WO2008151628A1 - Pompe à deux temps - Google Patents

Pompe à deux temps Download PDF

Info

Publication number
WO2008151628A1
WO2008151628A1 PCT/DK2008/000209 DK2008000209W WO2008151628A1 WO 2008151628 A1 WO2008151628 A1 WO 2008151628A1 DK 2008000209 W DK2008000209 W DK 2008000209W WO 2008151628 A1 WO2008151628 A1 WO 2008151628A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
pump
oil
outlet
pressure
Prior art date
Application number
PCT/DK2008/000209
Other languages
English (en)
Inventor
Bent Kortsen
Sune Libaek
Original Assignee
Iop Marine A/S
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 Iop Marine A/S filed Critical Iop Marine A/S
Publication of WO2008151628A1 publication Critical patent/WO2008151628A1/fr

Links

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
    • F04B5/00—Machines or pumps with differential-surface pistons
    • 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
    • F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
    • F04B9/12—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air
    • F04B9/123—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air having only one pumping chamber
    • F04B9/127—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air having only one pumping chamber rectilinear movement of the pumping member in the working direction being obtained by a single-acting elastic-fluid motor, e.g. actuated in the other direction by gravity or a spring

Definitions

  • the present invention relates to a two-step-pump with a piston sub-assembly comprising two concentric pistons, the bigger diameter piston being used to increase the oil flow to an outlet connection until the pressure at the outlet connection has reached a predetermined value, whereafter the small diameter piston continues to pump oil after the bigger piston has stopped pumping oil to the outlet connection.
  • US patent No. 5,575,627 discloses a pump including a high pressure portion and a low pressure portion. During low pressure, high volume operation, pressure produced in the high pressure portion of the pump is applied to drive a large area piston in the low pressure portion of the pump. Once the pressure in the high pressure portion of the pump raises to a cut-off pressure, at which time it takes excessive power to drive the large area piston, a cut-off valve opens to allow the high pressure portion of the pump to directly pump a relatively lower volume of fluid per stroke at a relatively higher pres- sure.
  • This pump is however manually operated.
  • US patent No, 6,190,142 discloses a manual air pump including an outer tube and an inner tube coaxially mounted in the outer tube.
  • the inner chamber is defined in the inner tube.
  • An outer chamber is defined between the outer tube and the inner tube.
  • a head is coupled to first ends of the inner and outer tubes.
  • the head includes a main passage communicated with the inner chamber and the outer chamber for supplying air to an object to be inflated.
  • An inner piston rod has a first end with an inner piston slidably received in the inner chamber.
  • the inner piston separates the inner chamber into a first chamber section adjacent to the head and a second chamber section distal to the head.
  • An outer piston rod has a first end with an outer piston slidably received in the outer chamber.
  • the outer piston separates the outer chamber into a third chamber section adjacent to the head and a fourth chamber section distal to the head.
  • a handle is secured to second ends of the inner and outer piston rods to move therewith.
  • a release passage is provided for communicating one of the first chamber section and the third chamber section with environment.
  • a switchable valve is mounted in the release passage, wherein the release passage is blocked when the switchable valve is in a first status for high volume/low pressure pumping, and wherein the release passage is opened when the switchable valve is in a second status for high pressure/low volume pumping in which air is only flowable from the one of the first chamber section and the third chamber section to environment.
  • the aspect of the invention is to provide a two-step-pump comprising two concentric pistons, said pump being more simple than previously known.
  • a two-step-pump is according to the invention characterised in that when the piston sub-assembly is moved up, two inlet one-way valves to the underside of the two pis- tons open and oil is delivered to the underside of the two pistons, whereafter the piston sub-assembly is moved down, preferably by means of a gas under pressure and the one-way inlet valves are closed, while two outlet one-way valves open, and when the outlet pressure has reached a predetermined value controlled by means of a relief valve, the relief valve opens and the oil pumped by the bigger diameter piston is led back to the oil tank, the outlet one-way valve being kept closed because of the high pressure, whereafter the small diameter piston continues to pump at a high pressure.
  • a two-step-pump is obtained which is more simple than previously known.
  • the moving down of the piston sub-assembly may be per- formed by means of a gas under pressure.
  • the gas pressure can be approximately 7 bar.
  • Figs. 1a, 1b, and 1c illustrate the principles of the two-step-pump in three different positions
  • Fig. 2 shows a perspective view of the two-step-pump in a specific embodiment
  • Fig. 3 shows a sectional view of the two-step-pump illustrated in Fig. 2.
  • the two-step-pump comprises a house including a piston sub-assembly with two concentric pistons in one piece, the bigger diameter piston 12 being used to increase the oil flow to an outlet connection 4 until the pressure and the outlet connection 4 has reached a predetermined value, whereafter the small diameter piston 11 continues to pump oil after the bigger piston 10 has stopped pumping oil to the outlet connection 4.
  • the two-step-pump with the piston sub-assembly is connected to a small air piston 6 for controlling the function of the two-step-pump.
  • An oil tank is connected to the inlet valves 1 , 2 of the two-step-pump.
  • the two-step-pump is further provided with an oil out- let valve 4.
  • the two-step-pump functions in the following way:
  • Air under pressure is switched on and enters through an air orifice 14 to the back vol- ume of the air piston 6 and is thereafter delivered through an orifice 13 from the back volume of the air piston 6.
  • the air from the orifice 13 is delivered to the volume over the bigger diameter piston 12 of the two-step-pump.
  • the bigger diameter piston 12 is now moved down, conf. Fig. 1a.
  • the oil inlet valves 1 , 2 are closed due to the pressure created by the piston 10.
  • the outlet valves 3, 4 are open due to the same pressure.
  • a spring 9 under the piston 12 is compressed.
  • a pilot valve 8 opens, and the air from the air inlet is delivered through pilot valve 8 to the orifice 15 and the front volume of the air piston 6.
  • the air piston 6 is therefore pushed to the left due to the pressure, and the air passes the orifice 14 and thereafter the orifice 13 and the volume over the bigger diameter piston 12.
  • the pressurised air pushes the bigger diameter piston 12 down again, conf. 1c.
  • Pistons 10 and 11 continue to pump oil to the oil outlet 4.
  • this valve 5 opens and the oil pumped by the piston 10 is returned to the oil tank. From this moment, the outlet valve 3 is closed, and only the smaller diameter piston 11 continues to pump oil through the oil outlet 4 at a higher pressure.
  • Fig. 3 illustrates a specific embodiment of the two-step-pump.

