EP0136366A1 - Freikolbenpumpe - Google Patents

Freikolbenpumpe Download PDF

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Publication number
EP0136366A1
EP0136366A1 EP83109826A EP83109826A EP0136366A1 EP 0136366 A1 EP0136366 A1 EP 0136366A1 EP 83109826 A EP83109826 A EP 83109826A EP 83109826 A EP83109826 A EP 83109826A EP 0136366 A1 EP0136366 A1 EP 0136366A1
Authority
EP
European Patent Office
Prior art keywords
piston
under pressure
gas
port
piston assembly
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.)
Withdrawn
Application number
EP83109826A
Other languages
English (en)
French (fr)
Inventor
Raymond A. Bergloff
James T. Hollis
Oswald A. Walkes
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.)
Woodward HRT Inc
Original Assignee
Woodward HRT Inc
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 Woodward HRT Inc filed Critical Woodward HRT Inc
Priority to EP83109826A priority Critical patent/EP0136366A1/de
Publication of EP0136366A1 publication Critical patent/EP0136366A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L25/00—Drive, or adjustment during the operation, or distribution or expansion valves by non-mechanical means
    • F01L25/02—Drive, or adjustment during the operation, or distribution or expansion valves by non-mechanical means by fluid means
    • F01L25/04—Drive, or adjustment during the operation, or distribution or expansion valves by non-mechanical means by fluid means by working-fluid of machine or engine, e.g. free-piston machine
    • 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
    • F04B9/1276—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 with fluid-actuated inlet or outlet valve

