CN103026066A - System and method for measuring pressure applied by a piezo-electric pump - Google Patents
System and method for measuring pressure applied by a piezo-electric pump Download PDFInfo
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- CN103026066A CN103026066A CN2011800358374A CN201180035837A CN103026066A CN 103026066 A CN103026066 A CN 103026066A CN 2011800358374 A CN2011800358374 A CN 2011800358374A CN 201180035837 A CN201180035837 A CN 201180035837A CN 103026066 A CN103026066 A CN 103026066A
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- 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
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- 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
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
- F04B49/065—Control using electricity and making use of computers
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- 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
- F04B2205/00—Fluid parameters
- F04B2205/03—Pressure in the compression chamber
-
- 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
- F04B2205/00—Fluid parameters
- F04B2205/09—Flow through the pump
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Abstract
A system and method for measuring the pressure provided by a disc pump is disclosed. The disc pump comprises an actuator mounted within the disc pump on a flexible skirt that allows the actuator to oscillate for generating air flow through the cavity of the pump and allows the actuator to be displaced with increasing pressure to a load. The actuator moves from a rest position when air begins flowing through the cavity to a biased position when the load is fully pressurized or depressurized depending on the direction of fluid flow through the cavity. The pump further comprises a sensor which measures the displacement of the actuator at any position between the rest position and the biased position as fluid begins flowing through the cavity to pressurize or depressurize the load. The pressure being delivered by the disc pump is determined as a function of the displacement of the actuator.
Description
The cross reference of related application
The application requires the rights and interests of the U.S. Provisional Application submitted on August 9th, 2010 number 61/371,954, and this provisional application is combined in this by reference.
Background technique
1. invention field
Illustrative embodiment of the present invention relates generally to a pump that is used for fluid, and relate to or rather a pump, wherein the pumping chamber roughly is being oval in shape, has a plurality of end walls and a sidewall and places a actuator between these end walls.Illustrative embodiment of the present invention relates to a kind of disc type pump or rather, and this disc type pump has a valve that is installed in this actuator and/or is installed in an other valve in one of these end walls.
2. description of Related Art
Being created in thermoacoustics and the pump type compressor field of high-amplitude pressure oscillation received significant concern in the enclosed cavity.But the latest development of nonlinear acoustics has allowed to produce the pressure wave with amplitude higher than previous anticipation line amplitude.
Realize that with acoustic resonance it is known carrying out fluid pumping from the entrance and exit of a plurality of restrictions.This can realize that with the oval chamber that at one end is provided with acoustic driver this acoustic driver drives sound standing wave.In this oval chamber, acoustic pressure wave has limited amplitude.Realize the high-amplitude pressure oscillation with a plurality of variable cross sections chamber such as cone, pyramid, bulb, significantly increase thus the pumping effect.In these high-amplitude ripples, be suppressed with the Nonlinear Mechanism of energy dissipation.Yet, not yet the high-amplitude acoustic resonance is used in the disc chamber that wherein inspires recently the radial pressure vibration.The international patent application no PCT/GB2006/001487 that is disclosed as WO2006/111775 has disclosed a kind of substantially pump in disc chamber that has, and this chamber has high aspect ratio, that is, and and the ratio of the radius in this chamber and the height in this chamber.
This pump has a substantially oval-shaped chamber, and this chamber is included in the sidewall that every end place is sealed by a plurality of end walls.This pump also comprises an actuator, and this actuator drives any in these end walls in order to it is vibrated in a direction perpendicular to the surface of this end wall that is driven haply.The space profile of the end wall that this is driven is described as the space profiles of vibrating with cavity fluid pressure and is complementary, and is described as a state of mode coupling at this.When this pump was the mode coupling, in the end wall surface scope that is driven, this actuator institute's work on the inner fluid of chamber constructively increased, and strengthened thus the amplitude of this cavity pressure vibration and transmitted high pump efficiency.The efficient of a mode coupling pump depends on the mating face between the end wall that is driven and sidewall.What wish is the efficient of keeping this pump by constructing this mating face, and like this so that the motion of this end wall that is driven can not reduced or suppress in this mating face, any of amplitude who alleviates thus the cavity fluid pressure vibration reduces.
The actuator of said pump is so that this end wall that is driven carrying out oscillatory movement (" Displacement Oscillation ") perpendicular to this end wall or a direction being parallel to substantially the longitudinal axis of oval chamber substantially, is called " axial oscillation " of end wall in the chamber that is driven hereinafter.The axial oscillation of the end wall that this is driven produces substantially proportional " pressure oscillation " of fluid in the chamber, thereby the radial pressure that forms the distribution that is similar to Bessel function of the first kind distributes, described in the international patent application no PCT/GB2006/001487 that is combined in by reference this, this type of vibration is called " radial oscillation " of hydrodynamic pressure in the chamber hereinafter.The part of the end wall that is driven between this actuator and this sidewall provides a mating face with the sidewall of pump, this mating face reduces the damping of Displacement Oscillation, reduce with any of pressure oscillation who alleviates in the chamber, this part is called (an) " baffle plate " or (a) " baffle plate " hereinafter, as in Application No. 12/477, more definite description in 594, this patent application is combined in this by reference.But the illustrative embodiment of this baffle plate is associated with the periphery of the end wall that mode of operation and this are driven, in order to reduce the damping of Displacement Oscillation.
This class pump also requires for the one or more valves of control by the Fluid Flow in A of pump, and requirement can be with a plurality of valves of high-frequency operation or rather.For multiple application, conventional valve is typically to be lower than the lower frequency work of 500Hz.For example, many conventional compressors are typically with 50 or 60Hz work.Linear resonance compressor well known in the prior art 150 and 350Hz between work.Yet, comprising that many portable electron devices of medical device require for the pump that transmits plus or minus pressure, these pumps are less and relatively quiet so that the treatment of separation is provided during operation dimensionally.In order to realize these purposes, this class pump must be with very high frequency work, thereby require the valve can be with about 20kHz and higher frequency work.For with these high-frequency operation, valve must respond a high frequency oscillation pressure, and this high frequency oscillation pressure can be adjusted in order to form a net flow by the fluid of this pump.
