U.S. patent number 3,838,946 [Application Number 05/365,936] was granted by the patent office on 1974-10-01 for air pressure-actuated double-acting diaphragm pump.
This patent grant is currently assigned to Dorr-Oliver Incorporated. Invention is credited to Robert A. Schall.
United States Patent |
3,838,946 |
Schall |
October 1, 1974 |
AIR PRESSURE-ACTUATED DOUBLE-ACTING DIAPHRAGM PUMP
Abstract
Double-acting air pressure-actuated Diaphragm Pump wherein a
connecting rod inter-connecting the two diaphragms is guided in an
intermediate member rigidly interconnecting the two pump bodies,
and wherein the reciprocations of the diaphragm assembly actuates a
separate valve system effective to admit air pressure alternatingly
to the actuating chambers in the respective pump bodies thereby
maintaining the pump operating cycle.
Inventors: |
Schall; Robert A. (Stamford,
CT) |
Assignee: |
Dorr-Oliver Incorporated
(Stamford, CT)
|
Family
ID: |
26857846 |
Appl.
No.: |
05/365,936 |
Filed: |
June 1, 1973 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
|
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161465 |
Jul 12, 1971 |
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Current U.S.
Class: |
417/395; 417/393;
91/313 |
Current CPC
Class: |
F04B
9/135 (20130101); F01L 15/08 (20130101); F01L
25/063 (20130101); F04B 43/0736 (20130101) |
Current International
Class: |
F01L
15/08 (20060101); F01L 25/06 (20060101); F04B
9/135 (20060101); F04B 43/06 (20060101); F01L
25/00 (20060101); F01L 15/00 (20060101); F04B
9/00 (20060101); F04B 43/073 (20060101); F04b
043/06 () |
Field of
Search: |
;91/230,231,304,307,311,313 ;497/392,393,394,395,402 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Husar; C. J.
Assistant Examiner: Smith; Leonard
Attorney, Agent or Firm: Kearns; Burtsell J. Jablon;
Theodore M.
Parent Case Text
This is a continuation, of application Ser. No. 161,465, filed July
12, 1971, now abandoned.
Claims
1. A double-acting fluid pressure-actuated diaphragm pump which
comprises
a first pump housing having a valved intake connection and a valved
discharge connection,
a first pump diaphragm provided with a pair of central clamping
plates, and dividing said first pump housing into a first pumping
chamber communicating with said intake- and discharge connections,
and a first actuating chamber having an opening concentric with the
diaphragm,
a second pump housing disposed axially symmetrical to said first
pump housing, as well as axially spaced therefrom, and having a
valved intake connection and a valved discharge connection,
a second pump diaphragm provided with a pair of central clamping
plates, and dividing said second pump housing into a second pumping
chamber communicating with said second intake- and discharge
connections, and a second actuating chamber facing said first
actuating chamber, and having an opening concentric with the
diaphragm,
a connecting member rigidly interconnecting the mutually opposed
inwardly facing ends of the two pump housings in concentrically
aligned relationship to one another,
an actuating rod rigidly interconnecting the respective pairs of
clamping plates with one another, and guided for longitudinal
reciprocating movement in said connecting member, and in sealing
relationship to each of said housings, so that the pump delivery
stroke of the one diaphragm will coincide with the pump intake
stroke of the other diaphragm,
a control system for maintaining the operating cycle of the pump,
operatively connected to said first and second actuating chambers,
and having a pressure fluid supply connection, and having a control
member movable between two end positions, said member when moved to
one position, effective to allow said control system to admit
pressure fluid to the first of said actuating chambers, while
allowing the second actuating chamber to be vented, and when moved
to the opposite position, effective to allow said control system to
admit pressure fluid to the second actuating chamber, while
allowing said first chamber to be vented, in the course of said
pumping cycle,
transmitting means for actuating said control member from the
reciprocations of the assembly of interconnected diaphragms, which
means comprises a first pusher pin parallel to said actuating rod
and mounted in the wall of the actuating chamber of one of said
diaphragm housings in sealing relationship therewith, said pusher
pin being adapted to transmit movement of the clamping plates of
the adjacent diaphragm to said control member so as to move the
same in one direction, and a second pusher pin parallel to said rod
and mounted in the wall of the actuating chamber of the other of
said housings in sealing relationship therewith, said pusher pin
being adapted to transmit movement of the clamping plates of the
adjacent diaphragm to said control member so as to move the same in
the opposite direction,
and means for adjusting the effective length of the pusher pin,
said means comprising a stop member having threaded connection with
the inner end portion of the pusher pin, and cooperating with the
adjacent end portion of said control member.
