Patent Application
20240278984
The present invention generally relates to a surge dampening baffle for flexible tanks used in transporting liquids.
Flexible containers are used for the handling, storage and transportation of large volumes of liquids, such as water or fuel, to remote sites. These containers are commonly referred to as bladder or pillow tanks, and they are typically rectangular so that they can be efficiently loaded onto vehicles for transportation. Examples of some prior art flexible liquid containers are found in U.S. Pat. No. 4,573,508 to Knaus, U.S. Pat. No. 5,499,743 to Blumenkron, U.S. Pat. No. 3,288,186 to Headrick, and U.S. Pat. No. 10,029,848 to Yaremenko. Flexible liquid containers, such as exemplified in the aforementioned U.S. patents, are typically made of a flexible fiber reinforced elastomeric material and have inlets or nozzles for filling and draining purposes. A principal advantage to such flexible liquid containers is that they are relatively lightweight and compact when not filled with a liquid since they do not have a frame or rigid supports. Headrick and Yaremenko provides further advantages over Knaus and Blumenkron in that they disclose of surge attenuating baffles within the flexible liquid container. In particular, Yaremenko discloses of a flexible tank with a fabric and cable baffling system that dampens the wave or liquid current forces that are in effect during flight. The tank includes an inner tank and outer tank. The inner tank is provided with a plurality of internal transverse baffles, and each baffle is disposed in a plane that is substantially transverse to the principal direction of surge action of the liquid in the tank. Each baffle is composed from separate sections or flap portions, which have their base portions welded to the inside surface of the inner tank and their free end portions radiating inwardly towards the centre of the baffle. The free end portions of each flap portion can then be strung together with a cord or cable to form the baffle. The assembled baffles define a number of voids in between adjacent flap portions, and some ports are provided in some (or all) of the flap portions to allow a reduced flow of liquid between sections of the inner tank during filling and emptying of the inner tank. When fully assembled and filled with fluid, the transverse baffles provide a wave buffering system to counteract longitudinal acceleration of the fluid within the inner tank.
While the Yaremenko baffle system provides a wave buffering system to counteract longitudinal acceleration of the fluid, a more effective and simpler system would be beneficial. Accordingly, it is now recognized that there is a need for an improved baffle system that is simpler to manufacture and assemble.
In one aspect, the present invention provides a baffle for a liquid transport tank, comprising: a base portion connected to an interior surface of the liquid transport tank; a single panel shaped to substantially cover the internal cross-sectional area defined by the liquid transport tank; and a link mechanism to interconnect the single panel to the base portion.
In some aspects, the base portion is aligned along a line circumscribed by a plane transverse to a length of the liquid transport tank.
In some aspects, the base portion circumscribes a plane transverse to a length of the liquid transport tank.
In some aspects, the single panel further comprises a plurality of loops along the circumference of the single panel.
In some embodiments, the link mechanism comprises of: a plurality of loops on the single panel; a plurality of loops on the base portion; and a cord weaving through the plurality of loops on the single panel and the plurality of loops on the base portion.
In some aspects, the single panel further comprises of a foot portion connected to an interior surface of the liquid transport tank.
In some aspects, the foot portion further comprises of one or more apertures.
Further features and advantages will be apparent from the following detailed description, given by way of example, of preferred embodiments taken in conjunction with the accompanying drawings, wherein:
For the purposes of promoting an understanding of the principles of the invention, reference will now be made to the exemplary embodiments illustrated in the drawings, and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of the invention is thereby intended. Any alterations and further modifications of the inventive features illustrated herein, and any additional applications of the principles of the invention as illustrated herein, which would occur to one skilled in the relevant art and having possession of this disclosure, are to be considered within the scope of the invention as defined by the claims.
Referring to
The outer tank 14 provides a flexible outer bladder that is adapted to removably receive the inner tank 12. The outer tank 14 is preferably highly abrasion and puncture resistant and, in embodiments intended for fuel applications, it is also chemically resistant to hydrocarbon fuel. A suitable material for the outer tank is an abrasion resistant urethane coated fabric, which is known and used in inflatable booms for the containment of oil spills. A liquid tight zipper 16 is provided on an access port on the outer tank 14 to enable the inner tank to be removed for inspection or replacement while providing a liquid tight seal of the access port. The location and/or the configuration of the zipper 16 may vary from one design of tank to another. The outer tank also may include a customizable webbing system 18 built in to enable the tank to be secured to the cargo floor of an aircraft or vehicle.
To provide for safe transport by aircraft, each flexible liquid transport tank may be designed for use with a particular aircraft or model of aircraft. As well, the tank should preferably be transported either completely full to minimize fluid dynamics, or empty.
