DE202004007578U1 - Multi-way valve for greenhouse watering systems has piston moving between closed and open position to allow flow through watering pipe, spring plate being mounted on top of piston rod and acting as supplementary piston - Google Patents

Abstract

The multi-way valve for greenhouse watering systems has a piston (6) which moves between a closed (12) and open (13) position to allow flow through the watering pipe (4). A spring plate (19) is mounted on the top of the piston rod (7) and acts as a supplementary piston.

Description

The Invention relates to a multi-way valve for the irrigation of greenhouse table systems with a T-shaped valve body that an inlet pipe connected to a pressure source, one to the individual Greenhouse table connected conveyor pipe and has a drain pipe connected to the reservoir, wherein in the intersection of the two processes one of a closed position in an open position Movable piston adjustable against the action of a compression spring is.

On Multi-way valve designed in this way is known from DE -.... The The piston is in the starting position under the action of Compression spring in the so-called closed position, in which the Greenhouse tables water can flow freely back into the reservoir. If the amount of water in the inlet pipe is under pressure from the pressure source, the piston is against the action of the compression spring from the closed position in the open position offset, thereby blocking the drainage of the liquid into the reservoir and the pumped in the inlet pipe Amount of water through the area of intersection between the delivery pipe and the drain pipe can flow towards the greenhouse tables.

In dependence of an adjustable time that is thought to be irrigation of greenhouse table systems is sufficient, the pressure source is put out of operation. On the Pistons now act on two opposite forces, namely the spring force of the tensioned Compression spring on the one hand and the back pressure the water in the intersection of the delivery pipe and the drain pipe. If the restoring force the compression spring is larger than the back pressure, then the piston returns to the original closed position back, so that now the water from the greenhouse table systems under the static back pressure can get into the drain pipe to the reservoir.

This Function assumes that the greenhouse tables are on level ground are so that a back pressure of approx. ... m water column.

In in practice, there are structural problems that make it impossible all greenhouse tables to bring it into a flat position. In many cases, for example Inclinations of 2–3% of the ground, which means that the back pressure resulting from the higher Greenhouse tables can increase significantly. Now it shows that the compression spring despite Turning off the delivery pressure the pressure source is no longer able to move the piston out of the open position in the closed position back to move because of the back pressure in the conveyor pipe and is still too big in the intersection area.

you has managed the restoring force the compression spring by stronger Enlarge dimensioning. In order to it was possible to move the piston back into the closed position against the back pressure. But now another problem arose because of the reinforced compression spring it is no longer possible was, the piston from the closed position in the open position under the discharge pressure to move the pressure source, if, as mentioned at the beginning, the backpressure in the conveyor pipe is too big.

Here now sets the object of the invention, which in principle in it exists to change the previously known multi-way valve so that it also results in an inclined position when the back pressure increases considerably the greenhouse table works flawlessly and despite the increased compression spring the movement the piston from the closed position in the open position and back allows.

According to the invention Task solved by that the inlet end of a piston rod connected to the piston has a spring plate acting as an additional piston, the edge is distanced from the inner wall of the inlet pipe.

The Invention with this proposal assumes that the compression spring so amplified is that when the discharge pressure is removed the pressure source is able to move the piston out of the open position in the closed position back to move. If now an irrigation of the greenhouse table systems should be under the discharge pressure the pressure source, the piston rod is in the open position despite the reinforced compression spring brought so that the funded Water above the conveyor pipe in the greenhouse table system can reach. This assumes that the piston is effective in the open position remains and thus avoids the drainage of water into the reservoir. The piston rod thus has two pistons, namely the previously known piston, the from the closed position in the open position to be brought and also the spring plate acting as an additional piston, the the flow pressure is exposed to the pressure source from the front. The scope of this spring plate is opposite the inner surface of the inlet pipe is therefore distanced in order to have sufficient flow to act on the actual piston lengthways to allow the piston rod.

This and further details of the invention are schematic in the drawing and shown for example. Show it:

1 : a vertical section through a Mehrwe state-of-the-art valve,

2 : a vertical section through the multi-way valve in an intermediate position of the piston and

3 : a vertical section through the multi-way valve of the 1 with a spring plate acting as an additional piston.

In the examples of 1 - 3 is a multi-way valve ( 1 ) with a T-shaped valve housing ( 2 ) as part of an irrigation system for greenhouse table systems shown in vertical section. The system of the aforementioned irrigation is known from the prior art mentioned at the outset, so that the invention can be limited to the design and function of the multi-way valve ( 1 ) as part of this irrigation system.

The T-shaped valve housing ( 2 ) has an inlet pipe ( 3 ), a conveyor pipe ( 4 ) and a drain pipe ( 5 ) on. The conveyor pipe ( 4 ) leads to the individual tables of the greenhouse table system, whereby it can branch out and supply several tables. The drain pipe ( 5 ) leads to a water reservoir from which the pressure source, not shown, can draw off the water.

