US20130287600A1 - Direct Volume-Controlling Device (DVCD) for Reciprocating Positive-Displacement Pumps - Google Patents

Direct Volume-Controlling Device (DVCD) for Reciprocating Positive-Displacement Pumps Download PDF

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Publication number
US20130287600A1
US20130287600A1 US13/827,136 US201313827136A US2013287600A1 US 20130287600 A1 US20130287600 A1 US 20130287600A1 US 201313827136 A US201313827136 A US 201313827136A US 2013287600 A1 US2013287600 A1 US 2013287600A1
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US
United States
Prior art keywords
accumulator
volume control
control device
housing
chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US13/827,136
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English (en)
Inventor
Andrew C. Elliot
Don Matherne, JR.
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Checkpoint Fluidic Systems International Ltd
Original Assignee
Checkpoint Fluidic Systems International Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Checkpoint Fluidic Systems International Ltd filed Critical Checkpoint Fluidic Systems International Ltd
Priority to US13/827,136 priority Critical patent/US20130287600A1/en
Assigned to CHECKPOINT FLUIDIC SYSTEMS INTERNATIONAL, LTD. reassignment CHECKPOINT FLUIDIC SYSTEMS INTERNATIONAL, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MATHERNE, DON G., JR., ELLIOTT, ANDREW C.
Priority to SG11201406870RA priority patent/SG11201406870RA/en
Priority to GEAP201313633A priority patent/GEP20166468B/en
Priority to IN9577DEN2014 priority patent/IN2014DN09577A/en
Priority to JP2015509185A priority patent/JP2015522736A/ja
Priority to MX2014012861A priority patent/MX2014012861A/es
Priority to CN201380030737.1A priority patent/CN104471244A/zh
Priority to CA2871588A priority patent/CA2871588A1/fr
Priority to AU2013251424A priority patent/AU2013251424B2/en
Priority to EA201491900A priority patent/EA201491900A1/ru
Priority to BR112014026688A priority patent/BR112014026688A2/pt
Priority to PCT/US2013/038440 priority patent/WO2013163560A1/fr
Priority to EP13782465.2A priority patent/EP2855932A4/fr
Priority to NZ701890A priority patent/NZ701890A/en
Publication of US20130287600A1 publication Critical patent/US20130287600A1/en
Priority to IL235295A priority patent/IL235295A0/en
Priority to MA37559A priority patent/MA37559B1/fr
Priority to ZA2014/08650A priority patent/ZA201408650B/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B13/00—Pumps specially modified to deliver fixed or variable measured quantities
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/02—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with screw-spindle
    • F16K1/06—Special arrangements for improving the flow, e.g. special shape of passages or casings
    • F16K1/08—Special arrangements for improving the flow, e.g. special shape of passages or casings in which the spindle is perpendicular to the general direction of flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/02—Check valves with guided rigid valve members
    • F16K15/025—Check valves with guided rigid valve members the valve being loaded by a spring
    • F16K15/026—Check valves with guided rigid valve members the valve being loaded by a spring the valve member being a movable body around which the medium flows when the valve is open
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/18—Check valves with actuating mechanism; Combined check valves and actuated valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K39/00—Devices for relieving the pressure on the sealing faces
    • F16K39/02—Devices for relieving the pressure on the sealing faces for lift valves
    • F16K39/024—Devices for relieving the pressure on the sealing faces for lift valves using an auxiliary valve on the main valve

