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Патент USA US3095832

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July 2, 1963
R. 5. BRAND
3,095,823
POSITIVE DISPLACEMENT PUMP
Filed Aug. 14. 1961
FIG, I
2 Sheets-Sheet 1
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46
INVENTOR.
RONALD 3 BRAND
BY Jw, fa
44M“.
ATTORNEYS
July 2, 1963
‘
R. 8. BRAND
3,095,823
POSITIVE DISPLACEMENT PUMP
Filed Aug. 14, 1961
FIG. 3
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United States Patent Office
1.
3,095,823
PGSITIVE DISPLACEMENT PUMP
Ronald S. Brand, Westford Road, Eastford, Conn.
Filed Aug. 14, 1961, Ser. No. 131,213
6 Claims. (Cl. 103-117)
This invention relates to a rotary ?uid pump, and deals
more particularly with ‘a rotary pump‘ having a positive
3,095,823
Patented July 2, 1963
2
end to end abutting relationship by an oversize locat
ing bolt 18 and ?ve smaller tie bolts 20, 20 as shown in
FIGS. 1 and 2. The two end pieces 12 and 14 ‘are each
provided with cylindrical bores 22 and 24, respectively,
which bores are arranged coaxial with each other and
are of substantially the same size. The middle piece
16 is provided with a smaller diametered cylindrical bore
26 which bore passes through the center piece 16 and
is located eccentn'eally with respect to the two coaxial
The general object of this invention is to provide a 10 bores 22 and 24. The center piece 16, therefore, serves
positive displacement pump which eliminates the need
in effect as a partition or wall between the two coaxial
for reciprocating pistons, complicated valve mechanisms,
bores 22 and 24. Preferably land as shown, but not
sliding vanes or other similar parts commonly found in
necessarily, the diameter and location of the eccentric
conventional positive displacement pumps.
bore 26 is such that the surface of the'bore is at one
A further object of this invention is to provide a pump 15 point tangent with the cylindrical surfaces of the coaxial
of the foregoing character which is of a relatively sim
bores 22, 24. In the illustrated case, as shown in FIG.
ple construction, which requires only a relatively small
2, the point of tangency occurs at the lowermost point
number of parts, and which is relatively inexpensive to
of the bores, or at the six o’clock position, when the
manufacture.
housing is positioned as shown.
A still further object of this invention is to provide 20
Positioned respectively in the two coaxial bores 22 and
a pump of the foregoing character which may ‘be de
24 are two main or driving rotors 38 and 40, respectively.
signed as either a ?xed displacement or a variable dis
Each of the rotors 38 and 40‘ is cylindrical in shape and
placement pump without any basic change in the ar
has an outer cylindrical surface which is'substantially
displacement characteristic.
rangement or cooperation of the various parts thereof.
the same diameter as the diameter of the associated
A still further object of this invention is to provide a 25 bore so that the rotor sealingly closes the outer end of
pump of the foregoing character which lends itself to
the associated bore. The ?t between the rotors 38‘ and
a dual-chambered construction and wherein the cham
40 ‘and the bores 22 and 24 is, however, such that the
bers operate alternatively with one chamber ?lling while
rotors 38 and 40 are free to be rotated relative to the
the other discharges, to provide a substantially steady
housing. The driving rotor 38 has a ?at inclined end
output.
face 42 which faces inwardly toward the center piece
Other objects and advantages of the invention will be
or partition 16, and the rotor 41] has a similar inclined
apparent from the following description and from the
end face 44 which likewise faces inwardly toward the
drawings forming a part thereof.
middle piece or partition 16. The two inclined end faces
The drawings show preferred embodiments of the in
42 and 44 thus oppose each other and they are positioned
vention and such embodiments will be described, but it 35 in parallel planes. The two rotors 38‘ and 40‘ are mount
will be understood that various changes may be made
ed on a drive shaft 46 which passes axially through the
from the constructions disclosed, and that the drawings
two rotors and through the eccentric bore 26 and are
and description are not to be construed as de?ning or
angularly ?xed thereto by suitable means such as keys
48 and 50 which are received by registering slots in
40
the drive shaft and the rotors as shown in FIG. 1.
purpose.
