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Патент USA US2105428

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Jan. 11, 1938.
Filed June 2, 1954
Patented Jan. 11, 1938
George F. Maglott, Cranston, R. I., assignor to
Brown & Sharpe Manufacturing Company, a
corporation of Rhode Island
Application June 2, 1934, Serial No. 728,798
4 Claims. (Cl. 286-7)
This invention relates to a gear pump for
pumping liquid, more particularly a’liquid hav
ing lubricating properties such as fuel oil for
oil burners; and has for one of its objects the
Cil provision of a seal which will both prevent the
escape of the oil from pressure developed on the
inside of pump and prevent any suction developed
within the pump from drawing in air.
Another object of the invention is the provi
sion of a seal which will be unaiïected by the
running out of line of the drive shaft for driving
the pump.
Another object of the invention is the provision
of a common means which will assist the seating
of the seal against pressure developed in the
pump and also assist the seating of the seal
against suction developed in the pump.
Another object of the invention is the circula
tion of the lubricant about the. moving parts
20 and yet maintaining a seal 'of the lubricant in
the pump casing.
Another object of the invention is the pro
vision of a circulation of the material pumped
in such a manner that it will lubricate the mov
25 ing parts in a small pump by arranging certain
of the conduits for the lubricant through the
moving parts as distinguished from through the
fixed part of the casing itself.
Another object of the invention is to cause the
30 lubricant circulation to assist in taking from the
pressure seal some of the pressure which might
otherwise be caused to be exerted thereon and
thus reduce a chance of leakage through this
Fig. 5 is a perspective view of the pump look 5
ing at the outside thereof and also illustrating a
modified construction with reference to that illus
trated in Figures 1 and 2.
In the operation of liquid gear pumps, there
has been considerable difficulty in maintaining a
proper seal about the'drive shaft which extends Y
through the casing and operates one of the gears.
.If this seal were not tight when pressure of the
liquid is developed in the pump, the liquid will
be forced out about the drive shaft, whereas if
the pump were not tight when there is a suction
developed in the' pump casing, air will get in.
With a small bubble of air'in the pump, 'the
pump will hammer and knock and run noisy for
a considerable length of time. This seal is often 20
caused to be imperfect by reason of the wobbling
or the'getting out of line of the drive shaft to
which the seal is frequently attached, and in this
case I have provided a seal which is independent
of the alignment of the drive shaft so that should
the drive shaft be out of true line, the seal will be
effectual to maintain the seal in the pump.
Also, there must be some means provided for
lubricating the operating parts of a gear pump
of this character. Frequently, the liquid which
is to be pumped is of a lubricating quality, such
for instance as the pumping of oil and where this
is the case, as in the uses for which the present
pump is particularly designed, a circulation is
Another object of the invention is the arrange
provided of this liquid about the moving parts
ment ofthe parts so as to maintain a hydrostatic
balance of pressure on both sides of the pumping
so that fresh liquid is continually supplied to
these parts to afford a more perfect lubrication
rather than a stagnant lubrication which occurs
in some pumps, in which case the oil will lose
A further object of the invention is the provi
40 sion of a pump the parts of which are the same
regardless of the direction in which it is to op
erate which may be elected in finishing by
merely choosing the Aarrangement of certain of
-the formed -openings therein.
45 .With these and other objects in view, the in-vention consists of certain novel features of
construction, as will be more fully described, and
particularly pointed out in the appended claims.
In the accompanying drawing:
Fig. l is a sectional view through the pump;
Fig. 2 is a sectional view on line 2-2 ofsFig
ure 1;
Fig. 3 is a sectional view on line 2-2 of Fig
ure 1;
parts fragmentally and the arrangement of my
novel sealing unit and drive transmission be
tween the drive shaft and one of the pumping
Fig. 4 is a perspective view showing some of the
some of its lubricating properties and permits 40
heating within the pump.
Sometimes in pumps of this character where
there is a circulation of the oil, the oil is ex
truded out of the pump and lost, whereas this
invention contains the oil at al1 times in the 45
pump and seals it against escape.
Also, in small pumps it is rather difficult to
provîdea sufficient amount of stock for the for
mation of a conduit for the lubricant, and in
order to economize space, I have provided a
channel through the drive shaft which operates
the gears of the pump and by which'a very em- cient circulation is provided, and I have so ar
ranged the circulation of the liquid in the pump
that it cooperates with the seal to effect a. more
.complete seal by relieving pressure on the seal
. during the running of the pump.
