Undulating-membrane fluid circulator

Abstract

The present invention relates to an undulating-membrane fluid circulator having an intake port (3), a pump housing (4) delimiting a propulsion chamber (5), a discharge port (6), and an undulating membrane (2) paired with a drive means permitting an undulating movement of the membrane (2) between the upstream (8) and downstream (9) edges thereof, the undulating membrane (2) being capable of moving a fluid towards the discharge port (6). According to the invention, the circulator further comprises at least one means (7) for guiding the fluid, said means being disposed in the fluid propulsion chamber (5) near one of the edges (8, 9) of the undulating membrane (2) and making it possible to channel the fluid flow in a direction substantially parallel to the displacement of the wave along the membrane (2).

Claims

1. An undulating-membrane fluid circulator comprising: at least one intake port, a pump housing delimiting a propulsion chamber, at least one discharge port, and a deformable membrane paired with an actuator configured to generate an undulating movement of the deformable membrane between a first edge and a second edge, the deformable membrane configured to undulate in a wave-like manner and move a fluid towards the discharge port, wherein the fluid circulator comprises a first guiding structure disposed in the fluid propulsion chamber coupled to an edge of the deformable membrane, wherein the first guiding structure is configured to guide the fluid from a first direction substantially parallel to the deformable membrane to a second direction perpendicular to the first direction, and wherein the first guiding structure is positioned between the deformable membrane and at least a portion of the actuator.

2. The fluid circulator according to claim 1, wherein the fluid circulator comprises a second guiding structure, wherein the first guiding structure is disposed near a first edge of the deformable membrane and wherein the second guiding structure is disposed near a second edge of the deformable membrane.

3. The fluid circulator according to claim 2, wherein the first guiding structure comprises a baffle.

4. The fluid circulator according to claim 3, wherein the baffle is flexible.

5. The fluid circulator according to claim 3, wherein the baffle is disposed substantially parallel to the deformable membrane.

6. The fluid circulator according to claim 2, wherein the second guiding structure is elastically connected to a movable portion of the actuator, such that the second guiding structure is guided in an elastically deformable manner relative to the movable portion.

7. The fluid circulator according to claim 2, wherein the second guiding structure comprises a baffle and the baffle is secured to the pump housing.

8. The fluid circulator according to claim 1, wherein the first guiding structure comprises at least one heat transfer element that is capable of varying the temperature of the fluid.

9. The fluid circulator according to claim 1, wherein the first guiding structure is disposed at a distance from the first or second edge of the deformable membrane of less than one fiftieth of a length separating the first and second edges of the deformable membrane.

10. The fluid circulator according to claim 1, wherein the fluid circulator comprises a second guiding structure connected via a flexible connection to the first edge or the second edge of the deformable membrane, the second guiding structure, together with the deformable membrane and the flexible connection, forming a tight barrier between two different spaces of the propulsion chamber separated from one another by the deformable membrane.

11. An undulating-membrane fluid circulator comprising: at least one intake port, a pump housing delimiting a propulsion chamber, at least one discharge port, and a deformable membrane paired with a drive configured to generate an undulating movement of the deformable membrane between a first edge and a second edge, the deformable membrane configured to undulate in a wave-like manner and move a fluid towards the discharge port, wherein the fluid circulator comprises a first guiding structure configured to guide the fluid disposed in the fluid propulsion chamber, coupled to an edge of the deformable membrane, positioned between at least a portion of the drive and the deformable membrane, and configured to cause the fluid to transition from a first direction to a second direction different than the first direction and substantially parallel to the deformable membrane.

12. The fluid circulator according to claim 11, further comprising a second guiding structure disposed in the fluid propulsion chamber, wherein the first guiding structure is disposed near a first edge of the deformable membrane and wherein the second guiding structure is disposed near a second edge of the deformable membrane.

13. The fluid circulator according to claim 11, wherein the second guiding structure comprises a baffle.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The present invention will be better understood by reading the description of a detailed exemplary embodiment with reference to the appended drawings, provided by way of non-limiting example, in which:

(2) FIG. 1 is a schematic representation, in a side sectional view, of an exemplary embodiment of a fluid circulator, in this case longitudinal, according to a first example according to the invention;

(3) FIG. 2 is a schematic representation, in partial diametrical section, of a second exemplary embodiment of a fluid circulator, in this case circular, according to the invention;

(4) FIG. 3 is a schematic representation, in a partial sectional view, of a third exemplary embodiment of a fluid circulator, in this case longitudinal, according to the invention;

(5) FIG. 4 is a schematic representation, in a side sectional view, of a fourth exemplary embodiment of a fluid circulator, in this case cylindrical, according to the invention;

(6) FIG. 5 is a perspective view of a first alternative embodiment of an element of the invention;

(7) FIG. 6 is a perspective view of a second alternative embodiment of an element of the invention;

(8) FIG. 7 is a perspective view of a fifth example of a fluid circulator.

