WO1996015371A1 - Pump piston - Google Patents
Pump piston Download PDFInfo
- Publication number
- WO1996015371A1 WO1996015371A1 PCT/AU1995/000752 AU9500752W WO9615371A1 WO 1996015371 A1 WO1996015371 A1 WO 1996015371A1 AU 9500752 W AU9500752 W AU 9500752W WO 9615371 A1 WO9615371 A1 WO 9615371A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- side wall
- pump piston
- cup
- shaped body
- lip
- Prior art date
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
- 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
- F04B53/14—Pistons, piston-rods or piston-rod connections
Definitions
- the present invention relates to pistons for pumps and in particular to a piston for a water pump.
- Pump pistons reciprocate along a cylinder, and require sealing between the walls of the cylinder and the side walls of the piston.
- This sealing normally takes the form of piston rings located around the outer wall of the piston.
- the present invention seeks to provide a piston with an integral sealing means.
- the invention comprises a pump piston, adapted to pump liquids in a cylinder, comprising: a cup-shaped body made from a flexible material having a side wall extending from a base terminating in a lip at the free end; wherein said side wall is so configured that the side wall expands during the discharge stroke, to seal against the cylinder.
- the invention comprises a pump piston, adapted to pump liquids, comprising
- cup-shaped body made from a flexible material having a side wall extending from a base terminating in a lip at the free end;
- Figure 1 illustrates a prospective view of a piston in accordance with one embodiment of the present invention
- Figure 2 illustrates a half sectional view of the piston illustrated in figure 1 ;
- Figure 3 illustrates a part sectional view of the side wall of the piston illustrated in figure 1 ;
- Figure 4 illustrates a side view of the piston illustrated in figure 1 ;
- Figure 5 illustrates a plan view of the embodiment illustrated in above figures showing an exaggerated movement of the sealing arms
- Figure 6 illustrates the same sectional view as that of figure 3, but shown during the pumping stroke;
- Figure 7 illustrates a further embodiment of the present invention;
- Figure 8 illustrates cross sectional view of another embodiment of the present invention;
- Figure 9 illustrates a perspective view of another embodiment of the present invention
- Figure 10 illustrates a plan view of the piston shown in figure 9;
- FIG 11 illustrates a double acting piston according to another embodiment of the present invention
- figure 12 illustrates schematically an apparatus for cutting the spiral cuts
- figure 13 illustrates a further view of the apparatus shown in figure 12.
- a pump piston (1 ) as shown in figures 1 to 6, comprises a cup-shaped body (2) having a side wall (3) from a base (4).
- a central bore (5) extends through the base (4) to receive the drive rod (not shown) to reciprocate the piston in the cylinder.
- Located around the lip (6) of the side wall (3) are three cuts ( 7,8 & 9 ), which extend completely through the side wall (3).
- Each cut (7, 8 & 9) spirals from the lip (6) to adjacent the base (4), as shown in figures 2 and 4, and as shown in figure 3 the cuts (7, 8 & 9) are angled outwardly and away from the lip (6), at any suitable angle not necessary the angle, shown in figures 3 & 6.
- the cuts (7, 8 & 9) form sealing fingers (10, 11 & 12) which as shown in figures 5 & 6 pivot radially outwardly from the piston (1) during the pump discharge stroke, as a result of the axial vector (13) and the radial vector (14) of the fluid pressure.
- the cut surface (15) of finger (10) slides on the cut surface (16) of the side wall (3) forming a seal.
- Cut 7a-7b extends approximately 160° around the piston (1), with the lowest point 7b being approximately 45° behind the top cut 8a of the next cut 8a-8b. This pattern being repeated around the piston (1 ), preferably angle of the cuts is
- the invention is suitable for a double acting piston (17) shown in figure 7 where the construction of the fingers is the same as the other embodiment.
- a further embodiment is shown in figure 8, in which the piston (18) has the side wall (19) tapering to the lip (6).
- the material of construction is chosen to have a suitable flexibility to allow the side wall to expand outwardly during the pump stroke to seal against the wall of the cylinder.
