US3312171A - Pumps - Google Patents

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Publication number
US3312171A
US3312171A US495105A US49510565A US3312171A US 3312171 A US3312171 A US 3312171A US 495105 A US495105 A US 495105A US 49510565 A US49510565 A US 49510565A US 3312171 A US3312171 A US 3312171A
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US
United States
Prior art keywords
diaphragm
piston
pair
lands
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
US495105A
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English (en)
Inventor
Francis H Cary
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.)
New York Air Brake LLC
Original Assignee
New York Air Brake 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 New York Air Brake LLC filed Critical New York Air Brake LLC
Priority to US495105A priority Critical patent/US3312171A/en
Priority to GB40780/66A priority patent/GB1093670A/en
Priority to DE1653577A priority patent/DE1653577C3/de
Priority to FR79434A priority patent/FR1496376A/fr
Application granted granted Critical
Publication of US3312171A publication Critical patent/US3312171A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F04B43/08—Machines, pumps, or pumping installations having flexible working members having tubular flexible members
    • F04B43/10—Pumps having fluid drive
    • F04B43/107—Pumps having fluid drive the fluid being actuated directly by a piston

Definitions

  • This invention relates to hydraulic pumps of the pulsator type wherein a secondary liquid is pumped by an elastic tubular diaphragm which is pulsed by a primary or operating liquid which is cyclically forced into and withdrawn from its interior.
  • the primary object of the invention is to simplify the construction of these pumps, and thereby reduce manu facturing costs, and to reduce the adverse effects resulting from the compressibility of the primary and secondary liquids.
  • the improved pump i characterize-d by an upright casing having three separa- :ble sections, the central one of which contains a through bore which defines the outer wall of the pumping chamber and which is closed by the other two sections, and by a molded, one-piece, elastic pumping element which provides not only the expansible pumping diaphragm but also a pair of seals for the joints between casing sections, a pair of cylindrical lands which fit the wall of the bore in the central section and perform a self-centering function for the diaphragm, and a transverse wall for the pumping chamber which is directed toward the outlet port and encourages the escape of gas from that chamber.
  • FIG. 1 is an axial sectional view of the improved pulsator rpump.
  • FIG. 2 is a sectional view taken on line 2-2 of FIG. 1.
  • FIG. 3 is an enlarged sectional view of a portion of the foraminous support for the diaphragm.
  • the pum comprises a vertical casing 11 including three separable sections 12-14 which are held together, and to the bottom wall of a support 15, by a plurality of bolts 16 which extend through openings formed in the end sections 12 and 14.
  • Central section 13 is formed with a through circular bore 17 which defines the outer wall of the pumping chamber 18 and which, at its upper end, is intersected by a combination inlet and discharge passage 19.
  • This passage 19 leads to a passage 21 extending through flange fitting 22, and thence, thnough the reverscly set check valves 23 and 24, to the inlet and discharge ports 25 and 26 formed in housings 27 and 28, respectively.
  • the check valves which are of the type described in my copending application Ser. No. 474,626, filed July 26, 1965, are clamped in place between the flange fitting and the housings 27 and 28 by bolts 29.
  • the inner wall of pumping chamber 18 is defined by a tubular diaphragm 31 which has a circular shape in cross section and is molded as an integral part of a pumping element 32.
  • This element 32 which is made of an elastomeric material such as Hypalon chlorosulforated polyethylene or Viton fluorocarbon rubber, both marketed by E. I. du Pont de Nemou-rs & Company, is formed with steps on its outer periphery which separate the diaphragm portion 31 from a pair of enlarged end lands 33 and 34.
  • the diameter of these lands is just slightly less than the diameter of bore 17, and, therefore, the lands form a snug fit with the bore and serve to center the diaphragm portion 31 within the pumping chamber 18.
  • the transverse end face 35 of land 33 lies in a plane which is inclined toward the passage 19 so that gases released from the pumped liquid are prevented from accumulating in the pumping chamber 18.
  • the pumping element 32 also is formed with a pair of O-rings 36 and 37, which are of circular cross section and which are joined to the ends of lands 33 and 34, respectively, by short, centrally located, annular webs 38 and 39. These O-rings and webs are received in recesses defined by the mating surfaces of the casing sections 12, 13 and 14, and are compressed during assembly to eflectively seal the casing joints.