Preferably, and as shown, but not necessarily, the
!Of the drawings:
maximum longitudinal or axial length of the cylindrical
FIG. 1 is "a vertical sectional view taken on a plane
outer surface of each main rotor is substantially the
passing through the longitudinal axis of a pump em
same as the axial length of its associated housing bore.
bodying the present invention and in which view the two
To hold the rotors 38 and 40 in axially ?xed position
main or driving rotors are positioned by the shaft so
with respect to the housing 10 each end of the housing
that the left-hand operating chamber is at maximum vol
is provided with an annular retaining member 52 which
ume while the right-hand operating chamber is at mini
is held to the housing by the bolts 18 and 20, 20 as
mum volume.
shown in FIG. 1. Each member 52 extends radially
FIG. 2 is a transverse sectional view taken on the line 50 inwardly from the associated end piece 12 or 14 and
2—2 of FIG. 1.
engages the outer end face of the associated rotor to
FIG. 3 is a horizontal sectional view taken on the
prevent the same from moving out of its associated bore,
line 3-3 of FIG. 1, but in which view the shaft has
the outer end ‘face of each rotor being ?at and dis
been rotated 90'’ clockwise, looking toward the left of
posed in a plane normal to the axis of rotation. In the
FIG. 1, so that the two main or driving rotors occupy 55 illustrated case each retaining member is also formed
positions different from that in FIG. 1 and with the
to include two legs 54, 54 for use in attaching the pump
result that the volumes of the two operating chambers
to a supporting structure although otherv means for sup
are equal.
porting the pump may be employed.
FIG. 4 is a view partly in side elevation and partly
Loosely carried by the eccentric bore 26 in the middle
in vertical section of a housing employed in a pump
piece or partition 16 is a driven rotor 56. The rotor 56
comprising a modi?cation of the present invention.
has an outer cylindrical surface of substantially the same
FIG. 5 is an end elevational view of the housing shown
‘diameter as the bore 26 so that the rotor is free to rotate
in FIG. 4.
about and reciprocate axially along its center axis which
Turning now to the drawings, and first particularly
referring to FIGS. 1, 2 and 3, the illustrated pump in 65 axis is also the axis of the eccentric bore 26. The rotor
56 has two end faces which are ?at and inclined to the
cludes a stationary housing 10. The housing 10 may be
same degree as the end faces 42 and 44 on the main
made as a single integral unit, but in the present case
rotors 38 and 40.. The two inclined end faces 58 and
is shown to be made up of two separate end pieces .12
69 are disposed in parallel planes and the length of the
‘and 14 and an intermediate piece 16-. The three pieces
12, 14 and 16 have cylindrical outer surfaces of sub 70 rotor 56 is such that the end face 58 ?atly engages the
end face 42 while the end face 60 simultaneously ?atly
stantially the same diameter and are held together in
engages the end face 44. ‘The drive shaft 46 passes
limiting the scope of the invention, the claims forming
a part of this speci?cation being relied upon for that
3,095,823
through an axial bore 62 in the rotor 56 and is not
drivingly connected therewith.
-
‘
ii
for opening and closing the ports, and such construction
is shown in the drawings.
Referring to FIG. 3 and considering speci?cally the
left-hand operating chamber 64, it will be noted that
the housing piece 12 is provided with an outlet port 68
Due to the ?at and simultaneous engagement between
the end faces of the eccentric rotor 56 and the inclined
end faces of the coaxial‘ rotors 38 and 40 the rotor 56
and an inlet port '76 comprising circular holes drilled
is driven in rotation about its central axis, the axis of
through the housing piece 12. Actually, either the port
the bore 26, when the rotors 38 and 40am rotated by
68 or the port 7% may be the outlet port and the other
the ‘shaft 46. vAt the same time, this rotation of the
the inlet port depending on the direction in which the
eccentric rotor 56 by the coaxial rotors 38 and 40' will
also. cause the eccentric rotor to be reciprocated axially 10 shaft 46 is rotated, but for the direction of rotation
indicated by the arrow A, or clockwise rotation looking
relative to the middle piece or partition 16.
toward the left, the port 68 is the outlet port and the port
The fact that the rotor 56 rotates about and recipro
76 is the inlet port. The inlet port 76 is threaded at its
cates along its axis can be observed from FIG. 1 by
outer end to receive a pipe or conduit 72 which may be
the rotor 56 is moved as far as it will go toward the 15 connected to a source of ?uid for delivering ?uid'to the
noting that with the shaftv 46 in the position shown,
right. Now, if the shaft ‘46 is moved 180° in either
direction relative to the housing 10, the rotor 56 will be
moved toward the left as far as it will go due to a change
pump.
