EP0485862B1 - Pompe pour matière épaisse ayant un couple de cylindres aspirant et refoulant alternativement - Google Patents

Pompe pour matière épaisse ayant un couple de cylindres aspirant et refoulant alternativement Download PDF

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Publication number
EP0485862B1
EP0485862B1 EP19910118826 EP91118826A EP0485862B1 EP 0485862 B1 EP0485862 B1 EP 0485862B1 EP 19910118826 EP19910118826 EP 19910118826 EP 91118826 A EP91118826 A EP 91118826A EP 0485862 B1 EP0485862 B1 EP 0485862B1
Authority
EP
European Patent Office
Prior art keywords
slide
cylinder
branch
valve housing
central channel
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
EP19910118826
Other languages
German (de)
English (en)
Other versions
EP0485862A1 (fr
Inventor
Andrej Simnovec
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.)
Friedrich Wilhelm Schwing GmbH
Original Assignee
Friedrich Wilhelm Schwing GmbH
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
Priority claimed from DE4102682A external-priority patent/DE4102682C2/de
Application filed by Friedrich Wilhelm Schwing GmbH filed Critical Friedrich Wilhelm Schwing GmbH
Publication of EP0485862A1 publication Critical patent/EP0485862A1/fr
Application granted granted Critical
Publication of EP0485862B1 publication Critical patent/EP0485862B1/fr
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
    • F04B7/00—Piston machines or pumps characterised by having positively-driven valving
    • F04B7/0019—Piston machines or pumps characterised by having positively-driven valving a common distribution member forming a single discharge distributor for a plurality of pumping chambers
    • F04B7/0026—Piston machines or pumps characterised by having positively-driven valving a common distribution member forming a single discharge distributor for a plurality of pumping chambers and having an oscillating movement
    • 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
    • F04B7/00—Piston machines or pumps characterised by having positively-driven valving
    • F04B7/0084—Component parts or details specially adapted therefor
    • F04B7/0088—Sealing arrangements between the distribution members and the housing
    • F04B7/0092—Sealing arrangements between the distribution members and the housing for oscillating distribution members

