U.S. patent number 3,808,631 [Application Number 05/230,948] was granted by the patent office on 1974-05-07 for device for removing a sludge from a surface.
This patent grant is currently assigned to Mitsubishi Jukogyo Kabushiki Kaisha. Invention is credited to Setsuo Kondo, Iwao Sakamoto, Yajuro Seika, Katsuhiko Shibata, Kango Yamada.
United States Patent |
3,808,631 |
Shibata , et al. |
May 7, 1974 |
DEVICE FOR REMOVING A SLUDGE FROM A SURFACE
Abstract
A device for removing a sludge from the surface of a liquid or
from a floor such as a deck of a tanker includes a shovel which is
adapted to be moved along the sludge with its opened mouth
positioned to receive the sludge. The construction includes a
connection for directing a high velocity liquid jet into the shovel
in the vicinity of the mouth to impinge upon the sludge and to
break it up into a slurry and, in addition, means are provided for
withdrawing the slurry upwardly through a conduit for discharge at
a remote location. The discharging connection advantageously
includes a liquid ejector which is operated partly by the conduit
connected for supplying the high velocity jet of liquid to the
shovel and which is connected to the shovel for providing a
withdrawing suction or pumping action on the slurry which is formed
in the shovel. In a further embodiment, the interior of the shovel
is provided with a screen or grate across the shovel interior onto
which the slurry is directed and against which the high velocity
liquid jet is directed. The action breaks up the slurry elements
into finer elements for withdrawal through the discharge conduit. A
still further embodiment includes an intermediate chamber at the
rear of the shovel which is adapted to receive the slurry after it
is first acted upon by the high velocity jet and which includes a
plurality of turning water streams which are directed in a whirling
flow to cause a rotation and further pulverizing of the slurry
material before it is delivered through the discharge conduit.
Inventors: |
Shibata; Katsuhiko
(Nishisonogi-gun, JA), Seika; Yajuro
(Nishisonogi-gun, JA), Sakamoto; Iwao (Nagasaki,
JA), Yamada; Kango (Nagasaki, JA), Kondo;
Setsuo (Nagasaki, JA) |
Assignee: |
Mitsubishi Jukogyo Kabushiki
Kaisha (Tokyo, JA)
|
Family
ID: |
26924709 |
Appl.
No.: |
05/230,948 |
Filed: |
March 1, 1972 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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876371 |
Nov 13, 1969 |
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Current U.S.
Class: |
15/321; 15/322;
15/409; 134/175; 15/401 |
Current CPC
Class: |
A47L
11/4088 (20130101); A47L 11/34 (20130101); B08B
9/0933 (20130101); A47L 11/4044 (20130101) |
Current International
Class: |
A47L
11/00 (20060101); A47L 11/34 (20060101); B08B
9/093 (20060101); B08B 9/08 (20060101); A47l
007/00 () |
Field of
Search: |
;15/1.7,321,322,345,346,401,409 ;134/175 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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199,338 |
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Jun 1923 |
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GB |
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172,182 |
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1906 |
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DD |
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58,617 |
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Apr 1941 |
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DK |
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Primary Examiner: Jenkins; Robert W.
Assistant Examiner: Cantor; Alan I.
Attorney, Agent or Firm: McGlew; John J.
Parent Case Text
This is a continuation, of application Ser. No. 876,371 filed Nov.
13, 1969; now abandoned.
Claims
What is claimed is:
1. A device for removing sludge particularly from the bottoms of
oil tanks, comprising a shovel having a head defining an interior
sludge receiving chamber with an opening which is adapted to be
advanced into the sludge material to be removed, said shovel having
an inclined bottom wall terminating in an engagement edge which is
engageable into the sludge and with a wall inside said head
defining an oblique impounding surface and a top wall with a front
downwardly extending edge at the opposite side of the opening
spaced forwardly of said bottom edge, nozzle means at said front
edge including a nozzle oriented rearwardly toward said impounding
surface for directing a high velocity jet of liquid downwardly
against said impounding surface to loosen the sludge ahead of said
bottom wall to permit it to enter into said receiving chamber to
break up the sludge material and form it into a liquid slurry,
discharge conduit means for the discharge of the slurry from said
receiving chamber connected to said receiving chamber at a spaced
location from the opening of said shovel head, and venturi means
connected to said discharge conduit means to provide withdrawal
pressure for moving the slurry through said discharge conduit
means.