2. A double-acting fluid pressure-actuated diaphragm pump which
comprises
a first pump housing having a valved intake connection and a valved
discharge connection,
a first pump diaphragm provided with a pair of central clamping
plates, and dividing said first pump housing into a first pumping
chamber communicating with said intake and discharge connections,
and a first actuating chamber having an opening concentric with the
diaphragm,
a second pump housing disposed axially symmetrical to said first
pump housing, as well as axially spaced therefrom; and having a
valved intake connection and a valved discharge connection,
a second pump diaphragm provided with a pair of central clamping
plates, and dividing said second pump housing into a second pumping
chamber communicating with said intake- and discharge connections,
and a second actuating chamber facing said first actuating chamber,
and having an opening concentric with the diaphragm,
a connecting member rigidly interconnecting the mutually opposed
inwardly facing ends of the two pump housings in concentrically
aligned relationship to one another,
an actuating rod rigidly interconnecting the respective pairs of
clamping plates with one another, and guided for longitudinal
reciprocating movement in said connecting member, and in sealing
relationship to each of said housings, so that the pump delivery
stroke of the one diaphragm will coincide with the pump intake
stroke of the other diaphragm,
sealing means inserted into each end of said connecting member,
effective between said actuating rod and each of said pump
housings,
a control system for maintaining the operating cycle of the pump,
operatively connected to said first and second actuating chambers,
and having a pressure fluid supply connection, and having a control
member movable between two end positions, said member when moved to
one position effective to allow said control system to admit
pressure fluid to the first of said actuating chambers, while
allowing the second actuating chamber to be vented, and when moved
to the opposite position, effective to allow said control system to
admit pressure fluid to the second actuating chamber, while
allowing said first chamber to be vented, in the course of said
pumping cycle,
and transmitting means for actuating said control member from the
reciprocations of the assembly of interconnected diaphragms which
means comprise a first pusher pin parallel to said actuating rod
and mounted in the wall of the actuating chamber of one of said
diaphragm housings in sealing relationship therewith, said pusher
pin being adapted to transmit movement of the clamping plates of
the adjacent diaphragm to said control member so as to move the
same in one direction, and a econd pusher pin parallel to said rod
and mounted in the wall of the actuating chamber of the other of
said housings in sealing relationship therewith, said pusher pin
being adapted to transmit movement of the clamping plates of the
adjacent idiaphragm to said control member so as to move the same
in the opposite direction, with the addition that each said pusher
pin is slidable in a holder in sealing relationship therewith, said
holder being detachably connected to said housing in sealing
relationship therewith and comprising a gland member inserted in a
respective flange of said connecting member, wherein said pusher
pin is guided, and retainer means for said gland member removably
mounted on said flange.
3. A double-acting fluid pressure-actuated diaphragm pump which
comprises
a first pump housing having a valved intake connection and a valved
discharge connection,
a first pump diaphragm provided with a pair of central clamping
plates, and dividing said first pump housing into a first pumping
chamber communicating with said intake- and discharge connections,
and a first actuating chamber having an opening concentric with the
diaphragm,
a second pump housing disposed axially symmetrical to said first
pump housing, as well as axially spaced therefrom, and having a
valved intake connection and a valved discharge connection,
a second pump diaphragm provided with a pair of central clamping
plates, and dividing said pump housing into a second pumping
chamber communicating with said second intake- and discharge
connections, and a second actuating chamber facing said first
actuating chamber, and having an opening concentric with the
diaphragm,
a connecting member rigidly interconnecting the mutually opposed
inwardly facing ends of the two pump housings in concentrically
aligned relationship to one another,
an actuating rod rigidly interconnecting the respective pairs of
clamping plates with one another, and guided for longitudinal
reciprocating movement in said connecting member, and in sealing
relationship to each of said housings, so that the pump delivery
stroke of the one diaphragm will coincide with the pump intake
stroke of the other diaphragm,
a control system for maintaining the operating cycle of the pump,
operatively connected to said first and second actuating chambers,
and having a pressure fluid supply connection, and having a control
member movable between two end positions, said member when moved to
one position, effective to allow said control system to admit
pressure fluid to the first of said actuating chambers, while
allowing the second actuating chamber to be vented, and when moved
to the opposite position, effective to allow said control system to
admit pressure fluid to the second actuating chamber, while
allowing said first chamber to be vented, in the course of said
pumping cycle,
transmitting means for actuating said control member from the
reciprocations of the assembly of interconnected diaphragms, which
means comprise a first pusher pin parallel to said actuating rod
and mounted in the wall of the actuating chamber of one of said
diaphragm housings in sealing relationship therewith, said pusher
pin being adapted to transmit movement of the clamping plates of
the adjacent diaphragm to said control member so as to move the
same in one direction, and a second pusher pin parallel to said rod
and mounted in the wall of the actuating chamber of the other of
said housings in sealing relationship therewith, said pusher pin
being adapted to transmit movement of the clamping plates of the
adjacent diaphragm to said control member so as to move the same in
the opposite direction,
each said pusher pin being slidable in a holder in sealing
relationship therewith, said holder being detachably connected to
said housing in sealing relationship therewith, with the addition
of pressure compensating means effective between said pusher pin
and said holder, constructed and arranged to counter balance the
pressure upon the pusher pin of the fluid pressure medium in the
adjacent actuating chamber, incident to the axial movement of the
pusher pin.
