close

Вход

Забыли?

вход по аккаунту

?

Патент USA US3040676

код для вставки
June 26, 1962
J, B, FLYNN
3,040,666
VARIABLE OUTPUT PUMP
Filed Aug. 24, 1959
Z-SheetS-Sheet 1
M$in/090401 ”
Pg
9
"3
'6
'ka“
..._ 56
5070/
45
/
'
,
72“I
INVENTOR.
June 26, 1962
J. B. FLYNN’
3,040,666
VARIABLE OUTPUT PUMP
Filed Aug. 24, 1959
WI
1%
2 Sheets-Sheet 2
United grates Patent 6 "
B?éth??h .
Patented June‘ 26, 17962
l
2
and ‘which provides for progressively adjusting the pump
3,04%,666
ing rate while the pump is in operation to provide an
accurately controlled pumping rate of any desired value
within an output range which extends continuously be—
VARIABLE OUTPUT PUMP
Jac B. Flynn, Carpentersville, BL, assignor to Hills
McCanna Company, Chicago, 111., a corporation of
tween and includes a zero pump output and the maximum
Hlinois
output capacity of the pump for any driving speed of the
Filed Aug. 24, 1959, Ser. No. 835,470
lt'Claims. (Cl. 103-38)
pump.
Another object is to provide an improved reciprocating
The present invention relates to variable output pumps
pump, adapted to be energized by a constant speed drive,
and more particularly to variable output pumps designed 10 and having a new and improved construction which pro
for incorporation into apparatus systems such as those
vides for'progressive adjustment of the displacement of
used in the chemical processing ?eld, and other environ
the pump while the pump is in operation, the progressive
ments which require that :?uid be supplied at a variable
adjustment of the pumping rate being effected without in
rate which must conform to changing environmental con
terrupting the output of the pump.
ditions.
Another object is to provide a constant speed recipro
The pumping of ?uid in the chemical processing ?eld,
cating pump in which adjustment of a normally sta
for example, is complicated by a number of environmental
tionary pump control while the pump is in operation
factors or requirements which have created difficulties in
serves to progressively vary the displacement and hence
the designing of pumps capable of meeting the operating
the output rate of the pump from zero value to maximum
characteristics desired in this ?eld. In a continuous flow
values corresponding to the constant speed at which the
chemical process, it may be necessary to add a reagent at
pump is driven.
a precise rate to produce the proper concentration or pro
A further object is to provide a constant speed recipro
portion of the reagent in the material involved. More
eating pump in which normally stationary control means.
which not moved by operation of the pump, can be ad
over, the conditions under which such chemical processes
are carried out are often subject to variation and continu 25 justed while the pump is in operation to progressively
ing changes which make it necessary to vary the instan
change the output rate of the pump to any value within
taneous rate at which the reagent is supplied. ‘
the maximum range of the pump, which value corresponds
accurately to the instantaneous position of the normally
The matter of controlling the rate at which a ?uid re
agent is pumped in chemical processing apparatus is com
plicated not only by the necessity for varying the pump
ing rate, but also by the necessity for maintaining an ac
curate control of the instantaneous pumping rate under
?uctuating pressure conditionsv which can eifect either
stationary control means.
.
Another object is to provide a constant speed reciprocat
ing pump as recited in the preceding objects which has an
inherently simple, dependable construction that provides
great e?iciency in operation, which et?ciency is maintained
the back pressure on the pump used or the pressure of
for all output rates of the'pump. A related object is to
?uid as supplied to the pump. Even more troublesome 35 provide an inherently simple and e?icient reciprocating
complications in the designing of pumps suitable for use
in this environment arise from the necessity for avoiding
pump, as recited above, which avoids lost motion be
tween coacting working parts.
interruptions in the supply of reagent pumped. Thus, any
Another object is to provide an adjustable reciprocat
necessity for stopping or interrupting the output of the
ing pump as recited in the above objects which has an in
pump in order to change its output rate could, in many 4.0 herently long service life under hard, continuous usage.
