EP0512138A1 - High pressure water pump for purified water - Google Patents

High pressure water pump for purified water Download PDF

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Publication number
EP0512138A1
EP0512138A1 EP91107357A EP91107357A EP0512138A1 EP 0512138 A1 EP0512138 A1 EP 0512138A1 EP 91107357 A EP91107357 A EP 91107357A EP 91107357 A EP91107357 A EP 91107357A EP 0512138 A1 EP0512138 A1 EP 0512138A1
Authority
EP
European Patent Office
Prior art keywords
water pump
pressure water
pump according
cylinder liner
piston
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.)
Granted
Application number
EP91107357A
Other languages
German (de)
French (fr)
Other versions
EP0512138B1 (en
Inventor
Wolfram Wittkop
Ulrich Samland
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.)
Hauhinco Maschinenfabrik G Hausherr Jochums GmbH and Co KG
Original Assignee
Hauhinco Maschinenfabrik G Hausherr Jochums GmbH and Co KG
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 Hauhinco Maschinenfabrik G Hausherr Jochums GmbH and Co KG filed Critical Hauhinco Maschinenfabrik G Hausherr Jochums GmbH and Co KG
Priority to DK91107357.5T priority Critical patent/DK0512138T3/en
Priority to DE59102642T priority patent/DE59102642D1/en
Priority to EP91107357A priority patent/EP0512138B1/en
Priority to AT91107357T priority patent/ATE110443T1/en
Priority to PL91290702A priority patent/PL166202B1/en
Priority to SU914895670A priority patent/RU2013660C1/en
Priority to US07/717,220 priority patent/US5131818A/en
Priority to JP3145904A priority patent/JPH0599120A/en
Priority to ZA915153A priority patent/ZA915153B/en
Priority to CN91105004A priority patent/CN1025064C/en
Publication of EP0512138A1 publication Critical patent/EP0512138A1/en
Application granted granted Critical
Publication of EP0512138B1 publication Critical patent/EP0512138B1/en
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
    • 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
    • F04B53/08—Cooling; Heating; Preventing freezing
    • 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
    • F04B53/008—Spacing or clearance between cylinder and piston
    • 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
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F04B53/162—Adaptations of cylinders
    • F04B53/166—Cylinder liners
    • 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
    • F05C2225/04—PTFE [PolyTetraFluorEthylene]
    • 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
    • F05C2225/08—Thermoplastics
    • 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
    • F05C2253/00—Other material characteristics; Treatment of material
    • F05C2253/16—Fibres
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S417/00—Pumps
    • Y10S417/01—Materials digest

