will also provide great advantages in processes where separation of a gas from a liquid is required without the need for pumping. It is obvious for the persons skilled in the art that the separator can be used for many other purposes when gas is to be removed from a liquid, or a liquid containing gas is to be pumped substantially free of gas.

Priority Applications (1)

Applications Claiming Priority (4)

Publications (1)

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Family Applications (1)

Country Status (3)

Cited By (6)

Citations (3)

• 1995
  • 1995-06-21 FI FI953092A patent/FI953092A/fi not_active Application Discontinuation
  • 1995-12-21 AU AU42631/96A patent/AU4263196A/en not_active Abandoned
  • 1995-12-21 WO PCT/FI1995/000703 patent/WO1996019276A1/en active Application Filing

Patent Citations (3)

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