Likewise, the outlet port 68 is threaded at its
outer end to receive a pipe or conduit- 74 which may
be connected to a suitable ?uid receiver. The inner end
of each of'the ports 68 and '70 opens adjacent the surface
in the direction of the inclination of the two inclined end
faces 42 and 4-4. To allow for this reciprocation of the 20 of the bore 22 and the two ports are located diametrically
opposite from each other along a line which passes through
rotor 56 and the change in the direction of inclination
the axis of coaxial bores 22 and 24 and which line is
of the end faces 42 and 44' it will be obvious that the
perpendicular to the plane passing through both the
rotor 56 will have to rotate 180° about its axis in the
axis of the coaxial bores and the axis of the eccentric
same direction as that in which the rotors 38 and 40 are
In FIG. 3 the rotors 38 and 4%) are shown 25 bore 26. In other words, if the plane passing through
the axis of the coaxial bores and the axis of the eccentric
rotated 90° from the positions occupied in FIG. 1 and
bore is considered a zero reference, the out et port 63
in FIG. 3 it will be noted that the rotor 56 is located
rotated.
is located 90° from this plane in one direction about
the axis of the coaxial bores while the inlet port 79 is
Referring to FIGS. 1 and 3, it will also be noted that
the inclined end face 42 of the rotor 38, the surface 30 located 90° from this plane in the other direction about
the axis of the coaxial bores. The two ports 68 and 70
of the bore 22, the outer cylindrical surface of the rotor
are also so located axially of the housing so that the
56 and the associated end or wall surface of the parti
inner
ends of both will be closed by the outer cylin
tion 16 collectively de?ne an operating chamber 64. It
drical surface of the rotor 38 when the rotor is in a
will also be observed that the inclined end face 44 of the
rotor 49, the surface of the bore 24, the outer cylin 35 position corresponding to either the maximum or mini
mum volume of the chamber 64. For example, in FIG. 1
drical surface of the rotor 56 and the ‘associated end
the rotor 33 is shown in the position corresponding to
surface of the partition 16 likewise de?ne another similar
the maximum volume of the chamber 64. ‘In this posi
operating chamber 66. The volumes of these two oper
tion it will be noted that the outer cylindrical surface of
ating chambers are, in turn, cyclically varied by 'the
the rotor 38 entirely closes the port 63, and since the port
40
reciprocation of the rotor 56. That is, the reciprocation
midway between its extreme right and left end positions.
of the rotor 56 causes the rotor to alternatively move into
and out of the partition 16 with respect to each chamber
to occupy more or- less of the free volume of the chamber.
For example, considering the operating chamber 64, as
7%) is diametrically opposite from the port 68 it also
entirely closes the port 76. As soon as the rotor is
rotated in the direction of the arrow A from the posi
tion shown in FIG. 1, the port 68 will be at least par
the rotor 56 moves to the right it moves into the parti 45 tially opened to permit the ?ow of fluid out of the chamber
64 as the volume of the latter decreases.