4. A double-acting fluid pressure-actuated diaphragm pump which
comprises
a first pump housing,
a first pump diaphragm provided with a pair of central clamping
plates, and dividng said first pump housing into a first pumping
chamber having first intake- and discharge connections, and a first
actuating chamber having an opening concentric with the
diaphragm,
a second pump housing disposed axially symmetrical to said first
pump housing, as well as axially spaced therefrom, and having a
valved intake connection and a valved discharge connection,
a second pump diaphragm provided with a pair of central clamping
plates, and dividing said second pump housing into a second pumping
chamber having second intake- and discharge connections, and a
second actuating chamber, facing said first actuating chamber, and
having an opening concentric with the diaphragm,
a connecting member rigidly interconnecting the mutually opposed
inwardly facing ends of the two pump housings in concentrically
aligned relationship to one another,
an actuating rod rigidly interconnecting the respective pairs of
clamping plates with one another, and guided for longitudinal
reciprocating movement in said connecting member, and in sealing
relationship with each end thereof, so that the pump delivery
stroke of the one diaphragm will coincide with the pump intake
stroke of the other diaphragm,
a control system for maintaining the operating cycle of the pump,
which comprises
a first main three-way control valve unit having a valve housing
provided with communicating connections extending respectively to a
supply of said fluid pressure medium and to one of said actuating
chambers and to the atmosphere, and having a first plug valve
member shiftable in said housing, said valve member, said housing
and said communicating connections being so constructed and
arranged relative to one another, that shifting the valve member in
one direction will condition the valve unit for admitting said
fluid pressure medium to said one actuating chamber to execute the
pump filling stroke, while shifting of the valve member in the
opposite direction will condition the valve unit for venting said
actuating chamber during the pump delivery stroke,
and a second main three-way control valve unit having a valve
housing with communicating connections extending respectively to a
supply of fluid pressure medium and to the other chamber and to the
atmosphere, and having a second plug valve member shiftable in said
housing, said valve member, said housing and said communicating
connections being so constructed and arranged relative to one
another, that shifting the valve member in one direction will
condition the valve unit for admitting said fluid pressure medium
to said other actuating chamber to execute the pumping stroke,
while shifting the valve member in the opposite direction will
condition the valve unit for venting said actuating chamber during
the pump filling stroke,
said second and said first main control valve units being actuated
in alternation by said auxiliary valve unit in synchronism with the
reciprocation of said connecting rod,
each said main three-way control unit having a main plug valve
member surrounded by a compression spring urging said member into
pressure fluid admitting- and vent closing position, and so
arranged that fluid pressure exerted from said auxiliary plug valve
unit will shift the main plug valve member against spring action
from pressure admitting- to vent closing position.
and an auxiliary plug valve unit adjacent and in fixed relationship
to said connecting member, and having a pressure fluid supply
connection, and a reciprocable plug valve member, said valve unit
operatively connected to said main control means, so that
reciprocating movement imparted to said plug valve member will
cause said main control means to correspondingly operate said
pumping cycle,
and transmitting means for actuating the auxiliary plug valve unit
from the reciprocations of the interconnected diaphragms at each
end of a pumping stroke, said transmitting means comprising
a first pusher pin parallel to said actuating rod and mounted in
the wall of one of said actuating chambers in sealing relationship
therewith, said pusher pin being adapted to transmit movement of
the clamping plates of the adjacent diaphragm to one end of the
auxiliary plug valve member so as to move the same in one direction
at the end of one stroke of the pumping cycle,
and a second pusher pin parallel to said actuating rod and mounted
in the wall of the other actuating chamber in sealing relationship
therewith, said pusher pin being adapted to transmit movement of
the clamping plates of the adjacent diaphragm to the other end of
the auxiliary plug valve member so as to move the same in the
opposite direction at the end of the next stroke of the pumping
cycle.
5. The pump according to claim 4, wherein said auxiliary plug valve
unit is mounted upon said connecting member, interposed between
said pusher pins, and wherein the longitudinal axis of said plug
valve unit is codirectional with said pusher pins and with said
actuating rod.
6. A double-acting fluid pressure-actuated diaphragm pump which
comprises
a first pump housing having a valved intake connection and a valved
discharge connection,
a first pump diaphragm provided with a pair of central clamping
plates, and dividing said first pump housing into a first pumping
chamber communicating with said intake- and discharge connections,
and a first actuating chamber having an opening concentric with the
diaphragm,
a second pump housing disposed axially symmetrical to said first
pump housing, as well as axially spaced therefrom, and having a
valved intake connection and a valved discharge connection,
a second pump diaphragm provided with a pair of central clamping
plates, and dividing said second pump housing into a second pumping
chamber communicating with said second intake- and discharge
connections, and a second actuating chamber facing the first
actuating chamber, and having an opening concentric with the
diaphragm,
a connecting member rigidly interconnecting the mutually opposed
inwardly facing ends of the two pump housings in concentrically
aligned relationship to one another,
an actuating rod rigidly interconnecting the respective pairs of
clamping plates with one another, and guided for longitudinal
reciprocating movement in said connecting member, and in sealing
relationship with each end thereof, so that the pump delivery
stroke of the one diaphragm will coincide with the pump intake
stroke of the other diaphragm,
a control system for maintaining the operating cycle of the pump,
operatively connected to said first and second actuating chambers,
and having a pressure fluid supply connection, and having a control
member mounted adjacent to said connecting member, and movable
between two end positions, longitudinally slidable parallel to said
actuating rod, said member when moved to one position, effective to
cause said control system to admit pressure fluid to the first of
said actuating chambers, while allowing the second actuating
chamber to be vented, and when moved to the opposite position,
effective to cause said control system to admit pressure fluid to
the second actuating chamber, while allowing said first chamber to
be vented, in the course of said pumping cycle,
and transmitting means for actuating said control member from the
reciprocations of the assembly of interconnected diaphragms, which
means comprise a first pusher pin parallel to said actuating rod
and mounted in the wall of the actuating chamber of one of said
diaphragm housings in sealing relationship therewith, said pusher
pin being adapted to transmit movement of the clamping plates of
the adjacent diaphragm to said control member so as to move the
same in one direction, and a second pusher pin parallel to said rod
and mounted in the wall of the opposite actuating chamber in
sealing relationship therewith, said pusher pin being adapted to
transmit movement of the clamping plates of the adjacent diaphragm
to said control member so as to move the same in the opposite
direction, and means for adjusting the effective length of said
pusher pins and of said slidable control member relative to each
other.
