WO2017027424A1 - Pompe de dosage sans impulsions améliorée et procédés s'y rapportant - Google Patents

Pompe de dosage sans impulsions améliorée et procédés s'y rapportant Download PDF

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Publication number
WO2017027424A1
WO2017027424A1 PCT/US2016/045921 US2016045921W WO2017027424A1 WO 2017027424 A1 WO2017027424 A1 WO 2017027424A1 US 2016045921 W US2016045921 W US 2016045921W WO 2017027424 A1 WO2017027424 A1 WO 2017027424A1
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WO
WIPO (PCT)
Prior art keywords
housing
fluid
deflection
pump
cylinder chamber
Prior art date
Application number
PCT/US2016/045921
Other languages
English (en)
Inventor
Jorgen Vindum
Original Assignee
Vindum Engineering, Inc.
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 Vindum Engineering, Inc. filed Critical Vindum Engineering, Inc.
Priority to CN201680047495.0A priority Critical patent/CN108350868A/zh
Priority to EP16835724.2A priority patent/EP3334931A4/fr
Priority to US15/745,140 priority patent/US20180209405A1/en
Publication of WO2017027424A1 publication Critical patent/WO2017027424A1/fr

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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
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • F04B11/005—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using two or more pumping pistons
    • 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
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/02—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having two cylinders
    • 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
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • 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
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
    • F04B39/121—Casings
    • 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
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • 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
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F04B53/162—Adaptations of cylinders
    • 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
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
    • 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
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/005—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders with two cylinders

Definitions

  • the present teachings generally relate to pump frame and pump designs. More particularly, the present teachings relate to systems and methods that relate to pump frames and pumps, such as metering pumps, that allow for continuous and pulse-free fluid flow. BACKGROUND OF THE INVENTIONS
  • the present arrangements and teachings offers pump frame designs and novel pump designs (e.g. , metering pumps) and methods relating thereto that provide substantially continuous fluid flow that is substantially pulse-free.
  • the present arrangements provide a pump that includes two or more housings inside a pump frame.
  • a deflection-prevention feature inside the pump serves to isolate one or more housings such that a deflection force received at one of the housings is not transferred to the other.
  • the absence of this transfer of deflection force allows an action of a piston inside the pump to draw in and dispense a certain fixed volume of fluid, preferably, at a predetermined pressure.
  • at least two of the housings, which house the at least two of the pistons do not deform during operation of the pump, and as a result, ensures that each of the pistons draw and dispense the same volume of fluid in a reproducible manner. This is particularly useful in metering pumps or in pumps that require continuous, pulse-free fluid flow.
  • the pump includes: (i) a pump frame including: (a) two or more housings disposed inside the pump frame; (b) one or more deflection-prevention features that, during an operative state of the pump, prevents transfer of a deflection force received at one of the housings to another of the housings; and (if) two or more motors, each disposed inside one of the housings and configured to drive a corresponding piston; (iii) two or more cylinders, each disposed adjacent to a
  • each of the cylinders having defined therein a cylinder chamber and wherein one end of one of the corresponding pistons is capable of protruding into a corresponding one of the cylinder chambers by a corresponding predefined extent;
  • two or more manifolds each includes or is communicatively coupled to a fluid inlet, and wherein each of the manifolds introduces an amount of fluid received from one of the fluid inlets into the corresponding one of the cylinder chambers; and (v) a fluid outlet for dispensing fluid in a substantially pulse-free manner.
  • the flow rate from the fluid outlet does not vary more than 0.1% from an average fluid flow rate.
  • the one or more deflection-prevention features may prevent deformation of one of the housings and/or another of the housings by preventing transfer of the deflection force received at one of the housings to another of the housings.
  • one or more of the deflection-prevention features allow each of the corresponding pistons to protrude into the corresponding cylinder chamber by a
  • one or more of the deflection-prevention features preferably allows the first piston to continue to protrude into the first cylinder chamber by a first predefined extent and allows the second piston to continue to protrude into the second cylinder chamber by a second predefined extent.
  • the values of the two predefined extents may be the same or different.
  • one or more of the deflection- prevention features is communicatively coupled to one of the chambers and is not
  • the deflection- prevention feature may at least partially surround one of the housings to prevent coupling of one of the housings with another of the housings or to effectively isolate, at or near a location of the deflection-prevention feature, one of the housings from another of the housings.
  • the deflection-prevention feature comprises a structural boundary having defined therein a cavity that is filled with air and/or material.
  • one or more of the deflection- prevention feature which may be incorporated into the above-mentioned pump, includes two or more compartments, each of which is isolated from the other.