Each tank has one or two dedicated fill and drain ports 20,22 with valves 24 on the outer tank 14 to facilitate filling and discharging of liquid, and ball valves to seal the tank after filling is complete.
The inner tank 12 is provided with a plurality of internal transverse baffles 28, each baffle being disposed in a plane that is substantially transverse to the principal direction of surge action of the liquid (fuel) in the tank (i.e. substantially transverse to the length of the inner tank). Each baffle 28 includes of a plurality of flexible planar transverse panels such as flap portions 30 having a base portion 32 that is attached (welded) to the inside wall of inner tank 12. Each flap portion 30 has an unsupported portion or free end that includes a terminal end with a loop, and the free ends converge to be adjacent to the loops of neighboring flap portions in the assembled inner tank. A cord of cable 36 is laced through the loops in a weave pattern to draw the loops together and thereby draw flap portions 30 taut to provide structural rigidity to baffle 28. The assembled baffles 28 define a number of voids 42 in between adjacent flap portions, and some ports 44 are provided in some (or all) of the flap portions to allow a reduced flow of liquid between sections of the inner tank 12 during filling and emptying of the inner tank 12. With inner tank 12 filled, transverse baffles 28 provide a wave buffering system to counteract longitudinal acceleration of the fluid within inner tank 12.
The improvement is a tank baffle system of the present invention. Referring to
To assemble baffle 100, a person climbs inside inner tank 130 via an encapsulated access hole, which is sealed in the finished product, and performs the final assembly of baffles 100 by lacing panels 110 to base portion 112 through loops 114 and loops 116, using one cord/cable 118 per baffle 100. Alternatively, the above process may be carried out earlier in the manufacturing process prior to sealing existing panel seams and openings. In such instances, there would be no need for a purpose-made encapsulated access hole.
The assembled baffles 100 define a number of gaps 120 located between each of individual loops 114 and loops 116, and some ports 122 are provided in base portion 112 to allow a reduced flow of liquid between sections of inner tank 130. In the illustrated embodiment, the transverse panels 110 are shaped in a manner that enables the transverse baffle 100 to substantially cover most of the internal cross sectional area defined by inner tank 130 with liquid therein such that adjacent internal transverse baffles 100 define a substantially compartmentalized space in between said adjacent transverse baffles 100.
With inner tank 130 filled, the transverse baffles 100 provide a wave buffering system to counteract longitudinal acceleration of the fluid within inner tank 130. As a result, baffles 100 prevent the center of gravity of the tank from shifting, which is very important for aircraft controllability.
Referring to
To assemble baffle 200, a person climbs inside inner tank 130 via an encapsulated access hole, which is sealed in the finished product, and performs the final assembly of baffles 200 by lacing panels 210 to base portions 212 through loops 214 and loops 216, using cord/cable 218. Alternatively, the above process may be carried out earlier in the manufacturing process prior to sealing existing panel seams and openings. In such instances, there would be no need for a purpose-made encapsulated access hole.
The assembled baffles 200 define a number of gaps 220 located between each of individual loops 214 and loops 216, and some ports 222 are provided in between base portion 212 and panel 210 to allow a reduced flow of liquid between sections of inner tank 130. In the illustrated embodiment, the transverse panels 210 are shaped in a manner that enables the transverse baffle 200 to substantially cover most of the internal cross sectional area defined by inner tank 130 with liquid therein such that adjacent internal transverse baffles 200 define a substantially compartmentalized space in between said adjacent transverse baffles 200.
The number, placement and configuration of the gaps 120, 220, the ports 122, 222, and the apertures 215 may be varied as desired or as required for a particular application of the present invention.
The baffles of the present invention have a contour that matches the shape of a cross-section segment of a conventional liquid transport tank/bladder. This particular shape of the baffles of the present invention is advantageous in that it allows for smooth linkage of the base portions of the baffles to the curved interior surface of the liquid transport tanks as well as the panels to the base portions. The proposed baffle design allows more smooth linkage of the baffle to the curved bladder surface as loops attached to the base portions and thereby to the bladder have shorter straight bases. As a result, the load from a bladder being passed to a baffle is distributed more evenly along the baffle panel and bladder. Further, the panels' solid surface (with little to no gaps) provides more efficient dampening of liquid movement between baffles. The baffles of the present invention have better production workability and are also easier to manufacture and assemble.
Other aspects and features of the present invention will become apparent to those of ordinary skill in the art upon review of the following description of specific embodiments of the invention in conjunction with the accompanying figures.
While the above description and illustrations constitute preferred or alternate embodiments of the present invention, it will be appreciated that numerous variations may be made without departing from the scope of the invention. It is intended that the invention be construed as including all such modifications and alterations.
