Filtering apparatus and open/close valve for the filtering...

Details Filtering apparatus and open/close valve for the filtering... Filtering apparatus and open/close valve for the filtering...

2001-01-09

2002-05-07

Lithgow, Thomas M. (Department: 1724)

Liquid purification or separation

With precoat adding or applying means

C210S136000, C210S777000, C210S205000, C210S416100, C137S546000, C137S883000

Reexamination Certificate

active

06383377

ABSTRACT:

This invention is based on Patent Application Nos. 2000-30154 Pat. and 2000-383221 Pat. filed in Japan, the contents of which are hereby incorporated by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a filtering apparatus, especially a filtering apparatus including a filtering vessel, wherein a precoat filtering layer is formed with a filter aid on a filtering bed between a nonfiltered liquid chamber, into which a nonfiltered liquid to be filtered is introduced, and a filtered liquid chamber, so that the nonfiltered liquid introduced into the nonfiltered liquid chamber is filtered while moved through the precoat filtering layer to the filtered liquid chamber to be let out of the filtered liquid chamber.
The present invention also relates to an open/close valve for the filtering apparatus.
2. Description of the Background Art
Various processing liquids, such as a plating liquid, a dying liquid, a liquid photo developer and an ordinary cleaning liquid, are widely filtered for reuse with a filtering apparatus that includes a pump and a filtering vessel.
This is because of increases in impurities, as the liquids are repeatedly used, like impurities carried in with an article which is to be processed, impurities generated due to a change in quality like deterioration of the processing liquids and/or external impurities to fall into the liquids.
Liquid refining and filtering are also widely adopted for those such as liquid industrial chemicals, liquid pharmaceuticals and drinks.
A typical example of the above filtering apparatus is a filtering apparatus including a filtering vessel, wherein a precoat filtering layer is formed with a filter aid (filtering material) on a filtering bed between a nonfiltered liquid chamber, into which a nonfiltered liquid to be filtered is introduced, and a filtered liquid chamber, so that the nonfiltered liquid introduced into the nonfiltered liquid chamber may be filtered while moved through the precoat filtering layer to the filtered liquid chamber to be let out of the filtered liquid chamber.
FIG. 3
is an example of the conventional apparatus. The filtering apparatus in
FIG. 3
is provided with a filtering vessel
8
. The filtering vessel
8
includes a nonfiltered liquid chamber
83
where a nonfiltered liquid L is introduced to be filtered, a filtered liquid chamber
84
and a filtering bed
81
therebetween where a precoat filtering layer
82
is formed with a filter aid (filtering material), so that the nonfiltered liquid L, introduced, while pressurized, through a nonfiltered liquid inlet port
831
at a bottom of the nonfiltered liquid chamber
83
, is filtered, while moved through the precoat filtering layer
82
to the filtered liquid chamber
84
, and a filtered liquid L′ is let out through a filtered liquid outlet port
841
at a bottom of the filtered liquid chamber
84
.
In addition to the filtering vessel
8
, the filtering apparatus
8
in FIG.
3
includes the following:
1) a nonfiltered liquid introduction pipe line
1
for introducing the nonfiltered liquid L to be filtered into the nonfiltered liquid chamber
83
through the nonfiltered liquid inlet port
831
of the nonfiltered liquid chamber, which includes a pump P, a first open/close valve (openable and closable valve) V
1
connected to a suction port of the pump P and a check valve V
7
, located between a pump discharge port of the pump P and the nonfiltered liquid inlet port
831
of the nonfiltered liquid chamber,
2) a filtered liquid outlet pipe line
2
, including a second open/close valve V
2
, for letting out the filtered liquid L′ through the filtered liquid outlet port
841
of the filtered liquid chamber
84
,
3) a bypass pipe line
3
for precoating, from the filtered liquid outlet port
841
of the filtered liquid chamber
84
to the suction port of the pump P via a third open/close valve V
3
,
to be more detailed according to the figured example, a bypass line
3
for precoating, from a liquid flow branch point M
2
, located between the filtered liquid outlet port
841
of the filtering vessel
8
, and the second open/close valve V
2
of the filtered liquid outlet line
2
, to a liquid flow confluence point M
3
, located between the pump suction port and the first open/close valve V
1
of the nonfiltered liquid introduction line
1
, via the third open/close valve V
3
, and
4) a filter aid introducing pipe line
5
, from a prearranged precoating liquid outlet port
85
(for example, a precoating liquid outlet port arranged at the nonfiltered liquid chamber
83
, or, according to the figured example, a precoating liquid outlet port prearranged on an uppermost portion of the nonfiltered liquid chamber
83
) of the filtering vessel
8
, to a liquid flow confluence point M
1
, located between the pump suction port and the first open/close valve V
1
of the nonfiltered liquid introduction line
1
.
The introducing line
5
is, though not limited to this, according to the figured example, a line from the precoating liquid outlet port
85
to the suction port of the pump P, via a fifth open/close valve V
5
, a filter aid addition part t and a sixth open/close valve V
6
. The filter aid (filtering material) addition part t according to the figured example is formed in a shape of a tank with an opening, for addition of the filter aid or the like, provided on an uppermost portion. A lowermost end
511
of a pipe line
51
, from the precoating liquid outlet port
85
of the filtering vessel
8
to the filter aid addition part t via the fifth open/close valve V
5
, is inserted and opened into the tank t. A liquid outlet port at a bottom of the tank t is connected to the liquid flow confluence point M
1
, located just before the suction port of the pump, with a pipe
52
having the sixth open/close valve V
6
therebetween.
PG in the figure is a pressure gauge to measure a pressure in the filtering vessel
8
.
When the filtering apparatus is in normal liquid filtering operation, only the valves V
1
and V
2
are opened with all the other open/close valves closed out of a plural number of open/close valves. Under the condition, the pump P is put in operation. The nonfiltered liquid L to be filtered is sucked into the pump P through the valve V
1
and is discharged from the pump P to flow into the nonfiltered liquid chamber
83
through the check valve V
7
. The nonfiltered liquid L in the nonfiltered liquid chamber
83
flows into the filtered liquid chamber
84
under a discharging pressure of the pump through the precoat filtering layer
82
formed beforehand with the filter aid. At this time, the nonfiltered liquid is filtered. The filtered liquid L′ flows to a predetermined location (not shown) out of the filtered liquid outlet port
841
of the filtered liquid chamber
84
and through the open/close valve V
2
.
The liquid in the filtering vessel
8
starts to flow back to the pump P when filtering operation is ended with stoppage of the pump P or when the pump is stopped due to an electric power outage. The flow, however, is stopped by the check valve V
7
, so that the liquid in the filtering vessel
8
stays in the vessel.
The precoat filtering layer
82
is formed, for example, in such a manner as follows:
The open/close valve V
2
of the filtered liquid outlet line
2
, the open/close valve V
3
of the bypass line
3
for precoating and the sixth open/close valve V
6
of the line
5
are closed, when the filtering vessel
8
is free from any liquid inside as immediately after installation of the filtering apparatus, or is cleaned and free from any liquid. On the other hand, the open/close valve V
1
of the nonfiltered liquid introduction line
1
and the fifth open/close valve V
5
of the line
5
are opened. Under this condition, the pump P is started, when prime water W is introduced into the filter aid addition tank t and the valve V
6
is opened.
The pump P, while sucking the prime water W, begins to suck the nonfiltered liquid L. The nonfiltered liquid is thus introduced into the filtering vessel

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