‘
tion 16 and occupies less of the chamber 64 so that
FIG. 3 shows the‘ position of the rotor 38 after it is
the volume of the chamber is increased. Likewise, as
rotated 90° from the‘ direction shown in FIG. 1 and
it moves to'the left it extends out of the partition 16,
from this ?gure it will be noted that at this time the outlet
occupying more of the chamber 64 and therefore decreas
ing the eifective volume of said latter chamber. As the 50 port 68 is fully opened while the inlet port 70 remains
closed. Through’ the next 90° of rotation the outlet port
rotor 38 is moved through one complete revolution the
68 closes and the inlet port 70 again remains closed so
'rotor 56 is driven through one complete cycle of recipro
that after the rotor 38 is rotated a full 180° from the posi
cation so that the volume of the-chamber 64 is varied
I cyclically between its maximum and minimum volumes. 55 tion shown in FIG. 1 both of the ports 68 and 76 will
once again be closed. Continued rotation of the rotor
The same general effectrholds true for the operating
will then cause the inlet port 79 to open while‘ the outlet
chamber 66 except that the-volume of the chamber 66
port 68 remains closed. As the rotor rotates from the
increases while the volume of‘ the chamber 64 decreases
180° position back to the position shown in HG. 1 the
and decreases while the volume of the chamber 64
inlet port 70 is ?rst fully opened and then returned to
increases.
60 its fully closed position. From this it will be seen that
This cyclic variation in the volume of the chambers 64
the outlet port is opened, or at least partly opened, while
-and 66 is used to effect a pumping action by providing
the volume of-the chamber 64 is decreasing, with the inlet
each of the’ chambers 64 and 66 with suitable inlet and
port 7%} being at the same time held closed, and that the
outlet port means for admitting ?uid from a source to
outlet port 68 is held closed and the inlet port 70 opened,
the chamber while the volume thereof is increasing and 65 or at least partially opened, to permit the ?ow of ?uid into
for discharging fluid to a receiver while the volume is
the chamber while the volume thereof is increasing. This
decreasing. The inlet and outlet ports for each chamber
opening and closing of the ports 68 and 7% therefore co
operates with the increasing and decreasing nature of the
communicate with the chamber and suitable'valve means
volume 64 to cause a pumping action, the ?uid ?rst ?ow
are provided for closing and opening the ports in timed
relation with the rotation of the driving rotors so that 70 ing into the chamber 64 through the inlet port 79 and
then being discharged through the outlet port 68.
the ports are alternately opened and closed in proper
The arrangement of ports for the chamber 66 is sub
timedv sequence to achieve a pumping action. Various
stantially the same as that for the chamber 64. That is,
suitable inlet and outlet port means may be employed,
for the direction of rotation of the shaft 66 shown by
but preferably the construction is such that the outer
cylindrical surfaces of the driving rotors serve as valves 75 the arrow A in FIG. 1, the chamber 66 has an inlet port
3,095,823
5
.
.
6
"78 and an outlet port '76, which ports are formed by
openings in the housing piece 14 and which ports com
the ?ange portions 96 and 598. For the purpose of effect
municate respectively with supply and discharge pipes
ing movement of the member 164, a stem 108 is con
or conduits 82 and 89. The ports 76 and 78 are located
diametrically opposite from one another in the same man
ner as the ports 68 and 70 and are so located axially of
nected thereto which stem may, in turn, be operated by
any suitable positioning means. In ‘FIG. 5 the member
164 is shown moved to its lowermost position relative to
the housing pieces 84 and 86. At this position the bore
106 has maximum eccentricity relative to the axis of the
the housing piece 14 as to be alternately opened and
closed in timed relation to the rotation of the shaft 46
by the outer surface of the driving rotor 40 in the same
manner as the ports 68 and 70 are opened and closed by
the driving rotor 38. The ports 76 and 73, therefore,
cooperate with the operating chamber 66 to provide a
.
the guide chamber formed by the ?anges 92 and 94 and
coaxial bores 88 and 90. As the stem 108 is moved up
10 wardly the member 104 is likewise moved upwardly and
pumping action.
The operation of the pump shown in FIGS. 1, 2 and 3
is such that the operating chambers 64 and 66 operate 15
in opposition to one another so that when the volume of
one chamber is increasing the volume of the other cham
ber is decreasing. Accordingly, when one chamber is ?ll-,
ing the other chamber is discharging and the rate of dis
the bore 166 is moved closer to axial alignment with the
axes of the bores 83 and 90. As the eccentricity of the
bore 166 decreases the displacement of the pump likewise
decreases, and when the bore 106 is truly axially aligned
with the bores 88 and 90 the pump will have zero dis
placement.