2. A device for removing sludge particularly from the bottoms of
oil tanks, comprising a shovel having a head defining an interior
sludge receiving chamber with an opening which is adapted to be
advanced into the sludge material to be removed, said shovel having
an inclined bottom wall terminating in an engagement edge which is
engageable into the sludge and a top wall with a front downwardly
extending edge at the opposite side of the opening spaced forwardly
of said bottom edge, nozzle means at said front edge for directing
a high velocity jet of liquid downwardly at a spaced location ahead
of said bottom edge to loosen the sludge ahead of said bottom wall
to permit it to enter into said receiving chamber to break up the
sludge material and form it into a liquid slurry, discharge conduit
means for the discharge of the slurry from said receiving chamber
connected to said receiving chamber at a spaced location from the
opening of said shovel head, and venturi means connected to said
discharge conduit means to provide withdrawal pressure for moving
the slurry through said discharge conduit means, said head
including a screen extending across the interior thereof and
defining an impounding surface against which the sludge material is
received, said nozzle means including a nozzle directed to
discharge against said screen.
3. A device, according to claim 2, wherein said nozzle means
includes a nozzle mounted on said head, a high pressure liquid
conduit connected to said nozzle, said venturi means including a
conduit at a remote location from said head connected to said high
pressure liquid conduit, a diffuser surrounding one end of said
conduit and being connected intermediate its length to said head at
a location spaced from the opening thereof.
Description
SUMMARY OF THE INVENTION
This invention relates in general to the construction of devices
for removing sludges and in particular, to a new and useful device
for removing accumulated matter such as sludge, sand and other from
petroleum and which accumulate at the bottom of a tank of an oil
tanker.
When an oil tanker enters the dock during a period of overall for
unloading prior to entering into a ship yard the lifting of any
sludge which has accumulated on the bottom of the oil tanker is
effected. Heretofore the sludge is removed by very primitive
methods and by many workers entering the cargo oil tank after it is
cleared of gases. The material is removed by shovels, buckets and
winches driven by an air motor. In recent times the size of such
tankers has become extrodinarily large and the bottom area of a
tank and the depth of a tank have been increased and therefore many
workers and working hours have come to be spent for the operation
of removing sludges from tanks of such large vessels. In addition,
because of the shortage of personnel, development of more efficient
methods of sludge removal is very desirable.
In accordance with the present invention there is employed a shovel
or scope member having an opening at one end which may be oriented
toward the sludge material to be removed and which includes means
for directing a high pressure liquid jet against the surface of the
sludge as it is being scoped up by movement of the slurry into the
sludge material. The jet causes the ellapse of the sludge material
and forms it into a slurry. The shovel itself is associated at its
other end with a discharge conduit which is put under negative
pressure preferably by an ejector which is actuated partly by a
branch of the high velocity jet stream of liquid. In one embodiment
the shovel is advantageously provided with a screen across its
interior in order to provide an impounding surface for the sludge
against which the high velocity jet is directed to ensure that the
sludge is broken up into small particles. In a further embodiment
the shovel includes an after chamber into which the slurry is
directed after first being acted upon by the high velocity jet. In
the after chamber means are provided to direct liquid tangentially
against the slurry and whirl it so as to ensure that it is
pulverized into smaller particles before it is delivered through
the discharge of the shovel.
Accordingly, it is an object of the invention to provide an
improved device for removing slurries from the floor of a tank or
the surface of a liquid and which includes a shovel or scope having
an opened end which may be oriented toward the slurry and which
includes means for directing a high velocity jet against the slurry
which is picked up by the shovel, and wherein the shovel includes
means for removing the picked up slurries through a discharge.
A further object of the invention is to provide a slurry removal
shovel which includes a shovel head having an opening which is
adapted to be positioned to scope up the sludge material and which
also includes means for directing a high velocity jet against the
sludge material to form it into a slurry and preferably to direct
it against stream means for ensuring its being broken up into small
pieces and which further includes means for turning the slurry in a
water stream to provide a further comunuting of the materials, the
construction including an ejector which is worked by a high
velocity liquid to provide a negative pressure in the shovel for
facilitating the discharge of the slurry.
A further object of the invention is to provide a sludge removal
device which is simple in design, rugged in construction, and
economical to manufacture.
The various features of novelty which characterize the invention
are pointed out with particularity in the claims annexed to and
forming a part of this specification. For a better understanding of
the invention, its operating advantages and specific objects
attained by its use, reference should be had to the accompanying
drawings and descriptive matter in which there are illustrated and
described preferred embodiments of the invention .
BRIEF DESCRIPTION OF THE DRAWINGS
In the drawings:
FIG. 1 is a top plan view of a sludge removal device constructed in
accordance with the invention;
FIG. 2 is a partial front elevational view of the device indicated
in FIG. 1;
FIG. 3 is a side elevational view of the device;
FIG. 4 is a section taken along the line IV--IV of FIG. 1; and
FIGS. 5, 6 and 7 are side elevational views of three separate
alternate embodiments of the invention.
GENERAL DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to the drawings, in particular, the invention embodied
therein in FIGS. 1 to 4, comprises a sludge removal device
generally designated 50 which is adapted to be moved along a
surface or floor 1 to position sludge material into a front opening
52 of a shovel or scoop generally designated 7. The front opening
52 of the shovel 7 is provided with a forward flexible skirt 13 and
side skirts 11 and 12. The skirt 13 is made shorter than the side
skirts in order to accommodate the sludge material 2 which is to be
picked up through the front end. The interior of the shovel 7
defines a mixing chamber 6.
