WO2016150980A1 - Vanne de curage par pulsion - Google Patents

Vanne de curage par pulsion Download PDF

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Publication number
WO2016150980A1
WO2016150980A1 PCT/EP2016/056295 EP2016056295W WO2016150980A1 WO 2016150980 A1 WO2016150980 A1 WO 2016150980A1 EP 2016056295 W EP2016056295 W EP 2016056295W WO 2016150980 A1 WO2016150980 A1 WO 2016150980A1
Authority
WO
WIPO (PCT)
Prior art keywords
gate
fluid
closed position
housing
movable
Prior art date
Application number
PCT/EP2016/056295
Other languages
English (en)
Inventor
Neil Stutchbury
Ross LAMONBY
Original Assignee
Reece Innovation Centre Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GBGB1504808.5A external-priority patent/GB201504808D0/en
Priority claimed from GBGB1520768.1A external-priority patent/GB201520768D0/en
Application filed by Reece Innovation Centre Limited filed Critical Reece Innovation Centre Limited
Publication of WO2016150980A1 publication Critical patent/WO2016150980A1/fr

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F9/00—Arrangements or fixed installations methods or devices for cleaning or clearing sewer pipes, e.g. by flushing
    • E03F9/007—Devices providing a flushing surge
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B7/00—Barrages or weirs; Layout, construction, methods of, or devices for, making same
    • E02B7/20—Movable barrages; Lock or dry-dock gates
    • E02B7/40—Swinging or turning gates
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F5/00—Sewerage structures
    • E03F5/10—Collecting-tanks; Equalising-tanks for regulating the run-off; Laying-up basins
    • E03F5/105—Accessories, e.g. flow regulators or cleaning devices
    • E03F5/108—Cleaning devices providing a flushing surge

