Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
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This invention relates to an apparatus for con-
tinuously genexating high pressure fluid comprising a paix of
juxta>osed interlsify:ing pulnps, each pUMp comL:)ri Sirlg an inten-
si~yirlg cylinder in which a piston or a ram is recip~ocably
mounted and driven by a driving gear such that the pumps oper-
ate in opposition.
; lleretofore, when the generation and supply of the high
pressure fluid are continuously effected by opera~ing a pair of
intensifying pumps each including an intensjfying cylinder al-
ternately and in opposition, ~he generation of high pressure
fluid in the respective intensifying cylinder momentarily stops
at the switchover of the movement of the pis-ton or ram from an
, upper dead point or a lower dead point in the respective inten-
I sifying cylinder. Therefore, a sudden change of flow and pres-
sure occurs within a conduit and a high intensity sound is
generated. In order to smooth the operation by decreasing such
high intensity sound just before a piston or a ram in one inten-
sifying cylinder reaches an uppe. dead point, pushing of the
piston or a ram in the other intensifying cylinder is started.
~lowever, the occurrence of impacl: pressure al: the tillle of of the
beginnirlg of rising, i.e. time of beginnillg of pushing in of
respective piston or ram is unavoidable. Also, so that the
intellsifyirlg cylinder may be connected directly with a supply
con(luit pipe for high pressure fluid through a non-return valve,
khe impact pressure extends within the conduit pipe and smooth
operatiorl is impeded. In order to E)revent such noise and provide
a smoothness of an operation, an accumulator is used, but the
volume of the accumulator must be made very large so as to
overcome the irnpact pressure.
'rhe present invention provides an apparatus for the
generation of high pressure which avoids noise and has a srnooth-
ness in operation.
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The present invention also provides for the miniaturiza-
tion of the apparatus whilst performing the operation with good
energy efficiency.
According to the present invention there is provided in
an apparatus for continuously generating high pressure fluid, com-
prising a pair of juxtaposed intensifying pumps each comprising
an intensifying cylinder in which a piston or a ram is mounted
for reciprocation, said pistons being connected to a driving gear
adapted to operate said pumps in opposition, a discharge port for
high pressure fluid being present in each intensifying cylinder
which port is connected to a collecting chamber for high pres-
sure fluid via a non-return valve, said collecting chamber being
connected to a supply conduit for high pressure fluid via a non-
return valve, an accumulator being provided in said supply conduit.
Thus in accordance with the present invention a dis-
charge port for high pressure fluid in the respective intensifying
cylinder is connected to a collecting chamber for high pressure
fluid via a non-return valve. The collecting chamber for high
pressure fluid is Eurther connected to a supply conduit for high
pressure fluid via a non-return valve and an accumulator is pre-
sent in the .supply conduit for high pressure fluid.
The present invention will be further illustrated, by
way of the accompanying drawing, in which:-
Fig. 1 is a schema-tic drawing of an apparatus according
to one embodiment of the present invention.
Referring to Fig. 1, intensifying cylinders 1 and 2 each
have a piston or ram 3 and 4 respectively reciprocably mounted
therein. The pistons or rams 3 and 4 are connected with a cam
mechanism such that pistons or rams 3 and 4 operated in opposition
by a driving gear, for example cams 5 and 6 which are adapted to
operate the pistons or rams simultaneously in opposition. The
respective intensifying chambers 7 and 8 in the intensifying cylin-
-- 2 --
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ders 1 and 2 are provided with fluid suction ports 11 and 12 hav-
ing non-return valves 9 and 10 and discharge ports 13 and 14 for
high pressure ~luid. The discharge ports 13 and 14 of the re-
spective intensifying cylinders 1 and 2 are connected with a
collecting cha~ber 17 for high pressure fluid via non-return valves
15 and 16 respectively. The collecting chamber 17 for high pres-
sure fluid is connected with a supply conduit 19 for high pres-
sure fluid via a non-return valve 18, and an accumulator 20 is
arranged in the supply conduit 19 for high pressure fluid.