  • one of the housings is disposed inside one of the compartments and another of the housings is disposed inside another of the compartments.
  • the deflection-prevention feature at least partially surrounds at least two of the housings to prevent coupling of and/or contact between these two housings.
  • two or more housings include: (i) a first housing having defined therein a first chamber; and (ii) a second housing having defined therein a second chamber.
  • at least one of the housings includes a floating member that is: (i) part of one of the housings; (ii) designed to receive the deflection force from one of the motors and/or pistons; and (iii) isolated from another of the housings.
  • the two or more motors include: (i) a first motor disposed inside the first housing and configured to drive a first piston; and (ii) a second motor disposed inside the second housing and configured to drive a second piston.
  • two or more of the cylinders include a first cylinder disposed adjacent to the first housing and having defined therein a first cylinder chamber and wherein one end of the first piston is capable of protruding into the first cylinder chamber by a first predefined extent.
  • two or more of the cylinders also include a second cylinder that is disposed adjacent to the second housing and having defined therein a second cylinder chamber and wherein one end of the second piston is capable of protruding into the second cylinder chamber by a second predefined extent.
  • the first cylinder chamber is designed to store a first predefined volume of the fluid and the second cylinder chamber is designed to store a second predefined volume of the fluid.
  • each of the first predefined volume and the second predefined volume is a value that ranges from about 1 ml and about 1000 ml.
  • the deflection-prevention feature may be configured to prevent change in amounts of the first predefined volume of fluid stored inside the first cylinder chamber and/or prevent change in amounts of second predefined volume of fluid inside the second cylinder chamber.
  • two or more of the manifolds include: (i) a first manifold that has or is communicatively coupled to a first fluid inlet and that introduces a first amount of fluid received from the first fluid inlet into the first cylinder chamber; and (ii) a second manifold that has or is communicatively coupled to a second fluid inlet, and that introduces a second amount of fluid received from the second fluid inlet into the second cylinder chamber.
  • the pump further includes two or more screws, each of which is coupled to a corresponding piston and a corresponding motor such that, during an operative state of the pump, each of the corresponding motors drives the corresponding screw and the corresponding piston.
  • at least two of the pistons operate in a complementary manner (i.e. , when one piston is in an active stroke, the other is in standby mode and vice versa), and thereby allowing the pump to continuously dispense the fluid from the fluid outlet.
  • dual-piston reciprocating pump or metering pump are capable of operating in complementary fashion.
  • the present arrangements provide a pump frame that includes: (i) a first housing having defined therein a first chamber; (ii) a second housing including a floating member and having defined therein a second chamber; and (iii) a deflection-prevention feature communicatively coupled to the first chamber, and not communicatively coupled to the second chamber.
  • the second housing is disposed adjacent to the first housing inside the same pump frame.
  • the deflection-prevention feature at least partially surrounds the floating member to prevent coupling, at or near a location of the deflection-prevention feature, of the second housing with the first housing.
  • the deflection-prevention feature may also at least partially surround the floating member to effectively isolate, at or near a location of the deflection-prevention feature, the second housing from the first housing.
  • the distance between the first housing and a boundary (closest to the first housing) defining the floating member is a value that exceeds about 0.5 mm.
  • the floating member of the pump frame may define a partial boundary of the second chamber. During pump operation, the floating member may receive a deflection-causing force.
  • the deflection-prevention feature surrounds at least one corner of the second housing that is proximate a corner of the first housing. In this embodiment, the deflection-prevention feature prevents the transfer of the deflection-causing force to the first housing (which has defined therein the first chamber).
  • the present arrangements provide another pump frame.
  • One such exemplar pump frame includes: (i) a first housing having defined therein a first chamber; (ii) a second housing having defined therein a second chamber; and (iii) a deflection-prevention feature that includes two or more compartments, each of which is isolated from the other by an isolating component.
  • the two housings are inside the same pump frame and the first housing is disposed inside or part of one of the compartments and the second housing is disposed inside or part of another of the compartments.
  • the deflection-prevention feature at least partially surrounds both - the first housing and the second housing - to prevent coupling of these two housings.
  • the above-mentioned isolating component includes a structural boundary having defined therein a cavity that is, in certain preferred embodiments, filled with air and/or material.
  • the present teaching also provide methods of dispensing a continuous fluid flow.
