Controllable ripple diaphragm pump
阅读说明：本技术 可控纹波隔膜泵 (Controllable ripple diaphragm pump ) 是由 G·德雷西 J-B·德勒韦 H·吉耶曼 于 2018-12-05 设计创作，主要内容包括：波纹隔膜循环器(1),包括：-主体(2),在该主体内侧有内部腔室(2a),该腔室(2a)包括用于流体(22)的入口开口和出口开口；-柔性隔膜(3),放置在该腔室中以便能够在那儿呈波纹状起伏。该循环器进一步包括：-致动机构(4),包括至少一个电动机(M)和机械链接部件(41),该机械链接部件(41)将电动机(M)链接到隔膜的第一边缘(31),使得以往复运动的方式移动该第一边缘。该循环器还包括设备(5),用于检测表示隔膜(3)的移动的至少一个值；电源单元,根据检测信号(Sd)将电源信号输送到电动机。(Corrugated diaphragm circulator (1) comprising: -a body (2) inside which there is an internal chamber (2a), the chamber (2a) comprising an inlet opening and an outlet opening for a fluid (22); -a flexible membrane (3) placed in the chamber so as to be able to undulate there. The circulator further includes: -an actuating mechanism (4) comprising at least one electric motor (M) and a mechanical linking member (41), the mechanical linking member (41) linking the electric motor (M) to the first edge (31) of the diaphragm so as to move it in a reciprocating motion. The circulator further comprises means (5) for detecting at least one value indicative of the movement of the diaphragm (3); and a power supply unit which supplies a power supply signal to the motor in accordance with the detection signal (Sd).)
1. A corrugated diaphragm circulator (1), comprising:
-a body (2) inside which there is a chamber (2a) inside said body (2), which chamber (2a) comprises at least one inlet opening (21) for the fluid to flow into said chamber and at least one outlet opening (22) for the fluid to flow out of said chamber;
-a flexible membrane (3) placed in the chamber such that it can undulate there between a first edge (31) and a second edge (32) of the membrane, the first membrane edge (31) being closer to the fluid inlet opening (21) than to the fluid outlet opening (22) and the second membrane edge (32) being closer to the fluid outlet opening (22) than to the fluid inlet opening (21); the circulator further includes:
-an actuating mechanism (4) comprising at least one electric motor (M) and at least one mechanical linking member (41), said mechanical linking member (41) linking said electric motor (M) to a first edge (31) of said diaphragm, so as to move said first edge (31) in a reciprocating manner with respect to said main body (2) in order to produce on said diaphragm (3) a ripple that propagates from said first diaphragm edge (31) to said second diaphragm edge (32), characterized in that said circulator further comprises a device (5) for detecting at least one value representative of the movement of said diaphragm (3) with respect to said main body (2), the detecting device (5) being functionally linked to a motor power supply unit (6), the power supply unit (6) being arranged to deliver at least one power supply signal as a function of a detection signal (Sd) delivered by said detecting device (5) to said power supply unit (6) To said motor, the detection signal (Sd) being dependent on said at least one detected value.
2. A corrugated diaphragm circulator as claimed in claim 1, wherein the detection device (5) is arranged such that the detection signal (Sd) delivered to the power supply unit (6) depends on measurements made by at least one sensor (C1) of the detection device (5), the at least one sensor (C1) being selected from a group of sensors comprising: a hall effect sensor, a resolver sensor, an incremental encoder, an optical sensor using a light beam to measure a movement parameter of the diaphragm surface, a laser sensor using a laser beam to measure a movement parameter of the diaphragm surface, an optical sensor using a light beam to measure a movement parameter of a target, a laser sensor using a laser beam to measure a movement parameter of a target, an accelerometer, a capacitive sensor, an inductive sensor, a resistive sensor, a camera associated with an image analysis system, an infrared sensor, an eddy current sensor.
3. A corrugated diaphragm circulator as claimed in claim 2 wherein the at least one sensor (C1) of the detection device has a target (C12) mechanically linked to the diaphragm (31), the value representing movement of the diaphragm varying during movement of the target (C12) relative to the body (2) of the circulator.
4. A corrugated diaphragm circulator as claimed in claim 1, wherein the detection device (5) is arranged such that the detection signal (Sd) delivered to the power supply unit (6) depends on measurements made by at least one sensor (C1) of the detection device (5) selected from a group of deformation sensors comprising:
-a sensor for detecting deformation of the at least one mechanical linking component linking the motor to the first edge of the diaphragm;
-a sensor for detecting the deformation of at least one spring (42) exerting an elastic force which is variable according to the movement of the first edge of the diaphragm by the motor;
-a deformation sensor attached to the diaphragm for measuring a deformation of the diaphragm.
