EP0748938A1 - Dispositif et méthode de pompage de mortier - Google Patents

Dispositif et méthode de pompage de mortier Download PDF

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Publication number
EP0748938A1
EP0748938A1 EP95201647A EP95201647A EP0748938A1 EP 0748938 A1 EP0748938 A1 EP 0748938A1 EP 95201647 A EP95201647 A EP 95201647A EP 95201647 A EP95201647 A EP 95201647A EP 0748938 A1 EP0748938 A1 EP 0748938A1
Authority
EP
European Patent Office
Prior art keywords
piston
closing device
pumping
shut
cylinder
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.)
Withdrawn
Application number
EP95201647A
Other languages
German (de)
English (en)
Inventor
Geurt Gerritsen
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.)
BREMAT BV
Original Assignee
BREMAT BV
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 BREMAT BV filed Critical BREMAT BV
Priority to EP95201647A priority Critical patent/EP0748938A1/fr
Publication of EP0748938A1 publication Critical patent/EP0748938A1/fr
Withdrawn legal-status Critical Current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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/102—Disc valves
    • F04B53/1035—Disc valves with means for limiting the opening height
    • 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
    • F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04B15/02—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/102—Disc valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/1087—Valve seats

Definitions

  • the invention relates to a closing device used, for instance, in pumping thin-fluid mortar using a piston pump, wherein a shut-off body in the open position rests on supports and in the closed position abuts against a seal.
  • a disadvantage of this ball closure device is that in the pumping of thin-fluid mortar which may contain pebbles (gravel), such pebbles may become stuck between the ball and the seat during the discharge of the piston pump. Because the ball can tilt and move laterally, the inlet opening is no longer fully closed. The efficiency of the piston pump decreases in that during discharge of the pump a part of the mortar is forced back into the inlet opening again. In particular the water from the mortar is forced back, giving rise to "dry" sand-gravel plugs which may cause clogging of the piston pump and the lines. Moreover, the ball and the seat are subject to wear if mortar is forced back through a narrow gap during the discharge of the piston pump. The ball may, for instance, no longer be spherical and grooves may form in the seat. As a result, the closing device no longer provides a watertight seal, even if no gravel is stuck between the ball and the seat.
  • pebbles pebbles
  • the object of the invention is to provide a closing device which also functions properly if pebbles are present in the mortar.
  • the invention is characterized in that the shut-off body is movable in a guide between the open and closed position.
  • the sealing face of the shut-off body is pressed straight against the seal. Due to the increasing pressure during discharge of the pump, any pebbles present between the seal and the shut-off body are pushed away.
  • a particularly suitable embodiment of the closing device according to the invention is formed by a guiding cage comprised of at least three bars whose centreline is parallel to the direction of travel of the shut-off body.
  • shut-off body has a cylindrical shape. This provides for a good guiding of the shut-off body in the guiding cage.
  • the seal is formed by a ring having a projecting edge which is directed to the sealing face of the shut-off body.
  • the height of the projecting edge is greater than the diameter of a pebble and the edge is of conical design on its exterior periphery.
  • the invention further relates to a piston pump for pumping, for instance mortar, under high pressure, which is equipped with at least two driven cylinders comprising a closing device both on the inlet side and on the outlet side. Owing to the proper sealing of the closing devices, the pressure in the piston pump can be raised and the efficiency of the pump can be improved.
  • the invention also relates to a method for pumping mortar with a piston pump as described above.
  • the pumping stroke of the second piston is initiated.
  • the first piston after completing the pumping stroke, is moved back at an accelerated pace, in order to be ready to initiate the next pumping stroke just before the end of the pumping stroke of the second piston.
  • the second piston after completing the pumping stroke, is moved back at an accelerated pace.
  • the flow of material in the outlet line does not come to a standstill and no pulsatory action is involved. Setting the material flow into motion again, in particular, is accompanied by high pressure peaks.
  • the drive of the piston pump using a hydraulic pump can be effected advantageously in that all oil is pumped to the delivery side of the first cylinder, while just before the end of the pumping stroke of the first piston, half of the oil is pumped to the delivery side of the second cylinder, and upon completion of the pumping stroke of the first piston, all oil is pumped to the rod side of the first cylinder, while the oil situated on the delivery side of the first cylinder is passed to the delivery side of the second cylinder, and then upon completion of the return stroke of the first cylinder all oil is pumped to the delivery side of the second cylinder.
  • the cycle is repeated, with the first and the second piston changed round. In this way the drive of the piston pump, and hence the pumping of the mortar, takes place without pulsations. Also, the material flow remains in motion continuously, so that the occurrence of peak pressures is prevented.
  • the closing device 1 which is shown in Fig. 1 is arranged behind the inlet opening of a piston pump casing, depicted in part.
  • the outlet opening comprises a similar closing device 1'.
  • the closing device 1, 1' is equipped with a guiding cage which consists of four bars, of which only two 3, 3' are shown.
  • a shut-off body 2 is arranged so as to be freely movable.
  • the shut-off body 2 has a cylindrical shape and is preferably of hollow design. In the open position, the stroke of the shut-off body 2 is limited by a support 6 in the form of two round bars. In the closed position, the shut-off body 2 is pressed against a seal in the form of a ring 4. Owing to the round shape of the bars 3, 3' of the guiding cage and the bars 6 of the supports, the mortar flow is disturbed to the least possible extent during the filling and discharge of the piston pump.
  • the sealing ring 4 can be provided with a projecting edge 5.
  • This projecting edge 5 points to the sealing face of the shut-off body 2. Due to this edge 5 the pressure between the sealing ring 4 and the shut-off body 2 is increased.
  • the sealing ring 4 is manufactured from a hard and impact-resistant material.
  • the height of the projecting edge 5 is greater than the diameter of a pebble and the edge is of conical design on the exterior perimeter thereof.
  • the outlet side of the piston pump also comprises a closing device according to the invention.
  • shut-off body 2 can also have a different, non-cylindrical shape, and so can the bars 3, 3' of the guiding cage.
  • a piston pump 7 is shown in top plan view.
  • This piston pump 7 is equipped with two parallel, driven cylinders 8, 9.
  • a manifold 12 Arranged at the outlet openings of the two cylinders 8, 9 is a manifold 12, which ends in a common duct.
  • both the inlet opening and the outlet opening comprise a closing device 1 and 1', respectively.
  • a particularly suitable method for pumping mortar with a piston pump as described above proceeds as follows. Just before the end of the pumping stroke of the first piston 10, the pumping stroke of the second piston 11 is initiated. Then the first piston 10, after completing the pumping stroke, is moved back at an accelerated pace in order to be ready to initiate the next pumping stroke just before the end of the pumping stroke of the second piston 11. The second piston 11, after completing the pumping stroke, is also moved back at an accelerated pace. As a result, the material flow in the outlet duct 12 does not come to a standstill and no pulsatory action is involved. Setting the material flow into motion again, in particular, is accompanied by high pressure peaks.
  • the piston pump 7 can be equipped with two hydraulic pumps or one hydraulic pump for both cylinders (the hydraulic pump is not shown).
  • a highly advantageous method for pumping mortar with a piston pump comprising a hydraulic pump for driving the cylinders is characterized in that all of the oil is initially pumped to the delivery side of the first cylinder 8. Just before the end of the pumping stroke of the first piston 10, half of the oil is pumped to the delivery side of the second cylinder 9 and the other half still to the first cylinder 8. Upon completion of the pumping stroke of the first piston 10, all of the oil is pumped to the rod side of the first cylinder 8, while the oil located on the delivery side of the first cylinder 8 is guided to the delivery side of the second cylinder 9, so that the second cylinder 9 is also driven.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
EP95201647A 1995-06-16 1995-06-16 Dispositif et méthode de pompage de mortier Withdrawn EP0748938A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP95201647A EP0748938A1 (fr) 1995-06-16 1995-06-16 Dispositif et méthode de pompage de mortier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP95201647A EP0748938A1 (fr) 1995-06-16 1995-06-16 Dispositif et méthode de pompage de mortier