Other objects and advantages will be evident from the
situations, create a highly undesirable disruption of the
process being carried out.
following description of the exemplary embodiment of
Reciprocating pumps, by virtue of their inherent operat
the invention illustrated in the drawings, in which:
FIGURE 1 is a perspective 'view of a variable output
ing characteristics, are particularly well suited for use
in chemical processing apparatus and similar environ 45 constant speed pump embodying the invention;
ments as discussed above.
FIG. 2 is a partially sectioned fragmentary elevational
view of the structure appearing at the right end of FIG. 1;
An operating characteristic of reciprocating pumps
which is highly valued in this ?eld is the ability of such
together with a diagrammatic illustration of automatic
remote control structure for the pump;
pumps to pump at an accurate predetermined rate which
is substantially una?ected by changes in the differential 50
?uid pressure against which the pump operates. Yet, the
matter of varying the instantaneous output rate of a re
ciprocating pump while at the same time maintaining an
accurate control of the pump output rate has been a
challenging problem, particularly in situations inwhich it
is impractical or undesirable to interrupt the pumping
operation to effect changes in the pumping rate. This is
FIG. 3 is a vertical sectional view taken generally along
the line 3—3 of FIG. 2;
'
_ ‘
FIG. 4 is a diagrammatic illustration of operation of
pump control linkages to vary the displacement in the
' pump; and
55
FIG. 5 is a graphic illustration of the relationship of the
output rate of the pump to the position of an element of
the pump control.
'
especially true where it is desirable to make progressive
Referring to the drawings in greater detail, the con
and continuing variations in the instantaneous output
stant speed, variable output pump 10 forming the illus
pumping rate. The expedient of varying the output rate 60 trated embodiment of the invention, FIG. 1, is mounted
of reciprocating pumps by progressively varying the speed
on an elongated base 12. A reciprocating pumping unit
of the drive to such pumps is subject to practical short
14 mounted on one end of the base 12. is connected
comings in that it is di?‘icult to provide a precise control
through inlet and outlet check valves 16, 18 with suitable
of the pump through driving means that is capable of
supply and discharge conduits (not shown) which inter
varying the pump speed progressively throughout a prac 65 connect the pum-ping'unit with the chemical processing
tical speed range, which range should‘iuclude a zero
apparatus, or other ?uid system with which the pump
pumping rate. Moreover, adjustable speed drives suit
is used.
“
able for use in this service are characteristically expen-'
The pumping unit 14 itself is of a well 'known com
sive and subject to service problems.
mercially available construction which need not be spec' ‘One object of the invention is to provide a variable out 70 cally described here. Pumping units of this character
put reciprocating pump having a new‘a'nd improved con
are sold commercially by the Hills-McCanna Company, I
struction adapted to be energized by a constant speed drive
Chicago, Illinois. The pumping unit 14 is energized by
3,040,666
3
As
_
,
.
V
.
a reciprocable operating member 20‘su'pported in a frame '
rotary position‘of the pump adjusting element 42 to swin
22 ‘for translation along. a predetermined linear line of
motion designated in FIG. 1 by the number 24. The
the oscillating lever axis 54 about the'drive shaft axis 31.
displacement of the pump 14 is a direct linear function '
stabilized by a guide formed in this instance by a threaded
element 66 supported on the pump adjusting element 42
and engaging an arcuate bearing surface 68 on the oscil
of the stroke of the operating member 24.
1
Preferably the oscillating inner end of the lever 56 is
‘
In operation, the pumping unit 14 is driven at a con;
stant speed by a constant speed drive which preferably
comprises a constant speed electric motor 26 connected
through a conventional speed reducer 28 to drive an out
lating lever, as shown in FIGS. 2 and 3.
,
The inner end of the oscillating lever 59 is connected
to the outer end of the pump operating member 29 by a
put shaft 30', FIGS. 1 and ,3.