Definitions

  • the invention relates to a thick matter pump according to the preamble of claim 1.
  • the thick matter to be conveyed by the pump according to the invention can have different material compositions, the thick matter conveyed in each case generally representing a mixture of different substances.
  • they are mushy masses with a more or less large water content, e.g. sewage sludge, mortar or the like
  • the invention relates to concrete pumps with which the liquid mixture consisting essentially of sand, cement, aggregates and water has to be pumped over mostly considerable distances and differences in height.
  • the thick matter pump according to the invention works with delivery cylinders, the reciprocating pistons of which, when returning, fill the cylinder with the thick matter mostly sucked in from a prefilling container through the slider housing and press it into the delivery line through the slide into a delivery line fixed to the frame.
  • two delivery cylinders always work together in such a way that one delivery cylinder is filled and the other delivery cylinder is emptied into the delivery line, so that the suction and pressure strokes of both pistons overlap.
  • the invention can therefore be applied to more than just a pair of feed cylinders can be used if a closer coverage of the delivery strokes is desired.
  • the delivery and intake flows are controlled by the slide, which has a branch channel for each delivery cylinder, which connects the cylinder to a central channel leading into the delivery line during the delivery stroke, but at the same time releases the opening of the cylinder with the intake piston, into which the sucked-in thick matter flows past the slide.
  • additional branch channels must generally be arranged for the respective additional delivery cylinders. The invention is described in more detail below with reference to its preferred embodiment, which is designed as a two-cylinder thick matter pump.
  • the openings of the branch channels of the slide communicating with the respective cylinders must seal on the wall of a slide valve housing, so that on the one hand, when the thick matter is sucked in, an overflow of the thick matter flow under the pressure of the conveying piston must be completely or partially is avoided in the suction cylinder and, on the other hand, cannot flow back into the prefilling container when the thick matter is conveyed.
  • thick matter pumps which are generally required to have a simple construction and, in particular, are not exposed to excessive malfunctions due to wear or failure of functionally necessary assemblies, despite their intricate mode of operation and their demands on the conveying operation, particularly over longer conveying paths and conveying heights ensure that the thick matter is conveyed as continuously as possible.
  • the invention is based on this problem.
  • a thick matter pump of the type described above (DE-OS 27 21 678), which has a slide in the form of a V-shaped downpipe, in which the branch channels form the prongs of a fork and the longitudinal axis of the central tube is the geometric axis which swivels the slide during operation of the pump.
  • the pipe fork results from the distance between the parallel arranged or aligned feed cylinders in the embodiment as a two-cylinder thick matter pump.
  • the downpipe design of the slider is also suitable for four-cylinder high-density pumps, in which case the delivery cylinder pairs must be aligned and convey two delivery cylinders at the same time.
  • the free ends of the two channels are curved, with an opening on each of the two control sealing surfaces sealing in the embodiment as a two-cylinder high-density pump, while the other establishes the connection with the delivery cylinder.
  • the control sealing surfaces are therefore flat and therefore attached to the bottom of a prefill container.
  • the object of the invention is to avoid such disadvantages and, moreover, to achieve effects which have a favorable effect on the problem mentioned at the outset.
  • the alignment of the branch channels ensures that their openings are practical when they are projected perpendicularly onto one another cover up. This has the effect that the majority of the reaction forces cancel each other out. All that remains is a reaction force that results from the lack of overlap on a partial area. This can occur if the cylinder openings are to move closer together, which is cheap because of the space required, but only insignificantly interferes with the compensation of the reaction forces.
  • the alignment of the branch channels results in a central symmetry of the slide in the longitudinal plane of the central channel as a result of the same length of both partial channels, which enables the cylindrical shape of the control sealing surfaces when the slide movement is pivoting.
  • the branch ducts can then be designed with straight ends, which is favorable from the point of view of flow and also leads to a simplification of the seal, because the gap between the opening of the branch duct and the control sealing surface assigned to it or in the opening does not change during the pivoting movement.
  • the invention has the significant advantage that it enables a previously unattainable lightweight design by eliminating the heavy mounting of the slide and its drive shaft in the housing, as well as a reliable and less fault-prone sealing of the slide in the slide housing.
  • Thick matter pumps according to the invention can therefore i.a. Delivered cheaply in a small version and can also be used at small construction sites with considerable profits for the rationalization of thick matter production.
  • the branch channels are exactly aligned and therefore the Slider designed free of reaction forces. This results in the exact T-shape of the channels in the slide.