This valve more properly is described among the international patent application no PCT/GB2009/050614, and this patent application is combined in this by reference.Valve can be placed in the first hole or the second hole, or in two holes, to be used for flowing of the fluid of control by this pump.Each valve comprises first valve plate and second valve plate, this first valve plate has a plurality of holes of vertically extending generally and running through it, this second valve plate also has a plurality of holes of vertically extending generally and running through it, wherein these holes of this second valve plate basically with these holes skew of this first valve plate.This valve further comprises a sidewall, this sidewall is placed between this first valve plate and this second valve plate, and wherein this sidewall is closed in order to form a chamber that is communicated with these orifice flow bodies of this first valve plate and this second valve plate between this first valve plate and this second valve plate around the girth of this first valve plate and this second valve plate.This valve further comprises a flap, this flap is placed between this first valve plate and this second valve plate and is movably between the two, and wherein this flap has basically and these holes skews of this first valve plate and a plurality of holes of basically aliging with these holes of this second valve plate.In response to a change on the direction of the pressure reduction of the fluid that passes this valve, this flap is pushed between this first valve plate and this second valve plate.
The invention summary
In order to solve measurement and the control problem of the tissue therapy system that may comprise a disc type pump or Micropump, the pressure that can utilize principle of the present invention to measure to be produced by this disc type pump is in order to more effectively and economically control the work of this disc type pump.This disc type pump comprises an actuator, and this actuator is a chamber internal vibration, thereby provides a decompression in order to produce a radial pressure ripple, to be used for being applied to a load as indicated above or tissue site.Can measure with one or more sensors the displacement of this actuator.In response to the displacement of measuring of this actuator, can measure the pressure that is produced by this disc type pump for this tissue site.The driving signal that can regulate this actuator come control work and, thereby control the displacement of this actuator in order to reach a desirable pressure in this tissue site.
An embodiment of disc type pump comprises shell, baffle plate, actuator, sensor and the electronic circuit of a disc type pump.This baffle plate is fixed on the shell of this disc type pump in order to support this actuator, and can be enough flexible to allow any material of this actuator vibration.This actuator and this baffle-panels to a relative base plate in order in this disc type pump, form a chamber that wherein produces the radial pressure ripple.This actuator can have a first surface and a second surface and directly or indirectly be connected on this baffle plate.This sensor can be placed in outside this chamber in case this actuator of sensing with respect to a position of the shell of this disc type pump, this position is corresponding to the pressure that provides.This actuator calculated the pressure that this disc type pump provides with respect to a function of the position of the shell of this disc type pump when electronic circuit can communicate with this sensor and be configured to be activated according to this actuator.
In another embodiment, a pump housing comprises a substantially sidewall of elliptical shape, this sidewall is at one end sealed by a pair of inner panel in order to be formed for containing a chamber of fluid in the described pump housing by a diapire sealing and at the other end, and wherein first inner panel adjacent with this chamber comprises a core and a periphery in these inner panels.This pump further comprises an actuator that is formed by these end plates, wherein but second inner panel in these inner panels is associated with the core of this first inner panel with mode of operation in order to cause a vibration displacement motion in response to one on the described actuator that is applied in the use drives signal, and a plurality of radial pressures that produce thus fluid in this chamber are vibrated.This pump also comprises a baffle plate, and this baffle plate is connected between the periphery of this sidewall and this first inner panel flexibly in order to promote this vibration displacement motion.This pump also comprises first hole and second hole, and this first hole extends through described actuator so that fluid can flow through this chamber, and this second hole extends through diapire so that fluid can flow through this chamber.Valve is placed in in described the first hole and described the second hole at least one, and be adapted to and when fluid begins to flow through this chamber, allow fluid to flow through this chamber in order to be a load pressurization or decompression in direction of cardinal principle, thereby so that described actuator is shifted to this diapire because of the increase of pressure and the deflection of baffle plate, namely move to an offset position from a position of rest.This pump further comprises a sensor that is installed in outside this chamber, this sensor is in a fixed position with respect to the described pump housing, begins to flow through this chamber so that the displacement of any position of described actuator between this position of rest and this offset position for the load pressurization or when reducing pressure be used for to measure at fluid.
A kind of method for control disc type pump comprises with a driving signal and drives a actuator in a shell of a disc type pump.This actuator is installed within this disc type pump by the baffle plate of this flexibility.Owing to this actuator response is vibrated in driving signal, thus the pressure that forms in load increase, and air-flow is kept to stall conditions from free-flowing.When pressure forces this actuator to leave position of rest, since this baffle plate along with this actuator together from the fixed position of this actuator towards the offset position deflection, so can measure by this disc type pump and the pressure that load, forms gradually from a position of rest a to function of the displacement of an offset position that is in stall conditions that is in free-flowing according to actuator by a sensor.Because this actuator produces a plurality of radial pressure ripples in the chamber of this disc type pump, thus this sensor preferably be placed in outside the chamber of this disc type pump, like this so that this sensor can not interfere with the work of this disc type pump self.
In other purposes, the feature and advantage of this disclosure embodiment, and these other purposes, feature and advantage will become obvious by consulting the following drawings and describing in detail.
Brief Description Of Drawings
Hereinafter consult accompanying drawing and describe illustrative embodiment of the present invention in detail, these accompanying drawings be combined in by reference this and wherein:
Figure 1A is the schematic sectional view that is shown as first a disc type pump of an actuator that is in a position of rest according to having of the first illustrative embodiment;
Figure 1B is the schematic sectional view that is in the first disc type pump of an offset position according to the displaying actuator of the first illustrative embodiment;
Fig. 2 A is the figure for the axial displacement vibration of the basic mode of flexural vibration of the actuator of this first disc type pump;
Fig. 2 B is in response to the mode of flexural vibration shown in Fig. 2 A, the figure of the pressure oscillation of the fluid in the chamber of this first disc type pump;
Fig. 3 is the zoomed-in view according to the first sensor of the displacement of the actuator that is used for this first disc type pump of measurement of the first illustrative embodiment;
Fig. 4 is the schematic representation of the illustrative receiver of this first sensor, has indicated the position when this actuator is in position of rest and offset position;
Fig. 5 is the schematic sectional view with the disc type pump that is shown as the actuator that is in offset position, and this figure comprises the zoomed-in view according to the second sensor of the displacement that is used for this actuator of measurement of the second illustrative embodiment;
Fig. 6 is the 3rd an illustrative sensor that comprises the displacement that is used for measurement disc type pump actuator of a diffraction grating;
Fig. 7 is the 4th an illustrative sensor that comprises the displacement that is used for measurement disc type pump actuator of a magnetic element;
Fig. 8 is the block diagram that is used for measuring and controlling an illustrative circuit of a decompression that is produced by this disc type pump of a disc type pump; And
Fig. 9 is for the flow chart of control by an illustrative method of the pressure of a disc type pump generation.
