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Nov. 13, 1962
Filed March 10, 1961
Patented Nov. 13, 1962
its end position to the right, the piston 43 returns towards
Jean lLéon Reutter, Villa Atmos, 43, Rte. de Thanon,
Vesenaz, Switzerland
Fiied Mar. 10, 1961, Ser. No. 94,799
Claims priority, application Switzerland, Nov. 7, 1960
2 Claims. (Cl. 103—163)
The present invention has for object a piston pump,
for liquids, which is characterized in that the piston moves
in a cylinder accompanying it during a part of its stroke,
in that this cylinder is integral with the movable part of
a valve controlled by the piston and disposed to estab
lish the communication between the low pressure cham
the left, the cylinder 46 begins to accompany this move
ment until the seat 51 bears against the Wall 52. From
that moment, the communication is reestablished be
tween the low pressure chamber 53 and the inside of the
cylinder 44. The liquid which is in 53 penetrates into
this cylinder which then ?lls itself until the end of the
stroke of the piston, after which the operations described
with respect to the compression stroke start again, and
so on.
It is obvious that the pump being adapted to
operate at relatively high speed (for example 50 double
oscillations per second), the time necessary to bring the
seats 5t), 51 from the active position to the inactive posi
tion and inversely is extremely short and, consequently,
ber and the inside of the cylinder during the suction stroke 15 negligible.
of this piston, and between this cylinder and the high
At 57 is seen the outlet of the pump. This outlet is
pressure chamber during the compression stroke, abut
connected to a duct 58 issuing in a chamber 59‘ where
ment means being provided to stop the cylinder at the
is the packing 42. This arrangement has for e?lect that
two ends of its stroke.
a part of ‘the fuel oil issuing from the pump serves to
The single ?gure of the accompanying drawing shows, 20 ensure the lubrication of the movable members of the
by way of example, an embodiment of the pump object
It will be seen that the arrangement of the seats 51
of the invention, seen in axial section.
In this example, the pump may be a fuel oil pump for
and 50, distant one from the other by an amount slightly
a burner and its drive may be effected by an oscillating
greater than the thickness of the wall 52, constitutes a
electro-magnetic motor. The driving motor could be of 25 valve controlled by the piston establishing the communi
another type.
cation by the ori?ces 45 between the low pressure cham
In the drawing, the motor not shown communicates a
ber and the inside of the cylinder, during the suction
reciprocating axial movement to a rod 25.
stroke, and between this cylinder and the high pressure .
The rod 25 passes through two water-proof packings
chamber, during the compression stroke, in an absolutely
41, 42. The right-hand end in the drawing of the rod 25, 30 certain manner, whatever the speed at which the pump
indicated by 43, forms the piston of the pump. This pis
ton slides in a cylinder 44 having at 45 radial ori?ces, of
In a variant, instead of the cooperation between the
which only one is visible in the drawing, causing the
piston 43 and the cylinder 44 taking place through the
interior of the cylinder to communicate with its exterior.
agency of a hydraulic device 46, 47, there could be pro
The pump cylinder 44 extends to the left in the shape 35 vided a friction element, ensuring a partial drive, with a
of a cylinder 46 of larger diameter, in which slides an
limited stroke, of the cylinder 44 by the piston 43, at each
auxiliary piston 47, integral with the rod 25 due to a
of the strokes of the latter.
pin 48. This cylinder 46 is provided, in its side Wall,
In a variant, there could be no clearance 55 between
with a hole 49. The unit consisting of the auxiliary pis
44 and 52. The diameter of the hole 45 would then be
ton of the‘ cylinder 46 and of the hole 49 constitutes a 40 equal to the thickness of the wall 52 and the parts Sti and
dash-pot the function of which will be explained later.
51 would no longer operate as seats, but as abutments
The cylinder 44 is integral with two seats 59, 51, each
limiting the stroke of the cylinder 44. In this case also,
disposed on one side of a ?xed wall 52 separating a
one would have a valve (a slidedvalve according to this
low pressure chamber 53 from a high pressure chamber
variant) controlled by the piston and establishing, at the
54. A substantial clearance is provided at 55, between
desired moments, the communication between the low
the outer wall of the cylinder 44 and the part of the
pressure chamber ‘53 and the cylinder 44, and then be
Wall 52 through which this cylinder passes.
tween this cylinder and the high pressure chamber 54.
The operation of this pump is the following:
What I claim is:
In the position shown in the drawing, the piston 43 50
1. Piston pump for liquids, comprising a housing, a
is at the left-hand end of its stroke and the seat ‘51 is
cylinder in said housing, a piston mounted for reciproca
applied against the wall 52, thus closing the communica
tion in said cylinder, a 'wall dividing said housing into a
tion between 54 and 53, on the one hand, and between 54
low pressure chamber and a high pressure chamber, a
and the inside of the cylinder 144, on the other hand. If
?rst passageway between said low pressure chamber and
now, one supposes that the rod 25 moves to the right, 55 said cylinder, a second passageway between said high
the auxiliary piston 47 compresses the liquid arriving by
pressure chamber and said cylinder, means upon said
the duct 56 and ?lling the cylinder 46, as well moreover
cylinder cooperating with said wall to alternately open
as the low pressure chamber 53.
and close said passageways, and hydraulic means co
This action of the auxiliary piston 47 on the liquid
operating with said piston and said cylinder so that said
which is in the cylinder 46 has for eifect to bring about 60 cylinder accompanies said piston along a part of its stroke
the drive of this cylinder 46 and with it the cylinder 44
until said means upon said cylinder abut said wall and
until the abutment 50‘ bears against the wall 52. After
limit the movement of said cylinder and stop it at the
this, the rod 25 and the piston 43 continue their move
end of its stroke to establish through said ?rst passageway
ment independently of the cylinders 46 and 44, the
the connection between said low pressure chamber and
liquid which is in the cylinder 46 issuing therefrom at 65 the inside of the cylinder during the suction stroke of
49. The piston 43 therefore compresses the liquid
said piston, and to establish through said second pas
which is in the cylinder 44. This liquid escapes from
sageway the connection between the inside of said cylin
this cylinder by the holes 45 and reaches the high pres
der and said high pressure chamber during the compres
sure chamber '54. At the instant when, having reached
sion stroke of said cylinder.
2. Piston according to claim 1 wherein said means "Hand said seats being spaced from one another a distance
~ upon vsaid'cylinder cooperating with saidwall comprises
a seat ?xed upon said cylinder at each side of said wall,
said 'Wall having a hole therein separating said 10w pressure chamber from saidvhigh pressure chamber through 5
- greater than the thickness of said wall.
References Cited in the ?le Of this patent
which said cylinder passes with clearance, said cylinder
having an ori?ce allowing the interior‘ of said cylinder to
communicate with ‘the exterior located between said seats,
Ashmuse? ------------- -- Jan- 8, 1918
O’Neill _______________ __ Nov. 4, 1924
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