Description
This invention relates to fluid pressure-actuated diaphragm pumps.
In such pumps, the diaphragm is stress-compensated during the
pumping or pump delivery stroke, because the pressure of a fluid
medium or air is applied to the diaphragm to move the same against
a pumping head.
A general object of this invention is to provide an improved
fluid-pressure actuated pump capable of pumping effectively against
a negative suction head. To this end, the invention proposes to
utilize the fluid pressure medium as a positive means for effecting
a pressure-assisted return- or pump suction stroke.
More in particular, a main object is to provide a high capacity
double-acting diaphragm pump wherein the pumping stroke of one
diaphragm coincides with the suction stroke of another diaphragm,
and vice versa, and wherein a pressure fluid medium is applied not
only for effecting the pump delivery stroke against a pumping head,
but also for effecting the return- or suction stroke against a
negative suction head, with an effective actuating -- or control
system provided for maintaining the pumping cycle.
Thus, it is a more specific object to provide a control system for
maintaining the pumping cycle, which is simple, positive acting,
and readily accessible as well as easy to adjust, preferably
comprising standard sealed component actuating units that are
individually available, and can be readily assembled and connected
to the pump, and which when in place are readily accessible for
inspection and adjustment.
Another object is that the control system should have simple means
for adjusting the length and frequency of the pumping stroke, even
while the pump is in operation. intake--
To attain the foregoing objectives, the invention provides a
double-acting diaphragm pump which comprises a pair of cooperating
diaphragm pump units or component pumps coaxially arranged and
connected rigidly to one another. Each component pump has a
diaphragm dividing the pump housing into a pumping-- or pump
delivery chamber provided with a valved intake -- or suction
connection and with a valved discharge connection, and a pump
actuating chamber provided with a connection for supplying a fluid
pressure medium, as well as for venting the chamber.
The two component pumps are spaced from each other by an
intermediate or interposed coaxial connecting member rigidly flange
connected to the pumps, with the two actuating chambers facing each
other, and the two pumping chambers facing in opposite
directions.
Each of the diaphragms has a central rigid portion as in the form
of a pair of circular clamping plates. An actuating rod rigidly
interconnects the centers of the two diaphragms, so that the
pumping stroke of the one diaphragm will coincide with the pump
suction -- or pump filling stroke of the other diaphragm, and vice
versa. The connecting rod is longitudinally guided in the
interposed connecting member, and in sealing relationship to either
one of the adjacent pump-actuating chambers.
A control or actuating valve system for moving the diaphragms
through the pumping cycle, communicates with the two actuating
chambers, and has a pressure fluid supply connection. A control
member when moved to one position causes the control system to
admit pressure fluid into the first actuating chamber, while
allowing the second actuating chamber to be vented, and when moved
to the opposite position causes said system to admit pressure fluid
into said second actuating chamber, while allowing the first
actuating chamber to be vented. The movement of the control member
between end positions is effected by the reciprocating movements of
the diaphragm assembly.
In a preferred embodiment, an auxiliary -- or pilot valve unit
having a plug valve member, is mounted on said connecting member of
the pump structure. The pilot plug valve member through air
pressure actuates the plug valve member of a main control valve
unit which in turn admits air pressure to the actuating chambers in
alternation. The pilot plug valve member is reciprocated by the
movements of the diaphragm assembly.
Features of the invention lie in the valve arrangement of the
control system, as well as in the construction and arrangement of
the means for actuating the control system from the reciprocations
of the diaphragm assembly.
Other features lie in the relationship of parts, and in the manner
of their assembly to constitute the pump unit, in such a way that
inspection or replacement of the diaphragm is facilitated, without
the need to disconnect the pump intake -- and pump delivery
connections.
As this invention may be embodied in several forms without
departing from the spirit or essential characteristics thereof, the
present embodiment is illustrative and not restrictive. The scope
of the invention is defined by the appended claims rather than by
the description preceding them, and all embodiments which fall
within the meaning and range of equivalency of the claims are
therefore intended to be embraced by those claims.
FIGS. 1 and 2 schematically illustrate the pumping cycle of a
double-acting diaphragm pump, showing one embodiment of the valve
arrangement in the control system.
FIG. 3 is an enlarged fragmentary side view of the intermediate
section of the pump structure, showing its relationship to the
control system, exemplifying a pair of pusher pins for actuating
the system from the movements of the diaphragm assembly.
FIG. 4 is a further enlarged longitudinal sectional detail view of
one of the pusher pins, including means for sealingly mounting the
same in the associated pump actuating chamber.
FIGS. 5 and 6 schematically illustrate the pumping cycle
corresponding to FIGS. 1 and 2 respectively, showing another
embodiment of the valve arrangement.
FIG. 7 schematically illustrates a pump control system similar to
FIGS. 1 and 2, with other motion transmitting means effective
between the diaphragm assembly and control system.
FIG. 8 is a cross-sectional view taken on line 8--8 in FIG. 7.
FIG. 9 is a side view of the pump structure and pipe assembly,
structurally more fully implemented.
