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
  • 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

Definitions

• the invention relates to a
• Piston pump for thick materials with at least one motorized or hydraulically driven delivery piston containing delivery cylinder having a mouth opening which communicates in accordance with the movement of the delivery piston slide controlled alternately with the interior of a material feed container and with a pressure conveying line.
• Piston pumps of this type are used to deliver high solids content solid-liquid mixtures, e.g. Sewage sludge, coal sludge, biomass or concrete used. Such thick materials have a high internal friction, so that the degree of filling of the delivery cylinder often leaves something to be desired during the suction process.
• piston pumps of this type EP-B-633863
• to introduce a lubricant between the thick material strand and the wall of the pressure conveying line in the promotion of thick materials to reduce the wall friction at the entrance of the pressure conveying line. This is usually done continuously and proportionally to the flow in metered quantity, with the result that forms an interface between the pipe inner wall and the thick matter strand through which the delivery pressure can be reduced.
• a pre-pressing device is usually provided in the region of the material supply container, with which the filling pressure can be increased by at least 1 bar. In many cases, however, this is not enough.
• the object of the invention is to improve the known piston pump for thick materials in such a way that even with high hen solid contents in the thick material of the degree of filling in the delivery cylinder can be significantly increased.
• the solution according to the invention is primarily based on the idea that in the region of the orifice opening into the delivery cylinder emptying
• Ring nozzle is arranged, which is connected to an external pressure line, wherein the pressure line can be acted upon by a high-pressure pump with a lubricant.
• the pressure line is connected via a arranged in the mouth region of the delivery cylinder bore to an opening into the annular nozzle annular channel.
• a preferred structural embodiment of the invention provides that the delivery cylinder carries an outer ring having at least one connected to the annular nozzle ring channel outside the connected to the pressure line sene bore, wherein the annular channel on the inside by an outer surface of the delivery cylinder or axially adjacent thereto Inner ring and the outside is limited by an inner surface of the outer ring.
• said inner ring engages in an inwardly open recess of the outer ring and limits together with this the annular channel and the annular nozzle.
• the inner ring is advantageously clamped with a rear, radially projecting collar between two mutually facing annular surfaces of the delivery cylinder and the outer ring body.
• the annular channel expediently has at least one annular Cross-sectional expansion before.
• two spaced apart annular cross-sectional extensions are provided.
• a responsive to the position and / or the stroke direction of the delivery piston in the delivery cylinder control means and arranged in the pressure line, responsive to an output of the control means control valve is provided which opens during the suction stroke of the delivery piston and before the pressure stroke closes.
• the control valve is expediently formed as preferably via the delivery piston magnetically controllable directional control valve.
• a preferred embodiment of the invention provides that two delivery cylinders, each having an annular nozzle in its mouth region, are provided, the annular nozzles of which can be supplied with lubricant via the control valve during each intake stroke of the delivery pistons actuated in push-pull.
• the invention also relates to a method for operating a piston pump for thick materials, in which in a suction stroke thick material alternately sucked into a delivery cylinder open on one side and is pressed in a subsequent pressure stroke from the delivery cylinder in a pressure conveying line.
• a lubricant be injected into the delivery cylinder with each suction stroke.
• the lubricant is advantageously injected into the separation area between the thick material and delivery cylinder inner surface, over its entire circumference.
• the lubricant injection is interrupted during the pressure stroke appropriate.
• the lubricant is injected with an overpressure relative to the thick stock arranged in the delivery cylinder.
• the injection pressure is expediently more than 50, preferably about 100 bar, while the - A - pressure in the thick material material during the suction stroke expediently at about 2 bar.
• a preferred embodiment of the invention provides that in the case of a two-cylinder piston pump, the piston in a first and a second delivery cylinder are driven in push-pull execution of a suction stroke and a pressure stroke, wherein in the delivery cylinder at each suction stroke, a lubricant is injected and the lubricant injection is interrupted during the respective printing stroke.
• the lubricant layer forming in the delivery cylinder is entrained into the pressure delivery line, so that in a first line section adjoining the slurry pump an additional lubricant injection is dispensed with. Only with long pressure conveying lines with more than 50 to 100 m in length can be injected at a distance from the sludge pump additional lubricant in the pressure conveying line. While the lubricant is injected into the delivery cylinder only during the suction stroke, the lubricant injection into the delivery conduit should be continuous.
