EP3851674A1 - Pompe à double diaphragme - Google Patents

Pompe à double diaphragme Download PDF

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Publication number
EP3851674A1
EP3851674A1 EP21152179.4A EP21152179A EP3851674A1 EP 3851674 A1 EP3851674 A1 EP 3851674A1 EP 21152179 A EP21152179 A EP 21152179A EP 3851674 A1 EP3851674 A1 EP 3851674A1
Authority
EP
European Patent Office
Prior art keywords
diaphragm pump
membrane
drive
chamber
pump
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.)
Granted
Application number
EP21152179.4A
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German (de)
English (en)
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EP3851674B1 (fr
Inventor
Paul Knecht
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Tekoma Sarl
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Tekoma Sarl
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Publication date
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Publication of EP3851674A1 publication Critical patent/EP3851674A1/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
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
    • F04B43/025—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms two or more plate-like pumping members in parallel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
    • F04B43/025—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms two or more plate-like pumping members in parallel
    • F04B43/026—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms two or more plate-like pumping members in parallel each plate-like pumping flexible member working in its own pumping chamber
    • 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
    • F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
    • F04B9/045—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms the means being eccentrics

Definitions

  • the present invention relates to a double diaphragm pump with a mechanical drive mechanism.
  • Diaphragm pumps are used to convey fluids, especially liquids and gases.
  • a diaphragm pump has a diaphragm which is arranged in a diaphragm chamber and which separates a delivery space or fluid space or product chamber from a drive space, i.e. from a drive mechanism of the pump. Accordingly, the drive elements located in the drive space are not in contact with the at least partially aggressive fluid to be conveyed.
  • the diaphragm is set in motion by a hydraulic, pneumatic, mechanical or electromagnetic drive mechanism.
  • a mechanical diaphragm pump is generally more efficient, has a lower pulsation and can be used universally than, for example, a pneumatic diaphragm pump.
  • Mechanical diaphragm pumps can be driven by an electric motor via an eccentric and a reciprocating piston or connecting rod.
  • Double diaphragm pumps comprise a pump housing with two parallel line sections which form a first diaphragm chamber and a second diaphragm chamber.
  • a membrane is arranged which sealingly separates the respective fluid space from the drive space.
  • the drive mechanism of the double diaphragm pump is set up to move the diaphragms periodically.
  • the membranes can be coupled to a connecting shaft, also referred to as a coupling rod, and move in unison.
  • Independent drive means of the membranes which can be synchronized by means of a control, are also known.
  • the volumes of the conveying or fluid chamber and the drive chamber change complementarily to one another, so that the fluid chamber is filled with the medium to be conveyed in a suction movement and the fluid chamber is emptied in a pressure movement.
  • the conveying direction is specified by means of arranged valve devices, so that an outlet side is blocked during the suction movement and an inlet side is blocked during a pressure movement.
  • Double diaphragm pumps suck in fluid and push fluid out at the same time.
  • Diaphragm pumps with a multi-part pump housing are known, the individual housing parts of the pump housing being essentially plate-shaped, arranged along a longitudinal axis, sealed against one another and braced, for example, by means of fastening means.
  • the housing parts are made of metal, for example, so that sealing forces to be applied axially can be applied without distortion and without settling.
  • the suction connection and pressure connection can be arranged in a suitable orientation depending on the requirements.
  • Such diaphragm pumps are expensive to manufacture and can lose their strength or tightness over their lifetime under unfavorable operating conditions.
  • double diaphragm pumps with diaphragms moved back and forth in unison, i.e. synchronously with one another, in order to alternately fill and evacuate the pumping chamber have the disadvantage that there are periodically recurring pumping pressure drops on the outlet side. This leads to more or less severe interruptions in delivery and vibrations, which make downstream damping necessary. Furthermore, due to the material properties of the membranes, the delivery pressure shows a sawtooth-shaped curve over time.
