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“My 5, 11949,
J. P. JQHNSON
2,475,391
ROTARY MOVABLE ‘ABUTMENTI PUMP
Filed May 3, 1945
INVENTOR.
JAMES EJO HNSON
ATTORNEYS
2,475,391
Patented July 5, 1949
UNITED STATES PATENT OFFICE
2,475,391
ROTARY MOVABLE ABUTMENT PUMP
James P. Johnson, Shaker Heights, Ohio
Application May 3, 1945, Serial No. 591,684
4 Claims. (Cl. 103—123)
1
This invention relates as indicated to pumps
and more particularly to the type of pump em
ploying a lobed rotor and radially extending
blades which engage the periphery of the rotor
and divide the space about the rotor into sepa
rate pumping chambers.
In its more speci?c embodiments, the present
2
the motor 2. The rotor 5 extends through a gland
generally indicated at 1 and at its right-hand
end as viewed in Fig. 1 carries a rotor head 8, the
cross-sectional form of which is most clearly illus
trated in Figs. 2 to 4. As illustrated, the contour
of the rotor head 8 is non-circular and prefer
ably of form such that the sum of the lengths
invention is an improvement in the type of pump
of any two diametrically opposed radii is a con
construction illustrated. for example in my co
stant.
The rotor head 8 is positioned in a bore 9 in
the forward end of the housing 1. The bore 9
is substantially circular in its cross~section, i. e.
cylindrical in form. A stator member Ill which is
vide a pump of the character described in which
generally annular in form is positioned in the
the blades are balanced so as to reduce the rate
of wear in the pump while at the same time in 15 bore 9 and sub-divides such bore into an inner
cavity i l and an outer cavity l2.
no way interfering with the eiiicicncy of the op
Mounted in radially extending slots in the
eration of the pump.
stator member In are blades H! which at their
Other objects of the invention will appear as
inner ends bear against the lobed rotor 8.
the description proceeds.
The blades l3 are resiliently maintained in en
To the accomplishment of the foregoing and 20
gagement with the rotor t by means of a solid
related ends, said invention then comprises the
spring annulus M which as formed may be a true
features hereinafter fully described and particu
circle having an inside diameter slightly less than
larly pointed. out in the claims, the following de
the distance across the blades 13 so that by
scription and the annexed drawings setting forth
in detail certain illustrative embodiments of the 25 springing this annulus M slightly out of round
it may be placed over the ends of the blades and
invention, these being indicative, however, of but
thus resiliently urge the latter inwardly against
a few of the various ways in which the principle
the rotor.
of the invention may be employed.
As previously indicated, the blades l3 divide the
In said annexed drawings:
pump into two pumping zones. The inlet pas
Fig. 1 is a section view of a complete pump of
sage H‘: in the body I and leading from one of the
the character to which my invention relates;
bosses in the head 3 extends byv means of branch
Fig. 2 is a transverse section view drawn to an
ducts Hi to openings I‘! by which the ?uid is sup
enlarged scale of the structure illustrated in Fig. 1
plied to the pump. The outlets for the pump are
taken on a-plane substantially indicated by the
opposite the recesses l8 and are formed in the
line 2-2;
head 2.
Figs. 3 and 4 are views similar to Fig. 2 show
The stator i B is provided with radially extend
ing, however, a slight modi?cation in the con
ing passages l9 adjacent each outlet port l8 and
struction of the blades; and
in each of such passages there is a check valve 20.
Fig. 5 is a fragmentary sectional view drawn to
In the structure illustrated in Fig. 2, the blades
an enlarged scale of a portion of the pump as ~10
l3 are chamfered at their rotor engaging ends,
illustrated in Fig. 1.
such chamfering facing the direction of rotation
Referring now more speci?cally to the drawing
of the pump.
and more especially to Fig. 1., the pump here
The operation of the pump as illustrated in
illustrated consists of a body or housing member
Fig. 1 is brie?y as follows:
generally indicated at l which is adapted to be
Fluid is admitted through the openings H and
secured as by bolts or the like to a motor such
the rotor 8 rotated in a clockwise direction as
as Z by which. the pump is driven. The housing
viewed in Fig. 2. Thus, a predetermined amount
I has a closure cap or head 3 removabiy secured
of ?uid is trapped between the rotor and the
thereto as by bolts d. In the pump illustrated
stator and forced outwardly through the dis
in Fig. 1 the cover 3 has three bosses each. of charge openings la. The ?uid in the pressure
which has a passage therein leading into the
side of the pump, therefore, has an opportunity
pump. One of such passages is an inlet or sup
to pass outwardly through the passage !9, and
ply passage and the other two are separate out
build up in the outer portion l2 of the bore 9
let passages. Since the detailed construction of
a pressure equal to the pressure in the discharge
these features of the pump are given in my above
opening
18, i. e., the same pressure which is ex~
identi?ed copending application and since they
erted against the forward faces of the blades l3.
form no part of the present invention they will
By having the forward edge of the blades cham
not be described in greater detail at this point.
fered as illustrated in Fig. 2, the blades are hy
Rotatably supported in the housing l
a rotor
5 in driving communication with the shaft 5 of 60 drostatically balanced, and the only pressure urg
pending application Serial No. 545,777, now Pat
ent No. 2,452,468 issued October 26, 1948.