Definitions

  • the present invention relates to pumps and fluid injection systems.
  • Positive displacement pumps are used to deliver or “dose” a predictable, precise amount of fluid in a repeatable fashion.
  • positive displacement pumps use the reciprocating motion of a solid object such as a plunger, piston, or diaphragm to withdraw fluid from a continuous source during a suction stroke, then to displace the withdrawn fluid during a discharge stroke.
  • a suction check valve that allows flow in only one direction, towards the pump.
  • a discharge check valve be present to direct flow away from the pump and towards the intended recipient process and to prevent any fluid from returning to the pump from the recipient process during its operation.
  • FIG. 1 illustrates a positive displacement pump
  • FIG. 2 illustrates a Direct Volume Controlling Device (DVCD) position on the pump of FIG. 1 .
  • DVCD Direct Volume Controlling Device
  • FIG. 3 is a perspective view of one embodiment of a DVCD.
  • FIG. 4 is an exploded view of the DVCD illustrated in FIG. 1 .
  • FIG. 5 is a cross-sectional view of the DVCD illustrated in FIG. 1 in a first position.
  • FIG. 8 is a cross-sectional view of the DVCD illustrated in FIG. 1 in a fourth position.
  • FIG. 9 is a cross-sectional view of the DVCD illustrated in FIG. 1 in a fifth position.
  • FIG. 10 is a cross-sectional view of the DVCD illustrated in FIG. 1 in a sixth position.
  • FIG. 11 is a perspective view of a second DVCD embodiment.
  • FIG. 12 is a cross-sectional view of the DVCD illustrated in FIG. 11 .
  • FIG. 13 is a perspective view of a third DVCD embodiment.
  • FIG. 14 is an exploded view of the DVCD embodiment shown in FIG. 13 .
  • FIG. 15 is a cross-sectional view of the DVCD illustrated in FIG. 13 .
  • FIG. 16 is a cross-sectional view of the DVCD illustrated in FIG. 13 showing the fluid path.
  • FIG. 1 illustrates one type of conventional positive displacement pump assembly, with a “driver” portion 100 and a pump “head” assembly 105 (also referred to as a “wetted end” or a “fluid end,” among other terminologies).
  • the head assembly 105 is the part of the pump assembly that comes into contact with the fluid to be pumped.
  • the pump head assembly 105 illustrated is only one of a multitude of pump head designs that are employed in positive displacement pump systems.
  • the driver portion 100 of the pump assembly is also only one of several designs which are employed in reciprocating positive displacement pumps.
  • the driver could be, and often is, energized by pressurized gas (pneumatic), in which a piston reciprocates over time driven by alternating gas pressure (see for example the pump in U.S. Pat. No.
  • the driver could also be electrical, for example where a rotating motor utilizes mechanical means to convert that rotational motion to reciprocating motion.
  • the driver could also be powered by a hydraulic fluid or any other energy source, in which that energy is ultimately a repeatable, alternating, reciprocating motion.
  • the driver type shown in FIG. 1 is pneumatic, for illustrative purposes only and many different types of convention or future developed drivers could be employed with the present invention.
  • FIG. 1 a plunger-type pump head 105 is depicted.
  • a driver acts upon a plunger in a linear reciprocating (back and forth) motion.
  • the plunger is connected to the pump head utilizing a seal, which is designed to create a barrier between the environment and a chamber inside the head, isolating the chamber hermetically.
  • the seal allows the plunger to move slidably up and down in a chamber while maintaining a tight hermetic seal. As the plunger partially, but not completely, withdraws from the chamber inside the head, it creates suction (negative pressure) inside the chamber.
  • FIG. 1 a plunger-type pump head 105 is depicted.
  • a driver acts upon a plunger in a linear reciprocating (back and forth) motion.
  • the plunger is connected to the pump head utilizing a seal, which is designed to create a barrier between the environment and a chamber inside the head, isolating the chamber hermetically.
  • the seal allows the plunger to move slid
  • FIG. 1 also shows a suction check valve 106 attached to head portion 105 .
  • check valve 106 When check valve 106 is attached to a fluid source, fluid is drawn into the pumping chamber, filling the expanding space created by the withdrawing plunger. At a certain point, the plunger (by virtue of the reciprocating motion of the driver) ceases to withdraw and begins to descend back into the chamber. This action raises the pressure in the chamber, causing suction check valve 106 to close, and forcing the fluid to exit the chamber via a discharge check valve 107 .