  • Electromechanically operated double diaphragm pumps are known, a piston rod being in operative connection with a crank pin which is arranged on a free end of an output shaft of a geared motor. In this way, a rotary movement originating from the drive motor is converted into the linear movement of the piston rod or the diaphragms connected to it, as is the case for example in DE 20109650 U1 is described.
  • a diaphragm pump the diaphragm is subject to mechanical deformation during a pump cycle, so that over the life of the diaphragm pump, wear and tear and mechanical defects in the diaphragm often lead to the failure of the pump.
  • Known membranes are made of a material with a certain elasticity, e.g. elastomers such as NBR (acrylonitrile butadiene rubber).
  • elastomers such as NBR (acrylonitrile butadiene rubber).
  • Structural diaphragms are known so that the diaphragm is sufficiently dimensionally stable and sufficiently elastic to be deformed during pump operation by the opposing pressure forces acting on opposite diaphragm sides. These can, for example, have concentric webs or radial ribs on their side facing away from the fluid space, which allow a defined flexing movement of the structural membrane during the pumping operation. Molded and structured diaphragms can have a Teflon coating on their three-dimensional surface facing the medium.
  • the object of the present invention is to further develop a double diaphragm pump with a mechanical drive mechanism.
  • the double diaphragm pump according to the invention can be manufactured inexpensively and has a compact design.
  • the double diaphragm pump can be dismantled and parts subject to wear and tear are easy to replace, with no need for sealants on the product or medium side.
  • the double diaphragm pump according to the invention is also suitable for pumping aggressive chemicals and fluids with a solid content.
  • the double diaphragm pump is characterized by a high degree of efficiency and almost vibration-free operation, so that the good stability allows universal use.
  • the invention relates to a double diaphragm pump, other diaphragm pumps with a mechanical drive mechanism are also included in principle.
  • the double diaphragm pump according to the invention with a mechanical drive mechanism comprises a pump housing which has at least one suction connection and at least one pressure connection as well as a first diaphragm chamber and a second diaphragm chamber.
  • a first membrane in the first membrane chamber separates a first delivery space from a drive space and in the second membrane chamber a second membrane separates a second delivery space from an air chamber.
  • the second membrane chamber is designed as a mirror image of the first membrane chamber.
  • the delivery spaces are connected to at least one suction connection on the one hand and the pressure connection on the other hand via valve devices.
  • the first membrane and the second membrane can be connected to a coupling rod.
  • the mechanical drive mechanism of the double diaphragm pump comprises a drive piston and a ball joint that can be accommodated therein as well as a receptacle which can be connected to the ball joint and which is designed to be coupled to an output shaft of a drive unit designed as an eccentric shaft.
  • a diaphragm chamber is formed in the pump housing in two parallel line sections, in which free-swinging diaphragms are arranged so that a product or fluid chamber, referred to as the pumping chamber, and a drive chamber or an air chamber are sealingly separated from one another.
  • the drive space and air chamber of the two membrane chambers can be connected to one another by means of an air duct, preferably with a small diameter. Accordingly, when the diaphragms move in the other air chamber or the drive space, a counterpressure that builds up and decreases is generated. This counter pressure supports the movement of the diaphragms and serves to compensate for thermal effects and pump circulation effects.
  • the two membranes also referred to as the first membrane and the second membrane, can be connected to one another by a rigid coupling rod which extends axially along a longitudinal axis through the center of each of the membranes and is releasably attached to the membranes.
  • a fastening element is provided in a central zone on each of the membranes, for example vulcanized, which serves on the one hand for the detachable fastening of the coupling rod to the respective membrane and on the other hand for axially securing one of the membranes against or for releasable fastening with the drive piston of the mechanical drive mechanism.
  • each fastening element can have an internal thread, in which external thread, formed at ends the coupling rod, or vice versa. Furthermore, an internal thread can be provided on a membrane for connection to the mechanical drive mechanism on the fastening element, into which an external thread of the drive piston is screwed or vice versa.
  • Fastening by means of screwing has the advantage that the assembly is easy to handle, inexpensive and can be dismantled, and also enables adjustability in order to set a delivery volume.