The sealing unit is connected tothe shaft 28
of pressures, I maintain a hydrostatic balance in
the pump on both sides of the pumping elements;
and the following is a more detailed description
by a key 5I entering a slot or recess ¿i9 in the
shaft 20„and slot or recess 58 in the disc 3|, and
-of a length and size „to more' or less loosely fit
advantageous results may be accomplished:-
With reference to the drawing, I@ designates
the body section of the pump, which is provided
with an opening housing the gears II and I2,
which mesh together and about which there is
left a suction pocket I3 and a pressure pocket
15 I5 for the entrance and delivery of the liquid to
therein and yet maintain its driving position.
'I_‘hus any rotation of the sealing means will cause
a rotation of the shaft 25 while allowing the shaft
2@ to be entirely independent of the Isealing means IG
so that any irregular running of the parts within
the pump need not rock the seal from its seat.
The sealing means is driven through the tongue
52 on shaft 35 exten-ding into the slot or recess 53
I provide cap sections or closure members in one
in the disc 32. This slot is sufficiently large so 15.
that there may be a rocking of the shaft 35 in
the slot and any irregularity in alignment with
of which there is- located suitable discharge and
the shaft 30 will not be communicated to the disc
be pumped. At either side of the body element,
Further, by my arrangement and transmission
of the present embodiment of this invention, il
lustrating the preferred means by which these
dit is provided with a ñange @l at its outer end,
and is held in position by suitable bolt 38.
32 and thus accurate alignment of the shaft or
suction conduits.
One end cap section is designated I5, and the
other end cap section I6 which'also has formed
therewith a bracket portion Il in which the seal
ing and driving means are largely mounted. The
cap sections I5 and I6 are held assembled on
25 either side of th/e body section III by suitable bolts
I8 and I9 extending through one of the cap sec
tions, through the body section and threaded into
the other cap section, whereby the sections are
held in assembled relation sufficiently tight so
30 that there will. be no leaking of air into or pump
true running in its bearings is not essential to 20
the maintaining of this seal- in its operating or
working position. The shaft 35 is bushed as at
56. Oil is fed to the bearing through the open
ing which is closed by a set screw 55 to keep out
foreign matter. A shoulder 56 fixed on the shaft 25
30 is engaged by a plate 5T, which plate is held
in place by reason of bolts d8 and which in turn
serves to secure the sleeve and bushing in place »
on the portion I'I of the cap section I 6.
Should any pressure be exerted -on the sealing 30
means from the inside outwardly and liquid be
ing of the liquid out of the casing.
Pumping elements or gears II and I2 may be
forced by the first disc 3 | , then the second disc 32
made integral with or mounted on shafts 2|J^and
would be forced more tightly to its seat by the ad
2| to which they may be securely ñxed against
dition of such pressure assisted. by the spring 38,
35 relative rotation. These shafts have bearings in
the opposite cap sections; thus shaft 20 has' `a
' bearing 22 in the cap section I5, and 23 in the
and thus from the inside provide a tight seal
between the surfaces 45 and 46. Such pressure
-might occur from a head existing in the storage
tank when the pumping elements are not rotat
ing. It is `also of importance that the seal be
maintained against a low pressure developed in
the pump from drawing in air due to a greater
pressure outside, and in this case, the reverse will
be true in that any air entering about the shaft
30 may pass the first disc 32, but this outside
pressure will be exerted against the surface 39 of
» disc 3| to force the disc 3| more ñrmly to its seat,
, cap section I6, while the shaft 2| has a bearing
24 in the cap section I5, and 25 in the cap sec
tion I6:
In this particular embodiment of the invention,
the suction conduit 2’6 and discharge condiuit 2`|
are provided in the cap section I5, the former
communicating with the suction pocket I3, while
45 the discharge conduit 2l communicates kwith the
pressure pocket |4.
Suitable connection may be
had to these conduits by means of the threaded
bores`28 and 29 for the intake and delivery of the
liquid to be pumped.
The gear or pumping element Il is driven
through its shaft 20 by means of a drive shaft 30
which is connected to the shaft 20 through a seal
ing means which consists of a disc 3| and a disc
32, each provided Iwith tongues 33 and 34, which
ñt into slots 35 and 36 in the coupling member
31, there being a helical spring 38 encircling the
coupling member and engaging the inner sur
faces 39 and 40 of the discs tending to force -them
apart. The sealing unit is rotatably mounted in
a bore 4| in the portion I1 of the cap section I6,
. the end of this bore being provided with a finished
seat 42 against whichl the finished surface 43 ofthe disc 3| engages to form a seal, the discbeing
of a size substantially that of the bore 4| to be
65 guided in its rotation in this bore.