  • One such exemplar method includes: (i) filling a first cylinder chamber, having a first predefined volume, with the fluid received from a first fluid inlet; (ii) dispensing the first predefined amount of the fluid present inside the first cylinder chamber to a fluid outlet; (iii) filling a second cylinder chamber, having a second predefined volume, with the fluid received from a second fluid inlet, and wherein this filling is carried out contemporaneously with the dispensing described in (i); (iv) exerting, during the dispensing described in (ii), a deflection-causing force on a first housing that is disposed adjacent to the first cylinder chamber; and (v) preventing, using the deflection-prevention feature, transfer of the deflection-causing force from
  • the method further includes pressurizing the fluid inside the first cylinder chamber to a first predefined pressure value. Further, this pressurizing is preferably carried out prior to the dispensing (described in (ii)) from the first cylinder chamber.
  • the method further includes: (vi) dispensing the predefined amount of the fluid inside the second cylinder chamber to the fluid outlet; (vii) filling a first cylinder chamber having the predefined volume with the fluid received from the first fluid inlet, and wherein this filling is carried out contemporaneously with the dispensing (of the fluid inside the second cylinder chamber as described in (vi); (viii) exerting, during the dispensing (as described in (vi) from the second cylinder chamber, a deflection-causing force on the second housing; and (ix) preventing, using the deflection-prevention feature, transfer of the deflection- causing force from the second housing to the first housing.
  • the method further comprises pressurizing the fluid inside the second cylinder to a second predefined pressure value.
  • the first predefined pressure value and the second predefined pressure value is a high pressure that ranges from about 500 psi to about 50,000 psi.
  • the fluid flow to the fluid outlet has a flow rate that ranges from about 0.00001 ml/min to about 1000 ml/min.
  • Figure 1 shows a side-sectional view of a pump frame, according to one embodiment of the present teachings, which includes a deflection-prevention feature that isolates a housing inside the pump frame.
  • Figure 2 shows a side-sectional view of another pump frame, according to another embodiment of the present teachings, which includes another deflection-prevention feature that at least partially isolates more than one housing inside the pump frame.
  • Figure 3 shows a side-sectional view of a metering pump, according to one embodiment of the present arrangements, which includes the pump frame of Figure 1.
  • Figure 4 shows a side-sectional view of a metering pump, according to another embodiment of the present arrangements, which includes the pump frame of Figure 2.
  • Figure 5 shows a method, according to one embodiment of the present teachings, for continuously dispensing fluid in a pulse-free manner.
  • the present teachings relate to pump frames, pumps, such as metering pumps, and methods related thereto. These systems and methods provide fluid flow that is substantially free of pressure fluctuations or variations. Further, these systems and methods play an integral role in industrial applications where a uniform fluid pressure is critical (e.g., oil and gas rock core flooding or refinery flow simulations).
  • the present arrangements and teachings provide a commercially viable solution effectively provides pulse-free fluid flow that is enclosed, preferably, within a single pump frame.
  • FIG. 1 shows a pump frame 100, according to one embodiment of the present arrangements and that includes a first housing 102 disposed adjacent to a second housing 106 and both are positioned inside the same pump frame 100.
  • First housing 102 and second housing 106 have defined there a first chamber 104 and second chamber 108, respectively.
  • Second housing 106 further includes a floating member 110 that defines a partial boundary of second chamber 108.
  • Pump frame 100 also includes a deflection-prevention feature 112 to prevent a deflection force received at second housing 106 from being transferred to first housing 102.
  • deflection-prevention feature 112 effectively isolates, at or near a location of the deflection-prevention feature 112, one of the housings from the other.
  • deflection-prevention feature 112 includes a structural boundary having defined therein a cavity that is filled with air or a material.
  • Deflection-prevention feature 112 may be designed in any configuration that effectively isolates or decouples first housing 102 from second housing 106. During an operative state of the pump, deflection-prevention feature 112 prevents deflection-causing force acting on floating member 110 from being transferring to first housing 102. Similarly, any deflection force received at first housing 102 is not transferred to floating member 110 and/or second housing 106. As will be described in greater detail below, deflection-prevention feature 112 allows a pump (using pump frame 100) to provide continuous fluid flow that is substantially pulse-free.
  • deflection-prevention feature 112 at least partially surrounds floating member 110 of second housing 106. In one preferred embodiment of the present arrangements, deflection-prevention feature 112 surrounds at least one corner of second housing 106 that is proximate to a corner of first housing 102. In this configuration, deflection-prevention feature 112 surrounds at least a portion of two sides (e.g., floating member 110 and an adjacent side) of second housing 106. Thus, deflection-prevention feature 112 may provide deflection prevention on more than a single side of second housing 106.
  • deflection-prevention feature 112 surrounds three sides of second housing 106 (e.g., three sides of floating member 110 or, in the alternative, each side adjacent to floating member 110). In this embodiment, deflection-prevention feature 112 isolates three sides of second housing 106 from first housing 102 and, this in affect, allows a substantial portion of second housing 106 to float within pump frame 100. In this configuration, multiple sides of first housing 102, however, may not be isolated within pump frame 100.
