US3335670A - Steady flow metering pump - Google Patents

Steady flow metering pump Download PDF

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Publication number
US3335670A
US3335670A US427640A US42764065A US3335670A US 3335670 A US3335670 A US 3335670A US 427640 A US427640 A US 427640A US 42764065 A US42764065 A US 42764065A US 3335670 A US3335670 A US 3335670A
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US
United States
Prior art keywords
fluid
passage
rate
drum
pumping
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.)
Expired - Lifetime
Application number
US427640A
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English (en)
Inventor
William A Williams
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.)
Milton Roy LLC
Original Assignee
Milton Roy LLC
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 Milton Roy LLC filed Critical Milton Roy LLC
Priority to US427640A priority Critical patent/US3335670A/en
Priority to GB3158/66A priority patent/GB1125741A/en
Priority to DE19661553127 priority patent/DE1553127A1/de
Application granted granted Critical
Publication of US3335670A publication Critical patent/US3335670A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • F04B43/0009—Special features
    • F04B43/0054—Special features particularities of the flexible members
    • 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
    • F04B43/0009—Special features
    • F04B43/0054—Special features particularities of the flexible members
    • F04B43/0072—Special features particularities of the flexible members of tubular flexible members
    • 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
    • F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
    • F04B43/14—Machines, pumps, or pumping installations having flexible working members having peristaltic action having plate-like flexible members