Publications (1)

Publication Number Publication Date
EP0748938A1 true EP0748938A1 (fr) 1996-12-18

Family

ID=8220391

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95201647A Withdrawn EP0748938A1 (fr) 1995-06-16 1995-06-16 Dispositif et méthode de pompage de mortier

Country Status (1)

Country Link
EP (1) EP0748938A1 (fr)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1938418A (en) * 1932-12-24 1933-12-05 Dora B Evans Pump valve
US3412931A (en) * 1966-10-18 1968-11-26 Palmer Pumps Ltd Valved cylinder heads
NL7200881A (fr) * 1971-01-26 1972-07-28
DE2338489A1 (de) * 1973-07-28 1975-02-13 Frieseke & Hoepfner Gmbh Ventilgesteuerte hochdruck-kolbenpumpe
DE2835478A1 (de) * 1978-08-12 1980-02-14 Zahnradfabrik Friedrichshafen Kolbenpumpe fuer hydraulische anlagen
EP0254450A2 (fr) * 1986-07-25 1988-01-27 Titan Tool, Inc. Pompe hydraulique de peinture
DE9000274U1 (de) * 1990-01-12 1990-03-29 WiWa Wilhelm Wagner GmbH & Co KG, 6335 Lahnau Betonpumpe
US5061159A (en) * 1990-08-27 1991-10-29 Pryor Dale H Fluid end for reciprocating pump
US5094596A (en) * 1990-06-01 1992-03-10 Binks Manufacturing Company High pressure piston pump for fluent materials

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1938418A (en) * 1932-12-24 1933-12-05 Dora B Evans Pump valve
US3412931A (en) * 1966-10-18 1968-11-26 Palmer Pumps Ltd Valved cylinder heads
NL7200881A (fr) * 1971-01-26 1972-07-28
DE2338489A1 (de) * 1973-07-28 1975-02-13 Frieseke & Hoepfner Gmbh Ventilgesteuerte hochdruck-kolbenpumpe
DE2835478A1 (de) * 1978-08-12 1980-02-14 Zahnradfabrik Friedrichshafen Kolbenpumpe fuer hydraulische anlagen
EP0254450A2 (fr) * 1986-07-25 1988-01-27 Titan Tool, Inc. Pompe hydraulique de peinture
DE9000274U1 (de) * 1990-01-12 1990-03-29 WiWa Wilhelm Wagner GmbH & Co KG, 6335 Lahnau Betonpumpe
US5094596A (en) * 1990-06-01 1992-03-10 Binks Manufacturing Company High pressure piston pump for fluent materials
US5061159A (en) * 1990-08-27 1991-10-29 Pryor Dale H Fluid end for reciprocating pump

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