Landscapes

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

Abstract

Cette invention concerne une pompe à deux temps avec un piston comprenant simplement deux pistons concentriques. Dans ladite pompe, le piston qui présente le diamètre le plus grand est utilisé pour accroître le débit d'huile vers une connexion de sortie jusqu'à ce que la pression à la connexion de sortie ait atteint une valeur prédéterminée. Puis le piston qui présente le diamètre le plus petit continue à pomper de l'huile après que le piston le plus grand a arrêté de pomper de l'huile vers la connexion de sortie. Selon l'invention, le sous-ensemble de piston est déplacé vers le haut, deux soupapes d'admission unidirectionnelles (1, 2) situées en dessous des deux pistons s'ouvrent et de l'huile est distribuée vers le côté inférieur des deux pistons. puis le sous-ensemble de piston est déplacé vers le bas, de préférence au moyen d'une sous-pression gazeuse et les soupapes d'admission unidirectionnelles (1, 2) sont fermées, tandis que deux soupapes unidirectionnelles de refoulement sont ouvertes. Quand la pression de sortie a atteint une valeur prédéterminée contrôlée au moyen d'un clapet de décharge, le clapet de décharge s'ouvre et l'huile pompée par le piston ayant le diamètre le plus grand est réacheminée vers le réservoir d'huile tandis que la soupape unidirectionnelle de sortie est maintenue fermée du fait de la pression élevée. enfin le piston ayant le diamètre le plus petit continue à pomper à une pression élevée. On obtient ainsi une pompe à deux temps, qui est plus simple que celles de l'art antérieur.
PCT/DK2008/000209 2007-06-12 2008-06-06 Pompe à deux temps WO2008151628A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA200700848 2007-06-12
DKPA200700848 2007-06-12

Publications (1)

Publication Number Publication Date
WO2008151628A1 true WO2008151628A1 (fr) 2008-12-18

Family

ID=39739851

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK2008/000209 WO2008151628A1 (fr) 2007-06-12 2008-06-06 Pompe à deux temps

Country Status (1)

Country Link
WO (1) WO2008151628A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104126109A (zh) * 2012-02-22 2014-10-29 Iop海运公司 测试气体关断阀的方法以及用于实施此方法的系统
JP2018066288A (ja) * 2016-10-18 2018-04-26 豊興工業株式会社 電磁ポンプ

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH222024A (fr) * 1939-09-28 1942-06-30 Limited E M B Company Pompe hydraulique.
US4357798A (en) * 1980-03-13 1982-11-09 Michael Hung Rapid actuating device of hydraulic actuator
WO1984002558A1 (fr) * 1982-12-29 1984-07-05 Peter Norton Systeme de pompe hydraulique a deplacements multiples avec regulation automatique du deplacement pour servo-freins ou autres
EP0269500A2 (fr) * 1986-11-21 1988-06-01 Kabushiki Kaisha Kosmek Pompe à piston plongeur du type pressuration rapide

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH222024A (fr) * 1939-09-28 1942-06-30 Limited E M B Company Pompe hydraulique.
US4357798A (en) * 1980-03-13 1982-11-09 Michael Hung Rapid actuating device of hydraulic actuator
WO1984002558A1 (fr) * 1982-12-29 1984-07-05 Peter Norton Systeme de pompe hydraulique a deplacements multiples avec regulation automatique du deplacement pour servo-freins ou autres
EP0269500A2 (fr) * 1986-11-21 1988-06-01 Kabushiki Kaisha Kosmek Pompe à piston plongeur du type pressuration rapide

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104126109A (zh) * 2012-02-22 2014-10-29 Iop海运公司 测试气体关断阀的方法以及用于实施此方法的系统
JP2018066288A (ja) * 2016-10-18 2018-04-26 豊興工業株式会社 電磁ポンプ

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