Liquid purification or separation – Flow – fluid pressure or material level – responsive – Filter cleaning
Patent
1998-02-03
2000-03-07
Walker, W. L.
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Filter cleaning
210107, 210354, 210408, 210411, B01D 2964, B01D 2966, B01D 2970
Patent
active
060335580
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a filter device to be placed in a fluid inlet or a fluid conduit to remove dust and foreign matters contained in a fluid conducted through the fluid conduit. More particularly, the present invention relates to a self-gush-cleaning filter device provided with a filter screen and having a function to remove rationally dust and foreign matters deposited on the filter screen.
In this specification, the term, "fluid" is used as a general term signifying a liquid or a gas, and the term "foreign matters" is used as a general term signifying matters such as gravel, algae, slurries, grains or fragments of a substance when the fluid represents a liquid or signifying matters such as dust particles, particulate maters or fragments of a substance when the fluid represents a gas.
BACKGROUND ART
Prevalently used conventional filter devices are classified by filtering means into those of a screen type provided with, for example, a metal screen, a perforated panel or a slit panel, those of a cyclone type and those of a centrifugal separation type, and are classified by cleaning system into those of a shaking system, those of a scraping system and those of a backwash system.
The most serious problem in the conventional filter devices is a method of discharging foreign matters deposited on the screen to prevent the clogging of the screen with foreign matters. Although various filter devices of a shaking system, a scraping system and a backwash system have been proposed, those prior art filter devices need a discharge means of a large scale greater than that of their screening devices and require a high manufacturing cost, and the cleaning systems of those prior art filter devices are short of a perfect cleaning means.
It is an object of the present invention to provide a high-performance, economically advantageous filter device of a simple, rational construction, capable of drastically solving technical problems residing in the prior art, easy to design and manufacture, capable of easily removing foreign matters deposited on a screen and discharging the foreign matters removed from the screen by either manual operation or automatic operation using actuators, and capable of being constructed in a large scale without entailing any problem.
DISCLOSURE OF THE INVENTION
With the foregoing object in view, the present invention provides a self-gush-cleaning filter device comprising, as principal components, a filter casing provided with an inlet passage and an outlet passage, a screen disposed within the filter casing so as to slide along the inner surface of the filter casing in the flowing direction of a fluid, a foreign matter ejecting opening formed between the screen and the inlet passage, a drive shaft for driving the screen, a screen driving unit for driving the drive shaft so as to move the screen quickly in a downstream direction in which the fluid flows from the inlet passage toward the outlet passage and to move the same slowly in an upstream direction opposite the downstream direction, and an outlet shutoff valve disposed in the outlet passage of the filter casing.
When removing foreign matters deposited on the screen from this self-gush-cleaning filter device of the present invention, the outlet shutoff valve is closed to disconnect the screen from a downstream passage to form a closed chamber filled up with the fluid between the screen and the outlet shutoff valve. Then, the screen driving unit is actuated to move the screen slowly in the upstream direction and to move the screen quickly in the downstream direction. The fluid flows through the screen into the closed chamber from the upstream side of the screen toward the downstream side of the same while the screen is being moved gradually in the upstream direction. When the screen is moved quickly in the downstream direction, the fluid contained in the closed chamber gushes suddenly from the downstream side of the screen through the screen into the upstream side of the same, so that foreign matters deposited on
REFERENCES:
patent: 1340599 (1920-05-01), Clarke
patent: 2024753 (1935-12-01), Zwicky
patent: 3767049 (1973-10-01), Worlidge
patent: 5364539 (1994-11-01), Castagno et al.
patent: 5642752 (1997-07-01), Yokota et al.
patent: 5713556 (1998-02-01), Yokota et al.
patent: 5735308 (1998-04-01), Yokota et al.
Hiroshi Yokota
Kabushiki Kaisha Yokota Seisakusho
Schwartz Als
Walker W. L.
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