10 connecting rod 70 having a length between the axes' of
The shaft 30 is supported by the speed reducer 23 in
its pivotal connections to the operating member and oscil
a positionispaced beyond the outer end‘ of the pump oper
lating lever, respectively, which is equal to the radial
ating member 24 inwhich the axis 31; of the shaft 3!},
spacing between the pivotal connection of the connecting
FIG. 3, intersects the line of motion 24,. FIG. 1, of the
rod and the oscillating lever from the pivotal axis 54 of
operating, member 26 in perpendicular relation to the
the oscillating lever. As ‘shown, the connecting rod ‘79 is
connected to the oscillating lever by'a pivot stud '72.
The stroke of the operating vmember 20 is adjustable
Moreover, the spacing of the axis of the connecting rod
during operation of the pump by means of a normally
stud 72 from the oscillating lever ~axis54 is equal to the
stationary control element 32 which is not moved‘ by
radial spacing of the oscillating lever axis 54 from the
operation of the pump. As is shown, the pump control
common axis 31 of the drive shaft 36 and-pump adjusting
element 32 is shaped to de?ne an annular knob portion
element 42; The signi?cance of these dimensional rela
34 adapted to be grasped by an operator and rotated to
tionships in controlling operation of the pump will ap
adjust the output rate of the pump.
latter.
'
'
'
pear
Since the control element 32 is not movedby, operation
presently.
V
'
.v
'
-
»
‘
'
‘
The previously mentioned'speed reducing transmission
of the pump and is stationary except fortrotaticn of the 25 4% which effects rotary adjustment of the pump adjust
element to effect adjustment of the pump, it is, relatively
ing element 42 in response to rotation of the control ele
simple matter to control the output rate ‘of the pump
ment32'comprises a gear 74 non-rotatably ?xed to the
automatically in response to changing environmental ‘con
hub of the pump adjusting element 42 as shown in FIGS.
ditions by means a suitable automatic control unit 36, in
2 and 3.‘ The gear 74 meshes with a rack 76 which is
dicated diagrammatically in FIG. 4, which responds to 30 displaced longitudinally by means of a threaded actuator
the critical conditions in which the pump is used-and
operates through a servo motor 38, also indicated dia_
78 on one end of the rack, ‘FIG. 2, ‘which extends into
an adjusting nut 80 supported against axial displacement
and connected for rotation by the previously mentioned
grammatically in FIG. 2, to eiiect rotary adjustment of
the control element 32 as necessary to, produce the de
sired output rate of the pump.
control element 32.
'
The pu-mp‘control element 32, whether operated manu
ally or through a servo motor or the like, acts through
35
>
.
'
'
The transmission 41! thus provided serves to transform
any degree of rotary’ adjustment of the control element
32 into a corresponding angular adjustment of the pump
a speed reducing drive 40, to be described presently,v to
adjusting element 42 about the axis 31.
'
eiiect rotary adjustment of a pump adjusting element 42
Moreover, as will appear from a reference to the'dia
journalled for rotation about the axis 31 of the drive 40 grammatic illustration in FIG. 4 taken in conjunction wih
shaft 30 and extending radially outward from the drive
the‘ previous descriptionwof the pump structure, the dis
shaft, as shown. in FIGS. 1 and 3.
'
.
