WO2017168080A1

WO2017168080A1 - Modular pump housing

Info

Publication number: WO2017168080A1
Application number: PCT/FR2017/050698
Authority: WO
Inventors: Khaled Abou-Saleh
Original assignee: Pulssar Technologies
Priority date: 2016-03-29
Filing date: 2017-03-27
Publication date: 2017-10-05
Also published as: FR3049659B1; US20190107107A1; FR3049659A1; EP3436701A1; EP3436701B1; CN108884827A; CN108884827B

Abstract

The invention relates to a modular pump housing 10 comprising: a pumping chamber 26, substantially cylindrical about a pumping axis and comprising an opening for the insertion of a piston and a base opposite the opening; a face suitable for attaching a fluid interface 12 thereto; and a conduit 29 connecting the base with the face. Using a process according to the invention, the diameter of the chamber can be selected during manufacture without changing the external measurements of the body. A solenoid valve 11 can be attached using the fluid interface. If a solenoid valve is not used, an additional conduit is provided through a sidewall of the chamber for connecting the latter with the fluid interface.

Description

MODULAR PUMP BODY,

The present invention relates to the field of piston pumps used in automatic sampling, including syringe type pumps used for taking a blood sample for analysis by an automatic device. Patent FR 2 974 155 describes such pumps.

However, these pumps are particularly expensive to manufacture, since they must be manufactured in different configurations, depending on the pumping volume required and whether they are equipped with a solenoid valve or not.

The object of the invention is to propose means for manufacturing reliable pumps at low cost. To achieve its purpose, the invention proposes a pump body characterized in that it comprises:

a substantially cylindrical pumping chamber around a pumping axis comprising an opening for axially introducing a piston and a bottom axially opposite to the opening; a connecting face, preferably substantially flat, preferably parallel to the axis;

an angled duct connecting the bottom with this face; and,

means for fixing a fluidic interface against the face.

The means for fixing the interface may be free of tapping, and preferably, are smooth bores.

Advantageously, the pump body comprises a base and means for fixing said base on a frame. The fixing means of the base may be free of tapping, and preferably are smooth bores.

The body may further comprise a lateral duct connecting a side wall of the chamber with the connecting face.

The invention also relates to a family of pump bodies according to the invention, characterized in that it comprises a plurality of pump bodies having identical external dimensions, each pump body having a specific chamber diameter.

The invention also relates to a pumping assembly characterized in that it comprises a pump body according to the invention and a fluid interface fixed on the connection face of the body. Such a pump assembly may comprise a pump body having a lateral duct connecting a side wall of the chamber with the connection face, a fluidic interface and a solenoid valve fluidly connected to the connection face via the interface.

The invention also relates to a pump comprising a pump assembly according to the invention. The invention also relates to a method for manufacturing a pump body from a family according to the invention, characterized in that:

a single external mold is used;

a chamber core corresponding to a desired chamber diameter is chosen; and,

- We choose or not to use a core to achieve a lateral duct.

Several embodiments of the invention will be described below, by way of non-limiting examples, with reference to the appended drawings in which:

Figure 1 is a perspective view of an assembly comprising a pump body according to a first embodiment of the invention and a solenoid valve fixed on the pump body;

Figure 2 is an elevational view and front view of the pump body of Figure 1;

Figure 3 is a longitudinal section, in elevation, along the plane III-III of Figure 2, the assembly of Figure 1;

Figure 4 is a view similar to that of Figure 3, wherein the pump body comprises a chamber of a diameter smaller than that of the chamber of Figure 4;

Figure 5 is a perspective view of a pump body according to a second embodiment of the invention, without solenoid valve;

Figure 6 is a view similar to the perspective view of Figure 5, in which the body is further shown cut longitudinally along the plane VI-VI of Figure 7;

Figure 7 is a front view and in elevation of the pump body of Figure 5;

Figure 8 shows four sections according to VI-VI, each of a pump body with a respective chamber diameter; and,

FIG. 9 illustrates a pump equipped with a body according to the invention. In the description, the terms vertical and front, in particular, are assigned arbitrarily, depending on the layout of the main figures. These terms are not limiting, and the elements described may have a different layout when implemented on a device.