The invention claimed is:
1. A, ?uid pump comprising a housing having a cylin
drical bore, a ?rst cylindrical rotor of substantially the
charge is substantially uniform throughout the discharge
same diameter as said bore rotatively supported at a ?xed
portion of the operating cycle of each chamber. As soon 20 axial position in said bore in coaxial relationship there
as one chamber completes its discharge the other operat
with and sealingly closing one end thereof, said rotor hav
ing chamber begins to discharge. Thus, by connecting
ing
a ?at end face facing the other end of said bore and
the two outlet conduits 74 and 80 to a single line or re
which end face is inclined relative to the common axis of
ceiver, a substantially continuous and steady output may 25 said bore and said ?rst rotor, wall means ?xed relative
be obtained from the pump.
to said housing and closing said other end ‘of said bore, a
Although the pump shown in FIGS. 1, 2 and 3 is a dual
second cylindrical rotor of smaller diameter than said bore
chambered pump, various features of the invention may
loosely mounted in said wall means with its axis ar
be ‘applied as well to a single chambered pump, if de
sired. For example, referring to FIGS. 1 and 3, and con 30 ranged eccentric to said common axis of said bore and
said ?rst rotor, said second rotor being both rotatable
sidering the operating chamber 64, it will be noted that as
about and reciprocable along said eccentric axis relative
far as this chamber is concerned the purpose of the driv
to said housing and also extending beyond said wall
ing rotor 46 is to urge the eccentric rotor 56 toward the
means toward said ?rst rotor and having an inclined ?at
driving rotor 38 so that the end face 58 of the eccentric
rotor is maintained in ?at engagement with the end face 35 end face which ?atly engages said inclined end faceof
said ?rst rotor, said inclined face of said ?rst rotor, the
42 of the driving rotor. Therefore, if it is desired to
surface of said housing bore, the surface of said wall
build only a single chambered pump suitable means dif
means, and the outer cylindrical surface of said second
ferent from the driving rotor 40 may be used to urge the
rotor collectively de?ning an operating chamber, means
rotor 56 into engagement with the driving rotor 38.
‘for urging sad second rotor toward said ?rst rotor so
The pump shown in FIGS. 1, 2 and 3 has a ?xed dis
that said two inclined faces are maintained in ?at en
placement, a given volume of ?uid being discharged with
gagement with each other and so that said second rotor
each complete rotation of the shaft 46. The eccentricity
is accordingly rotated and reciprocated relative to said
of the rotor 56 relative to the axis of the coaxial bores
housing into and out of said wall means as said ?rst rotor
22 and 24, among other things, determines the displace
ment of the pump, and therefore a variable displacement 45 is rotated, the reciprocationv of said second rotor into
and out of said wall means serving to cyclically vary the
pump may be provided for by constructing the housing
volume of said operating chamber, inlet means adapted
of the pump in such a manner as to'permit‘the center
for connection to a source of ?ud and operable to permit
piece to be moved radially to shift the eccentricity of its
?uid to pass from said source to said operating chamber
bore. A housing for such a variable displacement pump
is shown, for example, in FIGS. 4 and 5. Referring to 50 while the volume of the latter is increasing and to pre
vent ?uid from passing in the reverse direction while said
these ?gures, the housing there shown consists of two end
volume is decreasing, and outlet means adapted for con—
pieces 84 and 86 provided with coaxial bores 88 and 90
respectively, which bores serve to receive driving rotors
such as the rotors 38 and lit) in the pump of FIGS. 1, 2
nection to a receiver and operable to permit ?uid to
lar ?anges 92 and 94, respectively.