Definitions

  • the present invention relates generally to sealing systems and may alternatively or additionally relate to tipping gates, flusher gates and the like.
  • the present invention may comprise one or more sealing petals for sealing between two surfaces, objects or the like.
  • the petal/s are used as a sealing system for a movable gate, valve or the like, for example being provided on either or both of a fixed and/or moving part.
  • the sealing system is applied to the water industry. However, the system may be applicable to other uses and industries than those described by way of example herein.
  • the present invention relates to a fluid-actuated tipping gate. In some aspects and embodiments the present invention relates to an improved sewer flusher.
  • An aspect of the present invention relates to a sealing member.
  • the member is a "petal” like member and one or more such members are provided.
  • the petal may be at least partly deformable.
  • a plurality of such members may be provided and particular lay patterns of the members may be used.
  • the petal-based sealing system may be used in conjunction with one or more further sealing systems, such as a brush seal or a wiper seal.
  • a fluid actuated tipping gate is well understood. This type of gate is often situated in a sewer to provide a flushing effect, this is designed to prevent FOG (fat, oil and grease) and silt build-up and for general fluid control, for example, flood water storage/controlled release.
  • a fluid actuated tipping gate that exists in a sewer to control the movement of sewage, FOG and silt must operate in a hostile environment.
  • One of the main problems associated with such a device operating in such an environment is providing adequate sealing to ensure a suitable fluid head is able to build behind the gate thus ensuring a successful, regular and reliable flushing function. This patent intends to address the issue of sealing.
  • the basic operational principle of the gate is as follows.
  • a gate within a frame is positioned in a generally vertical orientation when no fluid is present.
  • the gate is able to pivot approximately along its vertical length.
  • the pivot point is below half way along the length of the gate, for example between one half and one sixth (towards the "bottom") of the way along the gate. The further down the gate the pivot point the greater the stored energy behind the gate is in use.
  • the gate may have additional mass attached below the pivot axis. Seals exist between the gate perimeter and housing. Fluid builds up behind the sealed gate; the lower one third of the gate cannot swing open (through) as it is constrained by pivot stops. As the fluid continues to build, it passes the gate's pivot axis and it continues to build.
  • the gate When fluid reaches a level such that the moment above the pivot axis is greater than the moment below the pivot axis, the gate becomes unstable. At this point there is nothing to stop the gate from rotating (opening).
  • the gate opens rapidly, translating through, for example, 90° to a generally horizontal orientation; its rotational position again controlled by pivot stops and the mass of fluid. This action results in fluid flowing above and below the gate.
  • the gate is held in the open position as the mass of the fluid passing over it produces a greater moment on the two third side of the gate such that it overcomes the moment of the one third side of the gate and the additional mass contained on that side. Further, closure is also prevented by fluid passing under the gate.
  • the gate again becomes unstable and the eccentric mass on the lower half of the gate causes the gate to rapidly rotate back a vertical position.
  • the present invention may relate generally to devices and systems for fluid flushing systems (for example in an open or closed channel, conduit or the like).
  • the present invention may relate to a flushing sewage system to prevent the build-up of deposits.
  • the present invention may provide a sewer flushing device located or locatable in a sewage system.
  • the device may comprise a housing, frame or the like adapted for location in a sewage flow path and a gate pivotally supported on or in the housing and movable between open and closed positions.
  • the gate may be biased towards a closed position so as to inhibit the flow of sewage and thereby cause a build-up of sewage; when the sewage upstream of the gate reaches a predetermined level the gate is urged to its open position such that a flushing pulse of sewage flows downstream.
  • the present invention provides a fluid flushing device comprising a housing locatable in a fluid flow path and a gate pivotally supported on or in the housing and being movable between a closed position and an open position, the gate is biased towards the closed position to inhibit fluid flow and cause a build-up upstream of the device, the gate being movable to the open position to release a flushing pulse of fluid through the device when the fluid head height exceeds a required level, in which the device is provided with holding means for releasably holding the gate in the closed position whereby to increase the sewage head height required before it opens.
  • the holding means may comprise one or more magnets.
  • the present invention relates to a new method of partially or fully sealing a gate, such as a sewage flusher gate, within a frame.
  • a further aspect provides a fluid flushing device comprising a housing locatable in a fluid flow path and a gate pivotally supported on or in the housing and being movable between a closed position and an open position, the gate is biased towards the closed position to inhibit fluid flow and cause a build-up upstream of the device, the gate being movable to the open position to release a flushing pulse of fluid through the device, in which the gate is provided with one or more sealing petals for sealing it against the frame.
  • a series of sealing petals are provided. Different types of petals are provided for by the present invention, along with different lay patterns. In one embodiment, for example, the petal/s taper along their length to provide flexibility.
  • the sealing means may comprise a plurality of polyurethane petals.
  • a further aspect provides a fluid flushing device comprising a housing locatable in a fluid flow path and a gate pivotally supported on or in the housing and being movable between a closed position and an open position, the gate is biased towards the closed position to inhibit sewage flow and cause a build-up upstream of the device, the gate being movable to the open position to release a flushing pulse of fluid through the device, in which the pivot point of the gate is spaced away from the gate centre line.