placement of the pump and hence its output‘ rate are
Radial, support for the pump adjusting element 42 is
progressively adjustable from a zero‘value to maximum
provided by antifriction bearings, 44 supported on the
e?ective values for the pump by an angular displacement
sleeve 46 of a pump driving member 43 connected to the
of the pump adjusting‘element 42' through a 90 degree
angular range of movement which includes and extends
An oscillating lever 59 is pivotally supported on the
away from a position of the pumpadjusting element 42 in
pump adjusting member 42 in radially. spaced relation to
which the pivotal axis 54 of the oscillating lever 50 co
the common axis 31 of the shaft 30 and pump adjusting
incides with the axis 82, FIG. 1, of the pivotal connection
member 42 and extends inwardly into traversing relation
of the connecting rod 70 to the pump operatingmember
to. the outer end of the pump driving member 48, as
shown. Thus, the outer end of the oscillating lever 59 is
Since the eifective length of the connecting rod 70 is
journalled for swinging movement about a pivot stud 52
equal to'the radial distance between the pivotal connec
carried by the outer end of the pump adjusting element
tion of the rod with the oscillating lever 50 from the axis
42 and de?ning a pivotal axis 54 'for'the oscillating lever. 55 54 of the oscillating lever, angular adjustment of the con
Oscillation of the lever 50 about its supporting axis 54
trol. element 42 to bring the oscillating lever axis 54 into
is effected by means of an actuator :56, FIG. 3, eccentri
coincidence with the pivotal axis 82 of the rod 79 on the
cally mounted on the driving member 48 and extending
operating member 20 reduces the pump displacement and
axially into engagement with an elongated‘ track or oper
the pumping rate to zero. This follows from the fact
ating groove 58 formed on the driving member end of 60 that for this angular position‘of the pump adjusting ele
the oscillating lever'in generally parallel relation .to a
ment 42 both the oscillating lever 5t} and the connecting
radialline extending therealong from the lever axis 54.
rod 72 oscillate about a common axis, the connecting rod
Preferably, the actuator groove 58 which receives the
producing'no displacement of the pump operating mem~
eccentric actuator 56 is de?ned by a pair of straight paral
her. 20. However, upon angular displacement of the
lel bearing plates 60, ?xed to opposite sides of the inner 65 pump adjusting element 42 away from the position in
end of the oscillating lever 56 in embracing relation to an
which the axes 54 and 82 coincide, oscillation of the
elongated recess 60 in the oscillating lever, which faces
pivotal connection 72 between the connecting rod 70and
toward the driving member 48. The two bearing plates
the oscillating lever 50 about the axis 54 of the oscillating
60 simultaneously engage opposite sides of the actuator - lever produces a longitudinal reciprocation of the pump
shaft30.
'
i
'
'
'
i
’
20.
‘
e
'
‘
'
'
‘
'
56 to elinimate any lateral play or lost motion of the 70 operating member 20 which is substantially proportional
actuator in the groove 58.
to the degree of angular displacement of the pump ad
It will be appreciated that rotation of the eccentric
justing element 42 away from its initial or'zero pumping
position through a 90-degree angular range of movement.
actuator 56 in a circular path by means of the drive shaft
30 causes the lever 50‘ to oscillate through ‘an angular
The angular displacement‘of the adjusting element 42
range of movement which is nna?ected by changes in the 75 away from its initial or zero pumping rate position is desig
3,040,666
5
,
nated in FIG. 4 by the number 84. The corresponding
stroke of the pump operating member 20 is designated in
FIG. 4 by the number 86. HG. 4 depicts the two ex
treme positions of the lever 50 and connecting rod 70 for
two angular positions of the adjusting element 42. The
extreme positions reached by the moving parts when the
adjusting element has been displaced through the angle 84
from its zero pumping position are designated with the
reference numbers for'the parts with the addition of the
6
.
.
_
to said lever which are individually equal to the length of
said connecting rod between its pivotal connections to said
operating member and said lever, a gear connected to
‘ rotate said adjusting member about said shaft axis, a lon
gitudinally movable rack engaging said gear, and rotatable
adjusting means threadably connected to said rack to dis
place the latter longitudinally upon rotation of said ad
justing means to adjust the rotary position of said adjust
ing member about the axis thereof to vary the stroke of
member.
170 said2. operating
A variable output reciprocating pump adjustable dur
The effective stroke of the operating member 26, and
sumx “a.”