  • a second, very common type of pump head is referred to as a “diaphragm” type pump head.
  • This pump head utilizes hydraulic fluid pressure, generated by reciprocating motion of a plunger, to act on one side of a diaphragm or a sandwich of diaphragms. In this type of head design, the fluid being pumped is acted upon by the opposite side of the diaphragm or diaphragm assembly.
  • Other types of pump heads utilize alternative means of controlling, actuating, and pumping fluid, e.g., a bellows type pump head. All such pump heads, and potentially many other conventional and future developed pump heads, may be used in conjunction with the present invention.
  • FIG. 2 depicts a pump assembly similar to FIG. 1 , but with the substitution of the discharge check valve 107 with one embodiment of the present invention, the Direct Volume Controlling Device (DVCD) 1 .
  • DVCD Direct Volume Controlling Device
  • FIG. 3 better illustrates the external features of this embodiment of the DVCD 1 with it removed from the pump assembly.
  • FIG. 3 shows DVCD 1 's housing 2 , end cap 7 , inlet 3 , outlet 4 , and a volume adjustment mechanism, which in the illustrated embodiment is control knob 35 , including graduated indicator ring 36 .
  • Inlet 3 may include any conventional means for connecting to a pump head, for example, a threaded nipple 70 through which inlet 3 is formed.
  • outlet 4 may have a threaded surface or other connection means allowing for attachment to a suitable pipe or tubing from the DVCD 1 to the process requiring fluid to be metered or pumped to it.
  • the threaded portion at the bottom could be a tapered pipe thread or any other conventional or future developed mechanical means.
  • attachment to the pump head is via a straight thread with a sealing means (e.g., an o-ring type seal positioned in seal grove 39 ) to seal against the pump head.
  • the threaded portion proximate to outlet 4 could be any type of thread to correspond with the process for which it is to be used, or it could also be made to accept low pressure “swaged” tubing fittings, or medium or high pressure “coned and threaded” connections, for example.
  • the internal components of DVCD 1 may be better understood by viewing FIG.
  • FIG. 5 illustrates how threads 38 on the upper end of housing 2 will engage mating threads on end cap 7 with o-ring 8 forming a seal between these elements.
  • internal chamber 5 Formed within the housing is internal chamber 5 , which will include the major components of a seat mechanism or means (in this embodiment adjustable seat 16 ), one-way valve 45 , an accumulator 10 , and a positioning mechanism or means 20 for allowing the position of accumulator 10 to be adjusted as described in more detail below.
  • the lower end of internal chamber 5 includes tapered sidewalls 9 to facilitate a sealing engagement with accumulator 10 .
  • internal chamber 5 includes a volume which may be referred to as the accumulator chamber.
  • FIG. 4 The illustrated embodiment of adjustable seat 16 is best seen in FIG. 4 .
  • This embodiment includes the circular base 60 with seal ring groove 64 and upright section 61 with elliptical opening 62 and cam pins 63 (e.g., upper cam pin 63 B and lower cam pin 63 A, the function of which is explained below).
  • FIG. 5 illustrates how spacer 17 slides within circular base 60 and quad ring seal 18 is position within groove 64 to form a seal with the internal sidewalls of internal housing chamber 5 .
  • FIG. 4 also shows how this embodiment of accumulator 10 includes a main body 14 , a smaller diameter upper section 41 , a seal groove 42 , and a lower open passage 44 (seen in FIG. 5 ). Viewing FIG.
  • FIG. 5 it is seen how this embodiment positions quad seal ring 11 and backup seal ring 12 in seal grove 42 .
  • FIG. 5 also shows how passage 44 communicates with an internal cavity 15 which is formed in accumulator body 14 and how smaller diameter upper section 41 slides into spacer 17 within circular base 60 of adjustable seat 16 .
  • the illustrated embodiments of accumulator 10 further include a one-way valve 45 positioned within the accumulator's internal cavity 15 .
  • the one-way valve is shown as being a poppet-type valve including poppet 46 , pressure differential spring 47 , spring retainer 48 , and o-ring 49 .