FIG. 10 is an end view taken on line 10--10 of the assembly of FIG.
9.
FIG. 11 is a plan view taken on line 11--11 of the assembly in FIG.
9.
FIG. 12 is a side view of the pump structure, supported on tracks,
illustrating the feature of accessability of diaphragms.
FIG. 13 is an end view taken on line 13--13 in FIG. 12.
A fluid pressure-actuated double-acting diaphragm pump in the sense
of this invention is a pump wherein two pump bodies are rigidly
interconnected in coaxial relationship. A diaphragm divides the
housing of each pump body into a pumping chamber and pump actuating
chamber. An actuating rod interconnects the centers of the two
diaphragms so that, when a fluid pressure medium or air pressure is
admitted alternatingly into the actuating chambers, the pump
filling stroke of one diaphragm will coincide with the pump
delivery stroke of the other diaphragm. A control system timed by
the reciprocations of the diaphragms and actuating rod admits the
fluid pressure medium into the actuating chambers in a manner to
maintain the continuity of the pumping cycle or pumping
operation.
According to the several embodiments herein shown, this
double-acting pump is equipped with a control system wherein a
control member is movable to one position causing the pressure
fluid to be admitted into one of the actuating chambers, while the
other actuating chamber is being vented, and movable to the
opposite position causing the respective flow directions to be
reversed. Motion transmitting means are provided for actuating said
control member by the reciprocations of the diaphragms and
actuating rod.
Referring to the embodiment of FIGS. 1 & 2, the pump structure
itself comprises a pair of pump bodies 10 and 11, and a flanged
connecting member 12 of the length "L" rigidly interconnecting the
pump bodies in coaxial and symmetrical relationship to one another.
The pump housing of the first pump body 10 consists of two housing
sections 13 and 14 bolted together, and having confined between
them a first diaphragm 15 dividing this housing into a pumping --
or pump delivery chamber 16 and a pump actuating chamber 17. The
pumping chamber has an intake connection 18 provided with a check
valve unit 19, and a discharge connection 20 provided with a check
valve 21.
Similarly, the pump housing of the second pump body 11 comprises
two housing sections 22 and 23 having confined between them a
second diaphragm 24 dividing this housing into a pumping chamber 25
and a pump actuating chamber 26. The pumping chamber has an intake
connection 27 provided with intake valve 28, and a discharge
connection 29 provided with check valve 30.
A common pump intake 31 is provided for the two intake connections
18 and 27, while a common pump discharge 32 is provided for two
discharge connections 20 and 29.
Each diaphragm has a central opening 33 provided with an annular
bead or beaded edge portion 34 tightly secured between a pair of
circular clamping plates 35 and 36. The centers of the two pairs of
clamping plates in turn are rigidly interconnected by an actuating
rod 37 the longitudinal reciprocating movement of which is guided
in a pair of bearings 38 and 39 located in the respective ends of
the intermediate connecting member 12. These bearings are provided
with pressure seals 38.sup.a and 39.sup.a respectively, effective
together with a sealing ring 39.sup.b (see FIG. 3) against the pump
actuating air pressure to be applied to the actuating chambers 17
and 26. Each end of the connecting member 12 has a flange
connection 40 with the adjoining pump housing section adjacent to
the respective actuating chamber.
A control system will admit air pressure to the actuating chambers
in alternation, so that the delivery stroke of one diaphragm will
coincide with the pump intake stroke of the other diaphragm.
One embodiment of such a control system for maintaining the pumping
cycle is as follows by reference to FIGS. 1 and 2 illustrating the
respective phases of the pumping cycle:
This control system comprises a main control valve unit V-1
operable to admit air pressure to the respective actuating
chambers, and an auxiliary -- or pilot valve unit V-2 controlling
the operation of the main valve unit, and in turn actuated by the
reciprocation of the diaphragms and actuating rod.
The control valve unit V-1 is in the form of a plug valve unit
having a valve housing 41 operatively connected to the two
actuating chambers by way of pipe conduits 42 and 43 respectively.
This valve housing has an air pressure supply connection 44 at the
center, communicating with a pair of branch passages 44.sup.a and
44.sup.b in the housing. A pair of vent connections 45 and 46 are
provided at the ends of this valve housing. A plug valve member 47
is longitudinally shiftable in the valve housing, so that when
moved to the right hand end position shown in FIG. 1, it closes
branch passage 44.sup.b while admitting air pressure into the left
hand actuating chamber 17 from the supply connection 44 through
passage 44.sup.a in the housing, and from there through pipe 42
into the actuating chamber, all as indicated by the path of flow
arrows A-1. Simultaneously with the closing of branch passage
44.sup.b, the plug valve member opens a vent connection to the
other actuating chamber 26, as indicated by the path of flow arrows
A-2, namely by way of pipe 43 leading to the valve housing, and
vent 46 leading from the valve housing to the atmosphere.
Thus, air pressure will move the diaphragm 15 through the pump
delivery stroke, as indicated by the path of flow arrows A-3
through the discharge check valve unit 21. The concurrent pump
filling stroke of diaphragm 24 is indicated by the path of flow
arrows A-4, through the intake check valve 28.