5. A corrugated diaphragm circulator as claimed in claim 1 wherein said detection means is arranged such that said detection signal delivered to said power supply unit is dependent on a measurement by at least one sensor of said detection means selected from the group of sensors consisting of:
-a sensor for measuring mechanical force;
-a magnetic field sensor;
-a voltage sensor;
-a rotation/angular movement sensor (C7);
-a current sensor (C8).
6. A corrugated diaphragm circulator as claimed in claim 1, wherein the power supply unit (6) is arranged such that the at least one motor (M) power supply signal generated by the unit is dependent on measurements made by at least one sensor of the detection device, the at least one sensor being selected from a group of sensors for detecting fluid properties comprising:
-at least one sensor (C41) for detecting the flow rate of the fluid pumped by the circulator;
-at least one sensor (C42) for detecting the pressure of the fluid pumped by the circulator;
-at least one sensor for detecting the viscosity of the fluid.
7. A corrugated diaphragm circulator as claimed in any one of claims 1 to 6 wherein the actuation mechanism (4) is arranged to define a Maximum Amplitude (MAX) of the reciprocating movement of the first edge (31) of the diaphragm, the maximum amplitude being variable in dependence on the at least one power supply signal delivered to the motor (M).
8. A corrugated diaphragm circulator as claimed in any one of claims 1 to 7 wherein the actuation mechanism (4) comprises an electromechanical assembly for varying the amplitude, different to the motor, the electromechanical assembly comprising the means linking the motor to the first edge of the diaphragm, the electromechanical assembly being arranged to define a maximum amplitude of the reciprocating movement of the first edge of the diaphragm, the maximum amplitude being variable in dependence on a maximum amplitude set point delivered to the electromechanical assembly by an amplitude control unit.
9. A corrugated diaphragm circulator as claimed in any one of claims 1 to 8 wherein the value indicative of movement of the diaphragm relative to the body is a maximum amplitude of movement measured from the first edge (31) of the diaphragm relative to the body (2).
10. A corrugated diaphragm circulator as claimed in any one of claims 1 to 9, wherein the circulator comprises a fluid deflector (Dx) located in the chamber (2a) and connected to the body (2) so as to direct fluid arriving in the chamber via the fluid inlet opening towards the first diaphragm edge in a direction (D) running from the first diaphragm edge towards the second diaphragm edge, the sensor for detecting the movement of the first diaphragm edge belonging to the detection device and being attached to the deflector.
11. The corrugated diaphragm circulator of any one of claims 1-10 wherein said diaphragm adopts a general shape selected from the group of diaphragm shapes comprising a disk shape, a rectangular shape, and a tubular shape.
12. A corrugated diaphragm circulator as claimed in any one of claims 1 to 11 wherein said motor comprises a movable rotor (M1) and a stator (M2), said movable rotor (M1) comprising at least one permanent magnet (M10), said stator (M2) comprising at least one stator coil (M21, M22) adapted to generate a magnetic flux in response to said at least one motor (M) power signal delivered by said motor power unit (6) to said at least one coil (M21, M22).
13. A corrugated diaphragm circulator as claimed in the preceding claim, wherein the detection device (5) comprises at least one sensor (C5, C6) for detecting the position of the rotor relative to the at least one stator coil (M21, M22).
14. A corrugated diaphragm circulator as claimed in any one of claims 1 to 13 wherein the sensing means (5) is arranged to sense the respective position of a plurality of points on the diaphragm relative to the body (2).
15. Diaphragm circulator as claimed in claim 14, wherein the detection device is arranged to collect images of a longitudinal contour of the diaphragm extending between a first edge (31) and a second edge (32) of the diaphragm in order to detect the position of points on the diaphragm, which points belong to the longitudinal contour of the diaphragm.
16. A diaphragm circulator as claimed in claim 14, wherein the detection device is arranged to collect an image of a surface of the diaphragm extending between a first edge (31) and a second edge (32) of the diaphragm so as to detect the position of points on the diaphragm which belong to the shape of the surface of the diaphragm in three dimensions to define a three-dimensional image of the diaphragm and a change in the three-dimensional image over time.
Background
The present invention relates to the field of corrugated diaphragm circulators.
Known for example from document WO2007063206 is a corrugated diaphragm circulator comprising:
-a body inside which there is a chamber inside the body, the chamber comprising an inlet opening for fluid flow into the chamber and an outlet opening for fluid flow out of the chamber;
-a flexible membrane placed in the chamber so as to be able to undulate there between a first edge and a second edge of the membrane, the first membrane edge being closer to the fluid inlet opening than to the fluid outlet opening and the second membrane edge being closer to the fluid outlet opening than to the fluid inlet opening; the circulator further includes:
-an actuation mechanism comprising at least one motor and at least one mechanical link member linking the motor to the first edge of the diaphragm such that the first edge is moved in a reciprocating motion relative to the body so as to generate corrugations on the diaphragm that propagate from the first diaphragm edge to the second diaphragm edge.