  • the distance between a boundary defining floating member 110 and first housing 102 may be any distance that effectively isolates first housing 102 from second housing 106 and vice versa. In other words, the distance between floating member 110 and first housing 102 prevents any deflection-causing force acting on floating member 110 from being transferred to first housing 102. In one embodiment of the present arrangements, the distance has a value that exceeds about 0.5mm.
  • FIG. 2 shows a pump frame 200, according to another embodiment of the present arrangements and that includes a first housing 202 and a second housing 206 disposed adjacent to each other and integrated within the same pump frame 200.
  • First housing 102 includes a first floating member 214 and has defined therein a first chamber 206.
  • second housing 206 includes a second floating member 210 and has defined therein a second chamber 208.
  • Pump frame 200 also includes a deflection-prevention feature 202 having a first compartment 216 and a second compartment 218, which are isolated from each other by an isolating component 220.
  • First housing 202 may form a boundary of first compartment 216 and second housing 206 may, similarly, form a boundary of second compartment 286.
  • first compartment 216 at least partially surrounds first floating member 214 and second compartment 218 at least partially surrounds second floating member 210.
  • deflection-prevention feature 212 surrounds each first housing 202 and second housing 206 on three sides, respectively. In other words, deflection-prevention features 212 isolates three sides of first housing 202 from external portions of pump frame 200. Deflection-prevention feature 212, similarly, isolates three sides of second housing 206 from external portions of pump frame 200 and first housing 202.
  • deflection-prevention feature 212 prevents any deflection-causing force acting on first floating member 214 from being transferred to an external portion of pump frame 200 and/or second housing 206. Similarly, any deflection force on second floating member 210 is not transferred an external portion of pump frame 200 and/or first housing 202.
  • FIG. 3 shows a pump 350 according to one embodiment of the present
  • Pump frame 300 includes a first housing 302, a first chamber 304, a second housing 306, a second chamber 308, a floating member 310 and a deflection-prevention feature 312, which are substantially similar to their counterparts in Figure 1, i.e. , first housing 102, first chamber 104, second housing 106, second chamber 108, floating member 110 and deflection- prevention feature 112.
  • Coupled to pump frame 300 are a first cylinder 358 and a second cylinder 368, which have defined there a first cylinder chamber 360 and second cylinder chamber 370, respectively.
  • first cylinder chamber 360 is capable of receiving a first piston 356 and second cylinder chamber 370 is capable of receiving a second piston 366.
  • First manifold 372 and second manifold 374 each receive fluid from a first inlet 276 and second inlet 378, respectively and that fluid is ultimately delivered to an outlet 380.
  • a first motor 352, disposed and secured inside first housing 302, is configured to drive first piston 356.
  • a first screw 354 e.g., a ball screw or lead screw
  • First piston 356 is capable of protruding through a portion of pump frame 300 and occupies a space defined inside first cylinder chamber 360. During operation, first piston 356 may protrude into first cylinder chamber 360 by one or more predefined extents.
  • first motor 352 causes a portion of first housing 302 to deform in an outward direction, i.e. , away from first chamber 104.
  • second motor 362 causes floating member 310 to deform in an outward direction, i.e. , away from second chamber 108.
  • deflection-prevention features 312 prevents a deflection-causing force experienced at a portion of first housing 302 from being transferred to second housing 306. Moreover, deflection-prevention feature 312 prevents deformation of floating member 310 from being transferred to first housing 302.
  • Second piston 366 is capable of protruding through another portion of pump frame 300 and occupies a space defined inside second cylinder chamber 370. During operation, second piston 366 may protrude into second cylinder chamber 370 by one or more predefined extents.
  • first motor 352 and second motor 362 also includes a gearbox, which adjusts the rate of movement of a first screw 354 and/or second screw 364.
  • first motor 352 and second motor 362 also includes a gearbox, which adjusts the rate of movement of a first screw 354 and/or second screw 364.
  • present teachings are not limited to a motor to drive first piston 356 and second piston 366.
  • Other mechanisms may be used to drive first piston 356 and second piston 366 (e.g., pneumatic cylinder, actuator or belt drive coupled to an external motor).
  • first motor 352 raises or lowers first screw 354, which in turn raises and lowers first piston 356 within the space inside first cylinder chamber 360.
  • second motor 362 adjusts the height of second screw 364 such that second piston 366 raises and lowers within second cylinder chamber 370.