Definitions

  • the invention relates to a high-pressure water pump which has at least one cylinder, a cylinder liner, a cylinder head, a metallic piston guided in the cylinder liner and a piston guide shoe, and an eccentric shaft housing, a driven eccentric shaft and mounted in the eccentric shaft housing, and pressure-controlled suction and delivery valves with valve closure pieces , wherein there are functional contacts between the eccentric shaft and the piston guide shoe and between the piston guide shoe and the piston, a cylinder space being formed by the piston, the cylinder liner and the cylinder head, an eccentric shaft space being enclosed by the eccentric shaft housing, water being in a suction stroke with the piston is sucked from the eccentric shaft space under low pressure into the cylinder space and is conveyed in a delivery stroke from the cylinder space under high pressure, and a gap space e. between the piston and the cylinder liner is set up.
  • the water to be pumped is taken from a low-pressure water reservoir and fed to the eccentric shaft space via a suitable flange.
  • Low pressure means a water pressure of approx. 10 bar or less.
  • the water is drawn from the eccentric shaft housing into the cylinder chamber via at least one suction valve during the suction stroke.
  • the intake valve opens when the water pressure in the cylinder chamber is lower than the water pressure in the eccentric shaft chamber by a certain low pressure threshold. If the pressure difference is less than the low pressure threshold or of the opposite sign, so the suction valve is closed.
  • High pressure means a water pressure of at least 200 bar up to 400 bar.
  • the outlet valve opens at a generally selectable high pressure threshold value of the water pressure, which corresponds to the desired minimum high pressure level.
  • the outlet valve is closed below this high pressure threshold. If the high pressure threshold value is exceeded during the delivery stroke, the outlet valve allows the water to be delivered to flow under high pressure.
  • the kinematics of the piston movement has a so-called top dead center and a so-called bottom dead center. The distance between these points is the hub.
  • the piston is pressed towards bottom dead center by spring pressure.
  • the stroke movements are brought about by the driven eccentric shaft via the functional contacts, the piston being pressed over the piston guide shoe in the direction of the top dead center or a movement of the piston in the direction of the bottom dead center is permitted due to the spring pressure.
  • the piston can be guided over its entire length in the cylinder liner at bottom dead center. However, a part of the piston facing the eccentric shaft can protrude from the cylinder liner at bottom dead center. If the piston and cylinder liner are of equal length, the piston is guided in the cylinder liner at a bottom dead center over a length which is approximately the result of the difference between the length of the cylinder liner and the stroke.
  • the piston and cylinder liner are dimensioned with regard to their lengths and taking the stroke into account so that disruptive tilting movements of the piston during operation are avoided.
  • High-pressure water pumps of the type described in the introduction have pistons and cylinder liners made of metallic materials. Between the piston and the cylinder liner, a gap is set up with a gap thickness such that the piston has a sliding fit in the cylinder liner in the permissible operating temperature range of the pump. A gap length is defined by the length over which the piston is guided in the cylinder liner.
  • the water to be pumped is also of functional importance for the operation of the pump. On the one hand, the high pressure water pump is continuously cooled by the water flow. On the other hand, the water to be pumped also has a lubricating function because it is loaded with a lubricant. Exposed sliding surfaces are continuously wetted with this lubricant during operation.
  • the lubricant content of the water to be pumped is 5% or less.
  • a minimum lubricant content is required for pistons and cylinder liners made of metallic materials. With a reduced lubricant content, the temperature of the cylinder liner and the piston rise due to increased friction and despite the cooling effect mentioned above. With increased friction, there is an increased removal of material on the piston and / or bushing, which increasingly impairs the function of the high-pressure water pump.
  • Practice has shown that known high-pressure water pumps become inoperable after a relatively short time without adding lubricant to the water for the reasons mentioned.
  • the lubricant additives used are harmful to the environment if the water to be pumped is not circulated. In most applications of high-pressure water pumps, it is impossible to guide the water in a closed circuit, but at least it is very complex and expensive. Lubricant additives are therefore not desirable for reasons of environmental protection, although previously technologically necessary.
  • the invention is based on the object of further developing a high-pressure water pump of the type described at the outset in such a way that reliable and long-term operation is ensured even without the addition of lubricants to the water to be pumped.
  • the invention teaches that for the purpose of using the high-pressure water pump to deliver practically lubricant-free water for the cylinder liner, a material from the group of high-strength thermoplastic materials based on polyether ether ketone is used, with the proviso that the gap between Piston and cylinder liner is formed from the cooling gap, through which a partial flow of the water to be pumped flows as a cooling medium during the delivery stroke, and with the further proviso that the cooling gap has a circumferential gap thickness that takes into account the pressure difference between the cylinder space and the eccentric shaft space during the delivery stroke, a minimum partial flow of Cooling medium ensures, which ensures that a temperature of the cylinder liner of 100 ° C is not exceeded during continuous operation of the high pressure water pump.
  • the procedure is preferably such that a temperature of 50 ° C. is not exceeded.
  • Practically lubricant-free water means that no lubricants are added to the water to be pumped for the purpose of lubricating the high-pressure water pump. Slight contamination of the water, for example by systems upstream of the high-pressure water pump, can often not be avoided. Depending on the application, however, very high levels of purity of the pumped water can be achieved if the water to be pumped is subjected to a purity monitor, for example.
  • the invention uses various findings. It is known from tribology that two metallic workpieces that slide against each other tend to cold weld when their surfaces are free of lubricants. Cold welding is avoided if one of the two workpieces is made of a non-metallic material. Most of the time, non-metallic materials meet due to their material properties, such as. B. hardness, elasticity and in particular thermal conductivity, not the requirements placed in mechanical engineering.
  • the combination of the material pair of metal / high-strength thermoplastic based on polyether ether ketone for the piston and cylinder liner enables reliable, lubricant-free continuous operation of a high-pressure water pump, specifically when a cooling gap is formed between the piston and cylinder liner, through which a partial flow of the water to be pumped is used as the cooling medium flows.
  • the advantages of the material pair are used in tribological terms, on the other hand, the comparatively low thermal conductivity of the non-metallic material, which makes the necessary dissipation of the frictional heat more difficult, is compensated for by the partial flow of water flowing through the cooling gap.
  • the cooling capacity which is given by the size of the partial flow of water flowing through the cooling gap, depends essentially on the pressure difference of the water pressure in the cylinder space and eccentric shaft space during the delivery stroke, as well as on the gap thickness and the gap length of the cooling gap.
  • the gap length is specified in the design. It is understood that the cooling gap is like this is set up that the cooling capacity exceeds the minimum value required for continuous operation of the material pair. This is determined by the maximum permissible temperature of 100 ° C of the cylinder liner and the gap thickness. In the high-pressure water pump according to the invention, however, the partial flow of water required for this is so low that the function of the pump as a high-pressure pump is not impaired.
  • a material from the group of high-strength thermoplastic materials based on polyether ether ketone without fillers can be used for the cylinder liner.
  • a material from the group of high-strength thermoplastic materials based on polyether ether ketone with carbon fibers as filler can be used for the cylinder liner.
  • Carbon fibers reinforce the material structurally and improve the mechanical properties. The thermal conductivity of the material is also increased by carbon fibers, so that the partial flow of water through the cooling gap can be reduced. Carbon fibers have a graphitic structure in the micro range. Graphite, although it is a solid, has, as it were, lubricating properties, which is a particular advantage of this embodiment.
  • a material from the group of high-strength thermoplastics based on polyether ether ketone is used for the cylinder liner, which contains PTFE as a filler.
  • PTFE is also a solid with lubricating properties.
  • Another embodiment of the invention is that for the cylinder liner, a material from the group of high-strength thermoplastic based on polyetheretherketone with carbon fibers and PTFE is used as filler.
  • a material from the group of high-strength thermoplastic materials based on polyether ether ketone is used for the cylinder liner, which has glass fibers or minerals as filler. It should be emphasized that in all of the embodiments, the materials from the group of high-strength thermoplastics based on polyether ether ketone have an isotropic appearance with regard to their macroscopic properties.
  • An advantageous embodiment of the invention is characterized in that the material from the group of high-strength thermoplastic materials based on polyether ether ketone has a hardness of at least 110 on the Rockwell scale "M".
  • a high hardness generally means a low removal rate and ensures good dimensional accuracy of the cylinder liner even during long-term operation. It is also advantageous if the material from the group of high-strength thermoplastics based on polyether ether ketone has a thermal conductivity of at least 0.80 W / mK.
  • a high thermal conductivity of the cylinder liner allows a lower partial flow of the cooling medium through the cooling gap without the maximum temperature of 100 ° C being exceeded in continuous operation.
  • the cylinder liner has a roughness depth of R z ⁇ 2.5 ⁇ m and R z > 1.5 ⁇ m.
  • the roughness depth R z is defined as the mean value of the individual roughness depth of five successive individual measurement sections.
  • a low surface roughness results in low friction and, consequently, a low development of frictional heat.
  • the roughness depth should not fall below a minimum value.
  • the underlying knowledge in this regard is that even pure water, albeit poor, has lubricating properties owns. If a minimum roughness depth is guaranteed, pockets are formed on the surface, in which water is more or less stationary, as it were, pillows, whereby a certain lubricating effect is promoted by the water.
  • a particularly simple and inexpensive to produce embodiment of a high pressure water pump according to the invention is characterized in that the cylinder liner is glued into the cylinder.
  • a high-pressure water pump according to the invention can have a piston guide shoe made from the material of the group of high-strength thermoplastics based on polyether ether ketone.
  • a material from the group of high-strength thermoplastics based on polyether ether ketone can also be used for the valve closure pieces.
  • the eccentric shaft is advantageously mounted in plain bearings with plain bearing shells.
  • the plain bearing shells can be made in one piece as bushings, but it is also within the scope of the invention if multi-part plain bearing shells are used.
  • One embodiment of the high-pressure water pump according to the invention is characterized in that a material from the group of high-strength thermoplastic materials based on polyether ether ketone is used for the slide bearing shells. It is understood that the material used for the piston guide shoe and / or the valve closure pieces and / or the slide bearing shells according to the above embodiments can have fillers of the type mentioned.
  • a high-pressure water pump according to the invention can have several cylinders arranged in series. However, the cylinders can also be arranged radially or axially in one plane. Other arrangements and the design with a single cylinder are of course also within the scope of the invention.
  • the high pressure water pump according to the invention can advantageously be used for various purposes. When used in underground coal mining, practically pure water can be used without the high-pressure water pump being damaged in continuous operation. The risk that environmentally hostile substances such. B. Lubricant additives previously required to water, percolate underground and get more or less directly into the groundwater is significantly reduced. When used as a pressure pump in high-pressure water jet cleaners, it is advantageous that the mostly prescribed dirt separators for the wastewater are less loaded. Only the dirt removed from the object to be cleaned accumulates on the dirt separators and not, as before, one considerable amount of the lubricant additive in the water.
  • the high-pressure water pump according to the invention can also be used in the scientific field, for example as a pressure and feed pump of a high-pressure liquid chromatography (HPLC) system. In such applications, even the slightest unwanted foreign substances in the water are extremely harmful.
  • HPLC high-pressure liquid chromatography
  • a high-pressure water pump, which can deliver lubricant-free water, is essential here.
  • the high-pressure water pump shown is a radial piston high-pressure water pump, with further pistons being arranged radially around the eccentric shaft, specifically in the same plane as the cylinder shown.
  • the other pistons protrude from the cross-sectional plane and are not indicated for the sake of clarity.
  • the cylinder 1 shows the cylinder 1 into which the cylinder liner 2 made of a material from the group of high-strength thermoplastic Polyetheretherketone-based plastics is glued in place.
  • the cylinder head 3 is placed on the cylinder 1.
  • the piston 4 is made of a metallic material.
  • the piston 4 is pressed by the compression spring 19 in the direction of bottom dead center.
  • the piston 4 is in functional contact with the piston guide shoe 5, which consists of a material from the group of high-strength thermoplastics based on polyether ether ketone.
  • the piston guide shoe 5 is in functional contact with the eccentric 20 of the eccentric shaft 6.
  • the eccentric shaft 6 is supported on both sides of the eccentric 20 in one-piece plain bearing shells 7, which consist of a material from the group of high-strength thermoplastic plastics based on polyether ether ketone.
  • the eccentric shaft 6 is located in the eccentric shaft housing 8, which encloses the eccentric shaft space 14.
  • the cylinder space 13 is enclosed by the piston 4, the cylinder liner 2 and the cylinder head 3.
  • a cooling gap 15 is set up, which has the gap thickness d and the gap length 1.
  • an intake valve 9 and a delivery valve 10 which operate under pressure control, are arranged.
  • the suction valve 9 has an annular closure piece 11 made of a material from the group of high-strength thermoplastic materials based on polyether ether ketone.
  • the delivery valve 10 has a closure piece 12, which also consists of a material from the group of high-strength thermoplastic materials based on polyether ether ketone.
  • the high-pressure water pump is driven by rotating drive of the eccentric shaft 6 at the connection 18. During the suction stroke of the piston 4, the piston 4 moves in the direction of bottom dead center, with the water to be pumped through the inflow opening 16, the eccentric shaft chamber 14 and the intake valve 9 flows into the cylinder space 13. The delivery valve 10 is closed.
  • the piston 4 moves in the direction of its top dead center, the water in the cylinder chamber 13 being compressed.
  • the intake valve 9 and the delivery valve 10 are initially closed.
  • the delivery valve 10 opens and the water to be delivered can flow out of the high-pressure outlet 17 of the high-pressure water pump under high pressure.
  • the piston 4 and the eccentric shaft 6 have cooling bores 21, as a result of which water can reach the sliding surfaces of the piston guide shoe 5 and the slide bearing shells 7 and cause cooling.

Abstract

A high-pressure water pump of the reciprocating piston type has its metal piston reciprocatable in a cylinder bushing composed of PEEK base high-strength thermoplastic synthetic resin and constructed so as to define a cooling clearance between the piston and the cylinder designed to prevent the temperature of the bushing on continuous operation from rising above 100 DEG C. The piston shoe and the slide bearing for the eccentric shaft should also be a PEEK based resin which can have a filler of carbon fibers, PTFE, glass fibers and/or mineral.

Description

Die Erfindung betrifft eine Hochdruckwasserpumpe, die zumindest einen Zylinder, eine Zylinderbuchse, einen Zylinderkopf, einen in der Zylinderbuchse geführten metallischen Kolben und einen Kolbenführungsschuh aufweist, sowie ein Exzenterwellengehäuse, eine angetriebene und im Exzenterwellengehäuse gelagerte Exzenterwelle, sowie druckgesteuerte Ansaug- und Förderventile mit Ventilverschlußstücken besitzt, wobei zwischen der Exzenterwelle und dem Kolbenführungsschuh sowie zwischen dem Kolbenführungsschuh und dem Kolben Funktionskontakte bestehen, wobei von dem Kolben, der Zylinderbuchse und dem Zylinderkopf ein Zylinderraum gebildet wird, wobei von dem Exzenterwellengehäuse ein Exzenterwellenraum umschlossen wird, wobei mit dem Kolben Wasser in einem Ansaughub aus dem Exzenterwellenraum unter Niederdruck in den Zylinderraum angesaugt und in einem Förderhub aus dem Zylinderraum unter Hochdruck gefördert wird, und wobei zwischen dem Kolben und der Zylinderbuchse ein Spaltraum eingerichtet ist.The invention relates to a high-pressure water pump which has at least one cylinder, a cylinder liner, a cylinder head, a metallic piston guided in the cylinder liner and a piston guide shoe, and an eccentric shaft housing, a driven eccentric shaft and mounted in the eccentric shaft housing, and pressure-controlled suction and delivery valves with valve closure pieces , wherein there are functional contacts between the eccentric shaft and the piston guide shoe and between the piston guide shoe and the piston, a cylinder space being formed by the piston, the cylinder liner and the cylinder head, an eccentric shaft space being enclosed by the eccentric shaft housing, water being in a suction stroke with the piston is sucked from the eccentric shaft space under low pressure into the cylinder space and is conveyed in a delivery stroke from the cylinder space under high pressure, and a gap space e. between the piston and the cylinder liner is set up.

