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Патент USA US3093098

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June 11, 1963
D. A. VENTRESS
METHOD AND INSTALLATION FOR PUMPING
LIQUID TO ANY DESIRED LEVEL
3,093,088
Filed D60. 28, 1959
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N Y A
INVENTOR
DOUGLAS ARTHUR VENTRESS
kin’
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ATTORNEYS
United States Patent Oil ice
3,093,088
Patented June 11, 1963
1
2
3,093,088
raised above the level of liquid in a storage vessel, res-er
volir, bore hole or other source, means for bringing about
this raising ‘or lowering, with such timing that the total
vertical length of the column or columns of liquid in the
METHOD AND INSTALLATION FOR PUMPING
LIQUID TO ANY DESIRED LEVEL
Douglas Arthur Veutress, 10 Winkley St, Berea, East
London, Cape Province, Republic of South Africa
pipe at any stage of the pumping cycle is less than the
maximum column length which could be supported in a
barometric tube by the atmospheric or other pressure
prevailing in the gas ‘space above the level ‘of the liquid
to be pumped, a collecting vessel or equivalent connected
a substantially gas-tight manner to the upper, outlet
10
The present invention relates ‘to a method and installa
of the pipe and means for applying suction to the
Filed Dec. 28, 1959, Ser. No. 862,257
Claims priority, application Republic of South Africa
Jan. 20, 1959
12 Claims. (Cl. 103-432)
tion for pumping liquid.
saidfcollecting vessel. In the preferred embodiment, the
It is an object of the invention to provide a new or
lower part of the said pipe or the like is adapted to be
moved independently of the main part of the pipe, e.-g.
improved method and means for pumping liquid to ‘any
desired level.
15 in .a telescopic manner. For this purpose the said lower
A further object of the invention is the provision of _ portion of the pipe may be provided with a sliding ‘sleeve,
‘a method ‘and means for pumping liquid from bore holes
ladapted to surround the lower end of the main part of
and similar dif?culty accessible places, involving a mini
the pipe, suitable sealing means being provided between
mum of moving parts in those places.
the said sleeve and the main part of the pipe if required,
One advantage of the invention is that it avoids the 20 e.g. in the form of a packing.
use vof complicated mechanical parts in contact with the
The means for bringing about the reciprocating up
liquid and is therefore very well suited to the pumping
and down movement may comprise means for bringing
of corrosive liquids, e.g. in chemical processes.
these movements about automatically. Thus an 'actu'at
Further objects, advantages and applications of the
iu'g device may be provided which is triggered when the
invention will become apparent from the following de 25 lower or upper end of the said column- of liquid passes
scription.
a certain level. The actuating device is preferably ?oat
A method for pumping liquid to any desired level in
controlled, and may comprise an electric relay.
accordance with the invention comprises submerging the
The primary source of power for the lifting and lower
lower end of 1a pipe or similar conduit in the liquid to be
ing mechanisrnmay be a hydraulic winch gear, which
pumped, applying suction to the upper end of the tube
acts ‘on the said lower portion by means of a cable. This
or the like, withdrawing the pipe ‘above the level of said , winch gear maybe provided with a control lever which
liquid to be pumped as soon as a column of liquid has
is actuated by a solenoid, which, in turn is activated by
been drawn into the pipe or the like which has the desired
the electric relay. Spring return means may ‘be pro
length, but the vertical length of which is less, than ‘the
vided to move the control lever to another position aiter
maximum column length which could be supported in la
a suitable time delay.
barometric tube by the atmospheric or other pressure
The means for applying suction may be a suction pump
prevailing in the gas space above the level of the liquid
of any suitable kind.
to be pumped, and which further comprises drawing the
The invention and the manner in which it may be put
said column of liquid after its isolation from the liquid
into practice will be further described by way of ex
to be pumped through the pipe up to the desired height. 40 ample with reference to the accompanying drawing with
In the preferred method, the liquid is allowed to run
out thereby limiting the scope of the invention.
into a collecting vessel or the like after it has been drawn
The drawing represents a diagrammatic side elevation
to the required height. The above-mentioned cycle of
of a preferred embodiment of the invention, partly in
operations may be repeated as many times as necessary
section.
to pump a given amount of liquid to a higher level.
