FR2564530A1 - Multi-stage supercharger device, made in one single piece - Google Patents

Abstract

Supercharging device with a plurality of supercharging stages connected in parallel between a low-pressure liquid inlet and a high- pressure liquid outlet 4, each stage comprising a pump 2a, 2b, two valves 3a, 3b for intake and delivery respectively, a non-return valve located at 5a, 5b in the delivery circuit and a supercharger body 1 in the form of a single closed housing supporting the above-mentioned elements at predetermined locations corresponding to two internal chambers for intake and delivery respectively connected to the above- mentioned liquid inlet and outlet.

Description

Multi-stage booster device, produced in one-piece form.

 The present invention relates to improvements made to booster devices with several overpressure stages connected in parallel between a low pressure liquid inlet and a high pressure liquid discharge, each stage comprising a pump, two suction and discharge valves respectively. , located respectively, with respect to the pump, in suction and delivery circuits, and the non-return valve located in the delivery circuit.

 The multi-stage booster devices currently used consist of a set of separate members connected together by a system of pipes ensuring the appropriate distribution of the liquid under low pressure on one side and the liquid under high pressure on the other side. known arrangements have a number of drawbacks; in particular, they require numerous constituent parts and long lengths of connecting pipes, hence a considerable number of fittings. I1 results in leaks ity, as well as time and high mounting costs; moreover, despite the possibility of prefabrication in the factory of certain sub-assemblies, a significant part of the assembly must be carried out in situ; Finally, due to the high risks of breakdowns, the times and costs of maintenance are also important, with, in addition, the discomfort that can cause the shutdown of a booster pump supplying water to a high-rise building by example.

 The invention therefore essentially aims to remedy the aforementioned drawbacks and to propose an arrangement of booster device which is easy and quick to assemble, which comprises only a reduced number of component members, which can be pre-assembled in the factory and easily transportable to its place of installation, therefore compact, which is reliable and easy and quick to maintain, and which, therefore, is inexpensive for both manufacturing and maintenance.

 For these purposes, a booster device according to the invention is characterized in that it further comprises a booster body in the form of a single closed casing on one of the walls of which the pump heads, tap heads and heads are fixed. the non-return valve in that this single casing comprises, for each stage, two suction chambers respectively for the liquid under low pressure and discharge for the liquid under high pressure as well as two suction and discharge conduits respectively for respectively connecting said suction and discharge chambers, respectively via the aforesaid suction and discharge valve bodies, to the inlet and outlet orifices, respectively, of the corresponding pump, said discharge conduit further extending via the location of the check valve head; in that there is provision for permanent communication between all suction chambers of all stages and a communication n permanent between all the discharge chambers of all the stages; and in that at least one inlet port for the liquid under low pressure is provided in at least one wall of the casing, in communication with the suction chambers, and at least one orifice for discharging the liquid under high pressure is provided in at least one wall of the casing, in communication with the discharge chambers.

 The use of a one-piece booster body ensuring all the connecting functions between the component organs of the booster device leads to eliminating all of the pipes, resulting in a substantial saving in materials and installation time and considerably increased reliability since most tight connections between organs and / or pipes are eliminated.

 The mounting of the booster device is also facilitated since the booster body constitutes a plate receiving the various members.

 It also results in substantial savings insofar as only the functional parts of these members can be mounted on the booster body, excluding individual casings or housings which are no longer necessary. It is thus possible to eliminate the pump bodies. valve and valves (only the heads of the valves and non-return valves are installed).

 Advantageously, all the pumps and all the valve heads are fixed to the same wall of the casing.

 Just as advantageously; the booster device has several inlet orifices for the liquid under low pressure and several discharge orifices for the liquid under high pressure; said orifices are associated by pairs - inlet orifice / evacuation orifice - distributed over walls Different from the casing, shutters are provided to close those of the orifices which are not used in a given mounting configuration of the booster device. Thus, the possibilities of implantation of the device as a function of the environment are facilitated, the inlet orifice and the evacuation orifice being able to be located on the same wall or else being able to be located on different walls, with in each case the choice between several walls.

