FR3001503A1 - Transportable aspiration liquid device for removing aqueous phase contained in tank of compound vacuum truck, has chamber ensuring aspiration of liquid through opening and joint evacuation through outlet with pressurized water - Google Patents

Abstract

The device (1) has an inlet (2) intended to be connected to a flexible device (3) supplied with high pressurized water. An outlet (4) is intended to be connected to a liquids evacuation flexible device (5). An opening (6) is equipped with a filtration grid. A venturi system (7) allows usage of pressurized water supplied to the inlet to create depression in a depression chamber (9) internal to the device. The chamber ensures aspiration of liquid through the opening and joint evacuation through the outlet with pressurized water supplied to the inlet. An independent claim is also included for a vehicle.

Description

The present invention relates to a device for suction of a liquid, portable, using water under high pressure for its operation, and a vehicle, in particular a combined water purifier, equipped with such a device. The invention will find a particular application for extracting an aqueous phase contained in a tray. The field of the invention is that of the collection of liquid waste, or pasty. In this field, the skilled person knows vehicles for the collection of liquid or pasty waste contained in tanks, in sewer systems, or in bins.

These vehicles include a tractor whose self-propelled chassis supports a tank. This tank forms at least one compartment, called sludge tank, usually equipped with an opening bottom. This compartment cooperates with a vacuum pump and a suction pipe. The vacuum pump reduces the pressure in the compartment, lower than atmospheric pressure, and thus the suction of the product with the suction pipe whose end is immersed in the product to be pumped. Often the tank is divided into another compartment, intended to be filled with water and cooperating with a high pressure pump and a cleaning pipe. Such vehicles combining a suction function and a high pressure cleaning function are usually referred to as "scrubbers". Document FR2840234 A1 teaches such a vehicle. These vehicles are commonly used to empty the contents of bins. To do this, the operator plunges the end of the suction pipe into the tank and causes the suction of all its contents in the vehicle sludge tank. Often the contents of the tank comprise a light phase in the upper part, a heavy fraction and an aqueous phase, intermediate, in a significant proportion. Once the vehicle sludge tank is full, it is necessary to drive the vehicle to a specialized site equipped for the treatment of the waste in question. The sludge tank is then completely emptied.

However, and according to the findings of the inventor, the sludge tank of the vehicle is generally filled with a significant amount of water. This amount of water represents a significant weight that increases the fuel consumption of the vehicle. This amount of water increases the frequency of passage of vehicles to the specialized treatment site to empty the sludge tank and in fact decreases the vehicle's response capabilities. Thus, there has long been a need for a device which makes it possible to remove the aqueous phase contained in tanks, independently of the light phase and the heavy fraction, easily, quickly and compatible with the vehicles commonly used for emptying these tanks. . The object of the present invention is to provide such a device for suction of a liquid, portable, which allows to reject this aqueous phase directly into the sewer system, and without routing it into the sludge tank of the vehicle. More particularly, an object of the invention is to provide such a suction device not using the vehicle suction pipe and the sludge tank of vehicles of the state of the art to cause the suction of the aqueous phase. Another object of the invention is to provide such a device that prohibits or at least limits the release of undissolved organic matter in the sewer system.

Another object of the present invention is to propose a vehicle equipped with such a device. Other goals and advantages will become apparent from the following description which is given for information only and which is not intended to limit it. Also the invention relates to a device for suction of a liquid, portable, intended to be immersed in a liquid medium, comprising: - an inlet intended to be connected to a hose supplied with water under high pressure, - an outlet for to be connected to a liquid evacuation hose, - an opening equipped with a filtering grid, called the suction opening, intended to be immersed in a liquid medium, - a venturi system making it possible to use the pressurized water fed by said inlet to create a vacuum, in a chamber internal to the device, said vacuum chamber, ensuring the suction of the liquid through said opening and its joint evacuation through said outlet, with pressurized water supplied by said entry. Such a suction device can be connected directly to the high-pressure hose of the state-of-the-art water-treatment trucks. In order to proceed with the aspiration of the liquid, the suction opening of the device is immersed in the liquid (i.e. the aqueous phase of the tank) and the end of the discharge pipe is directed towards the sewer. The valve of the high pressure circuit of the vehicle is open which causes, by venturi effect, the suction of the liquid through the opening, and its evacuation together with the high pressure water supplied by the vehicle, in the pipe of evacuation of liquids. The suction hose and the sludge tank of the vehicle can be used previously or, in a subsequent step, to remove the light phase of the tank, and the heavy fraction of the tank. Such a device thus advantageously allows emptying the contents of the tanks, avoiding, or at least greatly reducing the amount of water sucked into the sludge tank of the vehicle.

The device may, in addition, have all or some of the following optional features: said device may have a casing, covering the suction opening and the filtering grid over the height of the device, partially at the level of the lower part of the device; said opening, when said suction device is immersed in a tank, the head of said device is oriented downwards, said casing being arranged to prohibit the direct pumping of a heavy fraction at said lower part, or alternatively - The head of said device is equipped with a stop intended to come into contact with the bottom when the suction device is immersed in a tray, the head of the device facing downwards, said stop being dimensioned to deport the position of the opening and filter grid, relative to the bottom, a determined distance; the device has an overflow arranged between said suction opening and said vacuum chamber, as well as a vent connected to a pipe, intended to pressurize the zone at said overflow and in such a way as to allow the overflow to occur; overflow and liquid flow in the vacuum chamber of the venturi system only if the liquid level in which said suction device is immersed is greater than the overflow level of said overflow; - The level of overflow of the overflow is at a level between 20 cm and 40 cm from the bottom, when the head of said device is oriented downwards, resting on the bottom; said venturi system comprises, on the one hand, a nozzle connected to said inlet and, on the other hand, a nozzle connected to said outlet, positioned in the axis of the nozzle, whose mouth is spaced apart from the nozzle via an inter-space where the depression is created, in said internal chamber to the device; - The jet created by the nozzle is substantially vertical, ascending, when the device is immersed in a liquid, the head of the device facing downwards; said suction opening and said filtering grid surround the venturi system, at least at said inter-space; the filtering grid has a filtration threshold of between 0.1 mm and 3 mm, for example 2 mm. The invention also relates to a vehicle, in particular a combined sewer cleaner, comprising: a reservoir cooperating with a high pressure pump, equipped with a high pressure hose, and possibly a second reservoir cooperating with a vacuum pump, equipped with a suction hose. According to the invention, the vehicle comprises a device for suction of a liquid, portable, according to the invention, said input is connected to said high pressure hose.

The invention also relates to the use of the suction device according to the invention or equipping the vehicle according to the invention to remove an aqueous phase contained in a tank, said tank containing, in addition to the aqueous phase, a light phase, and or a heavy fraction.

According to optional features of the invention: the aqueous phase is removed before the light phase or alternatively; the light phase is removed prior to the aqueous phase; the light phase, or even the heavy fraction, is removed by means of said suction hose of the vehicle according to the invention.

The invention will be better understood on reading the description accompanied by the appended drawings in which: FIGS. 1 and 2 are respectively front and side views of a suction device according to the invention in a embodiment, - Figure 3 is a view, in longitudinal section, of a device according to the invention according to a second embodiment, - Figure 4 is a top view of the device as shown in Figure 3, - Figure 5 is a view, in longitudinal section, of a device according to the invention according to a third embodiment, - Figures 6 to 9 show different stages of emptying a tray, implementing a suction device according to the invention, and a traditional suction pipe. Also the invention relates to a suction device 1 of a liquid, portable, intended to be immersed in a liquid medium, comprising: - an inlet 2, intended to be connected, in particular via a rotating connection, to a hose 3 fed with water under high pressure, - an outlet 4 intended to be connected to a liquid evacuation hose 5, - an opening 6 equipped with a filtering grid, called the suction opening, intended to be diving in liquid medium, - a 7.8 venturi system for using the pressurized water supplied by said inlet to create a vacuum, in a chamber internal to the device, called vacuum chamber 9, ensuring the suction of the liquid at through said opening 6 and its joint discharge through said outlet 4, with the pressurized water supplied by said inlet 2. Such a suction device can be connected directly to the high pressure hose of the truck s hydrocurers of the state of the art.

In order to proceed with the aspiration of the liquid, the suction opening of the device is immersed in the liquid (i.e. the aqueous phase of the tank) and the end of the discharge pipe is directed towards the sewer. The valve of the high pressure circuit of the vehicle is open which will cause, by venturi effect, the aspiration of the liquid through the opening, and its evacuation together with the high pressure water supplied by the vehicle, into the pipe of evacuation of liquids. The suction pipe and the sludge tank of the vehicle can be used beforehand or, in a subsequent step to remove the light phase and / or the heavy fraction of the tank. Such a device thus advantageously allows emptying the contents of all kinds of tanks, avoiding, or at least greatly reducing the amount of water sucked into the sludge tank of the vehicle. The filtering grid has the function of retaining the mineral or organic elements, light or heavy. For this purpose, the filtration grid may have a filtration threshold of between 0.1 mm and 3 mm, for example 2 mm.

As illustrated without limitation according to one embodiment, said venturi system can comprise on the one hand, a nozzle 7, connected by a rigid pipe to said inlet 2, and, on the other hand, a nozzle 8, connected to said 4, positioned in the axis of the nozzle 7, the mouth 80 is spaced from the nozzle via an inter-space It where the depression is created in said chamber 9 internal to the device. In operation, the jet created by the nozzle 7 is substantially vertical, upward, when the device is immersed in a liquid, the head of the device facing downwards, the jet engulfing in the mouth of the nozzle 8. When the liquid sucked through the suction opening 6 meets the jet, it is suddenly driven into the nozzle, allowing the evacuation of the liquid and water in the discharge hose 5.

The nozzle 8 may consist of a tubing, for example metal, having, from the mouth 80 a section of convergent length 81, followed by a section of length 82 of constant diameter, itself followed by a section of divergent length 83 whose end constitutes the outlet 4.

According to the embodiment, said suction opening 6 and said filtering grid surround the venturi system, at least at said inter-space It. This opening 6 and the filtering grid affect, according to one embodiment, the shape of a cylinder or, at the very least of a cylinder portion, of axis including coaxial with that of the nozzle 8.

According to an embodiment illustrated in Figure 3, the head of said device is equipped with a stop 10 intended to come into contact with the bottom when the suction device is immersed in a tray, the head of the device facing downwards . This stop is sized to deport the position of the opening 6 and the filter grid, relative to the bottom, by a determined distance d. This stop thus makes it possible to deport the position of the filtration grid of an area where the heavy fraction (i.e sediment settling) generally accumulates, thus avoiding clogging by the materials of this fraction. For this purpose the distance d determined can be between 5 cm and 15 cm, such as for example 10 cm. Alternatively, according to another embodiment illustrated in FIG. 5, said opening 6 and the corresponding filtering grid can extend almost to the bottom of the tank when the suction device 1 is immersed in a tank B, the head of the device pointing downwards. Advantageously, a casing 14, impervious, covers the suction opening 6 and the filtering grid from the outside over the height of the device, partially at the bottom of said opening 6 when the suction device is immersed in a tray, the head of said device facing down. The housing 14 is arranged to prohibit direct pumping of the heavy fraction at said lower part. This casing 14 has a lateral wall 15, in particular cylindrical, forming an obstacle for the heavy fraction, positioned spaced apart at a distance from the opening 6, as well as a bottom wall 16, extending the lateral wall 15 at the distal end of said device 1. The intermediate zone defined between the upper end 17 of the side wall 15 and the filtering grid of said opening 6, forms a passage 18, open upwards, in particular of annular shape, through which the liquids can engulf before being sucked through the opening 6 at its lower part. The housing 14 may cover the opening 6, from the bottom a distance, marked "d" in Figure 5, between 5 cm and 15 cm, for example 10 cm. According to an advantageous embodiment, illustrated in FIG. 3, the device may have an internal overflow 11 arranged between said suction opening 6 and said vacuum chamber 9, as well as a vent 12 connected to a pipe 13. intended to put under atmospheric pressure the area at said overflow 11. In operation the pipe 13 opens in the open air, above the level of the liquid.

Advantageously, this overflow 11 and this vent 12 will allow the overflow 11 to overflow by liquids sucked by the opening 6 and thus the flow of the liquid into the vacuum chamber 9 of the venturi system only if the level of liquid in which is immersed said suction device is greater than the overflow level Hd of said overflow 11. This provision is a safety that avoids pumping liquids near the bottom, often of poor quality, generally unsuitable for direct rejection to the network sanitation. The overflow level Hd of the overflow 11 may be at a level between 20 cm and 40 cm from the bottom, when the head of said device is oriented downwards, resting on the bottom. The overflow 11 may be constituted by a cylinder impervious to the liquid whose upper edge constitutes the overflow edge of said overflow 11, including axis coaxial with that of the nozzle 8. The invention also relates to a vehicle, in particular a combined purifier, comprising: - a reservoir cooperating with a high pressure pump, equipped with a high pressure hose 31, and optionally, - a second reservoir cooperating with a vacuum pump, equipped with a suction hose 41. Such a vehicle, as such, is known from the state of the art. The tank associated with the high pressure pump is intended to be filled with clean water.

This water under pressure, after opening a valve feeds the high pressure hose. This water is conventionally used for cleaning by pressurized water jet. The second tank, usually called "sludge tank" allows the collection of liquid or pasty waste. For this purpose the vacuum pump is used to reduce the pressure of the atmosphere in the second tank. One end of the suction hose opens into the tank, the other end being intended to be immersed in the product to be pumped. Under the depression, the product is sucked up to the second tank. The two tanks can be constituted by two compartments in the same tank.

According to the invention the vehicle comprises a device 1 for suction of a liquid, portable, according to the invention, said input 3 is connected to said high pressure hose 31. The suction device according to the invention or equipping the vehicle according to the invention has a particular application to remove an aqueous phase 20 contained in a tray B, said tank containing, in addition to the aqueous phase 20, a light phase 30 and / or a heavy fraction 40. Light phase is understood A liquid whose density is lower than that of the aqueous phase and a heavy fraction 40 a liquid, or even a solid, whose density is greater than that of the aqueous phase.

According to an embodiment illustrated in FIGS. 5 to 8, the device makes it possible to remove the aqueous phase 20 prior to the light phase 30. Thus the suction device 1 according to the invention is immersed in the tray and allows, as illustrated in Figures 5 and 6 to remove all or part of the aqueous intermediate phase. The light phase 30, or even the heavy fraction 40 and / or the residual water can be sucked simultaneously in a second time, in particular thanks to the suction hose 41 of the vehicle, to the second tank of the vehicle.

Alternatively, the light phase can be removed prior to the aqueous phase by skimming using the suction hose. In a second step, the suction device 1 according to the invention is then immersed in the aqueous phase which is then sucked, in whole or in part. The heavy fraction 40, or even the residual water will be removed via the suction hose of the vehicle, in a third time. In any case, the use of the suction device to remove the aqueous phase substantially reduces the volume and weight of the waste transported by the vehicle, collected in the second tank, and thus significantly increase the number of interventions between two emptying said second tank. The device according to the invention preferably has an elongate shape, preferably less than 1 m in length, preferably less than 300 mm in diameter. The weight of the device is preferably less than 8 kg.

Naturally other embodiments could have been envisaged without departing from the scope of the invention as defined by the claims below.

NOMENCLATURE 1. Suction device, 2. Inlet, 3. High pressure water hose, 4. Outlet, 5. Liquid drain hose, 6. Suction opening, 7. Nozzle (Venturi system), 8. Nozzle (Venturi system ), 9. Vacuum Chamber (Venturi System), 10. Stopper, 11. Overflow, 12. Event (Overflow), 13. Conduit, 14. Carter, 15. Sidewall (Carter), 16. Bottom Wall (Carter) , 17. Upper end (Side wall), 18. Through, 20. Aqueous phase, 30. Light phase, 40. Heavy phase, 41. Suction hose, 80. Mouth (Nozzle 8), 81. Convergent length section (Nozzle 8), 82. Section of constant diameter length (nozzle 8), 83. Section of divergent length (nozzle 8), B. Tank, d. Distance, Hd. Overflow level (Overflow).

Claims (14)

REVENDICATIONS1. Device (1) for suction of a liquid, portable, intended to be immersed in a liquid medium, comprising: - an inlet (2) intended to be connected to a hose (3) supplied with water under high pressure, - outlet (4) intended to be connected to a hose (5) for discharging liquids; - an opening (6) equipped with a filtering grid, called the suction opening, intended to be immersed in a liquid medium; a venturi system (7, 8) making it possible to use the pressurized water supplied by said inlet to create a vacuum, in a chamber internal to the device, called the vacuum chamber (9), ensuring the suction of the liquid through said opening (6) and its joint evacuation through said outlet (4), with pressurized water supplied by said inlet (2). 2. Device (1) according to claim 1, having a casing (14) covering the suction opening (6) and the filtering grid over the height of the device, at the lower part of said opening ( 6) when the head of said device is oriented downwards, said housing (14) being arranged to prohibit the direct pumping of a heavy fraction at said lower part. 3. Device (1) according to claim 1, wherein the head of said device is equipped with a stop (10) intended to come into contact with the bottom when the suction device is immersed in a tray (B), the head of the device facing downwards, said stop (10) being sized to deport the position of the opening (6) and the filter grid, relative to the bottom, by a distance (d) determined. 4. Device according to one of claims 1 to 3, having an overflow (11) arranged between said suction opening (6) and said vacuum chamber (9), and a vent (12) connected to a pipe (13), for putting under atmospheric pressure the area at said overflow (11) and so as to allow the overflow of the overflow (11) and the flow of liquid in the vacuum chamber (9) of the venturi system only if the liquid level in which said suction device is immersed is greater than the overflow level (Hd) of said overflow (11). 5. Device according to claim 4, wherein the level of overflow (Hd) of the overflow (11) is at a level between 20 cm and 40 cm from the bottom, when the head of said device is oriented downwards, in support on the merits. 6. Device according to one of claims 1 to 5, wherein said venturi system comprises firstly, a nozzle (7), connected to said inlet (2), and a nozzle (8), connected to said outlet ( 4), positioned in the axis of the nozzle (7), whose mouth is spaced apart from the nozzle via an inter-space (It) where the depression is created, in said internal chamber to the device . 7. Device according to claim 6, wherein the jet created by the nozzle (7) is substantially vertical, ascending, when the device is immersed in a liquid, the head of the device facing downwards. 8. Device according to claim 6 or 7, wherein said suction opening (6) and said filtering grid surround the venturi system, at least at said inter-space (It). 9. Device according to one of claims 1 to 8, wherein the filtering grid has a filtration threshold of between 0.1mm and 3 mm, for example 2 mm. 10. Vehicle, in particular a combined sewer cleaner, comprising: a reservoir cooperating with a high-pressure pump, equipped with a high-pressure hose (31), and optionally, a second reservoir cooperating with a vacuum pump, equipped with a suction hose (41), characterized in that the vehicle comprises a device (1) for suction of a liquid, portable, according to one of claims 1 to 9, said input (3) is connected to the high pressure hose (31). 11. Use of the suction device (1) according to one of claims 1 to 9 or equipping the vehicle according to claim 10 for removing an aqueous phase (20) contained in a tray (C), said tray containing, besides the aqueous phase (20), a light phase (30) and / or a heavy fraction (40). 12. Use according to claim 11 wherein the aqueous phase (20) is removed prior to the light phase (30). 13. Use according to claim 11 wherein the light phase (30) is removed prior to the aqueous phase (20). 14. Use according to claim 12 or 13 wherein the light phase (30) or even the heavy fraction (40) is removed by means of said suction hose (41) of the vehicle according to claim 10.