- a variation of the piston in figure 8, is shown in figures 9 & 10, in which vertical cuts (20) are made at a number of positions around the side walls (19). Theses cuts (20) are substantially tangential to the inner surface (21) of the side Walls (19).
- the thus formed fingers (22) slide radially outwardly across each other and seal against the cylinder and themselves.
- a double acting cylinder (23) is shown in figure 11 , which is constructed n the same manner as that of figures 9 &10.
- FIG 12 and 13 An apparatus to make the spiral cuts of the pistons illustrated in figures 1 to 7 is shown in figure 12 and 13.
- the apparatus comprises a cutter blade holder (23) having a number of blades (24).
- a piston centring pin (25) is located in the center of the blades.
- the piston blank (26) is slid over the centring pin (25) which mates in the central bore (5) of the piston blank (26).
- the piston blank (26) is rotated in the direction of arrow 27, and the blades (24) cut the spiral cuts (7, 8 & 9).
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Details Of Reciprocating Pumps (AREA)
- Reciprocating Pumps (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU38359/95A AU3835995A (en) | 1994-11-11 | 1995-11-13 | Pump piston |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AUPM9355 | 1994-11-11 | ||
AUPM9355A AUPM935594A0 (en) | 1994-11-11 | 1994-11-11 | Pump piston |
AUPN0574 | 1995-01-16 | ||
AUPN0574A AUPN057495A0 (en) | 1995-01-16 | 1995-01-16 | Pump piston |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996015371A1 true WO1996015371A1 (en) | 1996-05-23 |
Family
ID=25644812
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AU1995/000752 WO1996015371A1 (en) | 1994-11-11 | 1995-11-13 | Pump piston |
Country Status (3)
Country | Link |
---|---|
CN (1) | CN1140484A (en) |
CA (1) | CA2180939A1 (en) |
WO (1) | WO1996015371A1 (en) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE819966A (en) * | 1973-09-28 | 1975-01-16 | HIGH-PRESSURE HYDRAULIC MACHINES PISTONS IMPROVEMENTS | |
US3897072A (en) * | 1973-02-12 | 1975-07-29 | Crane Packing Co | Slit ring with connecting membrane |
GB2137697A (en) * | 1983-03-16 | 1984-10-10 | Loctite Corp | Dripless syringe |
US4540352A (en) * | 1982-09-11 | 1985-09-10 | Erich Becker | Pendular piston pump having a cup-shaped sealing element |
EP0171892A2 (en) * | 1984-06-18 | 1986-02-19 | Trw Inc. | Reciprocating pump piston |
GB2183747A (en) * | 1985-12-04 | 1987-06-10 | Teves Gmbh Alfred | Piston and cylinder assembly including a seal arrangement |
-
1995
- 1995-11-13 CN CN 95191556 patent/CN1140484A/en active Pending
- 1995-11-13 WO PCT/AU1995/000752 patent/WO1996015371A1/en active Application Filing
- 1995-11-13 CA CA 2180939 patent/CA2180939A1/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3897072A (en) * | 1973-02-12 | 1975-07-29 | Crane Packing Co | Slit ring with connecting membrane |
BE819966A (en) * | 1973-09-28 | 1975-01-16 | HIGH-PRESSURE HYDRAULIC MACHINES PISTONS IMPROVEMENTS | |
US4540352A (en) * | 1982-09-11 | 1985-09-10 | Erich Becker | Pendular piston pump having a cup-shaped sealing element |
GB2137697A (en) * | 1983-03-16 | 1984-10-10 | Loctite Corp | Dripless syringe |
EP0171892A2 (en) * | 1984-06-18 | 1986-02-19 | Trw Inc. | Reciprocating pump piston |
GB2183747A (en) * | 1985-12-04 | 1987-06-10 | Teves Gmbh Alfred | Piston and cylinder assembly including a seal arrangement |
Also Published As
Publication number | Publication date |
---|---|
CN1140484A (en) | 1997-01-15 |
CA2180939A1 (en) | 1996-05-23 |
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