Patent Application
20170343017
The invention is in the field of jetter cleaning of containers.
Water jetters are used to clean containers, such as sewer pipes, tanks, and ponds. Powerful triplex pumps are used in such applications to create jets of cleaning water, but triplex pumps are sensitive to debris intake and must normally be located outside of the container. For example, use of triplex pumps in sewer cleaning requires use of expensive clean water, such as potable hydrant water. Thus, present sewer cleaning often wastes much potable water.
The instant invention solves a long-existing need for a water jetter for use within containers, having submersible capability, using debris-laden waste water to jet, and generating pressure equal to or greater than that of triplex pumps. Its use of waste water instead of potable water saves money, preserves an important natural resource, and is friendly to the environment.
The invention employs a submersible pump to jet water through a nozzle. Venturi air or pressurized air may be used to enhance the pressure of the jetted water.
Referring to the Figures, a jetter assembly 1 comprises a removable skid cage 3, a hydraulic motor 5, a submersible centrifugal pump 7, and a nozzle assembly 9. The hydraulic motor 5 is driven by hydraulic fluid, received through hydraulic fluid intake 6, from a hydraulic pump (not shown). The hydraulic motor, in turn, rotates an impeller (not shown) within the submersible centrifugal pump 7. When submersed in water, the rotating propeller of the centrifugal pump 7 draws water (not shown), into water intake 11 and into the pump 7, from where it is pumped, at a pressure such as 300 psi and at a volume such as 2000 gpm, through water conduits 13 into nozzle assembly 9 and out nozzles 23.
Air at ambient pressure may be drawn into water conduits 13 via air intakes 15 and air conduits 17. The air enters the water conduits 13 at injection points 21. Injection tubes 19 within water conduits 13 are a continuation of air conduits 17. At ambient air pressure, the air is drawn into the conduits 13 by the Venturi effect, as pumped water flows through the water conduits 13.
Air also may be pressurized to a pressure greater than the water pressure created by the pump 7, such as 2000 psi. The pressurized air may be injected into air intake 15 by a pressurized air supply (not shown) through air conduits 17 and injection tubes 19. The pressurized air is released into water conduits 13 through air tubes 19 that enter water conduits 13 at injection points 21.
The injection of air into water conduits 13 substantially increases the pressure of the water as it flows past the air tubes 19. Ambient pressure air is suitable, but higher air pressure increases still further the pressure of the water. The pressure-enhanced water is further driven into nozzle assembly 9, from where the pressure-enhanced water, mixed with the air, is ejected through nozzles 23.
The vertical angle of attack of the nozzle assembly 9 may be adjusted by lifting or lowering the nozzle assembly 9 by generally rotating the assembly within the skid cage 3 about an axis proximal the water intake 11. A range of adjustment is generally indicated by arrows 25.
To use the jetter assembly 1 in the cleaning of a sewer pipe containing flowing waste water, the assembly 1 is connected by hose to a surface supply of pressurized hydraulic fluid and lowered into a manhole. A second hose with ambient or pressurized air may be added. The assembly 1 is oriented with the nozzles downstream the flow of water in the sewer pipe. The jetter assembly 1 is then activated by the hydraulic fluid, driving the centrifuge pump 7. Sewer water entering the water intake 11 is ejected from nozzles 23, driving the jetter assembly 1 a suitable distance upstream from the force of the ejected water. Venturi or pressurized air may be injected to increase the ejected water pressure. Upon reaching the suitable distance, the activated jetter assembly is slowly retracted through the pipe toward the manhole by the pressurized air hose, pressurized hydraulic fluid hose, or other tether between the jetter assembly 1 and the surface above the manhole. As the jetter assembly 1 is retracted, water ejected by nozzles 23 lifts and pushes solids in the sewer pipe downstream and toward the manhole, creating a slurry that can be removed by a submersible pump located in the pipe at approximately the manhole, such as reflected in U.S. Pat. No. 5,336,333.
In sewer pipe and other applications in which the water drawn into the water intake 11 may contain significant, large solids, a screen (not shown) may be placed over water intake 11 to minimize solids intake. Also, solids accumulating in nozzle assembly 9 may be removed by removing the cap 27 of clean-out port 29 and cleaning within the nozzle assembly 9.
“Containers” means any container that may be accessed, including without limitation pipes, tanks, and ponds. With the benefit of this disclosure, one of ordinary skill will understand that the air injection may be configured in a variety of ways, including structure and location variations, suitable for enhancing the pressure of water pressurized by a submersible pump. “Submersible pump” means any pump that operates submerged in water, including without limitation impeller pumps and disk pumps. “Nozzle” means any passageway configured to clean the inside of a container with jetted water.
With the benefit of this disclosure, one of ordinary skill will appreciate that many embodiments of the invention may be employed within the scope of the claims for a variety of applications.
This application is a continuation of U.S. patent application Ser. No. 12/478,547, filed on Jun. 4, 2009, entitled “Submersible Pump Water Jetter,” which is hereby incorporated by reference.
| Number | Date | Country | |
|---|---|---|---|
| Parent | 12478547 | Jun 2009 | US |
| Child | 15635534 | US |
