Tecrrrncal Pield

The invention relates to a hydraulically driven universal plunger pump and agitator which can be driven and operated from any optional energy source and which is well suitable for forwarding liquids of different density also containing solid Cdry vegetable) substances. Due to the structural design danger of obturation can be reduced ^" to the minimum, it can be easily moved and arranged in the fluid to be pumped, furtheron, hydraulic drive can be connected to the energy source without any diffi- culty. The equipment forming the object of the in¬ vention can be most advantageously used in agricul¬ ture for lifting and delivering sewage of increased density, slurries, sludges or manure. Owing to the hydraulic drive the plunger pump can be actuated from any energy source having been constructed with a hydraulic system, while its agitator homogenized the fluid to be pumped.

Background art

Several plunger constructions are known which are used for fulfilling the aforementioned, task.

So-called sewage pumps with a vertically arranged pump shaft are frequently used. According to present technical level, the pump of the Swedish company LYGT and the type produced by the West- -German company I10 are similar to the technical solution of the hydraulically driven universal

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plunger pump according to the invention. These types of pumps used to be driven with an electromotor which is built into the pumping head dipped in the wa¬ ter. The drawback of these solutions lies in that their use is bound to the existence of a current sour¬ ce, a properly built mains is required. Investments costs are high.

Plunger pumps of the type VTSZ-200 and ASZ-300 are also known. Their disadvantageous feature lies in that they cannot be operated from a universal energy source, at the same time their scope of operation is restricted by the density of the fluid to be pumped, practically they can be used only for the delivery of high-liquid media, obturation often occurs, resulting in technical difficulties.

The aim of our invention is to eliminate said deficiencies and to develop an improved plunger pump, which is operating with a far better efficiency, than the known solutions. A further task of the invention lies in to develop the drive of the plunger pump as well as to achieve improved operation in the fluid to be pump¬ ed.

Disclosure of the Invention

The invention is based on the recognition, in so far as, the task set can be solved, if the drive of the plunger pump is rendered independent of the mains and simultaneously the inhomogenous fluid of changing density to be pumped is homogenized.

The aim set has been achieved in accordance with the invention by means of the plunger pump des¬ cribed in the preamble in such a manner that there is

an agitator periodically homogenizing the fluid to be pumped, simultaneously the pump and the agitator are provided with hydraulic motors 2.

With a preferred embodiment of the inven- tion pumping head is provided with distance pieces attached to a flange 8, with a whirl-chamber 10 fixed to the distance pieces 9 and thereto a bearing block 11 is connected in a releasable manner. In the bear¬ ing block - supported on bearings - there is the shaft 12, led rotatably, arranged; to one end of said shaft a co-axially arranged, a pump blade disc 13 is releaseably fixed, ^* while to the other end of said shaft, co-axially therewith, a finned sleeve 14 is fixed realizing the connection with a hydraulic motor. In order to achieve increased output, at least two pumping heads of the plunger pump are fixed to a common flange 8, and in the confining pumping heads pump blade discs connected to a common whirl chamber 10 and driven with hydraulic motors ^* 2 with opposite sense of rotation are arranged.

In the majority of the plunger pumps being in compliance with prior art an electromotor is in¬ stalled, however, only expensive electromotors with a complicated design are able to overcome adverse opera- tional circumstances. By using a hydraulic driving mo¬ tor problems of said nature could be eliminated, at the same time the plunger pump can be operated from any type of energy source which has a hydraulic sys¬ tem. With known solutions fluid to be pumped with a changing density and being expressively inhomoge- neoUs, obturation in the pump often occurs.

The equipment according to the invention con¬ tains a plunger pump and an agitator and by means of

the latter one the fluid to be pumped is periodi¬ cally homogenized. Similarly to the pump the agita¬ tor is driven by its own hydraulic motor. By the periodical use of the agitator obturation problems connected to the inhomogeneous fluid to be pumped can be well eliminated. Hydraulic motors of the plunger pump and agitator can be operated from the same energy source. In the period of homogenization the agitator is put into operation by means of the reversing switch having been built into the hydraulic circle, in such a manner obturation of the pump can be avoided.

As the hydraulically driven universal plun¬ ger pump and the agitator are actuated from the ener- gy source of a hydraulic system, formation of stable or mobile machine unit becomes possible. The hydrau¬ lic pipes between the driving hydraulic partial unit and the plunger pump provide for connection; over- bridging of distances of 30 to 40 m becomes also pos- sible. Automatized embodiment of the drive between the driving hydraulic unit and the plunger pump-agita¬ tor is properly protecting the rotating parts of the construction. So e.g. if a solid body which cannot be homogenized arrives at the pump head, at a pre-de- termined overload rotary motion of the pump blade disc arranged in the pump heads can be stopped by means of a relieving valve. The hydraulic partial unit can be driven from any type of energy source.

The Brief Description of the Drawings

The invention will now be discussed more par¬ ticularly with reference to the attached drawings.