  • first piston 356 moves up and down within first chamber cylinder 360, however, the volume within first cylinder chamber 360 is decreased or increased.
  • the available volume inside second cylinder chamber 370 is increased or decreased by the movement of second piston 366.
  • first cylinder chamber 360 and a second cylinder chamber 370 have the same internal volume.
  • First manifold 372 may control fluid to and from first cylinder chamber 360.
  • first manifold 372 is a three-way valve coupled to first cylinder chamber 360, first inlet 376, and outlet 380.
  • first manifold 372 receives fluid from first inlet 376 (which may be part of first manifold 372) and transmits the fluid to first cylinder chamber 360.
  • first manifold 372 prevents fluid in first cylinder chamber 360 from entering and/or exiting while the fluid is pressurized.
  • first manifold 372 allows pressurized fluid to travel from first cylinder chamber 360 to outlet 380.
  • Second manifold 374 may be coupled to second cylinder chamber 370, second inlet 378 and outlet 380. Similar to first manifold 372, second manifold 374 may receive a fluid, convey the fluid to second cylinder chamber 370, prevent the fluid within second cylinder chamber 370 from entering and/or exiting while the fluid is pressurized. In another function, second manifold 374 conveys the fluid from second cylinder chamber 370 to outlet 380.
  • FIG. 4 shows a pump 450 according to another embodiment of the present arrangements that includes pump frame 400 that is substantially similar to pump frame 200 of Figure 2.
  • Pump 450 includes a first housing 402, a first chamber 404, a second housing 406, a second chamber 408, a second floating member 410, a deflection-prevention feature 412, a first floating member 414, a first compartment 416, a second compartment 418 and a isolating component 420, which are substantially similar to their counterparts in Figure 2, i.e., first housing 202, first chamber 204, second housing 206, second chamber 208, floating member 210 and deflection-prevention feature 212, first floating member 214, a first compartment 216, a second compartment 218 and a isolating component 220..
  • Pump 450 further includes substantially similar components as pump 350 of Figure 3.
  • pump 450 includes a first motor 452, a first screw 454, a first piston 456, a first cylinder 458, a first cylinder chamber 460, a second motor 462, a second screw 464, a second piston 466, a second cylinder 468, a second cylinder chamber 470, a first manifold 472, a second manifold 474, a first inlet 476, a second inlet 478, and an outlet 480 which is
  • first motor 352 substantially similar to their counterparts in Figure 3, i.e. , first motor 352, first screw 354, first piston 356, first cylinder 358, first cylinder chamber 360, second motor 362, second screw 364, second piston 366, second cylinder 368, second cylinder chamber 370, first manifold 372, second manifold 374, first inlet 376, second inlet 378, and outlet 380.
  • first motor 452 and second motor 462 are secured to first floating member 414 and second floating member 410, respectively.
  • first motor 452 causes first floating member 414 to deform.
  • second motor 462 causes second floating member 414 to deform.
  • Deflection- prevention feature 412 prevents the deflection force (which is capable of causing deformation) acting on second floating member 410 from being transferred to first housing 402.
  • deflection-prevention feature 412 prevents the deflection force acting on first floating member 414 from being transferred to second housing 406.
  • Figures 4 and 5 each show a pump 350 and 450 with two housings.
  • a pump may include multiple housings, each fitted with a corresponding ones of motor, piston, chamber cylinder and manifold.
  • the pistons may provide substantially continuous and substantially pulse-free fluid flow.
  • the current teachings also provide methods for dispensing a continuous fluid flow that do not use pumps 350 or 450 of Figures 3 and 4, respectively.
  • pumps such as those shown in Figures 3 and 4 are used.
  • the continuous fluid flow is also substantially pulse-free.
  • first piston 356 and second piston 366 work in concert (e.g. , in a complementary fashion as described below) to generate a continuous fluid stream, preferably, at a predetermined fluid pressure and fluid rate.
  • first piston 356 and second piston 366 alternate between two strokes: an active stroke and a standby stroke.
  • second piston 366 extends or delivers pre-pressurized fluid to outlet 380.
  • first piston 356 engages in a standby stroke, at which stage first piston 356 receives fluid and pre-pressurizes the fluid.
  • second piston 366 completes the active stroke (e.g., second piston 366 extends to its furthest point within second cylinder chamber 370), first piston 356 and second piston 366 switch functions.
  • second piston is now in a standby stroke and first piston is in an active stroke.
  • first piston 356 now delivers its pre-pressurized fluid to outlet 380, while second piston 366 retracts, receives fluid and pre-pressurizes.
