U.S. patent number 3,565,289 [Application Number 04/762,890] was granted by the patent office on 1971-02-23 for self-proportioning fluid dispensing apparatus.
This patent grant is currently assigned to A. O. Smith Corporation, Milwaukee, WI. Invention is credited to Charles D. Erickson.
United States Patent |
3,565,289 |
|
February 23, 1971 |
SELF-PROPORTIONING FLUID DISPENSING APPARATUS
Abstract
This disclosure relates to gasoline dispensing including an
intermediate grade pump interconnected to both the premium grade
storage tank and the regular grade storage tank through a blending
valve. The blending valve includes a pair of flow passageways. A
common throttling valve inversely varies the flow through the two
passageways. A manual control valve is provided to adjustably and
inversely set the cross-sectional areas of the flow passageways.
The throttle valve is connected to a hydraulic diaphragm actuator
having pressure chambers to the opposite sides of a movable
diaphragm. Signal pressure lines connect the passageways between
the two valves to corresponding pressure chambers to position the
diaphragm and throttling valve to establish equal pressures in the
passageways.
Inventors: |
Charles D. Erickson (Erie,
PA) |
Assignee: |
A. O. Smith Corporation, Milwaukee,
WI (N/A)
|
Family
ID: |
25066302 |
Appl.
No.: |
04/762,890 |
Filed: |
September 26, 1968 |
Current U.S.
Class: |
222/57; 222/134;
137/100 |
Current CPC
Class: |
G05D
11/003 (20130101); B67D 7/741 (20130101); B67D
2007/746 (20130101); Y10T 137/2521 (20150401) |
Current International
Class: |
B67D
5/56 (20060101); G05D 11/00 (20060101); B67d
005/56 (); G05d 011/02 () |
Field of
Search: |
;222/134,57
;137/100 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Robert B. Reeves
Assistant Examiner: Frederick R. Handren
Attorney, Agent or Firm: Andrus, Sceales, Starke &
Sawall
Claims
I claim:
1. In a gasoline dispensing system having three dispensers for
dispensing three grades of gasoline from a first storage tank
connected to one dispenser and a second tank connected to a second
dispenser, the third dispenser being connected to both tanks, a
fluid mixer comprising: a mixer body having a pair of inlets; a
common outlet connecting to the third dispenser and defining a
passageway from each said inlet to the common outlet; a throttling
valve means including a valve body slidably disposed laterally in
said mixer body and including a valve seat in each said passageway
in axial alignment with said valve body, for inversely varying the
opening through said passageways; a control valve assembly having a
control valve body slidably disposed laterally in said mixer body
intermediate said throttling valve means and said outlet, and a
control valve orifice disposed in each said passageway with the
ends of said control valve body terminating at said control
orifices; selector means for sliding said control valve body across
said control valve orifices; and actuator means being responsive to
flow through said control valve orifices for operating said
throttle valve means to equalize pressure in said passageways.
2. The gasoline dispensing system of claim 1 wherein said selector
means has a manually adjustable means connected to said control
valve body for determining the mixture of said third grade, and
said actuator means is a pressure actuator having a movable member
and a pair of pressure input chambers to the opposite sides of said
movable member, each chamber communicating with one said
passageway, said actuator means having a connector from said
movable member to said throttle means to position said valve member
in accordance with the relative pressure levels in said
passageways.
3. The fluid mixer of claim 1 and including check valve means for
opening and closing said passageways in response to pressure in
said passageways.
4. A fluid dispensing apparatus for mixing a first and second
liquid in varied proportions, comprising; a body having a central
portion and defining a pair of flow passageways to either side of
said central portion, said passageways having orifices at said
central portion, the orifices being aligned on a first lateral axis
of said body; a throttle valve having a valve body slidably
disposed in said central portion along said lateral axis, the valve
body extending outward into said passageways to said orifices; a
control means for inversely varying the flow through said
passageways, said control means having a control member body
slidably disposed through said central portion on a second lateral
axis upstream of said throttle valve, said control member being
slidable into said passageways to inversely restrict the flow area
of said passageways; and pressure actuator means connected to said
throttle valve and communicating with the passageways intermediate
said first and second axes, for operating said throttle valve to
equalize pressures in said passageways.