The corrugations allow fluid to be drawn from the fluid inlet opening to the fluid outlet opening. Due to its reciprocating motion, the circulator may generate vibrations that are desirably controlled in order, for example, to envisage increasing the service life of the circulator.
Object of the Invention
It is an object of the present invention to provide a device for controlling parameter(s) affecting the oscillation of a circulator.
Disclosure of Invention
To this end, according to the invention, a corrugated diaphragm circulator is proposed, comprising:
-a body inside which there is a chamber inside the body, the chamber comprising at least one inlet opening for fluid flow into the chamber and at least one outlet opening for fluid flow out of the chamber;
-a flexible membrane placed in the chamber so as to be able to undulate there between a first edge and a second edge of the membrane, the first membrane edge being closer to the fluid inlet opening than to the fluid outlet opening and the second membrane edge being closer to the fluid outlet opening than to the fluid inlet opening; the circulator further includes:
-an actuation mechanism comprising at least one motor and at least one mechanical link connecting the motor to the first edge of the diaphragm such that the first edge is moved in a reciprocating motion relative to the body so as to create on the diaphragm a ripple that propagates from the first diaphragm edge to the second diaphragm edge.
The circulator according to the invention is primarily characterized in that it further comprises a device for detecting at least one value representative of the movement of the diaphragm relative to the body, the detection device being functionally linked to a motor power supply unit arranged to deliver at least one power supply signal to the motor in dependence on a detection signal delivered to the power supply unit by said detection device, the detection signal being dependent on said at least one detected value.
Detecting a value representative of the movement of the diaphragm and then generating a detection signal representative of the at least one detected value and finally controlling the motor via said at least one motor power signal (which itself depends on the detection signal) allows controlling the operation of the motor and thus enables it to act on the movement of the diaphragm in the body.
Since the circulator vibration is mainly dependent on the propagation characteristics of the waves along the diaphragm, by providing means for controlling the motor in dependence of the movement of the diaphragm, means for controlling the parameters affecting the circulator vibration are provided.
This has a number of advantages as it can affect the service life of the circulator by adjusting the operation of the circulator in accordance with the movement of the diaphragm within the body.
The control allows the circulator to be feedback controlled in accordance with the movement of the first edge of the diaphragm, which allows the hydrodynamic properties of the circulator, i.e. the flow rate of the fluid being pumped, the pressure difference between the inlet and outlet of the chamber, the flow rate and/or the profile of the chamber outlet pressure over time, to be varied at any given time in addition to controlling the frequency and/or amplitude of the movement of the diaphragm edge.
In a preferred embodiment of the invention, the actuation mechanism is arranged to define a maximum amplitude MAX of the reciprocating movement of the first edge of the diaphragm, the maximum amplitude being variable in dependence on said at least one power supply signal to the motor.
The electric motor is thus a motor whose maximum oscillation amplitude/maximum stroke of the rotor relative to the stator is variable as a function of the at least one motor supply signal.
In the present invention, the term "rotor" refers to the part of the motor that is movable relative to the stator, without implying that this mobility is necessarily a rotation. In this case, in the present invention, the rotor may be linearly or mainly linearly movable with respect to the stator. For the purposes of understanding the present invention, linear motor means any motor in which the rotor follows a trajectory with respect to the stator that follows a line segment in a complete motor cycle, the movement passing through the end of the line segment without ever deviating from the line segment by a distance of more than 10% of the length of the line segment. Thus, the power supply unit can adjust the distance between the edge of the diaphragm and the chamber wall in order to vary the "bite", i.e. the minimum fluid flow area allowed by the diaphragm at any given time in its corrugations.
The minimum allowable fluid flow area is the minimum flow area allowed between the fluid inlet opening and the fluid outlet opening at any given time. It should also be noted that by adjusting the maximum amplitude of the movement of the membrane and the frequency of its oscillation and by following the movement applied during the movement time with respect to the first edge of the supported membrane, the power supply unit can define the variation of the wavelength travelling along the membrane and therefore the number of inflection points of the wave travelling along the membrane in the chamber.
The more inflection points in the wave of the diaphragm for a given minimum flow area value, the greater the pressure difference allowed by the circulator between the fluid inlet opening and the fluid outlet opening. Thus, the head of fluid allowed by the circulator can be controlled.