\
,
hence the displacementof the pump, is substantially a '
ing operation thereof to vary the output rate of the pump
linear function of the angle 84 for a 90 degree angular
and comprising, in combination, a reciprocable pumping
unit including a translatable operating member, a drive
This relationship of the pump displacement to the angular 15 shaft rotatable about an axis disposed in generally per
pendicular intersecting relationto an extension of the line
displacement of the pump adjusting element 42 from its
of motion of said operating member, a pump adjusting
zero pumping position is illustrated by the graph in FIG.
member mounted ‘for rotation about the axis of said shaft
5 in which the pump stroke in terms of percentages of its
and extending radially therefrom, an oscillating lever piv
maximum value appears as the abscissa and the angular
position of the pump adjusting element in terms of per 20 otally mounted on said adjusting member in radially
spaced relation to said shaft axis to extend across said
centages of a 90° displacement'from its zero pumping
shaft axis, means on the shaft end of said oscillating lever
' position appears as the ordinate.
de?ning an elongated track which is shaped and supported
The angular position of the pump adjusting element 42
by said lever for‘oscillation across said shaft axis, an
is visually indicated by an arcuate scale 88 on the pump
adjusting element, FIG. 1, which is read against a sta 25 actuator mounted on said shaft in eccentric relation to
said shaft axis and engaging said track to oscillate said
tionary reference mark 90. The scale 88 can be gradu
lever upon rotation of said shaft, said actuator having a
ated to indicate the angular position of the element 42
radial spacing from. the axis of said shaft such that the
in terms of the corresponding values of the pump dis
diameter of, the circle through which the center of said
, placement.
The output rate of the pump 10 just described can be 30 actuator is rotated greatly exceeds the Width of said track,
a connecting rod pivotally connected at opposite ends to
adjusted to any value within its operative range, while the
said operating member and to the shaft end of said lever,
pump is in operation, simply by turning the adjusting ele
the pivotal axis of said lever having radial spacings from
ment 32, either manually or by means of suitable auto
said shaft axis and from said pivotal connection of said
matic control structure, as ‘indicated. For all output
connecting rod to said lever which are individually equal
rates, the pump operates without lost motion to provide
to\the effective length of said connecting rod, a pump con
a high operating efficiency in pumping at a rate which con
trol member, and speed reducing means connecting said
forms accurately to the instantaneous position of the
control member to said adjusting member to rotate the
pumps adjusting element 32. Moreover, the pump is
formed of a sturdy, inherently simple construction and 40 latter to effect adjustments in the stroke of said operating
member.
has a long service life under hard, continuous usage.
3. A variable output pump adjustable during operation
It will be appreciated that the invention is not neces
thereof to vary the output rate thereof, comprising, in
sarily limited to the embodiment illustrated, but includes
combination, a reciprocating pumping unit including an ’
structural variants within the spirit and scope of the inven
operating member therefor mounted ‘for movement in
tion as de?ned by the claims.
45 opposite directions along a predetermined path, a rotary
The invention is claimed as follows:
driving member mounted for rotaiton about an axis spaced
1. A variable output reciprocating pump adjustable dur
from said operating member, a rotatable pump adjusting
ing operation thereof to vary the output rate of the pump
element mounted for rotation about the axis of said driv
and comprising, in combination, a reciprocating pumping
unit including inlet and outlet valves and an operating 50 ing member and extending radially away from said axis,
range of movement of the pump adjusting element 42.