Referring to the drawing, 1 is the outer casing of a
45
Preferably the said tube or the like is not raised ‘and
borehole provided with a cap 2. A pipe 3 ‘leads down
lowered as a whole but is provided with an end portion
the borehole to a level which is a certain distance above
which is movably connected thereto, preferably in a tele
the liquid level indicated by the horizontal dotted line.
scopic manner, and which is raised and lowered while
This lower portion of the pipe is surrounded by a sleeve
the main portion of the tube remains stationary. The 50 5, packings 6 being provided between the pipe and the
said pulse-like raising and lowering of the end of the
sleeve. The sleeve is adapted to slide up and down
pipe may be effected by automatic means. In the pre
with respect to the pipe 3. A further pipe section 7
ferred method, the suction is applied continually during
isv connected to the lower end of the sleeve 5, long enough
the reciprocating movement of the lower end of the pipe.
to be lowered below the liquid level before the sleeve
In one preferred embodiment of the invention the 55 slides beyond the lower end of the pipe 3.
lowering movement of the pipe end is elleoted by #2111
One end of a cable 8 is connected to the sleeve 5.
‘actuating device which is triggered when the lower end
The cable passes up the borehole to a hydraulic winch
of the said column of liquid passes the desired level to
gear 9, the control lever 10» of which is actuated by a
which the liquid is pumped. The actuating device may
solenoid 11 which in turn is actuated by a relay 12, and
be an electric relay which controls .a hydraulic winch 60 another solenoid 17 operating in the opposite direction
gear.
_
when energised by a relay 18. Relay 12 is controlled by
According to an alternative method, the upper end of
a ?oat switch of a known construction 16.
a rising column of liquid triggers 1an actuating device
The upper end of the pipe 3- is bent around in a syphon
which then causes the pipe end to be lowered into the
like manner and passes into a vacuum collecting vessel
liquid in the reservoir.
65 13, to which it is connected in a gas-tight manner. A
The lengths of the column to be sucked up with every
pump 14 serves to apply suction to the vessel 13. A
pulse may be determined by similar means or by the
manual and automatic ?oat sealing and relief valve '15
length of time during which the pipe end is submerged,
is also provided.
or in any other suitable manner.
The winch mechanism 9 comprises a hydraulic motor
22 directly coupled to the winch drum, a hydraulic pump
23 connected by pipes to motor 22 and an electric motor
24 with starter '25. A stop 26 is provided on the winch
The means for carrying out the method speci?ed above
comprise a pipe or similar conduit, the lower end of
which is adapted‘ to alternately be submerged below and
70
3,093,088
3
4
rope 8 which moves between, and actuates, low limit and
high limit electric switches 19 and 20.
The installation operates as follows:
Pump 14 is started and electric motor 24 is started
up with starter 25. At this stage the hydraulic motor
22 is at a standstill since springs 21 hold the operating
.lever 10' of the hydraulic pump 23 in the neutral posi
to be pumped as soon as a column of liquid has been
drawn into the tubular conduit which has the desired
length, but the vertical length of which is less than the
maximum column length which could be supported in a
barometric tube by the pressure prevailing in the gas
space above the level of the liquid to be pumped, and
drawing said column of liquid after its isolation from the
liquid to be pumped through the pipe up to the desired
tion.
height.
Float switch 16 is now tripped by a push button (not
2. A method for pumping liquid as claimed in claim 1
shown) provided for this purpose whereby relay 12 is 10
including the step of allowing the liquid to run into a
energised. Relay 12 provided with a holding coil in
collecting vessel after it has been drawn to the required
turn keeps solenoid 11 energised which pulls over lever
height.
10 to cause the unwinding of the cable 8 from the
winch.
Stop 26 on wire rope 8 now moves down until it en
3. A continuous method for pumping liquid to any
15 desired level higher than the barometric head for the par
gages low limit switch 19 which in turn opens the cir
cuit of the holding coil of relay 12 while closing the
circuit of the holding coil of relay 18. Accordingly
solenoid 11 is de-energised and solenoid 17 is energised
whereby lever 10‘ is pulled over to the opposite posi 20
tion and hydraulic motor 22 reverses to wind up the
winch.
Stop 26 now moves upwards until it engages high limit
switch 20, which then de-energises the holding coil of
relay 18, causing solenoid 17 to release lever 10 which 25
returns to the neutral position, thereby bringing hydraulic
motor 22 to a stop.
