Automatic dry granular chemical dispenser

Details Automatic dry granular chemical dispenser Automatic dry granular chemical dispenser

2000-06-05

2001-02-06

Lee, Kevin (Department: 3753)

Fluid handling

With holder for solid, flaky or pulverized material to be...

C422S278000, C422S282000

Reexamination Certificate

active

06182681

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to a dispenser of dry granular chemicals and more particularly to a dispenser of measured quantities of granular chemicals capable of releasing chlorine into swimming pool water.
BACKGROUND TO THE INVENTION
In order to maintain swimming pool water clear and suitable for pool users chemicals must be added to the water. The most usual chemical used to control undesired organic growth in the pool is chlorine. The chlorine is derived from granular sodium hypochlorite. This should be introduced into the pool in dosed quantities and at regular intervals. Usually this granular materiel is introduced by hand though there have been proposals to do this automatically.
One of the problems is to prevent moisture contacting the granules other than at the time of introduction into the pool water and to dose the water at regular intervals without the use of complicated mechanisms and electrical circuits.
OBJECT OF THE INVENTION
It is the object of this invention to provide a dispenser which is effective and will automatically meet the dosing requirements for a swimming pool using standard pool filtration equipment to cause and control operation of the dispenser.
SUMMARY OF THE INVENTION
In accordance with this invention there is provided a granulated chemical dispenser comprising a conduit providing an open ended liquid flow passage, subsidiary inlet and outlet openings to and from the conduit spaced apart along its length, means for introducing an area of low pressure at the subsidiary inlet, the subsidiary outlet opening into a vented chamber connected to a mixing chamber having a dosing compartment opening into the top of the chamber, ganged valves for controlling an inlet and an outlet to and from the compartment, the mixing chamber having an outlet connected to the conduit subsidiary inlet and means for operating the ganged valves on liquid flow through the passage and reversing this operation on the cessation of flow through the passage.
Further features of this invention provide for the compartment inlet to have means for connection to a supply of granular chemicals and the conduit means for connection into a liquid flow supply line, more particularly a return flow supply line from a swimming pool filter installation.
The invention also provides for there to be a holding chamber between the mixing chamber and the subsidiary inlet, for the vented chamber including baffles to smooth the flow therethrough, for the ganged valves to open the inlet to the compartment when the outlet is closed and vice versa and for the valve operating at the compartment inlet to carry a projection extending through the inlet.
Still further features of this invention provide for the means for inducing low pressure in the conduit at the subsidiary inlet to be a venturi or a jet pump.
The invention provides for the means for operating the ganged valves to be a float operating in a cage below the mixing chamber with a control rod extended to the ganged valves or through an hydraulic piston and cylinder assembly, a diaphragm arrangement or an electric solenoid assembly or even a combination of these mechanisms.
The three chambers may be made to be in line along the conduit or concentric with each other.


REFERENCES:
patent: 3626972 (1971-12-01), Lorenzen
patent: 3710817 (1973-01-01), Lorenzen
patent: 4005806 (1977-02-01), Baldwin
patent: 4420394 (1983-12-01), Lewis
patent: 5053206 (1991-10-01), Maglio et al.
patent: 5178181 (1993-01-01), Craig
patent: 5743287 (1998-04-01), Rauchwerger
patent: 5827434 (1998-10-01), Yando
patent: 0527027 (1993-02-01), None

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