Detailed description of preferred embodiments
Figure 1A and 1B are the explanations according to the sectional view of an illustrative disc type pump 100 of illustrative embodiment.As shown in the figure, this disc type pump 100 can comprise a pump casing 102, this pump casing has an oval-shaped shape of cardinal principle, this elliptical shape comprises at one end passes through the elliptical wall 101 that supporting leg 105 is installed by 103 sealings of a diapire and at the other end, and these supporting legs are attached on a circuit board 108 or other substrates in order to support pump casing 102.Elliptical wall 101, supporting leg 105 and diapire 103 form pump casing 102 together.Pump 100 further comprises by a ring baffle 130 on the elliptical wall 101 that is attached to the pump housing and is supported on pair of discs shape inner panel 114,115 in the pump 100.The internal surface of elliptical wall 101, diapire 103, inner panel 114 and ring baffle 130 is in chamber 116 of pump 100 interior formation.These internal surfaces in chamber 116 are included as the sidewall 118 of a first portion of the internal surface of elliptical wall 101, this sidewall is at one end sealed by end wall 120, and wherein end wall 120 is the internal surface of end plate 103 and internal surface that end wall 122 comprises inner panel 114 and first side of baffle plate 130.Therefore, end wall 122 comprises a core corresponding to the internal surface of inner panel 114, and corresponding to a periphery of the internal surface of ring baffle 130.
Although pump 100 with and parts be oval in shape substantially, specific embodiments disclosed here is a circle, elliptical shape.In the embodiment shown in Figure 1A and the 1B, it is a frusto-conical surface that end wall 120 is shown as, but also can be substantially the plane and parallel with end wall 122.The diapire 103 of this pump housing and elliptical wall 101 can be formed by the rigid material of any appropriate, and this rigid material includes but not limited to metal, pottery, glass or plastics, and these plastics include but not limited to the plastics of molding and forming.
The inner panel 114,115 of pump 100 forms an actuator 140 together, but this actuator is associated take the core of mode of operation with the end wall 122 of one of these internal surfaces of 116 as the chamber.Must be formed by a kind of piezoelectric material one of in the inner panel 114,115, this piezoelectric material can comprise any electroactive material that shows stress in response to an electrical signal that applies, for example as a kind of electrostriction or magnetostriction materials.In a preferred embodiment, for example, inner panel 115 is that the piezoelectric material that is shown stress by the electrical signal that applies in response to forms, that is, and and active inner panel.Another inner panel preferably has and the similar flexural rigidity of this activity inner panel in the inner panel 114,115, and can be by a kind of piezoelectric material or a kind of electric inert material such as a kind of metal or ceramic formation.In this preferred embodiment, inner panel 114 has and this activity inner panel 115 similar flexural rigidityes, and by a kind of electric inert material such as a kind of metal or ceramic formation, that is, and the inertia inner panel.When this activity inner panel 115 is excited by electric current, this activity inner panel 115 is with respect to a radial direction expansion of the longitudinal axis in chamber 116 and shrink, thereby so that inner panel 114,115 bendings, the end wall 122 that makes thus their correspondences axial deflection (consulting Fig. 2 A) on substantially perpendicular to the direction of end wall 12.
In unshowned other embodiments, depend on specific design and the orientation of pump 100, baffle plate 130 can support any (no matter being activity or inertia inner panel) the inner panel 114,115 from top or lower surface.In another embodiment, actuator 140 can by with inner panel 114,115 in one of only have a power transmission relation a device substituted, for example as, mechanical device, magnetic devices or electrostatic equipment, wherein this inner panel can be formed an electric inertia or electric passive material layer, and this material layer is driven in the mode identical with aforesaid way by this class device (not shown) and enters oscillatory regime.
The size in chamber 116 described here should preferably satisfy with respect to the height (h) in chamber 116 and some inequality the relation between the radius (r), and this radius r is that the longitudinal axis in chamber 116 is to the distance of sidewall 118.These inequality are as follows:
R/h〉1.2; And
h
2/ r〉4 * 10
-10Rice.
In one embodiment of the invention, when the fluid in chamber 116 was a kind of gas, the ratio (r/h) of chamber radius and chamber height was between about 10 and about 50.In this example, the volume in chamber 116 can be less than about 10ml.In addition, under working fluid is situation with the diametrically opposite a kind of gas of a kind of liquid, h
2The ratio of/r is preferably about 10
-6With about 10
-7In the scope between the rice.
In addition, chamber 116 disclosed here should preferably be satisfied relevant with frequency of okperation (f) with chamber radius (r) with lower inequality, and this frequency of okperation is that actuator 140 vibrations are in order to produce the frequency of the axial displacement of end wall 122.This inequality formula is as follows:
[formula 1]
The velocity of sound (c) of its lumen 116 interior working fluids can be the low speed (c at an about 115m/s
s) with one equal about 1, the quick (c of 970m/s
f) between scope, expressed such as above-mentioned equation, and k
0A constant (k
0=3.83).Approximate in the chamber 116 the radially lowest resonance frequency of pressure oscillation the calibration of the oscillatory movement of actuator 140, but can this value 20% within.In the chamber 116 radially the lowest resonance frequency of pressure oscillation be preferably more than about 500Hz.
Although preferably chamber 116 disclosed here should be satisfied these inequality of above determining respectively, the relative size in chamber 116 should not be limited to the chamber with equal height and radius.For example, chamber 116 can have the slightly different shape that requirement forms different radii or the height of different frequency response, like this to resonate in a kind of mode of hope in chamber 116 export in order to produce the best of self-pumping 100.
At work, pump 100 can think a load (not shown) pressurization or think a load 150 decompressions as adjacent with intake valve 128 negative pressure or Reduced pressure source as a positive pressure source adjacent with expulsion valve 132, as by the diagram of arrow institute.The entrance of shown pump 100 is communicated with load 150 fluids, like this so that pump 100 as adjacent with intake valve 128 negative pressure or Reduced pressure source.Load 150 can be a tissue therapy system utilizing negative pressure to treat.Term " decompression " is often referred to a pressure less than the external pressure of pump 100 present positions as used herein.Although term " vacuum " and " negative pressure " can be used for describing decompression, actual pressure reduces and may reduce less than the pressure that usually is associated with absolute vacuum significantly.With regard to pressure was gauge pressure, this pressure was " negative value ", that is, this pressure is lowered under the ambient atmosphere pressure.Unless otherwise indicated, otherwise in the force value of this statement be manometer pressure.Typically refer to reducing of absolute pressure about increasing decompression, and reduce the increase that decompression typically refers to absolute pressure.