5. The fluid dispensing apparatus of claim 4 wherein said throttle
valve includes a positioning shaft extending outwardly from one end
through one of said orifices and a balancing shaft stub extending
from the opposite end through the second of said orifices.
6. The fluid dispensing apparatus of claim 4 wherein the ends of
said throttle valve are frustoconically shaped to produce a smooth
proportional change in the orifice opening with movement of the
valve member.
7. A fluid dispensing apparatus for delivery of different ratios of
a first and second liquid through a pair of flow passageways,
comprising: a body portion defining said passageways; valve means
in said flow passageways for inversely opening and closing said
passageways; control means disposed in spaced relation from said
valve means for varying the flow resistance of said passageways,
said control means including a control shaft disposed for movement
laterally of said passageways with the ends of said control shaft
terminating in said passageways and inversely varying the
cross-sectional flow areas thereof; an actuator having a diaphragm
and a pair of opposed pressure input means disposed to the opposite
sides of said diaphragm, said input means connecting respectively
to the passageways between said control shaft and said valve means;
means connecting said diaphragm to said valve means; said control
shaft having an axial end opening; and adjusting means including a
positioning rod threaded into said axial opening and rotatably
mounted in said body portion for axially moving said control shaft
relative to said passageways; the inner end of said axial opening
having a vent to prevent trapping of fluid within said opening.
Description
This invention relates to a dispensing system employing a blending
valve means to establish a mixture of at least two materials and
particularly to a gasoline dispensing system having means to
dispense a selected blend of two standard grades of gasolines.
Gasoline has been generally marketed under either of two grades or
octane ratings respectively identified as "regular" gasoline and
"premium" gasoline. The recent development of automobiles has made
it desirable to provide another octane rating intermediate the
conventional regular and premium grade. Dispensing devices have
been suggested which are interconnected to the storage tanks for
both the regular and the premium gasolines. A manual adjustable
control is provided to permit the selection of either regular or
premium gasolines or some combination of such products. Such
devices require relatively complicated mechanisms as each grade or
blend which is dispensed must also be interconnected into the
computer mechanism to provide a proper visual volume registration
and visual cost registration in accordance with the volume
dispensed. Individual meters for each gasoline are normally
provided within each pump and interconnected through a suitable
integrating means to provide a suitable register output in
accordance with the quantities of the two basic gasolines
dispensed. Such systems are relatively expensive to construct and
to maintain.
The present invention is directed to a simplified and relatively
inexpensive dispensing system wherein completely separate
dispensing units which may be of identical single product
dispensing construction are provided for dispensing each of the
several grades of gasoline. Thus, the system for a service station
may include a "regular" dispensing pump, a "premium" dispensing
pump and an intermediate "of blend" dispensing pump of the same
construction. The intermediate grade pump is interconnected to both
the premium grade storage tank and the regular grade storage tank
through a separate adjustable blending valve which is manually
adjustable to establish a desired blend. The register of the
intermediate grade pump is then set at a fixed price in accordance
with the usual price adjustment of a pump.
In a particularly novel aspect of the present invention, the
blending valve includes a pair of flow passageways from the
individual liquids to a common or blend outlet. A common throttling
valve means inversely varies the flow through the two passageways.
A manual control valve means is provided to adjustably and
inversely set cross-sectional areas of the flow passageways. The
relative positions of the two valve means establishes a control
pressure condition in the two flow passageways which is coupled
through a suitable actuator to automatically set and hold the
throttling valve in a desired position.
As applied to a service station pump, the blending valve is
provided with a pair of inputs connected respectively to the
premium grade storage tank and the regular grade storage tank and a
common output interconnected to the two passages through a suitable
check valve construction. The throttle valve means or structure is
adapted to inversely vary the flow passageway from the two inlets
to the single outlet. The throttle valve means is connected to a
hydraulic actuator such as a diaphragm actuator having pressure
chambers to the opposite sides of a movable diaphragm. The control
valve means includes an adjustable means for inversely varying the
apertures or openings immediately adjacent the check valves and
correspondingly varying the pressure in the flow passageways to the
discharge sides of the throttling valve means. The passageways
between the respective throttling valve means and control valve
means defines a pair of pressure chambers or cavities. Conduit
means interconnect each of such pressure cavities with a
corresponding pressure chamber of the hydraulic actuator to
establish balancing pressures on the opposite sides of the
diaphragm.
