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Патент USA US3065716

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Nov. 27, 1962
G. "r. SHOOSMITH
3,065,706
VARIABLE-CAPACITY ROTARY PUMPS
Filed March 17, 1961
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Nov. 27, 1962
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‘Filed March 1'7. 1961
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G. -r. SHOOSMITH
3,065,706
VARIABLE-CAPACITY ROTARY PUMPS
3 Sheets-Sheet 3
InventorI
I ‘57917 iwo-owwwt.
By
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3,65,7d6
Patented Nov. 2?, 1952
2
3,065,706
Guy Taite Shoosmith, St. Mary Bourne, England, as
signor to Plenty and Son Limited, Newbury, England
VARIABLE-CAPACITY ROTARY PUMPS
Filed Mar. 17, 1961, Ser. No. 96,599
Claims priority, application Great Britain Mar. 18, 1960
2 Claims. (Cl. 103—120)
This invention relates to variable-capacity rotary pumps,
faces 16 formed internally on a rotor 18 which surrounds
the shaft, and the rotor 18 is supported for rotation in a
block it) mounted for limited sliding movement in a ver
tical direction within the pump casing 10‘. Movement
of the block 2i) as a result of rotation of the control
wheel 21 causes the axis of the rotor 13 to be displaced
relatively to the axis of the shaft 12, with the result that
the capacity of the pump is varied. Liquid enters the
pump through the suction passage 22 and leaves it through
particularly pumps of the sliding vane type.
l0 the delivery passage 24%, the sliding block being provided
In a number of prior British Patents———for example,
with an inlet opening 26 and‘ a delivery opening 28 to
Patent No. 689,313—we have described variable-capacity
allow this through-flow of liquid.
rotary pumps which comprise a pump casing containing
It has been found that, in certain circumstances, it is
a rotor shaft provided with slots which receive a number
important to prevent liquid which is passing through the
of sliding vanes. The outer ends of these sliding vanes 15 interior of the sliding block 24} from leaking into the
bear on ?at surfaces formed internally on a rotor which
spaces 3d and 32 lying above and below it. Accord
surrounds the shaft, and the rotor is supported for rota
ingly, the flat surface on each of the four vertical sides
tion in a block mounted for limited sliding movement
of the sliding block has an annular recess 34, 36, 38, 40
within the pump casing. Movement of the ‘block causes
which receives a rubber O-ring 42 arranged to make seal
the axis of the rotor to be displaced relatively to the 20 ing contact with the flat mating surface of the pump
axis of the shaft, with the result that the capacity of the
casing. The annular recesses 38 and 42 in two opposite
pump is varied.
,
sides of the sliding block are so formed as to surround
The present invention is particularly applicable to
openings 44 in those sides which receive the rotor 18
pumps of the above-mentioned construction, and has as
and the rotor shaft 12, while the annular recesses 34 and
its aim the provision of means which ensure that liquid 25 36 in the other two sides of the sliding block surround
being passed through the pump cannot leak into the
the inlet and outlet openings 26 and 28 of the block.
spaces above and below the sliding block.
According to the invention, a variable-capacity rotary
If desired, the four annular recesses 34, 36, 38, 40 can
be formed in the inner surfaces of the pump casing It)
pump comprises a rotor carried by a block which is ar
instead of in the sides of the sliding block 20.
ranged for sliding movement within the pump casing so 30
A modi?cation to the sliding block of the pump shown
that the capacity of the pump can be varied, in which
in FIGURES l—3 is illustrated‘ in FIGURES 4 and 5.
one or more liquid-tight seals are provided between mat
The main diiference between the two blocks is that the
ing surfaces on the sliding block and the pump casing so
block 2% shown in FIGURE 4 has two concentrically
that the spaces at either end or on opposite sides of the
arranged annular recesses and O-rings in each side wall
sliding block are sealed off from the interior of the block. 35 instead of only one such recess. The two annular recesses
The invention is particularly advantageous when it is
36, 3'7 and 38, 39 on each side wall of the sliding block
incorporated into a pump which is intended to handle
are preferably spaced about 1 inch apart, and the thin
very viscous liquids such as bitumen or cream. Were
annular space 46 (see FIGURE 5) formed between the
such liquids to leak from the pumping chamber into the
O-rings located in the recesses is ?lled with grease which
spaces ?anking the sliding block, the sliding block would
is forced through passageways 43 in the pump casing.
become very di?icult to move for the purpose of varying
This arrangement not only ensures that liquid passing
the capacity of the pump. Another bene?cial applica
through the interior of the block cannot leak into the
tion of the invention is to pumps for handling foodstu?s
spaces 3%) and 32 above and below the sliding block, but
which are liable to go bad. In such cases it is important
also allows those spaces to be supplied with hydraulic
to prevent the egress of foodstuffs from the interior of 45 liquid for the purpose of varying the position of the slid
the sliding block, and the present invention provides a
ing block within the pump casing without there being any
pump which meets this requirement.
risk of the two liquids contaminating each other.