Fig. 2 A shows a kind of possible displacement profile that the axial oscillation to the end wall that is driven 122 in chamber 116 describes.Full curve and arrow are illustrated on the time point, the displacement of the end wall 122 that is driven, and dash curve is illustrated in after the half cycles displacement of the end wall 122 that is driven.Displacement shown in this figure and other each figure all is exaggerated.Because actuator 140 not by on the circumference that is installed in rigidly oneself, hangs but pass through ring baffle 130, so actuator 140 can be freely with the center of mass vibration of its basic mode around oneself.In this basic mode, the Displacement Oscillation amplitude of actuator 140 is substantially zero at annular displacement node 42 places, and this annular displacement node is between the center and sidewall 118 of the end wall 122 that is driven.Other each point places on end wall 122, the amplitude of these Displacement Oscillation is greater than zero, shown in vertical arrow.A center displacement antinode 43 is present near the center of actuator 140, and a peripheral displacement antinode 43' is present near the circumference of actuator 140.After half cycles, the center displacement antinode 43 is represented by dash curve.
Fig. 2 B shows a kind of possible pressure oscillation profile, and this profile has illustrated the pressure oscillation that causes because of the vibration of the axial displacement shown in Fig. 2 A in chamber 116.Full curve and arrow are illustrated in the pressure on the time point.In this mode with more in the high order mode, the amplitude of these pressure oscillations has a peripheral pressure antinode 45' near having a center pressure antinode 45 and the sidewall 118 in chamber 116 near the center in chamber 116.Annular pressure node 44 places between center pressure antinode 45 and peripheral pressure antinode 45', the amplitude of these pressure oscillations is substantially zero.Simultaneously, the amplitude of the pressure oscillation that is illustrated by the broken lines has a negative center pressure antinode 47 and a peripheral pressure antinode 47 ' near the center in chamber 116, and has identical annular pressure node 44.For an oval chamber, the Radial correlation of the amplitude of pressure oscillation can be similar to first kind Bessel function in the chamber 116.Above-mentioned pressure oscillation results from moving radially of fluid in the chamber 116, and therefore will be called as " the radial pressure vibration " of the fluid in the chamber 116, vibrates in order to be different from the axial displacement of actuator 140.
Further consult Fig. 2 A and Fig. 2 B can find out, the radially dependence of the axial displacement oscillation amplitude of actuator 140 (" Mode Shape " of actuator 140) is similar to Bessel function of the first kind, thus with chamber 116 in the tightr coupling of radially dependence (" Mode Shape " of pressure oscillation) of oscillation amplitude of desired pressure.Also can be with other symmetrical and asymmetry fuction produce the interior pressure oscillation in chamber 116.Under any circumstance, by actuator 140 not being installed in rigidly the circumference place of oneself and allowing this actuator more freely to vibrate around the center of mass of oneself, the Mode Shape of Displacement Oscillation substantially with chamber 116 in the Mode Shape of pressure oscillation be complementary, thereby realize the Mode Shape coupling, perhaps, more briefly, mode coupling.Although with regard to this respect, the mode coupling may not be always perfect, but the axial displacement vibration of actuator 140 and chamber 116 interior corresponding pressure oscillations are striden the whole surface of actuator 140 and are had identical substantially relative phase, and the radial position of the annular pressure node 44 of the pressure oscillation in its lumen 116 conforms to substantially with the radial position of the annular displacement node 42 of the axial displacement vibration of actuator 140.
Along with actuator 140 around own center of mass's vibration, when actuator 140 with Fig. 2 A in the graphic basic mode of flexural vibration of institute when vibrating, the radial position of annular displacement node 42 will be positioned within the radius of actuator 140 inevitably.Therefore, conform to the radius (r of actuator with annular pressure node 44 in order to ensure annular displacement node 42
Act) should be preferably more than the radius of annular pressure node 44, thus the mode coupling is optimized.Suppose that again the pressure oscillation in the chamber 116 is similar to Bessel function of the first kind, then the radius of annular pressure node 44 will be from the center of end wall 122 to the radius of sidewall 118, that is, and and about 0.63 times of the radius in chamber 116 (" r ").Therefore, the radius (r of actuator 140
Act) should preferably satisfy with lower inequality: r
Act〉=0.63r.
Owing to actuator 140 vibrates in response to driving signal, thus the pressure that air-flow forms the load 150 when free-flowing is kept to stall conditions increase.When pressure forces actuator 140 to leave position of rest, since baffle plate 130 along with actuator 140 together from the fixed position deflection of this actuator of sidewall 101 to offset position 138, so can measure by disc type pump 100 load 150 the gradually pressure of formation according to a function of the displacement (δ y) of actuator 140 from the position of rest 136 that is in free-flowing as Figure 1A as shown in to the offset position 138 that is in stall conditions as shown in Figure 1B by a sensor.Because actuator 140 is at a plurality of radial pressure ripples of the chamber of disc type pump 100 116 interior generations, thus this sensor preferably be placed in outside the chamber 116 of disc type pump 100, like this so that this sensor can not interfere with the work of disc type pump 100.
Fig. 3 is mounted on the circuit board 108 with towards actuator 140 and measure the zoomed-in view of a sensor 331 of displacement of the actuator 140 of disc type pump 100.Sensor 331 is included in optical launcher 332 and the optical receiver 334 that uses in the process of the displacement 130 of measuring actuator 140.It can be an optical signalling 335 of the light wave in visible spectrum or the invisible spectrum that optical launcher 332 is propagated.Optical signalling 335 is reflected from the surface of the inner panel 115 of actuator 140, like this so that the signal that is reflected received by optical receiver 334, and no matter the displacement (δ y) of actuator 140 as shown in Figure 4.When actuator 140 was in the position of rest 136, the first signal that is reflected 340 impacted optical receiver 334 in the position shown in Fig. 3 and Fig. 4.When actuator 140 was displaced to offset position 138 from position of rest 136, the first signal that is reflected 340 depended on the displacement (δ y) of actuator 140 and the displacement that is reflected accordingly (δ x) that correspondingly is shifted becomes the second signal that is reflected 342.Basically, the route from position of rest 136 to complete offset position 138 is followed in the mapping of the signal that is reflected of impact optical receiver 334, as shown in Figure 4.The displacement (δ y) of the displacement that is reflected (δ x) and actuator 140 is proportional, and the displacement of this actuator is a function of the pressure that provided by disc type pump 100, and is as indicated above.
In one embodiment, optical launcher 332 can be laser, light emitting diode (LED), vertical cavity surface emitting laser (VCSEL) or light-emitting component.Optical launcher 332 can be placed on the circuit board 108 and to this optical launcher and carry out orientation in order to make optical signalling 335 from any point reflection of the inner panel 115 of actuator 140, as long as the first signal that is reflected 340 and the second signal that is reflected 342 are still received and measure by optical sensor 334.Yet, actuator 140 produce with the vibration of basic mode as described in Fig. 2 A and shown in air-flow the time, the amplitude of the Displacement Oscillation of actuator 140 can be zero substantially at any annular displacement node 42 places that produce.Therefore, along the amplitude of the Displacement Oscillation at other each point places of actuator 140 all greater than zero, equally as described.Therefore, optical launcher 332 should be placed and be oriented so that optical signalling 335 is to be reflected from a position near annular displacement node 42, in order to minimize the effect of the high frequency oscillation of actuator 140, and when actuator 140 moves to offset position 138 from position of rest 136 more lentamente, measure more exactly the displacement (δ y) of this actuator.
