EP0087823B1 - Membran für Membranpumpe oder Motor - Google Patents

Membran für Membranpumpe oder Motor Download PDF

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Publication number
EP0087823B1
EP0087823B1 EP19830102339 EP83102339A EP0087823B1 EP 0087823 B1 EP0087823 B1 EP 0087823B1 EP 19830102339 EP19830102339 EP 19830102339 EP 83102339 A EP83102339 A EP 83102339A EP 0087823 B1 EP0087823 B1 EP 0087823B1
Authority
EP
European Patent Office
Prior art keywords
diaphragm
pump
central zone
reinforcement
clamping portion
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
Application number
EP19830102339
Other languages
English (en)
French (fr)
Other versions
EP0087823A1 (de
Inventor
Leslie Sumner
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.)
Gallaher Ltd
Original Assignee
Gallaher 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 Gallaher Ltd filed Critical Gallaher Ltd
Priority to DE8080304192T priority Critical patent/DE3064327D1/de
Priority to EP19830102339 priority patent/EP0087823B1/de
Priority to AT83102339T priority patent/ATE9508T1/de
Publication of EP0087823A1 publication Critical patent/EP0087823A1/de
Application granted granted Critical
Publication of EP0087823B1 publication Critical patent/EP0087823B1/de
Expired 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
    • F04B43/12—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