  • a further aspect provides a fluid flushing device comprising a housing locatable in a fluid flow path and a gate pivotally supported on or in the housing and being movable between a closed position and an open position, the gate is biased towards the closed position to inhibit fluid flow and cause a build-up upstream of the device, the gate being movable to the open position to release a flushing pulse of fluid through the device, in which an edge strip seal is provided for attachment to the periphery of the gate for sealing it against the housing.
  • a further aspect provides a fluid flushing device comprising a housing locatable in a fluid flow path and a gate pivotally supported on or in the housing and being movable between a closed position and an open position, the gate is biased towards the closed position to inhibit sewage flow and cause a build-up upstream of the device, the gate being movable to the open position to release a flushing pulse of fluid through the device, in which side walls are provided on the downstream side of the frame to restrain flow between the frame as the gate initially moves away from the closed position.
  • the present invention provides a sewage flushing device located or locatable in a sewage flow path.
  • the device is located or locatable in a conduit or culvert such as a roadside drain and/or could be built into an irrigation system.
  • a further aspect relates to alternative considerations, for example for a flusher gate system
  • the current state of the art flusher gate has a pivot which is near or very close to being in-line with the gates CoG (centre of gravity) when in a vertical orientation.
  • the restoring moment, acting to close the gate is at or near its maximum when the gate is horizontal, which decreases as it moves toward its vertical (closed) orientation.
  • the present invention relates to positioning the pivot away from the gate centreline, or CoG, so to produce a greater restoring moment (acting to close the gate) when the gate is near or at its vertical orientation.
  • the additional restoring force acts to push the section of seal acting around the curved section into the gate, improving the effectiveness of and helping to close the seal.
  • the restoring moment throughout the gate travel is also required to overcome rotational resistance, which for an embodiment having a seal in constant contact, may be required due to friction between the seal and gate housing (could prevent gate from fully closing).
  • the sweep of the gate may be modified so that as the gate moves toward its vertical orientation, there is a component of vertical translation rather than only horizontal (at curved section of gate), acting to push the seal down rather than only along its contacting surface.
  • the redistribution of restoring force from having all at its horizontal and little to none when vertical, means that less weights would be required to alter the 'snap open' water height.
  • By increasing the restoring moment when in a vertical orientation the required water height before the gate snaps open is also increased, which is done by positioning pivot point away from CoG rather than having to add additional weights as in the current state of art.
  • Figure 53 shows a chart which shows the restoring force for a particular embodiment, where the gate closing or restoring moment is almost the same in both horizontal and vertical orientation, reaching a peak when at 45 degrees (it could be made to be whatever was required, could be exactly equal at each end of gate sweep).
  • the principles established here may be used to provide a gate valve, for example a sewage flusher gate. It may be used separately or in conjunction with the sealing system described herein.
  • a flusher gate is provided with a coating or layer which helps to prevent the build-up of FOG. This may be used in conjunction with other aspects, for example the sealing system, or may be used separately.
  • a flusher gate is formed from a metal; in other embodiments at least part of the gate may be formed from a plastics material. This feature may be used separately or in combination with other aspects and embodiments described herein.
  • the present invention provides a flushing gate in which magnet(s) are used to provide a force acting to hold the pivoting gate in its closed position, resulting in a greater fluid head height than would be achieved if they were not there; and which when the gate has begun to open, the force they provide to hold the gate closed will rapidly diminish or be completely removed.
  • a further aspect provides a flushing gate in which a catch mechanism is used to provide a force acting to hold the pivoting gate in its closed position, resulting in a greater fluid head height than would be achieved if the catch were not there; and which when the gate has begun to open, the force it provides to hold the gate closed will rapidly diminish or be completely removed.
  • a further aspect provides a flushing gate where side walls are used on the downstream side to restrain flow between the frame and pivoting gate during initial opening of at least 25 degrees (from fully closed position) or until fully open.
  • a further aspect provides a flushing gate which has its pivot point on the downstream side of the gate, and which is spaced away from the gate centre line by at least 25mm.
  • a further aspect provides a flusher gate where an edge strips seal is used to seal between the gate and its housing.
  • the edge seal may be clipped on, and which no adhesive or fixings are used.
  • a further aspect provides a fluid flushing device comprising a housing locatable in a fluid flow path and a gate pivotally supported on or in the housing and being movable between a closed position and an open position, the gate is biased towards the closed position to inhibit fluid flow and cause a build-up upstream of the device, the gate being movable to the open position to release a flushing pulse of fluid through the device when the fluid head height exceeds a required level, in which the device is provided with helper means for helping the gate to move from its open to its closed position.
  • a further aspect provides a fluid flushing device comprising a housing locatable in a fluid flow path and a gate pivotally supported on or in the housing and being movable between a closed position and an open position, the gate is biased towards the closed position to inhibit fluid flow and cause a build-up upstream of the device, the gate being movable to the open position to release a flushing pulse of fluid through the device when the fluid head height exceeds a required level, in which the upstream face of the gate is provided with means for inducing turbulent flow in the fluid pulse.