A sleeve 44 is inserted into the bore `4| to an
extent to retain the helical spring 38 under com
pression, and the-tongues 33 and 34 in their re~
' spective slots 35 and 36, although not sufficient to
force the discs into ñrm engagement with the
coupling member 31. The inner end 45 of this
sleeve 44 provides a finished seat against `which
the finished surface 46 of the disc 32 ‘engages to
form a seal. The dis'c 32 is also of a size to be
guided in its rotation by the bore 4|. The Sleeve
also assisted by spring 38,‘and thus effectively
prevent entrance _of air into the pump, which
might cause it to knock. Thus, this spring acts
inboth directions to assist' in preserving the seal
in the pump, while both discs are unaifected by
any of the- operating parts which is very often
detrimental to pumps of this character.
This particular pump is designed for pumping
oil a- liquid having lubricating properties and
utilization may be made of the liquid for the
lubrication of the moving parts of the pump, and
I have taken advantage of this by providing cer
tain channels to maintain a circulation of the
liquid to be pumped about the bearings for the 60
shafts 20 and 2|. In the casing, I have pro«
vided a conduit 60 which, as shown in Figure 1,
is formed in the cap section l6'ìand extends up
wardly from the y pocket at the end of shaft 2|
to connect with the pocket at the end of the
other shaft~20, and in fact, in order that I'may
provide such a conduit„,I have drilled the casing
from the outside and then blocked up theouter
end of this conduit as at 6|. I have also provided
conduits or openings 62 through the shaft 20 and
a conduit 63 through the `shaft 2|, also a con
duit in the casing from the'left hand end of the
shaft 2|! to thesuction chamber I3, which con
duit I designate 64. By this arrangement, any
liquid which seeps into bearing 24 from the gear
~ a
I2, will Work its way along this bearing dto the
pocket 65 at the end of shaft 2|, thence through
invention being deñned and limited only by the
terms of the appended claims.
, the hole 63 in the shaft 2| to the ypocket 66 at
I claim:
1. In combination, a casing provided with a
bore and a pairof opposed end seats, a shaft ro
tatably mounted in said casing, a drive shaft
the opposite end of this shaft, thence through
conduit 60 to and through the hole 62 and out
through the conduit 64 to the suction chamber
`I3 of the pump. Any liquid working into the
bearing 25 will be conveyed to thev chamber 66
through conduit 60, hole 62, vand to the suction
rotatably mounted in said casing and extending
along said bore in a direction towards the first
shaft/but terminating short of said shaft to leave
y thence through a hole 62 to this conduit 64, while
a space therebetween, and sealing drive means .10
through which said drive shaft and the other
shaft are connected, said sealing drive means
ìany liquid working ’into the bearing 22 will be
conveyed to the .pocket 68 Which directly con
15 nects with conduit 64 and thus to the suction
being interposed entirely between the ends of said
shafts and comprising a .pair of movable discs
in engagement with said seats, a coiled spring 15
chamber. Thus it will be seen that all thexbear
ings are connected to the suction side of the
pump, and any liquid leaking in from the pres
sure side will be drawn back to this suction side,
20 and there will be provided a continuous cir
between said discs for exerting pressure in oppo
site directions against said discs to force them into
sealing engagement with said seats, tongues on
conduit 64. Any liquid Working into the bearing,
23 Will be _conveyed to the end of the shaft and
culation of liquid about these bearings in the
A chamber or pocket 59 at the right hand'end
of shaft 2D is in communication with the port 6d
25 and the suction chamber, and thus there is a
vcontinual moving of any liquid from this pocket
69 towards the suction side of the pump andaway
`from the disc 3|, and the continual movement
away from this disc tends to lessen the pressure
30 on the disc, and thus this circulation assists in
relieving any pressure in the pump tending to
force any liquid out of the pump.
Further, by my means of the arrangement of
parts and circulation above mentioned, I maintain
35 a perfect axial hydrostatic balance of pressures on
either side of each of the pumping elements.
Each area is fully balanced both on the pump
ing elements or gears themselves, as well as the
pressures on the shafts 2@ and 2i, and thus this
pump will operate a far greater length of time
by reason of this balanced pressure than Where
the pressure is greater on one side of the pump
element than‘on the other, forcing it towards
some surface which mustreceive the thrust com
municated to it.
