Abstrict
A filter cloth washing device for a filter press, wherein wash
water is sprayed on filter cloths trained about rollers positioned
below the filter plates. In the device, wash water supply pipes
having a plurality of spraying nozzles run parallel to the rollers,
and have coupling means on at least one of their ends. Each coupling
means has an inner diameter larger than the inner diameter of its
respective water supply pipe, first and second communication ports
and flexible pressure hoses for connecting neighboring coupling
means to each other. The connection between neighboring coupling
means is such that the first communication port of one coupling
means is connected by a flexible pressure hose to the first communication
port in another coupling means upstream and its second communication
port is connected by another flexible pressure hose to the second
communication port of yet another coupling means downstream. If
the number of filter plates is increased, the water for washing
the increased number of filter cloths may be supplied easily and
positively by additional pressure hoses of the same length and type.
Claims
What is claimed is:
1. In a filter cloth washing device for a filter press, wherein
washing water is sprayed on filter cloths respectively trained about
lower rollers positioned below the bottom end of respective filter
plates and adapted to travel thereabout, thereby washing respective
filter cloths, the improvements comprising
a plurality of washing water supply pipes respectively having a
plurality of spraying nozzles and running in parallel to said respective
lower rollers;
a plurality of coupling means connected to at least one end of
each of said water supply pipes, respectively, each of said coupling
means having an inner diameter larger than an inner diameter of
its respective water supply pipe, and first and second communication
ports; and
a plurality of flexible pressure hoses for connecting the neighboring
coupling means to each other, wherein a metallic joint is provided
to connect two flexible pressure pipes for interconnecting the neighboring
coupling means;
the connection among the neighboring coupling means being such
that the first communication port in one coupling means attached
to one filter plate is connected by way of one flexible pressure
hose through the metallic joint to a first communication port in
another coupling means attached to another filter plate upstream
of said one filter plate, and the second communication port in said
one coupling means is connected by way of another flexible pressure
hose through another metallic joint to a second communication port
in another coupling means attached to another filter plate downstream
of said one filter plate.
2. The improvements as defined in claim 1, wherein the metallic
joint is a U-shaped pipe.
Description BACKGROUND OF THE INVENTION
This invention relates to a filter cloth washing device for a filter
press, wherein each filter cloth provided for every filter plate
travels individually and is washed by a washing device attached
to that filter plate.
Hitherto, it has been usual that filter cloths clogged due to cyclical
dehydrating operations are washed by spraying pressurized water
thereon.
A well-known filter cloth washing device for a travelling filter
cloth type filter press, in which each filter cloth provided for
every filter plate is adapted to travel individually, is so arranged
that, as shown in FIG. 1, a plurality of washing water pipes 2,
having a plurality of water spraying nozzles, and substantially
equal in length to a width of a filter cloth run below respective
filter plates 1, 1' ... in parallel relation thereto a washing water
header pipe 5 runs between a front fixed frame 3 and a rear fixed
frame 4 of the filter press, which water header pipe is long enough
to cover the distance between these fixed frames 3 and 4. The washing
water header pipe 5 and respective water pipes 2 running below filter
plates 1, 1' ... are connected to each other by means of pressurized
rubber hoses 6.
In discharging cakes or washing the filter cloths, this prior art
device has the following disadvantages. That is to say, all of filter
plates 1, 1' ... must be shifted open simultaneously, and therefore
distances of shift of the filter plates which are located at the
side close to the movable frame 7 are much larger than that of the
filter plates which are located at the side close to fixed frame
3. For this reason, with such a washing device, pressure rubber
hoses 6 connecting water pipes 2 below respective filter plates
1, 1' ... with washing water header pipe 5 must be increased in
length towards the filter plate located on the side of the movable
frame 7. A shortcoming is thus encountered with the existing filter
press having a large number of filter plates in that a number of
long, washing, pressure rubber hoses 6 project in a bent state to
the lower portion of the side wall of the filter press, and these
hoses are likely to entangle one another in the portion close to
the filter plates, thus greatly reducing the peripheral maintenance
space of the filter press.
SUMMARY OF THE INVENTION
It is accordingly an object of the present invention to provide
a filter cloth washing device for a filter press, wherein regardless
of the increase in number of filter plates, water for washing the
increased number of filter cloths may be supplied by increasing
the number of pressure rubber hoses, each of which is the same in
length and type, without the need for preparing pressure rubber
hoses which are different in length and type, thereby providing
an increased, effective maintenance space in the area close to the
filter press.
To attain this object, there is provided according to the present
invention a filter cloth washing device for a filter press, which
comprises; a plurality of washing water supply pipes, at least one
such pipe for every filter plate, each pipe having a plurality of
spraying nozzles 11 and running in parallel to the lower filter
cloth rollers for said plate; a plurality of coupling means, one
for each said pipe and connected to at least one end of thereof
each coupling means having the inner diameter larger than an inner
diameter of its respective water supply pipe, and first and second
communication ports in each of said coupling means. As assembled,
the first communication port in one coupling means attached to one
filter plate is connected by a flexible pressure hose to the first
communication port in another coupling means attached to the other
filter plate upstream of said one filter plate, and its second communication
port is connected by another flexible pressure hose to the second
communication port in yet another coupling means attached to yet
another filter plate downstream.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic side view of a prior art filter cloth washing
device for a travelling filter cloth type filter press;
FIG. 2 is a schematic side view of a filter cloth washing device
for a filter press, according to the present invention; and
FIG. 3 is a fragmentary perspective view of the device in FIG.