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Pigure 1 is showing the schematic arrangement of the plunger pump and the agitator with the hyd¬ raulic part and the energy source;

Pigure 2 is the front view of the plunger pump accord¬ ing to the invention, partly in section;

Pigure 3a and 3b the front and top view of the plunger pump according to the invention;

Pigure 4 a further preferred embodiment of the plun¬ ger pump according to the invention, showing the front view of the pump blade disc, part¬ ly in section;

Pigure schematic front and side view of the agita¬ tor according to the invention; Pigure r O schematic arrangement and electric connec¬ tions with a preferred embodiment of the plun¬ ger pump _. and agitator according to the in¬ vention.

Best Lloάes for Parrying out the Invention

In figure 1 the spaced arrangement of the plunger pump 1 and the agitator 3 in the fluid 6 to be pumped is tobe seen, both the plunger pump 1 and the agitator 3 are driven by the hydraulic motors 2, this latter ones are operated from the hydraulic par¬ tial unit 4, which again is driven from the energy source 5. Within the hydraulic system stream between the hydraulic partial unit 4 and hydraulic motors 2 is established via the hydraulic pipes 7.

Pigure 2 illustrates the front view of the plunger pump 1 according to the invention, partly in section. Suction head of the plunger pump 1 is provi¬ ded with the distance pieces 9 fixed onto the flange

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8 and with a whirl space 10 fixed onto the distance pieces 9; thereto a bearing block .11 is connected in a releasable manner C screwed connection). In the bearing block, supported on radial deep-groove ball bearings and bevel roller bearings, a rotatably led shaft is arranged, wherein to one end of said shaft a co-axially arranged pump blade disc is fixed with a releasable bond C keyed joint), _while to the other end of said shaft, co-axially therewith, a finned sleeve 14 is fixed establishing connection with the hydraulic motor 2. A patent arc 21 is connected to the whirl chamber 10 ensuring tangential and flexible connection.

With a preferred embodiment of the inven- tion at least two suction heads are fixed onto a com¬ mon flange 8 and in the confining suction heads there are the pump blade discs 13 connected with the whirl chamber 10 and driven by the hydraulic motors 2 with an opposite sense of rotation arranged. In dependence of the consistency of the medium 6 to be pumped the pump blade disc 13 is operat¬ ed within the range of ny ber of revolutions between rpm 250 and rp 3000.

In figure 4 the front view of the pump blade disc 13 of the plunger pump 1 according to the inven¬ tion is to be seen, partly in a sectional view. By means of the pump blade-s bent upstream in relation to the sense of rotation progress of different vegetabl dry substances, e.g. rough fodder through the pump can be avoided.

In figure 5 a schematic view of the agita¬ tor according to the invention is given, showing the front and sideview, partly in section. The agitator consists of the bearing block 31, of the shaft having

been arranged co-axially with the symmetry axis, of the screw blade 16 having been fixed with a releasable bond C ey joint) to one end of the shaft, of the labyrinth sealing 17 between the screw blade 16 and the bearing block _. 11, of the fi ned sleeve 2>L connecting the other end of the shaft to the hydraulic motor 2, of the tire IS arranged centrally around the symmetry axis of the screw blade, as well as of the radially arranged rods 19 interconnecting the rim 18 and the bearing block. In relation to the horizontal, angular posi¬ tion of the locking clamp 20 surrounding the bearing block 11 can be adjusted for homogenizing periodically the fluid to be pumped Chomogenization lasting 10 to 15 minutes, performed in 4 hours intervals is to be considered as advantageous).

The hydraulically driven universal plunger pump and the agitator can be used in clear water or in dense liquids with a high dry substance content (.8 to 12 ), as well as for the delivery of slurries, manure, biogas basic materials, paper-pulp, different concent¬ rates in canneries, intermediate products in the chemi¬ cal industry etc.

With arrangements with twin-suction heads or with more, than two suction heads lifting height can be increased; by using the usual dimensions for the partial units, an output of 500 to 1000 lii__e/minute can be achieved. The plunger pump 1 and the agitator 3 can be positioned by means of a chain or any other known lifting means serving for this purpose. When treating slurries being more viscous, than usually, it seems to be advantageous to take the ratio of the inflow cross-section of the suction head and the whirl chamber 10 to 1:1.4.

In figure 6 a preferred embodiment of the

aforementioned apparatuses, i.e. fixed, portable or automatic version thereof, is to be seen, showing the schematic arrangement and electrical connections. Prom the recipient 22 for hydraulic oil with the hydraulic partial unit 4 _. hydraulic oil is supplied through the magnet-filter 23 at a pressure of 100 to l6θ bar into the hydraulic cycle via an inserted stream regulating valve 24. Hydraulic oil is passing through the relieving electromagnetic valve 25 and arrives at the hydraulic oil distributor 26. There¬ from hydraulic oil is fed to three hydraulic motors 2, out of which, two are driving the plunger pump and one the agitator. Start of the hydraulic motors is controlled by means of the magnetic valves 28 built- -in into the forwarding branch 27. Hydraulic oil from the hydraulic motors 2 is led into the oil collector 29 and therefrom into the sump 30. The system can be started manually or in a fully automatized manner.

A further advantage of the solution accord- ing to the invention lies in that structural elements of both of the suction head and the agitator 3, as well as coating of the hydraulic motors 2 can be made of a synthetic material, accordingly operation in an acidic or basic medium becomes also possible.