U.S. patent application number 12/749153 was filed with the patent office on 2010-12-23 for waste pumping system.
Invention is credited to David R. Gilbert, William Schmidt.
Application Number | 20100319116 12/749153 |
Document ID | / |
Family ID | 43352987 |
Filed Date | 2010-12-23 |
United States Patent
Application |
20100319116 |
Kind Code |
A1 |
Schmidt; William ; et
al. |
December 23, 2010 |
Waste Pumping System
Abstract
A waste pumping system is provided that includes a tank having a
floor, a body, and a tank inlet. Embodiments include those wherein
the system includes a first designated area formed by a first
baffle portion and the body, a second designated area formed by a
second baffle portion and the body, and a third baffle portion for
directing material toward the first designated area. In some
embodiments, the system includes a pump substantially disposed
within the first designated area and a sensing system substantially
disposed within the second designated area for activating the pump
when material within the tank reaches a predetermined level.
Inventors: |
Schmidt; William;
(Leitchfield, KY) ; Gilbert; David R.;
(Loulsville, KY) |
Correspondence
Address: |
STOLL KEENON OGDEN PLLC
2000 PNC PLAZA, 500 WEST JEFFERSON STREET
LOUISVILLE
KY
40202-2828
US
|
Family ID: |
43352987 |
Appl. No.: |
12/749153 |
Filed: |
March 29, 2010 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
61219657 |
Jun 23, 2009 |
|
|
|
Current U.S.
Class: |
4/353 ; 137/395;
137/565.01 |
Current CPC
Class: |
E03F 5/22 20130101; Y10T
137/7313 20150401; Y10T 137/85978 20150401 |
Class at
Publication: |
4/353 ; 137/395;
137/565.01 |
International
Class: |
E03D 1/00 20060101
E03D001/00; E03B 11/16 20060101 E03B011/16 |
Claims
1. A pumping system comprising: a tank having a floor, a body, and
a tank inlet; a first designated area formed by a first baffle
portion and the body; a second designated area formed by a second
baffle portion and the body; and a third baffle portion for
directing material toward the first designated area.
2. The pumping system of claim 1, wherein the first baffle portion,
the second baffle portion, and the third baffle portion are formed
from a single baffle sheet.
3. The pumping system of claim 1, further comprising a fourth
baffle portion for directing material entering the tank inlet
toward one of: the third baffle portion, the floor and the first
designated area.
4. The pumping system of claim 3, wherein the first baffle portion,
the second baffle portion, the third baffle portion, and the fourth
baffle portion are formed from a single baffle sheet.
5. The pumping system of claim 3, wherein the fourth baffle portion
extends from the second baffle portion.
6. The pumping system of claim 3, wherein the fourth baffle portion
is substantially vertical and has a concave surface with respect to
the tank inlet.
7. The pumping system of claim 1, wherein the first baffle portion
and the second baffle portion are substantially vertical and
semi-circular.
8. The pumping system of claim 1, further comprising a gap between
the first baffle portion and one of: the floor and the body, and a
gap between the second baffle portion and one of: the floor and the
body.
9. The pumping system of claim 1, wherein the third baffle portion
extends from the second baffle portion.
10. The pumping system of claim 1, wherein the third baffle portion
comprises a ramp sloping downward toward the first designated
area.
11. The pumping system of claim 10, wherein the third baffle
portion has a curved surface.
12. The pumping system of claim 1, further comprising a pump
substantially disposed within the first designated area.
13. The pumping system of claim 12, further comprising a sensing
system substantially disposed within the second designated area for
activating the pump when material within the tank reaches a
predetermined level.
14. The pumping system of claim 1, further comprising a sensing
system substantially disposed within the second designated
area.
15. The pumping system of claim 1, further comprising a toilet
having an outlet in fluid communication with the tank inlet.
16. The pumping system of claim 1, wherein the floor descends from
a portion of the tank opposite the first designated area toward the
first designated area.