Definitions

  • metering pumps of the volume-displacement type in two forms. The first involves a plunger moving into a metering chamber and which by the displacement of liquid produces a known discharge of such liquid.
  • a liquid fills a flow channel either beneath a diaphragm which may be pressed downwardly into a flow channel to displace a volume of liquid ahead of a roller or the like, or it may comprise a deformable member such as a tube which is progressively pinched together by means of rollers likewise to displace a volume of liquid.
  • the output is characterized by its intermittent character. Though fairly uniform rates of flow have been obtained by utilizating two pumps with overlapping pumping cycles, nevertheless much has been left to be desired in obtaining a continuous flow, particularly with a single pumping device.
  • FIG. 1 is an exploded isometric view of the apparatus for effecting the present invention
  • FIG. 2 is a sectional view taken on a plane suggested by line A-A of FIG. 1;
  • FIG. 3 is a sectional view taken on a plane suggested by line B-B of FIG. 1;
  • FIG. 4 is a developed view of the pumping groove
  • FIG. 5 is a graph of the contour of the pumping groove at the outlet port
  • FIG. 6- is a graph representing the constant rate of change of the volume of the discharge reservoir during one pumping cycle.
  • FIG. 7 is a graph representing the constant rate of discharge of fluid from the discharge port through two pump cycles.
  • FIG. 1 the invention in one form has been shown in FIG. 1 as applied to a volumetric metering device 1 supported by a frame 2.
  • a motor 3 supported on the frame drives a gear reducer 4 from motor shaft 5.
  • the output of the gear reducer appears at its output shaft 6 which is secured in driving relationship to support shaft 8 by set screw 38.
  • Support shaft 8 is in its turn secured to the hub 7a of a driveplate 7 via set screw 39.
  • the pump assembly 9 is journaled via bearing 37 on support shaft 8.
  • support bracket 10 secured as by screws 10a to the frame 2 serves to support the stationary part of the pump assembly 9, mounting screws 11 being provided for that purpose.
  • the drive-plate 7 carries four rollers 12a12d, all four of which are shown in FIG.
  • Each roller is carried by a roller arm assembly 13, each having stub shafts 13a journaled in the peripheral portion of the driveplate 7. To each stub shaft 1311 there is secured one end of a spiral spring 15 with the opposite end engaging a stop pin 16 attached to the driveplate 7. The direction in which the spring 15 is wound is such as to bias the roller arm assembly 13 toward the support shaft 8. In the foregoing manner, all four rollers are biased downwardly against a diaphragm 14 disposed on the circumference of a drum 23.
  • a groove 36 (FIG. 2) on the circumference of drum 23 forms a pumping passage 17 between the drum 23 and diaphragm 14. It is to be noted that in FIG.
  • the diaphragm 14 may be of any suitable flexible material, it is preferred that it be made of stainless steel, or of an alloy of beryllium, such as beryllium copper. It is a feature of the present invention that the diaphragm 14 be made of a two-part material, the outer, a metallic flexible material and the inner to be a laminate 14a lining, or coating of a reagent-resistant material such as KelF or Teflon, these materials being well known to those skilled in the art under their trade names such as fluoride materials of the polytetrafluorochloroethylene type or the polytetrafluoroethylene type. In order to further provide resistance to reagents as well as chemically active fluids of all kinds, the drum 23 which the diaphragm 14 surrounds may also be coated with or made of the same material as the laminate lining 14a as best seen in FIG. 2.
  • FIGS. 2 and 3 The manner in which the diaphragm 14 is wrapped about the drum 23 is best shown in FIGS. 2 and 3.
  • the metallic and plastic coated diaphragm 14 is to be pressed inwardly of the drum 23 progressively 3 to close the pumping passage 17, there are provided flexible mounting means for the diaphragm 14. Though, it can flex to some degree, it is nevertheless important to keep the pumping diaphragm 14 both in circumferential and axial tension. Accordingly, an important feature of the present invention resides in the provision (FIG. 2) of two circular clamping rings 18, 18a, one of each being disposed adjacent the respective ends of the drum 23.
  • These semi-circular clamping rings 18, 18a are provided with serrated inner surfaces 24 and are tightly clamped downwardly against the diaphragm 14 to press it in fluidtight relationship with the outer surface of the drum 23, the clamping screws 25 shown in FIG. 1 being supplied for this purpose.
  • the serrations or teeth 24 provided in the clamping rings 18, 18a dig into the diaphragm 14 thereby rigidly securing the clamping rings 18 and 18a. in secure relationship to the metallic diaphragm 14.
  • Axial tension is developed by concave disc-like spring elements 19 known in the art as Belleville springs. These disc-like elements engage hub portions 26 and 26a of drum 23. Through the peripheral portions of spring elements 19, there extends a plurality of screws 20 which are uniformly tightened around the circumference of the spring elements 19. Thus, depending upon the torque applied to the plurality of screws 20, the Belleville springs 19 will exert outwardly directed tensile forces upon the clamping rings 18 and 18a which in turn act to maintain the diaphragm 14 in axial tension upon drum 23.
  • the diaphragm 14 is maintained in circumferential tension by a tightening and clamping assembly best shown in FIG. 3.
  • the ends of diaphragm 14 pass into an axially extending slot 29 and are secured between diaphragm clamping bars 30 and 31 which extend the full width of diaphragm 14.
  • the clamping bars 30 and 31 are secured to each other and to the ends of diaphragm 14 by means (not shown) such as screws which pass through an opening in clamping bar 30- and thread into clamping bar 31.
  • Upon selectively tightening screws 32 (only one shown), a selected circumferential tension is established on diaphragm 14. To assure operation under the circumferential tension, the clamping bar 31 never rests against the bottom of slot 29.
  • Bridge member 44 shown in FIG. 3 is positioned across the slot 29 in order that the rollers 12a-12d may pass thereover.
  • the bridge member 44 is secured in place at its ends adjacent the respective ends of drum 23 by the clamping rings 18 and 18a. That is, said ends of the bridge member are positioned underneath rings 18 and 18a so that when the clamping rings are tightened upon the circumference of drum 23, the bridge member 44 will accordingly be drawn into securing engagement with the drum 23.
  • the details of the discharge port 28 can best be seen by reference to FIGS. 2, 3 and 4. It includes a discharge reservoir 42 (best shown in FIG. 2) formed by a sawcut extending radially into drum 16.
  • the discharge passageway 43 extends from the discharge reservoir 42, and connects with the outlet passage 22 (-best shown in FIG. 1).
  • the depth of the pumping passage 17 can be seen in both FIGS. 3 and 4 to diminish from its maximum depth at the leading edge 47 of discharge reservoir 42, to zero depth at the trailing edge 48 of the discharge reservoir 42.
  • the rollers themselves may be provided with a core portion 33 of any suitable material and an outer peripheral portion 34 which is preferably made of a deformable material, such as a synthetic rubber.
  • the rollers are provided with a crowned surface 35 (best shown in FIG. 2), or in other words, curved or toroidal surfaces with the higher part midway of the ends of the roller.