  • the fastening element is preferably designed in the form of a disk, the diameter being selected such that it largely covers a central zone of the membrane.
  • the fastening element is made of metal, as a result of which a dimensionally stable and precise fastening is possible on the one hand for the coupling rod and on the other hand for the drive component of the drive mechanism.
  • the membranes are moved back and forth between two movement end points in push-pull.
  • the membranes are moved by separate drive means, with the movement of the membranes being able to be coordinated by means of an included control.
  • one of the conveying spaces is alternately filled with the medium or fluid to be conveyed in a suction movement and emptied in a pressure movement.
  • Valve devices at the suction connection and at the pressure connection specify the conveying direction by blocking the outlet side during the suction movement and the inlet side of the respective membrane chamber during the pressure movement.
  • a drive unit for example a motor
  • the drive unit can be detachably connected to the pump housing, for example by means of a correspondingly designed flange connection.
  • a free end of an output shaft of the drive unit protrudes into the pump housing and is provided there with an eccentric.
  • an output shaft designed as an eccentric shaft engages in the receptacle, the eccentric being able to be placed on a roller, ball or nail bearing and an outer ring of the bearing being able to be received in the receptacle.
  • the receptacle comprises a threaded hole on a side surface and thus perpendicular to the axis of the output shaft, into which a component of the drive mechanism designed as a ball joint can be screwed and is held in a clamping position.
  • the ball joint can be designed in such a way that it has a ball head and a threaded shaft extending therefrom, at the free end of which a threaded area is formed.
  • the ball joint is designed to transmit the movement emanating from the drive unit and the eccentric to one of the membranes.
  • the threaded bore provided in the receptacle is slotted, with a width of the slot being able to be changed by means of screwing means.
  • the screw means enable the threaded shaft to be positioned in the threaded bore and thus the ball joint relative to one of the membranes and, in a tensioned state, fix the adjustable or set position.
  • the ball joint is received in the drive piston, which can be connected to one of the diaphragms and is received displaceably within the pump housing.
  • a seal is in sealing contact with the drive piston and is received in a groove formed on the pump housing. Accordingly, no lubricants are required for the displaceable mounting of the drive piston, but an arrangement with dry lubrication is present.
  • the ball joint or the ball head is mounted in a bearing block that can be received in the drive piston, so that a rotary movement of the output shaft is transformed into a longitudinal movement of the drive piston and can be transmitted to one of the membranes.
  • the bearing block itself can be constructed in several parts and can be positioned within the drive piston.
  • the bearing block can bear against inserts, for example cylindrical spacers, received in the drive piston.
  • the end faces of the bearing block can be attached appropriately designed stops rest in the interior of the drive piston.
  • the drive piston has a through-hole so that the ball joint can be dismantled from the receptacle in the stored position by means of an insertable tool.
  • a tool holder can be formed on the ball head, in which a tool that can be introduced through the through hole engages and can be connected to the ball joint in a rotationally fixed manner. This through-hole enables the components of the mechanical drive mechanism to be dismantled.
  • the drive piston can be designed in several parts, with sleeve-shaped components being connectable to one another by a screw connection.
  • spring means can be received in the drive piston, between which the ball joint can be stored in a pretensioned manner.
  • the position of the ball joint is accordingly pre-tensioned so that it can always be reset to an initial position.
  • the reset takes place against a spring force of one of the spring means.
  • the spring means (s) can be designed in the form of spiral springs or disc springs, a free spring length being adaptable to the stroke of the drive piston. Since a limited rotational movement of the ball joint around its longitudinal axis but no movement in the direction of the longitudinal axis is possible, the ball joint provides a power transmission with a stable, centered mounting that avoids tilting or rolling.
  • the valve devices can be arranged in fluid-conducting connections of the delivery spaces on the one hand to the at least one suction connection and on the other hand to the at least one pressure connection.
  • a passive valve device can be arranged on at least one suction opening provided in each delivery chamber, which valve devices open when the associated membrane is sucked.