17. A pumping system comprising: a tank having a floor, a body, and
a tank inlet; a pump disposed substantially within the tank; a
sensing system disposed substantially within the tank for
activating the pump when material within the tank reaches a
predetermined level; means for shielding the pump; means for
shielding the sensing system; and means for directing flow toward
the pump.
18. The pumping system of claim 17, wherein the pump is
substantially contained within a first designated area and the
sensing system is substantially contained within a second
designated area.
19. The pumping system of claim 17, wherein the means for shielding
the pump, the means for shielding the sensing system, and the means
for directing flow toward the pump are formed from a single
structural element.
20. The pumping system of claim 17, further comprising means for
deflecting the inlet flow.
21. The pumping system of claim 20, wherein the means for shielding
the pump, the means for shielding the sensing system, the means for
directing flow toward the pump, and the means for deflecting the
inlet flow are formed from a single structural element.
22. The pumping system of claim 17, further comprising a toilet
having an outlet in fluid communication with the tank inlet.
23. The pumping system of claim 17, wherein the floor descends from
a portion of the tank opposite the pump toward the pump.
24. A pumping system comprising: a tank having a floor, a body, and
a tank inlet; a first designated area formed by a first baffle
portion and the body; a second designated area formed by a second
baffle portion and the body; a pump substantially disposed within
the first designated area; a sensing system substantially disposed
within the second designated area for activating the pump when
material within the tank reaches a predetermined level; a third
baffle portion extending from the second baffle portion for
directing material toward the first designated area; a fourth
baffle portion extending from the second baffle portion for
directing material entering the tank inlet toward one of: the third
baffle portion, the floor and the first designated area; and the
first baffle portion, the second baffle portion, the third baffle
portion, and the fourth baffle portion being formed from a single
baffle sheet.
25. The pumping system of claim 24, wherein the first baffle
portion and the second baffle portion are substantially vertical
and semi-circular.
26. The pumping system of claim 24, further comprising a gap
between the first baffle portion and one of: the floor and the
body, and a gap between the second baffle portion and one of: the
floor and the body.
27. The pumping system of claim 24, wherein the third baffle
portion comprises a curved ramp sloping downward toward the first
designated area.
28. The pumping system of claim 24, wherein the fourth baffle
portion is substantially vertical and has a concave surface with
respect to the tank inlet.
29. The pumping system of claim 24, further comprising a toilet
having an outlet in fluid communication with the tank inlet.
30. The pumping system of claim 24, wherein the floor descends from
a portion of the tank opposite the first designated area toward the
first designated area.
Description
CROSS REFERENCES TO RELATED APPLICATIONS
[0001] This application claims priority to U.S. Provisional
Application No. 61,219,657 filed on Jun. 23, 2009. This application
is related to U.S. patent application Ser. No. ______ entitled
"Grinder Pump" assigned to the same assignee as the present
application.
BRIEF DESCRIPTION OF THE DRAWINGS
[0002] FIG. 1 is a cutaway perspective view of a waste pumping
system according to multiple embodiments and alternatives;
[0003] FIG. 2 is a plan view of a waste pumping system according to
multiple embodiments and alternatives;
[0004] FIG. 3 is an exploded view of a waste pumping system
according to multiple embodiments and alternatives;
[0005] FIG. 4 is an exploded view of a waste pumping system showing
a toilet according to multiple embodiments and alternatives;
[0006] FIG. 5 is an exploded view of a waste pumping system
according to multiple embodiments and alternatives;
[0007] FIG. 6 is a perspective view of a baffle system according to
multiple embodiments and alternatives;
[0008] FIG. 7 is a plan view of a baffle system according to
multiple embodiments and alternatives;
[0009] FIG. 8 is a cutaway perspective view of a pump according to
multiple embodiments and alternatives;
[0010] FIG. 9 is perspective view of a pump according to multiple
embodiments and alternatives;
[0011] FIG. 10 is a side elevation view of a waste pumping system
according to multiple embodiments and alternatives;
[0012] FIG. 11 is a perspective view of a pump housing according to
multiple embodiments and alternatives;
[0013] FIG. 12 is a plan view of a cutter plate according to
multiple embodiments and alternatives;
[0014] FIG. 13 is a perspective view of a cutter plate according to
multiple embodiments and alternatives;
[0015] FIG. 14 is a plan view of a cutter blade according to
multiple embodiments and alternatives;
[0016] FIG. 14a is a side elevation view of a cutter blade
according to multiple embodiments and alternatives;
[0017] FIG. 15 is a perspective view of a cutter blade according to
multiple embodiments and alternatives;
[0018] FIG. 16 is an exploded view of a pump according to multiple
embodiments and alternatives.