If the apertures are set for essentially equal flow rates,
corresponding pressures will be established in the pressure
cavities and transmitted through the passageways to the
corresponding chambers of the hydraulic actuator. The movement of
the hydraulic actuator will then position the throttle valve to an
established equal flow. If the apertures are adjusted to increase
the flow through the one passageway and correspondingly decrease
the flow through the opposite passageway, corresponding pressure
signals will be transmitted to the hydraulic actuator to move the
throttle valve means and adjust the flow through the two inlets
until equal pressures are established in the pressure cavities and
in the chambers of the hydraulic actuator.
Applicant has found that accurately proportioned flow rates can
readily be maintained through the respective flow passages by
controlling the restriction ratio of the apertures.
In a particularly novel and satisfactory system, the check valves
and apertures are mounted in laterally spaced coplanar relationship
to define a pair of parallel paths within the valve to a common
outlet. Each of the check valves is preferably provided with a
thermal release control to prevent excessive pressure buildup
downstream of the blender assembly. A valve rod is slidably mounted
in the body portion between the two apertures. An adjustment shaft
is threaded into the one end of the aperture adjusting valve rod
and rotatably fixed within the housing. Rotation of the shaft
results in longitudinal movement of the valve rod and the relative
ratio of the opening of the apertures. Suitable lock means may be
provided to lock the valve rod in place.
A throttle valve includes a valve member slidably mounted within
the wall between the parallel paths. The opposite ends of the valve
member cooperates with valve orifices in the respective parallel
paths to throttle the flow therethrough. Further, the ends of
throttle valve member are specially shaped to provide direct
proportional changes in the orifice area with linear movement of
the valve member and the diaphragm of the hydraulic actuator to
prevent abrupt changes in flow with a resulting hunting or pressure
oscillating condition.
It has been found that the present invention provides a simple and
inexpensive system for the dispensing of gasoline products or the
like.
The drawings furnished herewith illustrate the best mode presently
contemplated by the inventor for carrying out the subject matter of
this invention and clearly discloses the above advantages and
features as well as others which will be readily understood from
the following description.
In the drawings:
FIG. 1 is a diagrammatic illustration of a gasoline dispensing
system constructed in accordance with the present invention;
FIG. 2 is an enlarged vertical section through a blending valve
assembly constructed in accordance with the present invention;
FIG. 3 is a top elevational view of the valve assembly shown in
FIG. 2.
Referring to the drawing and particularly to FIG. 1, a gasoline
dispensing system is shown employing three separate dispensing
pumps 1, 2 and 3 for respectively dispensing a "premium" grade
gasoline, a "regular" grade gasoline and an "intermediate" or
"blend" grade gasoline respectively. The "premium" grade pump 1 is
connected directly by a conduit or line 4 to a "premium" grade
storage tank 5. The "regular" grade dispensing pump 2 is similarly
connected by a conduit 6 directly to a "regular" grade storage tank
7. The "blend" grade dispensing pump 3 is interconnected through a
blending valve 8, constructed in accordance with the teaching of
the present invention, to both the premium grade line 4 and the
regular grade line 6. The blending valve assembly 8, which is more
clearly shown in a particularly novel construction in FIGS. 2 and
3, is adapted to blend any predetermined ratio of the premium grade
and the regular grade gasolines to produce an intermediate octane
rated gasoline which can be sold for an intermediate price. Each of
the three pumps 1, 2 and 3 is constructed and interconnected to
discharge a single product in contrast to the approach which has
heretofore been suggested wherein each of the pumps is individually
interconstructed with an adjustable means to selectively discharge
any one of a plurality of different octane ratings. The dispensing
pumps 1, 2 and 3 therefore may be of any well-known or any other
construction such as presently widely employed in the dispensing of
gasoline. Generally, each pump 1, 2 and 3 includes a register 9
having gallonage display portion 10 and a total cost display
portion 11 driven from a single meter 12. A per gallon display
portion 13 is also provided. An internal adjustment of any
well-known construction permits varying of the setting of the
display portion 13 with an automatic adjustment of the total cost
display portion meter coupling ratio. As the structure and
operation of the pumps 1, 2 and 3 are well-known, no further
description thereof is given.