  • a further aspect provides a fluid flushing device comprising a housing locatable in a fluid flow path and a gate pivotally supported on or in the housing and being movable between a closed position and an open position, the gate is biased towards the closed position to inhibit fluid flow and cause a build-up upstream of the device, the gate being movable to the open position to release a flushing pulse of fluid through the device when the fluid head height exceeds a required level, in which the device is provided with means for monitoring the open/closed status of the gate.
  • Figure I shows one example of the proposed flusher gate assembly formed according to an embodiment of the present invention.
  • the downstream side of the assembly is shown - the gate is in the closed position.
  • the assembly consists of a generally 'U' shaped frame that has two angled dam plates attached.
  • the dam plates connect the frame to the manhole wall, they are used to collect the fluid and ensure it builds up against the gate and cannot escape around the sides of the gate housing.
  • the radius of the frame has a radius just smaller than the radius of the sewer half pipe located in the bottom of the manhole - this enables relatively easy fitment - minimum civil enabling works - the frame is grouted and sealed into position.
  • the frame has slots on each of its vertical, parallel sides. The slots are designed such that the gate can be fitted to the housing whilst the housing is in-situ by lowering the gate and rotating it through approximately 45°, slotting it between the housing walls and re-orientating it to engage with the slots - removal is the reverse procedure.
  • the frame has a device (pivot stops) to stop the gate continuing to rotate when it is in the horizontal position and a device (pivot stops) to stop the gate continuing to rotate when it is the vertical position.
  • FIG. 1 shows the same downstream view but with gate in the open position.
  • Figures 3 shows a gate installed in a sewer half pipe with its dam walls located up against the manhole wall so as to capture all of the fluid and allow it build-up against the sewer gate.
  • Figure 4 shows the gate at 45° with respect to vertical and
  • Figure 5 shows the gate in its fully open position, that is, 90° to vertical (fluid flow is not depicted).
  • This patent intends to describe a new method of partially or fully sealing the gate within its frame to ensure 'fit and forget' operation and reliability. It is considered that removing the type of seals that require compression to operate to be beneficial, for example, where a gate compresses a seal against a frame. This type of seal can fail if debris becomes lodged between the gate and the frame - this results in leakage preventing a fluid head from being able to build - this prevents flushing, in turn, this prevents the removal of the trapped debris.
  • the present invention contemplates individual, flexible, membrane type elements (petals) that combine to form a near continuous but passive seal that provides an effective sealing system.
  • Individual petals, as these elements can be described, can be, for example, side-by-side, overlapping, offset, staggered, interwoven or multi-layered in any combination, format, arrangement or configuration.
  • the petals can be of any suitable shape, size, profile, section, material, strength or stiffness in any combination, format, arrangement or configuration.
  • Petals can be attached to the gate or the frame or a combination of such. Individual petals have the ability to deflect alone and independent of their neighbour(s). Where debris becomes trapped then an individual petal may not seat correctly or may partially deflect around it, however, its neighbouring petal(s) will maintain a full seal. Leakage may still occur but it should be minimal. This will still allow a head to build, albeit more slowly, the next flushing action should remove the trapped debris.
  • Figure 6 Shows an example of a basic petal.
  • the gate and frame may use a combination of petal seals and strip seals or a combination of petal seals and large folding half cone membrane seals or all petal seals; examples will be given later.
  • a high tear strength, high flexibility petal is desirable, an appropriate material may be Polyurethane, for example. Polyurethane is extremely stable and resistant to many chemicals often found in sewers. Further, cast Polyurethane can be very smooth and other substances find it difficult to adhere to.
  • other examples of materials that could be used for the petals include; Nitrile, EPDM, Neoprene, SBR, Silicone, Butyl, Polyacrylate, Hypalon, Viton and Flurosilicone.
  • Figures 7 through 19 show examples of other petal shapes, profiles and sections. The exact physical and chemical parameters of each petal will be bespoke to the application in question.
  • Figure 19 shows a gate that uses individual petal seals on the radius of the gate and strip or 'P' seals on the straights of the side walls (petal seals are not shown deflected rearwards). It is likely that any debris will become trapped around the bottom of the gate area, hence, this sealing arrangement may be acceptable with respect to function and reliability.
  • Figure 20 shows a gate that uses individual petal seals on the radius of the gate and a passive folding half cone membrane seal on the side walls (only one cone seal shown is shown and petal seals are not shown deflected rearwards).
  • FIG. 21 a show a gate that uses individual petal seals around its full perimeter (petals are not shown deflected rearwards). To allow this system to be successful it is necessary to invert the gate mounting slots in the side wall (see Figure I for previous layout) and to provide additional side plates - both of these features are critical and are detailed in Figures 22 and 23 respectively.
  • the additional side plates and moving the mounting slots prevent the individual petals inverting during the opening and closing sequence, instead they simply slide in plane.
  • a polymeric petal seal for example, Polyurethane
  • the gate can be readily tested by operatives external to the manhole, however, an additional gate test eye can also be incorporated - see Figures 28 and 29.
  • Figure 21 b and Figure 21 c show how the petal would deflect rearward when in operation and sealed against the frame radius or housing wall.
  • the petal seal design allows for substantial clearance between the gate and the housing.
  • Figure 24 shows this clearance - this is shown on a 12" gate.
  • sealing bearings can be extremely difficult, especially when cost is critical. This design will accept either a sealed bearing or preferably, a high-play free running plain or bushed bearing as illustrated by Figure 25.