  • the poppet 46 includes a series of side apertures 50 and while hidden from view, an open top section such that fluid entering the poppet side apertures may exit through the open top section. It can further be seen that spring 47 biases the end of poppet 46 having o-ring 49 against lower part of accumulator internal cavity 15 .
  • While the illustrated embodiments show a one-way valve formed of a poppet assembly, many different conventional or future developed one-way valves may be utilized, as nonlimiting examples, various regulators (e.g., back-pressure regulators), solenoid valves, or shuttle valves.
  • FIG. 4 best illustrates the individual components of one embodiment of positioning mechanism 20 , which affects the position of adjustable seat 16 and ultimately accumulator 10 as explained in greater detail below.
  • the main components of positioning mechanism 20 include shaft 21 , cam members 22 A and 22 B, and knob 23 which acts as a control surface or gripping surface for applying torque to shaft 24 .
  • Other components of positioning mechanism 20 include spiral rings 29 , washers 28 , backup rings 27 , o-rings 26 , graduated scale ring 24 , fixing pins 25 , and securing screw 30 .
  • Shaft 24 will be positioned extending through elliptical opening 62 of adjustable seat 16 (better seen in FIGS. 5 and 6 ) and fixing pins 25 will fix cam members 22 against rotation on shaft 21 with the cam surfaces 33 ( FIG.
  • each cam member being oriented approximately opposite one another.
  • FIG. 5 it can be understood how rotation of cam members 22 causes the cam surfaces 33 to ride upon the cam pins 63 formed on adjustable seat 16 .
  • the illustrated cam surface 33 of cam member 22 A urges lower cam pin 63 A downward relative to DVCD housing 2 (i.e. , since shaft 21 is fixed vertically relative to housing 2 by extending through the sides of the housing) and thereby urges adjustable seat 16 downward within housing 2 .
  • cam member 22 B acting on upper cam pin 63 B will urge adjustable seat 16 upwards.
  • knob 23 rotates shaft 21 , cam members 22 , and thereby moves adjustable seat 16 while scale ring 24 provides a visual indication of the degree of cam member movement.
  • the graduation lines on scale ring 24 are calibrated to a linear distance adjustable seat 16 moves upon rotation of knob 23 .
  • the cam members 22 act to precisely control the upward and downward movement of adjustable seat 16 in the internal housing chamber.
  • DVCD 1 When employed in a positive displacement pump system, DVCD 1 may be connected to the pump head assembly by threads or other mechanical means located on the lower exterior of the housing 2 as suggested in FIG. 2 .
  • the adjustable seat 16 is shown in the closed or lower position and completely constrains the motion of the accumulator 10 such that it remains tightly positioned against tapered internal sidewalls 9 of housing 2 . In this position, it can be understood that when the pump head begins the discharge or pressurizing portion of it cycle, fluid becomes pressurized in the inlet 3 of the DVCD assembly.
  • fluid enters from the bottom through inlet 3 and encounters the bottom portion of accumulator 10 , which cannot move in response to the fluid pressure being exerted upon it because of adjustable seat 16 being in the fully lowered position.
  • the pressurized fluid acts against poppet 46 , which although biased closed by spring 47 , will open if fluid pressure is sufficient to overcome the force of spring 47 .
  • FIG. 6 illustrates poppet 46 moving to the open position under fluid pressure.
  • the actuation of poppet 46 allows fluid to pass through the resulting gap between the interior walls of accumulator internal cavity 15 and poppet o-ring 49 , then through the poppet side apertures or ports 50 and through the open top section of poppet 46 .
  • Once fluid moves through poppet 46 it freely passes through the interior of the adjustable seat 16 , positioning mechanism 20 , and exits the DVCD assembly through outlet 4 . It will be understood that once DVCD 1 is running in steady-state (e.g., the interior is filled with the fluid being pumped), then all fluid moved during the discharge cycle of the pump must flow into DVCD 1 and an equivalent mass of fluid (assuming a generally incompressible fluid) must exit outlet 4 .
  • FIG. 7 is illustrated with pressure removed from the interior of DVCD 1 for purposes of clarity. It can be seen that the cam members 22 (which are attached to one another and therefore move as a single unit), have been rotated about 145 degrees counterclockwise, which also actuates the adjustable seat 16 , causing it to move upwards and thereby creating a gap between the adjustable seat 16 and the accumulator 10 . Because no pressure is acting on accumulator 10 , it remains positioned against the bottom sidewalls 9 of internal chamber 5 . Likewise, poppet 46 remains seated against the bottom of accumulator internal cavity 15 , due to the force applied against it by spring 47 .
