Screening device for eliminating balls from a coolant line

Details Screening device for eliminating balls from a coolant line Screening device for eliminating balls from a coolant line

1998-12-18

2001-05-01

Flanigan, Allen (Department: 3743)

Heat exchange

With cleaning means for heat exchanger

C015S003510

Reexamination Certificate

active

06223809

ABSTRACT:

The invention relates to an apparatus for eliminating balls for cleaning the tubes of a heat exchanger, condenser or the like from a coolant line, comprising
the coolant line having a wall,
a screen being fixed to the wall of the coolant line and being located in the outlet area of the heat exchanger,
the screen (
2
) being able to cover the free cross-section of the coolant line for collecting the balls and
progressively restricting the free cross-section For the coolant for the collection of the balls in the cooling medium flow direction and
a removal line,
positioned in the flow direction of the cooling medium behind the screen in such a way that
the balls collected by the screen are passed into the removal line and leave the coolant line via the removal line,
the screen passing in funnel-shaped manner from the wall of the coolant line to the opening of the removal line,
openings for the outlet of cooling medium being located in the removal line in the coolant line.
In a known apparatus of this type —DD 218 168 A1— the removal line is connected to the funnel-shaped screen by a closed first section of the removal line. Downstream this section of the removal line has an oblique open end which is arranged under an angle with regard to the flow direction of the cooling medium and which is covered with a grid being connected to the edge of the wall of the removal line surrounding the opening. At the wedge-like lower end of the open end of the downstream end of the removal line a suction tube is connected which has a small diameter and which serves to remove the balls from the grid to an outlet . Accordingly the balls being collected in the funnel-shaped screen and the cooling medium flowing in the middle area of the coolant line have to pass the closed first section of the removal line until they reach the grid where a main portion of the cooling medium passes the grid in the flow direction of the cooling medium while the balls which are to be removed via the suction tube tend to be pressed to the grid under the pressure of the cooling medium passing the openings of the grid.
In other known apparatus of this type, e.g. for heat exchangers, for eliminating the balls from the coolant line use is made of screens mounted in rotary manner and whose screen faces are so inclined in the active position relative to the flow direction that the balls pass via the screen surface to an outlet in the coolant line, from where they are transported away by means of the removal line and a pump and are returned to the inlet area of the heat exchanger. If the screens are pivoted into an inactive position, the coolant flows in unimpeded manner through the screens, which are flushed back and consequently freed from adhering dirt.
In smaller heat exchangers the known apparatus comprising screening devices make the plant much more expensive due to the complicated construction, the drive and the control of the movable screen parts, as well as the sealing thereof.
Thus, the problem exists of obtaining a less expensive construction for the screening device of the apparatus.


REFERENCES:
patent: 3021117 (1962-02-01), Taprogge
patent: 4556102 (1985-12-01), Bochinski et al.
patent: 4974662 (1990-12-01), Bizard
patent: 1238939 (1967-04-01), None
patent: 58-208598 (1983-12-01), None
patent: S8-208598 (1999-11-01), None

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