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
  • F04B23/00—Pumping installations or systems
  • F04B23/04—Combinations of two or more pumps
  • F04B23/08—Combinations of two or more pumps the pumps being of different types
  • F04B23/10—Combinations of two or more pumps the pumps being of different types at least one pump being of the reciprocating positive-displacement 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
  • F04B7/00—Piston machines or pumps characterised by having positively-driven valving
  • F04B7/02—Piston machines or pumps characterised by having positively-driven valving the valving being fluid-actuated
  • F04B7/0266—Piston machines or pumps characterised by having positively-driven valving the valving being fluid-actuated the inlet and discharge means being separate members
• • 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
  • F04B23/00—Pumping installations or systems
  • F04B23/04—Combinations of two or more pumps
  • F04B23/08—Combinations of two or more pumps the pumps being of different types
  • F04B23/14—Combinations of two or more pumps the pumps being of different types at least one pump being of the non-positive-displacement 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
  • 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
• • 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
  • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
  • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
  • F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
  • F04B9/045—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms the means being eccentrics
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
  • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
  • F05B2210/00—Working fluid
  • F05B2210/10—Kind or type
  • F05B2210/11—Kind or type liquid, i.e. incompressible

Definitions

• the invention relates to a method for the operation o ⁇ a hydraulic system comprising a piston pump with suction and pressure valves, whereby said pump pres ⁇ ses fluid out into a system of pipes where valves serve to lead the fluid to the desired elements such as activation devices or the like, and also a piston pump for use for this purpose.
• Piston pumps which are used as pumps in hydraulic systems of this kind are prqvided with suction and pressure valves which are opened and closed as a fun- ction of the prevailing pressure and mechanical in ⁇ fluence from springs, push rods or similar devices, in relation to the operation of the pump.
• Springs of this kind must have a considerable strength in order to be able to function in a safe and reliable manner under such varying operational conditions, both the mechanical as well as chemical conditions.
• Push rods must pass through stuffing box ⁇ es and the like, and therefore require maintenance and lubrication in order to be able to function in a reliable manner.
• the closing of the pressure side will mean that the fluid must be able to return to the pump's low-pressure side, here ⁇ by avoiding damage to the pump. This means that a relatively complicated system must be mounted for the return of the fluid from the pressure side, depend ⁇ ing on the pump volume.
• the object of the invention is to remedy these dis ⁇ advantages of the known systems with pi-ston pumps, and this is achieved by a method for the operation of such systems when the fluid is led to the suction side of the pump in an amount which at least corres ⁇ ponds to the amount supplied from the pump's pressure side, and which opens the suction valve.
• a simplification of the operation of the pump's suction valve in that the use is avoided of mechanical influences from springs or push rods, which are normally used to open the suction valve.
• the mechanical construction of the piston is simplified, in that the piston will be pressed back by the hydraulic pressure in the pump chamber when the necessary pressure ex ⁇ ists above the piston.
• the complicated mechanical activating parts, such as piston rod and " crank can hereby be omitted completely, and be replaced by a simple moving mechanism, e.g. in the form of a rota- ting eccentric.
• the pump can therefore be simplified considerably, both with regard to its construction as well as dur ⁇ ing operation, in that it can consist of more simple construction elements such as ball valves and cylin ⁇ drical pistons and cylinders.
• the diagram shows an example of a typical hydraulic system which comprises the components necessary for the method described.
• the system is configured as a closed system, with a fluid tank 1 from which the fluid is sucked and supplied.
• the fluid is pumped from the tank 1 by a flow-pump 2, such as a radial pump or centrifugal pump, through conditioning elements such as a filter 3 and a cooler 4.
• a flow-pump 2 such as a radial pump or centrifugal pump
• valve 5 which can serve partly to regulate the supply to the actual piston pump 15, and partly to create a bypass or re- turn to the tank 1.
• the actual piston pump 15 comprises a drive part 12 with a driving rotating shaft 11 on which an eccen- trie 10 is mounted.
• This drive part 12 can be designed as an independent unit which can be dismantled and mounted independent ⁇ ly of the actual pump part 13.
• the pump part 13, of which only a single piston 9 is shown, comprises in addition to the reciprocating piston 9 a pump chamber 14 which has a suction side and a pressure side.
• the suction side is provided with a valve 6, which in the example shown is a simple ball valve, consist ⁇ ing of a ball which when in the open condition, as shown, is moved away from the valve seating, and is thus in the open position.
• a valve 6 which in the example shown is a simple ball valve, consist ⁇ ing of a ball which when in the open condition, as shown, is moved away from the valve seating, and is thus in the open position.
• the pressure side has a valve 7 which opens for passage when the fluid from the pump chamber presses the ball away from its seat- ing.
• the fluid is led from the piston pump 15 to the de ⁇ sired activation element 16 which, for example, can be a cylinder or motor.
• the method also provides the possibility of a consid- erable simplification of the components which are used in the system, whereby a saving is effected in investments and maintenance.
• valves 7 and 8 in the piston pump can thus be designed in such a simple manner that they comprise only a freely-movable valve element such as a ball.
• piston pump's piston 9 can be accom ⁇ modated loosely in the housing, and it will be able to be separated from the eccentric 10 of the driving part, in that there will not be any springs, push rods or other mechanical connections between the drive part 12 and the pump part 13.
• the servopump 2 ensures that no cavitation occurs on the suction side of the piston pump, in that the flu ⁇ id is led to the pump chamber under pressure, which can overcome possible pressure drops through filters, coolers or other devices.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Details Of Reciprocating Pumps (AREA)
• Reciprocating Pumps (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=8140166

Family Applications (1)

Country Status (9)

Families Citing this family (2)

Citations (2)

• 1984
  • 1984-10-30 DK DK517884A patent/DK153719B/da not_active Application Discontinuation
• 1985
  • 1985-10-29 EP EP85905606A patent/EP0199798A1/en not_active Withdrawn
  • 1985-10-29 GB GB08613805A patent/GB2179707B/en not_active Expired
  • 1985-10-29 WO PCT/DK1985/000101 patent/WO1986002702A1/en active Application Filing
  • 1985-10-29 JP JP60504993A patent/JPS62500676A/ja active Pending
  • 1985-10-29 DE DE19853590547 patent/DE3590547T1/de not_active Withdrawn
  • 1985-10-29 AU AU50910/85A patent/AU5091085A/en not_active Abandoned
• 1986
  • 1986-06-27 KR KR1019860700399A patent/KR870700268A/ko not_active Application Discontinuation
  • 1986-06-27 SE SE8602871A patent/SE8602871D0/xx not_active Application Discontinuation

Patent Citations (2)

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