 Likewise, for each overpressure stage, the wall of the casing is hollowed out to form a housing for receiving the head of the corresponding non-return valve, a shutter being provided to close this housing in the operating position of the device. Preferably then, all the receptacles for receiving the valve heads are grouped together on the same wall of the casing. Thus the valve heads are protected while being easily accessible for example for their replacement.

 Interestingly, the chambers, conduits, housings or the like are delimited by partitions internal to the casing, integral with the side walls, the casing being produced by molding. The booster body then constitutes a one-piece element, which can be molded from cast iron or any other suitable metal.

 Preferably, all of the booster stages have the same arrangement and configuration. The booster body is then formed by repeating the configuration of a booster stage. The development of the molds is thereby facilitated since it suffices to produce a mold for a two-stage booster device; the mold of a three-stage booster device will be obtained simply by adding to the previous one part corresponding to the third stage and easily transposable from the elements already produced. The establishment price of the molds is thus reduced very significantly.

 In general, an arrangement of booster device according to the invention, including a booster body as defined above, leads to a considerable reduction in mounting times and mounting errors. It will be noted that it is no longer necessary to carry out welds and that the assembly of the component members can be carried out by screwing: it is therefore no longer necessary to have recourse to qualified personnel for this operation. For example, it is possible to mount four devices according to the invention in one day when two days were necessary to mount a single analog booster produced according to ordinary criteria.

 The device of the invention can be assembled entirely in the factory and, thanks to its reduced size, transported while assembled at the place of use. In this location, the installation requires only the connection of two pipes (arrival of the liquid under low pressure and evacuation of the liquid under high pressure) and the electrical connection; these operations can be carried out for example in one hour, whereas for a conventional device a working day was necessary.

 Finally, it can also be mentioned that a booster device in accordance with the invention is less noisy than a conventional device, due to the presence of the suction and discharge chambers which act as buffers partly absorbing the vibrations generated. during operation.

The invention will be better understood on reading the following description of a preferred embodiment, given solely by way of non-limiting example. In this description, reference is made to the appended drawings in which
- Figure 1 is a schematic front view of a booster device arranged in accordance with the invention, certain members being simply shown diagrammatically in spectral line
- Figure 2 is a top view of the booster body of the device of FIG. 1, the other component members being assumed to have been removed;
- Figure 3 is a sectional view along the line
III-III of the booster body of fig. 2
- Figure 4 is a sectional view along the line
IV-IV of the booster body of FIG. 2; and
- Figure 5 is a sectional view along the line
VV of the booster body visible in FIG. 1, the other component members being assumed to have been removed.

 Referring first to fig. 1, the booster device of the invention, assumed to be with two overpressure stages in the example shown, comprises a booster body 1 constituting a closed casing, molded of cast iron for example, in the shape of a rectangular parallelepiped and of which a more detailed description will be given later.

 On the upper face of the booster body are mounted two pumps 2a, 2b, two heads of suction valves (not visible in this figure) and two heads of discharge valves 3a, 3b. On the left lateral face of the booster body are mounted two connection nozzles 4 for the arrival of the liquid under low pressure and for the evacuation of the liquid under high pressure. On the front face of the booster body are fixed sealing plates 5a, 5b, the utility of which will become apparent later. Finally, a table 6, attached to this assembly and overhanging for example the pumps 2a, 2b, groups together all of the command and control members necessary for the operation of the booster device.

The tap heads 3a, 3b, the pumps 2a, 2b and table 6, which may be of any design not within the scope of the invention, are only represented by their outline in spectral lines.

 Reference will now be made to FIGS. 2 to 5 which are various views of the booster body 1 devoid of the other members making up the booster device, and more particularly to FIGS. 3 to 5.

 FIGS. 3 and 4 are sections showing more particularly the overpressure stage situated to the left of lines A, B and C respectively in FIGS. 1, 2 and 5.