In one embodiment, optical sensor 334 can comprise a plurality of pixels that form sensor array.Optical sensor 334 can be configured to one or more positions that are reflected light beam that sensing is in one or more wavelength.Therefore, optical receiver 334 can be configured to the displacement that be reflected (δ x) of sensing between the first signal that is reflected 340 and the second signal that is reflected 342.Optical receiver 334 can be configured to by these corresponding pixels of optical receiver 334 signal that is reflected 340 and 342 that optical receiver 334 senses be changed into electrical signal.Can measure in real time or calculate the displacement (δ x) that is reflected or utilize a specific sample frequency to measure actuator 140 with respect to the position of pump casing 102.In one embodiment, the position of actuator 140 is calculated as an average or average position within a given period.Can determine the pixel size of optical receiver 334 so that the displacement (δ y) that provides other receptance to detect the less of actuator 140, thereby monitor better the pressure that disc type pump 100 provides, like this so that this pressure can be controlled in real time.
Can utilize according to principle of the present invention the multiple replacing method of the displacement of calculating actuator 140.It should be understood that the determining displacement that can come with respect to the element of any other fixed position in the pump casing 102 finish actuator 140.Although usually proportional substantially, but the displacement that is reflected (δ x) can equal the displacement (δ y) of actuator 140 multiply by a scale factor, wherein this scale factor can be based on disc type pump 100 pump casing 102 configuration predetermined value or a plurality of other the alignment factors.Therefore, can measure decompression in the chamber 116 of disc type pump 100 by the displacement (δ y) of sensing actuator 140, and do not need a plurality of pressure transducers, these pressure transducers are directly measured the pressure that is provided in the load, but in depressurized system for example, too heavy and expensive for measuring by the pressure that disc type pump 100 provides.These illustrative embodiment have been optimized the space utilization in the pump casing 102 in the situation of the pressure oscillation of the chamber 116 interior generations that can not interfere with disc type pump 100.
Fig. 5 is another schematic sectional view of showing the disc type pump 100 of the actuator 140 that is in offset position 138, and this figure comprises the zoomed-in view according to another sensor of the displacement that is used for measurement actuator 140 of another illustrative embodiment.This sensor is a ultrasonic transmitter-receiver 546, and this ultrasonic transmitter-receiver emission ultrasound 548 is so that based on the position of being reflected and measured by the ultrasound 548 that ultrasonic transmitter-receiver 546 receives actuator 140 by actuator 140.For simplicity's sake, the ultrasound of ultrasonic transmitter-receiver 546 is got back in not shown echo.This ultrasonic transmitter-receiver 546 can will send to one or more electronic equipments about the original measurement result of the displacement (δ y) of actuator 140 or the data of processing, and these electronic equipments comprise that for example a processor is to measure decompression and other operating characteristics that is produced by this pump 100.
About Fig. 6, show a diffraction grating 602 for the displacement (δ y) of measuring disc type pump 100 actuators 140.Diffraction grating 602 can be attached on the actuator 140 or by mutually integrated with this actuator.For example, diffraction grating 602 can be to be attached to a reflective optical element on the actuator 140 with tackiness agent or other fastener meanses in the manufacture process of disc type pump.As shown in the figure, a transmitter 607 is transmitted into a multispectral optical signalling 608 on the diffraction grating 602.Diffraction grating 602 is diffracted into some light beam λ 1, λ 2, λ 3 and the λ 4 with different wave length with this multispectral optical signalling 608.Detect the wavelength of light beam λ 1, λ 2, λ 3 and λ 4 by a sensor array 610.In one embodiment, this sensor array 610 can comprise a plurality of pixels 612,614,616 and 618.These pixels 612,614,616 and 618 of sensor array 610 also can be called as a pel array.Alternately, sensor array 610 can be a single sensor or pixel element such as pixel 614.Transmitter 607 and sensor array 610 can be connected to the element of any other fixed position of circuit board 108 or pump casing 102 in order to guarantee the stability of duration of work.
At work, transmitter 607 can be a luminescent circuit or element, and this luminescent circuit or element are transmitted into the multispectral optical signalling 608 of multispectral optical signalling form on this diffraction grating.Diffraction grating 602 can be an optical component of normal mode, and this optical component becomes the optical diffraction of multispectral optical signalling 608 some light beam λ 1, λ 2, λ 3 and λ 4 and reflects these light beams in different directions, as shown in Figure 6.As known in the art, diffraction grating 602 can comprise interior groove or the groove of grating of diffraction grating, and these grooves or groove are configured to during the displacement of normal operation and actuator 140 λ 1, λ 2, λ 3 and λ 4 are spread out on the sensor array 610.
About Fig. 7, show a magnetic sensor 702 for the displacement (δ y) of the actuator 140 of measuring disc type pump 100.The magnetic sensor 702 that can be a Hall effect (Hall Effect) sensor or similar sensor is installed on circuit board 108 or the pump casing 102.A conductor 706 can be installed on the actuator 140.Conductor 706 can be other conductors that magnetic induction maybe can be provided by magnetic sensor 702 metal, magnetic.The magnetic field 710 that magnetic sensor 702 is measured between magnetic sensor 702 and conductor 706.Magnetic sensor 702 can be calibrated or be configured to measure the electric field that is changing that forms magnetic field 710 so as to be determined at magnetic sensor 702 and conductor 706 between displacement.