In accordance with a feature of the invention, the shovel 7 is
provided with a high pressure water conduit 3 which is connected to
discharge liquid through an adjusting valve 5 at a connecting
conduit 54 through one or more nozzles 4 which are oriented to
direct the liquid downwardly against the slurry 2 which is
delivered through the open end 52 and in a manner to cause it to be
whirled and broken up in the mixing chamber 6. A branch conduit 56
extends from the high pressure water conduit 3 backwardly in a
curve to discharge a portion of the high velocity water into a
diffuser 8. The conduit 56 defines a narrow throat section or
venturi 9 which is placed under negative pressure by the discharge
of the liquid through the conduit 56 into the diffuser, so that the
slurry which is formed in the mixing chamber 6 is directed upwardly
through the diffuser 8. The shovel 7 is provided with a valve
control and manipulating handle 10 and it includes a coupling 14
for connecting the high pressure conduit 3 to a water hose or
flexible connection 15. The diffuser 8 is also provided with a
coupling 16 for connecting this part of the device to a discharge
hose connection 17.
The shovel 7 may be manipulated by one or two workers manually or
by means an overhead lifting device to position it so that it moves
along the entire surface of the deck 1 to lift up the sludge 2. The
valve 5 is adjusted to provide the desirable removal action through
the mixing chamber 6 and also to provide the desired jet force
comminuting action on the sludge by liquid exiting through the
nozzles 4. The action of the nozzles 4 causes a breaking down of
the sludge 2 into smaller particles and the formation of a slurry.
A further breaking down of the sludge layer is effected within the
mixing chamber due to the whirling action in this chamber. The
slurry is continuously removed through the venturi 9 and into the
diffuser for the discharge through the discharge connection 17. The
pressure of the water which acts upon the sludge and which provides
the negative pressure for the discharge of the slurry may be
regulated by the valve 5 and normally the pressure within the range
of 7 to 8 killograms per square centimeter will be sufficient.
The shovel 7 of the invention permits removal of sludge by one or
more workers who may rapidly move the shovel over the surface to be
cleaned without requiring the use of shovels or buckets and lifting
winches which were required before the present invention.
In the embodiment illustrated in FIG. 5, there is provided a sludge
removal device generally designated 60 which includes parts which
are similar to the first embodiment and which are designated with
the same number but with the addition of a prime. This construction
differs from the embodiment indicated in FIG. 1, principally in
respect to the location of the diffuser 8' at a remote location
from the shovel 7'. The diffuser 8' is supplied with a high
velocity jet of liquid through a valve 62 and a conduit 64 which is
connected to the high velocity liquid conduit 15'. The liquid from
the conduit 64 is discharged through conduit 9 to form an ejector
action and a negative pressure on a flexible discharge connection
19' between the shovel 7' and the diffuser 8'. The diffuser 8' has
a discharge which is connected to a flexible hose 17'.
In the embodiment of FIG. 6, parts which are similar to the
embodiments of FIGS. 1 and 5 are similarly designated but with
double primes and the principle distinction of this construction
over that indicated in FIG. 5 is that the shovel includes a filter
or screen 20 which is disposed across the width thereof at the
interior to provide an impounding screen or grate onto which the
slurry is directed and against which the high velocity liquid is
directed from the nozzles 4". The mesh size of the screen 20 is
advantageously such that the length of the diagonal is about 90
percent of the internal diameter of the slurry discharge pipe 19".
The filter 20 prevents the movement of lumps through the device and
provides an impounding surface on which the lumps may be broken
down by the water jet issuing from the nozzles 4". The filter
member 20 also carries out a control of the concentration slurry
which is over a certain size as determined by the mesh of the
screen.
In the construction indicated in FIG. 7, there is provided a sludge
removal device generally designated 60'". In this embodiment, parts
which are similar to that of the other embodiments are similarly
numerically designated but with the addition of a triple prime. In
this construction, the shovel 7'" is provided with a first stage
mixing chamber 6'" and a second stage chamber 66'" which receives
the slurry from the chamber 6'" and which provides a further
comminuting or pulverizing action on the sludge material. To obtain
this action the apparatus includes a branch conduit 70 which
connects to a ring conduit 72 having a plurality of nozzle elements
22 which whirl liquid into a tubular member 21 defining the chamber
66. The nozzles 22 provide water turning streams providing a
whirling and breaking action on the sludge material to ensure that
the whole mass is formed into a uniform slurry which is delivered
through a flexible conduit 19'". The turning chamber 66 ensures
that the sludge will be delivered through the discharge connection
17'" in a very fine form without any lumps.
* * * * *