  • FIGS. 7 and 8 it can be understood that, overall, less fluid was discharged through DVCD 1 during the described cycle than when the accumulator 10 was constrained in the full downward position (i.e., as in FIG. 5 ) throughout the entire cycle.
  • the pump displaces a combination of fluid and solid, with the difference being the volume of fluid V 1 required to displace the accumulator 10 , which is displaced over the precise distance allowed by the adjustable seat 16 .
  • the pump head is therefore not allowed to replenish that volume of fluid during the suction cycle.
  • the pump's overall output was reduced by the volume displaced.
  • FIGS. 9 and 10 illustrate the cam members having been rotated a further 180 degrees counterclockwise, to their maximum rotational position. At this point, both cam members are prevented from moving further because a curved face notch 34 in the cam surfaces have engaged cam pins 63 . As previously described, this further rotation of cam members 22 further slidably actuates the adjustable seat 16 , causing it to move further upwards and thereby creating a larger gap between the adjustable seat 16 and the accumulator 10 . All movements and actions are as previously described in reference to FIGS. 7 and 8 , except that now the accumulator 10 is allowed to move a maximum distance and saves a larger volume V 2 from moving through outlet 4 .
  • cam members 22 can be rotated to any position, causing adjustable seat 16 to range from fully lowered to fully raised, and that accumulator 10 will therefore displace an adjustable amount of fluid as it travels in both directions in response to pressure or vacuum created by the cycles of the pump head assembly.
  • DVCD 1 the dimensions of DVCD 1 , including the diameter of the housing internal chamber 5 and accumulator 10 , and the amount of travel allowed by varying the diameter of the cam member 22 at their largest and smallest dimensions, and possibly other parameters, will determine the maximum amount of fluid that will be subtractable from the output of a pump to which DVCD 1 is connected. It is preferred that DVCD 1 have a fully seated or closed position, in which the pump head has maximum output and efficiency, and then a variable amount of fluid which can be subtracted from the pump output by adjusting the accumulator position within DVCD 1 .
  • adjustable seat 16 A includes an elongated stem 85 which has central passage 86 and threaded section 87 . Threaded section 87 will engage corresponding threads formed on the interior surface of housing chamber 5 as suggested in FIG. 12 .
  • rotation of adjustable seat 16 A counterclockwise or clockwise will result in it moving upward or downward within housing 2 A and thereby adjusting the space accumulator 10 has to move within housing chamber 5 .
  • One manner of applying torque to rotate adjustable seat 16 A is to form seat access windows 52 in housing 2 A ( FIG.
  • FIG. 12 also illustrates how o-ring seal 27 with backup seal 26 will prevent fluid from migrating around the top end of adjustable seat 16 A and escaping through access window 52 .
  • wiper seal 55 prevents fluid from migrating around the bottom end of adjustable seat 16 A and escaping through access window 52 .
  • the fluid path in FIG. 12 may be visualized when fluid pressure at inlet 3 overcomes poppet spring 47 . Fluid flows through poppet 46 as previously described, but then may flow directly into stem passage 86 and then exit outlet 4 .
  • the housing 2 A also differs from the earlier embodiment by having a smaller lower section threaded onto a larger upper section (see overlapping threads 56 ). As in the earlier embodiment, an o-ring 8 is positioned to effect a seal between the upper and lower sections of housing 2 A.
  • FIGS. 13 to 16 A still further embodiment of the DVCD device is seen in FIGS. 13 to 16 .
  • FIG. 13 illustrates how this embodiment has a volume control knob 223 positioned opposite inlet 203 while the outlet 204 is formed on the side of housing 2 B.
  • FIGS. 14 and 15 better illustrate how this embodiment of DVCD forms the adjustable seat with a stem or shaft 215 with inverted cup structure 225 on the lower end and the upper end being connected to control knob 223 .