FIGS. 1 to 4 illustrate a pump body 10 intended to be mounted with a solenoid valve 11 on a pump 100. In the example illustrated, an interface piece 12 provides a fluid connection between the body 10 and the valve 11. interface piece can be an independent piece, it can be an integral part of solenoid valve 11.

The body 10 is in a substantially cylindrical shape, of diameter D10, around a vertical axis XI 0. This cylindrical shape is truncated in an upper portion 14 by two flats forming two opposing faces 15, 16, planar, vertical and parallel to each other. The X10 axis is equidistant from both sides 15,16.

Under the upper part 14, the body comprises a substantially cylindrical base 17 around the axis X10. The upper portion 14 extends vertically upwardly from the base 17. The thickness E17 of the base is small relative to the total height H10 of the body and to the diameter D10 of the body.

In the illustrated example, E17 <H10 / 4, and, E17 <D10 / 4. The base comprises, on either side of the upper part, bores 18 through vertically the base. As illustrated in FIG. 9, these bores 18 are designed to fix and position the body 10 on a central part 40 of the pump 100.

With this arrangement, it is not necessary that the body includes tapping to fix it on a frame. Bores 19 are formed in the upper part 14 of the body, perpendicular to the opposite faces 15,16.

The solenoid valve 1 1, via its interface 12, is fixed on a front face 15, among the opposite faces 15, 16, of the body 10, so that it extends horizontally from this front face 15 The interface 12 has a substantially rectangular vertical section. It comprises a front vertical face 21, against which is fixed the electro valve 11, so that the latter extends horizontally from the front face 21 of the interface 12. The electro valve 11 has a substantially rectangular vertical section , substantially identical to that of the interface, so the interface and the electro valve form a set of substantially constant vertical section, in the extension of one another. A counter-piece 22 is fixed against the rear face 16, among the opposite faces 15, 16, of the body 10. Each bore 19, formed in the upper part 14 of the body, is arranged so that it opens on the one hand on the front face 15, vis-à-vis the interface 12, and, secondly, in the face on the rear face 16, vis-à-vis the against-piece 22. Each bore 19 is further formed to fit therein a fixation rod, not shown in the figures. Each rod passes through the body 10, keeping it pinched between the interface 12 and the counterpart 22, fixing them to the body. With this arrangement, it is not necessary for the body to include tapping to fix the interface 12 and / or the counterpart 22.

The body further comprises a pumping chamber 26, substantially cylindrical about the axis X10. The chamber comprises an opening 25 in a lower face 27 of the body, so as to introduce a piston 41, shown in Figure 9. The chamber extends through the base 17 into the upper part 14 of the body 10 It includes one end upper 28 of frustoconical shape, forming a bottom 28 axially opposite the opening 25. The diameter of the frustoconical bottom 28 is decreasing upwards. The body 10 further comprises an angled conduit 29 fluidly connecting the top of the upper end 29 of the chamber with the front face 15 of the body, and beyond, with the fluid interface 12. The conduit 29 serves both intake and exhaust for a fluid in the pumping chamber 26. The fluid distribution is provided by the electro valve 11. The chamber 26 has a main diameter D26, measured in the portion provided for the sliding of the piston 41 and a height H26, measured between the lower face 17 of the base 17 and the base of the frustoconical end 28.

As illustrated in FIGS. 3 and 4, a width L14 of the body, between the two faces 15, 16 of its upper part 14, is provided for chambers of several diameters D26 of chambers. As illustrated, for the same width L14, the diameter D26 of the chamber 26 of Figure 4 is smaller than that of the chamber 26 of Figure 3. Thus, for identical external dimensions, one can manufacture several bodies with volumes. different rooms, each adapted to a specific use. The chambers 26 of FIGS. 3 and 4 also have the same height H26. Thus, only the diameter of the piston must be adapted to the diameter D26 of the chamber, the possible stroke of the piston in the chamber remaining substantially the same. Thus, to modify the pumping volume in a pumping device 10-12, it is sufficient to modify the piston / pump body torque, the rest of the device being identical.