Thus, the circulator according to the invention enables the amplitude of the movement of the first upstream edge and/or the oscillation frequency of the first edge and/or the force applied to the first edge of the diaphragm and/or the profile of the movement of the first edge of the diaphragm over time to be adjusted by allowing the at least one motor power supply signal to be adjusted taking into account one or more values detected and representative of the movement of the first edge of the diaphragm.
Thus, the circulator allows control of the minimum flow area value through the chamber and the number of inflection points in the diaphragm that affect the fluid flow rate and fluid pressure delivered by the circulator.
The present invention will be described in more detail with reference to the drawings described below.
Drawings
Figure 1 is a perspective view of one embodiment of a circulator 1 with a corrugated diaphragm according to the invention, comprising a diaphragm placed in a chamber formed in the body of the circulator so as to undulate in the chamber under the influence of a movement generated by an electric motor M, according to the regulation of a power supply signal for the motor, as measured by the movement of a first edge of the diaphragm using a position sensor comprising a target attached to the first diaphragm edge, and means for detecting the position of the target relative to the stator of the motor (in this example, the target is a permanent magnet);
FIG. 2 is a perspective view of another embodiment of a circulator according to the invention, wherein the diaphragm is disk-shaped and the diaphragm of FIG. 1 is band-shaped;
figure 3a shows a schematic view of a corrugated diaphragm in a chamber having a device for detecting a value indicative of the movement of the diaphragm, where the device is a sensor detecting the position of a first edge of the diaphragm, such as a preferably analog proximity sensor detecting the position of the first edge of the diaphragm relative to a fixed point of the chamber;
fig. 4 shows a schematic diagram of a circulator according to the invention with a power supply unit comprising means for delivering power to different coils of a motor, and a detection device generating a detection signal using a measurement of a value representing the movement of the diaphragm generated via at least one sensor, in this case via a plurality of sensors belonging to the detection device.
Detailed Description
As described above and particularly shown in fig. 1-4, the present invention is primarily directed to a corrugated diaphragm circulator 1 comprising:
a
a
an actuating mechanism 4 comprising at least one electric motor M and at least one mechanical linking member 41 linking the electric motor M to the
For the purposes of understanding the present invention, linear reciprocation means movement of a given point or object following a trajectory traced along a line segment in one complete reciprocation cycle, the movement passing through the end of the line segment without ever deviating from the line segment by a distance of more than 10% of the length of the line segment.
Preferably, the first diaphragm edge is reinforced by a reinforcement to limit deformation of the first edge when the first edge moves according to the reciprocating motion. Thus, the uniform movement of the first edge of the diaphragm limits the occurrence of secondary waves on the diaphragm.
The circulator according to the invention has a
The
The power supply unit 6 is arranged to deliver at least one power supply signal to the motor in dependence on a detection signal Sd delivered to the power supply unit 6 by said
The invention makes it possible to regulate the motor according to the actual movement of the diaphragm in the chamber, which movement is estimated by measuring at least one value representative of this movement by means of said
By virtue of this adjustment via the at least one power supply signal, the movement of the diaphragm can be controlled such that the circulator adopts a desired operating point. The operating point is the state of various operating parameters of the circulator at a given time in operation.
Depending on the circumstances, the circulator may be feedback controlled in order to limit the level of vibrations generated during its operation, thereby limiting the energy loss through the contact of the membrane with the wall of the chamber and/or in the form of the membrane hitting the wall. Therefore, the service life of the circulator can be improved.
Of course, this control may be used to reach a desired operating point of the circulator, where the flow rate and/or the pressure difference and/or the ripple frequency and/or the ripple wavelength between upstream and downstream of the circulator is selected as a set point to be reached and as a basis for determining the change over time of said power supply signal to be generated.
To this end, the
The sensor or sensors may be arranged to measure a position, velocity or acceleration indicative of movement of the first edge of the diaphragm.
The incremental encoder may be a rotary encoder for incrementing an value according to the rotation angle, or may be a translational encoder for incrementing an value according to the translational distance.
Additionally, the at least one sensor C1 of the detection device may have a target C12 mechanically linked to any region of the diaphragm, and more specifically to the first edge of the
The target may be a target whose motion may be detected by measuring a magnetic and/or electric and/or electromagnetic field that varies with the movement of the target.
It is also possible that the sensor C1 can detect relative movement of the diaphragm with respect to the body without the use of a target. Thus, the optical sensor or laser sensor may measure the movement of any point on the diaphragm, whether or not the diaphragm bears an attached target.