  • Shaft 215 passes through retaining nut 222 and threadedly engages nut 222 , while nut 222 in turn threadedly engages the top section of housing 2 B.
  • a u-cup or unidirectional seal 219 is positioned between balanced shaft 215 and nut 222 ; an o-ring with backup seal 217 is positioned between shaft 215 and the internal sidewall of housing 2 B; and a further a u-cup or unidirectional seal 216 is positioned at the point where shaft 215 enters the open cavity of housing 2 B containing inverted cup 225 of the adjustable seat.
  • Shaft 215 is considered a “balanced shaft” in the sense that it has pressure bearing surfaces in multiple directions to neutralize pressure induced forces tending to bind its threaded surfaces.
  • FIG. 15 illustrates balance shoulder 220 on shaft 215 which is subject to the DVCD's internal fluid pressure via shaft central passage 221 and shaft side passages 224 .
  • FIG. 15 also illustrates the relief passage 227 which will bleed-off any fluid pressure escaping past seal 216 and which would otherwise tend to act adversely on the lower side of balance shoulder 220 .
  • the accumulator 210 is similar to that of other embodiments in that it includes a one-way valve formed of poppet 246 being biased against internal sidewalls of the accumulator by spring 247 . Similarly, accumulator 210 have a wiper seal 255 and o-ring 240 engaging the tapered internal sidewalls at the lower section of housing 2 B in order to form a seal when accumulator 210 is in its lower-most position.
  • FIG. 16 illustrates the situation where knob 223 has been rotated in order to raise the adjustable seat and its inverted cup 225 in order to allow accumulator 210 to move up from the bottom of the housing internal chamber upon the application of fluid pressure at inlet 203 .
  • fluid pressure increases sufficiently to overcome poppet spring 247 , fluid first flows around and through poppet 246 , through the apertures 226 in inverted cup 225 , and finally to exit fluid outlet 204 as suggested by the fluid flow arrows in FIG. 16 .
  • the embodiment of FIGS. 13 to 16 provides a configuration where the inlet and outlet are in closer physical proximity and the dosing volume control knob is more distant from the inlet and outlet portions of the DVCD device.
  • DVCD digital versatile disc
  • a solid component moves in response to pressure exerted by fluid within a positive displacement pump head during its discharge cycle, and is subsequently replaced prior to that pump's replenishment cycle, subtracting thereby a portion of fluid that would otherwise have been discharged.
  • This DVCD may have a solid component which is adjustable.
  • a further DVCD embodiment substitutes for and acts as the discharge check valve of a positive displacement pump, in which a solid component moves as described immediately above, in concert with normal check valve components (e.g., a ball or poppet). In this embodiment, the solid component is also adjustable.
  • DVCD 1 directly control dosing volume without disturbing the mechanical motion of the driver. Instead, DVCD 1 directly varies dosing volume at the point of delivery by controlling the “apparent size” of the dosing chamber. DVCD 1 causes a precisely controlled portion of fluid that would normally be discharged during the discharge portion of the pumping cycle to be “borrowed” immediately before it is delivered, then “paid back” or returned to the dosing chamber immediately prior to the replenishment or suction portion of the dosing cycle. DVCD 1 allows a controllable solid component to move “in place” of a variable portion of the fluid that would have otherwise been discharged.
  • This solid component moves a controlled distance in response to the hydraulic pressure from the discharge cycle, just prior to fluid discharge, and then resets itself in response to vacuum pressure just prior to the fluid replenishment or suction cycle, returning the displaced volume to the pump. It is entirely passive, merely reacting to the discharge and replenishment cycles, and it involves only one moving part in addition to what would exist in a non-controllable pump. Nevertheless, not all embodiments of DVCD 1 need have the above described functionalities and embodiments lacking such functionalities are also intended to come within the scope of the present invention.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Reciprocating Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
US13/827,136 2012-04-27 2013-03-14 Direct Volume-Controlling Device (DVCD) for Reciprocating Positive-Displacement Pumps Abandoned US20130287600A1 (en)