 Under the upper wall 7 of the booster body is an elongated shell 8 defining with the wall 7 a conduit 11. At one end of this conduit 11, an opening 9 is made in the wall 7 and an opening 10 is made in the bottom of the shell 8 opposite the opening 9, the openings 9 and 10 being able to receive a suction valve head. At its other end, the shell 8 is curved substantially at a right angle so that the duct 11 opens out through an orifice -12 situated approximately in the plane of the wall 7.

 The orifice 12 of the conduit 11 is surrounded, at least in part, by an annular or quasi-annular orifice 13 constituting the outlet of a conduit 14 delimited by the wall 7 and a shell 15 resting moreover on the shell 8. The orifices 12 and 13 approximately concentric (see fig. 5) are intended to cooperate with the inlet and outlet, arranged coaxially, of the pump 2a (fig. 1).

 The duct 14 is approximately bent at 90 "and opens into a housing 16 intended to house a non-return valve bearing on the bottom 17 of the housing. This housing opens on the front face 18 of the booster body and can be closed so sealed by a plate 5a visible in FIG. 1.

 From the underside of the housing 16 leaves a duct 19 curved in a semicircle, delimited by the front wall 18 of the booster body and by a shell 20 (fig.

3 and 4). The conduit 19 terminates in an orifice 21 situated opposite an orifice 22 formed, facing it, in the upper wall 7 of the booster body, the orifices 21 and 22 being intended to receive a head of a discharge valve ( 3a in fig. 1).

 Finally, a vertical wall 23, parallel to the wall 18, extends inside the booster body 1 approximately in the axis of the curved part of the duct 11. The wall 23 divides the booster body into two chambers: a suction chamber 24 (on the left in fig. 3) in communication with the suction duct 11 through the orifice 10 and a discharge chamber 25 (on the right in fig. 3) in communication with the suction duct discharge 19 through port 21.

 The above description relates to the arrangement of the overpressure stage located to the left of lines A, B, C, respectively in FIGS. 1, 2 and 5. The second booster stage (located to the right of said lines A, B, C in Figures 1, 2 and 5) is arranged in exactly the same way and will therefore not be described again. It will simply be noted that, as best seen in FIG. 5, the partition 23 which separates the suction and discharge chambers extends over the entire length of the booster body. In other words, the suction chambers and the discharge chambers of the two overpressure stages, respectively, in fact form only a single suction chamber and a single discharge chamber.

 Under these conditions, it is easy to design more powerful booster devices comprising a higher number of booster stages, by adding as many booster stages as necessary identical to the two stages of the booster represented in FIGS. 1 to 5.

 It is easy to produce the booster body of the invention by molding a suitable metal such as cast iron, no subsequent machining being necessary. The development of molds corresponding to blower bodies having different numbers of stages can be carried out at minimum cost, due to the very identity of all the stages: it is sufficient to produce a mold for a blower body with two stages, then, to obtain a booster body mold having a number of stages greater than two, to add to this initial mold as many identical cores as necessary.

To further increase the ease of mounting the booster device in various environments without modification or booster body, two orifices 34 and 26 are provided in one of the walls of ex
end 27 of the body and two other orifices 28 and 29 in the opposite wall 30 (fig. 2 or 5), the orifices 34 and 28 being in communication with the suction chamber 24, respectively at the two ends thereof, and the orifices 26 and 29 being in communication with the discharge chamber 25, respectively at the two ends of the latter. You can then select one of the holes 34 or 28 pirlarriveedu the liquid under low pressure and one of the holes 26 W 29 for eva
cuation of the liquid under high pressure, according to all possible combinations: either the inlet and the outlet located on the same wall
(E1, S1 or E3, S3 on fiq. 5), i.e. the arrival and the evacuation
located on opposite walls (E2, S2 or E4, S4 in fig. 5).