Consult Fig. 8, show the block diagram of an illustrative disc type pumping system 800, this system comprises the disc type pump 100 that disc type pump is as indicated above and is used for measuring and sensor such as the optical sensor 331 of a pressure that control is produced by disc type pump 100 that this optical sensor comprises optical launcher 332 and optical receiver 334.It should be understood that other sensors as indicated above also can be as the part of disc type pumping system 800.Disc type pumping system 800 also comprises a battery 802 that is used to 800 power supplies of disc type pumping system.These elements of disc type pumping system 800 be interconnection and communicate by wire, path, track, helical pitch and other conducting elements.Disc type pumping system 800 can also comprise a processor 804 and a driver 808, and wherein processor 804 is adapted to driver 808 and communicates by letter, and comprises a control signal 806 is conveyed to driver 808.Driver 808 generations excite one of the actuator 140 as indicated above of an actuator in the disc type pump 100 to drive signal 810.Actuator 140 can comprise a piezoelectric part, and this piezoelectric part produces the radial pressure vibration of fluid in the chamber of disc type pump 100 when being excited, thereby causes that Fluid Flow in A passes this chamber so that as indicated above for the load pressurization or reduce pressure.Processor 804 can be configured to illumination sign 812 is offered optical launcher 332, to be used for illuminating actuator 140 by a light beam such as light beam 335, this light beam is reflexed on the optical receiver 334 by actuator 140, such as the signal that is reflected 340 by above also having described, 342 illustrated.When these signals that are reflected 340,342 impact optical receiver 334, optical receiver 334 will offer processor 804 corresponding to a displacement signal 814 of the displacement (δ y) of actuator 140.Processor 804 is configured to calculate the pressure that this load place produces by pump 100 according to a function of the displacement (δ y) of the actuator 140 that is represented by displacement signal 814.In one embodiment, processor 804 can be configured to divide equally a plurality of signals that are reflected 340,342 in order to measure actuator 130 along with the average displacement of time history.In another embodiment again, processor 804 can be with displacement signal 814 as feedback in order to regulate control signal 806 and the corresponding signal 810 that drives, to be used for being adjusted in the pressure of this load place.
Other control circuits of processor 804, driver 808 and disc type pumping system 800 can be called as an electronic circuit.Processor 804 can be to be endowed functional circuit or the logic that can control disc type pump 100.Other devices that processor 804 can be used as or comprise microprocessor, DSP digital signal processor, specific integrated circuit (ASIC), central processing unit, digital logic or be suitable for controlling electronic equipment, conversion and processing signals and information and carry out other inter-related tasks, this electronic equipment comprises one or more hardware and software elements, executive software, instruction, program and application.Processor 804 can be an one chip calculated with other or communication element mutually integrated.In one embodiment, processor 804 can comprise a storage or communicate with a storage.This storage can be configured to store data be used for subsequently retrieval or hardware element, device or a recording medium of access after a while.This storage can be static state or the dynamic memory of the storage medium form of random access memory, buffer memory or be suitable for other miniaturizations of storing data, instruction and information.In an alternate embodiment, this electronic circuit can be analog circut, and this analog circut is configured to carry out same or similar functional displacement for actuator 140 in the chamber of measuring pressure and control disc type pump 100, and is as indicated above.
Disc type pumping system 800 can also comprise a RF transceiver 820, the wireless signal 822 that this RF transceiver is used for launching and receiving via RF transceiver 820 is passed on information and the data relevant with the performance of disc type pumping system 800 with 824, comprises the actual displacement (δ y) of for example current pressure measurements, actuator 140 and the current working life of battery 802.RF transceiver 820 can be a communication interface, and this communication interface utilizes wireless, infrared rays or other wired or wireless signals to come to communicate with one or more external meanss.RF transceiver 820 can utilize bluetooth, WiFi, WiMAX or multiple other communication standards or proprietary communication system.About more specifically using, RF transceiver 820 can send to these signals 822 computing device, and this computing device has been stored the database of a pressure reading and consulted for the medical profession.This computing device can be can carry out local process or in addition information is conveyed to for the treatment of central authorities of information and data or computer, shifter or a medical device means of remote computer.Similarly, RF transceiver 820 can receive signal 824 so that the pressure that comes outside adjusting to be produced in load place by disc type pump 100 based on the motion of actuator 140.
Driver 808 is circuit that excite and control actuator 140.For example, driver 808 can be for generation of high power transistor (GTR), amplifier, bridge and/or a filter as the concrete waveform of the part that drives signal 810.This waveform can be configured in order to provide one to drive signal 810 by processor 804 and driver 806, and this driving signal makes actuator 140 carry out the vibration of oscillatory movement form with frequency (f), describes in more detail as mentioned.Drive signal 810 in response to this, the vibration displacement motion of actuator 140 produces the radial pressure vibration of fluid in the chamber of pump 100, thereby produces pressure in load place.
In another embodiment, disc type pumping system 800 can comprise for a user interface that shows information to the user.This user interface can comprise for a display device, audio interface or tactile interface that information, data or signal are provided to the user.For example, a compact LED screen can show by disc type pump 100 applied pressures.This user interface can also comprise button, regulation and control dish, knob or be used for regulating the disc type pump performance and other electronics or the mechanical interface of the decompression that particularly produces.For example, can increase or reduce pressure by adjusting knob or as user interface other control units partly.
Also disclosed a kind of for measuring by the method for pump to the pressure of load generation at this.This pump comprises an actuator on the flexible baffle that is installed in this pump, and this flexible baffle forms a chamber in this pump.This flexible baffle allows this actuator vibration in order to produce the air-flow in the chamber of passing this pump and allow this actuator to be subjected to displacement because the pressure to load increases.The method comprises that electricity drives this actuator and moves to cause the vibration displacement of actuator in pump, thus the radial pressure vibration that in this chamber, produces fluid.The method is included in further that fluid begins to flow through this chamber so that actuator increases the displacement of measuring this actuator when a position of rest moves to an offset position because of the pressure of load place, and wherein the pressure of this load place flexibility that is increased in baffle plate is accepted in the scope.The method also comprises the pressure that calculates this load place based on the displacement of this actuator.
More properly consult Fig. 9, show for the flow chart of measuring and control an illustrative method 900 of the pressure that is produced by the disc type pump.Method 900 originates in step 902, and wherein an actuator in the shell of disc type pump can be by a drive.This actuator can be driven by a piezoelectric actuator or device.Can drive this actuator produces be used to the decompression that is applied to a tissue site.For example, this disc type pump can be directly or indirectly be communicated with by applying the tissue site that towel covers, such as in related domain understanding.In step 904, can be when actuator moves to an offset position because the pressure in the load increases from a position of rest displacement of this actuator of sensing.In one embodiment, when this disc type pump is deactivated or cuts off the power supply, this position of rest occurs, and the pressure in load reaches this offset position when being in maximum value.The corresponding pressure of the displacement of actuator and load place changes between these two positions.Drive signal and can dispose, be shaped by the control logic of processor, driver or this disc type pump or otherwise produce, with the work that is used for this actuator of control and be applied to corresponding pressure in this load.