It is also envisaged that said
a sensor for detecting a deformation of said at least one mechanical link member 41, the at least one mechanical link member 41 linking the motor to the first edge of the diaphragm;
a sensor for detecting the deformation of at least one spring 42 exerting an elastic force which is variable according to the movement of the first edge of the diaphragm by the motor;
a deformation sensor attached (e.g. fixed to or contained within … …) to the diaphragm, e.g. at a first edge of the diaphragm or a second edge of the diaphragm, or at any position between these edges, for measuring the deformation of the diaphragm;
a sensor for detecting at least one mechanical stress to which said mechanical link 41 is subjected;
a sensor for detecting at least one mechanical stress undergone by said at least one spring 42.
As can be seen in particular in fig. 2 and 4, the spring may be mechanically linked to a mechanical link member 41, which mechanical link member 41 mechanically links the motor to the
The spring may be a leaf spring comprising one or more resilient leaves and/or one or more helical springs.
Ideally, the movement of the mechanical link is guided by guide means, which may be formed by elastic means alone, or by a pivot or sliding guide potentially associated with such elastic means as shown in fig. 2.
It is also envisaged that the
a sensor for measuring mechanical force (such as for example a force sensor placed at the interface between the mechanical link part 41 and the first edge of the membrane);
-a magnetic field sensor;
-a voltage sensor;
-a rotation/angular movement sensor (C7) (e.g. for a rod/crank rotation motor);
translational movement sensors (e.g. for linear motors);
-a current sensor (C8, C8').
The motor M includes a movable rotor M1, i.e., a component that is movable relative to a stator M2 of the motor by rotation, translation, or the like.
This rotor M1 comprises at least one permanent magnet M10, in which case at least two permanent magnets are distributed symmetrically with respect to the first diaphragm edge.
The stator M2 comprises at least one stator coil, in this case two coils M21, M22 arranged to face the path followed by the permanent magnets during the reciprocating motion of the first edge.
Each coil is adapted to generate a magnetic flux in response to said at least one power supply signal from the motor M, which magnetic flux acts on the permanent magnets to produce an attractive or repulsive force to the permanent magnets, thereby generating a movement of the rotor relative to the stator.
A motor power signal is supplied to each of the at least one coils M21, M22 by the motor power unit 6. The stator coils are stator windings, i.e., electrically conductive wires wound on a core and assembled so as to be able to remain fixed relative to the body of the circulator.
Preferably, the electric motor is a brushless motor or an autonomous permanent magnet synchronous machine, the electric motor comprising a structure to which said rotor position sensor is fixed, said at least one permanent magnet of the rotor being movably mounted with respect to the structure, and said rotor position sensor is preferably a sensor measuring the position of said at least one permanent magnet with respect to the structure of the electric motor.
In this case, the
In the case of driving performed by a brushless motor, it is preferably ensured that any movement of the rotor is associated with a corresponding movement of the
Thus, a sensor integrated in the brushless motor may be used to measure the movement of the rotor with respect to the stator of the motor, a detection device being linked to this sensor integrated in the brushless motor and adapted to generate said detection signal Sd from the values measured using this sensor integrated in the brushless motor.
The sensor or sensors integrated within the motor may be one or more hall effect current sensors associated with a program for measuring the force and speed (frequency) of the rotor.
In this way, the need to add sensors in addition to those already integrated in the motor is limited.
When the viscosity of the fluid at the head of the circulator and the hydraulic head is known, determining the force by means of a sensor integrated (or otherwise) within the motor makes it possible to determine the position of the first edge of the diaphragm relative to the body.
It is also envisaged that the power supply unit 6 is arranged so that said at least one electric motor M power supply signal generated by said unit depends on measurements made by at least one sensor of said
at least one sensor C41 for detecting the flow rate of the fluid pumped by the circulator;
at least one sensor C42 for detecting the pressure of the fluid pumped by the circulator;
-at least one sensor for detecting the viscosity of the fluid.
Ideally, as shown in fig. 4, the power supply unit 6 comprises a computer 60, the computer 60 being arranged to define the characteristics of the at least one motor M power supply signal using mathematical functions and/or using a mapping database and/or logical operators (IF THEN) for the circulator and in dependence on pressure and flow rate values of the fluid flowing through the circulator chamber, these values being measured using the flow rate sensor C41 and the at least one pressure sensor C42.
It should be noted that the pressure sensor upstream of the chamber and the pressure sensor C42 downstream of the chamber may be used to measure the change in the difference between the upstream fluid pressure and the downstream fluid pressure over time.
This information makes it possible to deduce from the variation of this difference the frequency of movement of the edge of the first diaphragm and the speed of movement of the fluid.
The map may define a plurality of operating points that constitute a relationship between the amplitude of movement of the first diaphragm edge, the viscosity of the fluid, the flow rate of the fluid produced by the circulator, the upstream and downstream pressure differences, and the frequency of reciprocation of the first diaphragm edge relative to the body.