The main plug valve member 47 when shifted to the FIG. 2 position,
closes the branch passage 44.sup.a, while admitting air pressure
into the right hand actuating chamber 26, supplied from pipe 44
through branch passage 44.sup.b of the valve housing, and then into
the actuating chamber 26, all as indicated by the path of flow
arrows A-5. Simultaneously with the closing of branch passage
44.sup.a the plug valve member opens a vent connection to the left
hand actuating chamber 17, as indicated by the path of flow arrows
A-6, this by way of pipe 42 leading to the valve housing, and vent
45 from the valve housing to the atmosphere. In this condition, air
pressure will move the diaphragm 24 through the pump delivery
stroke, with pump delivery indicated by flow arrows A-7, through
the delivery check valve 30. The concurrent pump filling stroke of
diaphragm 15 is indicated by the path of flow arrows A-8, through
the intake check valve 19.
The foregoing operation of the main plug valve unit V-1 is
controlled by the pilot valve unit V-2 which causes the shifting of
the main plug valve member 47, but which itself is actuated by the
reciprocations of the diaphragms and actuating rod.
The pilot valve unit has a plug valve member 48 extending
co-directional with the actuating rod, and longitudinally shiftable
in a valve housing 49 detachably mounted upon the intermediate
member 12. This valve housing has an air pressure supply connection
50 at the center, communicating with a pair of branch passages 51
and 52, and also has a pair of transfer pipes 53 and 54
communicating with the respective ends of the main control valve
V-1. Furthermore, vent connections 55 and 56 are provided at the
respective ends of pilot valve housing 49.
With the pilot valve unit V-2 thus located between the two valve
bodies, and the valve member 48 thereof extending parallel to the
actuating rod, the shifting of the valve member, according to one
embodiment, is effected by a pair of opposedly arranged pusher pins
57 and 58 engaging respective ends of the valve member. The pusher
pins extending parallel to the actuating rod, are slidable
longitudinally in the wall of the respective pump housings, and are
mounted in pressure-sealed relationship therewith, in a manner
furthermore to be described below and in connection with the detail
showing thereof in FIG. 4.
At the end of each pumping stroke, as effected by the main valve
unit V-1, the clamping plates of a respective diaphragm will
through the associated pusher pin move the pilot valve member
between the end positions shown in FIGS. 1 and 2, thereby
maintaining the continuity of the pumping operation described as
follows:
In the condition of FIG. 1, the actuating rod 37 is shown during
its movement to the left, with both the pilot valve member 48 and
the main valve member 47 in their right hand end position. This
represents the condition where the pilot air supply from pipe 50
acting through passage 51 and transfer pipe 53 has moved the main
plug valve member 47 to the right hand end position. Thus, the main
air supply from pipe 44 through pasage 44.sup.a and tranfer pipe 42
will act upon the left hand diaphragm during the pump delivery
stroke coinciding with the pump intake stroke of the right hand
diaphragm. It will be understood that during this pumping stroke to
the left, the right hand actuating chamber 26 is being vented
through transfer pipe 43 and exhaust 46 of control valve V-1, while
the right hand end of valve V-1 is vented through pipe 54 and
through the pilot valve V-2.
At the end of the stroke to the left (see FIG. 2), the clamping
plate of the right hand diaphragm will engage pusher pin 58 causing
the same to move the pilot valve member 48 to the opposite or left
hand end position shown in FIG. 2, thus admitting pilot air
pressure through pipe 54 to the right hand end of the main valve
housing, which pressure moves the main valve member to its left
hand end position.
This condition reverses the pumping stroke, in that air pressure is
now admitted to the right hand actuating chamber 26 from the main
air pressure supply pipe 44 through the valve and transfer pipe
connection 43. At the end of this movement of rod 37 to the right,
the clamping plate of the left hand diaphragm 15 will through
pusher pin 57 shift the pilot valve member back to its FIG. 1 right
hand end position, thus initiating the next following operating
cycle. It will be understood that during the pumping stroke to the
right in FIG. 2, the left hand actuating chamber 17 is vented
through pipe 42 and through the main valve unit V-1, while the left
hand end of main valve V-1 is vented through pipe 53 and through
the pilot valve unit V-2.
The intermediate portion of the pump in FIG. 3 provides a more
detailed showing of the mounting of the pilot valve unit V-2 in
relation to the associated pusher pins. In this arrangement, a pair
of screw bolts 59 and 60 indicate the manner in which this valve
unit is detachably fixed to the intermediate connecting member 12.
The left hand end E-1 of the pilot plug valve member in this valve
unit through finger 61 contacts an adjustable stop nut 62 on pusher
pin 57. Similarly, the right hand end E-2 of the plug valve member
through finger 63 contacts an adjustable stop nut 64 on pusher pin
58.
The proper timing of the control system is readily attainable by
adjusting the stop nuts 62 and 64 upon the threaded inner end
portions of the respective pusher pins. The effective length of the
pumping stroke is also adjustable by the setting of the stop nuts
on the pusher pins, so that the pump can be operated, for example,
either at higher frequencies of the pumping cycle with a shorter
stroke, or at lower frequencies with a longer pumping stroke.
As previously indicated, the pusher pins 57 and 58 are mounted in
sealing relationship to the respective pump housing sections,
effective against the operating air pressure applied to the
actuating chambers 17 and 26.