(9) FIG. 8 is a schematic representation, in partial diametrical section, of another exemplary embodiment of a fluid circulator.

DETAILED DESCRIPTION OF THE INVENTION

(10) With reference primarily to FIG. 1, a circulator 1 having a deformable undulating membrane 2 in the form of a longitudinal strip, a fluid intake port 3, a pump housing 4 delimiting a propulsion chamber 5, and a discharge port 6 is partially shown.

(11) The undulating membrane 2 is paired with a drive means permitting an undulating movement of the membrane 2 between the upstream 8 and downstream 9 edges thereof, said drive means as well as the elements for connection to the membrane featuring in the application FR 2 744 769 and not being shown in the appended FIGS. 1 to 6 in order to make same easier to interpret. The drive means advantageously consists of an actuator connected directly or via a connection element to the upstream edge of the membrane 2.

(12) By actuating the membrane 2, an undulation that propagates from the upstream edge 8 towards the downstream edge 9 of the membrane 2 can be created. The fluid is introduced into the propulsion chamber 5 via the intake port 3 and then moved towards the discharge port 6 by means of the undulations of the membrane 2.

(13) In order to improve this transfer towards the discharge port 6, according to the invention, the circulator 1 is equipped with means 7 for guiding the fluid. FIG. 1 shows guiding means 7 disposed in the propulsion chamber 5 upstream of the undulating membrane 2.

(14) Said guiding means 7 make it possible to channel the fluid flow in a direction substantially parallel to the displacement of the wave along the membrane 2.

(15) The fluid arriving upstream of the membrane 2 is prevented from moving transversely to the displacement of the wave by the guiding means 7 and, consequently, the fluid cannot flow above or below the membrane 2 depending on the undulations thereof. In this way, the pressure differential created by the undulation is no longer compensated by a transverse transfer of fluid, as in the case of the circulator described in the document FR 2 744 769.

(16) The pressure differential, which is therefore maintained, ensures good propulsion of the fluid by the part of the membrane near the upstream edge 8, which thus becomes effective. The hydraulic power generated by the circulator 1 is therefore increased.

(17) According to an advantageous feature of the invention, guiding means 7 are also provided downstream of the membrane 2 close to the downstream edge 9 of the membrane 2.

(18) The function of the guiding means 7 disposed downstream is the same as that of those located upstream of the membrane 2, i.e. making it possible to maintain a pressure differential by directing the fluid flow leaving the membrane 2, thus ensuring good propulsion of the fluid by the downstream edge 9. In this way, the entire membrane 2 is used effectively and the hydraulic power of the circulator 1 is increased.

(19) In the preferred embodiment shown in the appended figures, the guiding means 7 comprise at least one baffle 10.

(20) The baffle 10 is advantageously made of a flexible material, such that it not only guides the fluid but also promotes the propulsion thereof. Advantageously, means for stimulating the flexible baffle are provided, whereby the stimulation of the baffle 10 and of the membrane are in phase opposition to one another.

(21) Nevertheless, a rigid baffle may be used in other embodiments.

(22) In order to optimise the distribution of the fluid with respect to the membrane, the baffle or baffles 10 are disposed in parallel with the displacement of the wave along the membrane 2.

(23) Nevertheless, the baffle 10 may also be slightly inclined in order to distribute the fluid differently between the space located above the membrane 2 and the space located below or in order to account for the position of the fluid intake port 3 or of the discharge port 6.

(24) According to a feature of the invention, the baffle 10 is secured, directly or via connection elements, to the pump housing 4. Advantageously, the baffle 10 and the pump housing are integrally formed.

(25) With reference to FIG. 2, a circular fluid circulator 1 is shown, this type of circulator comprising a pump housing 4 and an undulating membrane 2, said membrane being disc-shaped. In this exemplary embodiment, a first baffle 10 in the form of a ring surrounding the membrane 2 at the upstream edge 8 thereof as well as a second baffle 10 disposed between the discharge port 6 and the downstream edge 9 of the membrane can be seen. The baffles 10 operate in the same manner as those provided for the membrane 2 in the form of a longitudinal strip shown in FIG. 1.

(26) It should be noted that, in other embodiments, at least two baffles 10 that are placed one above the other are provided upstream and/or downstream of the membrane 2. By way of example, with reference to FIG. 3, three baffles placed one above the other are shown. The use of a plurality of baffles 10 placed one above the other makes it possible to separate the main flow into a plurality of secondary fluid flows that flow one above the other and makes it possible to channel each of said flows in an improved manner in order to obtain laminar flows. This advantageous feature is particularly suitable if the cross-section of the propulsion chamber 5 is large in the region of the baffles.

