Fluid sprinkling – spraying – and diffusing – With cleaning means – drip collecting – waste disposal or soil... – Nozzle cleaner – flusher or drainer
Patent
1990-11-08
1992-10-13
Shaver, Kevin P.
Fluid sprinkling, spraying, and diffusing
With cleaning means, drip collecting, waste disposal or soil...
Nozzle cleaner, flusher or drainer
239468, B05B 1502
Patent
active
051543516
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention concerns a nozzle which is used in pressure-water flotation clarifiers to release the air dissolved in the water under pressure as bubbles of a size suitable for the flotation process.
DESCRIPTION OF THE BACKGROUND ART
The process to which the invention is related is in itself known, and it is based on Henry's law, i.e. the solubility of a gas in a liquid is proportional to the partial pressure of the gas. In pressure-water flotation clarifiers, this is utilized by dissolving air into water at a pressure of about 2 to 8 bars. This water, saturated with air, is passed to the flotation clarification basin through pressure reduction members. When the pressure in the water flow is suddenly lowered, air is released as small bubbles. The air bubbles adhere to the solid particles to be removed and raise them to the surface of the water to be clarified.
SUMMARY OF THE INVENTION
The function of the pressure reduction member, for which the designation dispersion water nozzle is used in connection with the present patent application, is: is released from the water on reduction of pressure, and possible. operates as the pressure reduction part as well as an equalizing part, such as an expansion means or member.
The invention is expressly concerned with the construction of a flow throttle operating as a pressure reduction part.
As is known in the prior art, needle valves, diaphragm valves, globe valves, or fixed holes made from metal or plastic have been used as a throttle.
As an expansion member, tube parts or labyrinths made from plastic or metal are used.
Nozzles of different types have different properties in operation. The air bubbles produced must be of correct size. If the bubbles are excessively large, the rising speed of the bubbles is excessively high, turbulence is produced which disintegrates flocks, and large bubbles do not adhere to the flocks. On the other hand, if the bubbles are too small, their rising speed is too slow.
With nozzles based on needle valves as well as with labyrinth nozzles, a good operating efficiency can be obtained, which means high proportion of bubbles of correct size. On the other hand, the efficiency of nozzles based on diaphragm valves and globe valves is poor. Of the bubbles produced, a high proportion consists of either too small or too large bubbles to produce an adequate flotation effect. In the case of such valves, for a certain flotation effect a larger amount of dispersion water is required than with nozzles of higher efficiency.
However, it is a problem in nozzles based on needle valves and in labyrinth nozzles that they are blocked. Impurities, aluminium hydroxide deposit, etc. block the nozzles in the course of time. Cleaning of the nozzles is time-consuming and causes interruptions in production. What is of concern in the blocking of a nozzle is express blocking of the throttle part.
By means of a dispersion water nozzle in accordance with the present invention, an essential improvement has been obtained for this problem of blocking, while the bubble formation properties of the nozzle have, however, been maintained at least at the level of the prior-art needle-valve-based or labyrinth-based nozzles.
According to the basic idea of the invention, as the throttle part in the dispersion water nozzle, a member is used which is characterized in that it is a body which is rotationally symmetric in relation to at least one axis, and which is mounted rotatably around the axis of rotation in a housing provided with a flow opening perpendicular to the axis of rotation, and which throttle member is provided with two flow ducts, which are of different cross-sectional flow areas and which are perpendicular both to the axis of rotation and to each other.
The particular features of the invention come out from the accompanying patent claims. Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description a
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patent: 4778111 (1988-10-01), Leap
patent: 4819892 (1989-04-01), Rosenberg
Shaver Kevin P.
Weldon Kevin P.
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