  • the pumping element 32 and in particular, the diaphragm portion 31 thereof, is supported internally by a rigid, forarninous cylinder 41 whose upper end is seated in a counterbore in casing section 14 and whose lower end surrounds and is supported by the pintle 42 of section 12.
  • a rigid, forarninous cylinder 41 whose upper end is seated in a counterbore in casing section 14 and whose lower end surrounds and is supported by the pintle 42 of section 12.
  • the cylinder 41 can take many different forms, the one illustrated is a Metal Edge filter element, marketed by Purolator Products, Inc., and comprises a helically coiled flat metal wire 43 which, on one side, carries spaced, tapered projections 44 that separate adjacent turns in the finished coil.
  • the outside diameter of cylinder 41 is greater than the inside, diameter of pumping element 32 when the latter is in a state of repose, and therefore, it will be understood that the diaphragm 31 is, in effect, prestressed.
  • the diaphragm 31 is pulsed by a drive piston 45 which is guided in a central bore extending through casing sec tion 14 and projects into the interior of cylinder 41,
  • the piston 45 is formed with intersecting axial and radial passages 46 and 47, respectively, which lead to a liquidfilled reservoir 48 contained within support 15.
  • Piston 45 is reciprocated by a crank mechanism (not shown) located in the upper portion of the reservoir 48, and is encircled by a sleeve 49 whose upper end face 51 cooperates with radial passages 47 to define a spill-back valve for the pulsing pump.
  • the spill-back valve constitutes a device for varying the quantity of operating liquid which is forced into the diaphragm on each stroke of piston 45, and consequently serves to vary the quantity of secondary liquid which is displaced from pumping chamber 18 during each of such strokes.
  • the reservoir 48 is filled with operating liquid, inlet port 25 is connected with a source of the secondary liquid which is to be pumped, and discharge port 26 is connected to the system to which the secondary liquid is to be delivered.
  • spill-back sleeve 49 is an intermediate displacement position, and that piston 45 is in its top dead center position, the primary fluid displaced from within diaphragm 31 during the initial portion of the downward or discharge stroke of piston 45 escapes freely to the reservoir 48 through axial and radial passages 46 and 47. Therefore, during this portion of the discharge stroke, diaphragm 31 remains contracted.
  • the pump will discharge substantially equal quantities of secondary liquid during the succeeding pumping cycles.
  • the compressibility of the fluids trapped between the drive piston 45 and the inlet and discharge check valves 23 and 24 is of great importance. This is so because, as discharge pressure rises, a progressively larger portion of the piston stroke is wasted in compressing the fluids. As a result, the rate of discharge from port 26 decreases.
  • the illustrated pump incorporates certain features which reduce this effect. First, the use of the inclined face 35 on land 33 encourages the escape of gases from the circuit of the secondary liquid, and thereby tends to eliminate one highly compressible component of this fluid.
  • the clearance volume of the secondary liquid circuit i.e., he total volume of passages 19 and 21, and pumping chamber 18 when diaphragm 31 is fully expanded, can be made quite small because of the self-centering action of the lands 33 and 34.
  • the radial clearance between the expanded diaphragm and the wall of bore 17 would have to be increased in order to insure that the diaphragm would not contact, and thus rub, the wall during operation as a result of misalignment during assembly.
  • the clearance volume of the primary liquid circuit is kept to a minimum by using the pintle 42, and by using a close clearance between piston 45 and the central bore in casing section 14.
  • a one-piece pumping element made of an elastomer and comprising (a) an elongated tubular body of circular cylindrical shape having a pair of steps on its outer periphery that define a central diaphragm portion of one diameter and a pair of end lands of larger diameter, the
  • transverse face of one land being inclined with respect to the longitudinal axis of the body
  • a pumping element as defined in claim 1 in which the transverse face of .said one land lies in a plane.
  • a pulsator pump of the type embodying a tubular diaphragm the combination of (a) a three-part casing comprising an upright central section containing a through axial bore, and a pair of end sections having annular surfaces which are adjacent the end faces of said central section, the central section containing a port which intersects the axial bore near its upper end; and