Priority Applications (17)

Application Number Priority Date Filing Date Title
US13/827,136 US20130287600A1 (en) 2012-04-27 2013-03-14 Direct Volume-Controlling Device (DVCD) for Reciprocating Positive-Displacement Pumps
NZ701890A NZ701890A (en) 2012-04-27 2013-04-26 Direct volume-controlling device (dvcd) for reciprocating positive-displacement pumps
AU2013251424A AU2013251424B2 (en) 2012-04-27 2013-04-26 Direct volume-controlling device (DVCD) for reciprocating positive-displacement pumps
BR112014026688A BR112014026688A2 (pt) 2012-04-27 2013-04-26 dispositivo de controle de volume, sistema de bomba alternativa com controle de volume regulável, sistema de bomba de diafragma, e método para regular o fluxo de fluido alimentado por uma bomba
IN9577DEN2014 IN2014DN09577A (fr) 2012-04-27 2013-04-26
JP2015509185A JP2015522736A (ja) 2012-04-27 2013-04-26 往復容量型ポンプ用の直接容積制御装置（ｄｖｃｄ）
MX2014012861A MX2014012861A (es) 2012-04-27 2013-04-26 Dispositivo de cotrol de volumen directo (dvcd) para bombas reciprocantes de desplazamiento positivo.
CN201380030737.1A CN104471244A (zh) 2012-04-27 2013-04-26 用于往复式正排量泵的直接体积控制装置(dvcd)
CA2871588A CA2871588A1 (fr) 2012-04-27 2013-04-26 Dispositif de commande de volume direct (dvcd) pour pompes a deplacement positif a mouvement alternatif
SG11201406870RA SG11201406870RA (en) 2012-04-27 2013-04-26 Direct volume-controlling device (dvcd) for reciprocating positive-displacement pumps
EA201491900A EA201491900A1 (ru) 2012-04-27 2013-04-26 Устройство непосредственного управления объемом (унуо) для возвратно-поступательных вытеснительных насосов
GEAP201313633A GEP20166468B (en) 2012-04-27 2013-04-26 Device directly controlling volume for pumps with reciprocal motion
PCT/US2013/038440 WO2013163560A1 (fr) 2012-04-27 2013-04-26 Dispositif de commande de volume direct (dvcd) pour pompes à déplacement positif à mouvement alternatif
EP13782465.2A EP2855932A4 (fr) 2012-04-27 2013-04-26 Dispositif de commande de volume direct (dvcd) pour pompes à déplacement positif à mouvement alternatif
IL235295A IL235295A0 (en) 2012-04-27 2014-10-23 Device for direct volume control to restore positive indentation of pumps
MA37559A MA37559B1 (fr) 2012-04-27 2014-11-21 Dispositif de commande de volume direct (dvcd) pour pompes à déplacement positif à mouvement alternatif
ZA2014/08650A ZA201408650B (en) 2012-04-27 2014-11-25 Direct volume-controlling device (dvcd) for reciprocating positive-displacement pumps