By knowing some of these parameters, for example because they are predetermined/fixed and measured, the effect of a change in the motor power signal on a change in one of these parameters sought to be adjusted can be known.
Thus, if the parameter to be adjusted is the amplitude of movement of the upstream edge of the diaphragm to ensure that the diaphragm does not collide with the walls of the chamber, the computer 60:
-knowing the viscosity of the fluid, and the measured value of the flow rate of the fluid generated by the circulator, the upstream and downstream pressure difference and the frequency of the reciprocal movement of the edge of the first diaphragm with respect to the body;
-a current value of the amplitude of movement of the first diaphragm edge relative to the body can be derived from a mapping database; and
-defining a target value to be reached for the amplitude of the movement of the first edge; and
in order to reach the target value at a given time, the computer deduces the characteristics of the power supply signal to be delivered.
Thus, the movement of the diaphragm is kept under control, for example, in order to always keep the diaphragm away from the walls of the chamber or at a certain predetermined distance from these walls of the chamber.
The control circulator may also be sought via the power supply signal to reach a target value for one of these mapping parameters.
The target/set point value may be a pressure differential or a target flow rate value.
The computer 60 uses the mapping and/or mathematical functions and/or databases and/or logical operators (IF THEN) and the detection signal Sd to determine the power supply signal to be generated in order to reach the selected target value.
The mapping database may be generated via a plurality of cycler tests to determine a plurality of operating points therefrom.
Each given operating point defines the values taken by the various operating parameters of the circulator, including:
-the viscosity of the fluid; and/or
-a fluid flow rate; and/or
-pressure difference upstream and downstream (i.e. head parameters of the circulator); and/or
-relative pressure upstream and/or downstream with respect to the pressure between the ambient atmosphere; and/or
-a frequency of reciprocation of the first diaphragm edge relative to the body; and/or
-amplitude of movement of the first diaphragm edge; and/or
-a variation of the force delivered by the motor; and/or
-the elastic stiffness of the membrane; and/or
A spring rate/spring rate curve of a spring means (such as a spring forcing the first membrane edge back to a determined position); and/or
-a corresponding characteristic of each at least one motor power signal, such as the frequency of the signal, its intensity, its voltage or a curve of the variation of the intensity over time.
Typically, the actuating mechanism 4 is arranged to define a maximum amplitude MAX of the reciprocating movement of the
This rule of varying the maximum amplitude MAX in dependence on the power supply signal to the motor M is preferably integrated in the mapping database.
Thus, the power supply signal may be adjusted to vary the maximum amplitude of movement of the first edge in a plurality of successive reciprocations of the diaphragm.
In this context it can be ensured that the actuating mechanism 4 comprises an electromechanical component, different from the electric motor, for varying the amplitude of the vibration.
The electromechanical assembly comprising said means linking the motor to the first edge of the diaphragm is here arranged to define a maximum amplitude of the reciprocating movement of the first edge of the diaphragm, which is variable according to a maximum amplitude set point delivered to said electromechanical assembly by the amplitude control unit.
Thus, there are several ways to vary the amplitude MAX over time, one by controlling the motor via a power signal, and another by controlling a different electromechanical component from the motor via an amplitude set point signal that is different from the motor power signal. This embodiment may be advantageous for situations where it is desired to control the amplitude of movement of the first membrane edge using a motor with a fixed/constant maximum amplitude of movement.
In this embodiment (not shown in the drawings) the mechanical link means may be an arm pivoting about a pivot axis, an electromechanical actuator acting on the position of the pivot axis relative to the pivot arm or on a variable length of the arm to define the amplitude of movement of the diaphragm edge without having to change the stroke/maximum amplitude of the motor.
It should be noted that the value representing the movement of the diaphragm relative to the body may be a maximum amplitude of movement measured from the
As shown in fig. 4 and discussed above with reference to different possible sensor groups, the
It is preferred to use at least one sensor on the mechanical link between the motor and the first membrane edge, since at this position the most reliable measurement of the movement parameter of the first membrane edge (i.e. its position and/or its velocity and/or its frequency and/or its acceleration and/or the force transmitted to the first edge and/or the maximum movement amplitude of the first edge) can be obtained.
To measure one or more values representative of the movement of the
As shown in fig. 3b and 3c, the
For example, the detection device may be arranged to collect images of a longitudinal contour Prf of the diaphragm extending between the
To this end, as shown in fig. 3b, the detection device may comprise a plurality of sensors C1, C1', C1 "distributed on the body, facing the longitudinal profile Prf of the diaphragm running from the first diaphragm edge towards the second diaphragm edge. The contour extends along the diaphragm.