Referring particularly to FIGS. 2 and 3, the illustrated blending
valve assembly 8 includes a valve body 14 having a first inlet 15
interconnected to the premium line 4 and a second adjacent valve
inlet 16 interconnected to the regular grade line 6. A head 17 is
bolted or otherwise suitable interconnected to the opposite end of
the valve body 14 with a sealing gasket 18 disposed therebetween to
maintain a fluidtight connection. The head 17 is generally
cup-shaped and when assembled with the valve body 14, defines an
output chamber 19 with an outlet 20 centrally formed therein. The
output is similarly connected by corresponding check valves 21 and
22 to a pair of similar flow passageways for the two basic grades
of gasoline.
The pair of parallel flow passageways leading from the respective
inlets 15 and 16 to the common outlet 20 are essentially identical.
Consequently, the passageway for the valve inlet 15 interconnected
to the premium grade line 4 is described in detail with the
corresponding elements of the opposite passageway identified by
similar primed numbers for purposes of simplicity and clarity of
explanation.
The valve inlet 15 extends inwardly to a throttling valve unit 23
including an orifice 24 having an axis normal to the axis of the
valve inlet 15. A pressure cavity or chamber 25 is provided to the
discharge side of the throttling orifice 24. The cavity 25 is
interconnected to the common output chamber 19 in the head 17 of
the valve by a control opening or aperture 26 forming a part of a
control valve unit 27.
An aperture control member 28 is slidably mounted within the valve
body 14 between the two valve pressure cavities 25 and 25' and
immediately adjacent the apertures 26 and 26'. The lateral
displacement of the member 28 from the centered position shown
varies the flow aperture cross-sectional area of the apertures 26
and 26' in an inverse manner. This in turn is reflected in a
variation in the pressure in the pressure cavities 25 and 25'. The
two pressures of the two parallel flow passageways are transmitted
to a hydraulic diaphragm actuator 29 interconnected to position the
throttling valve unit 23 in such a manner as to produce a
predetermined flow ratio of the premium grade gasoline and the
regular grade gasoline to outlet 20.
More particularly, in the illustrated embodiment of the invention,
the main throttle valve unit 23 is provided with the circular
orifices or openings 24 in a lateral wall 30 between cavity 25 and
inlet 15. A valve member 31 is slidably disposed within an opening
in the center of the valve body 14 with the end aligned with
orifice 24 and constructed as a frustoconical element 32. A pair of
annular seals 33 are disposed within a central recess in the valve
member 31 and slidably engage the adjacent wall of the valve body
to provide a liquidtight seal preventing interchange of liquid
between the two inlets. A positioning rod or shaft 34 extends
through the valve member 31 and is pinned or otherwise secured
thereto as at 35. The one end of shaft 34 projects laterally
through the throttle orifice 24 and the pressure cavity 25 into the
hydraulic actuator 29. The opposite end of the shaft 34 projects
from the valve member 31 in the opposite direction through the
throttle orifice 24' and the pressure cavity 25'. Consequently,
with the valve member 31 centrally located within the body, the
throttling valve ends 32 and the projection of the shafts 34
through the orifices 24 and 24' provide a corresponding flow
opening into the two pressure cavities 25 and 25'.
The opposite ends of the valve member 31 terminate in the
frustoconical valve ends 32 and 32' aligned with the valve orifices
24 and 24' respectively. Movement of the valve member 31 toward and
away from the corresponding orifices directly varies the orifice
area and thereby the flow path. The tapered construction results in
proportional linear variation in the orifice area in accordance
with the linear movement of the shaft 34 and attached member
31.
The hydraulic actuator 29 for shaft 34 is a known diaphragm-type
unit having a cup-shaped base 36 bolted or otherwise interconnected
to the side of the valve body 14 immediately adjacent the pressure
chamber 25. The base 36 includes a hub 37 extending into an opening
to the premium grade passageway 25 and defining a supporting
bearing for the valve shaft 34. The hydraulic actuator 29 includes
an outer cup-shaped cover 38 secured to the base with a diaphragm
39 spanning the chamber and clamped completely about the peripheral
edge thereof between the mating portions of the base 36 and cover
38.