  • the insertable valve device is designed as a plate valve made of an elastic plastic. The movable valve plate can be connected to a plug, which can be received on a connecting channel at the respective suction opening. Depending on the position of the plate valve, a fluid-conducting connection between the delivery chamber and the suction connection can be released or closed.
  • the valve device that can be arranged there is designed as a flap valve made of an elastic plastic.
  • the flap valve can be inserted in a crossing area between the connecting channels and an outlet channel, so that the flap valve alternately opens or closes one of the pressure openings of the delivery spaces of the first membrane chamber and the second membrane chamber.
  • the flap valve is preferably designed in several parts.
  • the flap valve has a V-shape, a hinge shaft being held in a clamping manner at the base of the V-shape and being insertable into a hinge element. Accordingly, the flaps or wings of the flap valve can perform a tilting movement.
  • the flap valve can be assembled and disassembled through the pressure connection.
  • at least the hinge element is firmly fixed in position and the hinge shaft, held in a clamping manner in the V-shape of the wing, can be pressed into receptacles on the hinge element.
  • the pump housing is constructed in several parts, with a pump cover, a control block, in which the suction connection for sucking in a fluid to be pumped and the Pressure connection are provided for the discharge of the pumped fluid and comprises a drive housing and can be connected to one another in a sealing manner.
  • the pump cover and control block therefore form a type of pump head which can be connected to the drive housing.
  • the control block itself can be made in one piece or in several pieces.
  • the pump housing is made of a plastic which is in particular chemically inert and resistant to the medium to be conveyed. Alternatively, however, a design made of metal is also conceivable.
  • One of the diaphragm chambers can be formed by the pump cover and the control block and the other of the diaphragm chambers, the first diaphragm chamber, is formed between the control block and the drive housing.
  • the control block On the parallel outer surface of the control block, circular depressions can be formed, each of which is arched over by one of the membranes.
  • a circumferential groove is provided concentrically around the circular recess on each of the two outer sides of the control block, in which a peripheral annular bead of the respective membrane can be received.
  • the separating surfaces between the pump cover and the control block and between the control block and the drive housing are sealed against one another via the membrane that can be arranged in this separating surface.
  • the several parts of the pump housing can be connected to one another by means of screw connections which are provided in an arrangement which enables a uniform application of force.
  • control block can be constructed in several parts.
  • the individual blocks can be connected to one another in a force-fitting and / or form-fitting sealing manner by pressing or another suitable connection technology.
  • the control block comprises a suction block with the suction connection and inlet channel and connection channels, a pressure block with the pressure connection and outlet channel and connection channels and a central block, designed to accommodate the coupling rod.
  • the at least one suction connection is accordingly in fluid-conducting connection via an inlet channel and a respective connection channel with a suction opening of the respective delivery space of the first membrane chamber and the second membrane chamber.
  • the fluid is conveyed from the conveying chamber via a pressure area via so-called pressure openings from the conveying chambers via respective connecting channels to an outlet channel and to the pressure connection.
  • the direction of conveyance is determined by the position of the valve devices.
  • the connecting channels can be T-shaped in the suction area and Y-shaped in the pressure area, for example.
  • each membrane is designed as a structural membrane.
  • a membrane core can be provided, which causes a certain stiffening of the central zone.
  • the fastening element for connection to the drive mechanism and the coupling rod can also be used in this.
  • the membrane can comprise one or more zones, each of which fulfills different functions.
  • the membrane comprises the aforementioned annular bead and thus a clamping zone, by means of which the membrane is clamped between housing parts of the pump housing and is held in a sealing manner on the circumferential side. Centering and / or positioning in relation to the drive mechanism is possible by means of the clamping zone. Due to the sealing effect, the housing parts of the pump housing are sealed against the environment and against the drive mechanism in the area of the medium to be conveyed without additional sealing means.