Definitions

  • a gas operated, free piston pumping apparatus which has at least three piston assemblies, each of which is operably connected to a separate three-way control valve.
  • Each of the control valves has first and second positions.
  • Means is provided for positioning the control valve in its first position responsive to another piston assembly approaching the completion of its exhaust stroke. When in its first position, gas under pressure is provided from the source thereof to the control valves associated piston assembly.
  • Means is also provided for positioning the control valve in its second position when its associated piston assembly is completing its exhaust stroke. When in its second position the gas under pressure is removed from its associated piston assembly and the assembly is vented.
  • each of the at least three piston assemblies is positioned to reciprocate within respective cylinders which are divided into a gas portion and a hydraulic portion.
  • the source of gas under pressure is connected through appropriate control valves to the gas portion of each of the cylinders.
  • Each of the gas portions of the cylinders includes two control ports positioned in spaced apart portions at the end of the piston exhaust (power) stroke.
  • gas pressure is applied through an appropriate passageway to position the control valve for a second piston assembly to commence its power stroke.
  • the control valve for that piston assembly is actuated to disconnect it from the source of gas under pressure and to connect it to return. Therefore, it can be seen that each of the cylinders is pressurized with a gas under pressure prior to the end of the power stroke of the preceding cylinder to maintain a constant output hydraulic pressure at all times.
  • the single Figure is a schematic diagram of a free piston pump assembly constructed in accordance with the principles of the present invention.
  • a free piston pump system 10 which includes a housing 12 within which there is disposed a pumping portion 14 having associated therewith gas control valves 16 and hydraulic control valves 18.
  • the gas control valves 16 control the application of gas under pressure from a source 20 thereof to the gas portion of the pumping portion 14.
  • the hydraulic valve section 18 controls the flow of hydraulic fluid under pressure from the hydraulic portion of the pumping portion 14 to the load 22 and from the reservoir 24.
  • the gas control valves 16 function responsive to positioning of the pistons within the pumping portion 14. As a piston approaches the completion of its power stroke it activates a control valve to sequentially apply the pressurized gas to a next successive pumping section. As the piston approaches the end of its power stroke it vents the gas portion of the cylinder to gas return or atmosphere thereby allowing the hydraulic fluid under reservoir pressure to return the piston and fill'the hydraulic section of the valve preparatory to the next power or exhaust stroke. Thus a continuous flow of hydraulic fluid under pressure is provided responsive to the application of gas under pressure to the pumping portion 14 of the free piston pump assembly.
  • the pumping portion 14 includes three separate pump sections PS1, PS2 and PS3.
  • PS1 is shown in a position such that the exhaust or power stroke where hydraulic fluid under pressure has been expelled responsive to gas under pressure being applied thereto has been completed.
  • PS2 is shown at the commencement of its power stroke.
  • PS3 is at the ready position to , commence the power stroke; in this position the hydraulic section of PS3 is completely filled with fluid ready for expulsion in response to the application of gas under pressure. However, no gas under pressure is being applied to PS3.
  • PS1 includes cylinder 1 which is divided into chambers Cl and Hl, gas under pressure being applied to chamber Cl while hydraulic fluid is present in chamber Hl.
  • Reciprocally positioned within cylinder 1 are pistons Pl and P4 interconnected by piston rod 26.
  • Piston Pl is positioned within chamber Cl, while piston P4 is positioned within the chamber Hl.
  • Chamber Cl defines a pair of longitudinally displaced ports A and B adjacent that portion of the chamber Cl occupied by the piston P1 at the end of the power stroke thereof. It should be noted that port A is opened by piston Pl prior to port B. However, at the end of the power stroke of piston P1, both ports A and B are open.
  • Pump section PS2 is constructed similarly to that of PS1 and includes a cylinder 2 divided into chambers C2 and H2 within which are positioned pistons P2 and P5, respectively The pistons P2 and P5 are interconnected by piston rod 28. Ports C and D are positioned within chamber C2 and are disposed as described with respect to chambers A and B.
  • Piston section PS3 is similar to the previously described sections and includes a cylinder 3 divided into chambers C3 and H3 within which are positioned pistons P3 and P6 which are interconnected by a piston rod 30.
  • Chamber C3 defines ports E and F which are positioned as previously described.
  • the gas control valve section 16 includes three valves Vl, V2 and V3.
  • Control valve Vl is associated with pump section PS1
  • control valve V2 is associated with pump section PS2
  • control valve V3 is associated with pump section PS3.
  • Each of the valves VI, V2 and V3 controls the application of gas under pressure from the source 20 to the chambers Cl, C2 and C3, respectively, or alternatively controls the venting of the chambers Cl, C2 and C3 to gas return or atmosphere as shown at the outlet port 32.
  • the valve Vl includes a spool 34 positioned within a cylinder 36 which defines ports 38, 40 and 42. Lands 44 and 46 upon spool 34 open and close ports 38 and 42, respectively, to connect chamber Cl to the source of gas under pressure 20 or return, respectively. Spool 34 is positionable in only one of two positions which is controlled by a detent 48 which when positioned in the recess 52 holds the spool 34 in the position shown in Figure 1 and when positioned in the recess 50 holds it in such a position that port 42 is closed and port 38 is opened.
  • the valve V2 is constructed similarly to the valve V1 and includes a spool 54 movably mounted within a cylinder 56 which defines ports 58, 60 and 62.
  • the lands 64 and 66 respectively, open and close the ports 58 and 62.
  • a detent 68 positions the spool 54 in its two positions represented by the recesses or grooves 70 and 72. When in the position shown in the drawings, land 64 opens port 58 and supplies pressure to chamber C2.
  • Valve V3 is similar to valves Vl and V2 and includes the spool 74 positioned within the cylinder 76 which defines ports 78, 80 and 82.
  • the lands 84 and 86 open and close the ports 78 and 82, respectively.