The shaft 34 extends through hub 37 and is clamped to the diaphragm
39 by a pair of opposed discs 40 and 41 on the opposite sides of
the diaphragm. The position of the diaphragm 39 directly controls
the position of the valve shaft 34 and the valve member 31. The
diaphragm 39 defines a first pressure chamber 42 to one side of the
diaphragm and a second pressure chamber 43 to the opposite side of
the diaphragm.
The first pressure chamber 42 is interconnected to the immediately
adjacent flow passageway or cavity 25 by a small opening 44
provided in the hub or bearing portion 37 of the base 36. The
corresponding side of the diaphragm 39 is therefore subjected to
the pressure established in the pressure cavity 25 by the flow of
fluid through the throttle valve orifice 24 and the aperture
26.
The opposite pressure cavity 25' of the blending valve assembly is
interconnected by a pressure conduit 45 to the opposite chamber 43
of the hydraulic actuator 29 to apply the corresponding pressure to
the other side of diaphragm 39. The hydraulic actuator diaphragm 39
is therefore positioned in accordance with the relative pressures
in the cavities 25 and 25' which in turn are controlled by the
setting of the hydraulic valve member 31 and the control valve
member 28.
In the illustrated embodiment of the invention, the aperture
control member 28 is a cylinder slidably disposed within the valve
body 14 immediately outwardly of the throttle valve member 31 and
projecting laterally into both of the pressure cavities 25 and 25'
with the member 28 centrally located as shown in FIG. 2. An annular
seal 46 is disposed within an encircling recess in one end of the
cylinder to seal the slide opening and prevent interchange of fluid
between the two cavities. A tapped opening 47 is provided in the
right end of the member 28 coaxially of the member. An adjustment
shaft 48 threads into the tapped opening and extends outwardly
through an opening in the valve body 14. A threaded plug 49 is
secured within the opening and compresses a sealing gasket 50 to
seal the opening. The shaft 48 extends through the plug 49 which is
sealed by suitable O-ring seal 51. Snap rings 52 are similarly
attached in corresponding recesses in the shaft 48 to the immediate
end faces of the plug 49. This permits rotatable motion of the
shaft 48 but prevents axial movement thereof.
The periphery of the cylinder 28 is provided with a longitudinal
guide groove 53 in the surface immediately adjacent the exterior
wall of the valve body 14. A small guide pin 54 is threaded through
an appropriate opening in the valve body and projects into the
groove 53 to prevent rotation of the cylinder while permitting
axial or longitudinal movement within the valve body.
A small bleed passageway 55 interconnects the inner end of the
tapped opening to the groove to bleed any fluid trapped under the
adjusting screw back to the corresponding right-hand passageway or
cavity 25' in the valve body 14.
Rotation of the shaft 48 therefore results in the longitudinal
movement of the cylinder 28 to thereby vary the positioning of the
opposite ends of the member 28 with respect to the pressure
cavities. This in turn establishes a variable aperture 26 and 26'
at the discharge ends of the pressure cavities 25 and 25'. If the
apertures 26 and 26' are set for equal flow rates and the throttle
valve member 31 is centrally located, equal pressures will be
established in the two pressure cavities 25 and 25' and apply
corresponding equalized pressures to the actuator chambers 42 and
43 on the opposite side of the diaphragm 39. This will hold the
throttle valve in the central location to maintain the equal flow
rate.
If the adjusting or control shaft 48 is rotated to move the
cylinder 28 to the right, as viewed in the drawing, it will provide
for an increased flow of the premium grade product through the left
passageway and cavity 25 in FIG. 2 of the drawing and a
corresponding reduced flow through the opposite passageway and
cavity 25'. The increased flow results from a decreased pressure in
the premium pressure cavity which is transmitted through the small
passageway to the diaphragm. Simultaneously the opposite pressure
cavity establishes an increased pressure which is applied to the
opposite side of the diaphragm via the pressure conduit. This will
tend to shift the diaphragm, the attached shaft and the valve body
to the right thereby increasing the opening of the premium grade
orifice and closing the regular grade orifice flow in a
corresponding linear manner. This tends to reverse the pressure
conditions in the two passageways. The differential pressure thus
is applied to the actuator until the valve body of the throttling
valve is set to establish a predetermined flow ratio, at which flow
equal pressures are established in the two pressure cavities 25 and
25' and applied to the diaphragm 39. At this point, the diaphragm
39 and the attached valve member 31 are held in a corresponding
position to maintain the desired flow ratio. The position of
control shaft 48 and member 28 therefore determine the proportion
of the flow through the valve body and thereby the final blend.