  • the present invention relates to a diaphragm for material handling devices such as pumps or motors.
  • Rotary pumps have already been proposed, of the so-called peristaltic type, which use a flexible tube bent in an arc of a circle, the tube being squeezed by a plurality of rollers carried on a rotating member which makes contact with the tube at angularly spaced positions. This results in “slugs" of the fluid carried in the tube being carried forward from the inlet of the tube to its outlet.
  • Such pumps are particularly suitable for services which require the fluid being pumped to be kept isolated from the mechanism itself, but its disadvantage is that the tube, if not restrained, "walks" in the direction of the outlet. In consequence, the anchoring of the tube to prevent this is a problem which increases with the size of the tube and the viscosity of the fluid being pumped. It is a further disadvantage of this type of pump, that, when pumping "heavy" substances, such as concrete, the tube tends to collapse at the inlet end and it is necessary to evacuate the chamber in which the pump tube operates in order to overcome this tendency.
  • Diaphragm pumps have also been proposed, such as in German Patent 6243; British Patent Nos. 208,477; 562,409; French Patent No. 1,394,047 and United States Patent No. 2,794,400.
  • These pumps include a housing having an internal surface, and a flexible resilient diaphragm mounted within the housing and secured thereto to form with the internal surface a chamber.
  • First and second ports communicate with the chamber and a number of deflectors are each operable sequentially on the face of the diaphragm remote from the chamber, to urge the diaphragm towards the internal surface to form a closure or constriction which traverses the chamber.
  • closures or constrictions each move from the first to the second port, one of the closures being terminated after the succeeding closure has been initiated.
  • a disadvantage of such a construction is that there is a necessity for the diaphragm to be resilient, to enable it to take up the necessary shapes, and there is a tendency for the diaphragm to flex towards the low pressure side of the pump, thus causing the "slug" of material being pumped to be of small volume. For this reason, pumps of this nature are limited both in their size and by the low rotation speeds at which they can operate.
  • the flexible diaphragm prefferably be longitudinally reinforced so as to be substantially longitudinally inextensible and for the configuration of the device to be such that, as deflectors move sequentially along a path on said surface of the diaphragm remote from a chamber, the sum of the distances, measured along the diaphragm, between the clamping points at the longitudinal ends of the diaphragm and the deflector means adjacent thereto, and, where appropriate, between the adjacent deflector means in contact with the diaphragm, remains substantially constant.
  • the result of such a construction is that, because the length of the diaphragm remains substantially constant, whatever the position of deflector means, the diaphragm is prevented from collapsing into the reduced pressure zone or extending into the housing interior.
  • This enables the pump to be operated at relatively high speeds and pressures for lighter materials including slurries.
  • the pump is also capable of handling very heavy materials, such as mortars, and even concrete quite adequately.
  • the present invention relates to a flexible diaphragm for use in such a pump or motor device, having opposite ends and side edges, a longitudinally extending central zone and a clamping portion clampable between first and second housing parts of the pump or motor device, characterised in that said diaphragm is premoulded, in that said longitudinal central zone has therein a longitudinal reinforcement rendering said diaphragm substantially longitudinally inextensible, in that said clamping portion comprises a peripheral clamping portion extending around the full periphery of the diaphragm and in that two longitudinal corrugations are formed in the diaphragm, one on each side of said central zone, between said central zone and the peripheral clamping portion.
  • the diaphragm is premoulded so that its shape is such that it remains substantially undistorted when it is clamped in place and before the deflectors are placed in contact with the surface of the diaphragm remote from the internal surface of the housing.
  • This construction means that the diaphragm only has to flex a small amount.
  • the reinforcement may include, in addition to longitudinal fibres, other fibres which are arranged at an angle thereto in other parts of the diaphragm to give strength, but do allow the slight flexing necessary for the diaphragm to distort without stretching in the direction of movement of the deflectors.
  • the pump comprises a first housing part 12 and a second housing part 16 mounted thereon.
  • the housing part 12 includes a central dished portion having an upper internal surface or curved portion 12A blending into a first port 13 and a second port 14.
  • the curved portion 12A has associated therewith, on each side, a raised clamping surface which is formed by a curved surface 12B and a straight surface 12C and which faces generally upwardly, that is in the same direction as the surface 12A.
  • Curved surfaces 12B end with a straight surface at 12C at each end which extends over the ports 13 and 14.
  • clamping surfaces completely surround the periphery of the internal surface 12A and the ports 13 and 14.
  • the second housing part 16 is provided with surfaces 16B which cooperate with the curved surfaces 12B and straight surfaces 16C which cooperate with the end portion of the surfaces 12C so that the surfaces 16B and 16C together define a second peripheral clamping surface.
  • These clamping surfaces 12B, 12C and 16B, 16C are used to clamp the edge portions of a diaphragm 15 which is of the premoulded structure illustrated in Figure 3. As will be seen it has a corrugation at 1 5E on each side and a central portion 21 which is lower than the edge portions 21 A beyond the corrugations.
  • the diaphragm is moulded with a reinforcement therein, including fibres 15C ( Figure 3) which extend longitudinally, that is from left to right in Figure 1, in the central zone and includes other reinforcements 15D in other parts which are preferably at 45°, thus on the bias, to allow for some flexing, the longitudinal ones preventing extension in the longitudinal sense.