2.
DESCRIPTION OF PREFERRED EMBODIMENT
Referring to FIGS. 2 and 3 which are illustrative of the arrangements
of the present invention, there is provided a plurality of washing
water supply pipes 12 each having a water-spraying nozzle 11 for
spraying water to respective filter cloths 10 trained about filter
plates 8 and lower rollers 9 provided below the bottom end of respective
filter plates 8. Each water supply pipe 12 runs below its respective
lower roller 9 in parallel thereto, with its spraying nozzles 11
directed in opposing relation to the surfaces of respective filter
cloths 10, and is fixedly retained below the filter plates 8 by
its respective coupling means 13. Coupling means 13, by which the
water supply pipe is fixedly retained at one end thereof, has a
bore 14 having an inner diameter D larger than an inner diameter
d of water supply pipe 12 connected thereto, and bore 14 is communicated
with the corresponding water supply pipe 12. Coupling means 13 has
a first (or inner) communication port 15a and a second (or outer)
communication port 15b, both of which are opened to bore 14.
First communication port 15a in one coupling means 13 attached
to one filter plate 8 is connected by way of a flexible pressure
hose 16 to a first communication port 15c in another coupling means
13 attached to another filter plate 8 upstream of the aforesaid
one filter plate 8, and second communication port 15b in the aforesaid
one coupling means 13 is connected by way of the another flexible
pressure hose 16 to a second communication port 15d in yet another
coupling means 13 attached to yet another filter plate 8 downstream
of the aforesaid one filter plate.
First communication ports 15a (or second communication port 15b)
in one coupling means 13 may be connected to either first communication
port 15c or second communication port 15d in another coupling means
13, a long as the result of the connections is one downstream and
one upstream of the said one coupling means. It is, however, preferable
that, the inner communication port in one coupling means as viewed
in the longitudinal axis thereof is connected to the inner communication
port in the neighboring coupling means, and the outer communication
port in the former to the outer communication port in the latter,
respectively, so that respective flexible pressure hose 16 remain
untwisted when filter plates 8 are shifted between an open position
and a closed position.
While the connection between neighboring coupling means 13 and
13 is accomplished by flexible pressure hose 16 alone as described
above, the use of a metallic joint 17 is preferable, which joint
17 is resistant to breaking or cracking even when the filter plates
are brought into a close position, as a result of which flexible
pressure hoses 16 are prevented from being bent and cracked when
the filter plates are brought into a close position. It is more
preferable that, instead of the joint 17, a U-shaped pipe be used
for interconnecting the neighboring coupling means.
Each water supply pipe 12 may be disposed between the bottom end
of filter plate 8 and lower roller 9 in a manner to spray pressurized
water to each filter cloth 10 from inside thereof, rather than disposed
below the lower roller 9. Further, while coupling means 13 of neighboring
filter plates 8 are connected to each other by means of flexible
pressure hoses 16 in the embodiment shown, the plurality of coupling
means may alternatively be connected to every other plate. Coupling
means 13 is not limited to the configuration shown, but may be of
other configurations, such as a Y-shape or T-shape.
One communication port in coupling means 13 attached to the filter
plate 8 adjacent to a fixed frame 18 of the filter press is connected
to a supply pipe 19 rigidly secured to fixed frame 18. Likewise,
one communication port in coupling means 13 attached to filter plate
8 adjacent to a movable frame 20 is sealingly closed with a plug
(not shown).
After the filter plates have been shifted to an open position and
cake has been removed from respective filter cloths 10, if pressurized
water is fed to supply pipe 19, then the washing water will be distributed
by way of flexible pressure hoses 16 to water supply pipes 12, and
from spraying nozzles 11 to the surface of respective filter cloths
10, to thereby wash the filter cloth. At this juncture, each filter
cloth 10 trained about the lower roller 9 is caused to travel therealong,
so that respective filter cloths 10 are washed over their entire
filtering surface uniformly.
With the filter cloth washing device according to the present invention,
even in the event of the number of filter plates being increased,
the water for washing the increased number of filter cloths may
be supplied easily and positively by increasing the number of pressure
hoses. Since these hoses are of the same in length and type, there
is no need to prepare a variety of pressure hoses differing in length
and type as in the prior art device. This advantage results in the
present invention being compact and affords a larger maintenance
space in the side portion of the filter press. The present invention
is easily adaptable for existing filter presses with less cost,
and so, is practical for industrial purposes.
What has been described should be considered as explaining the
principle of the invention. Various changes and modifications may
be made by those skilled in the art without departing the spirit
and scope of the invention and appended claims.
|