  • One or more radial zones of the membrane can connect between the clamping zone and the central zone, which zones are convex and / or concave in the unloaded state of the membrane and, for example, fulfill a support function and / or a compensation function. This enables the diaphragm to be guided as safely and with as little vibration as possible. This also favors quiet operation.
  • the membranes on the side of the fluid or conveying chamber are made of a material which is largely insensitive to aggressive chemicals in particular.
  • the membrane can be made of a chemical-resistant, but at the same time very tear-resistant and elastic material, such as plastic.
  • Each of the membranes preferably comprises at least two individual membrane layers lying on top of one another and connected to one another.
  • these are plastic layers made of different materials, for example a PTFE (polytetrafluoroethylene) or a chemically modified PTFE with a certain glass fiber content, which show only a low tendency to deform under load and a low gas permeability.
  • plastics with high resistance, including against mineral oils and chemicals, as well as good technological properties such as swelling resistance, elasticity, and compression set resistance are suitable.
  • the double diaphragm pump according to the invention can easily be dismantled into its individual parts.
  • wearing parts, for example valve devices can easily be exchanged if necessary without completely dismantling the double diaphragm pump.
  • membranes and valve devices can be exchanged separately from one another.
  • FIG. 1 shows a perspective view of a pump housing 10 of a double diaphragm pump 1.
  • the pump housing 10 is constructed in several parts in the embodiment shown. It accordingly comprises a pump cover 12, a control block 14 and a drive housing 16.
  • the drive housing 16 can be connected to a drive unit (not shown), for example an electric servomotor, or a conventional drive motor or air motor.
  • An output shaft 20 of the drive unit designed as an eccentric shaft can be supported in the drive housing 16 and is in operative connection with a mechanical drive mechanism to be described below. The rotary movement of the output shaft 20 of the drive unit is thus transformed into a translational movement of the mechanical drive mechanism, ie into a sinusoidal movement.
  • the pump housing 10 or parts thereof can be made from a plastic, for example from polytetrafluoroethylene or another chemically inert material.
  • Figure 2 shows a longitudinal section through the double diaphragm pump 1.
  • the diaphragm pump shown as a double diaphragm pump 1 is not limited to an embodiment as a double diaphragm pump, but rather its technical principles can be applied to every conceivable embodiment of a diaphragm pump.
  • the drive unit (not shown) can be detachably fastened to the pump housing 10 or the drive housing 16 by means of a flange connection.
  • the output shaft 20 of the drive unit designed as an eccentric shaft, protrudes into the interior of the drive housing 16 and is supported there. Furthermore, the eccentric formed on the output shaft 20 is in contact with a receptacle 100 or is received in a bearing arranged in the receptacle 100.
  • the output shaft 20 can be coupled to the mechanical drive mechanism to be described in more detail, here on the Figures 3 , 9 and 10 is referred.
  • the mechanical drive mechanism comprises drive components which are designed as a connecting rod or a push rod or drive rod and can be brought into operative connection with the output shaft 20.
  • a drive piston 120 is provided which can be connected to a membrane in order to move it.
  • the illustrated double diaphragm pump 1 has a first diaphragm chamber 40 in the multi-part pump housing 10 between the drive housing 16 and the control block 14 and a second diaphragm chamber 50 between the control block 14 and the pump cover 12.
  • a membrane 42, 52 is arranged in a freely oscillating manner.
  • the membranes 42, 52 each have a peripheral annular bead 44, 54, which is pressed together between the drive housing 16 and the control block 14 or between the latter and the pump cover 12 in a correspondingly designed clamping area and held there in a sealing manner.
  • the membrane 42 separates a first delivery space 46 from a drive space 48 in the first membrane chamber 40 and the membrane 52 in the second membrane chamber 50 separates a second delivery space 56 from an air chamber 58 with changing volumes.
  • the drive space 48 and the air chamber 58 are shown connected to one another via an air duct 18, which is preferably designed with a small diameter.
  • the air channel 18 is set up so that, when the membrane 42 in the first membrane chamber 40, for example, performs a suction movement, air is pressed from the drive space 48 into the air chamber 58 of the second membrane chamber 50.
  • a pressure builds up in the diaphragm chamber 50, which supports the pressure movement of the second diaphragm 52 and vice versa.
  • the materials of the membranes 42, 52 are preferably elastomeric composites, for example NBR (acrylonitrile butadiene rubber), which takes on the function of an elastic base material in the composite.
  • NBR acrylonitrile butadiene rubber
