Displacement metering with independent ancillary flow
First Claim
1. Displacement metering apparatus with two independently metered flows, especially adapted for use with a particle sensing instrument, comprising:
- first, second and third fluid chambers;
coaxially aligned orifices in communicating series relationship comprising a first orifice connecting said first and second chambers and a second orifice connecting said second and third chambers;
means for effecting and metering filamentary flow from said first chamber seriatim through said orifices into said third chamber;
means for concurrently effecting and metering flow from said second chamber in sheathing laminar relation to said filamentary fluid flow and through said second orifice into said third chamber,said means for effecting filamentary flow comprising a first tube connecting a communication with said third chamber and a first piston slidably mounted in said first tube;
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Abstract
Displacement metering with two independently metered fluid flows comprises displacing fluid in laminar filament flow from a first chamber through a second chamber into a third chamber, the chambers being separated by a pair of spaced walls provided with coaxially aligned orifices in communicating series relationship. Flow in filamentary form is effected from the first chamber through the orifices seriatim into the third chamber, and flow is effected from the second chamber through the second orifice into the third chamber in sheathing relation to the filamentary flow. Differential pressure effects the flow from first to third chamber independently but concurrently with positive displacement effecting flow from the second chamber into the third chamber.
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Citations
24 Claims
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1. Displacement metering apparatus with two independently metered flows, especially adapted for use with a particle sensing instrument, comprising:
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first, second and third fluid chambers; coaxially aligned orifices in communicating series relationship comprising a first orifice connecting said first and second chambers and a second orifice connecting said second and third chambers; means for effecting and metering filamentary flow from said first chamber seriatim through said orifices into said third chamber; means for concurrently effecting and metering flow from said second chamber in sheathing laminar relation to said filamentary fluid flow and through said second orifice into said third chamber, said means for effecting filamentary flow comprising a first tube connecting a communication with said third chamber and a first piston slidably mounted in said first tube;
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2. said means for effecting a sheathing flow comprising a second tube connecting a communication with said second chamber and a second piston slidably mounted in said second tube;
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electric motor means connected to and concurrently operating said first and second pistons, said electric motor means comprising an electric motor, and including a motor control connected to said electric motor, said motor control comprising first means for energizing said electric motor to operate at a desired speed, second means for sensing a predetermined number of revolutions of said motor and generating a start signal for the particle sensing apparatus, third means for sensing a second predetermined number of revolutions after the start signal to generate a stop signal for the particle sensing apparatus, and fourth means connected to said first means for comparing actual motor speed with respect to the desired speed and causing said first means to adjust the energization of the motor. - View Dependent Claims (4, 5, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18, 19, 20, 21, 22, 23, 24)
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3. Displacement metering apparatus with two independently metered flows, especially adapted for use with a particle sensing instrument, comprising:
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first, second and third fluid chambers; coaxially aligned orifices in communicating series relationship comprising a first orifice connecting said first and second chambers and a second orifice connecting said second and third chambers; means for effecting and metering filamentary flow from said first chamber seriatim through said orifices into said third chamber; means for concurrently effecting and metering flow from said second chamber in sheathing laminar relation to said filamentary fluid flow and through said second orifice into said third chamber, said means for effecting filamentary flow comprising a first tube connecting a communication with said third chamber and a first piston slidably mounted in said first tube, said means for effecting a sheathing flow comprising a second tube connecting a communication with said second chamber and a second piston slidably mounted in said second tube; and electric motor means connected to and concurrently operating said first and second pistons, said first and second tubes including frangible material, and comprising pressure sensing means in one of said tubes for sensing the pressure therein, and shut off means connected to said pressure sensing means for causing deenergization of said electric motor means in response to a pressure greater than a predetermined limit.
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6. In particle analysis apparatus of the type in which first, second and third fluid chambers are connected in fluid communication via interposed first and second orifices, and in which a filamentary first fluid flow is effected from the first chamber through the second chamber and into the third chamber, and a second fluid flow is effected from the second chamber into the third chamber in a sheathing laminar relation to the first flow to establish a total flow which is the sum of the first and second fluid flows, the improvement therein comprising:
flow control means for simultaneously and independently metering two of the three specified fluid flows so that each of said first and second fluid flows is a fixed fraction of said third fluid flow.
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17. In a method of analyzing particles in which a filamentary fluid flow is effected from a first chamber through a first orifice, a second chamber and a second orifice into a third chamber, and a second fuid flow is effected from the second chamber through the second orifice into the third chamber in a sheathing laminar relation to the first flow to establish a total flow which is the sum of the first and second fluid flows, the improvement therein comprising:
simultaneously and independently metering two of the three specified fluid flows so that each of the first and second fluid flows is a fixed fraction of the third fluid flow.
Specification