In step 906, can measure the pressure that is produced by this disc type pump according to a function of the actuator displacement that senses.In one embodiment, can measure this displacement by the shell of this disc type pump and reflection or the refraction of an optical signalling between this actuator.Similarly, can utilize ultrasound, radio frequency, magnetic or other optical sensors or transmitter and receiver corporation to measure the displacement of this actuator.The pressure that the displacement of this actuator can indicate this disc type pump that load is produced.Can based on load known difference, coefficient, loss and other features of (as comprising that this disc type pump is as a tissue therapy system of parts), utilize numeral and/or analog electronics to measure the pressure that is applied to tissue site.These electronics can utilize the static state of any number or dynamic algorithm, function or sensing measurement result to measure this pressure.In step 908, drive signal so that the displacement of control actuator in response to measuring the pressure that is transmitted by this disc type pump, regulating.In response to the measurement result of the feedback signal that receives from one or more sensors of measuring this actuator displacement, can produce this driving signal.In one embodiment, can increase the amplitude of this driving signal in order to increase the decompression that is produced and be communicated to accordingly tissue site by the disc type pump.Similarly, can revise the amplitude of this driving signal or shape in order to drive the pressure that the actuator of this disc type pump reduces or keep load place.
These illustrative embodiment provide a low-cost system that is used for coming by the data that a sensor of understanding by a disc type pump provides the pressure that this disc type pump of indirect monitoring produces, this sensor an actuator when a position of rest moves to an offset position, measure this actuator with respect to this disc type pump in the displacement of parts of a plurality of fixed positions.It should be understood that this sensor or its any parts (such as the optical launcher of optical sensor) can be connected directly on this actuator to be used for measuring this displacement by any other fixed position catoptrics signal on pump casing or this disc type pump.These illustrative embodiment have reduced equipment, space and the cost of monitoring the pressure that is produced by this disc type pump, in addition can utilize the direct sensing pump at traditional pressure transducer and the monitor of the pressure of load place generation.
It is for one that implements minority embodiment of the present invention that preamble describes in detail, and is not intended to be restricted in scope.Those skilled in the art will expect immediately at other field but not be used for implementing method of the present invention and variant in those fields of above-detailed.Following claim is established for the of the present invention many embodiments that disclose with larger particularity.
Claims (43)
1. pump comprises:
A pump housing, this pump housing has a substantially sidewall of elliptical shape, this sidewall is at one end sealed by a pair of inner panel in order to be formed for containing an a kind of chamber of fluid in the described pump housing by a diapire sealing and the other end, and wherein first inner panel adjacent with this chamber comprises a core and a periphery in these inner panels;
An actuator that is formed by these end plates, wherein but second inner panel in these inner panels is associated with this core of this first inner panel with mode of operation in order to cause a vibration displacement motion in response to one on the described actuator that is applied in the use drives signal, and a plurality of radial pressures that produce thus this fluid in this chamber are vibrated;
A baffle plate, this baffle plate are connected between this periphery of this sidewall and this first inner panel flexibly in order to promote this vibration displacement motion;
First hole, this first hole extend through described actuator in order to make fluid can flow through this chamber;
Second hole, this second hole extend through this diapire in order to make fluid can flow through this chamber;
A valve, this valve is placed in in described the first hole and the second hole at least one, and be adapted to and when fluid begins to flow through this chamber, allow this fluid to flow through this chamber in order to be a load pressurization or decompression in direction substantially, thus so that described actuator because of the deflection of the increase of pressure and this baffle plate from position of rest to an offset position shift to this diapire; And
Be installed in a sensor outside this chamber, this sensor is in a fixed position with respect to the described pump housing, be used for to measure at fluid to begin to flow through this chamber so that the displacement of any position of described actuator between this position of rest and this offset position for this load pressurization or when reducing pressure.
2. pump as claimed in claim 1, the radius (r) that wherein extends to this chamber of this sidewall from the longitudinal axis in this chamber and the ratio of the height (h) of this sidewall in this chamber are more than or equal to 1.2.
3. pump as claimed in claim 2, wherein this radius (r) in this height (h) in this chamber and this chamber further is associated by following formula: h
2/ r〉4 * 10
-10Rice.
4. pump as claimed in claim 2, wherein said actuator drive this first inner panel associated with it in order to cause oscillatory movement with a frequency (f).
5. pump as claimed in claim 4, wherein said actuator drive this first inner panel to cause this vibration displacement motion, and wherein this radius (r) is associated with this frequency (f) by following formula:
C wherein
s≈ 115m/s,
c
r≈ 1970m/s, and
k
0=3.83。
6. pump as claimed in claim 4, wherein the lowest resonance frequency of these radial pressures vibrations is greater than about 500Hz.
7. pump as claimed in claim 4, wherein this frequency (f) is approximately equal to the lowest resonance frequency of these radial pressures vibrations.
8. pump as claimed in claim 4, wherein this frequency (f) the lowest resonance frequency of these radial pressures vibrations 20% within.
9. pump as claimed in claim 1, wherein the motion of the vibration displacement of this first inner panel on Mode Shape with these radial pressure oscillating phases couplings.
10. pump as claimed in claim 1, wherein said baffle plate is a flexible membrane.
11. pump as claimed in claim 10, wherein this flexible membrane is formed by plastics.
12. pump as claimed in claim 11, wherein the Ring Width of flexible membrane be about 0.5 and 1.0mm between and the thickness of this flexible membrane less than about 200 microns.
13. pump as claimed in claim 10, wherein this flexible membrane is formed by metal.
14. pump as claimed in claim 13, wherein this Ring Width of flexible membrane be about 0.5 and 1.0mm between and this thickness of this flexible membrane less than about 20 microns.
15. pump as claimed in claim 2, wherein when this fluid that uses in this chamber was a kind of gas, this ratio was between about 10 and about 50.
16. pump as claimed in claim 2, wherein the volume in this chamber is less than about 10ml.
17. pump as claimed in claim 2, the radius of wherein said actuator is more than or equal to 0.63(r).
18. pump as claimed in claim 17, the radius of wherein said actuator is less than or equal to the radius in this chamber (r).
19. pump as claimed in claim 1, this of wherein said actuator the second inner panel comprises a piezoelectric part.
20. pump as claimed in claim 1, this of wherein said actuator the second inner panel comprise the restricted parts of magnetic.
21. pump as claimed in claim 1 further comprises an electronic circuit, this electronic circuit and described sensor communicate and are configured to and calculate the pressure of this load place according to a function of the displacement of described actuator.
22. pump as claimed in claim 21, wherein this electronic circuit further is configured to calculate the variance ratio of the pressure of this load place.
23. pump as claimed in claim 1, wherein said sensor are optical sensors that is configured to illuminate and measure the displacement of described actuator.
24. pump as claimed in claim 23, wherein this optical sensor illuminates an annular displacement node of the vibration displacement motion of described actuator.
25. pump as claimed in claim 23, wherein said optical sensor comprise an optical launcher and an optical receiver.
