Apparatus for maintaining solids in a suspension and a method of using it
First Claim
1. Apparatus for maintaining solids in suspension in a vat, said apparatus including a stirrer having rotating arms positioned within said vat, a source of liquid under pressure, a source of compressed gas, the improvement wherein said rotating arms comprise concentric, spaced inner and outer tubes, means for connecting said source of liquid to said space between said inner and outer tubes and said compressed gas source to said inner tube, and said inner and outer tubes containing aligned holes at longitudinally spaced positions along the complete length thereof and about the periphery of said tubes for simultaneously injecting liquid under pressure and compressed gas into said suspension as said arms rotate.
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Accused Products
Abstract
Apparatus for maintaining solids in suspension in a liquid mass contained in a vat. Liquid under pressure and compressed gas are injected simultaneously into the liquid by the stirrer arm at the bottom of the vat.
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Citations
11 Claims
- 1. Apparatus for maintaining solids in suspension in a vat, said apparatus including a stirrer having rotating arms positioned within said vat, a source of liquid under pressure, a source of compressed gas, the improvement wherein said rotating arms comprise concentric, spaced inner and outer tubes, means for connecting said source of liquid to said space between said inner and outer tubes and said compressed gas source to said inner tube, and said inner and outer tubes containing aligned holes at longitudinally spaced positions along the complete length thereof and about the periphery of said tubes for simultaneously injecting liquid under pressure and compressed gas into said suspension as said arms rotate.
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9. A method for maintaining solids in a suspension in a vat including a stirrer having rotating arms within said vat, said method comprising the steps of:
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injecting during starting of the stirrer at high volume liquid under pressure along the length and about the periphery of the rotating arms to fluidize the contents of said vat, simultaneously injecting compressed gas along the length of said rotating arms and about the periphery thereof to progressively increase the fluidity of the contents of said vat as a whole from the bottom to the top of said vat, said rotating arms being provided with nozzles and holes, and said method further comprising the steps of after the apparatus is started, reducing the flow of liquid to a low permanent flow by injecting said flow through said nozzles and said holes to prevent any solids from passing therethrough, and increasing the flow of liquid through said nozzles again if the torque reaches a first maximum threshold. - View Dependent Claims (10, 11)
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Specification