EP3480460A1 - Pompe volumétrique - Google Patents
Pompe volumétrique Download PDFInfo
- Publication number
- EP3480460A1 EP3480460A1 EP17382733.8A EP17382733A EP3480460A1 EP 3480460 A1 EP3480460 A1 EP 3480460A1 EP 17382733 A EP17382733 A EP 17382733A EP 3480460 A1 EP3480460 A1 EP 3480460A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- chamber
- diaphragm
- volumetric pump
- linear actuator
- sub
- 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.)
- Granted
Links
- 239000012530 fluid Substances 0.000 claims description 26
- 238000004891 communication Methods 0.000 claims description 7
- 239000002775 capsule Substances 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000000908 micropen lithography Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000013590 bulk material Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- -1 dimensions Substances 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Images
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
- F04B7/00—Piston machines or pumps characterised by having positively-driven valving
-
- 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
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/0009—Special features
- F04B43/0081—Special features systems, control, safety measures
- F04B43/009—Special features systems, control, safety measures leakage control; pump systems with two flexible members; between the actuating element and the pumped fluid
-
- 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
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
- F04B43/04—Pumps having electric drive
- F04B43/043—Micropumps
- F04B43/046—Micropumps with piezoelectric drive
Definitions
- the invention refers to a mechanical pump for application in spacecraft, in particular in active thermal control systems, namely in Mechanically Pumped Driven Loops (MPDL) also known as Mechanically Pumped Loops (MPL).
- MPDL Mechanically Pumped Driven Loops
- MPL Mechanically Pumped Loops
- the thermal control of spacecraft equipment is an important feature of the spacecraft overall functionality, being one of the main thermal loads the heat generated at the electronic components.
- PTC passive thermal control
- ATC active thermal control
- Passive thermal control does not involve moving parts and relies solely on conductive and radiative heat paths to achieve thermal management, using components such as heat pipes, coatings, multi-layer insulation (MLI), sun shields, radiating fins, etc.
- Active thermal control requires input power and is commonly used in applications involving high heat loads.
- a mechanically pumped loop is an active thermal control (ATC) technique that uses a pumping device (a centrifugal or positive displacement pump) to move a fluid within a closed hydraulic circuit (loop).
- the fluid absorbs heat from a source (components that dissipate heat) and transfers it to a sink (an external surface that rejects heat to space by radiation).
- Mechanically pumped loops can be categorized as single-phase loops or two-phase loops.
- MPL Mechanically Pumped Loops
- centrifugal pumps are not suitable for double-phase loops since they are not self-priming, which are the current trends of the developments due to their higher heat transfer capacity and thermal stability.
- a reliable and durable mechanical pump would be desirable, in order to allow the application of MPL technology to high-capacity long-life applications, such as unmanned missions, serving telecommunications platforms, nuclear facilities, or any environment where reliability requirements are particularly high.
- Diaphragm pumps are devices with no tribological issues due to dynamic seals or any other friction elements, so they offer some advantages with respect to the aforementioned documents.
- the linear actuators used in these devices cannot provide the required strokes against the high-pressure forces typical of the applications indicated above and for the long-life demanded, so the person skilled in the art would not be prompt to use any of these devices as a solution for this problem.
- the invention provides a solution for this problem by means of a volumetric pump according to claim 1.
- Preferred embodiments of the invention are defined in dependent claims.
- the invention provides a volumetric pump comprising
- the proposed invention improves the performance with respect to other volumetric pumps because of the absence of friction and dynamic seals, thereby increasing the reliability and extending its lifetime and being specially indicated for spacecraft applications, including unmanned missions.
- the difference between the pressure at both sides of the diaphragm is only the differential pressure caused by the compression, but the diaphragm and, therefore, the actuator, have not to withstand the total fluid pressure. This also improves the lifetime of the pump.
- first diaphragm is clamped to the chamber does not exclude the possibility that both the first diaphragm and the chamber are manufactured together as a single part. This only makes reference to the fact that the diaphragm does not rotate or pivot with respect to the chamber, but the rotation is also restricted.
- the linear actuator is connected to the diaphragm by means of a coupling device.
- the linear actuator is a piezoelectric actuator.
- the linear actuator is a magnetostrictive actuator.
- These kind of actuators provide strokes in similar ranges to the piezoelectric actuators with lower actuation voltages and have potentially higher lifetimes since they are made of bulk material actuated electromagnetically.
- the first diaphragm has a central portion with a central thickness greater than the thickness in any point outside the central portion.
- This central reinforcement of the diaphragm improves the efficiency of the pump, since it maximizes the volume displacement by limiting the diaphragm deformation.