  • the cylindrical shape of the control sealing surfaces is extended to the shape of the entire valve housing. This results in a centrally symmetrical housing shape that is favorable in terms of production technology. This has another significant advantage in operation. While in the known slides, which have the tube shape provided in this embodiment of the invention, a rear wave forms behind each branch tube in the course of the pivoting movements due to the toughness of the thick material, this is not the case in the embodiment described in claim 3, because the free Housing space in front of and behind each branch pipe remains the same and therefore corresponds exactly to the amount of thick matter displaced by the leading branch pipe. The result of this is that there is no rear wave in the valve housing and therefore no depression in the thick material. Such depressions have to be reversed by the delivery piston in the delivery cylinder before the delivery flow begins. This leads to uneven funding and is therefore unfavorable. This disadvantage is avoided in the invention.
  • the invention with the features of claim 4 can also be carried out in such a way that no quantities of thick matter need to be displaced in the valve housing. Then the slide receives a fully cylindrical shape, which can be realized without excessive weight increase of the slide due to the effects of the inventions.
  • the thick matter pump generally designated (1) is designed as a two-cylinder piston pump. They result in two parallel, alternately conveying and sucking conveying cylinders (2, 3).
  • the pistons of the delivery cylinders (2, 3), not shown, are moved in counter-clockwise motion via their piston rods by pistons (likewise not visible) in hydraulic drive cylinders (4, 5).
  • a slide (6) (Fig. 1) leads in the operation of the pump (1) swiveling movements and each has a branch channel and a central channel (9). The pivoting movement takes place around the geometric axis of the central channel (9) with the aid of a shaft (10) which lies in an axial-radial bearing (11) and penetrates the bottom (12) of the valve housing.
  • one of the branch channels (7, 8) is alternating, in the exemplary embodiment of FIG. 1 the branch channel (7) with one of the two elbows (14, 15), ie in the exemplary embodiment via the elbow ( 14) aligned with the cylinder (2), whereby the connection to the central channel (9) is established.
  • the central channel is rotatably aligned with a central bowl coupling (16) with the end of the delivery line, not shown, which is designed as a bend (17).
  • the second branch channel (8) of the slide is released with the release of the suction feed cylinder, i.e. sealed the opening of the manifold (15) on a control sealing surface (18).
  • This is formed on the inner wall (19) together with a second control sealing surface (20) of a valve housing (21).
  • sealing takes place by means of an axially movable tubular ring (22), which has a metal face (33) on the inner wall of the housing with its cylindrical face (20) of the housing, and the inner end of the tubular ring is on the outside of the branch channel (7 ) guided and sealed with a gasket (24) enclosed on practically four sides except for an inner surface.
  • the slurry to be conveyed flows to the slide housing (21) through a prefilling container (25) which has a cylindrical attachment (26) and a conical one Has funnel (27), the retracted end of which is aligned with the upper end of the cylindrical slide valve housing (27).
  • the housing in turn has two openings (28 and 29).
  • the respective opening (28 or 29) opened by one or the other branch channel (7, 8) allows the thick matter contained in the prefilling container (25) to flow through the valve housing into the suction cylinder (3 or 2).
  • the clear openings of the branch channels (7, 8), i.e. the pipe slide (22) are the same among themselves.
  • the branch channels (7, 8) have the same length.
  • branch channels (7, 8) are exactly aligned in the embodiment shown in FIGS. 1 to 4. They each enclose an exact right angle with the central channel, so that there is a T-shape in which the straight cross-section is formed by the two branch channels (7, 8) and the cross-section with the one enclosing the central channel, in the plane of Transverse strand lying and with this right angle enclosing longitudinal strand (30) is composed of the T-shape.
  • the pipe surfaces (31 and 32) of the branch channels (7, 8) at (33) converge, which is on the Central axis of the longitudinal strand takes place.
  • the embodiment according to FIG. 5 differs from this by a transverse strand (34) running from the plane of the T-shape of the slide to one side at an acute angle, which leads to the housing openings (28 and 29) moving closer together and this means that the parallel feed cylinders (2, 3) are at a smaller distance from each other.
  • the slide has the shape of a solid cylinder (35) in which the transverse channels (7, 8) as well as at least the part of the central channel (9) adjoining the transverse strand are recessed.
  • This solid cylinder is guided in the cylindrical housing (21) with rotational play. Push it through, as can be seen in Fig. 6, centrally the recesses for the channels (7-9). He also has an edge recess (36) as a suction path along the cylinder wall (21), which is indicated by an arrow (37) and ensures that the suction cylinder can be filled with thick matter from the prefilling container (25).
  • the slide housing (21) is designed as a hollow cylinder, the axis of which coincides with the axis of the central channel (9) and the cylinder wall (21) of which the openings (28, 29) described for the delivery cylinders (2, 3) into the control sealing surfaces ( 18, 20) of the branch channels (7, 8), an upper opening of the hollow cylinder, which is shown at (39) in FIG. 3, being aligned with the lower opening of the prefilling container (21). The opening opposite it is closed except for the shaft passage.