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
US495105A 1965-10-12 1965-10-12 Pumps Expired - Lifetime US3312171A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US495105A US3312171A (en) 1965-10-12 1965-10-12 Pumps
GB40780/66A GB1093670A (en) 1965-10-12 1966-09-13 Pulsator diaphragm pump and pumping element therefor
DE1653577A DE1653577C3 (de) 1965-10-12 1966-09-30 Membranpumpe
FR79434A FR1496376A (fr) 1965-10-12 1966-10-11 Pompe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US495105A US3312171A (en) 1965-10-12 1965-10-12 Pumps

Publications (1)

Publication Number Publication Date
US3312171A true US3312171A (en) 1967-04-04

Family

ID=23967280

Family Applications (1)

Application Number Title Priority Date Filing Date
US495105A Expired - Lifetime US3312171A (en) 1965-10-12 1965-10-12 Pumps

Country Status (4)

Country Link
US (1) US3312171A (fr)
DE (1) DE1653577C3 (fr)
FR (1) FR1496376A (fr)
GB (1) GB1093670A (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4789016A (en) * 1985-10-25 1988-12-06 Promation Incorporated Container filling apparatus
US4883412A (en) * 1984-01-11 1989-11-28 Dosapro Milton Roy Variable capacity diaphragm pumps
US4960038A (en) * 1987-11-09 1990-10-02 Mitsubishi Denki Kabushiki Kaisha Diaphragm device
US5632444A (en) * 1995-04-13 1997-05-27 Caterpillar Inc. Fuel injection rate shaping apparatus for a unit injector
US6276907B1 (en) * 1999-08-12 2001-08-21 Wagner Spray Tech Corporation Hydraulically driven diaphragm pump
RU2285151C2 (ru) * 2004-11-22 2006-10-10 Николай Андреевич Томшин Гидроприводной диафрагменный насос

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3957399A (en) * 1975-03-20 1976-05-18 Graco Inc. Diaphragm pump
DE2930765C2 (de) * 1979-07-28 1983-01-05 BURDOSA Ing. Herwig Burgert, 6305 Buseck Gelochte Stützscheibe für die Membran einer hydraulisch betätigten Membranpumpe
GB2079862B (en) * 1980-05-31 1984-04-26 Tuchenhagen Otto Gmbh A diaphragm pump
FR2640698B1 (fr) * 1988-12-15 1994-06-24 Strasbourg Ecole Nale Sup Arts Pompe peristaltique

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2196993A (en) * 1936-10-17 1940-04-16 Joe H Kidder Expansion well pump
US2478568A (en) * 1946-03-08 1949-08-09 Harrison S Coe Pumping apparatus
US2786419A (en) * 1955-10-10 1957-03-26 Lynn John Pulsating hydraulic pump equipment

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2196993A (en) * 1936-10-17 1940-04-16 Joe H Kidder Expansion well pump
US2478568A (en) * 1946-03-08 1949-08-09 Harrison S Coe Pumping apparatus
US2786419A (en) * 1955-10-10 1957-03-26 Lynn John Pulsating hydraulic pump equipment

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4883412A (en) * 1984-01-11 1989-11-28 Dosapro Milton Roy Variable capacity diaphragm pumps
US4789016A (en) * 1985-10-25 1988-12-06 Promation Incorporated Container filling apparatus
US4960038A (en) * 1987-11-09 1990-10-02 Mitsubishi Denki Kabushiki Kaisha Diaphragm device
US5632444A (en) * 1995-04-13 1997-05-27 Caterpillar Inc. Fuel injection rate shaping apparatus for a unit injector
US6276907B1 (en) * 1999-08-12 2001-08-21 Wagner Spray Tech Corporation Hydraulically driven diaphragm pump
RU2285151C2 (ru) * 2004-11-22 2006-10-10 Николай Андреевич Томшин Гидроприводной диафрагменный насос

Also Published As

Publication number Publication date
GB1093670A (en) 1967-12-06
DE1653577C3 (de) 1974-11-14
DE1653577A1 (de) 1971-03-04
DE1653577B2 (de) 1974-04-04
FR1496376A (fr) 1967-09-29

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