- This arrangement is a way of defining a secondary sub-chamber between two diaphragms, the linear actuator being configured to move the two diaphragms as a single piece, since they are solidly attached.
- the linear actuator is therefore kept outside the contact with the fluid, being a single way of preserving it from an aggressive environment.
- the second diaphragm has a lower surface than the first diaphragm.
- the coupling device comprises a protective capsule around the linear actuator, the linear actuator being located inside the secondary sub-chamber, so that the linear actuator is adapted to move the first diaphragm without being in direct contact with the working fluid of the secondary sub-chamber.
- the inlet and/or the outlet valve comprises
- valves of these embodiments are aimed for simplicity and reliability, since no electronic parts or controlled elements are present; the valves of these embodiments are passive valves, and are therefore less prone to be damaged.
- the inlet valve and/or the outlet valve is operated by a secondary piezoelectric actuator.
- valve of these embodiments are aimed for better performance, since the valve of these embodiments may be synchronized with the movement of the main actuator, not depending on fluid-dynamic effects.
- Figure 1 shows an exploded view of a first embodiment of a volumetric pump 1 according to the invention.
- This volumetric pump 1 comprises
- the chamber 2 comprises a compensation port 26, intended to provide fluid communication between one of the sub-chambers and the inlet port 23.
- Figure 2 provides a side cross section of such a volumetric pump 1. In this figure, the internal arrangement of each element may be seen.
- the chamber 2 is divided into a main sub-chamber 21 and a secondary sub-chamber 22 by means of the first diaphragm 5.
- the first diaphragm 5 has a first face 51 oriented towards the main sub-chamber 21 and a second face 52 opposite to the first face 51, being therefore oriented towards the secondary sub-chamber 22.
- An outer edge 53 of the first diaphragm 5 is clamped to the chamber, thus dividing the chamber 2 into a main sub-chamber 21 and a secondary sub-chamber 22.
- Both the main sub-chamber 21 and the secondary sub-chamber 22 are intended to be full of working fluid, so the difference between the pressure in the first face 51 and the second face 52 of the first diaphragm 5 is only due to the differential pressure provided by the first diaphragm movement.
- the inlet port 23, covered by the inlet valve 31, and the outlet port 24, covered by the outlet valve 32, are located in the main sub-chamber 21.
- the inlet port 23 is in fluid communication with the pump inlet 25, where the working fluid enters the pump system.
- the first diaphragm 5 has a central portion 54 with a thickness which is greater than the thickness in any point outside the central portion 54.
- a compensation port 26 located in the secondary sub-chamber 22 is intended to provide a fluid communication between the secondary sub-chamber 22 and the inlet port 23, so that the pressure at both sides of the first diaphragm 5 (i.e., in the main and secondary sub-chambers) is similar, and, as mentioned above, only differs due to the differential pressure provided by the first diaphragm movement.
- the secondary sub-chamber is limited between the first diaphragm 5 and a second diaphragm 7.
- This second diaphragm 7 is solidly attached to the first diaphragm 5 by means of a rigid shank 91, so that the first diaphragm 5, the shank 91 and the second diaphragm 5 constitute a single element. Both the first diaphragm 5 and the second diaphragm 7 are clamped to the inner wall of the chamber 2 in two different zones, thus limiting their movements.
- the linear actuator 6 does not need to be isolated from the working fluid, since it is located outside the secondary sub-chamber 22. It contacts the second diaphragm 7 and, since this second diaphragm 7 constitutes a single element with the first diaphragm 5 by the solid attachment with the shank 91, the linear actuator 6 is able to move the first diaphragm 5 without a direct contact.
- Figure 3 shows a cross section of a second embodiment, which has some differences with respect to the first embodiment shown in Figure 2 .
- the chamber 2 is a closed cavity, and is divided into two sub-chambers by the first diaphragm.
- the linear actuator 6 is located inside the secondary sub-chamber 22, inside a protective capsule 92 which isolates the linear actuator 6 from the working fluid which fills the secondary sub-chamber 22. This protective capsule 92 does not prevent the linear actuator 6 from acting over the first diaphragm 5, transmitting the linear reciprocating movement thereto.
- Figures 4a and 4b show a cross section of the volumetric pump 1 of Figure 2 , so that its operation may be observed.
- the embodiment shown in Figure 3 works in the same manner.
- the displacement of the first and second diaphragms 5, 7 has been exaggerated for the sake of understanding the working principle.
- the inlet valve 31 and the outlet valve 32 are arranged to control the flow across the inlet port 23 and the outlet port 24 respectively.
- the linear actuator 6 is arranged to cause an alternating displacement in the single element constituted by the first diaphragm 5, the rigid shank 91 and the second diaphragm 7, at an operation frequency, thus causing a variation in the volume comprised within the main sub-chamber 21, as may be observed in the difference between Figures 4a and 4b .