Das zu fördernde Wasser wird einem Niederdruck-Wasserreservoir entnommen und dem Exzenterwellenraum über einen geeigneten Flansch zugeführt. Niederdruck meint einen Wasserdruck von ca. 10 Bar oder weniger. Das Wasser wird aus dem Exzenterwellengehäuse über zumindest ein Ansaugventil beim Ansaughub in den Zylinderraum angesaugt. Das Ansaugventil öffnet, wenn der Wasserdruck im Zylinderraum um einen bestimmten Niederdruckschwellenwert niedriger als der Wasserdruck im Exzenterwellenraum ist. Ist die Druckdifferenz kleiner als der Niederdruckschwellenwert oder von umgekehrtem Vorzeichen, so ist das Ansaugventil geschlossen. Während des Förderhubs wird das Wasser im Zylinderraum auf Hochdruck komprimiert. Hochdruck meint einen Wasserdruck von mindestens 200 Bar bis zu 400 Bar. Das Auslaßventil öffnet bei einem in der Regel wählbaren Hochdruckschwellenwert des Wasserdrucks, welcher dem gewünschten Mindesthochdruckniveau entspricht. Unterhalb dieses Hochdruckschwellenwertes ist das Auslaßventil geschlossen. Beim Überschreiten des Hochdruckschwellenwertes während des Förderhubs läßt das Auslaßventil das zu fördernde Wasser unter Hochdruck entströmen. Die Kinematik der Kolbenbewegung weist einen sogenannten oberen Totpunkt und einen sogenannten unteren Totpunkt auf. Die Wegstrecke zwischen diesen Punkten ist der Hub. Durch Federdruck wird der Kolben in Richtung des unteren Totpunktes gedrückt. Die Hubbewegungen werden durch die angetriebene Exzenterwelle über die Funktionskontakte bewirkt, wobei der Kolben über den Kolbenführungsschuh in Richtung des oberen Totpunktes gedrückt wird bzw. eine Bewegung des Kolbens in Richtung des unteren Totpunktes aufgrund des Federdrucks zugelassen wird. Der Kolben kann im unteren Totpunkt über seine ganze Länge in der Zylinderbuchse geführt sein. Es kann aber auch ein der Exzenterwelle zugewandter Teil des Kolbens im unteren Totpunkt aus der Zylinderbuchse herausragen. Sind Kolben und Zylinderbuchse gleich lang, so wird der Kolben im unteren Totpunkt in der Zylinderbuchse auf einer Länge geführt, welche sich in etwa aus der Differenz der Länge der Zylinderbuchse und des Hubs ergibt. Kolben und Zylinderbuchse sind hinsichtlich ihrer Längen und unter Berücksichtigung des Hubs so dimensioniert, daß störende Kippbewegungen des Kolbens im Betrieb vermieden werden.The water to be pumped is taken from a low-pressure water reservoir and fed to the eccentric shaft space via a suitable flange. Low pressure means a water pressure of approx. 10 bar or less. The water is drawn from the eccentric shaft housing into the cylinder chamber via at least one suction valve during the suction stroke. The intake valve opens when the water pressure in the cylinder chamber is lower than the water pressure in the eccentric shaft chamber by a certain low pressure threshold. If the pressure difference is less than the low pressure threshold or of the opposite sign, so the suction valve is closed. During the delivery stroke, the water in the cylinder chamber is compressed to high pressure. High pressure means a water pressure of at least 200 bar up to 400 bar. The outlet valve opens at a generally selectable high pressure threshold value of the water pressure, which corresponds to the desired minimum high pressure level. The outlet valve is closed below this high pressure threshold. If the high pressure threshold value is exceeded during the delivery stroke, the outlet valve allows the water to be delivered to flow under high pressure. The kinematics of the piston movement has a so-called top dead center and a so-called bottom dead center. The distance between these points is the hub. The piston is pressed towards bottom dead center by spring pressure. The stroke movements are brought about by the driven eccentric shaft via the functional contacts, the piston being pressed over the piston guide shoe in the direction of the top dead center or a movement of the piston in the direction of the bottom dead center is permitted due to the spring pressure. The piston can be guided over its entire length in the cylinder liner at bottom dead center. However, a part of the piston facing the eccentric shaft can protrude from the cylinder liner at bottom dead center. If the piston and cylinder liner are of equal length, the piston is guided in the cylinder liner at a bottom dead center over a length which is approximately the result of the difference between the length of the cylinder liner and the stroke. The piston and cylinder liner are dimensioned with regard to their lengths and taking the stroke into account so that disruptive tilting movements of the piston during operation are avoided.

Aus der Praxis bekannte Hochdruckwasserpumpen der eingangs beschriebenen Art weisen Kolben und Zylinderbuchsen aus metallischen Werkstoffen auf. Zwischen Kolben und Zylinderbuchse ist ein Spaltraum mit einer solchen Spaltdicke eingerichtet, daß sich im zulässigen Betriebstemperaturbereich der Pumpe ein Gleitsitz des Kolbens in der Zylinderbuchse ergibt. Durch die Länge, auf der der Kolben in der Zylinderbuchse geführt ist, ist eine Spaltlänge definiert. Bei den insoweit bekannten Hochdruckwasserpumpen hat das zu fördernde Wasser auch funktionelle Bedeutung für den Betrieb der Pumpe. Einerseits wird die Hochdruckwasserpumpe kontinuierlich gekühlt durch den Wasserdurchfluß. Andererseits trägt das zu fördernde Wasser auch eine Schmierfunktion, da es mit einem Schmiermittel beladen ist. Freiliegende Gleitflächen werden im Betrieb mit diesem Schmiermittel kontinuierlich benetzt. Der Schmiermittelgehalt des zu fördernden Wassers beträgt 5 % oder weniger. Die Praxis hat gezeigt, daß bei Kolben und Zylinderbuchsen aus metallischen Werkstoffen ein Mindestschmiermittelgehalt erforderlich ist. Mit reduziertem Schmiermittelgehalt steigt die Temperatur der Zylinderbuchse und des Kolbens aufgrund erhöhter Reibung und trotz des oben genannten Kühleffektes. Mit erhöhter Reibung findet ein verstärkter Abtrag von Material an Kolben und/oder Buchse statt, der die Funktion der Hochdruckwasserpumpe zunehmend beeinträchtigt. Die Praxis hat gezeigt, daß bekannte Hochdruckwasserpumpen ohne Zusatz von Schmiermittel zum Wasser nach relativ kurzer Zeit aus genannten Gründen funktionsunfähig werden. Die verwendeten Schmiermittelzusätze sind jedoch schädlich für die Umwelt, wenn das zu fördernde Wasser nicht in einem geschlossenen Kreislauf geführt wird. Bei den meisten Anwendungen von Hochdruckwasserpumpen ist die Führung des Wassers in einem geschlossenen Kreislauf unmöglich, zumindest aber sehr aufwendig und teuer. Schmiermittelzusätze sind daher aus Umweltschutzgründen nicht erwünscht, obwohl technologisch bislang erforderlich.High-pressure water pumps of the type described in the introduction have pistons and cylinder liners made of metallic materials. Between the piston and the cylinder liner, a gap is set up with a gap thickness such that the piston has a sliding fit in the cylinder liner in the permissible operating temperature range of the pump. A gap length is defined by the length over which the piston is guided in the cylinder liner. In the high-pressure water pumps known to date, the water to be pumped is also of functional importance for the operation of the pump. On the one hand, the high pressure water pump is continuously cooled by the water flow. On the other hand, the water to be pumped also has a lubricating function because it is loaded with a lubricant. Exposed sliding surfaces are continuously wetted with this lubricant during operation. The lubricant content of the water to be pumped is 5% or less. Practice has shown that a minimum lubricant content is required for pistons and cylinder liners made of metallic materials. With a reduced lubricant content, the temperature of the cylinder liner and the piston rise due to increased friction and despite the cooling effect mentioned above. With increased friction, there is an increased removal of material on the piston and / or bushing, which increasingly impairs the function of the high-pressure water pump. Practice has shown that known high-pressure water pumps become inoperable after a relatively short time without adding lubricant to the water for the reasons mentioned. However, the lubricant additives used are harmful to the environment if the water to be pumped is not circulated. In most applications of high-pressure water pumps, it is impossible to guide the water in a closed circuit, but at least it is very complex and expensive. Lubricant additives are therefore not desirable for reasons of environmental protection, although previously technologically necessary.