  • These reinforcements are preferably placed on or just below the upper surface 1 5B.
  • a rotary member 17 is rotatable about a central axis 17A and is mounted in bearings 25 in the second housing part 16.
  • Member 17 carries three rollers 18 which can bear on the upper surface 15B of the diaphragm. The rollers urge the diaphragm at spaced locations towards, and preferably against, the upper surface 12A. In this condition, the surface 12A and the diaphragm lower surface form a pumping chamber 10.
  • the particular manner in which the diaphragm is mounted enables it to be held very firmly and prevents any tendency of the diaphragm to "walk" as the rotary member 17 rotates in the direction indicated by the arrow.
  • the effective length of the upper surface of the diaphragm remains constant. That is, the sum of the distances, measured along the diaphragm, because the clamping surfaces 12C, 16C at one end of the diaphragm and the adjacent roller 18, arid from that roller to the next roller, when two rollers are in contact with the diaphragm, and from the next roller to the other clamping surfaces 12C, 16C, remains constant regardless of the position of the rotor and regardless of whether one or two rollers are in contact. This means that the diaphragm need not elongate at all during the action of the rollers and it is for this reason that it is possible to provide the reinforcement in the diaphragm.
  • the reinforcement in the longitudinal direction indeed prevents the diaphragm from elongating and the reinforcement arranged on the bias prevents too much distortion, but allow an adequate amount for the flexure of the diaphragm under the action of the rollers 18.
  • the constricted or closed off chamber 10 is moved from the first port 13 to the second port 14, and because there are at least three rollers 18, the capsule thus formed is always isolated from at least one of the ports. Because the sum of the distances mentioned above is constant, a positive pumping action can take place in an adequate manner. It will be appreciated that the closure caused by one roller is terminated after the succeeding closure is initiated.
  • the diaphragm clamping surfaces 12B, 16B are so arranged that they partially form arcs of a circle with substantially the same centre as the rotary member.
  • the rollers 18 are shown as being freely rotatable, but it is contemplated that they could be caused to rotate continuously thus to reduce the wear on the upper surface.
  • An additional wear sheet of flexible material may be secured above the diaphragm at the righthand side, as viewed in Figure 1, and extend over the full path covered by the rollers 18. This not only reduces wear, but can be used to adjust the thickness of the diaphragm to take up any manufacturing tolerances in the housing part 12.
  • the diaphragm is moulded so that it naturally has the shape illustrated in Figure 3, that is with the lower and upper surfaces of the edge portions 21 A having the same shape as the clamping surface 12B and 16B respectively.
  • the amount of moulded material in the moulded and reinforced diaphragm on the surface 15B (the length of which remains substantially constant at all positions of the roller) is such that it is only slightly in excess of that which allows the rollers to distort the diaphragm while avoiding rupture, but does not allow the diaphragm to deform further under negative pressure.
  • the reinforcement in the diaphragm is not elastic and is moulded to the diaphragm at or near the surface on which the rollers make contact. This not only reinforces the diaphragm to cater for negative and positive pressure developed during the pumping cycle, but also reduces wear on the diaphragm due to the action of the rollers.
  • the device can be used as a valve, by moving the member 17 to the position in which the rollers take up the position 18' and 18" as illustrated in phantom. This connects the port 20 to the port 14 and disconnects the port 13.
  • a similar symmetrical position could be assumed in which the port 13 is connected to the port 20 isolating the port 14.
  • the second housing part 16 is provided with a removable cover 26.
  • One of the rollers 18 is also removably mounted on the member 17. The reason for this is that, because of the shaping of the diaphragm and the configuration of the pump, it is important to clamp the diaphragm around its full periphery before any of the rollers contact the diaphragm so that the diaphragm can take up its natural position without any distortion or strain thereon during the clamping.
  • the second housing part 16 is removed and the used diaphragm taken away and the new diaphragm put into position.
  • the cover 26 is removed from the second housing part, and one of the rollers is then taken off.
  • the member 17 is rotated until the other two rollers are at the top, that is so that the zone of the removed roller is at the bottom.
  • the second housing part is then put in place and bolted down.
  • the dimensions of the rotary member 17 are such that the zone adjacent where the roller which had been removed is located does not touch the diaphragm, so that during the clamping operation no disturbance of the diaphragm can take place.
  • the rotary member is then rotated until the location of the removed roller is at the top and the roller put back in place whereafter the cover 26 can be fixed.
  • the configuration of the pump should be chosen to give the necessary constant path length. This can be determined fully theoretically, but in practice it has been found possible to design the pump empirically by taking a piece of flexible inextensible material, such as cord, fitting around a model of the rotary member 17 and its rollers, and determining the position of the clamps which provide a fully tensioned cord at all times.
  • the diaphragm must be flexible and substantially inextensible and is rendered so by reinforcement.
  • the reinforcement illustrated includes a central portion with fibres 15C extending longitudinally only. In practice, however, the reinforcement shown only at the sides at 1 5D will extend across the full width of the diaphragm and the central portion will have a reinforcement made of an open mesh fabric which includes the longitudinal fibres 15C and other fibres (not shown) at right angles thereto, making the diaphragm laterally inextensible.