MULTIPLE EMBODIMENTS AND ALTERNATIVES
[0019] Multiple embodiments and alternatives are provided for a
waste pumping system 10 and a pump 100. With reference to FIG. 10,
an embodiment of a waste pumping system 10 collects and disposes of
waste from a toilet 20. Embodiments include those wherein the
toilet 20 is a conventional, rear outlet toilet. Waste passes from
the toilet 20 through a toilet outlet 22 into a tank 30. The tank
30 includes a tank floor 40 as shown in FIGS. 1 and 2 and a tank
body 42 as shown in FIGS. 4 and 5. The tank floor 40 and the tank
body 42 are joined hermetically to create the tank 30. The tank 30
is manufactured of conventional materials commonly utilized in
bathroom fixtures including but not limited to plastics and
porcelain.
[0020] With reference to FIGS. 3 and 4, waste and fluid from the
toilet 20 flows into the tank 30 through the tank inlet 33.
Embodiments include those wherein the tank inlet 33 is disposed on
the front side 32 of the tank 30. In some embodiments, the tank
inlet 33 is located on the lower portion of the front side 32 of
the tank 30; this permits connection of the tank 30 to
conventional, rear outlet toilets 20. For example, embodiments
include those wherein the center of the tank inlet 33 is located
about 4 inches from the bottom edge of the tank 30. In other
embodiments, the center of the tank inlet 33 is located about 7
inches from the bottom edge of the tank 30.
[0021] With reference to FIG. 10, alternative embodiments include
those wherein the toilet 20 is connected to the tank inlet 33 with
attachment piping 74. In some embodiments, the attachment piping 74
is adjustable such that the tank 30 can be attached to toilets 20
with toilet outlets 22 at various heights. The attachment piping 74
may be comprised of conventional materials suitable for attachment
to both the toilet outlet 22 and the tank inlet 33.
[0022] The waste pumping system 10 further includes a pump 100 with
a pump inlet 102 as shown in FIG. 8. With reference to FIG. 1,
embodiments include those wherein the tank 30 includes a first
designated area 43. In multiple embodiments, the pump inlet 102 is
disposed within the first designated area 43. In some embodiments,
the pump 100 is substantially contained within the first designated
area 43. In some embodiments, the pump 100 is mounted to the tank
30.
[0023] Embodiments include those wherein the floor 40 of the tank
30 gradually descends from the side of the tank 30 located furthest
from the first designated area 43 to the pump 100 itself. This
descent promotes the efficient evacuation of the tank 30.
Embodiments include those wherein the angle of descent of the floor
40 to the pump 100 is at least about 2.degree.-5.degree.; however,
embodiments include those wherein the angle of descent is provided
in any suitable angle.
[0024] In multiple embodiments, the tank 30 includes a second
designated area 44. Embodiments include those wherein the second
designated area 44 contains a sensing system 45 which senses a
volume, pressure, level and/or quantity of material and/or fluid
within the tank 30. Embodiments of the sensing system 45 are
capable of sensing the presence of fluid or material within the
tank 30 and activating the pump 100. For example, in some
embodiments, the sensing system 45 senses the presence of fluid or
material within the tank 30 and activates the pump 100. In one
embodiment, the sensing system 45 is a float system 46 which
controls activation of the pump 100 as shown in FIG. 3. The float
system 46 is conventional in design and operation. However,
embodiments include those wherein a sensing system 45 senses the
volume, pressure, level or quantity of material and/or fluid within
the tank 30, such as, for example, an electronic probe (not shown)
for sensing the volume of fluid within the tank 30.