These sensors C1, C1', C1 "can be associated respectively with corresponding targets C12, C12', C12" carried by the membrane and/or by the body, to measure relative positions, each showing the position of one of said sensors C1, C1', C1 "with respect to one of said targets C12, C12', C12" corresponding thereto.
Alternatively, as shown in fig. 3c, the detection device may comprise an imaging device comprising a light source, such as a laser source generating a diaphragm illumination plane extending along the diaphragm from the
Alternatively, the detection device may be arranged to collect an image of a surface of the diaphragm extending between the
It should be noted that where a light beam or optical sensor is used to capture the diaphragm image, the body may be made at least partially transparent for viewing therethrough, or alternatively the sensor may be given a viewing window oriented into the interior of the cavity.
As shown in fig. 2, the circulator may comprise at least one fluid deflector Dx located in the
The
The diaphragm may be made of one or more materials selected from flexible elastomers-Nitrile Butadiene Rubber (NBR) -Natural Rubber (NR) -Ethylene Propylene Diene Monomer (EPDM) -silicone rubber (VMQ) -Polyurethane (PU) -other food grade materials (neoprene (CR) -vulcanizing agent (PDM) -peroxide-fluoro rubber (FKM) -pure polytetrafluoroethylene (virgin PTFE)) -Polyvinylchloride (PVC) -silicone and/or metallic materials such as stainless steel.
The interaction between the sensor and its "target", which may be the membrane edge itself or a target carried by this first edge, may be achieved by means of a camera associated with the image analysis system or by means of a system for measuring a magnetic field (if the target generates a magnetic field, where the target is a magnet or an inductor) or an electric field (if the target is a current conductor) or an electromagnetic field.
The sensor may also be optical and provided with means for optically illuminating the target (the first membrane edge constituting or carrying the target) via a light beam such as an infrared or laser beam. In this embodiment, the sensor comprises a device sensitive to the reflection of the light beam off the target, such as a light sensitive cell. The closer the target is to the sensor, the greater the intensity of the reflected beam, which may be known as to the position of the first edge of the diaphragm relative to the sensor.
The circulator according to the invention may be a liquid circulator, a gas circulator, a pump, a fan, a compressor or a propeller.
Some advantages of the invention are as follows:
optimum degree of engagement: feedback on the position of the diaphragm makes it possible to control the circulator to ensure an optimum given degree of engagement, regardless of the head (fluid with variable viscosity, presence of particles, head loss, etc.) to which the circulator is subjected. By modulating the amplitude and/or frequency of the ripple, i.e. the torque and speed of the motor, optimum efficiency and hydraulic power can be ensured. The risk of flow reversal (known as "backflow", i.e. flow from the outlet of the chamber to the inlet of the chamber) can be managed. Controlling the amplitude/frequency pair makes it possible to minimize this backflow at low hydraulic power requirements and when the bite cannot be observed.
Managed shear stress: the detection device and its sensor or sensors allow fine control of the minimum distance between the diaphragm and the chamber wall and the wave propagation characteristics along the diaphragm, thereby limiting fluid shear stress. This is particularly advantageous for certain applications, such as in a heart assist circulator, where the physicochemical structure of the fluid being transported is susceptible to change in shear events above a predetermined threshold.
The implementation mode is simplified: the detection device and its sensor or sensors can be implemented very simply, for example by positioning a hall effect sensor on the stator facing the rotor and its permanent magnets (for brushless motors).
An operation indicator: the detection device and its sensor or sensors make it possible to provide other indications about the operation of the circulator as a function of the position of the diaphragm, such as for example the position of the rotor, or the flow rate and pressure for a given fluid viscosity, or, ultimately, very simply, whether the circulator is operating or not.
Indicator for pumped fluid: measuring the position of the first diaphragm edge also makes it possible to provide an indication as to the viscosity of the fluid being pumped, in particular by means of a mapping database generated with a given fluid, or by means of a calibration of the circulator with a fluid of a given viscosity. Thus, knowing the characteristics of the power supply signal, such as the electrical power delivered to the motor and the amplitude acquired via the detection device, the fluid viscosity can be derived therefrom using the mapping data. The invention may thus relate to a method according to the invention for measuring the viscosity of a fluid flowing through a chamber of a circulator. The method includes applying a predetermined power signal to the motor and includes measuring an amplitude of a first diaphragm edge resulting from the actuation of the motor and then deriving a value representative of a viscosity of the fluid actually pumped from the measured amplitude and from data from a map correlating power signal data with diaphragm movement amplitude data and fluid viscosity data. For the same electrical power, a less viscous fluid has a greater amplitude than a more viscous fluid.