  • First piston 456 and second piston 466 of pump 450 operate in substantially the same, but complementary manner, to generate a continuous, and preferably pulse-free, fluid flow.
  • Figure 5 provides a method 500 of dispensing a continuous fluid flow.
  • pump 350 of Figure 3 is used to describe the method of dispensing a continuous fluid flow, however, pump 450, of Figure 4, may be used in a substantially similar manner.
  • Method 500 begins with a step 502, which includes filling a first cylinder chamber 360, having a first predefined volume, with fluid received from first fluid inlet.
  • a first cylinder chamber 360, having a first predefined volume is filled with fluid received from first fluid inlet 376. This step is also referred to as the standby stroke inside the first cylinder chamber 360.
  • first manifold 372 is configured to receive and convey fluid from inlet 376 to first cylinder chamber 360. Simultaneously, first piston 356 retracts within first cylinder chamber 360. Motor 352 engages screw 354, which retracts first piston 356 to a predetermined lower position that, in certain instances, is used to define the fluid volume that will be transmitted during the active stroke of first piston 356. During the filling step of 502, first manifold 372 is configured so as to prevent any entry or exit of fluid from first cylinder chamber 360. [0056] First piston 356 may be extended or retracted within first cylinder chamber 360 to adjust the fluid volume that will be transmitted during the active stroke. First piston 356 may be retracted to increase the fluid volume within first cylinder chamber 360.
  • first piston 356 may be extended into first cylinder chamber 360 to reduce the fluid volume within first cylinder chamber 360.
  • a single pump 350 may be used to operate at different continuous fluid flow rates.
  • fluid flow to fluid outlet 380 has a flow rate that ranges from about 0.00001 ml/min to about 1000 ml/min.
  • the present arrangements provide for the fluid flow to be adjusted during operation of pump 350 by adjusting the fluid volume within the cylinder chambers.
  • step 502 involves pressurizing the fluid in first cylinder chamber 360 to a predetermined or predefined pressure value, PI. Reducing the volume within first cylinder chamber 360 pressurizes the fluid in first cylinder chamber 360. This can be accomplished by increasing the space occupied by first piston 356 inside second cylinder chamber 360, which decreases the volume available inside first cylinder chamber 360 and increases the fluid pressure. The fluid volume and pressure may be manipulated in a similar manner within second cylinder chamber 370 using second piston 366.
  • Pressurizing the fluid is performed by extending first piston 356, using first motor 352, from the predetermined lower position to a second position to reduce the volume in first chamber 110 and correspondingly increases the fluid pressure.
  • the second position corresponds to the predetermined fluid pressure, PI .
  • the second position is calculated by determining the amount of volume that is to be reduced to achieve the predetermined pressure of the fluid.
  • a second predetermined pressure value, P2, in second cylinder chamber 370 may be determined in the same manner.
  • the first predefined pressure value and the second predefined pressure value is a high pressure. In another embodiment of the present teachings, the first predefined pressure value and the second predefined pressure value ranges from about _500 psi to about 50,000 psi.
  • Step 504 includes dispensing the predefined amount of fluid present inside the first cylinder chamber to a fluid outlet.
  • the predefined amount of fluid present inside first cylinder chamber 360 is dispensed through first manifold 372 to fluid outlet 380.
  • This step is also referred to as the active stroke.
  • First motor 352 extends first piston 356 and pushes the preferably pre-pressurized fluid from first cylinder chamber 360 through first manifold 372 to outlet 380, while preventing any additional fluid from entering through first inlet 376.
  • a second chamber having a second predefined volume
  • the fluid is received through second manifold 374 from second fluid inlet 378.
  • the first predefined volume of first cylinder chamber 360 is substantially similar to the second predefined volume of second cylinder chamber 360.
  • the first predefined volume of first cylinder chamber 360 is different from the second predefined volume of second cylinder chamber 360.
  • each of the first predefined volume and the second predefined volume is a value that ranges from about 1 ml and about 1000 ml.
  • Another step 508 includes exerting, during the dispensing step 504, a deflection- causing force on a first housing that is disposed adjacent to the first cylinder chamber.
  • first housing 302 is shown adjacent to first cylinder chamber 360 and a deflection-causing force is received at first housing 302 when the fluid inside first cylinder chamber is dispensed.
  • an active stroke i.e., step 504
  • motor 352 applies a large downward force, Fl, to a portion of first housing 302 on which motor 352 is attached.
  • first housing 302 The force, Fl, applied to first housing 302 is equal and opposite to upward force of piston 356 and causes first housing 302 to flex in an outward direction or away from first chamber 304.
  • an equal and opposite force, F2 is applied to an opposing portion of pump frame 300 causing it to flex in an outward direction or away from first chamber 304.
