WO2008151628A1 - Two-step-pump - Google Patents
Two-step-pump Download PDFInfo
- 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
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
Two-step-pump with a piston simply 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. According to the invention the piston-sub-assembly is moved up, two inlet one-way valves (1, 2) to the underside of the two pistons 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 (1, 2) are closed, while two outlet one-way valves open, when the outlet pres¬ sure 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, where- after the small diameter piston continues to pump at a high pressure. As a result, a two-step-pump is obtained which is more simple than previously known.
Description
Title: Two-step-pump
Technical Field
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.
Background
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.
Disclosure of the Invention
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. As a result, a two-step-pump is obtained which is more simple than previously known.
According to the invention, 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.
Brief Description of the Drawing(s)
The invention is explained in detail below with reference to the drawing(s), in which
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, and
Fig. 3 shows a sectional view of the two-step-pump illustrated in Fig. 2.
Detailed description of the Invention
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. At the bottom of the stroke of the bigger diameter piston 12, a spring 9 under the piston 12 is compressed. When the bigger diameter piston 12 has reached the bottom, the end of the piston shaft has passed a groove 7, and air from the orifice 15 and the front volume of the air piston 6 is released to the atmospheric pressure through said groove 7. The front volume of the air piston 6 is now at atmospheric pressure. The piston 6 is there- fore pushed to the right by means of the pressured air entering through the orifice 14. The orifice 13 is now connected to the atmospheric pressure. Now, the bigger diameter piston 12 is moved up, conf. Fig. 1b, by means of the compressed spring 9, and the air in the volume over the bigger diameter piston 12 is released through the orifice 13 to the atmosphere. When the bigger diameter piston is at the top of its stroke, 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. Now, 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. When the pressure at the oil outlet 4 reaches the opening pressure of a release valve 5, 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.
An advantage of this two-step-pump is that it is rather simple and can be operated by means of pressurised air only.
Fig. 3 illustrates a specific embodiment of the two-step-pump.
Claims
1. 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, characterised in that when the piston sub-assembly is moved up, two inlet one-way valves (1 , 2) to the underside of the two pistons open and oil is delivered to the underside of the two pistons, whereafter the pis- ton sub-assembly is moved down, preferably by means of a gas under pressure and the one-way inlet valves (1 , 2) 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.
2. Two-step-pump according to claim 1 , characterised in that the moving down of the piston sub-assembly is performed by means of a gas under pressure.
3. Two-step-pump according to claim 2, characterised in that the pressure is between 0 and 10 bar, approximately 7 bar.
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 (en) | 2008-12-18 |
Family
ID=39739851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/DK2008/000209 WO2008151628A1 (en) | 2007-06-12 | 2008-06-06 | Two-step-pump |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2008151628A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104126109A (en) * | 2012-02-22 | 2014-10-29 | Iop海运公司 | Method of testing gas shut-down valve and system for exercising same |
| JP2018066288A (en) * | 2016-10-18 | 2018-04-26 | 豊興工業株式会社 | Electromagnetic pump |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH222024A (en) * | 1939-09-28 | 1942-06-30 | Limited E M B Company | Hydraulic pump. |
| US4357798A (en) * | 1980-03-13 | 1982-11-09 | Michael Hung | Rapid actuating device of hydraulic actuator |
| WO1984002558A1 (en) * | 1982-12-29 | 1984-07-05 | Peter Norton | Multiple displacement hydraulic pump sytem with automatic displacement control for brake boosters and the like |
| EP0269500A2 (en) * | 1986-11-21 | 1988-06-01 | Kabushiki Kaisha Kosmek | Plunger pump of quick pressure-rise type |
-
2008
- 2008-06-06 WO PCT/DK2008/000209 patent/WO2008151628A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH222024A (en) * | 1939-09-28 | 1942-06-30 | Limited E M B Company | Hydraulic pump. |
| US4357798A (en) * | 1980-03-13 | 1982-11-09 | Michael Hung | Rapid actuating device of hydraulic actuator |
| WO1984002558A1 (en) * | 1982-12-29 | 1984-07-05 | Peter Norton | Multiple displacement hydraulic pump sytem with automatic displacement control for brake boosters and the like |
| EP0269500A2 (en) * | 1986-11-21 | 1988-06-01 | Kabushiki Kaisha Kosmek | Plunger pump of quick pressure-rise type |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104126109A (en) * | 2012-02-22 | 2014-10-29 | Iop海运公司 | Method of testing gas shut-down valve and system for exercising same |
| JP2018066288A (en) * | 2016-10-18 | 2018-04-26 | 豊興工業株式会社 | Electromagnetic pump |
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