DE1582735A1 - Arrangement for the sunshine-dependent control of spray systems - Google Patents

Description

GUSTAV F. GERDTS KG

BREMEN '. BREMEN, April 18, 196-7

Arrangement for the sunshine-dependent control of spray systems

The invention relates to an arrangement for those dependent on the sun Control of spray systems, in particular for plant crops.

The known arrangements of this type provide for control by means of piezoelectric pulse generators and solenoid valves. Farther spray systems are known whose control pulse directly the air humidity or the humidity of a so-called "artificial leaf" is taken, or where a time-dependent electrical control is carried out by time switches.

These known arrangements are proportionate because of the multiple pulse ur ^ .v-ndlur.g and gain required "expensive and flow ^ prone, in which case only time-dependent control also the result is not satisfactory.

The invention has set itself the task of eliminating the disadvantages mentioned to eliminate. According to the invention, the task is set solved in that the control pulse for the flow of the Spr ^ hv / assers controlling valve by a plüssigkeit- or Fectctcffther ::. Ostat & rL is generated, its more heat sensitive Part of it is influenced by solar radiation.

As actuated by the Hubbowcigung acc by solar radiation Thermostats immediately prepare a mechanical stop pulse is generated, there is no need for complicated conversion:; and precise control adapted to the changing conditions is achieved at the same time.

Another aspect of the invention is that the im-

coil of a second thermostat of any type, which only Exposed to the ambient temperature, plumb, your stroke

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of the "herbostat" influenced by solar radiation with increasing ambient temperature counteracts. This will make the Influence of the ambient temperature on the 'exposed to solar radiation' thermostat easily balanced so that only the heat radiation of the sun serves as an impulse.

Another feature of the invention is seen in the fact that water spray when flowing out the expansion material of the solar radiation influenced thermostats cooled by a heat exchange device and thereby limits the spray duration. As a result, the duration of the spraying process is limited to a particularly simple method.

Another feature of the invention is that a mix dem thermostats affected by solar radiation. 'Shaft engages on one side of the shut-off element of the valve and this influences in the opening direction, while a mix dem Second thermostat connected shaft engages on the other side of the shut-off element and affects this in the closing direction.

Another IJarkmal of the invention is that on the Low pressure side of the body of the valve, the supply line to a The cooling coil opens inside the on the top of the Valve housing provided, is arranged by the solar radiation influenced thermostat and the return line behind the supply line opens into the low-pressure side again.

The drawing shows the embodiment of a device according to the arrangement according to the invention.

Occurs the flow of Sprühwcsser zv ~ influence of humidity, for example, a greenhouse, and the surface moisture of the plants by a valve 1. The spray water flows into the Eintrittoctutzen 2, through the flow passage 3, which is controlled by a shut-off device 4, and leaves the valve 1 via an outlet valve 5, which is connected to the spray lines vv, ä spray nozzle, not shown here.

The shut-off element 4 is activated by a valve 1 on top ordered, for example spherical, the solar radiation

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exposed evaporation thermostat 6 when it is heated influenced in the opening direction via the working bellows 7 and the shaft 8.

Between operating bellows 7 and 8, a shank idle stroke is provided so that a pulse is generated not already by an ^"r Slee expansion of the liquid before the evaporation of the expansion medium.

Expediently, the surface 9 of the evaporation thermostat 6 is designed in such a way that the thermostat receives the energy which absorbs solar radiation particularly easily and releases it with difficulty, while other temperature influences only comparatively act slightly on him.

Of course, instead of an evaporation thermostat a thermostat with a melting material can also advantageously be used.

Sin more of the solar radiation not directly accessible Thermostat 10, of any design, is provided on the underside of the valve 1 and influences the shut-off element Via an intermediate each 11 and a shaft 12 in the closing direction. The bias of the spring 11 is about a Hand screw 13 adjustable, the air through openings a G-ehäusekappe 15 to the thermostat 10 has access.

Increases e.g. 3. the air temperature, so will the evaporation thermostat 6 at a given radiation intensity of the sun is more extensive than this at a lower air temperature of the Case would be. Correspondingly, however, the expansion of the counteracting thermostat-10 also takes place, so that the action of the Air temperature on the evaporation thermostat 6 is canceled again will.