In the illustrated embodiment of the invention, a worm 56 is
secured to the outer end of the control shaft 48. A pinion 57 is
rotatably mounted within a suitable bracket 58 projecting outwardly
of the valve body 14 and located to mesh with the worm 56. An
adjusting dial 59 is provided to permit manual adjustment of the
position of the cylinder 28. Suitable indicia may be provided on
the adjusting dial to allow convenient positioning for a desired
flow ratio.
The pressure cavities 25 and 25' are connected to the common outlet
chamber 19 by the similar check valves 21 and 22. In the
illustrated embodiment of the invention, each check valve includes
a resilient faced valve member 60 secured to a hollow stem 61 which
is journaled in a hub 62 in the head 17. A coil spring 63 encircles
the hub 62 and resiliently holds the valve member 60 in engagement
with a suitable valve seat 64 encircling the aperture 26. A small
thermal relief valve 65 is supported within the hollow stem 61 of
the check valve 21. The relief valve 65 prevents excessive pressure
buildup downstream of the blending valve assembly 8.
The operation of the blending valve assembly 8 is controlled by the
relative pressure drops created by the adjustable apertures 26 and
26' and the adjustable throttle valve orifices 24 and 24'. The
adjustable apertures 26 and 26' are inversely varied by the manual
positioning of the cylindrical member 28. The dispensing pump 3 is
turned on to establish pressurized flow through the valve assembly
8, causing the check valves 21 and 22 to open and discharge a
blended liquid from the pump. The flow passing through the throttle
valve orifices 24 and 24' and the apertures 26 and 26' creates
pressure conditions within the cavities 25 and 25' related to the
flow. The amount of pressure available to each cavity is directly
related to the amount of flow through the adjacent aperture. With
the manually set control cylinder 28 and the throttle valve member
31 centrally located, identical flow passageways are created and
consequently corresponding pressure conditions exist in cavities 25
and 25' which pressures are applied to the opposite sides of the
diaphragm 39 of the hydraulic actuator 29. The equal flow is
established and maintained. If the ratio is to be varied, the
adjusting dial 59 and attached shaft 48 are rotated to move the
cylindrical member 28 in a corresponding direction. For example,
movement of the cylindrical member to the left, closes the aperture
26 for the premium grade gasoline and correspondingly increases the
aperture 26' for the regular grade gasoline. This will permit
greater flow of regular gasoline and reduce flow of premium
gasoline. The reducing or closure of the premium grade gasoline
aperture or opening will increase the pressure in the cavity 25 and
apply a corresponding signal to the one chamber 42 of the hydraulic
actuator 29. Simultaneously the opening of the aperture 26' for the
regular grade gasoline reduces the pressure in the cavity 25' and
transmits the reduced pressure via the pressure conduit 45 to the
opposite pressure chamber 43 of the hydraulic actuator 29. As a
result, the throttle valve member 31 moves to the left in the
illustrated embodiment of the invention to throttle the premium
grade gasoline flow and increase the regular gasoline flow. The
closing of the premium grade gasoline throttle valve orifice 24
decreases the pressure in the cavity 25 as a result of the greater
drop across the throttling valve orifice 24. Simultaneously, the
opening of the throttle valve orifice 24' for the regular grade
gasoline increases the pressure of cavity 25'. The throttle valve
member 31 is moved until a new pressure balance is obtained in the
hydraulic actuator 29 at which time the valve member 31 is held
stationary to provide the desired proportional flow.
The flow from the valve assembly 8 is discharged through the pump 3
and particularly meter 12 which drives the pump 3 to record the
gallonage and total cost in accordance with the usual system of
gasoline dispensing.
The present invention thus provides a simplified means for
providing a multiple or dispensing of a blended products as well as
the basic liquid products and the like.
Various modes of carrying out the invention are contemplated as
being within the scope of the following claims particularly
pointing out and distinctly claiming the subject matter which is
regarded as the invention.
* * * * *