Agitating – Stirrer within stationary mixing chamber – Pump type
Reexamination Certificate
2001-08-21
2004-03-02
Cooley, Charles E. (Department: 1723)
Agitating
Stirrer within stationary mixing chamber
Pump type
C417S423300, C417S423900
Reexamination Certificate
active
06698916
ABSTRACT:
BACKGROUND OF THE INVENTION
(1) Field of the Invention
The present invention relates to an underwater agitation pump which can suck soil, sand or the like which contains block-like material or string-like material in a dredging site, civil engineering work site, a sewage treatment plant, a sedimentation pool or a pit within a plant, an inside of a manhole or the like while efficiently agitating such soil, sand or the like and can discharge such sand, soil or the like to a given place.
(2) Description of the Related Art
Conventionally, as an underwater agitation pump which is served for the above-mentioned usage, there has been known an underwater agitation pump
100
which has a constitution shown in
FIG. 19
, for example.
As shown in the drawing, in this underwater agitation pump
100
, an impeller casing
101
having a hollow disc-like shape is provided with a center suction opening portion
102
at a center portion of a lower surface thereof and a discharge opening portion
104
which is connected to a discharge pipe
103
at a peripheral portion thereof. In the inside of the impeller casing
101
, a disc-like impeller
105
is rotatably disposed. The impeller
105
is provided with a center suction opening portion
106
at a center portion of a lower surface thereof and forms a plurality of radial flow passages
107
in the inside thereof in a circumferentially spaced-apart manner. Further, the impeller
105
is fitted on and is connected to an output shaft
109
of a water-tight motor
108
which is mounted on an upper surface of the impeller casing
101
.
Further, a cylindrical strainer
111
having a bottom wall
110
is contiguously mounted on a lower portion of the impeller casing
101
and an annular support frame
112
is mounted on a lower surface of the cylindrical strainer
111
.
Still further, the output shaft
109
of the water-tight motor
108
to which the impeller
105
is fixedly secured is extended downwardly after passing through the center suction opening portion
106
of the impeller
105
, the center suction opening portion
102
of the impeller casing
101
and the cylindrical strainer
111
and forms an agitator mounting shaft
113
. An agitator (cutter fan)
114
which protrudes a plurality of blade members in the radial direction from an outer peripheral surface of a body thereof is fixedly secured to a distal end of the agitator mounting shaft
113
.
Due to such a constitution, when the watertight motor
108
is driven, the impeller
105
and the agitator
114
are integrally rotated so that a negative pressure is generated in the inside of the impeller casing
101
and soil, sand or the like which is piled up below the underwater agitation pump
100
is agitated by the agitator
114
. Accordingly, the agitated soil, sand or the like is sucked into the impeller casing
101
through the cylindrical strainer
111
and thereafter is discharged to a desired place through the discharge opening portion
104
and the discharge pipe
103
.
However, the above-mentioned underwater agitation pump
100
still has a following task to be solved. That is, as shown in
FIG. 19
, the agitator mounting shaft
113
which mounts the agitator
114
on the distal end thereof passes through the center suction opening portion
106
of the impeller
105
and the center suction opening portion
102
of the impeller casing
101
. Accordingly, as shown in
FIG. 20
, a soil/sand inflow effective area A
2
is formed of a narrow annular area which is defined between an inner peripheral surface of the center suction opening portion
106
or the center suction opening portion
102
and an outer peripheral surface of the agitator mounting shaft
113
.
Accordingly, when block-like material or string-like material is mixed in the soil, sand or the like, such string-like material or flexible cloths such as vinyl cloths or the like are entangled in the agitator
114
, the agitator mounting shaft
113
, the cylindrical strainer
111
or the like and the block-like material and the string-like material clog the soil/sand inflow effective area A
2
. As a result, the operation of the underwater agitation pump becomes difficult or impossible so that there is a possibility that the soil/sand suction operation becomes difficult or impossible.
The present invention has been made to solve such a drawback and it is an object of the present invention to provide an underwater agitation pump which can reliably and efficiently suck and discharge soil, sand or the like even when the sand, soil or the like includes block-like material or string-like material.
SUMMARY OF THE INVENTION
To achieve the above-mentioned object, according to a first aspect of the present invention, there is provided an underwater agitation pump which comprises an impeller casing in which an impeller driven by a motor is rotatably accommodated, an agitated material suction guide cylinder being constituted of a hollow cylinder which has one-end opening portion thereof integrally connected to a center suction opening portion of the impeller while passing through a center opening of the impeller casing and having the other-end opening portion thereof extended downwardly, the agitated material suction guide cylinder further forming an agitated material suction passage in the inside thereof, and an agitator which is mounted on an outer periphery of the other-end opening portion of the agitated material suction guide cylinder.
In the above-mentioned constitution, a proximal end of the agitated material suction guide cylinder which is formed of the hollow cylinder is directly communicably connected with the center suction opening portion of the impeller and the agitator is mounted on the outer peripheral portion of the distal end of the agitated material suction guide cylinder. Accordingly, it becomes possible to make an inner diameter of the agitated material suction guide cylinder substantially equal to an inner diameter of the center suction opening portion of the impeller and an agitator mounting shaft which has been necessary in a conventional underwater agitation pump is made unnecessary, whereby the agitated material suction passage formed in the inside of the agitated material suction guide cylinder can ensure a sufficiently wide agitated material inflow area. Accordingly, it becomes possible to sufficiently agitate soil, sand or the like in which block-like material or string-like material is mixed with use of the agitator and, at the same time, it is possible to smoothly suck such soil, sand or the like in which the block-like material or the string-like material is mixed into the impeller casing through the agitated material suction guide cylinder.
Further, since it becomes possible to make an outer diameter of the agitated material suction guide cylinder substantially equal to the inner diameter of the center suction opening portion of the impeller, compared to the agitator mounting shaft of the conventional underwater agitation pump which mounts an agitator on a distal end thereof, the outer diameter of the agitated material suction guide cylinder can be remarkably increased so that the winding or the wrapping of the string-like material around the agitated material suction guide cylinder can be reliably prevented. Further, compared to the agitator mounting shaft of the conventional underwater agitation pump, the outer diameter of the agitated material suction guide cylinder can be remarkably increased and hence, the section modulus can be remarkably increased so that the mechanical strength of the agitated material suction guide cylinder can be increased whereby it becomes possible to increase the agitator supporting strength and to prevent the rapture or the like of the agitated material suction guide cylinder reliably.
Still further, since the other-end opening portion of the agitated material suction guide cylinder which forms an suction opening of the agitated material is formed at a position which is downwardly protruded from the center suction opening portion of the impeller, such a suction opening can be loca
Browdy and Neimark , P.L.L.C.
Toyo Denki Industrial Co., Ltd.
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