As a result of these various steps, the pipe section 7
is lowered below the liquid level 4 while suction is ap
plied and is then raised again. The pipe is now partly
ticular liquid above the level of liquid from which it is
pumped, which comprises submerging the lower end of
a pipe of a length greater in vertical extent than said
barometric head in the liquid to be pumped, applying
suction to the upper end of the pipe, withdrawing said
lower end of the pipe above the level of said liquid to
be pumped as soon as a column of liquid has been drawn
into the pipe which has the desired length, but the vertical
length of which is less than the maximum column length
which could be supported in a barometric tube by the
pressure prevailing in the gas space above the level of
the liquid to be pumped, and drawing said column of
liquid after its isolation from the liquid to be pumped
through the pipe up to the desired height, and lowering the
30 end of the pipe below the level of said liquid to be
?lled with liquid, however, the time delay between the
lowering and raising of the pipe section is adjusted in
pumped and repeating this cycle of operations continuous
ly with a pulse-like alternation of raising and lowering
such a manner that the liquid column is still shorter than
the pipe at a rate so controlled that the total liquid head
in the pipe between the upper and lower ends thereof is
the length which could theoretically be supported by the
always less than the maximum column length which could
be supported in a barometric tube by the pressure pre
vailing in the gas space above the level of the liquid to
maximum pressure difference obtainable between the vacu
um collecting vessel and the gas space above the liquid
level 4.
Suction is continued while the lower pipe section is
raised, as a result of which the liquid in the pipe is drawn
upwards into the collecting vessel. As soon as the
upper end of the column of liquid passes the ?oat switch
be pumped with due provision for friction and velocity
head losses.
4. A method for pumping liquid to any desired level
as claimed in claim 3 including the step of automatically
effecting the pulse-like raising and lowering of the end
of the pipe.
16, relay 12 is again energised and the whole cycle of
operations is automatically repeated.
Of course, it is also possible to replace the ?oat switch
16 by a device in a suitable position which will be tripped
when the tail end of the liquid column passes the device.
It is also possible to construct the apparatus in such a
manner that when the lower end of the column of liquid
passes the relay 12, the winch gear 9 is caused to unwind
a length of cable to lower the pipe section 7, a spring
return device on the lever 10 subsequently causes the pipe
section 7 to be raised again after a short time delay.
The cycle of operations is repeated as many times as
is necessary to pump up the desired amount of liquid.
It will be obvious to those skilled in the art that the
method and device are operative for as long as the di
ameter of tubular conduit 3, 7 is maintained below the
5. A method for pumping liquid as claimed in claim 3,
including the step of continually applying the suction
during the repeated insertion into and withdrawal of the
lower end of the pipe from the liquid in the repeated
cycle of operation.
50
6. An apparatus for pumping liquid from a source of
liquid to any desired level higher above the source than
the barometric head for the particular liquid, which com
prises a tubular conduit of a length greater in vertical
extent than said barometric head and having an upper
outlet part and a lower end, the lower end of said con
duit being adapted to alternately be submerged below and
raised above the level of liquid in the said source of
liquid, means for effecting said alternate raising and sub
merging, with a controllable timing such that the total
vertical length of all columns of liquid in the conduit at
limit above which air tends to break through the liquid
contained in the pipe. As will be readily appreciated
this maximum diameter depends on the surface tension 60 any stage of the pumping cycle, the plural to include the
singular, is less than the maximum column length which
of the liquid being pumped, its viscosity and the cross
could be supported in a barometric tube by the pressure
sectional shape and wetting properties of the pipe. Since
prevailing in the gas space above the level of the liquid
all three factors are variable within wide limits it is
to be pumped, with due provision for friction and velocity
pointless to state upper limits for the pipe diameter, which
can be readily determined, if necessary, by anyone con 65 head losses, at collecting vessel connected in a substan
tially gas-tight manner to the upper outlet part of the
fronted with a particular pumping problem.
tubular conduit and means for applying suction to the
What I claim is:
said collecting vessel.