Der Erfindung liegt die Aufgabe zugrunde, eine Hochdruckwasserpumpe der eingangs beschriebenen Art so weiter auszubilden, daß ein zuverlässiger und lang dauernder Betrieb auch ohne Schmiermittelzusätze zum zu fördernden Wasser gewährleistet wird.The invention is based on the object of further developing a high-pressure water pump of the type described at the outset in such a way that reliable and long-term operation is ensured even without the addition of lubricants to the water to be pumped.

Zur Lösung dieser Aufgabe lehrt die Erfindung, daß zum Zwecke des Einsatzes der Hochdruckwasserpumpe zum Fördern von praktisch schmiermittelfreiem Wasser für die Zylinderbuchse ein Werkstoff aus der Gruppe der hochfesten thermoplastischen Kunststoffe auf Polyetheretherketon-Basis verwendet ist, und zwar mit der Maßgabe, daß der Spaltraum zwischen Kolben und Zylinderbuchse aus Kühlspaltraum ausgebildet ist, durch den beim Förderhub ein Teilmengenstrom des zu fördernden Wassers als Kühlmedium strömt, und mit der weiteren Maßgabe, daß der Kühlspaltraum umlaufend eine Spaltdicke aufweist, die unter Berücksichtigung der Druckdifferenz zwischen Zylinderraum und Exzenterwellenraum beim Förderhub einen Mindestteilmengenstrom des Kühlmediums gewährleistet, welcher sicherstellt, daß im Dauerbetrieb der Hochdruckwasserpumpe eine Temperatur der Zylinderbuchse von 100° C nicht überschritten wird. Vorzugsweise wird so gearbeitet, daß eine Temperatur von 50° C nicht überschritten wird. - Praktisch schmiermittelfreies Wasser bedeutet, daß dem zu fördernden Wasser keine Schmiermittel zum Zwecke der Schmierung der Hochdruckwasserpumpe zugefügt werden. Geringfügige Verschmutzungen des Wassers, beispielsweise durch der Hochdruckwasserpumpe vorgeschaltete Anlagen, sind jedoch oft nicht zu vermeiden. Je nach Anwendung lassen sich aber sehr hohe Reinheitsgrade des geförderten Wassers erreichen, wenn das zu fördernde Wasser beispielsweise einer Reinheitsüberwachung unterworfen ist.To achieve this object, the invention teaches that for the purpose of using the high-pressure water pump to deliver practically lubricant-free water for the cylinder liner, a material from the group of high-strength thermoplastic materials based on polyether ether ketone is used, with the proviso that the gap between Piston and cylinder liner is formed from the cooling gap, through which a partial flow of the water to be pumped flows as a cooling medium during the delivery stroke, and with the further proviso that the cooling gap has a circumferential gap thickness that takes into account the pressure difference between the cylinder space and the eccentric shaft space during the delivery stroke, a minimum partial flow of Cooling medium ensures, which ensures that a temperature of the cylinder liner of 100 ° C is not exceeded during continuous operation of the high pressure water pump. The procedure is preferably such that a temperature of 50 ° C. is not exceeded. - Practically lubricant-free water means that no lubricants are added to the water to be pumped for the purpose of lubricating the high-pressure water pump. Slight contamination of the water, for example by systems upstream of the high-pressure water pump, can often not be avoided. Depending on the application, however, very high levels of purity of the pumped water can be achieved if the water to be pumped is subjected to a purity monitor, for example.

Die Erfindung nutzt verschiedene Erkenntnisse. Aus der Tribologie ist bekannt, daß zwei metallische Werkstücke, die gegeneinander gleiten, in der Regel zum Kaltverschweißen neigen, wenn ihre Oberflächen frei von Schmiermittel sind. Ein Kaltverschweißen wird vermieden, wenn eines der beiden Werkstücke aus einem nichtmetallischen Werkstoff besteht. Meist erfüllen nichtmetallische Werkstoffe aber aufgrund ihrer Materialeigenschaften, wie z. B. Härte, Elastizität und insbesondere Wärmeleitfähigkeit, nicht die im Maschinenbau gestellten Anforderungen. Überraschenderweise wird mit der Kombination des Materialpaars Metall/hochfester thermoplastischer Kunststoff auf Polyetheretherketon-Basis für Kolben und Zylinderbuchse ein zuverlässiger schmiermittelfreier Dauerbetrieb einer Hochdruckwasserpumpe ermöglicht, und zwar wenn ein Kühlspaltraum zwischen Kolben und Zylinderbuchse ausgebildet ist, durch den ein Teilmengenstrom des zu fördernden Wassers als Kühlmedium strömt. Hierbei werden einerseits die Vorteile des Materialpaars in tribologischer Hinsicht genutzt, andererseits wird die vergleichsweise geringe Wärmeleitfähigkeit des nichtmetallischen Werkstoffes, welche die notwendige Ableitung der Reibungswärme erschwert, durch den den Kühlspaltraum durchströmenden Teilmengenstrom Wasser ausgeglichen. Ferner erfüllen Werkstoffe aus der Gruppe der hochfesten thermoplastischen Kunststoffe auf Polyetheretherketon-Basis die Anforderungen hinsichtlich mechanischer Materialeigenschaften. Die Kühlleistung, welche durch die Größe des den Kühlspaltraum durchströmenden Teilmengenstroms Wasser gegeben ist, richtet sich im wesentlichen nach der Druckdifferenz des Wasserdrucks im Zylinderraum und Exzenterwellenraum beim Förderhub, sowie nach der Spaltdicke und der Spaltlänge des Kühlspaltraums. Die Spaltlänge ist konstruktiv vorgegeben. Es versteht sich, daß der Kühlspaltraum so eingerichtet ist, daß die Kühlleistung den für Dauerbetrieb des Materialpaars erforderlichen Mindestwert überschreitet. Dieser wird bestimmt durch die maximal zulässige Temperatur von 100° C der Zylinderbuchse und über die Spaltdicke eingestellt. Bei der erfindungsgemäßen Hochdruckwasserpumpe ist der hierfür erforderliche Teilmengenstrom Wasser jedoch so gering, daß die Funktion der Pumpe als Hochdruckpumpe nicht beeinträchtigt wird.The invention uses various findings. It is known from tribology that two metallic workpieces that slide against each other tend to cold weld when their surfaces are free of lubricants. Cold welding is avoided if one of the two workpieces is made of a non-metallic material. Most of the time, non-metallic materials meet due to their material properties, such as. B. hardness, elasticity and in particular thermal conductivity, not the requirements placed in mechanical engineering. Surprisingly, the combination of the material pair of metal / high-strength thermoplastic based on polyether ether ketone for the piston and cylinder liner enables reliable, lubricant-free continuous operation of a high-pressure water pump, specifically when a cooling gap is formed between the piston and cylinder liner, through which a partial flow of the water to be pumped is used as the cooling medium flows. On the one hand, the advantages of the material pair are used in tribological terms, on the other hand, the comparatively low thermal conductivity of the non-metallic material, which makes the necessary dissipation of the frictional heat more difficult, is compensated for by the partial flow of water flowing through the cooling gap. Furthermore, materials from the group of high-strength thermoplastics based on polyether ether ketone meet the requirements with regard to mechanical material properties. The cooling capacity, which is given by the size of the partial flow of water flowing through the cooling gap, depends essentially on the pressure difference of the water pressure in the cylinder space and eccentric shaft space during the delivery stroke, as well as on the gap thickness and the gap length of the cooling gap. The gap length is specified in the design. It is understood that the cooling gap is like this is set up that the cooling capacity exceeds the minimum value required for continuous operation of the material pair. This is determined by the maximum permissible temperature of 100 ° C of the cylinder liner and the gap thickness. In the high-pressure water pump according to the invention, however, the partial flow of water required for this is so low that the function of the pump as a high-pressure pump is not impaired.