26. pump as claimed in claim 25, wherein this optical launcher comprises a light emitting diode that illuminates described actuator with a light beam, and wherein this optical receiver comprises a photosensor array with a plurality of pixel elements, these reflections when a plurality of reflections of this light beam are moved along this pixel element array of these pixel element sensings, the displacement of the described actuator when these reflections move to this offset position corresponding to described actuator from this position of rest.
27. pump as claimed in claim 25 further comprises an electronic circuit, this electronic circuit and this optical receiver communicate and are configured to and calculate the pressure of this load place according to a function of the displacement of described actuator.
28. pump as claimed in claim 23, wherein this optical sensor comprises be used to the light source that a light beam with a multifrequency spectrum is provided, is placed on the described actuator to be used for that this beam reflection is become to be in the diffraction grating of a plurality of folded light beams of different wave length and an optical receiver that is used for receiving these folded light beams, different displacements of the described actuator when these folded light beams move to this offset position corresponding to described actuator from this position of rest separately in this multifrequency spectrum.
29. pump as claimed in claim 1, wherein said sensor are magnetic sensors.
30. pump as claimed in claim 1, wherein said sensor are RF sensors.
31. method that is used for measuring the pressure that a load is produced by a pump, this pump has an actuator, this actuator is installed on the interior flexible baffle of this pump, this flexible baffle allow this actuator to vibrate to produce to pass this pump a chamber air-flow and allow this actuator to be subjected to displacement because the pressure of this load place increases, described method comprises:
Driving this actuator vibrates in order to produce a plurality of radial pressures of fluid in this chamber with a vibration displacement motion that causes this actuator;
Thereby begin to flow through this chamber so that this actuator increases because of the pressure of this load place and the deflection of this baffle plate when moving to an offset position from a position of rest displacement of measuring this actuator at fluid; And
Calculate the pressure of this load place based on the displacement of this actuator.
32. a disc type pump comprises:
Be installed to a actuator on the pump housing by a flexible baffle, this actuator be configured to that vibration by a kind of vibration displacement forms of motion produces the air-flow that passes this pump housing in case in a load build-up pressure, and
A sensor, this sensor be configured to this pressure of sensing in the position of built-in this actuator immediately of this load so that this pressure can be determined.
33. disc type pump according to claim 32, wherein
This pump housing has a sidewall, this sidewall is at one end sealed by a pair of inner panel in order to be formed for containing an a kind of chamber of fluid in the described pump housing by a diapire sealing and the other end, and wherein first inner panel adjacent with this chamber comprises a core and a periphery in these inner panels;
This actuator is formed by these end plates, but wherein second inner panel in these inner panels is associated with this core of this first inner panel with mode of operation in order to cause this vibration displacement motion in response to one on the described actuator that is applied in the use drives signal;
This baffle plate is connected between this periphery of this sidewall and this first inner panel in order to promote this vibration displacement motion;
First hole extends through described actuator in order to make fluid can flow through this chamber;
Second hole extends through this diapire in order to make fluid can flow through this chamber;
This disc type pump further comprises a valve, this valve is placed in in described the first hole and the second hole at least one, and be adapted to and when fluid begins to flow through this chamber, allow this fluid to flow through this chamber in order to be this load pressurization or decompression in direction of cardinal principle, so that described actuator is shifted to this diapire because of the increase of pressure and the deflection of this baffle plate, namely move to an offset position from a position of rest thus; And
This sensor is installed in outside this chamber, is in a fixed position with respect to the described pump housing.
34. such as claim 32 or 33 described pumps, wherein said sensor is an optical sensor that is configured to illuminate and measure the position of described actuator.
35. such as each the described pump in the claim 32 to 34, wherein this optical sensor illuminates an annular displacement node of the vibration displacement motion of described actuator.
36. such as claim 34 or 35 described pumps, wherein said optical sensor comprises an optical launcher and an optical receiver.
37. such as each the described pump in the claim 34 to 36, wherein this optical launcher comprises a light emitting diode that illuminates described actuator with a light beam, and wherein this optical receiver comprises a photosensor array with a plurality of pixel elements, these reflections when a plurality of reflections of this light beam are moved along this pixel element array of these pixel element sensings, the displacement of the described actuator when these reflections move to this offset position corresponding to described actuator from this position of rest.
38. such as claim 36 or 37 described pumps, further comprise an electronic circuit, this electronic circuit and this optical receiver communicate and are configured to and calculate the pressure of this load place according to a function of the position of described actuator.
39. such as each the described pump in the claim 34 to 38, wherein this optical sensor comprises be used to the light source that a light beam with a multifrequency spectrum is provided, is placed on the described actuator to be used for that this beam reflection is become to be in the diffraction grating of a plurality of folded light beams of different wave length and an optical receiver that is used for receiving these folded light beams in this multifrequency spectrum, and these folded light beams are separately corresponding to a diverse location of described actuator.
40. such as claim 32 or 33 described pumps, wherein said sensor is a magnetic sensor.
41. such as claim 32 or 33 described pumps, wherein said sensor is a RF sensor.
42. such as claim 32 or 33 described pumps, wherein said sensor is a ultrasonic wave sensor.
43. pump as claimed in claim 38, wherein this load is that a function according to the mean place of the sensed part of this actuator calculates.
Applications Claiming Priority (3)
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| US37195410P | 2010-08-09 | 2010-08-09 | |
| US61/371,954 | 2010-08-09 | ||
| PCT/US2011/046815 WO2012021412A1 (en) | 2010-08-09 | 2011-08-05 | System and method for measuring pressure applied by a piezo-electric pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103026066A true CN103026066A (en) | 2013-04-03 |
Family
ID=44651931
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|---|---|---|---|
| CN2011800358374A Pending CN103026066A (en) | 2010-08-09 | 2011-08-05 | System and method for measuring pressure applied by a piezo-electric pump |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US20120034109A1 (en) |
| EP (1) | EP2603699A1 (en) |
| JP (1) | JP2013536358A (en) |
| CN (1) | CN103026066A (en) |
| AU (1) | AU2011289658A1 (en) |
| CA (1) | CA2805102A1 (en) |
| TW (1) | TW201217647A (en) |
| WO (1) | WO2012021412A1 (en) |
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Also Published As
| Publication number | Publication date |
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| AU2011289658A1 (en) | 2013-01-10 |
| JP2013536358A (en) | 2013-09-19 |
| EP2603699A1 (en) | 2013-06-19 |
| TW201217647A (en) | 2012-05-01 |
| WO2012021412A1 (en) | 2012-02-16 |
| CA2805102A1 (en) | 2012-02-16 |
| US20120034109A1 (en) | 2012-02-09 |
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