Liquid purification or separation – Filter – With residue removing means or agitation of liquid
Patent
1987-08-11
1989-07-18
Lacey, David L.
Liquid purification or separation
Filter
With residue removing means or agitation of liquid
210411, 210412, 210413, 210415, 2104973, 210772, 209250, 209273, 209281, 209380, B07B 106
Patent
active
048491055
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an apparatus for removing solid particles from the cooling water for power plants and the like. It has a tubular housing and, attached to its interior, a funnel-shaped trap sieve, the pointed end of which extends in the flow direction. A pressurized water sprayer includes a washer arm concentrically rotatable about the downstream side of the sieve. The arm has at least one discharge nozzle facing the downstream side of the sieve. Further, a suction tube extends into a collecting chamber of the sieve.
Large quantities of water are required to cool heat exchangers in steam-operated and other types of power plants. The cooling water must be cleaned regularly to prevent solid particles therein, such as wood, plastic, leaves, blades of grass, shells and the like from clogging and damaging parts of the plant. The larger particles are removed by means of rakes. However, the finer particles are typically removed with trap sieves by suctioning them off the upstream side of the sieve. To dislodge and remove particles which adhere to and clog trap sieve perforations, the prior art employs suction arms as is disclosed, for a cylindrical trap sieve, in U.S. Pat. No. 2,275,958, and for a funnel-shaped sieve, in German Utility Model No. DE-GM 83 37 300. Such arms have suction slots which rotate proximate the upstream side of the trap sieve. These constructions have proven disadvantageous because larger particles, e.g. wood, shells, etc. frequently jam the suction arm as it rotates about the upstream side of the trap sieve, thus rendering the arm, or the arm together with the trap sieve inoperable. This distinct disadvantage is also encountered with a commercially well-known apparatus, which has, in addition to a suction arm rotatable about the upstream side, a washer arm at the downstream side of the sieve positioned opposite the suction arm and rotating therewith. In this construction pressurized water is sprayed through nozzle slits against the downstream side of the sieve to clean the sieve perforations. Moreover, a construction incorporating both a suction arm rotating about the upstream side of the sieve and a washer arm rotating about the downstream side is very costly.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide an apparatus of the above mentioned kind in which jamming of the suction apparatus on the upstream side of the trap sieve is eliminated.
This is achieved in accordance with the present invention by constructing the pointed end of the sieve as a cylindrical container having a water impervious end and extending the intake of a suction tube into the container.
A distinct advantage of the present invention is the absence of any rotating components on the upstream side of the trap sieve which might become jammed by large particles, which could result in serious damage. Only a stationary suction tube is located on the upstream side of the sieve while a rotatable washer arm is located on the downstream side. Since large particles cannot penetrate the trap sieve, they cannot damage the rotatable arm. Heretofore, it was assumed that an effective suctioning of dirt particles can only be achieved by positioning the suction tube as close as possible to the upstream surface of the sieve and rotating it with the washer arm on the downstream side to loosen particles adhering to the sieve and wash them directly into the suction tube intake.
Applicant has discovered, however, that by properly constructing the pointed sieve end and properly positioning a stationary suction tube, at least equivalent results are obtained. Such a device is simpler to construct and does not involve the risk of particles jamming or clogging movable components.
When cleaning the sieve at prescribed intervals in accordance with the degree of particle accumulation, the washer arm is rotated proximate the downstream or outer surface of the trap sieve, preferably pulsating pressurized wash water against the downstream surface. Wash water penetrates the
REFERENCES:
patent: 4130478 (1978-12-01), Swallow
Dang Thi
GEA Energiesystemtechnik GmbH & Co.
Lacey David L.
LandOfFree
Apparatus for removing solid particles from cooling water does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for removing solid particles from cooling water, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for removing solid particles from cooling water will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-169771