Flexible control speed: the processing of the information from the one or more sensors may be matched to the complexity of the control of the motor to be achieved. The control speed of the diaphragm movement depends on the speed at which it must be controlled: each of its peak amplitudes/oscillations is controlled, either for a longer time (controlling multiple oscillations/amplitudes-possibly reducing the sensor sampling frequency), or occasionally to check whether the circulator is working properly. In this case, the invention may also relate to a method for estimating the operating state of a circulator, the method comprising applying a motor power signal and observing the amplitude of the first edge of the diaphragm as a liquid of known viscosity flows through the chamber, and then generating a circulator state signal in dependence on the value assumed by the measured amplitude. Depending on the status signal, the power supply unit may command a stop of the supply of power to the motor and generate an alarm or, conversely, continue to utilize the power supply. Additionally, the control may be performed according to any type of control/corrector: on/off, proportional-integral-derivative, fuzzy logic, etc. In the case of an actuator powered by an inverter, the movement of the actuated side of the feedback control diaphragm may therefore result in a real-time modification of the PWM control of the power bridge (i.e. the power switching device), the more or less occurring modification often depending on the desired control speed of the circulator.
Volume measurement: depending on the viscosity of the fluid and the head, the detection device and its sensor or sensors allow precise control of the pumping flow rate and delivery pressure (an advantage of positive displacement circulators such as peristaltic, piston, or diaphragm circulators). Feedback control of the system in terms of flow rate or pressure is improved.
Safe circulator: making the circulator more reliable, avoiding any excessively high amplitude, which would have a negative impact on the system, making it noisy and consuming power unnecessarily, for example when the quality factor of the system is very good (operating at resonance frequency, with no friction between the movable part and the other parts, due to good guidance by the spring), leading to divergent oscillations of gradually increasing size, or even in the case of variable hydraulic heads, to variable diaphragm oscillations at the same mechanical power (for example for valve closure, the amplitude sometimes increases by as much as 60% than that for valve opening). This also makes it possible to detect any abnormal operation of any abnormal movement of the diaphragm/circulator: blockage, breakage, removable part "lambada". In the case where the circulator must be self-priming, it must be run empty first. The motion sensor then has the advantage of avoiding any runaway of the motor (due to low load) and of making the circulator safe. Thus, the safety and the lifetime of the system (head of the circulator, motor, electronics), the safety and the lifetime of the hydraulic circuit and, more generally, the safety of the environment of the circulator (in particular the safety of the user) are improved.
Hardware control: as with rotating brushless motors, position control can be implemented by means of hardware, thereby reducing costs associated with software control (see fig. 1). The particularity of this type of control is to allow the rotor to oscillate precisely at the resonant frequency of the system, which oscillation is not forced.
Adjusting the waveform: for fluids or loads, this measurement can be used to adjust the shape of the current in the motor (typically sinusoidal) in order to improve the ripple of the diaphragm and find the best control strategy (triangle, square, sine with offset to increase or decrease the midpoint of the oscillation of the diaphragm, pulse, any periodic sequence, etc.) to increase the efficiency of the system. The detection device and its sensor or sensors thus make it possible to automate the control of the circulator.
Circulator calibration: measuring the position of the diaphragm can help calibrate the circulator during its manufacture or maintenance in order to adjust the circulator parameters as best as possible: increasing the number of motor turns, modifying the spacing of the plates forming the opposing walls of the chamber, replacing components, modifying the midpoint of the diaphragm oscillation by adjusting the position of the diaphragm support, modifying the resonant frequency by changing the spring. For certain applications where the hydraulic head is not changed, or those that do not provide critical functionality, the calibration may be the time during which the sensor is connected to the circulator only once during its lifetime.
Space for releasing the circulator head (herein head refers to the body of the circulator): this position measurement also makes it possible to place the diaphragm in the desired position between the two plates, for example by pressing it against the plates so that a larger object passes through the head of the circulator, which larger object cannot pass through when the diaphragm is in the middle, or to avoid any head loss caused thereby when filling the hydraulic circuit of the diaphragm or subjecting the diaphragm to high/low pressures.
The use of several sensors: the incorporation of multiple sensors into the detection device of the circulator allows the circulator to be more reliable or to measure more accurately by redundancy of information. These sensors can be positioned, in particular, at different positions on the upstream edge of the diaphragm, so as to provide a picture of the full oscillation of this upstream edge and detect any anomalies, such as an anomalous corrugation of a portion of the edge ("lambdad" of the movable portion). In the case of motors having a plurality of phases and a plurality of mechanical linkage members, each motor being driven by one of the phases and each motor being connected to a portion of the first membrane edge specific thereto, the correction of the movement can be performed in real time. Specifically, each phase controls a portion of the edge of the diaphragm, and by modulating the amplitude of the current in that phase, the amplitude of that portion of the edge of the diaphragm is modulated.
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