  • the ' detent 88 is positioned within the recesses or grooves 90 and 92 to position the spool 74 in one of its respective positions. When in the position as shown in Figure 1, port 82 is open, connecting the gas return or atmosphere to chamber C3.
  • the hydraulic valve section 18 includes two sets of three each of spring loaded check valves.
  • the check valves CVl, CV2 and CV3 control the application of hydraulic fluid from the reservoir 24 to the chambers Hl, H2 and H3, respectively.
  • CV1 includes a poppet valve 100 which is continuously urged toward the right as viewed in the Figure by the spring 102.
  • the poppet 100 defines a port 104 through which hydraulic fluid flows into the chamber Hl when the poppet 100 is in the position as shown in the Figure.
  • a valve seat 106 receives the poppet 100 to preclude the flow of hydraulic fluid from the reservoir 24 into the chamber Hl when gas pressure is applied to chamber Cl and the piston P4 is pumping hydraulic fluid as will be described more fully below.
  • CV2 is identical to CV 1 and includes a poppet 110 which is continuously urged toward the right by the spring 112 and which defines the port 114.
  • a seat 116 receives the poppet 110 to block the flow of fluid as described below.
  • the valve CV3 is identical to the valves CV1 and CV2 and includes a poppet 120 which is spring loaded toward the right by the spring 122 and which defines a port 124 through which fluid flows from the reservoir 24 into the chamber H3.
  • a seat 126 receives a poppet 120 to seal and block the flow of the fluid into the chamber H3.
  • Valves EV1, EV2 and EV3 are spring loaded poppet valves which function to permit the flow of fluid under pressure from the chambers H1, H2 and H3 during the power stroke of the pump sections PS1, PS2 and PS3, respectively.
  • EV1 includes the poppet 130 which is spring loaded by the spring 132 upwardly as viewed in the Figure to close the port 134 when in the position shown and thus to block the flow of fluid through the outlet to the load 22. It will thus be recognized that the piston P4 has traveled to the end of its power stroke so that no more hydraulic fluid is being pumped from the chamber Hl to the load 22. Thus the spring 132 has positioned the poppet 130 to seal the port 134.
  • Valve EV2 is similar to the valve EV1 and includes the poppet 136 which is spring loaded by the spring 138 to control the port 140.
  • gas under pressure is applied through the port 58 and 60 to the chamber C2 thereby pressurizing it and causing the pistons P2 and P5 to move to the right as shown in the Figure.
  • Such movement applies pressure to the hydraulic fluid in the chamber H2, thereby opening the port 140 against the force of the spring 138 and allowing hydraulic fluid under pressure to flow through the outlet and to the load 22.
  • Valve EV3 is similar to valves EV1 and EV2 and includes the poppet 142 which is spring loaded to the position shown in the Figure by the spring 144 to close the port 146. As will be previously recalled spool 74, in the position shown, connects atmosphere through the ports 82 and 80 to the chamber C3. Hydraulic fluid has previously flowed through CV3 to fill chamber H3 in such a fashion that the piston assembly of PS3 has moved toward the left, completely filling the chamber H3 with hydraulic fluid thus readying pump section PS3 to pump the hydraulic fluid therefrom when gas under pressure is applied from the source thereof to the chamber C3.
  • passageways G, H and I connect the chambers C3, C2 and Cl, respectively to the ports 80, 60 and 40, respectively.
  • the outlet port 32 which exhausts to atmosphere is connected by the passageway 150 to the ports 42, 62 and 82.
  • the passageway 153 applies gas under pressure from the source 20 thereof through the inlet 31 to the ports 38, 58 and 78.
  • piston Pl is in a position such that it is toward the left from that shown in the Figure so that ports A and B are both closed and it will further be assumed that the spool 34 is in its position toward the right from that shown in the drawing so that port 42 is closed and port 38 is opened, thereby pressurizing chamber Cl.
  • the pistons in pump section PS1 are in the power stroke but are nearing the end thereof.
  • the piston Pl passes port A, it is opened thereby applying the pressure present in the chamber Cl through the passageway 151 to the chamber 152 at the left side of the spool 54 of valve V2.
  • piston P3 first will open port E applying gas pressure in chamber C3 through the passageway 166 to the chamber 168 at the left of spool 34 moving it toward the right so that the detent 48 engages the groove 50 to thereby close the port 42 and open the port 38 thus applying gas under pressure to the cylinder Cl causing it to move toward the right thus repeating the cycle as previously described.
  • valves IV1 and IV2 and IV3 are each associated with the control valves Vl, V2 and V3, respectively.
  • the valves IVI, IV2 and IV3 are used to preposition the control valves before system start up.
  • each of IVl, IV2, and IV3 includes a spring loaded plunger 168 which in response to the urging of the spring and in the absence of gas under pressure will position valve Vl in its rightmost position and valves V2 and V3 in their leftmost position as viewed in the Figure.
  • each of the plungers Upon the application of gas under pressure to the conduit 153 each of the plungers is retracted to the position shown in the drawing and will not function until the gas under pressure is removed from the system.
  • the positioning of the valves Vl, V2 and V3 by the plungers IVl, IV2 and IV3 places the valves in an appropriate position so that the sequencing as above described will always occur upon application of pressure to the system.
  • a fluid capture volume For purposes of limiting the travel of the piston assemblies in pump sections PS1, PS2 and PS3, there is provided a fluid capture volume, which is best illustrated in PS1 and PS3.
  • PS1 and PS3 As shown in the drawing, when the piston assembly is all the way to the right (PS1) an annular volume 170 of hydraulic fluid is captured between the piston P4 and the wall of the chamber Hl. The captured volume of fluid restricts the further movement of the piston assembly and precludes bottoming out thereof.
  • a similar capture volume 172 is provided in a reentrant bore 174 defined by the rod 30.
  • the bore receives a guide rod 176 therein.
  • the bore 174 is vented by a passageway 178 to define the volume 172.
  • the fluid (gas) remaining in the volume 172 functions to limit travel of the piston assembly beyond the compressibility thereof.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
EP83109826A 1983-09-30 1983-09-30 Freikolbenpumpe Withdrawn EP0136366A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP83109826A EP0136366A1 (de) 1983-09-30 1983-09-30 Freikolbenpumpe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP83109826A EP0136366A1 (de) 1983-09-30 1983-09-30 Freikolbenpumpe

