Fluid handling – Flow affected by fluid contact – energy field or coanda effect – Means to cause rotational flow of fluid
Patent
1993-03-09
1994-04-19
Chambers, A. Michael
Fluid handling
Flow affected by fluid contact, energy field or coanda effect
Means to cause rotational flow of fluid
137811, 137813, F15C 116
Patent
active
053037820
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a flow controlling device for a discharge system, such as a drainage system, comprising a first vortex chamber with an inlet and an outlet and a second bigger vortex chamber with a peripheral inlet and a central outlet axial in relation to a vortex in this chamber, said second vortex chamber being at its inlet connected to the outlet of the first vortex chamber.
2. Prior Art
Such a flow controlling device is known from the accepted SE specification no. 457,121 and the corresponding WO-A-87/07048. Other flow controlling devices are known from the accepted DK specification no. 135,904, published GB specification no. 2,141,561 and U.S. Pat. Nos. 4,206,783 and 4,679,595. From these publications it is known to brake the flow of a liquid by leading it tangentially into a housing with an essentially circular cross section and which forms a vortex chamber. Common for these devices are that it is a prerequisite for the information of vortices and consequently for the establishing of the braking or controlling effect that the inlet flow into the vortex chamber takes place essentially perpendicular to the outlet flow dependent on the construction of the vortex chamber.
Within the field of controlling the flow of liquids and in particular within the environment sector there is an increasing need for not only a possibility to change the capacity by adjusting a controlling device but to an even higher degree a need for a possibility to control even smaller liquid flows than usual by means of a controlling device with a favourable characteristic and an acceptable cross section of the flow, clogging on account of solid or viscous impurieties in the liquid being thus avoided.
OBJECT OF THE INVENTION
The object of the invention is thus to provide a flow controlling device, which in comparison with the known controlling devices has a bigger braking effect in relation to the cross section of the flow.
Furthermore, it is an object of the invention to provide a flow controlling device, which makes it possible for the inlet and the outlet to have essentially the same direction or to be placed in series.
SUMMARY OF THE INVENTION
To meet these objects the flow controlling device differs from the known ones in that the first vortex chamber is symmetrical with respect to a median plane perpendicular to the vortex axis (A), that the direction of both the inlet and the outlet is parallel with this plane, that the first vortex chamber with inlet and outlet is asymmetric with respect to a plane parallel with the inlet direction and perpendicular to said median plane, that the vortex axis (A) of the first vortex chamber is perpendicular to the tangent of the second vortex chamber at the inlet and that the ratio between the diameters of the first vortex chamber and the second vortex chamber is less than 0.43:1. Thereby it is achieved that the jet of liquid running into the first vortex chamber, on account of a vortex created due to the asymmetry in this chamber, will be contracted and accelerate and flow diagonally out through the outlet of this first vortex chamber. The jet thus flows essentially tangentially into the second vortex chamber at great velocity and with a very small cross section in relation to the inlet opening, this second chamber getting thereby a high braking effect in relation to the cross section of the flow passage.
According to an embodiment of the invention the first vortex chamber is an essentially disc-shaped hollow space, the inlet and outlet of which are essentially positioned on a common axis, and in which in the inlet at one side of a plane through the inlet and the outlet and perpendicular to the plane of the disc a protrusion is provided. By this embodiment it is achieved that a strong flow of liquid in the inlet to the first vortex chamber is influenced by a considerable deflection power, which is essentially enhanced by a vortex created behind the protrusion and which forces the flow of liquid towards the peripher
REFERENCES:
patent: 3207168 (1965-09-01), Warren
patent: 3323550 (1967-06-01), Lee, II
patent: 3461897 (1969-08-01), Kwok
patent: 3513865 (1970-05-01), Van Der Heyden
patent: 4679595 (1987-07-01), Johannessen
patent: 5076327 (1991-12-01), Mettner
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