• FIG. 1 is a plan view of a two-cylinder piston pump for thick materials for connection to a delivery line.
• Fig. 2a and b is a plan view and a sectional view of the two-cylinder piston pump of Figure 1 in an enlarged view without material feed container. 3 shows an enlarged detail of the sectional view of Fig. 2b.
• FIG. 4 shows a section through the mouth region of one of the delivery cylinders in an enlarged representation compared to FIG. 3.
• the two-cylinder slurry pump shown schematically in Fig. 1 is for the promotion of solids-thickers, such. of partially dewatered sewage sludge, coal dust sludge or concrete.
• the piston pump consists essentially of a material feed container 10, two with their frontal orifices 12 via wall openings 14 connected to the material feed container 10 feed cylinders 16, two in the feed cylinders 16 in push-pull via hydraulic drive cylinder 18 drivable delivery piston 20 and one between the drive cylinders 18 and the delivery cylinders
• a pipe slide 21 is arranged, with its inlet opening 26 alternately to the mouth opening 12 of the delivery cylinder whose piston performs a pressure stroke, can be connected and the mouth opening 12 of the other delivery cylinder whose piston is a suction stroke executes, leaves, and the outlet opening 28 is connected via a arranged on the material feed container 10 discharge nozzle 30 to a pressure conveying line, not shown.
• the sleeve valve 24 to a pivotable within the material supply container 10, 'S-shaped curved pivot pipe. Accordingly, at each suction stroke thick matter material from the interior of the material feed container 10 optionally under the exercise of a pre-pressure on the open mouth opening 12 in the respective delivery cylinder 16, while in the other delivery cylinder 16, the thick material located there through the delivery piston 20 under execution of a pressure stroke on the pivot tube the pipe slide 24 and the discharge nozzle 30 is pressed into the subsequent pressure conveying pipe.
• a special feature of the invention is that in the region of the mouth opening 12, an annular nozzle 32 is arranged, which can be acted upon via pressure pipes 34 holes 36 and an annular channel 38 with a lubricant under a pressure of about 50 to 100 bar.
• an inner tube 40 which is overlapped by an outer tube 42 screwed onto the delivery cylinder 16, adjoins the delivery cylinder 16 in the region of the orifice opening 12 axially.
• the inner ring 40 has a radially projecting collar 44 which is clamped between an annular surface 46 of the outer tube 42 and the end face 48 of the delivery cylinder 16 so that the annular nozzle 32 and the annular channel 38 between the inner tube and outer tube remains open.
• the holes 36 for the lubricant supply are arranged in the outer tube 42.
• the inner tube 40 has on its annular surface 38 bounding the inner surface of two annular grooves, which form a cross-sectional widening 50 and provide for a uniform distribution of the exiting from the annular nozzle 32 lubricant over the circumference.
• an external, not shown, control device is controlled so that only in the suction stroke lubricant is injected into the delivery cylinder.
• the lubricant passes there into the separation area between thick material and randomlyzylinde- inner surface, so that the degree of filling is improved due to the reduced sliding friction.
• an improvement of the degree of filling of at least 25% can be achieved with the inventive measures in solids-rich sewage sludge.
• the lubricant enters the pressure line with the thick material and also reduces the sliding friction there and thus the delivery pressure required for the material transport.
• the lubricant injection is interrupted in each case. This is the danger of a Leersaugens avoided the Gleitmiteltechnisch by passing thick matter.
• the invention relates to a piston pump for thick materials, in particular for solids-rich sewage sludge, coal sludge and concrete.
• the piston pump has at least one delivery cylinder 16 containing a motor-driven or hydraulically driven delivery piston 20, which has an orifice opening 12 which, in accordance with the movement of the delivery piston 20, alternately communicates with the interior of a material feed container 10 and with a pressure delivery line 30 in a slide-controlled manner in accordance with the movement of the delivery piston 20.
• annular nozzle 32 which opens into the delivery cylinder 16 in the region of the discharge opening 12 is provided, which is connected to an external pressure line 34 that can be acted upon by a lubricant.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Reciprocating Pumps (AREA)
• Details Of Reciprocating Pumps (AREA)
• Pistons, Piston Rings, And Cylinders (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=38102553

Family Applications (1)

Country Status (8)

Families Citing this family (14)

Family Cites Families (12)

• 2006
  • 2006-04-04 DE DE102006016083A patent/DE102006016083A1/de not_active Withdrawn
• 2007
  • 2007-03-23 US US12/225,775 patent/US20100232996A1/en not_active Abandoned
  • 2007-03-23 DE DE502007005346T patent/DE502007005346D1/de active Active
  • 2007-03-23 JP JP2009503453A patent/JP5202512B2/ja not_active Expired - Fee Related
  • 2007-03-23 WO PCT/EP2007/002572 patent/WO2007115665A1/fr not_active Ceased
  • 2007-03-23 CN CNA200780011201XA patent/CN101410619A/zh active Pending
  • 2007-03-23 CA CA002647794A patent/CA2647794A1/fr not_active Abandoned
  • 2007-03-23 AT AT07723523T patent/ATE484676T1/de active
  • 2007-03-23 EP EP07723523A patent/EP2002121B1/fr not_active Not-in-force

Non-Patent Citations (1)

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