A pressure-sealed mounting of the pusher pins is shown in the
enlarged detail FIG. 4. Accordingly, the pusher pin 58 is slidable
in a holder 65 also designated by its length "L-1" This holder
comprises a part 66 of length "L-2" providing a first guide bearing
surface 67 interrupted by a first sealing ring 68, and part 69 in
the form of a flanged bushing fitted into part 66, and providing a
second guide bearing surface 70 interrupted by a second sealing
ring 71. A third sealing ring 72 is effective between parts 66 and
69 and the surrounding flanged member 12. The distance between the
two guide bearing surfaces 67 and 70 defines the length "L-3" of an
annular chamber 73 surrounding the pusher pin. Slidably fitted into
this chamber are a pair of annular shoulder portions 74 and 75
provided upon, or integral with the pusher pin, with a fourth
sealing ring 76 provided between the two shoulder portions. The
assembly of parts 66 and 69 containing the pusher pin is seated
upon a shoulder 77 in the flanged end of member 12, and held in
place by a retainer flange 78 bolted to said flanged end.
In the mounting of this pusher pin, provision is made for the air
pressure acting upon the end face area F-1 of the pusher pin to be
balanced by the air pressure acting through ports 79 upon the
annular area F-2 of shoulder portion 74. Furthermore, an axial bore
80 in the pusher pin communicates through a radial passage 81 with
dead space 73.sup.a of chamber 73, providing a vent connection with
the atmosphere.
When mounted in the manner of FIG. 4 the pusher pins are easily and
smoothly movable in both directions together with the associated
pilot valve member, irrespective of the pressure differential
between the air pressure in the actuating chambers 16 and 25 and
the outer atmosphere.
The air pressure supply for operating both the pump and the valves
of the control system, is represented by the main air pressure
supply line 82. The branch pipe 50 through hand operated valve
50.sup.a provides the air pressure whereby the pilot valve V-2
actuates the main control valve V-1. The branch pipe 44 supplies
the air pressure whereby the main control valve V-1 controls the
operation of the actuating chambers 17 and 26. Aside from a hand
controlled valve 44.sup.c the pipe 44 also has a constant pressure
valve 44.sup.d whereby a desired pressure can be maintained
automatically in the actuating chambers 17 and 26. Changes in the
pumping speed can be effected by changing the setting of the
constant pressure valve.
In another embodiment according to FIGS. 5 and 6, the single
control valve V-1 of FIGS. 1 and 2 is replaced by a pair of
identical control valve units V-3 and V-4, while the arrangement
and operation of the pilot valve unit V-5 are identical to those of
valve unit V-1 in FIGS. 1 and 2.
The control valve unit V-3 comprises a valve housing 82 wherein a
vertical plug valve member 83 has upper and lower enlarged
cylindrical end portions or plugs 84 and 85 respectively,
interconnected by a stem 86. A compression coil spring 87
surrounding the stem is confined between the upper plug 84 and a
shoulder 87.sup.a formed by the valve housing. The upper end of
this valve housing has a pipe connection 88 with pilot valve unit
V-5 (functionally corresponding to pipe 53 in FIGS. 1 and 2), and
cooperating with the upper end of plug valve member 83. The bottom
portion of the valve housing is connected to an air supply pipe 89,
as well as to a transfer pipe 90 leading to the left hand pump
actuating chamber 16. Between these two pipe connections the valve
housing has a bottom vent opening or - connection 91 cooperating
with the lower end of plug valve member 83.
Similarly, valve unit V-4 comprises a valve housing 92 wherein a
vertical plug valve member 93 has upper and lower enlarged
cylindrical end portions or plugs 94 and 95 interconnected by a
stem 96. A compression coil spring 97 surrounding the stem is
confined between the upper plug 94 and a shoulder 98 formed by the
valve housing. The upper end of this valve housing has a pipe
connection 99 with pilot valve unit V-5 (functionally corresponding
to pipe 54 in FIGS. 1 and 2), and cooperating with the upper end 94
of plug valve member 93. The bottom portion of this valve housing
is connected to an air supply pipe 100, as well as to a transfer
pipe 101 leading to the right hand pump actuating chamber 26.
Between these two pipe connections the valve housing has a bottom
vent opening or - connection 102 cooperating with the lower end 95
of plug valve member 93.
The two air supply pipes 89 and 100 are branches of a main air
supply pipe 103 which has an automatic pressure control valve 104
for setting the operating pressure in the two pump actuating
chambers 17 and 26. A third branch pipe 105 supplies the line air
pressure to the pilot valve V-5, and may have a hand operated valve
106.
In the condition of FIG. 5 of the pumping cycle (functionally
corresponding to the condition of FIG. 1), the pilot valve member
48 has been moved to the right hand end position by the clamping
plate of the left hand diaphram 15 acting through pusher pin 5.
Thus, air pressure from pipe 105 acting through pilot valve V-5 and
through pipe 88 will have moved the main valve member 83 against
the spring pressure to the lower end position closing the exhaust
or vent connection 91, while opening a passage 107 allowing air
pressure to pass therethrough into the left hand actuating chamber
17.
At the same time, the opposite right hand actuating chamber 26 is
vented through pipe 101 and passage 108 in valve housing 92, while
valve member 96 is spring-urged into the upper end position closing
the air pressure supply from pipe 100. The upper end of valve
housing 92 is vented through pipe 99 and through the pilot valve
unit V-5.