  • roller 12a in FIG. 3 reaching the leading edge 47 of the discharge port 28,'the roller 12a will cease its pumping function since in the region of the discharge reservoir 42, there is a fluid connection to both sides of the roller 12a.
  • the next following roller, 12d in FIG. 3 takes over the pumping function and continues the delivery of fluid through the passages 22 and 43.
  • roller 12a although serving no pumping function after passing leading edge 47, nevertheless occupies a portion of the volume of discharge reservoir 42, particularly, a volume like that indicated at 49 underneath the diaphragm 14 as depressed by roller 12a.
  • the rollers must return to the top of the pumping passage 17 preparatory to their next pumping cycle. It will be appreciated that if the roller 12a were to be suddenly disengaged from the pumping passage, as is characteristic of metering devices employing the peristaltic principle as heretofore known, the volume of the discharge reservoir 42 would abruptly increase and hence cause a pulse in the output by a momentary decrease in flow.
  • the peristaltic pump of the present invention eliminates such a pulse in the output by effecting the disengagement of the rollers through a distance equal to that between two adjacent rollers and at a rate which maintains constant the rate of change of volume of the discharge reservoir during such disengagement of the rollers.
  • FIG. 5 shows the specific rate of disengagement or function for producing a constant rate of change of volume of discharge reservoir 42 in one exemplary embodiment disclosed wherein the maximum depth of the pumping groove was .008 and the angle between two adjacent rollers
  • FIG. 6 illustrates the constant rate of the expansion of the discharge reservoir 42 in terms of cubic units per degree of discharge port traversed by a given roller.
  • asecond roller in this case 12a, is just beginning its cycle of climb-out. This is because the angle subtended by two given rollers is equal to the angle subtended by the discharge reservoir 42.
  • Conditions may require that a pump have a uniform and constant intake suction as well as a uniform and constant discharge, or even a uniform and constant intake suction alone.
  • inventive concept utilized in the discharge port of the present invention can be employed in the intake port 27.
  • the rate of volumetric intake would be the differential of the rate of volume generated as the diaphragm 14 returns to its normal position upon a roller passing, and the rate at which the adjacent following roller decreases the volume of the intake reservoir 40.
  • the intake port 27 would of course, in the embodiment disclosed, subtend an angle equal to that between two adjacent rollers or 90.
  • the drum 23 was made two inches in diameter; the maximum depth and width of the pumping passage 17 were .008" and .625 respectively, the radius of the groove 36 was 12 inches, and the rollers 12a12d revolved around the axis of drum 23 at approximately twenty revolutions per minute. This resulted in an extremely accurate, uniform and non-pulsating flow at the discharge of the pump of 1 cc./
  • the dimensions of the above-disclosed pump may be altered as desired to increase or decrease the flow. Further, the motor speed can be changed to accordingly vary the flow rate as may be desired.
  • a peristaltic metering pump comprising:
  • a peristaltic metering pump comprising:
  • inlet means providing an inlet passage for said fluid to said means defining said flow passage
  • outlet means providing an outlet for said fluid from said means defining said flow passage
  • a peristaltic metering pump having a flexible fluid passage and a plurality of uniformly spaced pressure members which sequentially pass into closing engagement with said fluid passage at a first point and transfer therealong fluid to a second point at which said pressure members are disengaged from said fluid passage, the method of maintaining a uniform flow of fluid discharged from said fluid passage which comprises:
  • a peristaltic metering pump having a flexible fluid passage and a plurality of uniformly spaced pressure members which sequentially engage said fluid passage at an intake port and sequentially pass along said flexible fluid passage thereby transferring fluid to a discharge port where said plurality of pressure members are sequentially disengaged from said flexible conduit, the method of maintaining a uniform discharge of fluid at said port from one cycle to another which comprises:
  • a metering pump of the positive displacement type in which each of a plurality of lengths of a flow channel are filled with liquid forming discrete trapped volumes therealong, the method of producing and maintaining a uniform flow of fluid at an outlet passage of said metering pump comprising:
  • a metering pump comprising:
  • flexible conduit means defining a flow passage for fluid to be pumped
  • inlet means providing an inlet passage for fluid to said flexible conduit means
  • outlet means providing an outlet for fluid from said flexible conduit means
  • a peristaltic metering pump comprising:
  • the peristaltic metering pump of claim 8 further including a bridge member disposed across said axial slot providing said drum with smooth outer contour for smooth passage thereover by said means for progrssively applying the pumping force to the fluid passage.
  • a metering pump comprising:
  • inlet means providing an inlet passage for fluid to said fluid passage
  • outlet means providing an outlet passage for fluid from said fluid passage
  • said inlet means and said outlet means being located at opposite ends of said fluid passage
  • a peristaltic metering pump comprising:
  • a pumping groove formed into and around a portion of the circumference of said drum in a plane perpendicular to the axis of said drum and midway between the ends thereof,
  • inlet means providing an inlet passage for fluid to said fluid passage
  • outlet means providing an outlet passage for fluid from said fluid passage
  • clamping means positioned circumferentially of said diaphragm at either end of said drum and disposed in clamping engagement with said diaphragm
  • outlet means includes a discharge port having a leading and trailing edge and subtending an angle equal to the angle between two adjacent rollers
  • said pumping groove extending on the circumference of said drum through said subtended angle and the depth thereof diminishing from a maximum at the leading edge of said port to zero at the trailing edge of said port according to a prescribed function which will maintain constant the rate of increase of volume of said fluid passage as a given roller is disengaged from said fluid passage upon movement from the leading edge of said port to the trailing edge thereof, whereby a constant and nonpulsating delivery of fluid from said port will result upon revolution of said rollers around the axis of said drum.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
US427640A 1965-01-25 1965-01-25 Steady flow metering pump Expired - Lifetime US3335670A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US427640A US3335670A (en) 1965-01-25 1965-01-25 Steady flow metering pump
GB3158/66A GB1125741A (en) 1965-01-25 1966-01-24 Steady flow peristaltic metering pump
DE19661553127 DE1553127A1 (de) 1965-01-25 1966-01-25 Verfahren zum Foerdern eines konstanten Fluessigkeitsstroms und nach dem Verfahren arbeitende Zumesspumpe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US427640A US3335670A (en) 1965-01-25 1965-01-25 Steady flow metering pump

