Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
  • F04C15/06—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
  • F04C15/064—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston machines or pumps
  • F04C15/066—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston machines or pumps of the non-return type
• • 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
  • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
  • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
  • F04B1/14—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
  • F04B1/141—Details or component parts
• • 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
  • F04B53/007—Cylinder heads
• • 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
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
  • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
  • F05C2225/00—Synthetic polymers, e.g. plastics; Rubber

Definitions

• the invention relates to a piston pump for a high-pressure cleaning device with a pump housing, in which at least one pump chamber with an inlet valve and an outlet valve is arranged, in which a recurrently driven piston plunges in a sealed manner, the pump housing comprising a pump block and a pump head, which lie close to each other on a separating surface, the pumping chambers and / or connecting lines penetrating the separating surface in a sealed manner and in the region of the separating surface receiving insertable inserts into the pumping chambers and / or the connecting lines, which in the inserted position between the pump block and the Pump head are set.
• the inserts in the pumping chambers and connecting lines are therefore not fixed by being clamped between the pump head and pump block, but rather the inserts are permanently welded to the wall of the pump head or the pump block surrounding them.
• the pump block and pump head at least in the area of the separating surface, consist of a nem softenable plastic material and are connected to each other by a weld at the interface.
• the welding is sufficient to permanently connect the pump block and pump head to one another, in particular with a view to the fact that the forces in the contact area between the pump head and the pump block are reduced in that the inserts in the connecting lines and / or the Pump chambers are fixed by welding.
• the pump housing has a connection for the suction of a chemical with a valve insert, which is inserted into a receptacle of the pump housing, and that the valve insert and the receptacle, at least in its contact area, consist of a softenable plastic material and in this contact area are connected to each other by a weld.
• a valve insert is fixed in a receptacle by welding softenable plastic materials not only in the area of the separating surface, but also with other valve inserts, in this case with a valve insert for a chemical suction.
• the welding can be carried out in various ways, for example the welding can be an ultrasonic welding, a vibration welding, a friction welding or a mirror welding.
• the parts to be welded are moved against one another with a small amplitude and high frequency, for example rotated relative to one another about the longitudinal axis of the pumping chamber or the connecting line, and this movement causes such a strong heating in the contact area that the plastic material both the surrounding wall and of use melts.
• the molten plastic materials mix and form a reliable weld between the insert and the surrounding wall after cooling and the associated solidification.
• This welded joint not only has the advantage that the inserts are permanently fixed in the inserted position in the pumping chamber or the connecting line, but all axial forces are also absorbed via the welded joint, so that no axial forces are present in the area of the interface between the pump head and the pump block must be transmitted, which could lead to a "breathing" of the pump housing during operation. Finally, there is an optimal seal between the insert and the surrounding wall, so that additional seals can be dispensed with in this area, for example it is no longer necessary to arrange O-ring seals on the outer circumference of the inserts.
• the parts to be welded are moved against one another at a frequency which is substantially lower than that of ultrasonic welding, namely by vibrating one of the two parts to be welded relative to the other.
• the relative movement that occurs and the friction between the parts to be welded result in heating. tion that softens the material to be welded.
• thin heating elements are introduced in the area of the contact surface of the two parts to be connected, which are removed after the adjacent material has melted. The melted material can then mix intimately with one another and form the welded joint.
• the thin heating elements could, for example, be designed in the manner of a sector diaphragm, which are drawn radially inward into the interior of the insert after the material has been heated and then after the weld connection has been formed from the insert can be pulled out.
• the insert is a sleeve.
• the edge of the sleeve facing away from the separating surface is designed as a sealing seat for a valve body.
• a valve body exerts large forces on its sealing seat in the axial direction; these forces can be introduced by the insert directly into the surrounding wall by means of ultrasonic welding, without this forces are transmitted to the other part of the pump housing.
• the sleeve is designed as a sealing sleeve and protrudes beyond the separating surface.
• the protruding part can then be immersed in corresponding parts of the pumping chambers or connecting lines in the other part of the pump housing and there effect a seal in the separating surface area.
• a particularly favorable embodiment is one in which it is provided that the insert and the pumping chamber or connecting line receiving it bear ring shoulders which abut against one another when the insert is inserted and, after the material has been thermally softened by the ultrasonic welding, deformed and welded to one another when the insert is further inserted become.
• the ring shoulders abut each other in the direction of insertion, during ultrasonic welding and the micro-movement of the two parts produced thereby, the ring shoulders are heated in this contact area so that the material melts and mixes in this area.
• an optimal material penetration and thus a reliable sige welded connection which extends in the axial direction practically over the entire insertion depth of the insert, starting with the first contact of the ring shoulders of the insert or the pumping chambers or connecting line.
• ring grooves into the mutually facing wall parts of the insert or the pumping chambers or connecting lines, these ring grooves serve to hold molten material and additionally lead to a form-fitting and material-fitting connection of the insert to the surrounding wall.
• Figure 1 a longitudinal sectional view through a
• Piston pump for a high pressure cleaning device
• FIG. 2 is an enlarged detail sectional view of the pump block with an attached ultrasonic welding tool before performing the weld and
• Figure 3 a view similar to Figure 2 without
• Ultrasonic welding tool after performing the ultrasonic welding.
• the high-pressure pump 1 shown in the drawing comprises a housing 2 with a pump block 3 and a pump head 4.
• Pump block 3 and pump head 4 lie flat against one another along a flat separating surface 5 and are clamped against one another by means of clamping means not shown in the drawing, for example by screws.
• the pump block 3 accommodates pump chambers 6, into each of which a cylindrical piston 7 is immersed.
• This piston 7 is sealed off from the pump chamber 6 by suitable seals 8, 9, 10.
• the piston 7 is oscillatingly inserted into the pumping chamber 6 by a swash plate (not shown in the drawing) and pulled out of it again by a helical spring 11 surrounding it, so that the volume of the pumping chamber 6 changes periodically.
• the pump chamber 6 is connected via a connecting line 12 which leads through the separating surface 5 to a suction line 13 which is located in the pump head 4.
• a connecting line 14 leads from the pumping chamber 6 through the separating surface 5 to a pressure line 15 in the pump head 4; a high-pressure line connects to this pressure line 15.
• device 16 through which conveyed cleaning medium is transported in a manner known per se to a dispensing device, for example a spray lance.
• the connecting lines 12 and 14 are sealed against one another in the area of the separating surface 5 by sleeve-shaped inserts 17, 18, which dip into the connecting lines 12 and 14 on both sides of the separating surface 5 and there, in part, via O-ring seals 20 inserted in circumferential grooves 19 for sealing effect surrounding wall.
• the insert 17 in the connecting line 12 is essentially a cylindrical sleeve, the edge 21 facing the pump chamber 6 is designed as a sealing seat for a longitudinally displaceable valve body 22 which is pressed against the edge 21 by a compression spring 23. This arrangement forms a suction valve for the pump chamber 6.
• the sleeve-shaped insert 17 is provided on its outside with a plurality of steps or ring shoulders 24, which have a very small extension in the radial direction and correspond to the projecting ring shoulders 25 on the inner wall 26 of the connecting line 12.
• the melted material of the annular shoulders 24 and 25 mixes, and the axial feed exerted by the ultrasonic welding tool 27 allows the insert 17 to be gradually pushed deeper into the connecting line 12, with a mixing of the melted material from the inner wall 26 on the one hand and the insert 17 on the other hand in the contact area results.
• the insert 17 is pushed into the connecting line 12 by a certain feed distance, for example by 1 to 5 mm, and such a insertion height results in a welded connection which, after the material has cooled, not only the insert 17 in the connecting line 12 reliably sets, but also causes an all-round sealing of the insert 17 against the surrounding inner wall 26.
• FIG. 2 shows the state of the insert 17 before the welding process, in FIG. 3 after the welding process has ended.
• the areas in which the material of the insert on the one hand and the inner wall 26 on the other hand mix to form a welded connection are shown only very schematically in that either the insert or the inner wall is shown. In fact, the materials mix in the contact area and then belong to both the insert and the inner wall.
• the insert 18 is designed as a sleeve-shaped connecting piece, which bridges the connecting line 14 in the region of the separating surface 5 and is sealed off from the inner wall of the connecting line 14 both in the pump block 3 and in the pump head 4 via O-ring seals.
• This insert 18 is pressed and welded into the pump block end of the connecting line 14 in a manner similar to the insert 17 by means of ultrasonic welding. It would be entirely possible to omit the O-ring seal on the pump block side of the insert 18, since the welded connection already provides a reliable seal.
• a compression spring 28 is supported on the end of the sleeve-shaped insert 18 facing the pump chamber 6, which pushes a valve body 29 against a sealing seat 30 on the pump block side.
• This arrangement forms a pressure valve of the pump chamber 6, and this arrangement also leads to a high axial application of force to the sleeve-shaped insert 18. These axial forces are also completely into the pump block 3 by the welded connection initiated so that no axial forces are transmitted to the pump head 4 in this case either.
• pump block 3 and pump head 4 can be made of a softenable plastic material which can be welded in a manner similar to that when the inserts are connected to the Pump block is the case.
• the inserts are connected to the pump block by means of ultrasonic welding, but in the case of modified exemplary embodiments this connection can also be carried out by welding of a different type, in particular by vibration welding, friction welding or by mirror welding.
• connection technology described can also be used at other points in the pump housing, for example for fixing a valve insert 31 in a receptacle 32 on the pump head 4; this valve insert is switched into a chemical suction line.
• This valve insert 31 consists, at least in the area of contact with the receptacle 32, as well as this from a softenable plastic material, so that both parts can be permanently connected to one another by welding.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Details Of Reciprocating Pumps (AREA)
• Cleaning By Liquid Or Steam (AREA)
• Reciprocating Pumps (AREA)
• Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
• Lining Or Joining Of Plastics Or The Like (AREA)
• Compressor (AREA)