We will now describe a second embodiment for a body according to the invention, in that it differs from the previous embodiment, with reference to Figures 5 to 9. In Figures 5 to 9, the body 10 is provided to be mounted without solenoid valve. Thus, in addition to the bent duct, it comprises a lateral duct 30, connecting a side wall 32 of the chamber, in the cylindrical zone of main diameter D26, with the front face 15. The interface 12 used in this second embodiment is adapted to extend each of the conduits 29, 30 by respective conduits 34, 35, in order to connect them to the rest of the apparatus. The chamber is thus connected with the front face 15 by two ducts, one serving for the admission of fluid into the chamber, the other duct serving to exhaust the fluid. The interface 12 used in this second embodiment is fixed by two screws passing through the bores 19.

As illustrated in FIG. 8, and as previously described with reference to FIGS. 3 and 4, it is possible to produce a family of pump bodies each having a different chamber volume, only by modifying the diameter D26 of the chamber 26. In FIG. the example illustrated in Figure 8, the family comprises four pump bodies 10, adapted to operate without solenoid valve, each having a specific chamber diameter D26.

Thus, the body 10 of the second embodiment, illustrated in Figures 5 to 8 differs from the body according to the first embodiment, illustrated in Figures 1 to 4, only in that it comprises a second conduit 30 formed in a side wall from bedroom 26.

According to the invention, it is therefore possible to manufacture pump assemblies with or without a solenoid valve, having specific chamber volumes, but whose pump bodies 10 all have the same external dimensions D10, H10, L14. To manufacture such a pump body 10, it suffices to have a single outer mold, and a first specific core adapted to form a chamber of a given diameter D26 and a core used only to make the side duct, if necessary. The other cores are preferably identical regardless of the type of pump body 10.

In addition, the body being fixed by bores, without tapping, it can be manufactured by molding more accurately and cheaply. Indeed, the molding of a tapping is a complex operation; poor material filling around the mold core for tapping produces break-in primers in the injected material, which decreases the reliability of the workpiece thus manufactured, and can lead to many parts being re-bounced, which increases the cost of manufacture.

Of course, the invention is not limited to the preferred embodiments which have just been described but, on the contrary, the invention is defined by the following claims.

It will be apparent to those skilled in the art that various modifications can be made to the embodiments described above, in the light of the teaching that has just been disclosed. Thus, the connection face may have a shape other than planar, provided that it can be mounted with sealing against the interface. It can be cylindrical or spherical. A planar connection face may comprise a flat surface and recesses adapted to allow manufacture by molding, in particular to avoid excessive wall thicknesses.

Claims

claims

Pump body (10), characterized in that it comprises:

- a substantially cylindrical pumping chamber (26) around a pumping axis (X10) comprising an opening for axially introducing a piston and a bottom (28) axially opposite said opening;

- A connection face (15), preferably substantially planar, preferably parallel to said axis (X10);

- an angled duct (29) connecting said bottom (28) with said face (15); and - means (19) for fixing a fluidic interface (12) against said face (15).

2. Pump body according to claim 1, characterized in that the fastening means (19) of the interface (12) are free of tapping, and, preferably, are smooth bores.

3. Pump body according to one of claims 1 and 2, characterized in that it comprises a base (17) and means (18) for fixing said base on a frame.

4. Pump body according to claim 3, characterized in that the fastening means (18) of the base (17) are free of tapping, and, preferably, are smooth bores.

5. Pump body according to one of claims 1 to 4, characterized in that it further comprises a lateral duct (30) connecting a side wall (32) of the chamber (26) with the connecting face (15). ).

6. Pump body family according to one of the preceding claims, characterized in that it comprises a plurality of pump bodies having identical outer dimensions, each pump body having a specific chamber diameter (D26).

7. Pumping assembly, characterized in that it comprises a pump body (10) according to one of claims 1 to 5 and a fluid interface (12) fixed on the connection face (15) of said body.

8. Pumping assembly, characterized in that it comprises a pump body (10) according to one of claims 1 to 4, a solenoid valve (11) fluidly connected to the connection face (15) of said body by said interface (12).

9. Pumping assembly according to claim 8, characterized in that the fluidic interface is an integral part of the solenoid valve.

10. Pump (100) characterized in that it comprises a pump assembly according to one of claims 7 to 9.

11. A method for manufacturing a pump body from a family according to claim 6, characterized in that:

a single external mold is used;

a chamber core corresponding to a desired chamber diameter (D26) is chosen; and,

- One chooses to use or not a core to achieve a lateral duct (30).