  • opposite portion of pump frame 350 refers to the portion of pump frame 350 that is adjacent to first and/or second cylinders 358 and 368 of Figure 3.
  • a step 510 includes preventing, using a deflection-prevention feature, transfer of the deflection-causing force from the first housing to the second housing, which is disposed adjacent to the second cylinder chamber and is disposed adjacent to the first housing.
  • a deflection-prevention feature 312 prevents transfer of the deflection-causing force from first housing 302 to a second housing 306, which is disposed adjacent to second cylinder chamber 370 and first housing 302.
  • the force, Fl applied to the portion of first housing 302 causes first housing 302 to deflect in a downward direction.
  • deflection-prevention features 312 prevents a corresponding deflection of floating member 310 of second housing 306, because floating member 310 is isolated from the deflection-causing force acting upon first housing 302. Thus, second motor 362 and second piston 366 do not deflect.
  • An equal and opposite force, F2 is also applied to the opposing portion of pump frame 350 causing it to deflect upward and/or outward.
  • This upward and/or outward deflection of the opposing portions of pump frame 350 causes first cylinder 358, second cylinder 368, and second housing 306 to deflect upward and/or outward.
  • floating member 310 is isolated from first housing 302, and therefore, floating member 310 is free to deflect by the same distance and in the same direction as the opposing portion of pump 350.
  • second motor 362, second piston 366 and second cylinder chamber 370 deflects by the same distance and in the same direction as the opposing portion of pump frame 350. As a result, the volume of second cylinder chamber 370 remains the same and/or is unaffected.
  • second piston 366 performs the standby stroke according to the present teachings
  • the volume within second cylinder chamber cylinder 370 remains constant.
  • the fluid is pre-pressurized to second predetermined pressure, P2, and is not affected by the activity of or the forces exerted by first piston 356.
  • a pulse- free fluid flow is established through outlet 380.
  • the flow rate does not vary more than 0.1% from an average fluid flow rate.
  • a first housing is coupled to a second housing.
  • any deflection-causing force acting upon either first housing or second housing is transferred to the other housing which results in a fluid flow output with pressure and/or fluid rate pulsations.
  • the first piston pushes pressurized fluid from a first cylinder chamber to an outlet.
  • the first piston generates a deflection-causing force on a portion of the first housing on which a first motor is attached and a second force on an opposing portion of the first housing.
  • the second piston undergoes a standby stroke. Due to the coupled nature of first housing and second housing in the absence of a deflection-prevention feature, the deflecting force also deflects second motor and thus second piston within second cylinder chamber. The deflective force lowers the second motor, which simultaneously lowers the position of second piston within second cylinder chamber. In addition, the second force on an opposing portion of the first housing generated by first piston pushes the second cylinder chamber in an outward direction and away from the second piston. As a result, in the presence of deflection-causing forces, the fluid volume in a second cylinder chamber is greater than the second predefined fluid volume, which remained fixed in the presence of deflection-prevention feature.
  • the pressure relief causes the first and the second housings to return to a non-deflected state. Further, the second piston is forced further into the second cylinder chamber and the second cylinder returns to its original, lower position in this non-deflected state. As a result, the volume in second cylinder chamber is rapidly reduced. The reduced volume in the second cylinder chamber leads to either to a greater fluid flow rate at an output or the pressure in the second cylinder chamber spikes momentarily causing the flow to be pulsed. In the next stage, when the second piston is at the end of its active stroke, the fluid flow rate may spike or the pressure in the first cylinder chamber may momentarily spike.
  • Step 510 also applies when pump 450 of Figure 4, instead of pump 350 of Figure 3, is used.
  • deflection-prevention feature 412 prevents transfer of a deflection-causing force from the first housing 402 to a second housing 406.
  • first piston 456 applies a force to push the pressurized fluid out of first cylinder chamber 460.
  • first motor 452 applies a large downward force, Fl, against first floating member 414 on which motor 452 is attached.
  • the force, Fl, applied to first floating member 414 causes first floating member 414 to deflect in a downward direction.
  • Deflection-prevention feature prevents first floating member 414's deflection from contacting second floating member 410 or any other portion of pump frame 400.
  • first floating member 414 does not cause a deflection of second floating member 410 of second housing 406 because they are isolated from each other.
  • second motor 462 and second piston 466 do not deflect due to deflection-causing force acting at first floating member 414.
  • method 500 includes one or more additional steps. Once such step includes dispensing the predefined amount of fluid inside second cylinder chamber through second manifold to the fluid outlet.