It is a principal object of this invention to pro“
2,475,391
3
4
ing the blades inwardly toward and into engage
ment with the rotor is that developed by the
spring annulus I4.
of any two diametrically opposed radii is a con
stant, two diametrically opposed blades recip
rocably mounted in slots extending substantially
radially through said stator, single means re
siliently urging said blades inwardly into engage
The construction illustratedIinIFig. 4 is in every
respect identical with that illustrated in Fig. 2
except that the blades I311 are chamfered on their
ment with said rotor, said pump being provided
trailing edges. When this expedient is employed
then the radially outward hydrostatic pressure
on the blades 13 is reduced to substantially zero,
with inlet and outlet ports leading from the in
her portion of said bore at points respectively
at ‘opposite sides of each of said blades, pas
i. e. the pressure within the inlet passage, 17, 10 sages through said stator adjacent said outlet
while the pressure within the outer portion l2 of
ports and interconnecting the inner and outer
the cavity 9 is still the same pressure as that
portions of said bore.
built up in the discharge passage l8. When such
3. In a pump of the character described, the
expedient is employed then the resilient annu
combination of a housing member having a bore
lus I4 is assisted by the pressure Iinthe outer cav 15 therein, a substantially annular stator separat
ity I2 in forcing the blades into engagement with
ing said bore into inner and outer portions, a
the rotor 8.
II
I
I
I
rotor within said stator of non-circular contour
I A construction which may be conveniently ‘re
having a sliding ?t therewith at three circum
ferred to as intermediate thatI'shown in Figs. 2
ferentially and equally spaced points, such rotor
and 4_ is illustrated in Fig. 3 and inwh'ich the
contour being such that the sum of the lengths
blades I3b are
by making the
ject to radially
one-half of the
chamferedon both edgesthere~
effective area of the blades sub
outward pressure equal to about
full cross-sectionIof the blades.
Fromthe foregoing description, it will be ob
served that while only three variations have been
of any two diametrically opposed radii is a con
stant, two diametrically opposed blades recip
rocably mounted in slots extending substantially
radially through said stator, a flexible annulus
25 around said stator and in engagement with the
outer ends of said blades whereby the inner ends
of said blades are resiliently maintained in en
shown, nevertheless, by changing the degree and
direction of chamfe'ringI a wide variety ‘of varia
tions in pressure between theIIbIlaIdes and the i0
gagement with said rotor, said pump being pro
vided with inlet and outlet ports leading from
tor may be secured to_ accommodate particular 30 the inner portion of said bore at points respec
conditions which may be encountered.v
I
tively at opposite sides of each of said blades,
A pump of this character is useful not only ‘in
passages through said stator adj acent said outlet
pumping liquids but alsofor pumping IgIIaIsIes. The
ports and interconnecting the inner and outer
pump is particularly useful
pumping gases
portions of said bore.
where no lubrication can be used. By making
4. In a pump of the character described, the
the rotor of a hardImaterial such as tungsten
combination of a housing member having a bore
carbide and the blades of hard non-metallic
therein, a substantially annular stator Separat~
substance such as sapphire, the
can be run
ing said bore into inner and outer portions, a
for extremely long intervals without any lubri
rotor within said stator of non-circular contour
having a sliding ?t therewith at three circum
cation whatsoever.
_
I
I
I
I
Other modes'of applying the principle of the
invention may be employed; change being made
ferentially and equally spaced points, such rotor
as regards the details described, provided the
of any two diametrically opposed radii is a con
features stated
contour being such that the sum of the lengths
any IofII the following claims
or the equivalent of sufc’h be employed.
I
stant, two diametrically opposed blades recipro
cably mounted in slots extending substantially
radially through said stator, said pump being pro
I I
I, therefore, particularly point out and vdis
tinctly claim as my invention:_ I I I
I
I_
I
vided with inlet and outlet ports leading from the
inner portion of said bore at points respectively
I
1. In a pump of the character described, the
combination of a housing member having a bore
therein, a substantially annular stator separat
at opposite sides of each of said blades, passages
through said stator adjacent said outlet ports and
interconnecting the inner and outer portions of
ing said bore into an inner portionand an outer
continuous annular portion, a rotor within said
stator of non-circular contourhaving a sliding
?t therewith at three circumferentially and
equally spaced points, such rotor contour being
such that the sum of the lengths of any two
diametrically opposed radii is a constant,_ two
said bore, and a check valve in each of said pas
sages.
JAMES‘ P. JOHNSON.
55
REFERENCES CITED
diametrically opposed blades reciprocably mount
The following referenlces are of record in the
?le of this patent:
ed in slots extending substantially radially
through said stator into engagement with said
UNITED STATES PATENTS
rotor, said pump being provided with inlet ‘and
outlet ports leading frOmIItIi'e inner portion of
Number
said bore at points respectively at epposite sides
of each of said bladeadpa'ssagesIthrough said
stator adjacent said outlet ports and intercon
necting the inner and outer portions of said
bore.
I
65
791,919
2,015,307
2,340,196
2,373,457
Name
Date
Leidy _____________ __ June 6,
Hand ____________ __ Sept. 24,
Magrum et a1 ______ __ Jan. 25,
Chisholm _____ ______ Apr. 10,
1905
1935
1944
1945
I
2. In a pump of
character described, the
combination of aIh'o'usIIingI member having a bore
Number
therein, a substantially annular vstator separat 70
9,433
ing said bore into inner and outer portions, a
124,403
rotor within said stator of non-circular contour
having a sliding ?t therewith at three circum
ferentially and ‘equally spaced points, ‘Such rotor
contour being such that the sum of the lengths
203,978
FOREIGN PATENTS
Country
Date
Great Britain ____________ __ 1886
Switzerland ________ __ Feb. 1, 1928
Great Britain ____ __ Sept. 20, 1923
346,020
Great Britain ____________ __ 1931
673,278
France ____________ __ Oct. 7, 1929
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