The two ?anges 92 and 94 have axially extending por
tions §6 and 98 formed along each of their longer edges
creasing.
pass from said operating chamber to said receiver while
and 3. At their opposed inner ends the housing pieces 55 said volume is decreasing and to prevent said ?uid from
passing in the reverse direction when said volume is in
84 and 86 are provided with radially extending rectangu
2. A pump as de?ned in claim 1 further characterized
by said inlet means comprising an inlet port formed in
and the two portions 96 and 98 on each side of the hous 60 said housing and having an inner end which opens adja
cent the surface of said housing bore and which inner
ing engage one another so that the ?anges 92 and 94
are held in axially spaced relationship. The two housing
pieces 84 and 86 are, in turn, held in connected relation
ship by two connecting members ltit) and W2 which ex
tend between the ?anges 92 and 94 shown in FIGS. 4
and 5 and which are held thereto by suitable fastening
means. The two ?anges 92 and 94 together with their
axially extending portions 96 and 98 de?ne a box-shaped
guide chamber for receiving-a correspondingly shaped
middle housing piece or partition 104. The partition 164,
except for being box-shaped rather than cylindrical, is
generally similar to the intermediate piece 16 of the pump
of ‘FIGS. 1, 2 and 3 and is provided with a bore 106 for
receiving a driven rotor such as the rotor 56. Unlike the
end is so located as to be in communication with said
operating chamber while said operating chamber volume
is increasing and closed by the outer surface of said ?rst
rotor while said operating chamber volume is decreasing,
and by said outlet means comprising an outlet port
formed in said housing and having an inner end which
opens adjacent the surface of said housing bore and
which latter inner end is so located'as to be in communi~
cation with said operating chamber while said operating
chamber volume is decreasing and closed by the outer
surface of said rotor while said operating chamber vol
ume is increasing.
3. A ?uid pump comprising a housing having two co
housing piece 16, however, the member 104 is movable in 75 axial cylindrical bores separated by a partition having
a smaller diametered cylindrical bore extending between
3,095,823
7
n
L).
said two coaxial bores and eccentrically arranged rela
tive thereto, a shaft extending through said housing con
centrically with said two coaxial bores, two cylindrical
driving rotors ?xed to said shaft each of which rotors
is disposed in a respective one of said coaxial bores and
has a diameter substantially equal to the diameter of the
associated bone so as to sealingly close said bore, said
two rotors having opposed faces disposed in parallel
associated coaxial bore which is opened and closed by
the cylindrical outer surface of the associated driving
rotor as the latter is rotated, the inner end of the inlet port
of each chamber being so located as to be open when the
volume of the associated operating chamber is increasing
and closed when the volume is decreasing and the inner
end of the outlet port of each chamber being so located
as to be closed when the volume of the ‘associated operat
ing chamber is increasing and open when the volume is
planes which planes are inclined relative to the axis of
said shaft, and a third cylindrical driven rotor received 10 decreasing.
6. A fluid pump comprising a housing having two c0
by said eccentric partition bore and having a diameter
axial
cylindrical bores separated by a partition having a
substantially equal to that of said bore so that said parti
smaller diametered cylindrical bore extending between
ti'on supports the same for rotation about and reciproca
said two coaxial bores and eccentrically arranged rela
tion along its longitudinal axis, said third rotor having
tive thereto, a shaft extending through said housing con
15
an axial bore through which said shaft loosely passes
centrically withsaid two coaxial bores, two cylindrical
and having two inclined and parallel end faces which re
driving rotors ?xed to said shaft each of which rotors is
spectively ?atly engage the opposingend vfaces of said
disposed in a respective one of said coaxial bores and has
a diameter substantially equal to the diameter of the asso
reciprocated along its longitudinal- axis as saidtwo rotor-s
ciated bore so ‘as to sealingly close said bore, said two
are rotated by said shaft, the inner- surface of each of 20 rotors having opposed faces disposed in parallel planes
two rotors so that said third rotor is rotated about and
said coaxial bores, the inclined‘ end face of the associated
which planes are inclined relative to the axis of said shaft,
driving rotor, the associated surface of said partition,
and a third cylindrical driven rotor received by said eccen
and ‘the outer cylindrical surface of that portion of said
tric partition bore and having a diameter substantially
driven rotor which extends beyond said partition and
equal to that of said bore so that said partition supports
toward said latter driving. rotor de?ning’ an operating 2-5 the same for rotation ‘about and reciprocation along its
chamber the volume of which varies cyclically as said
longitudinal axis, said third rotor having an axial bore
driven- rotor reciprocates, and fluid inlet and outlet means
through which said shaft loosely passes and having two
communicating with each of said opera-ting chambers
inclined and parallel end faces which respectively ?atly
and including valve means operable in timed relation to
engage the opposing end faces of said two rotors so that
the rotation of said shaft toalternatively permit and 30I said third rotor is rotated about and reciprocated along
prevent the passage of ?uid into and out of- said operating
its longitudinal axis as said two rotors are rotated by said
chambers in such‘ a manner as to achieve a pumping ac
shaft, the inner surface of each of said coaxial bores, the
inclined end face of the associated driving rotor, the asso
v 4. A pump as de?ned in claim 3 further characterized
ciated surface of said partition, and the outer cylindrical
by said partition being separate from the remainder of 35 surface of that portion of said driven rotor which extends
said'honsing, and means on said housingsupporting said
beyond said partition and toward said latter driving rotor
partition for movement radially with respect to said co,
‘de?ning an operating chamber the volume of vwhich varies
axial bores to change the eccentricity of said driven rotor
cyclically ‘as said driven rotor 'reciprocates, and means
relative to said coaxial bores and to thereby vary the dis 40 de?ning an inlet and an outlet port for each of said operat
ing chambers each of which ports passes through said
placement of said pump.