  • petal seal involves moulding a continuous 'U' shaped seal, for example, that extends around the complete sealing perimeter of the gate (hence 'U' shape). The continuous 'U' shaped seal is then partially slit such that individual petals are formed but a continuous element still remains - see Figure 26 - note; this shows only a small section of a straight element. Further, this type of seal or the separate petal seals themselves could be modified with a hinge to alter the bending/sealing properties of the petal for a given material stiffness - see Figure 27.
  • test eye point - such an eye could take any form and include a wire pull if deemed necessary.
  • dam plates will be made as extruded plates with socket and plug profiled ends - this will allow the plates to be brought together to make up a given length.
  • Typical material would be polymeric, for example UPVC.
  • the structure form will give it its strength.
  • the dam plates could be made in a concertina arrangement. The object of this is to make the dam plates rapidly adjustable to allow the gate assembly to be rapidly installed in the manhole.
  • An angled extrusion on the gate housing could allow rapid attachment of the dam plate to the housing.
  • the angled extrusion could be adjustable with respect to angular positioning.
  • Figures 30 and 31 show an example. To ensure the sealing mechanism of the petals is as effective as possible bristle cleaning tufts can be included.
  • FIG. 32 and 33 show a single bristle tuft mounted radially onto the bottom edge of the lower part of the flusher gate.
  • the bristles can be any stiffness, length, material, orientation, diameter, further they can be mounted in any position to yield best cleaning results.
  • Figure 34 illustrates a further embodiment in which a finger seal overlays a gap between two petal seals.
  • the petal seals are formed from a polyurethane material with a Shore hardness of approximately A90.
  • a low friction coating such as Apticote 450 (a nickel/PTFE composite coating). This can be used to reduce friction and to avoid an excessive dam plate opening/closing force.
  • Figure 35 shows a one-piece petal seal arrangement forming part of an embodiment of the present invention.
  • Figure 36 shows a one-piece finger seal arrangement suitable for use in conjunction with the petal seal arrangement of Figure 35.
  • Figure 37 shows the finger seal arrangement of Figure 36 overlaid onto the petal seal arrangement of Figure 35; with the combined sealing arrangement fitted onto a dam plate.
  • Figure 38 is a perspective view of a flusher gate dam plate formed according to the present invention.
  • This embodiment includes use of an encapsulated magnet, for example positioned at the top of the gate (out of the fluid) that would allow the fluid head to build past the point of normal gate instability, whilst still maintaining the gate in a vertical closed position. At a point where the instability due to the fluid head combined with the clamping force of the magnet is overcome the gate will open with a greater moment than with the instability moment alone.
  • Figures 39 to 41 illustrate a further embodiment of a flushing gate, the technical features of which are described below.
  • Figure 39 shows the rear (downstream) side with the gate in a closed position;
  • Figure 40 shows a front (upstream) perspective view of the gate in an open position;
  • Figure 41 shows a rear (downstream) view of the gate in an open position.
  • Magnets are housed on both the pivoting gate and its accompanying housing frame, which are used to provide a force acting to keep the gate in a closed position (which for this embodiment is upright at 90 degrees, although an embodiment having a closed position away from vertical is also possible).
  • the purpose of the magnets is to produce an additional force acting to close the gate other than that provided by the head of fluid or self-weight, which can quickly be removed once the gate has started to open (in under 10 degrees from its closed position). Because the force provided by the magnets diminishes rapidly as the gate starts to open, the gate tends to 'snap open' rather than to open slowly or fail to fully open due to loss in fluid head height.
  • Figure 43 shows the moments (forces) which act on the gate.
  • the opening moment due static fluid pressure does not begin to build until the fluid level has reached the pivot point, and then increases as a square of the head height.
  • the moment acting to close the gate begins to build from zero head height, and increases linearly after reaching the pivot point.
  • the resultant moment from static fluid pressure acting on the upstream side of the gate is shown, which acts to keep the gate in its closed position until reaching an equilibrium point at a fluid head height of about 490mm (which is driven by gate area differences either side of the pivot) where the forces from static fluid pressure acting to close the gate are equal to those acting to open it.
  • the lower line shows the resultant moment acting on the gate from fluid head, self-weight, and magnetic force.
  • the self-weight of the gate, its CoG position relative to the pivot, and force required to part the magnets mean that a higher fluid head level is required before the moment acting to open the gate equals that acting to close it.
  • the force required to part the magnets rapidly drops off (due to exponential decay in magnetic field with separation), which produces a step change (an almost instantaneous change) in the resultant moment acting on the gate, with a significant increase in magnitude of moment acting to open the gate.
  • the increase magnitude accelerates the gate toward its open position, as well as keeping the resultant moment acting to open the gate with drop in fluid head height.
  • the gate closes after flushing once the fluid head level has dropped below the gate in its horizontal open position.
  • flushing gate embodiment described uses a magnets mounted on both the gate and the gate housing to produce an additional holding force
  • a magnet housed on one or the other which attracts to a piece of ferritic material.
  • a further embodiment could encompasses an alternative mechanism or method which applies a force acting to keep the gate closed when the gate is at or very near its closed position, but which quickly dissipate as the gate begins to open in order to provide a step increase in magnitude of resultant moment acting to open the gate.
  • the "ears”, or side walls, shown in Figures 39 to 41 are used to contain the fluid as the gate first opens. If the fluid is not restrained between the frame and gate as it has been done in the described embodiment, then it is possible that the gate will be unable to fully open, with even a partial opening ( ⁇ 20°) proving a large enough gap between the frame and gate for sufficient flow to prevent the gate from fully opening (flow though is below that of up stream flow, with a rapid falling head height causing the gate to re-close before it has fully opened). Having the ears, or side walls, to contain the fluid as the gate begins to open ensures a slug of fluid has to pass over the top of the gate, firmly slamming it into the end of travel stop.