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

Claims (6)

1. Flexible Membran für eine Membranpumpen- oder Motoreinrichtung mit einander gegenüberliegenden Enden und Seitenrändern, einem sich longitudinal erstreckenden zentralen Bereich und einem Klemmbereich, der zwischen ersten und zweiten Gehäuseteilen der Pumpe oder Motoreinrichtung klemmbar ist, dadurch gekennzeichnet, daß die Membran (15) vorgeformt ist, daß der longitudinale zentrale Bereich (21) eine longitudinale Verstärkung (15c) aufweist, wodurch die Membran im wesentlichen longitudinal nicht ausdehnbar wird, daß der Klemmbereich einen peripheren Klemmbereich (21 A) aufweist, der sich um die ganze Peripherie der Membran erstreckt, und daß zwei longitudinale Furchen (15E) in der Membran jeweils auf jeder Seite des zentralen Bereichs (21) zwischen dem zentralen Bereich (21) und dem peripheren Klemmbereich (21A) gebildet sind.
2. Membran nach Anspruch 1, dadurch gekennzeichnet, daß eine transversale Verstärkung (15D) vorgesehen ist; um die Membran im wesentlichen lateral nicht ausdehnbar zu machen.
3. Membran nach Anspruch 2, dadurch gekennzeichnet, daß die transversale Verstärkung (1 5D) sich transversal über die ganze Breite der Membran erstreckende Fasern aufweist.
4. Membran nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Membran in einer bogenförmigen Form vorgeformt ist, wobei der Krümmungsmittelpunkt des Bogens sich entlang einer zur Oberfläche der Membran parallelen und zur Länge der Membran perpendikularen Achse erstreckt, so daß die Membran teils zylindrische, konkave und konvexe Hauptflächen hat.
5. Membran nach Anspruch .4, dadurch gekennzeichnet, daß der zentrale Bereich (21) zwischen den Furchen (15E) einen größeren Krümmungsradius hat als jener der Klemmbereiche über die zwei Furchen (15E) hinaus.
6. Membran nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß die Verstärkung innerhalb der Dicke der Membran näher an deren konkaver Hauptfläche als an ihrer konvexen Hauptfläche angeordnet ist.
EP19830102339 1980-11-21 1980-11-21 Membran für Membranpumpe oder Motor Expired EP0087823B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE8080304192T DE3064327D1 (en) 1980-11-21 1980-11-21 Material handling device
EP19830102339 EP0087823B1 (de) 1980-11-21 1980-11-21 Membran für Membranpumpe oder Motor
AT83102339T ATE9508T1 (de) 1980-11-21 1980-11-21 Membran fuer membranpumpe oder motor.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19830102339 EP0087823B1 (de) 1980-11-21 1980-11-21 Membran für Membranpumpe oder Motor

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP80304192.0 Division 1980-11-21

Publications (2)

Publication Number Publication Date
EP0087823A1 EP0087823A1 (de) 1983-09-07
EP0087823B1 true EP0087823B1 (de) 1984-09-19

Family

ID=8190336

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830102339 Expired EP0087823B1 (de) 1980-11-21 1980-11-21 Membran für Membranpumpe oder Motor

Country Status (2)

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EP (1) EP0087823B1 (de)
DE (1) DE3064327D1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3745177B2 (ja) * 1999-11-18 2006-02-15 Ｙｋｋ株式会社 表面硬化した非晶質合金製成形品及びその製造方法
US10047863B1 (en) * 2017-05-24 2018-08-14 Larry Baxter Diaphragms with encapsulated springs
DE102017130465A1 (de) * 2017-12-14 2019-06-19 Tirron Elektronik Gmbh Fluidenergievorrichtung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB785597A (en) * 1955-08-16 1957-10-30 Reginald Clarence Ford Improvements in rotary pumps
US3176622A (en) * 1962-06-06 1965-04-06 Fred B Pfeiffer Pump
DE2106560C3 (de) * 1971-02-11 1975-04-24 Friedrich Dipl.-Ing. 4680 Wanne-Eickel Schwing Quetschpumpe zur Förderung von Beton
DE2106554C3 (de) * 1971-02-11 1975-03-20 Friedrich Dipl.-Ing. 4680 Wanne-Eickel Schwing Quetschpumpe zur Förderung von Beton
DE2257618C3 (de) * 1972-11-24 1975-09-04 Friedrich Dipl.-Ing. 4680 Wanne-Eickel Schwing Quetschpumpe zur Förderung von Beton
GB2088956B (en) * 1980-11-21 1984-05-16 Sumner Leslie Rotary positive-displacement fluidmachines valves

Also Published As

Publication number Publication date
EP0087823A1 (de) 1983-09-07
DE3064327D1 (en) 1983-08-25

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