.
~
5. A ?uid pump comprising. a housing having two co
housing and has an inner end adjacent the surface of the
axial cylindrical bores separated by a partition having a
iassociated coaxial bore which is opened and closed by the
smaller diametered cylindrical bore extending between
cylindrical outer surface of the associated driving rotor
said two coaxial bores and eccentrically ‘arranged rela 45 ‘as the latter is rotated, the inlet and outlet ports of each
chamber being located substantially diametrically op
tive thereto, a shaft extending through said housing con
oentricallywith said two coaxial bores, two cylindrical
posite from each other along a line passing through the
driving rotors fixed to said shaft each of which rotors is
axis of said coaxial bores and ‘perpendicular to a plane
disposed in a respective one of said coaxial bores and has
passing through both said axis of said coaxial bores and
a diameter substantially equal to the diameter of the asso 50 the axis of-said eccentric bore and being further so lo
cated axially of said housing that when the associated driv~
ciated bore so as to sealingly close said bore, said two
tion.
'
rotors having opopsed faces disposed in parallel planes
ing rotor is at either the angular position corresponding
to maximum chamber volume or the angular position
corresponding to minimum chamber volume both said
and a third cylindrical driven rotor received by said ec
centric-partition bore and having a diameter substantially 55 ports will be closed and that when said rotor is some angu
lar distance from either of said two positions one or the
equal to that of said bore so that said partition supports
the same for rotation about and reciprocation ‘along its
other ofsaid ports will be open.
longitudinal axis, said third rotor having an axial bore
through which said shaft loosely passes and having‘ two
References Cited inthe ?le of this patent
‘which planes are inclined relative to the axis ‘of said shaft,
inclined and parallel end faces which respectively ?atly
engage the opposing end faces of said two rotors so that
so’
said third rotor is rotated ‘about. and reciprocated along its
longitudinal axis as said two rotors are rotated by said
shaft, the inner surface of eachof said coaxial bores, the
inclined end face of the associated driving rotor, the asso
ciated surface of said partition, and the outer cylindrical
UNITED STATES PATENTS
1,404,625
1,833,501
2,858,770
Marquet _____________ __ J an. 24, 1922
Schick ______________ .__ Nov. 24, 193-1
Reynolds _____________ _._ Nov. 4, 1958
84,188
Norway _____________ __ Aug. 30,- 1954
65
surface of that portion of said driven rotor which extends
beyond said partition and toward said latter driving rotor
de?ning an operating chamber the volume of which varies
cyclically as said driven rotorreciprocates, and means
de?ning an inlet and an outlet port for each of said operat 70
ing chambers‘ each of which ports passes through said
housing and has an‘ inner end adjacent the surface of the
FOREIGN PATENTS
95,139
292,384
372,858
496,911
606,506
Germany _____________ __ Dec. 4,
Italy ________________ __ Jan. 16,
Great Britain __________ __ May 19,
Belgium _____________ _.. July 31,
Great Britain _________ __ Aug. 16,
1897‘
1932
1932
1950
v1948
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