 In FIG. 1, the orifices 34 and 26 have been used and, for this purpose, a plate 31 carrying the necessary connection end pieces (such as the end piece 4 which is visible) - shown in dashed lines - is tightly fixed on the wall 27 by covering said orifices 25 and 26. As for the orifices 28 and 29 which are not used, they are sealed in a sealed manner by respective obturating plates (not shown) similar to the obturating plates 5 (visible in FIG. 1) closing the housings of the check valve heads.

 Finally, in FIGS. 3 and 4, the path of the liquid is shown by arrow lines during the operation of the booster device: the arrow line 32 shows diagrammatically the path of the liquid under low pressure (fig. 3), the arrow line 33 shows schematically the path of the liquid under high pressure (fig. 3 and 4).

 The assembly of the booster device is thus simplified to the maximum: it suffices to fix on the booster body 1 the various organs (in particular the pumps, the heads of valves, the heads of non-return valves, the various obturating plates, and the plates supporting the connection ends), for example by screwing in the tapped holes provided for this purpose (visible in the figures, but not referenced).

 This assembly is carried out in the factory, then the fully assembled device is transported to its place of installation where only the hydraulic connections are to be made on the two connection end pieces (such as 4) and the electrical connection of table 6.

 As is obvious and as it already follows from the above, the invention is in no way limited to those of its modes of application and embodiments which have been more especially envisaged, it embraces it, on the contrary, all variants.

Claims (7)

 1. Booster device with several overpressure stages connected in parallel between an inlet for liquid under low pressure and an evacuation of liquid under high pressure, each stage comprising a pump, two suction and discharge valves, respectively, located by relative to the valve, in suction and discharge circuits, and a non-return valve located in the discharge circuit, characterized in that it further comprises a booster body (1) in the form of a closed casing, single, on one (7) of the walls of which are fixed the pump heads (2a, 2b) the valve heads (3a, 3b) and the head of the non-return valve; in that this single casing (1) comprises, for each stage, two chambers (24, 25) respectively of suction for the liquid under low pressure and of discharge for the liquid under high pressure as well as two conduits (11; 14, 19) respectively suction and discharge for respectively connecting said suction and discharge chambers, respectively via the above said suction and discharge valve bodies, to the inlet and outlet orifices, respectively, of the corresponding pump , said discharge duct (14, 19) further extending via the location (16) of the non-return valve body; in that there is provided a permanent communication between all the suction chambers of all the stages and a permanent communication between all the discharge chambers of all the stages; and in that at least one orifice (34, 28) for arrival of the liquid under low pressure is provided in at least one wall (27, 30) of the casing, in communication with the suction chambers (24) and at at least one orifice (26, 29) for discharging the liquid under high pressure is provided in at least one wall (27, 30) of the casing, in communication with the discharge chambers (25).  2. Booster device according to claim 1, characterized in that all the pumps and all the valve heads are fixed on the same wall (7) of the casing.  3. Booster device according to claim 1 or 2, characterized in that it comprises several inlet orifices (34, 28) for the liquid under low pressure and several discharge orifices (26, 29) for the liquid under pressure high, in that said orifices are associated in pairs - inlet / outlet orifice (34, 26: 28,29) - distributed over different walls (27, 30) of the casing, and in this that shutters are provided for closing those of the orifices which are not used in a given mounting configuration of the booster device.  4. Booster device according to any one of claims 1 to 3, characterized in that, for each overpressure stage, the wall of the casing is hollowed out to form a housing (16) for receiving the corresponding non-return valve head. , a shutter (5) being provided for closing this housing in the operating position of the device.  5. Booster device according to claim 4, characterized in that all the housings (16) for receiving the valve body are grouped on the same wall (18) of the housing.  6, booster device according to any one of claims 1 to 5, characterized in that the chambers, conduits, housings or the like are delimited by partitions (8, 15, 20, 23) inside the casing, integral with the walls lateral (7, 18, 27, 30) and in that the casing is produced by molding.  7. Booster device according to any one of claims 1 to 6, characterized in that all the overpressure stages have the same arrangement and the same configuration.