  • a chemically inert PTFE film polytetrafluoroethylene
  • each of the membranes 42; 52 is a fastener 60 in a central zone of the membranes 42; 52 recordable, e.g. embedded.
  • the fastening element 60 may be formed with a shoulder that passes through one in the central zone of the membranes 42; 52 provided opening is performed. Furthermore, a disk-shaped area can be formed on the fastening element 60, which this opening or the central zone of the membranes 42; 52 covered and rests against this.
  • the attachment of the fastening element 60 is designed as a component of a screw connection, ie has, for example, an internal thread 62 into which an external thread of either a cover element 64 or an external thread of a drive piston 120 comprised by the drive mechanism can be screwed. The latter is used to releasably connect one of the membranes 42; 52 with the drive mechanism.
  • a second internal thread 66 is formed, into which an external thread of a coupling rod 68 for rigidly connecting the first membrane 42 and the second membrane 52 can be screwed.
  • the arrangements of the threads can also be reversed.
  • the parts can be detached and dismantled from one another in a simple manner, so that an exchange of one of the membranes 42; 52 is easy to do.
  • Other ways of connecting the membranes 42; 52 with the coupling rod 68 or the cover element 64 and / or drive piston 120 are conceivable.
  • the coupling rod 68 with the membranes 42; 52 can be connected by means of a form fit, for example the coupling rod 68 can be connected to at least one of the membranes 42; 52 overmolded.
  • the membranes 42; 52 in the form of a structural membrane, with several zones having different functions being able to be formed between the central zone and the annular bead 44.
  • the membranes 42; 52 in the form of a structural membrane, with several zones having different functions being able to be formed between the central zone and the annular bead 44.
  • zones having different functions being able to be formed between the central zone and the annular bead 44.
  • For this purpose are in the direction of conveying space 46; 56 concavely and / or convexly arched zones are conceivable, which can be designed as a support zone and / or as a compensation zone.
  • the membranes 42; 52 can have a membrane core 41 which, as a mold core, stabilizes the central zone in particular.
  • the membrane core 41 can be made of metal, plastic or an elastomer in the membranes 42; 52 be vulcanized or glued in to prevent sagging the membrane 42; 52 above the suction or pressure openings to be described in the conveying spaces 46; 56 is reduced or canceled.
  • the Figure 3 shows a cross section of part of the double diaphragm pump 1 according to the embodiment of FIG Figure 2 in a top view.
  • the same elements are denoted by the same reference symbols.
  • a valve device designed as a plate valve 90 which determines the conveying direction of the fluid or medium to be conveyed, is accommodated at each suction opening 70.
  • the fluid to be conveyed is fed via a suction connection 72 at the inlet, an inlet channel 74 and one of the connecting channels 76 to one of the suction openings 70 in the delivery chamber 46; 56 of the membrane chambers 40; 50 promoted, in which the arranged membrane 42; 52 is in the suction position.
  • the plate valve 90 Details of the plate valve 90 are shown in Figure 7 shown.
  • the pumped fluid is when the membrane 42; 52, in which the corresponding plate valve 90, the suction opening 70 in the delivery chamber 46; 56 closes, conveyed via the pressure opening 80, the connection channel 76, an open flap valve 92 and an outlet channel 84 to a pressure connection 82.
  • the flap valve 92 is arranged and designed at an intersection area between the connecting channels 76 and the outlet channel 84 that with the pressure movement of the membranes 42; 52 the fluid from one of the conveying spaces 46; 56 is squeezed out. Details of the flap valve 92 are shown in FIG Figure 8 shown. In particular, the flap valve 92 can be inserted or removed from the pump housing 10 via the outlet channel 84.
  • the Figures 4 and 5 each show different phases of the assembly of a double diaphragm pump 1 according to an embodiment.
  • the control block 14 is shown at least partially in section and shows its interior in each case.
  • the respective connection channels 76 are visible, which provide a fluid-conducting connection on the one hand on the side of the suction connection 72 and on the other hand on the side of the pressure connection 82 for conveying fluid into or out of the first conveying chamber 46 of the first diaphragm chamber 40 and the second conveying chamber 56 of the second diaphragm chamber 50 enable.
  • the conveying direction of the fluid to be conveyed or the conveyed fluid is determined by the movement of the membranes 42; 52 (not shown) predetermined position of the valve devices 90, 92.
  • the plate valves 90 can be arranged at the respective suction openings 70.
  • the plate valve 90 can be used in the connecting channel 76, which provides a corresponding recess.