member supported for translation in opposite directions
along a predetermined linear line of motion, a rotatable
power shaft mounted in spaced relation to said operating
member and cantilevering toward sald line of motion for
an oscillating element pivotally mounted on said adjust
ing element in radially spaced relation to said axis to ex
tend across said shaft, a connecting rod pivotally con
nected between‘said operating member and the axis, end
of said oscillating element, the pivotal axis of said oscil
rotation about an axis substantially intersecting said line
lating element having spacings from the axis of said driv
of motion in generally perpendicular relation thereto, a
ing ‘member and from the pivotal connection of said rod
pump adjusting member mounted for rotation about the
to said oscillating element which are individually equal to
axis of said shaft and extending radially therefrom, an
the effective length of said rod between the pivotal con
oscillating lever pivotally mounted on said adjusting mem
ber in radially spaced relation to said shaft axis and ex 60 nections thereof to said operating member and to said
tending swingably across the cantilevering end of said - oscillating element, a pair of wear plates mounted on
the'connecting rod end of said oscillating element in
shaft, means on the shaft end ‘of said oscillating lever de
spaced parallel relation to each other to de?ne an actuator
?ning an elongated track generally parallel to a radial
channel generally parallel to a radial line extending there
line extending along said track from the pivotal axis of
said lever, an actuator mounted on said shaft in eccentric 65 along from the pivotal axis of said oscillating element, an
actuator mounted on said driving member in eccentric
relation to said shaft axis and cantilevering into engage- _
relation
to said driving member axis and extending into
ment with said track to oscillate said lever upon rotation
said actuator channel for oscillating said oscillating ele~
of said shaft, said actuator having a radial spacing from
ment upon rotation of said shaft, said plates having a
the axis of said shaft such that the diameter of the circle
through which the center of said actuator is rotated 70 spacing from each other which de?nes a channel having a
width which is only a fraction of the diameter of the circle
greatly exceeds the width of said track, a connecting rod
through which the center of said actuator is rotated,
pivotally connected at opposite ends to said operating
guide. means on said adjusting element coacting with said
member and to the shaft end of said lever, the pivotal axis
oscillating element to guide oscillative movement thereof,
of said lever having radial spacings from said shaft axis
and from said pivotal connection of said connecting rod 75 a speed reducer having an output shaft connected to ro-.
7
3,0a0,ees
8
tate said drivingAmember, a gear connected to rotate said
fecti-ve length of said rod, two channelelernents supported
on the connecting rod end of said oscillating element and
disposeclin spaced parallel relation to 'each other to de
adjusting element about'the rotary'axis thereof, a translata
ble rack coacting Withsaid gear, a'lon'gitndinal threaded
element connected to said rack, ‘and a rotatable threaded
?ne an actuator channel generally parallel to a line ex
element adapted for manual operation and coacting with or tending through‘ the pivotal axis of said oscillating ele~
said longitudinal threaded element to effect rotary adjust
ment and the axis of the pivotal connection between said
ment of said adjusting element to vary the stroke of said
‘connecting rod and said oscillating element, an actuator
operating member.
"
‘
'
mounted on said driving member in eccentric relation to
4. A variable output pump adjustable during operation
said driving member axis and extending into said actuator '
thereof to, vary the output rate thereof, comprising, in 10 channel ‘for oscillating said oscillating element upon ro
combination, a reciprocating pumping unit including an
tation of said, driving member, and adjusting means con
operating element translatable in vvopposite directions, a
nected to said pump adjusting element to adjustably rotate
, driving member mounted for rotation about an axis dis
the latter to vary the excursion of said operating element.
posed‘ in generally perpendicular intersecting relation to
an extension of the line of motion of said operating ele
ment, a rotatable pump adjusting element mounted for
rotation about the axis of said driving member, an oscil
V15
lating element pivotally mounted on said adjusting ele
' ment in radially spaced relation to said axis to extend
across said axis, a connecting rod pivotally connected be 20
tween said operating element and the axis end of said
oscillating element, the pivotal axis of said oscillating ele- ,
ment having spacings from the axis of said driving mem
ber and from the pivotal connection of said rod to said
oscillating element which are individually, equal to the ef 25
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,737,896
2,776,573
Neyer _______________ __ Mar. 13, 1956
Wi1li'_n ______________ __ Ian. 8, 1957
2,780,404
Kuehni _________ _v____.__ Feb. 5, 1957
2,892,360
‘2,953,029
111 __________________ __ June 30, 1959
Caillaud __‘ ___________ __ Sept. 20, 1%0
873,057
France ______________ __ Mar- 2, 1942
FOREIGN PATENTS
Документ
Категория
Без категории
Просмотров
0
Размер файла
807 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа