FR3051004A1 - FALL SECTION - Google Patents

Abstract

The invention proposes a drop section for a flow of liquid or fluids, in particular of water in a falling flow direction, comprising an upstream fall tubular element, a downstream fall tubular element, a diverting section between the upstream tubular downfall element and the downstream tubular downcomer, a connection with a flow connection element opening into the downstream tubular downstream element, the upstream tubular downcomer element, the tubular drop element downstream and the flow coupling member being substantially aligned in the falling flow direction, the falling section being characterized in that at least one of the upstream tubular downcomer, the tubular member of downstream, and the deflection section, in particular a tubular element thereof comprises an inner surface provided with first helical threads.

Description

Falling section The invention generally relates to pipes or drops for liquids with multiple arrivals, substantially in so-called "bi-phasic" applications and in particular water pipes such as sanitary falls in the building.

A fall is a vertical evacuation that serves one or more floors of the dwelling. In the upper part, the fall usually opens on the roof, which allows to ventilate the pipe and facilitate the flow of effluents. In the lower part, it ends with a fairly steep section that leads to either a collective sanitation network (mains drainage) or an individual sanitation system.

In so-called unitary falls, the various household or sanitary appliances are connected, and the noise of emptying household appliances or wastewater tends to be reflected by the walls of downpipes. Other constraints are related to the appearance of water plugs or overpressure, which can lead to a siphon defusing, with the resulting unpleasant odors, or gurgling and annoying noise.

In high buildings, these stresses are even more important, the height and the hydraulic flows being increased, by the multiplication of the number of stages also resulting in a greater number of sanitary appliances and a more important and frequent flow, and the height may lead to greater risks of depression or overpressure.

Tall buildings also have greater congestion requirements for pipes.

A solution has been provided by proposing an aerator connection, which eliminates the need for a secondary pipe for ventilation. The deflection fitting or pant has a coupling portion opening into the main chute, and a baffle or main fall deflection, deflecting the main flow of the chute, at the fitting portion. The connecting part and the baffle meet in the main chute, downstream of the connection. The baffle portion is in a curved shape. Such an example of an aerator connection is proposed for example by the company Akatherm under the trademark Akavent ™.

In order to improve the hydraulic performance, the document EP 2 447 424 also proposes an aerator connection in which the geometry of the baffle portion is modified. Thus, EP 2 447 424 proposes a pipe branch part, comprising an upper fall pipe section, a deflection section connecting to the upper fall pipe section, and a lower fall pipe section. connecting to the deflection section having an exit aperture, as well as at least one inflow section in the area of the deflection section. The deflection section includes a first deflection domain, deflecting the wastewater with respect to the falling direction, and a second deflection domain disposed downstream seen in a falling direction with respect to the first deflection domain. The second deflection range is inclined at an angle in the range of 2 to 12 °, with respect to the direction of fall, and makes an angle in the range of 30 ° to 50 relative to the direction of the wastewater diverted by the first deviation domain (8). Thus, the baffle section forms a spiral portion at the deflection, the spiral starting upstream of the connecting portion and opening downstream of the connecting portion in the main chute, thereby creating a hydraulic speed component promoting a vortex flow to improve the flow downstream of the fitting. Such a geometry is not easily reproducible especially for the assembly of the fall during assembly, and also has an undesired size.

An object of the present invention is to improve the falling flow characteristics.

Another object of the present invention is to obtain a compact hydraulic drop. For this purpose, according to a first aspect, the invention proposes a drop section for a flow of liquid or fluids, in particular of water in a falling flow direction, comprising an upstream tubular falling element, a tubular element of downstream chute, a deflection section between the upstream downstream tubular element and the downstream downstream tubular element, a connection with a flow connection element opening into the downstream downstream tubular element, the tubular drop element upstream, the downstream tubular downstream member and the flow coupling member being substantially aligned in the falling flow direction, the falling section being characterized in that at least one of the tubular member of upstream chute, the downstream tubular downstream element, and the outflow section, in particular a tubular element of the latter comprises an inner surface provided with first heli nets coïdaux.

Therefore, the invention is mainly related to so-called bi-phasic applications. In these applications, a fluid or liquid must pass through the falling element to create liquid plugs. To do this, it is advantageous to provide a complementary circulation of the other phase. In a wastewater application for example, it is therefore possible to initiate or maintain a column of air. This results in an improvement and an option of adaptation of the water flow to arrive at an optimization of the management of the bi-phasic mixture air-water in the deviation making it possible to ensure a circulation of air between the upstream and the downstream of said drop section. Indeed, it has been surprisingly found that the maintenance of a column of air is possible during the deviation by providing only helical threads on one or more of the cylindrical portions. Of course, an optimization will take into account adequate lengths of these helical thread presences by respecting deflection or deflection angles without, however, increasing the size of the system since there is no need for an intervention on the geometry. externally, although of course such an adaptation remains possible in addition or option.

In one aspect, the upstream fall tubular member, the downstream fall tubular member, and the flow lead member and the offset section are substantially aligned in a plane parallel to the fall flow direction. In a particular embodiment, the upstream downstream tubular element and the downstream downstream tubular element will be placed in registry relative to each other.

According to one aspect, the deflection section comprises a first deflection portion in the extension of the upstream tubular falling element and inclined relative to the upstream tubular fall element, a second off-axis part in the extension of the first part. deviation is substantially parallel to the direction of flow of fall, and a third deviation part downstream of the second deviation part and opening into the downstream tubular downstream element. The elements constituting the entire fall section may be largely standardized elements for such applications. The primary adaptation being helical threads on the inner surface, preferably with an inclination of the turns of about 15 ° to 30 ° and preferably with lengths sufficient to create or maintain a column of air - lengths that will be adapted case by case to because of the flow velocities and volumes as well as the diameters invoked.

In one aspect, the second offsetting portion includes an inner surface provided with second helical threads, in particular the second portion being cylindrical.

In one aspect, the third deflection portion forms an angle with the second fitting portion in the range of 20 to 40 °, in particular 30 °.

In one aspect, the first deflection portion forms an angle with the upstream fall tubular member in the range of 30 to 60 °, in particular 45 °.

In one aspect, the first deviation portion forms an angle with the third deviation portion greater than 90 °, particularly with respective different angles with respect to the tubular elements resulting in asymmetric deviation. It can therefore be seen that the flow of the liquid or fluid is rotated by the turns of the helical threads and a deflection only in the presence of obtuse angles so that the optimization of the bi-phasic mixture is of a kind. to guarantee the existence of an air column irrespectively of the flow possibly being created only very occasionally.

In one aspect, the flow coupling member has an inner surface with third helical threads.

In one aspect, at least two of the first helical threads, the second helical threads and the third helical threads have the same thread pitch and / or the same thread orientation. In doing so, the continuity of the optimization is possible and, at the same time, it is conceivable to adapt the pitch and the orientation for an adaptation to the deviations. Alternatively, it is also possible to envisage variable steps or orientations, for example a progressively tighter or spaced step to provide for a more or less significant fluid or liquid rotation, and / or to provide for a more or less slowdown. important flow generally or punctually in well-localized locations.

In one aspect, at least two of the first helical threads, the second helical threads and the third helical threads have the same spacing between threads.

According to one aspect, at least a portion of the helical threads has an inclination with respect to a direction in which the tubular element having said helical threads of about 20 °, in particular forming an angle of less than 30 ° with the angles present in the deviation from the vertical.

In one aspect, the flow coupling member has an inner surface with third helical threads.

In one aspect, the connector is an aerator connector with a pressure balancing connector element opening into the deflection section. It should be noted that usually such a connecting element is formed by an air intake valve and that in any case such an element remains purely optional knowing that the air column persists in the deviation and, therefore, overpressure should not occur under any circumstances.

According to another aspect of the invention, it is proposed a chute comprising one or more drop section (s) according to the first aspect or according to a preferred embodiment as defined in the present application. Other features and advantages of the present invention will emerge from the description given hereinafter with reference to the accompanying drawings which illustrate an example of embodiment without any limiting character, among which: - Figure 1 illustrates a section of a fall according to a embodiment of the present invention;

Fig. 2 illustrates a drop section according to another embodiment of the present invention; FIG. 3 illustrates a drop section according to another embodiment of the present invention; FIG. 4 illustrates a drop section according to another embodiment of the present invention; - Figure 5 illustrates a fall according to an embodiment of the present invention.

In the drawings, identical or similar elements are indicated with identical or similar reference numbers. In FIGS. 1 to 4, the drop sections are respectively shown in partially exploded view, on the side and in isometric view with partial detents.

Figure 1 illustrates a drop section 1 according to an embodiment of the present invention. The chute section 1 is shown for effluent flow in a falling flow direction. The fall flow direction is substantially vertical for a fall, as implemented on a construction site.

The chute section 1 comprises an upstream tubular downstream element 10, a downstream tubular downstream element 15, a deflection section 20 between the upstream tubular downstream element and the downstream tubular downstream element, and a connection 30 for the downstream tubular element. connection or the secondary drain connection on the chute section.

The coupling 30 is of the aerator coupling type, with a venting connection element and / or pressure balancer 34 and a flow coupling element 38. The flow coupling element 38 opens into the tubular element of downstream fall 15, for the connection of secondary effluents in the main chute. The pressure balancer connection element opens into the outflow section 20, to balance the pressure in the outflow section 20 and in the flow connection element 38. The upstream tubular downstream element 10, the element Downstream tubular downstream 15 are substantially aligned in the direction of fall flow. Furthermore, the upstream tubular downstream element 10, the downstream tubular downstream element 20 and the outflow section 20 are substantially in the same plane, which parallels the direction of flow of fall.

The deflection section 20 forms a baffle for diverting the flow coming from the chute at the fitting 30. The deflection section comprises a first deflection portion 22 in the extension of the tubular upstream falling element 10 and inclined relative to the tubular upstream fall element 10, a second deviation portion 24 in the extension of the first deviation portion 22 and substantially parallel to the direction of flow of fall, and a third deviation portion 26 downstream of the second part deviation 24 and opening into the downstream tubular downstream element 15.

In FIG. 1, the third deviation portion 26 forms an angle with the second coupling portion 38 in the range of 20 to 40 °, in particular 30 °.

In the embodiment illustrated in FIG. 1, the upstream fall tubular element 10 comprises an upstream internal drop face 60 provided with first helical threads 61.

The first helical threads 61 serve to put the effluents in rotation, which plates them against the inner surface 60, and allows the formation of a column of air in the center of the pipe.

The first helical threads thus break the water piston which tends to form. In other words, the first helical threads 61 serve to initiate a vortex for the effluents for the passage in the deflection section, that is to say that the inner surface of the upstream tubular element 10 ensures a good flow at the branching zone of secondary effluents to be connected to the main pipe via the connection 30, for example at each level of a building

In addition, the first helical threads slow down the flow of water upstream of the deflection, and thus contribute to the hydraulic characteristics of the system. This makes it possible to favor the fluidic and hydraulic behavior, by leaving the free fall trajectory of the effluents. Hydraulically, a vortex is thus created with an internal column of air that is also present inside the deviation since the slowdowns induced by these are initiated or accompanied by the slowing down and the introduction of a spiral speed component. helical threads. This results in an improvement and an option of adaptation of the water flow to arrive at an optimization of the management of the bi-phasic mixture air-water in the deviation making it possible to ensure a circulation of air between the upstream and the downstream of said drop section.

Figure 2 shows a fall section 201 according to another embodiment of the invention. The embodiment of FIG. 2 differs essentially from the embodiment of FIG. 1 in the presence of helical diverting threads in the deflection section. The identical elements between Figure 1 and Figure 2 have the same reference number and are not described again.

The deflection section 220 comprises a first deflection portion 222 in the extension of the upstream tubular fall element 10 and inclined relative to the tubular upstream fall element 10, a second deviation portion 224 in the extension of the first deflection portion 222 and substantially parallel to the direction of flow of fall, and a third deviation portion 226 downstream of the second deviation portion 224 and opening into the tubular downstream falling element 15.

According to the embodiment of Figure 2, the second deviation portion 224 has an inner surface provided with second helical threads 261 deviation.

Thus, in the embodiment of FIG. 2, the upstream fall tubular member 10 and the second off-set portion 224 each have an inner surface with helical threads.

Thus, unlike the systems of the prior art, in which the effluents are rotated through a spiral-type deflection section, rotating about the longitudinal axis of the chute section, the present invention provides to use a drop section in which the vortex effect is created by the internal surfaces of the elements. By providing second helical threads 261 in the deflection section 20, in addition to the first helical threads 61, continuity of the thus-formed vortex is provided, which improves flow and hydraulic and acoustic performance.

Preferably, the first helical threads 61 and the second helical threads 261 have the same thread pitch and the same thread orientation, and / or the same spacing between threads, to ensure vortex continuity.

Preferably, the nets are continuous.

Figure 3 shows a fall section 301 according to another embodiment of the invention. The embodiment of FIG. 3 differs essentially from the embodiments of FIGS. 1 and 2 by the presence of helical deviation threads in the coupling element. The identical elements between Figure 1 and Figure 3 have the same reference number and are not described again. In FIG. 3, the drop section 301 comprises a connection 300, of the aerator connection type, with a pressure balancing connection element 334 opening into the deflection section 20 and a flow connection element 338 opening into the element tubular downstream fall. In the embodiment of FIG. 3, the secondary effluent flow connection element 38 comprises an inner surface provided with third helical threads 361.

FIG. 4 represents an embodiment combining the embodiments of FIGS. 1 to 3, that is to say a drop section 401 in which the upstream falling element 10 has first helical threads on its inner surface, the deflection section 220 has second helical threads 261 on its inner surface, and the flow coupling member 338 also has third helical threads 361.