In order that the invention may be thoroughly under
The pump shown in FIGURES 6-8 is similar to that
stood, three different pumps in accordance with it will
shown in FIGURES 1—3, but in this case the possibility
now be described, by way of example, with reference to 50 of leakage from the interior of the sliding block 20 is
the accompanying drawings, in which:
reduced still further by making the inlet and outlet pas
FIGURE 1 is a vertical section through one form of
sages of the pump integral with the sliding block. The
pump;
sliding block 20 is therefore provided with two hollow
FIGURE 2 is a horizontal section through the same
arms 50 and 52 which project through openings 54 and
55 56 in two opposite sides of the pump casing 10. This
pump;
FIGURE 3 is a perspective view of part of the pump
construction makes it unnecessary to provide O-rings
shown in FIGURES 1 and 2;
in the sliding block surrounding the inlet and outlet
FIGURE 4 is a perspective view illustrating a modi
passages, but O-rings 42'surrounding the rotor 18 and
?cation to the pump shown in FIGURES 1-3;
the rotor shaft 12 are provided in the same way as
FIGURE 5 is a section through a detail of the pump 60 in the pump shown in FIGURES 1-3. The outwardly
component shown in FIGURE 4;
extending hollow arms 50 and 52 forming part of the
FIGURE 6 is a vertical section through another form
sliding block 26‘ thus move up and down with the main
of pump;
body of the sliding block during adjustment of the
FIGURE 7 is a horizontal section through the pump
capacity of the pump, and the connecting pipes 58 and
shown in FIGURE 6; and
65 6!) ‘attached to the outer ends of the hollow arms must
FIGURE 8 is a perspective view of part of the pump
therefore be su?iciently ?exible to allow such movement
shown in FIGURES 6 and 7.
,
The pump shown in FIGURES 1—3 is a variable-capac
ity rotary pump of the sliding vane type which comprises
of the arms to take place.
Although the invention has been described above in
connection with a certain construction of pump, it is
a pump casing 143 containing a rotor shaft 12 provided 70 not restricted to that form of pump. It is, in fact,
with slots which receive a number of sliding vanes 14.
applicable generally to those variable-capacity rotary
The outer ends of these sliding vanes bear on ?at sur
pumps which have a rotor carried by a block arranged
3,065,706
4
3
hollow four-sided pump casing, a pair of openings in
two opposite sides of said pump casing, a hollow four
sided sliding block having openings in the four sides
thereof slidably mounted within said pump casing, a pair
of hollow arms extending from two of said openings in
opposite sides of said sliding block through said open
ings in said pump casing and communicating with the
for sliding or other movement, and which have spaces
above and below or an opposite sides of the movable
block.
-
I claim:
1. A variable-capacity rotary pump comprising a
hollow pump casing, a suction passage and a delivery
passage in said pump casing, a hollow four-sided sliding
block slidably mounted within said pump casing, a rotor
interior of said sliding block to form a liquid inlet
passage and a liquid delivery passage respectively, a
said rotor means mechanically connected to said sliding 10 rotor rotatable within said pump casing, shaft means to
rotatable within said pump casing, shaft means to rotate
rotate said rotor projecting through the remaining two
of said openings in the sliding block, means mechanically
connected to said sliding block and arranged externally
of said pump casing on an upper portion thereof for
block and arranged externally of said pump casing on
an upper portion thereof for slidably moving said slid
ing block to alter the relative positions of said sliding
block and said rotor shaft, a pair of closed chambers
slidably moving said sliding block to alter the relative
positions of said sliding block and said rotor shaft, a
pair of closed chambers ?anking said sliding block within
said pump casing, each of said closed chambers being
?anking said sliding block within said pump casing,
each of said closed chambers being bounded on one
side by the outer surfaces of said sliding block and the
inner surface portions of the pump casing, portions of
said pump casing and said sliding block having flat
mating surfaces on four sides of said Sliding block
cooperatively arranged to reduce to sliding clearances
bounded on one side by the outer surfaces of said sliding
block and the inner surface portions of the pump casing
portions of said pump casing and said sliding block
having ?at mating surfaces on vfour sides of said slid
ing block cooperatively arranged to reduce to sliding
clearance only any communication between said closed
only any communication between said closed chambers
and said suction passage, said delivery passage and the
interior of said hollow sliding block, a ?rst pair of
liquid-tight sealing rings located between said mating
25
chambers and said sliding block interior, and a pair of
surfaces and surrounding a liquid inlet opening and a
liquid-tight sealing rings located between said mating
liquid delivery opening on two opposite sides of said
four sides of said sliding block, and a second pair of
surfaces and surrounding said second pair of openings
of said sliding block.
liquid-tight sealing rings located between said mating
surfaces and surrounding openings in the remaining two
sides of said four sides of said sliding block, said last
mentioned openings receiving said rotor shaft, a second
sealing ring concentrically surrounding each one of said
sealing rings provided on said four sides of said seal
ing block, and grease-passageways being provided in said 35
pump casing whereby annular clearance spaces formed
between adjacently-arranged concentric sealings rings
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,400,282
2,159,941
2,287,369
2,895,423
2,908,177
1921
1939
1942
1959
1959
FOREIGN PATENTS
may be ?lled with grease.
2. A variable-capacity rotary pump comprising a
Gates ______________ __ Dec. 13,
Guinness ____________ __ May 23,
Anderson ____________ __ June 23,
Shoosmith __________ __ July 21,
Powell ______________ __ Oct. 13,
689,313
Great Britain ________ __ Mar. 25, 1953
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