(27) With reference to FIG. 4, a third type of circulator 1, i.e. a cylindrical circulator in which the undulating membrane 2 is tubular, is shown. In this type of circulator, guiding means 7 are also provided in the form of cylindrical baffles 10 disposed upstream and downstream of the membrane 2.

(28) In order to prevent transfer of fluid between the upstream baffle 10 and the upstream edge 8 of the undulating membrane 2 and between the downstream baffle 10 and the downstream edge 9 of the undulating membrane 2, the baffles 10 are disposed at a short distance from the edge of the undulating membrane 2, or from the support thereof connecting same to the actuator, advantageously less than one fiftieth of the length separating the upstream 8 and downstream 9 edges of the undulating membrane 2. In other words, the first guiding means 7a is disposed at a distance from the upstream edge of the membrane 2 of less than one fiftieth of the length separating the upstream 8 and downstream 9 edges. Similarly, the second guiding means 7b may be disposed at a distance from the downstream edge 9 of the membrane 2 of less than one fiftieth of the length separating the upstream 8 and downstream 9 edges.

(29) Nevertheless, in other embodiments, baffles that are further from the edges of the undulating membrane 2 may be used.

(30) With reference to FIG. 5, an alternative embodiment of a circulator 1 is shown. This variant comprises complementary guiding means 11, said complementary guiding means 11 being disposed in a plane perpendicular to a plane in which the first guiding means 7a extends and making it possible to prevent a circular motion of the fluid between the intake port 3 and the undulating membrane 2.

(31) In another embodiment (not shown), complementary guiding means 11 can also be disposed in a plane perpendicular to a plane in which the second guiding means 7b extends and they can also make it possible to prevent a circular motion of the fluid between the discharge port and the undulating membrane 2.

(32) As in the case of the guiding means 7a, 7b, the complementary guiding means 11 make it possible to increase the hydraulic power of the circulator 1.

(33) According to a particular feature, the complementary guiding means 11 are, as shown in FIG. 5, fastened to the first guiding means 7a; advantageously, the first guiding means 7a and the complementary guiding means 11 are integrally formed.

(34) Other features of the invention could also be envisaged without going beyond the scope of the invention defined in the claims below.

(35) Therefore, by way of example, in the different examples included in the description the guiding means 7a, 7b each consist of baffles 10, but in other embodiments different devices could be used to guide the flow, in particular by providing two separate flow inlets, each oriented towards the space above or below the membrane.

(36) In another embodiment, the guiding means 7a and/or 7b comprise heat transfer elements that make it possible to vary the fluidity of the fluid to be pumped and/or the temperature thereof. This embodiment of the guiding means is shown in FIG. 6, with heating elements 12 supported by the first guiding means. This example also features complementary guiding means 11 that also perform the function of heat diffusers, since they extend from the guiding means supporting the heating elements 12. Of course, the heat transfer elements supported by the guiding means 7a in this case comprise the heating means 12, but they may also comprise cooling means and/or a coolant circuit.

(37) In another embodiment shown in FIG. 7, the guiding means 7 are not connected to the pump housing 4 but are secured between the drive means 13 of the membrane and the membrane 2 itself. Accordingly, the first guiding means 7a is connected to a movable portion 14 of the drive means 13 via a spring-loaded connection, such that the first guiding means is guided in an elastically deformable manner relative to the movable portion 14.

(38) By connecting a guiding means 7a or 7b via a spring-loaded connection to the drive means 13 and, more specifically, to the movable portion 14 of the drive means 13, the movable portion 14 is both guided and cushioned by the guiding means 7a or 7b, which is immersed in the fluid. In order to do this, the first guiding means 7a consists of a baffle 10 in the form of a crown and comprising cut-outs 15 in the region of the connection to the movable portion 14 so as to give the connection the effect of a spring.

(39) In another embodiment shown in FIG. 8, the first guiding means 7a may be connected via a flexible connection 16a to the upstream edge 8 of the membrane 2, said first guiding means 7a, together with the membrane 2 and the flexible connection 16, forming a tight barrier between two different spaces of the propulsion chamber 5.

(40) In another embodiment shown in FIG. 8, the second guiding means 7b may also be connected via a second flexible connection 16b to the downstream edge 9 of the membrane 2, said second guiding means 7b, together with the membrane 2 and the second flexible connection 16b, forming a tight barrier between two different spaces of the propulsion chamber 5 separated from one another by the membrane 2.

(41) In other words, in the embodiment shown in FIG. 8, the guiding means 7a, 7b and the upstream 8 and downstream 9 edges of the membrane are connected to one another by first and second flexible connections 16a, 16b, respectively, making it possible to form a seal between the portion of the propulsion chamber located above the membrane and the portion located below. In this way, transverse flows of fluid between said two portions/spaces of the chamber are prevented during displacement of the wave along the membrane 2.