[0025] With reference to FIG. 6, embodiments include those wherein
the tank 30 includes a baffle system 52 comprised of at least one
baffle 53. The number of baffles 53 as well as their locations and
shapes are arranged as desired in order to provide an efficient
flow of material through the tank 30 toward the pump 100. The
baffles 53 may be constructed of any sturdy material including but
not limited to plastic. In some embodiments, the baffles 53 are
constructed of the same material as is the tank 30.
[0026] With reference to FIGS. 1 and 2, in multiple embodiments,
the baffle system 52 includes a means for shielding the pump 100.
The means for shielding the pump 100 operates as a divider between
the tank inlet 33 and the pump 100 and shields the pump 100 from
initial contact with at least a portion of the material entering
the tank 30 through the tank inlet 33. In some embodiments, the
means for shielding the pump 100 consists of a first baffle portion
54 formed from at least one baffle 53 which shields the pump 100
from initial contact with at least a portion of the material
entering the tank 30 through the tank inlet 33. In some
embodiments, the first baffle portion 54 also aids in directing
material downward such that the material can be further directed
toward the pump 100. Embodiments include those wherein the first
designated area 43 is formed by the first baffle portion 54 and the
sides of the tank 30. In some embodiments, the height of the first
baffle portion 54 is sufficient so that material which enters the
tank 30 cannot flow over the top of the first baffle portion 54.
Thus, in some embodiments, the height of the first baffle portion
54 is at least as high as the top of the toilet outlet 22. In some
embodiments, the first baffle portion 54 is substantially vertical
with respect to the tank floor 40. In some embodiments, the first
baffle portion 54 consists of a semi-circular baffle portion. The
first baffle portion 54 permits material to flow into the first
designated area 43. In some embodiments, there is at least one gap
between the first baffle portion 54 and the tank floor 40, thereby
permitting fluid to flow into the first designated area 43. In some
embodiments, there is at least one gap between the first baffle
portion 54 and at least one wall of the tank 30, thereby permitting
fluid to flow into the first designated area 43.
[0027] In multiple embodiments, the baffle system 52 includes a
means for shielding the sensing system 45. The means for shielding
the sensing system 45 operates as a divider between the tank inlet
33 and the sensing system 45 and shields the sensing system 45 from
initial contact with at least a portion of the material entering
the tank 30 through the tank inlet 33. In some embodiments, the
means for shielding the sensing system 45 consists of a second
baffle portion 55 formed from at least one baffle 53 which shields
the sensing system 45 from initial contact with at least a portion
of the material entering the tank 30 through the tank inlet 33. In
some embodiments, the second baffle portion 55 also aids in
directing material downward such that the material can be further
directed toward the pump 100. Embodiments include those wherein the
second designated area 44 is formed by the second baffle portion 55
and the sides of the tank 30. In some embodiments, the height of
the second baffle portion 55 is sufficient so that material which
enters the tank 30 cannot flow over the top of the second baffle
portion 55. Thus, in some embodiments, the height of the second
baffle portion 55 is at least as high as the top of the toilet
outlet 22. In some embodiments, the second baffle portion 55 is
substantially vertical with respect to the tank floor 40. The
second baffle portion 55 permits material to flow into the second
designated area 44. In some embodiments, there is at least one gap
between the second baffle portion 55 and the tank floor 40, thereby
permitting fluid to flow into the second designated area 44. In
some embodiments, there is at least one gap between the second
baffle portion 55 and at least one wall of the tank 30, thereby
permitting fluid to flow into the second designated area 44.