1. A method for pumping liquid to any desired level
7. An apparatus as claimed in claim 6 in which said
higher than the barometric head for the particular liquid
conduit includes a main conduit part and a lower conduit
above the level of liquid from which it is pumped, which
part, said main part being stationary and the said lower
comprises submerging the lower end of a tubular conduit
conduit part being vertically movable relative to the main
of a length greater in vertical extent than said barometric
part, the means for effecting the alternate raising and sub
head in the liquid to be pumped, applying suction to the
merging of the conduit being adapted to alternately raise
upper end of said tubular conduit, withdrawing said lower
end of the tubular conduit above the level of said liquid 75 and lower the said lower conduit part.
4"s
3,093,088
5
6
8. An apparatus as claimed in claim 6 in which the
said tubular conduit at its lower end terminates in a
terminal tubular member in vertically slidable sealing re
head losses, a collecting vessel connected in a substan
tially gasstight manner to the upper outlet part of the
tubular conduit, means for applying suction to the said
collecting vessel and means for automatically controlling
the above-mentioned timing by means of an actuating
lationship to the remainder of the tubular conduit, said
means for effecting the .alternate raising and submerging
of the conduit being adapted to alternately raise and lower
the terminal tubular member, the remainder of the tubular
device adapted to be triggered when ‘the column of liquid
passes the level of the actuating device.
conduit being stationary.
11. An apparatus for pumping liquid from a source
9. An apparatus for pumping liquid from a source of
of liquid to any desired level higher above the source
liquid to any desired level higher above the source than 10 than the barometric head for the particular liquid above
the barometric head for the particular liquid above the
the level of liquid from which it is pumped, which com
level of liquid from which it is pumped which comprises
prises a tubular conduit of a length greater in vertical
a tubular conduit of a length greater in vertical extent
extent than said barometric head and having an upper
than said barometric head and having an upper outlet
outlet part and a lower end, the lower end of said con
part and a lower end, the lower end of said conduit being
duit being adapted to alternately be submerged below
adapted to alternately be submerged below and raised
and raised above the level of the liquid in the said source
above the level of liquid in the said source of liquid,
of liquid, a hydraulic winch gear, a cable operably con
means for eliecting said alternate raising and submerg
necting the winch gear with said lower end for effecting
ing with a controllable timing such that the total vertical
the alternate raising and submerging, with such timing
length of all columns of liquid in the conduit at any stage
that the total vertical length of all columns of liquid in
of the pumping cycle, the plural to include the singular,
the conduit at any stage of the pumping cycle, the plural
is less than the maximum column length which could be
to include the singular, is less than the maximum column
supported in a barometric tube by the pressure prevailing
length which could be supported in a barometric tube
in the gas space above the level of the liquid to be pumped,
by the pressure prevailing in the gas space above the level
with due provision for friction and velocity head losses, 25 of the liquid to be pumped, with due provision for fric
at collecting vessel connected in a substantially gas-tight
tion and velocity head losses, a collecting vessel con
manner to the upper outlet part of the tubular conduit,
nected in a substantially gas-tight manner to the upper
means for applying suction to the said collecting vessel
outlet part or" the tubular conduit and means for apply
and means for automatically controlling the above-men
ing suction to the said collecting vessel.
tioned timing.
v12. An apparatus as claimed in claim 11 in which the
10. An apparatus for pumping liquid from a source
winch gear is provided with a control lever which is
of liquid to any desired level higher above the source
actuated by at least one solenoid.
than the barometric head for the particular liquid which
comprises a tubular conduit having an upper outlet part
References Cited in the ?le of this patent
and a lower end, the lower end of said conduit being
UNITED STATES PATENTS
adapted to alternately be submerged below and raised
above the level of liquid in the said source of liquid,
means for eltecting said alternate raising and submerging
with a controllable timing such that the total vertical
length of all columns of liquid in the conduit at any 40
stage of the pumping cycle, the plural to include the
singular, is less than the maximum column length which
could be supported in a barometric tube by the pressure
prevailing in the gas space above the level of the liquid 45
to be pumped, with due provision for friction and velocity
248,355
617,899
705,670
1,727,216
1,883,153
1,985,283
Schutte _______________ __ Oct. 18,
Krogh _______________ __ Jan. 17,
Henson ______________ __ July 29,
Porter _______________ __ Sept. 3,
Watkins ______________ __ Oct. 18,
Cochrane et a1 _________ __ Dec. 25,
1881
1889
1902
1929
1932
1934
FOREIGN PATENTS
487,036
Italy ________________ __ Nov. 20, 1953
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