Plastic and nonmetallic article shaping or treating: processes – Treatment of material by vibrating – jarring – or agitating...
Patent
1997-07-15
2000-01-18
Kuhns, Allan R.
Plastic and nonmetallic article shaping or treating: processes
Treatment of material by vibrating, jarring, or agitating...
264101, 264113, 264120, 264122, 264571, B29C 4304, B29C 4320
Patent
active
060155183
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention is in the field of conducting moving fluids and relates to a device and a method for the manufacture of the device. The device is used for conducting fluids between a space, which is at least partly bounded by a fixed surface through which the fluid is to pass, and a duct, through which the fluid is supplied or removed.
BACKGROUND OF THE INVENTION
Fluids are transported for the most varied purposes by means of pumps or similar fluid delivery means in channel, sewer or duct systems. A plurality of such fluid conducting systems with fluid delivery means serve to bring a fluid for a specific action into a space or a room, or remove it therefrom, the fluid being conveyed between the space and the duct by openings in the surface bounding the space or through an open duct end.
Examples of such fluid conducting systems are systems for evacuating spaces, systems for gassing or gas infection of spaces, systems for heating or cooling spaces by transporting fluid heat carriers through the spaces or systems for removing solids or other fluids from spaces by utilizing the kinetic energy of the fluids supplied to the spaces. In many of these applications it would be desirable for the most varied reasons to be able to transport the fluid as a continuum through the surface bounding the space, in such a way that all points of said surface would be identical with respect to the fluid passage. In the prior art this wish is approximately fulfilled by providing a large number of duct ends opening into the space providing larger duct ends closed with a porous wall and between the duct ends and porous wall a distributing space is provided. The finer the pores of such porous walls, the higher the pressure gradient necessary in order to deliver the fluid through the wall, which in turn increases the demands concerning the mechanical stability of the wall. Therefore, for each application a procedurally economic optimum must be sought between a surface continuity of the fluid delivery over the complete surface through which the flow is to take place still satisfying the requirement and a still acceptable level of the necessary pressure difference.
SUMMARY OF THE INVENTION
An object of the invention is to provide a device making it possible to shift the aforementioned optimum towards a better fluid continuity over the surface through which the fluid is to flow, without having to accept increased effort and expenditure on the pressure difference size. Thus, in other words, an object of the invention is to provide a device for conducting a fluid between a space bounded by a surface and a duct, the continuity of the fluid flow through the entire surface being very good, the expenditure and effort necessary for delivering the fluid does not exceed or is even lower than in known means of this type. In addition, a method is to be given for the manufacture of the device according to the invention.
The device according to the invention comprises a coarsely porous shaped part, whose surface, at the point where the fluid flows through it, carries a finely porous surface layer and on the other surface areas fluid-impermeable closing means, which are interrupted by at least one duct connection opening. At least the coarsely porous shaped part and the finely porous surface layer are in the form of a plastic body through which passes a three-dimensional network of pores, which pass in finer, but continuous manner from the shaped part into the surface layer and to the outer surface thereof. The fluid-impermeable closing means can be constructed as pore-free closing layer for the same plastic body or can be a separate part linked by suitable means with the plastic body.
The coarsely porous shaped part, the finely porous surface layer and optionally the pore-free closing layer advantageously are made from the same cured plastic, in which are incorporated in the vicinity of the surface layer smaller particles, in the vicinity of the shaped part larger particles and in the vicinity of the closing layer no par
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Hiraoki Takahashi, Casting Mold and Manufacture Thereof, Patent Abstracts of Japan vol. 14, No. 10 (M917) Jan. 10, 1990, Appl. No. 63-85589 of Apr. 1988, Inax Corp.) 1 page.
Farley Walter C.
Kuhns Allan R.
Unipor AG
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