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An improved blade design and method for enhancing the efficiency of operation of a centrifuge is disclosed based on measuring a varying value of the load on the centrifuge as the flow of contaminated fluid is injected into the centrifuge. The centrifuge has a plurality of blades with radially overla

An improved blade design and method for enhancing the efficiency of operation of a centrifuge is disclosed based on measuring a varying value of the load on the centrifuge as the flow of contaminated fluid is injected into the centrifuge. The centrifuge has a plurality of blades with radially overlapping edges to keep the fluid being centrifuged compartmentalized and thus quiet for maximum efficiency. Additionally, the scraping blade assembly has blades which are angled in the scraping direction to force the solids towards the exit of the centrifuge, whether that be at the bottom or the top. A programmable logic controller monitors the load on the drive motor and compares a baseline value of load after accelerating the rotor to speed to the value of load while the contaminated fluid is injected into the rotor. The varying second value of load, measured during injection of fluid into the assembly, is compared to the baseline value of load to determine flow rate of the fluid being injected into the rotor assembly or to ascertain whether any dysfunction is occurring and to take appropriate steps to correct malfunction.

대표청구항 ▼

1. A single motor centrifuge for separating contaminants from a fluid, comprising:a first shaft configured to rotate about an axis, a bowl attached to the first shaft to rotate therewith, the bowl being configured to receive the fluic containing the contaminants; a second shaft received through a pa

1. A single motor centrifuge for separating contaminants from a fluid, comprising:a first shaft configured to rotate about an axis, a bowl attached to the first shaft to rotate therewith, the bowl being configured to receive the fluic containing the contaminants; a second shaft received through a passageway defined by the first shaft, the second shaft being configured to rotate about the same axis as the first shaft; a plurality of scraper blades attached to the second shaft to rotate therewith, the scraper blades being received in the bowl to selectively remove the contaminants accreted on an interior surface of the bowl; positive lock means for selectively coupling the first shaft and the second shaft to rotate the bowl and the blades in tandem at the same speed during a processing mode and to rotate the bowl alone in a scraping mode; and, a variable frequency drive electrically connected to the single motor, and wherein the single motor is rotatably connected to the first shaft. 2. The apparatus of claim 1, wherein all of the blades are angled to force the contaminants toward a discharge opening for the contaminants in the bowl.3. The apparatus of claim 2, wherein the angle is greater than 5 degrees.4. The centrifuge of claim 1, further including an accelerator, wherein the accelerator fastens the plurality of scraper blades on the second shaft, and a liquid injector below the bowl for injecting the fluid with contaminants upward, the fluid being injected upward during the processing mode, and the fluid impacts upon the accelerator which imparts a first rotational speed to the fluid about the same as the second rotational speed at which the plurality of scraper blades and the bowl are rotating.5. The centrifuge of claim 1, wherein each of the scraper blades has a front face and an end, the end adjacent an interior wall of the bowl, the front face and the end defining a recess therein, the recess receiving a scraping insert, the scraping insert defining a cutting surface configured to plow solids accumulated on the interior wall of the bowl.6. The centrifuge of claim 1, wherein the centrifuge is an inverted bowl automatic self-discharging centrifuge.7. The apparatus of claim 1, wherein at least one of the blades has a forward angle from a top edge to a bottom edge, the forward angle being in a direction from a rear face to a front face.8. The apparatus of claim 7, wherein the forward angle is created by at least one insert located in at least one recess in the blade.9. The apparatus of claim 1, wherein the centrifuge has four scraper blades.10. The apparatus of claim 1, wherein each blade has a width between a first radius and a second radius, and wherein a first portion of a first blade radially overlaps a second portion of a second of the plurality of blades but the radial overlap does not extend over the entire width of either the first or the second blade.11. A single motor centrifuge for separating solids from a liquid, comprising:a bowl attached to a spindle configured to rotate about an axis; a plurality of scraper blades attached to a drive shaft, wherein the scraper blades are positioned to rotate in the bowl on the same axis as the spindle, and wherein the drive shaft is received in a passageway defined by the spindle; and, a variable frequency drive electrically connected to a single motor, the motor selectively rotatably connected to the spindle and the drive shaft by a positive lock means for selectively coupling the spindle and the drive shaft to rotate the bowl and the scraper blades in tandem at the same speed in a first mode and to rotate the bowl alone to produce relative motion between the bowl and the scraper blades in a second scraping mode. 12. The apparatus of claim 11, wherein all of the blades are angled to force the solids toward a discharge opening for the solids in the bowl.13. The apparatus of claim 12, wherein the angle is greater than 5 degrees.14. The centrifuge of claim 11, further including an accelerator, wherein the accelerator fastens the plurality of scraper blades on the drive shaft, and a liquid injector below the bowl for injecting the liquid with solids upward, the liquid being injected upward during the first mode, and the liquid impacts upon the accelerator which imparts a first rotational speed to the liquid about the same as the second rotational speed at which the plurality of scraper blades and the bowl are rotating.15. The centrifuge of claim 11, wherein each of the scraper blades has a front face and an end, the end adjacent an interior wall of the bowl, the front face and the end defining a recess therein, the recess receiving a scraping insert, the scraping insert defining a cutting surface configured to plow solids accumulated on the interior wall of the bowl.16. The centrifuge of clam 11, wherein the centrifuge is an inverted bowl automatic self-discharging centrifuge.17. The apparatus of claim 11, wherein at least one of the blades has a forward angle from a top edge to a bottom edge, the forward angle being in a direction from a rear face to a front face.18. The apparatus of claim 17, wherein the forward angle is created by at least one insert located in at least one recess in the blade.19. The apparatus of claim 11, wherein the centrifuge has four scraper blades.20. The apparatus of claim 11, wherein each blade has a width between a first radius and a second radius, and wherein a first portion of a first blade radially overlaps a second portion of a second of the plurality of blades but the radial overlap does not extend over the entire width of either the first or the second blade.