- the variation of the volume comprised in the main sub-chamber 21 is caused by the elastic deformation of the first diaphragm 5, since the outer edge 53 thereof is clamped to the main chamber 2 and does not displace during this volume variation.
- FIG. 5 shows a detail of the inlet valve 31.
- the outlet valve has an analogue structure. In these figure, the following elements may be observed:
- valves 31 and/or 32 are operated by a secondary piezoelectric actuator instead.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP17382733.8A EP3480460B1 (fr) | 2017-11-02 | 2017-11-02 | Pompe volumétrique |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP17382733.8A EP3480460B1 (fr) | 2017-11-02 | 2017-11-02 | Pompe volumétrique |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3480460A1 true EP3480460A1 (fr) | 2019-05-08 |
EP3480460B1 EP3480460B1 (fr) | 2021-06-23 |
Family
ID=60331539
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17382733.8A Active EP3480460B1 (fr) | 2017-11-02 | 2017-11-02 | Pompe volumétrique |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP3480460B1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113137363A (zh) * | 2021-04-26 | 2021-07-20 | 长春工业大学 | 一种无阀双腔谐振压电驱动式胰岛素泵 |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1395403A (en) * | 1971-09-15 | 1975-05-29 | Becker E | Diaphragm pump having a safety arrangement |
US6345963B1 (en) | 1997-12-16 | 2002-02-12 | Centre National D 'etudes Spatiales (C.N.E.S.) | Pump with positive displacement |
FR2824366A1 (fr) | 2001-03-19 | 2002-11-08 | Shozo Katsukura | Appareil de support pour element mobile et pompe |
WO2005001288A1 (fr) * | 2003-06-25 | 2005-01-06 | Sharp Kabushiki Kaisha | Pompe piezoelectrique et refroidisseur stirling |
US20050238506A1 (en) * | 2002-06-21 | 2005-10-27 | The Charles Stark Draper Laboratory, Inc. | Electromagnetically-actuated microfluidic flow regulators and related applications |
US20090311116A1 (en) * | 2008-06-16 | 2009-12-17 | Gm Global Technology Operations, Inc. | High flow piezoelectric pump |
EP2264317B1 (fr) | 2009-05-28 | 2011-10-26 | Centre National d'Etudes Spatiales ( C.N.E.S.) | Procédé et dispositif d'échange thermique diphasique à pompe à engrenages sur roulements |
EP2930363A1 (fr) * | 2014-04-10 | 2015-10-14 | Stichting Nationaal Lucht- en Ruimtevaart Laboratorium | Pompe piézo-électrique et circuit sous pression doté de celle-ci |
-
2017
- 2017-11-02 EP EP17382733.8A patent/EP3480460B1/fr active Active
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1395403A (en) * | 1971-09-15 | 1975-05-29 | Becker E | Diaphragm pump having a safety arrangement |
US6345963B1 (en) | 1997-12-16 | 2002-02-12 | Centre National D 'etudes Spatiales (C.N.E.S.) | Pump with positive displacement |
FR2824366A1 (fr) | 2001-03-19 | 2002-11-08 | Shozo Katsukura | Appareil de support pour element mobile et pompe |
US20050238506A1 (en) * | 2002-06-21 | 2005-10-27 | The Charles Stark Draper Laboratory, Inc. | Electromagnetically-actuated microfluidic flow regulators and related applications |
WO2005001288A1 (fr) * | 2003-06-25 | 2005-01-06 | Sharp Kabushiki Kaisha | Pompe piezoelectrique et refroidisseur stirling |
US20090311116A1 (en) * | 2008-06-16 | 2009-12-17 | Gm Global Technology Operations, Inc. | High flow piezoelectric pump |
EP2264317B1 (fr) | 2009-05-28 | 2011-10-26 | Centre National d'Etudes Spatiales ( C.N.E.S.) | Procédé et dispositif d'échange thermique diphasique à pompe à engrenages sur roulements |
EP2930363A1 (fr) * | 2014-04-10 | 2015-10-14 | Stichting Nationaal Lucht- en Ruimtevaart Laboratorium | Pompe piézo-électrique et circuit sous pression doté de celle-ci |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113137363A (zh) * | 2021-04-26 | 2021-07-20 | 长春工业大学 | 一种无阀双腔谐振压电驱动式胰岛素泵 |
CN113137363B (zh) * | 2021-04-26 | 2022-03-29 | 长春工业大学 | 一种无阀双腔谐振压电驱动式胰岛素泵 |
Also Published As
Publication number | Publication date |
---|---|
EP3480460B1 (fr) | 2021-06-23 |
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