  • the plate valve 90 opens the suction opening 70 and the fluid enters the enlarging delivery chamber 46; 56. Meanwhile, a fluid-conducting connection between the delivery chamber 46 or 56 to be filled and the pressure connection 82 is blocked by the flap valve 92 arranged there in the pressure area.
  • the plate valve 90 closes the associated suction opening 70. The flap valve 92 moves into a position so that the fluid-conducting connection between the conveying chamber 46 to be emptied; 56 is released.
  • the plate valve 90 comprises a plate 91a which is preferably made of an elastic material or plastic and is bent in a V-shape.
  • a bore is provided in which a sleeve 91b is held, which can be inserted into the suction opening 70 or the connecting channel 76.
  • Out Figure 7 shows a perspective view of the flap valve 92.
  • the flap valve 92 is designed in a V-shape and has two flap wings 93a, 93b.
  • the material of the flap valve 92 is also an elastic plastic with very good mechanical properties, for example high mechanical strength, rigidity and wear resistance, which are suitable for continuous operation of the flap valve 92.
  • PEEK polyetheretherketone
  • a hinge shaft 94 is held and held, which protrudes with free ends over the wings 93a, 93b.
  • the free ends of the hinge shaft 94 are in a hinge element 95 ( Figure 4 ) snap-in, and freely rotatable therein, so that the flap valve 92 can perform a tilting movement.
  • the hinge element 95 is firmly received in a crossing area between the connecting channels 76 and the outlet channel 84, so that when the hinge shaft 94 is engaged, the flap wings 93a, 93b connected to it alternately one of the fluid-conducting connections to the conveying spaces 46; 56 opens or blocks.
  • FIG 8 a detail of the mechanical drive mechanism is shown in perspective. Shown is the receptacle 100 in which the output shaft 20 of the drive unit (not shown) is rotatably mounted in a bearing 110 provided for this purpose, here designed as a ball bearing.
  • the receptacle 100 forms a type of connecting rod with a ball joint 112, which is regarded as a component of the mechanical drive mechanism.
  • the receptacle 100 corresponds in a certain way to a connecting rod head and largely has a cuboid shape.
  • a slot 102 is formed on one of the side surfaces of the receptacle 100, which slot extends parallel to a base surface of the receptacle 100 and thus perpendicular to the output shaft 20.
  • the slot 102 intersects a threaded hole 104 formed on the side surface.
  • the width of the slot 102 is adjustable.
  • screw means 106 are provided which change the width of the slot 102 depending on the position.
  • the ball joint 112 comprises at one end a ball head 114, from which a threaded shaft 116 extends, at the end of which a threaded area is formed complementary to the threaded bore 104.
  • the ball joint 112 is formed in one piece, a multi-part design is also conceivable. Accordingly, the ball joint 112 can be screwed into the receptacle 100 and held in position by clamping, the width of the slot 102 being adjusted accordingly.
  • a tool holder 118 is formed on the ball head 114 in extension of the threaded shaft 116, in which a tool can be received in a rotationally secure manner. Accordingly, the ball joint 112 can be released from the receptacle 100 with the screw means 106 released. A simple adjustment of the tension of the diaphragm 42 which can be connected to the drive mechanism; 52 possible.
  • the Figure 9 shows a detailed view of the mechanical drive mechanism of the double diaphragm pump 1 in a sectional view.
  • the ball joint 112 is connected to the receptacle 100 via the threaded shaft 116, ie it is screwed into the slotted threaded bore 104.
  • the output shaft 20 designed as an eccentric shaft is received in the bearing 110.
  • the ball head 114 of the ball joint 112 is received in the drive piston 120.
  • the ball head 114 is rotatably mounted in a multi-part bearing block 130, which is received in the drive piston 120 designed as a hollow piston, for example resting against one or more insertable spacers (not shown).
  • the drive piston 120 is constructed in several parts, the parts being connectable to one another by means of a screw connection 121.
  • the drive piston 120 has a through hole 124 on one end face. A tool can be passed through the through bore 124 from the drive space 48 of the first diaphragm chamber 40 to the tool holder 118 on the ball head 114 in order to release the ball joint 112 from the holder 100.
  • spring means 140 can be arranged, which enable the multi-part bearing block 130 to be held in a pretensioned manner.
  • the multi-part bearing block 130 is arranged between spring means 140 so that it can always be reset to its starting position.
  • the overload protection device can also be designed in the form of an electronic overload protection device.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Transmission Devices (AREA)
EP21152179.4A 2020-01-20 2021-01-18 Pompe à double diaphragme Active EP3851674B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH00062/20A CH717057A1 (de) 2020-01-20 2020-01-20 Doppelmembranpumpe.