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US3335670A true US3335670A (en) 1967-08-15

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DE (1) DE1553127A1 (de)
GB (1) GB1125741A (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3397739A (en) * 1964-05-18 1968-08-20 Sibany Mfg Corp Heat exchange apparatus
US3591319A (en) * 1969-03-17 1971-07-06 Scientific Industries Flow conduit protective member for peristaltic pump
US4604034A (en) * 1983-05-03 1986-08-05 Peritronic Medical Industries Plc Peristaltic pumps
US20070258829A1 (en) * 2006-04-21 2007-11-08 Bredel Hose Pumps B.V. Peristaltic pump
WO2014198498A1 (de) * 2013-06-13 2014-12-18 Emitec Gesellschaft Für Emissionstechnologie Mbh Pumpe zur förderung einer flüssigkeit
US10309388B2 (en) * 2015-08-21 2019-06-04 Bio-Rad Laboratories, Inc. Continuous sample delivery peristaltic pump
US10648465B2 (en) 2016-11-07 2020-05-12 Bio-Rad Laboratories, Inc. Continuous sample delivery peristaltic pump
US11319945B2 (en) * 2018-12-26 2022-05-03 Baoding Lead Fluid Technology Co., Ltd Elastomeric-hose-compressing part, cartridge, and roller assembly for pump head of a peristaltic pump

