Lock for balls for cleaning cooling systems

Details Lock for balls for cleaning cooling systems Lock for balls for cleaning cooling systems

1999-04-28

2000-06-06

Leo, Leonard

Heat exchange

With cleaning means for heat exchanger

15 35, F28G 112

Patent

active

06070652&

DESCRIPTION:

BRIEF SUMMARY
DESCRIPTION

1. Technical Field of the Invention
The invention relates to a ball collector for a device for returning balls for the cleaning of the tubes of cooling systems operated with a fluid, preferably water, which are e.g. used in heat exchangers, power station condensers, refrigerating and air conditioning plants, etc., comprising freeable in the open position thereof, chamber by a bypass line having a pump, through which water can be pumped from the upper chamber into the lower chamber.
2. Background of the Invention
A ball collector of the aforementioned type is known from the applicant's German publication G 93 09 320.9. In the case of the known ball collector the opening between the upper and lower chambers is closed and opened by a flap, which is mounted in rotary manner about its centre axis in the opening plane and is adjusted by a motor placed on the casing from the closed to the open position and vice versa. The flap motor requires a control, in order to maintain periodically predetermined cleaning cycles or cycles dependent on the fouling factor of the heat exchanger tubes and in order to bring about the necessary synchronization with the pump motor located in the bypass line.
At the start of a cleaning cycle the flap motor is switched on, so that the flap passes from the closed position into the open position and frees the opening between the upper and lower chambers. The balls collected in the upper chamber sink into the lower chamber, because their specific gravity is slightly above that of water. Following the sinking of the balls into the lower chamber the flap is again motor-closed, e.g. following the operation of a previously set time-lag relay.
The pump in the bypass line is then switched on and its delivery pressure opens the fluid pressure-controlled shutoff member in the discharge line and must additionally overcome the dynamic (line-caused speed losses) pressure heads and the static (.DELTA. p of the condenser) pressure heads of the system. The pump sucks water out of the upper chamber and pumps it into the lower chamber, so that the balls in the lower chamber are conveyed into the discharge line and through the latter to the inlet area of the heat exchanger, where they are taken up by the main cooling water flow. After passing through the heat exchanger tubes, the balls are collected by the strainer in the outlet area of the heat exchanger and passed via the supply line into the upper chamber of the ball collector casing. The transportation of the balls through the discharge line and through the supply line is ensured by the pump in the bypass line, into which no balls can pass, because in the upper chamber a strainer screen is placed in front of the bypass line inlet. In addition, the differential pressure prevailing between the inlet and outlet areas of the heat exchanger acts on the ball-transporting water flow in the supply line and the discharge line.
When all the balls have finished the circulation, the pump is switched off again and the device is ready for the next cleaning cycle.
In the known ball collector the drives of the flap and the pump are operated by sequence controls or circuits. In the rest periods the fluid pressure-controlled valve in the discharge line ensures that no undesired bypass flow of of the heat exchanger takes place.
The known ball collector and the device for returning the balls and in which the ball collector is located require only two drives, namely for the pump in the bypass line and for opening and closing the flap.


SUMMARY OF THE INVENTION

The problem of the invention is to simplify the necessary drives and the associated controls for the ball collector.
According to the invention this problem is solved in that pivotably mounted through the water flow between the open position and the closed position that position and when the pump is switched off its open position.
According to the invention, the flap with which the opening between the upper and lower chambers can be closed and released is not, as in the known ball collector, motor-ope

REFERENCES:
patent: 5630471 (1997-05-01), Taprogge

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