The collecting chamber 17 for high pressure fluid is
common to the respective intensifying cylinders 1 and 2. However,
the collecting chamber 17 for high pressure fluid may be replaced
with separate collecting chambers for the respective intensifying
cylinders and the respective gathering chambers for high pressure
fluid may be respectively connected with the supply conduit 19
for high pressure fluid through non-return valves.
A safety valve 21 as in the collecting chamber 17 for
high pressure fluid and an exhaust port 22 is present in the
supply conduit l9 for high pressure fluid.
In operation of the apparatus the piston or rams 3 and
4 are operated in opposition by rotation of the cams 5 and 6 of
the driving gear. Fluid is sucked into the intenslfying chamber
7 and 8 from the suction ports 11 and 12 via non-return valves
9 and lO on descent of the piston or rams 3 and 4, and high pres-
sure fluid is forced into the collecting chamber 17 for high pres-
sure fluid through the discharge ports 13 and 14 for high pressure
fluid while the fluid sucked in the intensifying chambers 7 and 8
is intensified on the ascent of the piston or rams3 and 4. Sub-
sequently the high pressure fluid reaches the supply conduit 19
Eor hiyh p~essure fluid via the non-return valve 18 and is exhaust-
ed through the exhaust port 22.
Further,in detail in the intensifying cylinder 1, high
pressure fluid intensified by the ascent of the piston or ram 3
opens the non-return valve 15 on overcoming the pressure in the
collecting chamber 17 and passes into the collecting ch~r 17 for
high pressure fluid. The pressure in the collecting chamber 17
opens the non-return valve 18 with increasing pressure and passes
into the supply conduit 19. However, when the piston or ram 3
reaches the upper dead point and stops, the pressure in the inten-
sifying chamber 7 decreases and the non-return valve 15 closes.
Also, the pressure in the collecting chamber 17 decreases momen-
tarily by linking with this operation, and the pressure in thesupply conduit 19 overcomes the pressure in the collecting chamber
17 by means of the accumulator 20 and closes the non-return valve
18. Subsequently, the non-return valve 16 opens with the pres-
sure of high pressure fluid generated by the ascent of the piston
or ram 4 in the intensifying cylinder 2, and the aforesaid condi-
tions are repeated.
The high impact pressure momentarily generated when the
pistons or rams 3 and 4 ascent from the lower dead point is
given a buffer action by passing in the collecting chamber 17,
the pressure change in the supply conduit 19 and the noise of the
impact pressure is prevented and operation of the apparatus is
smoothly effected.
The driving gear of the piston or ram in the intensify-
ing cylinder may use a device having a crank mechanism, oil pres-
sure or cam mechanism. ~owever, the speed change of reciprocation
becomes larger with a displacement of the angle from 0 to 180
by the rotation of crank in the crank mechanism, and it is not
necessarily appropriate that the crank mechanism is utilized in
the apparatus for generating ultrahigh pressure. An oil pressure
device is often utilized for the drive of the apparatus for gen-
erating ultrahigh pressure, but this device is not necessarily
simple, and also frequently an energy loss due to a time lag in
-- 4
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the switchover of oil pressure occurs. A device having a cam
converts the rotation of motive power into a direct reciprocation.
It is simple to determine the shape of cam to regulate the re-
ciprocation of the piston or ram for operation with good energy
efficiency, and this device can precisely effect power transmis-
sion using a simple construction.
As mentioned above, in the present invention, the dis-
charge ports for high pressure fluid for the intensifying cylin-
ders of the juxtaposed intensifying pumps, so as to operate in
opposition, are connected with a collecting chamber for high
pressure fluid via the non-return valves. Further, the collecting
chamber for high pressure fluid is connected with the supply con-
duit for high pressure fluid via a non-return valve and together
the impact pressure which is generated at initiation of the in-
tensifying of fluid by the intensifying cylinder isgiven buffer
action because an accumulator is present in the supply conduit
for high pressure fluid. Operation of the apparatus can be per-
formed accurately and smoothly while noise is prevented. Further
when a driving gear based on the cam mechanism is used, it is
possible to miniaturize an apparatus with good encrgy efficiency.