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9415096U1 (de) * 1994-09-17 1995-02-02 Kammerer, Rolf, 75196 Remchingen Rotationsverdrängerpumpe

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US813443A (en) * 1905-05-10 1906-02-27 Graaff & Company Ges Mit Beschraenkter Haftung W Compressor.
GB484479A (en) * 1936-11-02 1938-05-02 Charles Bell Walker Improvements in pumps
FR57423E (fr) * 1946-07-24 1953-01-28 Nouveau procédé pour la transformation d'énergie pneumatique ou hydraulique en énergie mécanique et inversement
US2987005A (en) * 1958-06-30 1961-06-06 Standard Duplicating Machines Resilient passage milking-type pump
US3007419A (en) * 1957-04-19 1961-11-07 Bendix Corp Positive displacement pump

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US813443A (en) * 1905-05-10 1906-02-27 Graaff & Company Ges Mit Beschraenkter Haftung W Compressor.
GB484479A (en) * 1936-11-02 1938-05-02 Charles Bell Walker Improvements in pumps
FR57423E (fr) * 1946-07-24 1953-01-28 Nouveau procédé pour la transformation d'énergie pneumatique ou hydraulique en énergie mécanique et inversement
US3007419A (en) * 1957-04-19 1961-11-07 Bendix Corp Positive displacement pump
US2987005A (en) * 1958-06-30 1961-06-06 Standard Duplicating Machines Resilient passage milking-type pump

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3397739A (en) * 1964-05-18 1968-08-20 Sibany Mfg Corp Heat exchange apparatus
US3591319A (en) * 1969-03-17 1971-07-06 Scientific Industries Flow conduit protective member for peristaltic pump
US4604034A (en) * 1983-05-03 1986-08-05 Peritronic Medical Industries Plc Peristaltic pumps
US20070258829A1 (en) * 2006-04-21 2007-11-08 Bredel Hose Pumps B.V. Peristaltic pump
US8157547B2 (en) * 2006-04-21 2012-04-17 Bredel Hose Pumps B.V. Peristaltic pump with flow control
WO2014198498A1 (de) * 2013-06-13 2014-12-18 Emitec Gesellschaft Für Emissionstechnologie Mbh Pumpe zur förderung einer flüssigkeit
JP2016524074A (ja) * 2013-06-13 2016-08-12 コンチネンタル オートモーティヴ ゲゼルシャフト ミット ベシュレンクテル ハフツングＣｏｎｔｉｎｅｎｔａｌ Ａｕｔｏｍｏｔｉｖｅ ＧｍｂＨ 液体を圧送するポンプ
US10393102B2 (en) 2013-06-13 2019-08-27 Continental Automotive Gmbh Pump for pumping a liquid along at least one delivery path delimited by a deformable element braced in an axial direction by a stress anchor projecting through a pump rotation shaft
US10309388B2 (en) * 2015-08-21 2019-06-04 Bio-Rad Laboratories, Inc. Continuous sample delivery peristaltic pump
US10648465B2 (en) 2016-11-07 2020-05-12 Bio-Rad Laboratories, Inc. Continuous sample delivery peristaltic pump
US11319945B2 (en) * 2018-12-26 2022-05-03 Baoding Lead Fluid Technology Co., Ltd Elastomeric-hose-compressing part, cartridge, and roller assembly for pump head of a peristaltic pump
US11585338B2 (en) 2018-12-26 2023-02-21 Baoding Lead Fluid Technology Co., Ltd. Elastomeric-hose-compressing part, cartridge, and roller assembly for pump head of a peristaltic pump

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Publication number Publication date
GB1125741A (en) 1968-08-28
DE1553127A1 (de) 1971-02-04

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