Preferably, at least two of the first helical threads 61, the second helical threads 261 and the third helical threads 361 have the same thread pitch and the same thread orientation, and / or the same thread spacing.

Preferably, the nets are continuous.

Fourth helical threads 64, 264, 364 may also be provided on the inner surface of the downstream tubular downcomer.

The elements of upstream, downstream, the deviation section are preferably obtained by extrusion or injection of thermoplastic material, rigid PVC monolayer type. A mineral filler can be added for the acoustics of the fall section.

The drop elements may otherwise comprise a rigid outer sleeve and an acoustic sleeve, in contact with the effluents conveyed by the pipe. The rigid outer sleeve is rigid PVC, lightened or not, and the acoustic sleeve can be made of plasticized PVC loaded. Fireproof additives may also be provided for the rigid outer sleeve and / or the acoustic sleeve. The addition of biocides preventing the degradation of plasticizers is also possible.

FIG. 5 illustrates a unitary sanitary fall 90 which starts from the upper floor of a building to cross all the floors and then the ground floor to lead into the collector provided in the basement.

The chute comprises drop sections according to the embodiments of Figures 1 to 4, connected in series.

The appliances are connected to the chute, via the connections 30, for the flow of secondary effluents via the flow connection element 38.

Thus, thanks to the combination of an optional connection with aerator, in which helical threads can be provided, with helical threads upstream of the connection, it limits the problems of depression and desiphoning which could result, the problems of overpressure resulting in gurgling and noise, while maintaining a compact system requiring only one perforation in the slab.

Claims (13)

claims 1. Falling section (1; 201; 301) for a flow of liquids or fluids, in particular water in a falling flow direction, comprising an upstream tubular falling element (10), a tubular falling element downstream (15), a deflection section (20; 220, 320) between the upstream tubular downcomer and the downstream tubular downcomer, a connection with a downcomer (38; 338) opening into the downstream tubular downcomer, the upstream downstream tubular member (10), the downstream tubular downstream member (15), and the flow coupling member (38) being substantially aligned in the flow direction of characterized in that at least one of the upstream downstream tubular element (10), the downstream tubular downcomer (15), and the outflow section (20; 220, 320), particularly a tubular element (24, 224, 324) of the latter comprises an inner surface provided with helical threads. 2. Falling section according to the preceding claim, wherein the upstream tubular downstream element (10), the downstream tubular downstream element (15) and the flow connection element (38; 238, 338) and the deflection section (20; 200, 300), in particular the tubular element (24, 224, 324) thereof, is substantially aligned in a plane parallel to the direction of flow of fall. 3. Falling section according to one of the preceding claims, wherein the deflection section (20; 220, 320) comprises a first deflection portion (22; 222, 322) in the extension of the upstream tubular falling element. (10) and inclined with respect to the upstream tubular fall element, a second deflection portion (24; 224, 324) in the extension of the first deflection portion (22; 222, 322) and substantially parallel to the direction falling flow, and a third deflection portion (26; 226,326) downstream of the second deflection portion (24; 224,324) and opening into the downstream tubular downcomer (15). The chute section of claim 3, wherein the second deflection portion (224) comprises an inner surface provided with second helical threads (261), in particular the second portion being cylindrical. The drop section according to claim 3 or 4, wherein the third deflection portion (26; 226,326) forms an angle with the second fitting portion (38) in the range of 20 to 40 °, in particular 30 °. The chute section according to one of claims 3 to 5, wherein the first deflection portion (22; 222; 322) forms an angle with the upstream tubular fall element (10) in the range of 30 to 60 °, in particular 45 °. The chute section according to one of claims 3 to 6, wherein the first deflection portion (22; 222; 322) forms an angle with the third deflection portion (26; 226,326) greater than 90 °. in particular with respective different angles with respect to the tubular elements resulting in an asymmetrical deviation. 8. Falling section according to the preceding claim, wherein at least two of the first helical threads (61), the second helical threads (261) and the third helical threads (361) have the same thread pitch and / or the same net orientation. Drop section according to one of claims 4 to 8, wherein at least two of the first helical threads (61), the second helical threads (261) and the third helical threads (361) have the same spacing between threads. . Falling section according to one of the preceding claims, wherein at least a portion of the helical threads (61, 261, 361) has an inclination with respect to a direction in which the tubular element having said helical threads (61, 261, 361) of about 20 °, in particular forming an angle of less than 30 ° with the angles present in the deviation from the vertical. The chute section of one of the preceding claims, wherein the flow coupling member (338) has an inner surface with third helical threads (361). 12. Falling section according to one of the preceding claims, wherein the connection is an aerator connection (30; 330) with a pressure balancing connection element (34; 334) opening into the deflection section. 13. chute (80) comprising a chute section (1) according to one of the preceding claims