  • the predefined amount of fluid inside second cylinder chamber 370 is dispensed through second manifold 374 to fluid outlet 380.
  • This step is substantially similar to step 504, except that fluid is dispensed from second cylinder chamber 370 rather than first cylinder chamber 360.
  • Another such step which is substantially similar to step 502, includes filling first cylinder chamber 360 with fluid received through first manifold from first fluid inlet. In Figure 3, by way of example, the first cylinder chamber 360 is filled with fluid received through first manifold 372 from first fluid inlet 376. This step is carried out contemporaneously with the above-mentioned dispensing step associated with second cylinder chamber 370.
  • a yet another such step includes exerting, during dispensing from the second cylinder chamber, a deflection-causing force on the second housing.
  • a deflection-causing force pushes floating member 310 of second housing 3012 in an outward direction.
  • Yet another step includes preventing, using deflection-prevention feature 312, transfer of the deflection-causing force from second housing 306 to first housing 302.
  • deflection-prevention feature 312 prevents transfer of the deflection-causing force from second housing 306 to first housing 302.
  • Deflection-prevention feature 312 provides a cavity into which floating member 310 may extend without contacting pump frame or first housing 302. The deflection-cause force of second housing 306 is not transferred to first housing 302.
  • pumps 350 and 450 allow pumps 350 and 450 to provide substantially continuous and substantially pulse-free fluid flow using a single pump frame.
  • the present arrangements allow for a compact pump designs that may be critical is certain industrial applications that require a compact, high-pressure pump with pulsation- free fluid flow.
  • pumps 350 and 450 may be used where laboratory settings that measure micro-flow rates, which are sensitive to any pulse caused by the pump.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Reciprocating Pumps (AREA)

Abstract

La présente invention concerne un procédé de distribution d'un écoulement de fluide continu, le procédé consistant : (i) à remplir une première chambre de cylindre, ayant un premier volume prédéfini, avec un fluide reçu à travers une première nourrice à partir d'une première entrée de fluide ; (ii) à distribuer la première quantité prédéfinie de fluide présent à l'intérieur de la première chambre de cylindre à travers la première nourrice vers une sortie de fluide ; (iii) à remplir une seconde chambre de cylindre, ayant un second volume prédéfini, avec un fluide reçu à travers une seconde nourrice à partir d'une seconde entrée de fluide, le remplissage étant effectué en même temps que la distribution ; (iv) à exercer, pendant la distribution, une force provoquant une déviation sur un premier boîtier qui est disposé de manière adjacente à la première chambre de cylindre ; et (v) à empêcher, en utilisant la caractéristique de prévention de déviation, un transfert de la force provoquant une déviation du premier boîtier vers un second boîtier, qui est disposé de manière adjacente à la seconde chambre de cylindre et est disposé de manière adjacente au premier boîtier.
PCT/US2016/045921 2015-08-13 2016-08-05 Pompe de dosage sans impulsions améliorée et procédés s'y rapportant WO2017027424A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201680047495.0A CN108350868A (zh) 2015-08-13 2016-08-05 改进的无脉动泵和与其有关的方法
EP16835724.2A EP3334931A4 (fr) 2015-08-13 2016-08-05 Pompe de dosage sans impulsions améliorée et procédés s'y rapportant
US15/745,140 US20180209405A1 (en) 2015-08-13 2016-08-05 Improved pulse-free metering pump and methods relating thereto

Applications Claiming Priority (2)

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US201562204958P 2015-08-13 2015-08-13
US62/204,958 2015-08-13

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CN112298393B (zh) * 2020-11-03 2021-11-26 无锡子可科技有限公司 安防巡逻用智能机器人

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US20050019187A1 (en) * 2003-07-23 2005-01-27 Whitworth Hendon Jerone Internal screw positive rod displacement metering pump
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US5304041A (en) * 1991-08-27 1994-04-19 Tetra Dev-Co Method and device for dosing pumping
JP2001207951A (ja) * 1999-11-16 2001-08-03 Reika Kogyo Kk 定量ポンプ装置
US20050019187A1 (en) * 2003-07-23 2005-01-27 Whitworth Hendon Jerone Internal screw positive rod displacement metering pump
JP2007327449A (ja) * 2006-06-09 2007-12-20 Nikkiso Co Ltd 無脈動ポンプ
KR101393511B1 (ko) * 2011-08-01 2014-05-13 주식회사 이화정량펌프 저맥동 고용량 다이어프램 펌프

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US20180209405A1 (en) 2018-07-26
CN108350868A (zh) 2018-07-31
EP3334931A4 (fr) 2019-01-02
EP3334931A1 (fr) 2018-06-20

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