Another feature of the present construction
is that by the use of the same gears and the same
castings, I may provide a pump which. may be ar-I
ranged to run in a right or left hand direction,
50 although the chosen direction >must be deter
mined before the pump is finished, as I must of
necessity place the bore Sii on one side or the
other„depending upon the direction the pump is
to be run; for instance, in Figure 2, the suction
conduit is said to be 2t and the bore @il must
connect the bearing 22 with the suction side of
the pump, thus if I desire to change the direc
tion of rotation of the pump elements, it will be
necessary for me to connect this bore 6d with
60 the opposite conduit 2ï, but as this is merely a
drilling operation on the opposite side of the cap
member, the identical casings may be used re
gardless of the direction of rotation of the pump.
I also may optionally provide a suction and
pressure conduits in the cap section i6, as I have
illustrated' in Figure 5, instead of in the cap
sectionv I5.
Thus I may select from several of
, optional forms of construction without any‘ma- '
70 terial changes of construction.
said discs, and a coupling member having slots -to
receive said tongues on the discs and located with
in and axially of said spring for connecting said
discs for the transmission of rotation from one to
the other.
2. In combination with a casing provided with
an elongated cylindricalI bore having a pair of 25
opposed seats, of a shaft rotatably mounted in
said casing and provided with a tongue extending
in said bore,`a drive shaft having a tongue and
rotatably mounted in said bore, said drive shaft
extending along the bore of said casing in a 30
direction towards the first shaft but terminat
ing short of said shaft to leave a space therebe
tween, and sealing drive means through which
said drive shaft and the other shaft are connected
for rotation, said sealing drive means being an 35
independent unit entirely disposed between the
ends of said shafts and comprising a pair of discs
in engagement with said seats and of such size
as to be guided in rotation by said bore, a helical
spring mounted between said discs and axially
thereof for exerting pressure in opposite direc
tions against said discs to force them against
said seats, tongues on said discs, and a coupling
member having slots to receive the tongues of
said discs, said member being axially located with
in said spring for connecting said discs for the
transmission of rotation from one to the other,
said discs having outwardly facing slots to receive
the tongues provided on said shafts for the trans
mission of rotation from one'shaft to another.
.3. The combination with a casing having an
elongated cylindrical bore therein within which
is contained a pair of opposed annular seating
surfaces, of a shaft rotatably mounted in said cas
ing and extending into said bore, a drive shaft 551
in axial alignment with said first shaft,‘said drive
shaft being rotatably mounted in said casing and
extending inwardly along said bore towards the
first shaft but spaced therefrom, and sealing drive
means within said casing in axial alignment with 60
said shafts and interposed between the ends of the
lati. er for transmitting rotary motion,.said sealing
drive means comprising a pair of longitudinally
movable discs having tongue and groove driving
connection with the ends of said shafts and be 65
tween which said discs'are solely movable forv
longitudinal movement, a coupling member hav
ing tongue and groove driving ‘connection with
said discs and co-axial therewith,.and a coiled
spring surrounding said coupling and interposed 70
The foregoing description is directed solely
towards the construction illustrated, but 'I de
between the inner end faces of said discs for con
sire it to be understoodv that I reserve the
to move them in opposite directions and into seal
stantly exerting endwise pressure upon said discs
privilege of resorting _to all the mechanical îing engagement With the said casing seats.
changes tò which the device is susceptible. the
4. In a device of the character described, the 75
4 n
combination with a casing having an elongated _ interposed betwen the ends of the same for trans-v
cylindrical bore therein the inner end wall of mitting' rotary motion, said discs being of such
which is provided with an annular seating surface
and a shaft opening, of a shaft extending through
said opening into said bore and terminating close
to said seating surface, a sleeve within said bore
and having an end seating surface thereon, a drive
shaft journaled in said sleeve and in axial align
ment with said ñrst shaft, said drive slîaft ex
tending inwardly along -said borel towards said
ñrst shaft but spaced therefrom, and a sealing
drive device within said bore and comprising a
pair of spaced longitudinally movable disc mem
bers having a coupling sleeve interposed there
between, said drive device being arranged in
axial alignment with said shafts and entirely
size as to be guided by the bore in their rotation
therein, said discs having/a sealing surface on
their outer ends, one- of which is adapted to
engage the seating surface of the inner wall of
said bore and the other to engage that on the end
`of said sleeve, a coiled spring surrounding said
coupling and interposed between the inner end
fa es of said discs to exert end-wise pressure for 10
fo cing the discs apart and in sealing engagement
with said seating surfaces, said discs having ton
gue 'and groove driving connection with said
coupling and said shafts.>
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