[0028] In multiple embodiments, the baffle system 52 includes a
means for directing flow towards the first designated area 43. In
some embodiments, the means for directing flow towards the first
designated area 43 consists of a third baffle portion 56 formed
from at least one baffle 53 which directs the flow of material
toward the first designated area 43 as shown in FIG. 1. Embodiments
include those wherein the third baffle portion 56 consists of a
ramp that slopes downward toward the first designated area 43 in
order to direct material entering the tank inlet 33 toward the pump
100. In some embodiments, the third baffle portion 56 directs
material away from the second designated area 44 and towards the
first designated area 43. In some embodiments, the third baffle
portion 56 extends from the second baffle portion 55. Embodiments
include those wherein the third baffle portion 56 has a curved
surface. The third baffle portion 56 promotes the evacuation of the
materials entering the tank 30 by directing flow towards the pump
100.
[0029] In multiple embodiments, the baffle system 52 includes a
means for deflecting the inlet flow. With reference to FIGS. 1 and
2, in some embodiments, the means for deflecting the inlet flow
consists of a fourth baffle portion 57 formed from at least one
baffle 53 which directs material entering the tank inlet 33 toward
the third baffle portion 56, the tank floor 40 or the pump 100. In
some embodiments, the height of the fourth baffle portion 57 is
sufficient so that material which enters the tank 30 cannot flow
over the top of the fourth baffle portion 57. Thus, in some
embodiments, the height of the fourth baffle portion 57 is at least
as high as the top of the toilet outlet 22. In some embodiments,
the fourth baffle portion 57 is substantially vertical with respect
to the tank floor 40. In some embodiments, the fourth baffle
portion 57 extends from the second baffle portion 55 and forms a
concave surface with respect to the tank inlet 33 thereby directing
material both downward toward the third baffle portion 56 and
laterally toward the first designated area 43.
[0030] With reference to FIG. 6, embodiments include those wherein
the baffle system 52 includes any or all of the following baffle
portions: the first baffle portion 54, the second baffle portion
55, the third baffle portion 56, and the fourth baffle portion 57.
In some embodiments, the baffle system 52 consists of one baffle
53. In some embodiments, this baffle 53 is comprised of a single
folded sheet as shown in FIG. 7.
[0031] With reference to FIG. 1, embodiments include those wherein
the arrangement of the baffle system 52 creates a fill differential
within the tank 30. Regarding the fill differential, further
details are provided as follows. As fluid enters the tank 30, the
first designated area 43 fills faster than the second designated
area 44 due to the encouragement of flow toward the first
designated area 43 thereby creating a differential in the level of
fluid between the first designated area 43 and the second
designated area 44, i.e., the fill differential. This allows the
first designated area 43 to fill before the sensing system 45
activates the pump 100. As the pump 100 evacuates the first
designated area 43, fluid and material in the second designated
area 44 move toward the first designated area 43; however, the
level of fluid in the second designated area 44 typically remains
higher than the level of fluid in the first designated area 43
thereby keeping the pump 100 energized. This ensures that
substantially all of the material from the toilet 20 is pumped from
the tank 30.
[0032] In multiple embodiments, the tank 30 also includes baffles
53 which extend vertically from the tank floor 40 and protect the
second designated area 44 and the sensing system 45 from build up
of solid waste discharged from the toilet 20. In some embodiments,
the second designated area 44 is located on the up-stream side of
the tank inlet 33 of the tank 30. By locating the second designated
area 44 and the sensing system 45 on the up-stream side of the tank
inlet 33 of the tank 30, the pattern of flow of material entering
the tank inlet 33 is directed away from the sensing system 45
toward the pump 100. In some embodiments, the flow of the material
away from the second designated area 44 toward the pump 100 creates
a suction effect within the tank 30 which draws material and fluid
that may be contained in the second designated area 44 toward the
pump 100.
