Fluid handling – With casing – support – protector or static constructional... – Static constructional installations
Patent
1990-04-02
1991-03-19
Chambers, A. Michael
Fluid handling
With casing, support, protector or static constructional...
Static constructional installations
137582, 405127, 52 20, F16L 500
Patent
active
050002171
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an apparatus for keeping a rain water well unfrozen, which well comprises a cover, walls and an outlet, which defines an air space of the well above the outlet and a water space of the well below the outlet. By means of the apparatus of the invention, heat losses of the rain water well can be minimized without risking the flow capacity of the rain water well at all.
According to the present practice, the whole surface area of the water in a rain water well is in contact with open air. Then the well freezes relatively easily under the joint influence of wind and frost. The object of the present invention is to get rid of this drawback and to provide an apparatus by means of which the contact surface between the open air and the water in a rain water well can be minimized. This is achieved by means of an apparatus of the invention in such a way that the apparatus comprises a funnel positioned under the cover of the well and a flow tube, the cross section of which is substantially smaller than the diameter of the well and which tube extends from the lower part of the funnel under the water surface of the well.
According to a very preferable embodiment of the invention, a closed flow plate substantially parallel to the well cover is arranged in the funnel, which plate is broader than the diameter of the flow tube, but narrower than the funnel diameter at the corresponding height. When the water inflow is sufficiently strong, the closed flow plate makes it possible to conduct the water by a closed flow method known per se (Swedish Patent 327806) under the surface of the water space of the rain water well. Due to closed flow, the transfer capacity of the flow tube improves substantially, whereby its diameter can be dimensioned smaller than before.
By means of the apparatus of the invention, the contact surface between the water and the air in the most common well types decreases by approximately 98 per cent with respect to the present surface, and no movable parts are necessary in this apparatus. Tests have proved that the flow capacity of the apparatus is sufficient for the water transmission capacity of the cover of a rain water well with a diameter of 600 mm.
In the following, the invention is explained in greater detail with reference to the example of the enclosed drawings, wherein
FIG. 1 illustrates an apparatus of the invention installed in a rain water well shown in axial section,
FIG. 2 illustrates the apparatus of the invention in axial section, and
FIG. 3 illustrates a funnel of the apparatus provided with a closed flow plate seen from above from the direction of the line III--III of FIG. 2.
FIG. 1 shows a typical rain water well comprising walls 13 defining the well space, a frame 14 installed at the upper edge of the walls and a cover 12 installed in the frame. An outlet 15 fastened to the wall of the well defines an air space 16 of the well above the outlet and a water space 17 of the well below the outlet. The apparatus according to the invention is suspended in a space reserved for the cover in the frame 14.
FIG. 2 shows a cross section of the apparatus of the invention comprising a funnel 1 and a flow tube 5, the cross section of which is substantially smaller than the diameter of the well and which tube extends from the lower part of the funnel below the water surface of the well according to FIG. 1. To the horizontal lower part of the funnel are fastened substantially vertical supporting arms 3 extending upwards, to the upper end of which again is fastened, a substantially horizontal closed flow plate 2 making a generation of closed flow possible. Further, an exit collar 4 extending downwards is fastened to the lower part of the funnel 1 by means of bolts 3a of the supporting arms 3. The flow tube 5 is fastened to the exit collar by means of for instance pop rivets 11a. To the lower end of the flow tube is in a similar way by means of for instance pop rivets 11 fastened a supporting collar 8, on which is installed a protecting tube 7. The space between the protecting t
REFERENCES:
patent: 316567 (1885-04-01), Pierson
patent: 965861 (1910-08-01), Berwanger
patent: 2602465 (1952-07-01), Goehring
patent: 3927534 (1975-12-01), Larson et al.
patent: 4486122 (1984-12-01), Arntyr et al.
patent: 4505814 (1985-03-01), Marshall
Chambers A. Michael
Kiinteistojen LVI-Palvelu ja Suunnittelu H. Armanto KY
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