Applications Claiming Priority (2)

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US201261639524P 2012-04-27 2012-04-27
US13/827,136 US20130287600A1 (en) 2012-04-27 2013-03-14 Direct Volume-Controlling Device (DVCD) for Reciprocating Positive-Displacement Pumps

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US20130287600A1 true US20130287600A1 (en) 2013-10-31

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US13/827,136 Abandoned US20130287600A1 (en) 2012-04-27 2013-03-14 Direct Volume-Controlling Device (DVCD) for Reciprocating Positive-Displacement Pumps
US13/871,620 Abandoned US20130287608A1 (en) 2012-04-27 2013-04-26 Direct Volume-Controlling Device (DVCD) for Reciprocating Positive-Displacement Pumps

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US (2) US20130287600A1 (fr)
EP (1) EP2855932A4 (fr)
JP (1) JP2015522736A (fr)
CN (1) CN104471244A (fr)
AU (1) AU2013251424B2 (fr)
BR (1) BR112014026688A2 (fr)
CA (1) CA2871588A1 (fr)
EA (1) EA201491900A1 (fr)
GE (1) GEP20166468B (fr)
IL (1) IL235295A0 (fr)
IN (1) IN2014DN09577A (fr)
MA (1) MA37559B1 (fr)
MX (1) MX2014012861A (fr)
NZ (1) NZ701890A (fr)
SG (1) SG11201406870RA (fr)
WO (1) WO2013163560A1 (fr)
ZA (1) ZA201408650B (fr)

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US11209090B2 (en) 2018-03-02 2021-12-28 Marshall Excelsior Co. Bypass valve assembly with integrated flow control valve
WO2024081870A3 (fr) * 2022-10-13 2024-05-16 Checkpoint Group, Inc. Pompes à piston présentant des systèmes de détection de fuites et leurs procédés d'utilisation

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DE102017213736B3 (de) * 2017-08-08 2018-10-25 Conti Temic Microelectronic Gmbh Pneumatisches Ventil
US20220042507A1 (en) * 2018-07-17 2022-02-10 Autoquip, Inc. Dual bias regulator assembly for operating diaphragm pump systems
CN114450046B (zh) * 2019-08-26 2023-12-08 伊莱利利公司 旋转柱塞泵子系统
CN117662412B (zh) * 2024-01-30 2024-04-02 四川省宜宾普什驱动有限责任公司 一种耐高压高精密柱塞式液压泵及其工作方法

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US11209090B2 (en) 2018-03-02 2021-12-28 Marshall Excelsior Co. Bypass valve assembly with integrated flow control valve
US11692634B2 (en) 2018-03-02 2023-07-04 Marshall Excelsior Co. Bypass valve assembly with integrated flow control valve
WO2024081870A3 (fr) * 2022-10-13 2024-05-16 Checkpoint Group, Inc. Pompes à piston présentant des systèmes de détection de fuites et leurs procédés d'utilisation

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IL235295A0 (en) 2014-12-31
NZ701890A (en) 2017-01-27
IN2014DN09577A (fr) 2015-07-17
BR112014026688A2 (pt) 2017-07-18
AU2013251424B2 (en) 2017-09-07
EP2855932A1 (fr) 2015-04-08
US20130287608A1 (en) 2013-10-31
EP2855932A4 (fr) 2016-08-31
CN104471244A (zh) 2015-03-25
MX2014012861A (es) 2015-07-14
MA37559A1 (fr) 2016-03-31
JP2015522736A (ja) 2015-08-06
WO2013163560A1 (fr) 2013-10-31
MA37559B1 (fr) 2016-10-31
SG11201406870RA (en) 2014-11-27
GEP20166468B (en) 2016-04-25
CA2871588A1 (fr) 2013-10-31
AU2013251424A1 (en) 2014-11-27
EA201491900A1 (ru) 2015-04-30
ZA201408650B (en) 2016-04-28

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