At the end of the leftward pumping stroke resulting from the
condition of FIG. 5, the clamping plate of the right hand diaphragm
24 will through pusher pin 58 move the pilot valve member 48 to the
FIG. 6 left hand end position, thereby reversing the respective
flow directions in the system, as indicated by the various flow
arrows therein. Consequently, air pressure is admitted from supply
pipe 100 and through passage 108.sup.a in valve unit V-4 to the
actuating chamber 26, causing the diaphragm assembly to be moved to
the right.
At the same time, the opposite left hand actuating chamber 17 is
being vented through pipe 90 and passage 109 in valve unit V-3,
since the spring 87 will have moved the valve member 86 to the
upper end position closing vent connection 88 open through the
pilot valve, while also opening a vent connection from the
actuating chamber 17 through pipe 90 and through passage 109 in
valve unit V-3.
At the end of the pumping stroke resulting from the condition of
FIG. 6, the clamping plate of the left hand diaphragm 15 will again
through pusher pin 57 move the pilot valve member back to the right
hand end position, thus to initiate the next pumping cycle.
In another embodiment of the control valve system as shown in FIGS.
7 and 8, the combination of a main control valve unit V-6 and a
pilot valve unit V-7 is the same structurally and functionally as
the one in FIGS. 1 and 2. The difference lies in the provision of
the motion transmitting means whereby the movements of the pilot
valve member are derived from the diaphragm assembly, and which
require the pilot valve unit V-7 to be mounted on a laterally
overhanging bracket 109.sup.a.
As shown in FIGS. 7 and 8, these motion-transmitting means comprise
an upright stem 100 extending from the actuating rod 111 through a
slot 112 formed in the surrounding connecting member 113, so that
the stem will move back and forth in the slot together with the
actuating rod. A finger 114 extends from the upper end of the stem
horizontally across the pump axis, and across and above the pilot
valve unit V-7.
By engaging a bridge member 115, the finger 114 extending through
horizontal slot 116 will move the pilot valve member between
respective end positions each time the finger 114 reaches a
respective end of the slot. The depending shanks 115.sup.a and
115.sup.b of the bridge member engage respective ends of the valve
member secured by respective set nuts 117 and 118. The length of
the pumping stroke may be varied by the provision of adjustable end
stops or abutment (not shown) on bridge member 115, cooperating
with finger 114. A pair of nuts 119 and 120 on finger 114 maintain
the bridge member in the proper upright position.
FIGS. 9 to 13 further illustrate practical features embodied in the
structural implementation of a pump operable in the manner of the
pumping cycle shown in the schematic FIGS. 1 and 2.
In this practical embodiment, referring to FIGS. 9 and 10, a
horizontal intake pipe 121 extends along one side of the pump at a
low level a distance d-1 below the axis of the pump, and having a
lateral intake opening 122 equidistant from its ends. The left hand
end of this intake pipe has a flanged connection 123 with an elbow
member 124 which has an upwardly directed leg which in turn is
flange-connected to the underside of a first ball valve unit 125. A
lateral neck 126 of this ball valve unit located at the level of
the pump axis, has a flange connection 127 with a first short
horizontal pipe member 128 extending transversely of the pump axis,
and having a horizontal lateral neck concentric with the pump axis
and flange-connected at 129 to the adjoining left hand outer end of
the pump.
The opposite or right hand end of intake pipe 121 is connected to a
second intake ball check valve unit 130 through an elbow member
131, in a manner similar and symmetrical to the first ball check
valve unit 125. A second horizontal transverse pipe member 132
connects this ball check valve 130 with the right hand end of the
pump similar and symmetrical to the opposite or first transverse
pipe member 128.
Along the opposite side of the pump, at a high level a distance d-2
above the pump axis, extends a horizontal discharge pipe 133 having
a lateral discharge opening 134 equidistant from its ends. The left
hand end of this discharge pipe has a flange connection 135 with
the lateral neck 136 of a first discharge ball check valve unit 137
the bottom of which is connected through an elbow member 138 to the
first transverse horizontal pipe member 128. The opposite or right
hand end of the discharge pipe has a flange connection 139 with the
lateral neck 140 of a second discharge ball check valve unit 141
the bottom of which in turn through an elbow member 143 is
connected to the second transverse horizontal pipe member 132.
The pump unit shown in FIGS. 9 to 11 is mounted and supported in a
practical manner illustrated in FIGS. 12 and 13, whereby the
inspection of the two diaphragms is greatly facilitated.
To that end, the pump unit is supported upon a pair of parallel
supporting beams or steel profiles shown in the form of channel
irons 142 and 143. For example, in order to inspect the diaphragm
in the right hand pump body, a simple procedure is merely to
disconnect the quick-detachable couplings 144 and 145, as well as
to disconnect the flanges 146 of the associated pump housing
sections 147 and 148. The assembly of parts thus disconnected are
to the right of the severing lines X--X, Y--Y and Z--Z indicated in
the plan view of FIG. 11. This assembly may then be slid outwardly
away while supported on the beams, thereby exposing the diaphragm
149 in the manner illustrated in FIGS. 12 and 13.
The control valve unit V-1 in FIGS. 1 and 2 is available from Mac
Valves Inc., Detroit, Michigan, Model No. 2733. The pilot valve V-2
in the same embodiment is available from Mac Valves Inc., Detroit,
Michigan, Model No. 1808-1-08.
The two identical air pressure actuated control valve units V-3 and
V-4 in FIGS. 5 and 6 are available from Mac Valves Inc., Detroit,
Mich., Model No. 4444.
I claim:
* * * * *