[0033] Embodiments include those wherein the waste pumping system
10 includes components which activate an alarm 47 when the level of
material within the tank 30 is excessively high as selectably
chosen by a user as shown in FIG. 1. For example, embodiments
provide a high water alarm such as the Flood Alert.RTM., produced
by Zoeller Company, that is placed within the tank 30. Appropriate
electrical connections can be made to the alarm 47 to provide
electricity for the operation of the system. In some embodiments,
the waste pumping system 10 is used to receive and pump fluids from
multiple locations, such as from showers and water faucets.
Embodiments include those wherein fluids from these other sources
enter the tank 30 through secondary inlets 70. In some embodiments,
the design of the floor 40 of the tank 30 encourages the flow of
fluids entering via secondary inlets 70 toward the pump 100.
Alternatives include those wherein the floor 40 near the secondary
inlet 70 is curved to assist in prevention of the build up of
solids and to assist in the flow of material toward the pump
100.
[0034] With reference to FIG. 8, embodiments include those wherein
the pump 100 operates as a grinder pump. It will be readily
understood by those in the art that the pump 100 may be used not
only with the waste pumping system 10 but also with any other
appropriate application for grinder pumps. For example, embodiments
include those wherein the pump 100 is used in a pump basin under a
sink for grinding up food and other materials rinsed down a sink.
The pump 100 includes a motor 120, a pump housing 122, an impeller
110, a shaft 114, a base 112 and the pump inlet 102. In some
embodiments, the pump 100 operates as a centrifugal pump. In some
embodiments, the pump 100 includes a mechanical seal 118 capable of
sealing the pump 100 even if operated at high speeds, in some
instances greater than 5000 rpm, and capable of withstanding
sustained periods of dry run. With reference to FIG. 11, the pump
100 further includes a cutter plate 104 disposed at the pump inlet
102. The cutter plate 104 may be comprised of any suitable material
including but not limited to stainless steel. The cutter plate 104
includes a series of holes 106. Fluid and material entering the
pump inlet must pass through the holes 106. This ensures that
solids are ground small enough to enter the pump inlet 102. The
fluid and material then enters a pump chamber 108 as shown in FIG.
8. The impeller 110 is capable of pumping materials in the pump
chamber 108 out through a discharge pipe 96.
[0035] In multiple embodiments, the pump 100 further includes a
cutter blade 92 disposed substantially adjacent to the cutter plate
104 as shown in FIG. 11. Further embodiments provide that the
cutter blade 92 is in direct contact with the cutter plate 104. The
cutter blade 92 is movable in relation to the cutter plate 104.
Embodiments include those wherein the cutter blade 92 is rotatable.
Alternatives include those wherein the cutter blade 92 is not in
direct contact with the cutter plate 104. Alternatives include
those wherein the separation between the cutter blade 92 and the
cutter plate 104 is provided in a range from 0 to about 1 inch.
Embodiments include those wherein the cutter blade 92 and the
cutter plate 104 are substantially parallel to one another. The
cutter blade 92 may be comprised of any material typically used in
cutting or grinding applications including but not limited to
stainless steel. In some embodiments, the cutter blade 92 is
attached to the shaft 114 such that the shaft 114 is capable of
providing the force required to rotate the cutter blade 92 as shown
in FIG. 8. With reference to FIGS. 14, 14a, and 15, the cutter
blade includes at least one cutting edge 93. In some embodiments,
at least one cutting edge 93 is disposed on the perimeter of the
cutter blade 92. In some embodiments, the cutter blade 92 has two
cutting edges 93 disposed on the perimeter of the cutter blade 92
such that as the cutter blade 92 rotates, each cutting edge 93
faces the same rotational direction. Embodiments include those
wherein the cutter blade 92 is capable of grinding up solids
approaching the pump inlet 102. As the cutter blade 92 rotates, the
cutting edges 93 pass by the holes 106 of the cutter plate
resulting in a shearing effect between the cutting edges 93 and the
holes 106. Solids approaching the pump inlet 102 are thereby ground
up by the cutting edges 93 against the cutter plate 104.