Für die Zylinderbuchse kann ein Werkstoff aus der Gruppe der hochfesten thermoplastischen Kunststoffe auf Polyetheretherketon-Basis ohne Füllstoffe verwendet sein. In einer vorteilhaften Ausführungsform kann für die Zylinderbuchse ein Werkstoff aus der Gruppe der hochfesten thermoplastischen Kunststoffe auf Polyetheretherketon-Basis mit Kohlenstoffasern als Füllstoff verwendet sein. Kohlenstoffasern verstärken den Werkstoff in struktureller Hinsicht und verbessern die mechanischen Eigenschaften. Auch die Wärmeleitfähigkeit des Werkstoffes wird durch Kohlenstoffasern erhöht, so daß der Teilmengenstrom Wasser durch den Kühlspaltraum reduziert sein kann. Kohlenstoffasern weisen im Mikrobereich eine graphitische Struktur auf. Graphit hat, obwohl es ein Feststoff ist, gleichsam schmierende Eigenschaften, worin ein besonderer Vorteil dieser Ausführungsform zu sehen ist. In einer weiteren Ausführungsform ist für die Zylinderbuchse ein Werkstoff aus der Gruppe der hochfesten thermoplastischen Kunststoffe auf Polyetherehterketon-Basis verwendet, welcher PTFE als Füllstoff enthält. PTFE ist bekanntlich ebenfalls ein Feststoff mit gleichsam schmierenden Eigenschaften. Eine weitere Ausführungsform der Erfindung besteht darin, daß für die Zylinderbuchse ein Werkstoff aus der Gruppe der hochfesten thermoplastischen Kunststoffe auf Polyetheretherketon-Basis mit Kohlenstoffasern und PTFE als Füllstoff verwendet ist. In zwei anderen Ausführungsformen ist für die Zylinderbuchse ein Werkstoff aus der Gruppe der hochfesten thermoplastischen Kunststoffe auf Polyetheretherketon-Basis verwendet, der Glasfasern oder Mineralien als Füllstoff aufweist. Es ist zu betonen, daß bei allen Ausführungsformen die Werkstoffe aus der Gruppe der hochfesten thermoplastischen Kunststoffe auf Polyetheretherketon-Basis hinsichtlich ihrer makroskopischen Eigenschaften ein isotropisches Erscheinungsbild haben.A material from the group of high-strength thermoplastic materials based on polyether ether ketone without fillers can be used for the cylinder liner. In an advantageous embodiment, a material from the group of high-strength thermoplastic materials based on polyether ether ketone with carbon fibers as filler can be used for the cylinder liner. Carbon fibers reinforce the material structurally and improve the mechanical properties. The thermal conductivity of the material is also increased by carbon fibers, so that the partial flow of water through the cooling gap can be reduced. Carbon fibers have a graphitic structure in the micro range. Graphite, although it is a solid, has, as it were, lubricating properties, which is a particular advantage of this embodiment. In a further embodiment, a material from the group of high-strength thermoplastics based on polyether ether ketone is used for the cylinder liner, which contains PTFE as a filler. As is well known, PTFE is also a solid with lubricating properties. Another embodiment of the invention is that for the cylinder liner, a material from the group of high-strength thermoplastic based on polyetheretherketone with carbon fibers and PTFE is used as filler. In two other embodiments, a material from the group of high-strength thermoplastic materials based on polyether ether ketone is used for the cylinder liner, which has glass fibers or minerals as filler. It should be emphasized that in all of the embodiments, the materials from the group of high-strength thermoplastics based on polyether ether ketone have an isotropic appearance with regard to their macroscopic properties.

Eine vorteilhafte Ausführung der Erfindung ist dadurch charakterisiert, daß der Werkstoff aus der Gruppe der hochfesten thermoplastischen Kunststoffe auf Polyetheretherketon-Basis eine Härte von mindestens 110 auf der Rockwell Skala "M" aufweist. Eine hohe Härte bedingt in der Regel eine niedrige Abtragrate und gewährleistet eine gute Maßhaltigkeit der Zylinderbuchse auch bei langandauerndem Betrieb. Es ist weiterhin vorteilhaft, wenn der Werkstoff aus der Gruppe der hochfesten thermoplastischen Kunststoffe auf Polyetheretherketon-Basis eine Wärmeleitfähigkeit von mindestens 0,80 W/mK aufweist. Eine hohe Wärmeleitfähigkeit der Zylinderbuchse erlaubt einen geringeren Teilmengenstrom des Kühlmediums durch den Kühlspaltraum ohne daß die Maximaltemperatur von 100° C im Dauerbetrieb überschritten wird. Es ist von Vorteil, wenn die Zylinderbuchse eine Rauhtiefe von Rz < 2,5 µm und Rz > 1,5 µm aufweist. Die Rauhtiefe Rz ist definiert als der Mittelwert der Einzelrauhtiefe fünf aufeinanderfolgender Einzelmeßstrecken. Eine geringe Rauhtiefe hat eine geringe Reibung und demzufolge eine geringe Entwicklung von Reibungswärme zur Folge. Ein Mindestwert für die Rauhtiefe sollte jedoch nicht unterschritten werden. Die diesbezüglich zugrundeliegende Erkenntnis ist, daß selbst reines Wasser, wenn auch schlechte, Schmiereigenschaften besitzt. Wird eine Mindestrauhtiefe gewährleistet, sind gleichsam Taschen an der Oberfläche gebildet, in welchen sich Wasser mehr oder weniger stationär gleichsam Kissen befindet, wodurch ein gewisser Schmiereffekt durch das Wasser gefördert wird.An advantageous embodiment of the invention is characterized in that the material from the group of high-strength thermoplastic materials based on polyether ether ketone has a hardness of at least 110 on the Rockwell scale "M". A high hardness generally means a low removal rate and ensures good dimensional accuracy of the cylinder liner even during long-term operation. It is also advantageous if the material from the group of high-strength thermoplastics based on polyether ether ketone has a thermal conductivity of at least 0.80 W / mK. A high thermal conductivity of the cylinder liner allows a lower partial flow of the cooling medium through the cooling gap without the maximum temperature of 100 ° C being exceeded in continuous operation. It is advantageous if the cylinder liner has a roughness depth of R z <2.5 µm and R z > 1.5 µm. The roughness depth R z is defined as the mean value of the individual roughness depth of five successive individual measurement sections. A low surface roughness results in low friction and, consequently, a low development of frictional heat. However, the roughness depth should not fall below a minimum value. The underlying knowledge in this regard is that even pure water, albeit poor, has lubricating properties owns. If a minimum roughness depth is guaranteed, pockets are formed on the surface, in which water is more or less stationary, as it were, pillows, whereby a certain lubricating effect is promoted by the water.

Eine besonders einfache und kostengünstig herzustellende Ausführungsform einer erfindungsgemäßen Hochdruckwasserpumpe ist dadurch charakterisiert, daß die Zylinderbuchse in dem Zylinder eingeklebt ist.A particularly simple and inexpensive to produce embodiment of a high pressure water pump according to the invention is characterized in that the cylinder liner is glued into the cylinder.

Optimale Betriebsverhältnisse und eine besonders lange Lebensdauer der erfindungsgemäßen Hochdruckwasserpumpe werden gewährleistet, wenn der Kühlspaltraum bei Raumtemperatur ein Verhältnis von Spaltdicke zu Spaltlänge im Bereich von 0,0005 bis 0,0007 aufweist. Weiterhin vorteilhaft ist es, wenn der den Kühlspaltraum beim Förderhub als Kühlmedium durchströmende Teilmengenstrom des zu fördernden Wassers im Bereich von 0,0002 Vol.% bis 0,0003 Vol.% des angesaugten Gesamtmengenstromes liegt. Eine erfindungsgemäße Hochdruckwasserpumpe kann einen Kolbenführungsschuh aus dem Werkstoff der Gruppe der hochfesten thermoplastischen Kunststoffe auf Polyetheretherketon-Basis aufweisen. Auch für die Ventilverschlußstücke kann ein Werkstoff aus der Gruppe der hochfesten thermoplastischen Kunststoffe auf Polyetheretherketon-Basis verwendet sein. Aufgrund der hohen Druckbelastungen und der hohen Umdrehungszahlen der Exzenterwelle ist die Exzenterwelle vorteilhaft in Gleitlagern mit Gleitlagerschalen gelagert. Die Gleitlagerschalen können einteilig als Buchsen ausgeführt sein, jedoch liegt es ebenso im Rahmen der Erfindung wenn mehrteilige Gleitlagerschalen eingesetzt sind. Eine Ausführungsform der erfindungsgemäßen Hochdruckwasserpumpe zeichnet sich dadurch aus, daß für die Gleitlagerschalen ein Werkstoff aus der Gruppe der hochfesten thermoplastischen Kunststoffe auf Polyetheretherketon-Basis verwendet ist. Es versteht sich, daß der Werkstoff, der gemäß vorstehender Ausführungsformen für den Kolbenführungsschuh und/oder die Ventilverschlußstücke und/oder die Gleitlagerschalen verwendet ist, Füllstoffe der genannten Art aufweisen kann.Optimal operating conditions and a particularly long service life of the high-pressure water pump according to the invention are ensured if the cooling gap space at room temperature has a ratio of gap thickness to gap length in the range from 0.0005 to 0.0007. It is also advantageous if the partial flow of the water to be pumped flowing through the cooling gap during the delivery stroke as the cooling medium is in the range from 0.0002% by volume to 0.0003% by volume of the total flow sucked in. A high-pressure water pump according to the invention can have a piston guide shoe made from the material of the group of high-strength thermoplastics based on polyether ether ketone. A material from the group of high-strength thermoplastics based on polyether ether ketone can also be used for the valve closure pieces. Due to the high pressure loads and the high number of revolutions of the eccentric shaft, the eccentric shaft is advantageously mounted in plain bearings with plain bearing shells. The plain bearing shells can be made in one piece as bushings, but it is also within the scope of the invention if multi-part plain bearing shells are used. One embodiment of the high-pressure water pump according to the invention is characterized in that a material from the group of high-strength thermoplastic materials based on polyether ether ketone is used for the slide bearing shells. It is understood that the material used for the piston guide shoe and / or the valve closure pieces and / or the slide bearing shells according to the above embodiments can have fillers of the type mentioned.

