Fluid handling – Ambient condition change responsive – For controlling soil irrigation
Patent
1980-06-23
1983-07-19
Chambers, A. Michael
Fluid handling
Ambient condition change responsive
For controlling soil irrigation
137 79, 251 44, 47 485, F16K 1736
Patent
active
043938906
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to an automatic regulating device for an irrigation system.
BACKGROUND OF THE INVENTION
From the Swedish patent specification No. 353,210 it is known to provide irrigation apparatus connected to a water pipe with an automatic regulating device by means of which irrigation is coupled in for periods with adjustable length broken by waterless periods with a length dependent on the relative humidity of the surrounding air.
The known device comprises a main valve with a valve body formed as a differential piston having a small-bore central through duct to its major side a duct from this major side to a control valve which is arranged to close and open the main valve when it closes and opens said duct, as well as a pivoting means with an open bowl arranged to be supplied with water from a drop means controlled by the control valve and, as soon as the supplied amount of water has reached a limiting value to tip over and thereby actuate the control valve by a projecting portion such that it closes the main valve and the water flow to the drop means, keeping them closed until sufficient water has evaporated from the bowl so that the tipping means tips back again, the projecting portion disengaging the control valve so that the latter reopens the main valve and the water flow to the drop means.
It has been found desirable to arrange that irrigation takes place substantially at night, and that the length of the waterless periods will also be dependent on rainfall.
The present invention relates to a method fulfilling precisely these desires and an apparatus for carrying out the method.
The invention is described in detail hereinafter.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is clarified by the appended drawings in which:
FIG. 1 is a longitudinal section through an embodiment of a device in accordance with the invention, in a position for irrigation.
FIG. 2 illustrates a portion of the embodiment shown in FIG. 1 in a closed position.
FIG. 3 is a section along the line III--III in FIG. 1 and
FIG. 4 is a section along the line IV--IV in FIG. 2.
DETAILED DESCRIPTION
A casing 11 enclosing the device is put together from two parts which slide into each other with a substantially flat bottom 21 having perforations 22 and a roof 33 provided with a rainwater collecting depression 12, the substantially flat bottom of which is provided with perforations 13.
The bottom 21 carries a main valve 1, with an inlet 2 projecting out of the casing 11 and arranged for connection to a water pipe (not shown), as well as an outlet 3 arranged fo connection to an irrigation apparatus, (not shown). The main valve 1 comprises a valve body 4 (FIG. 3) formed as a differential piston with a narrow gauge central bore 5 to its major side, from which a duct 6 goes substantially vertically to a control valve 7 with a vertical spindle 25 having a float 26 fastend thereto. The float is surrounded by an upwardly open circular bowl 27 with an overflow 28 and a side opening 29. The wall 34 of the bowl 27 diverges upwardly. A cover 30 with a central opening for the spindle 25 is provided with a dependent rim 32 fitting rotatably in the bowl 27 and with a narrow groove 31 opposite the side opening 29 of the bowl 27. The width of the groove 31 substantially corresponds to that of the side opening 29. Together, they constitute a through passage to a drop means 9 formed with a nose or spout and the cross-sectional area of said through passage can be regulated by turning the lid or cover 30 in the bowl 27.
In the casing there is a pivoting means, consisting of two bowls 8, 14 with a common flat bottom 16, one on either side of a pivoting shaft 35. Of these bowls, the one 8 is upwardly open and situated under the casing depression 12 and under the drop means 9. The other bowl 14 carries a closed air chamber 15 from the roof of which a projection 10 formed as an arm extends in over the spindle 25. The air chamber 15 is connected to the open bowl 8 by means of a narrow transverse slit 17 adjacent the co
REFERENCES:
patent: 2965117 (1960-12-01), Gallacher
patent: 3006554 (1961-10-01), Harris
patent: 3224676 (1965-12-01), Rauchwerger
patent: 3422833 (1969-01-01), Kitrilakis
patent: 3696827 (1972-10-01), Sterlich
patent: 3900134 (1975-08-01), Larson
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