  • FIG. 39 to 41 have ears which restrict flow between the flusher frame and gate above the pivot for the first 45 degrees from opening, however alternative embodiments could contain the fluid between the pivoting gate and supporting walls though any angle beyond 15 degrees up to its fully open position.
  • the current state of the art flushing gates have a pivot which is near or very close to being in-line with the gate assembly CoG when in a vertical (or closed) orientation.
  • the restoring moment, acting to close the gate is at or near its maximum when the gate is in its fully open position (likely to be on, or near to horizontal), which decreases as it moves toward its closed orientation (likely to be near or close to vertical).
  • the is positioned pivot away from the gate centreline, or CoG, so to produce a greater restoring moment (acting to close the gate) when the gate is near or close to its closed orientation (which is vertical for the described embodiment, but could be at an angle several degrees away from this in an alternative embodiment) .
  • the sweep of the gate is modified so that as the gate moves toward its closed position (or vertical orientation for the described embodiment), there is a component of vertical translation rather than only horizontal at curved section of gate, acting to push the seal down rather than only across its contacting surface.
  • the redistribution of restoring force from being at a peak when the gate is open, and at or near to its minimum when fully closed, means that fewer weights are required to achieve the same equilibrium of moment fluid height.
  • the required fluid height before the gate snaps open is increased, which is done by positioning the pivot point away from the gate CoG rather than adding additional weights.
  • moving the pivot off centre allows for the added weights (hidden by the pivot fairing in Figures 39 to 41 ) to be positioned on the downstream side (underside of gate when open), which helps to reduce probability of rags being snatched.
  • the bottom of the gate is provided with a weight stack to restore it to the closed position after the flushing pulse.
  • the weights are covered by a fairing which stops rags and the like snagging and makes the gate more hydrodynamic.
  • the chart shown in Figure 44 shows the restoring force for this particular embodiment, where the gate closing or restoring moment is almost the same in both its horizontal (open) and vertical (closed) orientations, reaching a peak when at around 45 degrees (it could be made to be whatever was required, could be exactly equal at each end of gate sweep).
  • Figures 45 and 46 show front and rear views of an embodiment which is almost identical to that illustrated in Figures 39 to 41 , with the exception of the end of travel stop being located in a position to prevent the gate from opening further than 45 degrees from vertical (which could be a greater or smaller angle when in a fully open position in an alternative embodiment), with fluid still contained between the gate and frame above the pivot point when fully open.
  • This has been done to concentrate any flow through the gate during flushing to being below the pivot point, as this has a greater pressure head, and would reduce the head loss between flushes.
  • This will give a greater number of flushes for same volume of fluid passing through the gate, as well as the fluid that did passing though doing so with a greater average velocity, which may be more productive in scouring.
  • Figure 47 and 48 shows an embodiment of the flusher gate installation in a sewer.
  • a slit is cut into the channel, filled with grout or other filler, and then the flusher frame edge is slotted in until the underside is tangential with the channel surface.
  • Side plates made to suite are installed in a similar manner, being bolted to both the frame edge and side walls of confinement (in this case the sides of the man hole). Fluid, or sewerage, is then able to build up on the upstream side of the flusher until the critical head level required for the gate to open is reached.
  • the shape of the device and parts thereof are complimentary with the sewage conduit.
  • the bottom of the gate may be rounded or square-bottom to match a conduit.
  • the device may be scalable to fit conduits of any size based on the principles established and defined herein.
  • Figure 49 there is shown plan, perspective, side and front views of a helper spring arrangement.
  • the spring can be fitted to the rear (downstream) face of a gate. When the gate opens the spring is deformed and energised and then helps the gate to return to the closed position.
  • a spring or other energisable closing feature could be provided on the floor of the conduit.
  • Figure 50 there is shown various views of the fluid head side of a gate formed according to an aspect of the present invention.
  • the gate face is provided with a plurality of fins, which in this embodiment are curved. In use when the gate opens fluid rides over the top of the fins, which promote turbulent flow to improve the cleaning effect of the fluid pulse.
  • Figures 51 and 52 show a gate formed according to a further aspect of the present invention and in a closed and open position.
  • the gate is provided with means for determining opening and closing events.
  • a sealed reed switch is provided on the gate and a magnet is provided on the housing. When the switch is near the magnet (for example within about 10mm) it is open and when the switch is far from the magnet it is closed.
  • different means for determining opening and/or closing of the gate may be used, such as a plunger switch.
  • the magnets used to hold the gate closed could be used to trigger a switch.
  • a switch or the like may be connected to a data logger. The logger may then be linked (for example wirelessly) to a receiving station which processes/displays the data.
  • Data relating to opening and closing of the gate can be used for a variety of purposes. For example an opening and/or closing signal could inform that the gate is functioning correctly.
  • This system could also, for example, be used to provide basic flow rate data. For example it would be possible to calculate the volume of fluid which passes through the gate with each pulse; then the frequency of pulses could be used to determine fluid volume passing through over time. This could be used to determine flow rate in that section of conduit and this in turn could, for example, give an indication of a blockage.

Abstract

L'invention concerne un dispositif de chasse de fluide comprenant un corps pouvant être placé dans un trajet d'écoulement d'un fluide et une vanne montée de façon pivotante sur ou dans le corps et mobile entre une position fermée et une position ouverte, la vanne étant sollicitée en direction de la position fermée pour empêcher l'écoulement des eaux usées et provoquer une accumulation en amont du dispositif, la vanne pouvant être amenée vers la position ouverte pour libérer une pulsion de chasse de fluide à travers le dispositif lorsque la hauteur de retenue de fluide dépasse un niveau requis, le dispositif étant doté de moyens de maintien permettant de maintenir de manière libérable la vanne dans la position fermée, ce qui permet d'augmenter la hauteur de retenue du fluide requise avant son ouverture.
PCT/EP2016/056295 2015-03-22 2016-03-22 Vanne de curage par pulsion WO2016150980A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB1504808.5 2015-03-22
GBGB1504808.5A GB201504808D0 (en) 2015-03-22 2015-03-22 Improvements in or relating to sealing
GB1520768.1 2015-11-24
GBGB1520768.1A GB201520768D0 (en) 2015-11-24 2015-11-24 Improvements in or relating to flusher gates

Publications (1)

Publication Number Publication Date
WO2016150980A1 true WO2016150980A1 (fr) 2016-09-29

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2016/056295 WO2016150980A1 (fr) 2015-03-22 2016-03-22 Vanne de curage par pulsion

Country Status (1)

Country Link
WO (1) WO2016150980A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060081292A1 (en) * 2004-10-15 2006-04-20 Magic Plastics, Inc. Quickly opening hinged check valve with pre-determined upstream pressure required to open
WO2006105983A2 (fr) * 2005-04-08 2006-10-12 Klaus Ulrich Giehl Dispositif de retenue pour un regard d'egout
US20110297250A1 (en) * 2009-02-04 2011-12-08 Nippon Koei Co., Ltd. Opening/closing device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060081292A1 (en) * 2004-10-15 2006-04-20 Magic Plastics, Inc. Quickly opening hinged check valve with pre-determined upstream pressure required to open
WO2006105983A2 (fr) * 2005-04-08 2006-10-12 Klaus Ulrich Giehl Dispositif de retenue pour un regard d'egout
US20110297250A1 (en) * 2009-02-04 2011-12-08 Nippon Koei Co., Ltd. Opening/closing device

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