Eine erfindungsgemäße Hochdruckwasserpumpe kann mehrere Zylinder in Reihe angeordnet aufweisen. Die Zylinder können aber auch in einer Ebene radial oder axial angeordnet sein. Andere Anordnungen sowie die Ausführung mit einem einzelnen Zylinder liegen selbstverständlich ebenso im Rahmen der Erfindung.A high-pressure water pump according to the invention can have several cylinders arranged in series. However, the cylinders can also be arranged radially or axially in one plane. Other arrangements and the design with a single cylinder are of course also within the scope of the invention.

Die erfindungsgemäße Hochdruckwasserpumpe kann für verschiedene Verwendungszwecke vorteilhaft eingesetzt werden. Bei Verwendung im Untertagekohlebergbau kann praktisch reines Wasser zum Einsatz kommen, ohne daß die Hochdruckwasserpumpe im Dauerbetrieb geschädigt wird. Die Gefahr, daß umweltfeindliche Substanzen, wie z. B. bislang erforderliche Schmiermittelzusätze zum Wasser, untertage versickern und mehr oder weniger direkt in das Grundwasser gelangen wird erheblich verringert. Bei der Verwendung als Druckpumpe in Hochdruckwasserstrahlreinigern ist es von Vorteil, daß die zumeist vorgeschriebenen Schmutzabscheider für das Abwasser geringer belastet werden. An den Schmutzabscheidern fällt nur der von dem zu reinigenden Gegenstand abgetragene Schmutz an und nicht, wie bisher, eine erhebliche Menge des Schmiermittelzusatzes im Wasser. Die erfindungsgemäße Hochdruckwasserpumpe kann auch im wissenschaftlichen Bereich, beispielsweise als Druck- und Förderpumpe einer High-Pressure-Liquid-Chromatography (HPLC)-Anlage verwendet werden. Bei solchen Anwendungen sind selbst geringste unerwünschte Fremdstoffe im Wasser außerordentlich schädlich. Eine Hochdruckwasserpumpe, welche schmiermittelfreies Wasser fördern kann, ist hier unabdingbar. Selbstverständlich gibt es eine Vielzahl weiterer Verwendungsmöglichkeiten, die ebenfalls im Rahmen der Erfindung liegen.The high pressure water pump according to the invention can advantageously be used for various purposes. When used in underground coal mining, practically pure water can be used without the high-pressure water pump being damaged in continuous operation. The risk that environmentally hostile substances such. B. Lubricant additives previously required to water, percolate underground and get more or less directly into the groundwater is significantly reduced. When used as a pressure pump in high-pressure water jet cleaners, it is advantageous that the mostly prescribed dirt separators for the wastewater are less loaded. Only the dirt removed from the object to be cleaned accumulates on the dirt separators and not, as before, one considerable amount of the lubricant additive in the water. The high-pressure water pump according to the invention can also be used in the scientific field, for example as a pressure and feed pump of a high-pressure liquid chromatography (HPLC) system. In such applications, even the slightest unwanted foreign substances in the water are extremely harmful. A high-pressure water pump, which can deliver lubricant-free water, is essential here. Of course there are a variety of other possible uses, which are also within the scope of the invention.

Im folgenden wird die Erfindung anhand einer lediglich ein Ausführungsbeispiel darstellenden Zeichnung ausführlicher erläutert. Es zeigen in schematischer Darstellung

Fig. 1
einen Querschnitt durch eine erfindungsgemäße Hochdruckwasserpumpe,
Fig. 2
einen vergrößerten Ausschnitt aus dem Gegenstand der Fig. 1.
In the following, the invention will be explained in more detail with reference to a drawing showing only one embodiment. They show a schematic representation
Fig. 1
a cross section through a high pressure water pump according to the invention,
Fig. 2
2 shows an enlarged detail from the subject of FIG. 1.

Bei der dargestellten Hochdruckwasserpumpe handelt es sich um eine Radialkolbenhochdruckwasserpumpe, wobei weitere Kolben radial um die Exzenterwelle angeordnet sind und zwar in derselben Ebene wie der abgebildete Zylinder. Die weiteren Kolben ragen aus der Querschnittsebene heraus und sind der Übersichtlichkeit halber nicht angedeutet.The high-pressure water pump shown is a radial piston high-pressure water pump, with further pistons being arranged radially around the eccentric shaft, specifically in the same plane as the cylinder shown. The other pistons protrude from the cross-sectional plane and are not indicated for the sake of clarity.

In der Fig. 1 erkennt man den Zylinder 1, in den die Zylinderbuchse 2 aus einem Werkstoff aus der Gruppe der hochfesten thermoplastischen Kunststoffe auf Polyetheretherketon-Basis eingeklebt ist. Auf den Zylinder 1 ist der Zylinderkopf 3 aufgesetzt. In der Zylinderbuchse 2 ist der Kolben 4 aus einem metallischen Werkstoff geführt. Der Kolben 4 wird durch die Druckfeder 19 in Richtung des unteren Totpunktes gedrückt. Der Kolben 4 steht in Funktionskontakt mit dem Kolbenführungsschuh 5, welcher aus einem Werkstoff aus der Gruppe der hochfesten thermoplastischen Kunststoffe auf Polyetheretherketon-Basis besteht. Der Kolbenführungsschuh 5 wiederum steht in Funktionskontakt mit dem Exzenter 20 der Exzenterwelle 6. Die Exzenterwelle 6 ist auf beiden Seiten des Exzenters 20 in einteiligen Gleitlagerschalen 7, welche aus einem Werkstoff aus der Gruppe der hochfesten thermoplastischen Kunststoffe auf Polyetheretherketon-Basis bestehen, gelagert. Die Exzenterwelle 6 befindet sich in dem Exzenterwellengehäuse 8, welches den Exzenterwellenraum 14 umschließt. Der Zylinderraum 13 wird von dem Kolben 4, der Zylinderbuchse 2 und dem Zylinderkopf 3 umschlossen. Zwischen dem Kolben 4 und der Zylinderbuchse 2 ist ein Kühlspaltraum 15 eingerichtet, welcher die Spaltdicke d und die Spaltlänge 1 aufweist. Im Bereich des Zylinderkopfes 3 sind ein Ansaugventil 9 und ein Förderventil 10, welche druckgesteuert arbeiten, angeordnet. Das Ansaugventil 9 weist ein ringförmiges Verschlußstück 11 aus einem Werkstoff aus der Gruppe der hochfesten thermoplastischen Kunststoffe auf Polyetheretherketon-Basis auf. Das Förderventil 10 weist ein Verschlußstück 12 auf, welches gleichfalls aus einem Werkstoff aus der Gruppe der hochfesten thermoplastischen Kunststoffe auf Polyetheretherketon-Basis besteht. Der Antrieb der Hochdruckwasserpumpe erfolgt durch drehenden Antrieb der Exzenterwelle 6 an dem Anschluß 18. Beim Ansaughub des Kolbens 4 bewegt sich der Kolben 4 in Richtung des unteren Totpunktes, wobei das zu fördernde Wasser durch die Einströmöffnung 16, den Exzenterwellenraum 14 und das Ansaugventil 9 in den Zylinderraum 13 einströmt. Das Förderventil 10 ist dabei geschlossen. Beim Förderhub des Kolbens 4 bewegt sich der Kolben 4 in Richtung seines oberen Totpunktes, wobei das Wasser in dem Zylinderraum 13 komprimiert wird. Hierbei sind zunächst das Ansaugventil 9 und das Förderventil 10 geschlossen. Sobald der Wasserdruck in dem Zylinderraum 13 einen Hochdruckschwellenwert überschreitet, öffnet das Förderventil 10 und das zu fördernde Wasser kann unter Hochdruck aus dem Hochdruckauslaß 17 der Hochdruckwasserpumpe entströmen. Der Kolben 4 sowie die Exzenterwelle 6 weisen Kühlbohrungen 21 auf, wodurch Wasser zu den Gleitflächen des Kolbenführungsschuhs 5 und der Gleitlagerschalen 7 gelangen kann und eine Kühlung bewirkt.1 shows the cylinder 1 into which the cylinder liner 2 made of a material from the group of high-strength thermoplastic Polyetheretherketone-based plastics is glued in place. The cylinder head 3 is placed on the cylinder 1. In the cylinder liner 2, the piston 4 is made of a metallic material. The piston 4 is pressed by the compression spring 19 in the direction of bottom dead center. The piston 4 is in functional contact with the piston guide shoe 5, which consists of a material from the group of high-strength thermoplastics based on polyether ether ketone. The piston guide shoe 5 is in functional contact with the eccentric 20 of the eccentric shaft 6. The eccentric shaft 6 is supported on both sides of the eccentric 20 in one-piece plain bearing shells 7, which consist of a material from the group of high-strength thermoplastic plastics based on polyether ether ketone. The eccentric shaft 6 is located in the eccentric shaft housing 8, which encloses the eccentric shaft space 14. The cylinder space 13 is enclosed by the piston 4, the cylinder liner 2 and the cylinder head 3. Between the piston 4 and the cylinder liner 2, a cooling gap 15 is set up, which has the gap thickness d and the gap length 1. In the area of the cylinder head 3, an intake valve 9 and a delivery valve 10, which operate under pressure control, are arranged. The suction valve 9 has an annular closure piece 11 made of a material from the group of high-strength thermoplastic materials based on polyether ether ketone. The delivery valve 10 has a closure piece 12, which also consists of a material from the group of high-strength thermoplastic materials based on polyether ether ketone. The high-pressure water pump is driven by rotating drive of the eccentric shaft 6 at the connection 18. During the suction stroke of the piston 4, the piston 4 moves in the direction of bottom dead center, with the water to be pumped through the inflow opening 16, the eccentric shaft chamber 14 and the intake valve 9 flows into the cylinder space 13. The delivery valve 10 is closed. During the delivery stroke of the piston 4, the piston 4 moves in the direction of its top dead center, the water in the cylinder chamber 13 being compressed. Here, the intake valve 9 and the delivery valve 10 are initially closed. As soon as the water pressure in the cylinder chamber 13 exceeds a high-pressure threshold value, the delivery valve 10 opens and the water to be delivered can flow out of the high-pressure outlet 17 of the high-pressure water pump under high pressure. The piston 4 and the eccentric shaft 6 have cooling bores 21, as a result of which water can reach the sliding surfaces of the piston guide shoe 5 and the slide bearing shells 7 and cause cooling.