Applications Claiming Priority (3)

Publications (2)

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ID=7854587

Family Applications (1)

Country Status (10)

Families Citing this family (16)

Family Cites Families (9)

• 1998
  • 1998-01-14 DE DE19801146A patent/DE19801146C1/de not_active Expired - Lifetime
  • 1998-12-01 DE DE59803886T patent/DE59803886D1/de not_active Expired - Lifetime
  • 1998-12-01 EP EP98966605A patent/EP1047878B1/fr not_active Expired - Lifetime
  • 1998-12-01 ES ES98966605T patent/ES2175856T3/es not_active Expired - Lifetime
  • 1998-12-01 JP JP2000540374A patent/JP2002509225A/ja active Pending
  • 1998-12-01 AU AU24128/99A patent/AU2412899A/en not_active Abandoned
  • 1998-12-01 WO PCT/EP1998/007791 patent/WO1999036700A1/fr active IP Right Grant
  • 1998-12-01 DK DK98966605T patent/DK1047878T3/da active
  • 1998-12-01 CN CN98813136A patent/CN1110634C/zh not_active Expired - Lifetime
  • 1998-12-01 AT AT98966605T patent/ATE216465T1/de active
• 2000
  • 2000-07-13 US US09/615,401 patent/US6428291B1/en not_active Expired - Lifetime

Non-Patent Citations (1)

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