Publications (1)

Publication Number Publication Date
EP0136366A1 true EP0136366A1 (de) 1985-04-10

Family

ID=8190715

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83109826A Withdrawn EP0136366A1 (de) 1983-09-30 1983-09-30 Freikolbenpumpe

Country Status (1)

Country Link
EP (1) EP0136366A1 (de)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2642045A (en) * 1950-02-20 1953-06-16 Brown Oil Tools Fluid motor having piston actuated pilot valve
US2652035A (en) * 1951-03-06 1953-09-15 Bayer Philip Hydraulic engine
US2858767A (en) * 1955-10-13 1958-11-04 Neil V Smith Pumping apparatus
US3019735A (en) * 1958-05-09 1962-02-06 Gen Motors Corp Gas driven hydraulic pump
US3650638A (en) * 1969-12-19 1972-03-21 Halliburton Co Hydraulically powered pump having a precompression function
FR2146019A5 (de) * 1971-07-12 1973-02-23 Dorr Oliver Inc
US3847511A (en) * 1973-10-16 1974-11-12 Halliburton Co Hydraulically powered triplex pump and control system therefor
US3916765A (en) * 1972-05-31 1975-11-04 Plessey Co Ltd Automatic control of ram-type fluid-pressure operated actuator units
DE2065829A1 (de) * 1970-12-24 1976-03-18 Halliburton Co Hydraulisch angetriebene dreizylindrige schubkolbenpumpe

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2642045A (en) * 1950-02-20 1953-06-16 Brown Oil Tools Fluid motor having piston actuated pilot valve
US2652035A (en) * 1951-03-06 1953-09-15 Bayer Philip Hydraulic engine
US2858767A (en) * 1955-10-13 1958-11-04 Neil V Smith Pumping apparatus
US3019735A (en) * 1958-05-09 1962-02-06 Gen Motors Corp Gas driven hydraulic pump
US3650638A (en) * 1969-12-19 1972-03-21 Halliburton Co Hydraulically powered pump having a precompression function
DE2065829A1 (de) * 1970-12-24 1976-03-18 Halliburton Co Hydraulisch angetriebene dreizylindrige schubkolbenpumpe
FR2146019A5 (de) * 1971-07-12 1973-02-23 Dorr Oliver Inc
US3916765A (en) * 1972-05-31 1975-11-04 Plessey Co Ltd Automatic control of ram-type fluid-pressure operated actuator units
US3847511A (en) * 1973-10-16 1974-11-12 Halliburton Co Hydraulically powered triplex pump and control system therefor

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

Designated state(s): BE DE FR GB IT LU NL SE

17P Request for examination filed

Effective date: 19850722

STAA Information on the status of an ep patent application or granted ep patent

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18W Application withdrawn

Withdrawal date: 19870724

RIN1 Information on inventor provided before grant (corrected)

Inventor name: HOLLIS, JAMES T.

Inventor name: BERGLOFF, RAYMOND A.

Inventor name: WALKES, OSWALD A.