[0036] Embodiments include those wherein the holes 106 on the
cutter plate 104 are substantially oval or oblong in shape as shown
in FIGS. 12 and 13. In some embodiments, each hole 106 is angled in
the direction of rotation of the cutter blade 92 as shown in FIG.
11. In this configuration, as the cutter blade 92 rotates and
travels along a hole 106, the overlap between each cutting edge 93
and the hole 106 moves along the hole 106 away from the
center-point of the cutter blade's rotation. The shape and angle of
the holes 106 maximize the interaction between each cutting edge 93
and each hole 106 thereby increasing the cutting ability of the
cutter blade 92. This increased cutting ability reduces the motor
torque and cutting force required to reduce and grind up solids
entering the pump inlet 102.
[0037] Alternatives include a pump 100 that is capable of reverse
cut functionality. In these alternatives, the cutter blade 92 is
capable of rotating in a first direction as well as a second
direction wherein the second direction is opposite the first
direction. In some embodiments, the cutter blade 92 is capable of
rotating both clockwise and counter-clockwise as perceived when
facing the pump inlet 102 from the exterior of the pump. In these
alternatives, the cutter blade 92 includes at least two cutting
edges 93 disposed on the perimeter of the cutter blade 92. The
cutter blade 92 has at least one cutting edge 93 that faces
clockwise and at least one cutting edge 93 that faces
counter-clockwise such that there is at least one cutting edge 93
utilized when the cutter blade 92 rotates clockwise and at least
one cutting edge 93 utilized when the cutter blade 92 rotates
counter-clockwise. In some alternatives, the cutter blade 92 has
four cutting edges 93 disposed on the perimeter of the cutter blade
92 such that there are two cutting edges 93 utilized when the
cutter blade 92 rotates clockwise and two cutting edges 93 utilized
when the cutter blade 92 rotates counter-clockwise. Embodiments
include those wherein the reverse cut functionality allows the pump
100 to unwind material that becomes wound up in the cutter blade
92.
[0038] With reference to FIGS. 14 and 15, embodiments include those
wherein the cutter blade 92 includes at least one relief hole 91.
Alternatives include a cutter blade 92 with two relief holes 91. In
some embodiments, each relief hole 91 includes at least one cutting
edge 93. In some embodiments, the angle of each cutting edge 93
within a relief hole 91 with respect to the face of the cutter
plate 104 is between about 0.degree. and about 90.degree.. In some
embodiments, the angles of the cutting edges 93 within the relief
holes 91 are substantially equal to the angles of the cutting edges
93 disposed on the perimeter of the cutter blade 92. Alternatives
include those wherein the angles of the cutting edges 93 within the
relief holes 91 are not equal to the angles of the cutting edges 93
disposed on the perimeter of the cutter blade 92. Alternatives
include those wherein each relief hole 91 has one cutting edge 93
such that as the cutter blade 92 rotates, each cutting edge 93
faces in the same rotational direction. Alternatives include those
wherein each relief hole 91 has at least two cutting edges 93 such
that in alternatives wherein the cutter blade 92 is capable of
rotating both clockwise and counter-clockwise, each relief hole 91
has a cutting edge 93 which faces clockwise and each relief hole 91
has a cutting edge 93 which faces counter-clockwise. The inclusion
of a cutting edge 93 within each relief hole 91 increases the
cutting ability of the cutter blade 92. This, in turn, reduces the
motor torque and cutting force required to reduce and grind up
solids entering the pump inlet 102. The relief holes 91 also allow
material trapped under the cutter blade 92 to escape thereby
substantially reducing the occurrence of binding of the cutter
blade 92.
[0039] With reference to FIG. 11, embodiments include those wherein
the pump inlet 102 includes a ring 107. The ring 107 extends
outward from the pump inlet 102 in a substantially circular manner.
The ring 107 is capable of channeling fluid and material into the
pump inlet 102 such that fluid and material enters the pump inlet
102 with a substantially perpendicular approach with respect to the
cutter plate 104. This substantially reduces the opportunity for
solids to catch and become trapped underneath the cutter blade 92
and wrap around the shaft 114.