Claims (4)

  1. Pompe à liquides épais (1) munie de cylindres transporteurs (2, 3) disposés par paires, de préférence parallèlement, refoulant et aspirant tour à tour, d'une vanne (6) qui pivote autour de l'axe d'un canal central (9) en reliant ainsi par un canal de dérivation (7), pour chaque paire de cylindres transporteurs, tour à tour le cylindre refoulant correspondant à une conduite transporteuse (17) fixe sur le bâti par le canal central (9) articulé à celle-ci, tandis qu'en même temps un deuxième canal de dérivation (8) de la vanne libère le cylindre transporteur aspirant tout en étant obturé par une surface étanche de commande (18, 20) associée à chaque canal de dérivation et qui est formée sur la paroi interne d'un carter de vanne (21) dans lequel arrive le liquide épais et qui présente les ouvertures (28, 29) pour les cylindres transporteurs (2, 3), des pressions identiques apparaissant dans les canaux de dérivation (7, 8) qui présentent la même longueur, caractérisée en ce que les canaux de dérivation (7, 8) sont sensiblement alignés et forment un angle droit avec le canal central (9) et en ce que les surfaces étanches de commande (18, 20) du carter de vanne (21) sont incurvées de manière cylindrique.
  2. Pompe à liquides épais selon la revendication 1, caractérisée en ce que les canaux de dérivation (7, 8) forment une branche transversale qui présente avec le canal central (9) la forme d'un T.
  3. Pompe à liquides épais selon l'une des revendications 1 ou 2, caractérisée en ce que le carter de vanne (21) forme un cylindre creux dont l'axe coïncide avec l'axe du canal central (9) et dont la paroi cylindrique (19) présente les ouvertures (28, 29) pour les cylindres transporteurs (2, 3) et, à l'intérieur, les surfaces étanches de commande (18, 20) pour les canaux de dérivation (7, 8), une ouverture supérieure (39) du cylindre creux débouchant dans un réservoir de préremplissage (25) tandis que l'ouverture opposée du carter de vanne (21) est fermée.
  4. Pompe à liquides épais selon l'une des revendications 1 à 3, caractérisée en ce que la vanne (6) est sous forme d'un cylindre plein qui est guidé avec un jeu de rotation sur la paroi cylindrique (19) du carter de vanne (21) et qui présente des évidements centraux pour les canaux de dérivation (7, 8) et le canal central (9) ainsi qu'au moins un évidement latéral (36) sous forme de voie d'aspiration le long de la paroi cylindrique (19) du carter de vanne (21).
EP19910118826 1990-11-16 1991-11-05 Pompe pour matière épaisse ayant un couple de cylindres aspirant et refoulant alternativement Expired - Lifetime EP0485862B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4036623 1990-11-16
DE4036623 1990-11-16
DE4102682 1991-01-30
DE4102682A DE4102682C2 (de) 1990-11-16 1991-01-30 Dickstoffpumpe mit paarweise abwechselnd fördernden und ansaugenden Förderzylindern

Publications (2)

Publication Number Publication Date
EP0485862A1 EP0485862A1 (fr) 1992-05-20
EP0485862B1 true EP0485862B1 (fr) 1993-08-04

Family

ID=25898569

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910118826 Expired - Lifetime EP0485862B1 (fr) 1990-11-16 1991-11-05 Pompe pour matière épaisse ayant un couple de cylindres aspirant et refoulant alternativement

Country Status (4)

Country Link
EP (1) EP0485862B1 (fr)
JP (1) JPH04265478A (fr)
BR (1) BR9104958A (fr)
ES (1) ES2047368T3 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1813854A1 (de) * 1968-12-11 1970-07-09 Schwing Friedrich Wilh Kolbenpumpe mit hydraulischem Antrieb zum Foerdern von Beton
DE1963875C3 (de) * 1969-12-20 1975-10-23 Friedrich Dipl.-Ing. 4680 Wanne-Eickel Schwing Kolbenpumpe mit hydraulischem Antrieb zum Fördern von Beton
GB1397778A (en) * 1972-08-09 1975-06-18 Winget Ltd Slurry pumps
GB1585073A (en) * 1976-05-15 1981-02-25 Ackermann R A Pumping devices

Also Published As

Publication number Publication date
EP0485862A1 (fr) 1992-05-20
ES2047368T3 (es) 1994-02-16
BR9104958A (pt) 1992-06-23
JPH04265478A (ja) 1992-09-21

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