In order to limit the spraying time, part of the rinse water, which after the shut-off element 4 has been opened, it enters the drain connection 5, via a cooling coil 16 through the interior of the evaporation thermostat 6, whereby the expansion material is cooled and the shut-off element 4, if necessary, even if it continues of sunshine is closed. To achieve a sufficient pressure difference between the supply line 17 and the

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Return line 18 of the cooling coil 16 is between the Zinmiin fertilize both lines 17 and 18 in the drain port 5 a Iris 19 switched on.

Of course, it is possible to irrigate the soil of crops with the spray system. For this purpose, for example, the impulse from a hygrometer located in the floor is amplified to a solenoid valve, which opens the shut-off device 4 via a lever, for example. For this it is necessary that the lever is non-positive acts on the shaft 8 or 12 or the shut-off element 4 from above. As long as the frictional connection is canceled, the works Spray system thus independent of the impulse of the hygrometer.

For the purpose of using the device according to the invention in a The working bellows 7 of the evaporation thermostat, for example with a contact switch, can of course be used as a shading system which influences blinds or similar via a relay, through which the solar radiation from the Inside the greenhouse in question is kept away and thus the relative humidity is influenced.

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Claims (12)

Patent claims: 1. Arrangement for the sunshine-dependent control of spray systems, especially for plant crops, thereby g e k e η η ζ e i c h η e t that the control pulse for the den The flow of the spray water controlling valve (1) is generated by a liquid (6) or pesticide thermostat, · · its heat-sensitive part (9) from solar radiation being affected. 2. Arrangement according to claim 1, characterized e i c'h η e t, dal the momentum of a second thermostat ('G) of any kind, which is only exposed to the ambient temperature, the actuating pulse of the Solar radiation. Influenced thermostat (6) with increasing I '.;. Temperature counteracts. 3. Arrangement according to claim 1 and 2, characterized in that the spray water as it flows out cools the expansion material of the thermostat (S) influenced by solar radiation via a V / heat exchange device (16) and thereby limits the spray duration. 4. Device according to the arrangement according to claim 1 to 3 »characterized in that one with the influenced by the solar radiation thermostat (6) connected shaft (8) on one side of the shut-off device (4) of the Valve (") attacks and influences this in the opening direction, while one connected to the second thermostat (10) Shank (12) engages on the other side of the shut-off element (4) and this influences in the closing direction. 5. The device and arrangement according to claim 1 to 4, characterized ^ that dor of the The thermostat (6) influenced by solar radiation is spherical and its outer surface (9) by suitable surface formation, z.3. Paint coatings, by vapor deposition of . Gold or poor metal + e or through the surface board * Education itself has a great capacity for solar radiation - 2 - 009832 / D3 71 BADORiGiNAl is granted at low abstraction, the power transmission on the shut-off element (4) through a working bellows (7). 6. Device and assembly according to claim 1 to 5, as ä ur ch in that for the radiation from the sun influenced thermostat (6) in a known Y, ^r an expansion material is provided else, the under his Aggregatzusiand upon exceeding a predetermined temperature Volume increase changes. 7.. Device and arrangement according to Claims 1 to 6, characterized characterized in that the thermostat (6) influenced by the solar radiation is non-positive cooperates with the shut-off element (4) with the interposition of an idle stroke. 8. »Device and arrangement according to claim 1 to 7, characterized in that on the low pressure side (5) of the housing of the valve (1) the supply line (17) opens to a cooling coil (16) which is located within the uo'x top of the valve body provided ·, from solar radiation influenced thermostat (6) is arranged and the return line (13) behind the supply line (17) in the Xiecer pressure side (5) joins again. 9. Apparatus according to claim 8, characterized in that between the confluence of the supply line (17) and the buck line (18) turned on a diaphragm (19) is. 10. Apparatus according to claim 8 and 9 »characterized in that that the flow cross-section of the supply line (17) or return line (18) is adjustable. 11. The device and arrangement according to claim 1 to 10, characterized in that the second Thermostat (10) on the underside of the valve £ eh: iU3os (1) is provided. 3 - SAD 009832/03 71 12. The device and arrangement according to claim 1 to 11, d a dur ch marked that the shut-off device. (4) of the valve (1) in the opening direction is additionally influenced by force-locking means which in turn controlled in a manner known per se via a relay by a hygrostat that senses the soil moisture will. 009832/0371 Blank page