[0040] In some embodiments, the ring 107 is bolted to the pump
housing 122 at the pump inlet 102 as shown in FIG. 16. However, the
ring 107 may attach to the pump 100 by any suitable means.
Alternatively, the ring 107 may be a part of the pump housing 122.
Alternatives include those wherein the ring 107 secures the cutter
plate 104 to the pump housing 122 at the pump inlet 102. However,
the cutter plate 104 may be attached to the pump 100 by any
suitable means.
[0041] In multiple embodiments, the arrangement and design of the
cutter blade 92 and the cutter plate 104 and holes 106 increases
the cutting ability of the cutter blade 92 and thereby minimizes
the motor torque and cutting force required to effectively reduce
and grind up solids entering the pump inlet 102. This allows the
pump 100 to operate with a lower horsepower motor 120 than existing
grinder pumps without sacrificing cutting ability or cutting
efficiency. For example, the pump 100 is capable of substantially
reducing items typically found in sanitary sewage applications such
as, for example, feces, disposable diapers, sanitary napkins, paper
towels, rubber materials, and plastics while operating with a motor
120 of 0.5 hp.
[0042] Embodiments include those wherein the pump 100 includes a
discharge opening 94 as shown in FIG. 9. Embodiments include those
wherein the discharge opening 94 is disposed in the base 112. The
discharge opening 94 prevents air locking and also produces a jet
stream of fluid to assist in the flow of material within the tank
30. In some embodiments, the discharge opening 94 is designed to
expel fluid from the pump 100 under pressure toward the at least
one baffle 53. Embodiments include those wherein the fluid from the
discharge opening 94 creates a flow pattern which encourages the
flow of material toward the pump 100. In some embodiments, this
flow pattern created by the discharge of fluid from the discharge
opening 94 also creates a suction effect, drawing fluid away from
the second designated area 44. This aids in keeping the second
designated area 44 clean from solid waste.
[0043] With reference to FIGS. 3-5, embodiments include those
wherein the tank 30 is covered by a tank cover 60. The tank cover
60 provides easy access to the tank 30 and the pump 100.
Alternatives include those wherein the tank cover 60 includes an
opening for a vent pipe 98. The vent pipe 98 vents gases contained
with the waste pumping system 10. In some embodiments, the tank
cover 60 includes an opening for the discharge pipe 96. The tank
cover 60 may further include other openings for other purposes.
[0044] In multiple embodiments, waste is discharged from the toilet
20 through the toilet outlet 22 through the tank inlet 33 into the
tank 30 as shown in FIG. 4. With reference to FIG. 1, upon entering
the tank 30, the waste encounters the fourth baffle portion 57
which directs the flow of waste toward the third inlet portion 56
which encourages the flow of material toward the pump 100. Once the
level of material in the second designated area 44 reaches a
predetermined level, the sensing system 45 activates the pump 100.
Flow is further encouraged by the liquid expelled under force
through the discharge opening 94 in the pump 100 once the pump 100
has been activated as shown in FIG. 9. The material then enters the
pump 100 where it is ground up by use of the cutting blade 92 and
is discharged through the discharge pipe 96 to an above-grade
piping system by the pumping action of the impeller 110 as shown in
FIG. 11.
[0045] It will therefore be readily understood by those persons
skilled in the art that the embodiments and alternatives of a waste
pumping system 10 and a pump 100 are susceptible to a broad utility
and application. While the embodiments are described in all
currently foreseeable alternatives, there may be other,
unforeseeable embodiments and alternatives, as well as variations,
modifications and equivalent arrangements that do not depart from
the substance or scope of the embodiments. The foregoing disclosure
is not intended to be construed to limit the embodiments or
otherwise to exclude such other embodiments, adaptations,
variations, modifications and equivalent arrangements, the
embodiments being limited only by the claims appended hereto and
the equivalents thereof.
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