Publications (2)

Publication Number Publication Date
EP3851674A1 true EP3851674A1 (fr) 2021-07-21
EP3851674B1 EP3851674B1 (fr) 2023-08-23

Family

ID=74187212

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21152179.4A Active EP3851674B1 (fr) 2020-01-20 2021-01-18 Pompe à double diaphragme

Country Status (3)

Country Link
EP (1) EP3851674B1 (fr)
JP (1) JP2021113557A (fr)
CH (1) CH717057A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT34296B (de) * 1907-01-04 1908-09-10 Rudolf Lueftschitz Membranpumpe für Entstaubungsvorrichtungen.
FR585519A (fr) * 1924-09-09 1925-03-03 Pompe électro-magnétique alternative
US3027848A (en) * 1959-07-13 1962-04-03 Gen Motors Corp Diaphragm pump
GB992591A (en) * 1961-12-19 1965-05-19 Arthur Lyon & Co Engineers Ltd Improvements relating to diaphragm pumps
US3291055A (en) * 1965-08-02 1966-12-13 Alexander S Limpert Self-purging proportioning pump for corrosive liquids
DE20109650U1 (de) 2001-06-09 2001-08-23 Abel Gmbh & Co Kg Elektromechanisch angetriebene Doppelmembranpumpe

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2918878A (en) * 1957-12-05 1959-12-29 Symington Wayne Corp Double-acting diaphragm pump
NO871260L (no) * 1987-03-26 1988-09-27 Per Olav Haughom Boreslampumpe med hydraulisk pumpekammer.
US5364234A (en) * 1992-05-20 1994-11-15 Karl Eickmann High pressure devices
DE9420493U1 (de) * 1994-12-08 1995-02-16 ABEL GmbH & Co Handels- und Verwaltungsgesellschaft, 21514 Büchen Doppelmembranpumpe
CN204572401U (zh) * 2015-03-26 2015-08-19 邱列扬 一种高效容积泵

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT34296B (de) * 1907-01-04 1908-09-10 Rudolf Lueftschitz Membranpumpe für Entstaubungsvorrichtungen.
FR585519A (fr) * 1924-09-09 1925-03-03 Pompe électro-magnétique alternative
US3027848A (en) * 1959-07-13 1962-04-03 Gen Motors Corp Diaphragm pump
GB992591A (en) * 1961-12-19 1965-05-19 Arthur Lyon & Co Engineers Ltd Improvements relating to diaphragm pumps
US3291055A (en) * 1965-08-02 1966-12-13 Alexander S Limpert Self-purging proportioning pump for corrosive liquids
DE20109650U1 (de) 2001-06-09 2001-08-23 Abel Gmbh & Co Kg Elektromechanisch angetriebene Doppelmembranpumpe

Also Published As

Publication number Publication date
EP3851674B1 (fr) 2023-08-23
JP2021113557A (ja) 2021-08-05
CH717057A1 (de) 2021-07-30

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