Fig. 2 ist aus den obigen Darlegungen und den eingetragenen Bezugszeichen ohne weiteres verständlich und verdeutlicht die Verhältnisse im Bereich von Zylinder 1, Zylinderbuchse 2 und Zylinderkopf 3.2 is readily understandable from the above explanations and the registered reference numerals and illustrates the relationships in the area of cylinder 1, cylinder liner 2 and cylinder head 3.

Claims (22)

Hochdruckwasserpumpe, die zumindest einen Zylinder, eine Zylinderbuchse, einen Zylinderkopf, einen in der Zylinderbuchse geführten metallischen Kolben und einen Kolbenführungsschuh aufweist, sowie ein Exzenterwellengehäuse, eine angetriebene und im Exzenterwellengehäuse gelagerte Exzenterwelle sowie druckgesteuerte Ansaug- und Förderventile mit Ventilverschlußstücken besitzt,

wobei zwischen der Exzenterwelle und dem Kolbenführungsschuh sowie zwischen dem Kolbenführungsschuh und dem Kolben Funktionskontakte bestehen,

wobei von dem Kolben, der Zylinderbuchse und dem Zylinderkopf ein Zylinderraum gebildet wird,

wobei von dem Exzenterwellengehäuse ein Exzenterwellenraum umschlossen wird,

wobei mit dem Kolben Wasser in einem Ansaughub aus dem Exzenterwellenraum unter Niederdruck in den Zylinderraum angesaugt und in einem Förderhub aus dem Zylinderraum unter Hochdruck gefördert wird, und

wobei zwischen dem Kolben und der Zylinderbuchse ein Spaltraum eingerichtet ist,

dadurch gekennzeichnet,

daß zum Zwecke des Einsatzes der Hochdruckwasserpumpe zum Fördern von praktisch schmiermittelfreiem Wasser für die Zylinderbuchse (2) ein Werkstoff aus der Gruppe der hochfesten thermoplastischen Kunststoffe auf Polyetheretherketon-Basis verwendet ist, und zwar mit der Maßgabe,

   daß der Spaltraum zwischen Kolben (4) und Zylinderbuchse (2) als Kühlspaltraum (15) ausgebildet ist, durch den beim Förderhub ein Teilmengenstrom des zu fördernden Wassers als Kühlmedium strömt,

und mit der weiteren Maßgabe, daß der Kühlspaltraum (15) umlaufend eine Spaltdicke (d) aufweist, die unter Berücksichtigung der Druckdifferenz zwischen Zylinderraum (13) und Exzenterwellenraum (14) beim Förderhub einen Mindestteilmengenstrom des Kühlmediums gewährleistet, welcher sicherstellt, daß im Dauerbetrieb der Hochdruckwasserpumpe eine Temperatur der Zylinderbuchse (2) von 100° C nicht überschritten wird.High-pressure water pump, which has at least one cylinder, a cylinder liner, a cylinder head, a metallic piston guided in the cylinder liner and a piston guide shoe, as well as an eccentric shaft housing, a driven eccentric shaft and bearing in the eccentric shaft housing, and pressure-controlled suction and delivery valves with valve closure pieces,

where there are functional contacts between the eccentric shaft and the piston guide shoe and between the piston guide shoe and the piston,

a cylinder space being formed by the piston, the cylinder liner and the cylinder head,

an eccentric shaft space being enclosed by the eccentric shaft housing,

wherein with the piston, water is sucked into the cylinder chamber under low pressure in a suction stroke from the eccentric shaft chamber and is conveyed out of the cylinder chamber under high pressure in a delivery stroke, and

a gap being set up between the piston and the cylinder liner,

characterized,

that for the purpose of using the high-pressure water pump for conveying practically lubricant-free water for the cylinder liner (2), a material from the group of high-strength thermoplastic materials based on polyether ether ketone is used, with the proviso that

that the gap between the piston (4) and the cylinder liner (2) is designed as a cooling gap (15) through which a partial flow of the water to be pumped flows as a cooling medium during the delivery stroke,

and with the further proviso that the cooling gap (15) has a circumferential gap thickness (d) which, taking into account the pressure difference between the cylinder space (13) and the eccentric shaft space (14) during the delivery stroke, ensures a minimum partial flow of the cooling medium, which ensures that in continuous operation the High pressure water pump a temperature of the cylinder liner (2) of 100 ° C is not exceeded. Hochdruckwasserpumpe nach Anspruch 1, dadurch gekennzeichnet, daß für die Zylinderbuchse ein Werkstoff aus der Gruppe der hochfesten thermoplastischen Kunststoffe auf Polyetheretherketon-Basis ohne Füllstoffe verwendet ist.High-pressure water pump according to claim 1, characterized in that a material from the group of high-strength thermoplastic plastics based on polyether ether ketone without fillers is used for the cylinder liner. Hochdruckwasserpumpe nach Anspruch 1, dadurch gekennzeichnet, daß für die Zylinderbuchse ein Werkstoff aus der Gruppe der hochfesten thermoplastischen Kunststoffe auf Polyetheretherketon-Basis mit Kohlenstoffasern als Füllstoff verwendet ist.High-pressure water pump according to Claim 1, characterized in that a material from the group of high-strength thermoplastic plastics based on polyether ether ketone with carbon fibers as filler is used for the cylinder liner. Hochdruckwasserpumpe nach Anspruch 1, dadurch gekennzeichnet, daß für die Zylinderbuchse ein Werkstoff aus der Gruppe der hochfesten thermoplastischen Kunststoffe auf Polyetheretherketon-Basis mit PTFE als Füllstoff verwendet ist.High-pressure water pump according to Claim 1, characterized in that a material from the group of high-strength thermoplastic plastics based on polyether ether ketone with PTFE as filler is used for the cylinder liner. Hochdruckwasserpumpe nach Anspruch 1, dadurch gekennzeichnet, daß für die Zylinderbuchse ein Werkstoff aus der Gruppe der hochfesten thermoplastischen Kunststoffe auf Polyetheretherketon-Basis mit Kohlenstoffasern und PTFE als Füllstoffe verwendet ist.High-pressure water pump according to Claim 1, characterized in that a material from the group of high-strength thermoplastic plastics based on polyether ether ketone with carbon fibers and PTFE is used as fillers for the cylinder liner. Hochdruckwasserpumpe nach Anspruch 1, dadurch gekennzeichnet, daß für die Zylinderbuchse ein Werkstoff aus der Gruppe der hochfesten thermoplastischen Kunststoffe auf Polyetheretherketon-Basis mit Glasfasern als Füllstoff verwendet ist.High-pressure water pump according to Claim 1, characterized in that a material from the group of high-strength thermoplastic plastics based on polyether ether ketone with glass fibers is used as filler for the cylinder liner. Hochdruckwasserpumpe nach Anspruch 1, dadurch gekennzeichnet, daß für die Zylinderbuchse ein Werkstoff aus der Gruppe der hochfesten thermoplastischen Kunststoffe auf Polyetheretherketon-Basis mit Mineralien als Füllstoff verwendet ist.High-pressure water pump according to claim 1, characterized in that a material from the group of high-strength thermoplastic plastics based on polyether ether ketone with minerals is used as filler for the cylinder liner. Hochdruckwasserpumpe nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß der Werkstoff aus der Gruppe der hochfesten thermoplastischen Kunststoffe auf Polyetheretherketon-Basis eine Härte von mindestens 110 auf der Rockwell Skala "M" aufweist.High-pressure water pump according to one of claims 1 to 7, characterized in that the material from the group of high-strength thermoplastic plastics based on polyether ether ketone has a hardness of at least 110 on the Rockwell scale "M". Hochdruckwasserpumpe nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß der Werkstoff aus der Gruppe der hochfesten thermoplastischen Kunststoffe auf Polyetheretherketon-Basis eine Wärmeleitfähigkeit von mindestens 0,80 W/mK aufweist.High-pressure water pump according to one of claims 1 to 8, characterized in that the material from the group of high-strength thermoplastic plastics based on polyether ether ketone has a thermal conductivity of at least 0.80 W / mK. Hochdruckwasserpumpe nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß die Zylinderbuchse eine Rauhtiefe von Rz < 2,5 µm und Rz > 1,5 µm aufweist.High-pressure water pump according to one of claims 1 to 9, characterized in that the cylinder liner has a roughness depth of R z <2.5 µm and R z > 1.5 µm. Hochdruckwasserpumpe nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß die Zylinderbuchse in den Zylinder eingeklebt ist.High-pressure water pump according to one of claims 1 to 10, characterized in that the cylinder liner is glued into the cylinder. Hochdruckwasserpumpe nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, daß der Kühlspaltraum bei Raumtemperatur ein Verhältnis von Spaltdicke zu Spaltlänge im Bereich von 0,0005 bis 0,0007 aufweist.High-pressure water pump according to one of claims 1 to 11, characterized in that the cooling gap space at room temperature has a ratio of gap thickness to gap length in the range from 0.0005 to 0.0007. Hochdruckwasserpumpe nach einem der Ansprüche 1 bis 12, dadurch gekennzeichnet, daß der den Kühlspaltraum beim Förderhub als Kühlmedium durchströmende Teilmengenstrom im Bereich von 0,0002 Vol.% bis 0,0003 Vol.% des angesaugten Gesamtmengenstromes liegt.High-pressure water pump according to one of claims 1 to 12, characterized in that the partial flow flowing through the cooling gap during the delivery stroke as the cooling medium is in the range from 0.0002% by volume to 0.0003% by volume of the total flow sucked in. Hochdruckwasserpumpe nach einem der Ansprüche 1 bis 13, dadurch gekennzeichnet, daß für den Kolbenführungsschuh ein Werkstoff aus der Gruppe der hochfesten thermoplastischen Kunststoffe auf Polyetheretherketon-Basis verwendet ist.High-pressure water pump according to one of claims 1 to 13, characterized in that a material from the group of high-strength thermoplastic materials based on polyether ether ketone is used for the piston guide shoe. Hochdruckwasserpumpe nach einem der Ansprüche 1 bis 14, dadurch gekennzeichnet, daß für die Ventilverschlußstücke ein Werkstoff aus der Gruppe der hochfesten thermoplastischen Kunststoffe auf Polyetheretherketon-Basis verwendet ist.High-pressure water pump according to one of claims 1 to 14, characterized in that a material from the group of high-strength thermoplastic plastics based on polyether ether ketone is used for the valve closure pieces. Hochdruckwasserpumpe nach einem der Ansprüche 1 bis 15, dadurch gekennzeichnet, daß die Exzenterwelle in Gleitlagern mit Gleitlagerschalen gelagert ist.High-pressure water pump according to one of claims 1 to 15, characterized in that the eccentric shaft is mounted in plain bearings with plain bearing shells. Hochdruckwasserpumpe nach einem der Ansprüche 1 bis 16, dadurch gekennzeichnet, daß für die Gleitlagerschalen ein Werkstoff aus der Gruppe der hochfesten thermoplastischen Kunststoffe auf Polyetheretherketon-Basis verwendet ist.High-pressure water pump according to one of claims 1 to 16, characterized in that a material from the group of high-strength thermoplastic plastics based on polyether ether ketone is used for the slide bearing shells. Hochdruckwasserpumpe nach einem der Ansprüche 1 bis 17, dadurch gekennzeichnet, daß mehrere Zylinder in Reihe angeordnet sind.High-pressure water pump according to one of claims 1 to 17, characterized in that several cylinders are arranged in series. Hochdruckwasserpumpe nach einem der Ansprüche 1 bis 18, dadurch gekennzeichnet, daß mehrere Zylinder in einer Ebene radial oder axial angeordnet sind.High-pressure water pump according to one of claims 1 to 18, characterized in that several cylinders are arranged radially or axially in one plane. Verwendung einer Hochdruckwasserpumpe nach einem der Ansprüche 1 bis 19 im Untertagekohlebergbau.Use of a high pressure water pump according to one of claims 1 to 19 in underground coal mining. Verwendung einer Hochdruckwasserpumpe nach einem der Ansprüche 1 bis 19 als Druckpumpe in Hochdruckwasserstrahlreinigern.Use of a high pressure water pump according to one of claims 1 to 19 as a pressure pump in high pressure water jet cleaners. Verwendung einer Hochdruckwasserpumpe nach einem der Ansprüche 1 bis 19 als Druck- und Förderpumpe in einer High-Pressure-Liquid-Chromatography (HPLC)-Anlage.Use of a high-pressure water pump according to one of claims 1 to 19 as a pressure and feed pump in a high-pressure liquid chromatography (HPLC) system.
EP91107357A 1991-05-07 1991-05-07 High pressure water pump for purified water Expired - Lifetime EP0512138B1 (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
DK91107357.5T DK0512138T3 (en) 1991-05-07 1991-05-07 High pressure pump for purified water
DE59102642T DE59102642D1 (en) 1991-05-07 1991-05-07 High pressure water pump for pure water.
EP91107357A EP0512138B1 (en) 1991-05-07 1991-05-07 High pressure water pump for purified water
AT91107357T ATE110443T1 (en) 1991-05-07 1991-05-07 HIGH PRESSURE WATER PUMP FOR PURE WATER.
SU914895670A RU2013660C1 (en) 1991-05-07 1991-06-17 High-pressure water pump
PL91290702A PL166202B1 (en) 1991-05-07 1991-06-17 High-pressure pump for pumping clean water
US07/717,220 US5131818A (en) 1991-05-07 1991-06-18 High-pressure water pump having a polyetheretherketone cylinder bushing for pure water
JP3145904A JPH0599120A (en) 1991-05-07 1991-06-18 High pressure water pump for washing water
ZA915153A ZA915153B (en) 1991-05-07 1991-07-03 High-pressure water pump for pure water
CN91105004A CN1025064C (en) 1991-05-07 1991-07-23 High-pressure water pump for pumping water

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP91107357A EP0512138B1 (en) 1991-05-07 1991-05-07 High pressure water pump for purified water

Publications (2)

Publication Number Publication Date
EP0512138A1 true EP0512138A1 (en) 1992-11-11
EP0512138B1 EP0512138B1 (en) 1994-08-24

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ID=8206702

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US (1) US5131818A (en)
EP (1) EP0512138B1 (en)
JP (1) JPH0599120A (en)
CN (1) CN1025064C (en)
AT (1) ATE110443T1 (en)
DE (1) DE59102642D1 (en)
DK (1) DK0512138T3 (en)
PL (1) PL166202B1 (en)
RU (1) RU2013660C1 (en)
ZA (1) ZA915153B (en)

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WO1995016128A1 (en) * 1993-12-08 1995-06-15 Danfoss A/S Hydraulic piston engine
WO1995016129A1 (en) * 1993-12-08 1995-06-15 Danfoss A/S Hydraulic piston engine
WO1996002758A1 (en) * 1994-07-13 1996-02-01 Danfoss A/S Hydraulic axial piston machine
DE19708143A1 (en) * 1997-02-28 1998-09-03 Itt Mfg Enterprises Inc Piston for radial pump for motor vehicle brake system
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CN106121946A (en) * 2016-08-29 2016-11-16 樱田农机科技（泰州）有限公司 Insecticide sprayer high-pressure pump is with five cylinder plug assembly structures

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CN1066490A (en) 1992-11-25
PL166202B1 (en) 1995-04-28
CN1025064C (en) 1994-06-15
DE59102642D1 (en) 1994-09-29
US5131818A (en) 1992-07-21
DK0512138T3 (en) 1994-09-26
JPH0599120A (en) 1993-04-20
ZA915153B (en) 1992-07-29
RU2013660C1 (en) 1994-05-30
EP0512138B1 (en) 1994-08-24
PL290702A1 (en) 1992-11-16

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