In the intersection area ( 11 ) between the conveyor pipe ( 4 ) and the drain pipe ( 5 ) is a piston ( 6 ) from a closed position ( 12 ) in an open position ( 13 ) movable. In the closed position ( 12 ) according to 1 the inflow of water from the inlet pipe ( 3 ) both to the delivery pipe ( 4 ) as well as to the drain pipe ( 5 ) blocked. This position is confirmed by a compression spring ( 8th ) determines which on a piston rod ( 7 ) and the piston ( 6 ) acts, whereby the piston rod ( 7 ) in a fixed tour ( 9 ) inside the inlet pipe ( 3 ) is movably guided. This tour ( 9 ) has breakthroughs ( 10 ) so that the delivery pressure in the inlet pipe ( 3 ) on top of the piston ( 6 ) can act.

With ( 15 ) is an arrow to show the direction of inflow of water under the effect of the pressure source. This inflow comes through the breakthroughs ( 10 ) on top of the piston ( 6 ) and causes the piston ( 6 ) from the in 1 shown closed position in the in 3 shown open position ( 13 ) to move. This piston movement enables water from the inflow direction according to arrow ( 15 ) in the direction of flow according to arrow ( 16 ) for irrigation of the greenhouse table systems. On the other hand, it is avoided that the 4 ) water in the drain pipe under the given pressure conditions ( 5 ) and thus into the reservoir according to the arrow ( 17 ) can flow back. On the piston ( 6 ) different forces therefore act, namely on the one hand the delivery pressure p1 through the pressure source in the inlet pipe ( 3 ), the restoring force of the compression spring ( 8th ) and the back pressure p2 in the delivery pipe ( 4 ).

If the pressure source is switched off due to time, the delivery pressure p1 drops so that only the back pressure p2 in the delivery pipe ( 4 ) and the restoring force of the compression spring ( 8th ) counteract each other. If the restoring force of the compression spring ( 8th ) is greater than the back pressure p2, the piston ( 6 ) unhindered from the position according to 3 in the closed position according to 1 back so that excess water enters the drain pipe ( 5 ) can flow back.

But if the back pressure p2 in the delivery pipe ( 4 ) is greater than calculated, for example due to the inclined position of the greenhouse tables, then the force of the compression spring is sufficient ( 8th ) no longer move the piston from the open position ( 13 ) according to 3 in the closed position ( 12 ) according to 1 to move back. One is therefore forced to change the dimension of the compression spring ( 8th ) to enforce this closing movement.

However, it now turns out that the delivery pressure p1 is too low due to the pressure source in order to increase the pressure spring ( 8th ) to overcome in their restoring force. This creates an intermediate position of the piston ( 6 ) according to 2 , whereby the water under the delivery pressure p1 of the pressure source partially into the delivery pipe ( 4 ) according to arrow ( 16 ), but from this conveyor pipe ( 4 ) according to arrow ( 18 ) can flow back because the piston ( 6 ) the open position ( 13 ) according to 3 has not reached. This results in inadequate irrigation of the greenhouse table systems because the pumped water can flow back immediately. This effect is due to the fact that ( 4 ) there is an increased back pressure p2, caused by the inclination of the greenhouse tables.

If you now according to 3 with the inflow end of the piston rod ( 7 ) a spring plate acting as an additional piston ( 19 ) connects, whose circumference from the inner surface of the inlet pipe ( 3 ) is distanced, then it is possible to use the delivery pressure p1 in the inlet pipe ( 3 ) the piston ( 6 ) despite reinforced compression spring ( 8th ) from the closed position ( 12 ) according to 1 in the open position ( 13 ) according to 3 to move. The inflow according to arrow ( 15 ) of the in the feed pipe ( 3 ) water acts on both the spring plate ( 19 ), as well as the piston ( 6 ). Both pressure forces are greater than the restoring force of the pressure spring ( 8th ), even if it is reinforced, and it can also not according to an intermediate position 2 come at which the high Back pressure according to p2 the piston ( 6 ) in the open position ( 13 ) to get.

The invention thus proposes a multi-way valve ( 1 ) that both with ideally arranged greenhouse table systems and with systems arranged on an inclined plane works perfectly.

1

Multi-way valve

2

T-shaped valve body

3

supply pipe

4

delivery pipe

5

drain pipe

6

piston

7

piston rod

8th

compression spring

9

Guide for piston rod

10

pressure refractions

11

crossing area

12

closed position

13

open position

14

intermediate position

15

arrow inflow

16

arrow material flow to the greenhouse table

17

arrow Drain to the reservoir

18

arrow backflow from the greenhouse table

19

spring plate (Auxiliary piston)

20

threaded nut

p1

delivery pressure the pressure source

p2

backpressure in the conveyor pipe

Claims (1)

Multi-way valve ( 1 ) for the irrigation of greenhouse systems with a T-shaped valve housing ( 2 ) which has an inlet pipe connected to a pressure source ( 3 ), a conveyor pipe connected to the individual greenhouse table ( 4 ) and a drain pipe connected to the reservoir ( 5 ), whereby in the crossing area ( 11 ) of the two processes ( 4 . 5 ) from a closed position ( 12 ) in an open position ( 13 ) movable piston ( 6 ) against the action of a compression spring ( 8th ) is adjustable, characterized in that the inlet end of a piston ( 6 ) connected piston rod ( 7 ) a spring plate acting as an additional piston ( 19 ), the edge of which extends from the inner wall of the inlet pipe ( 3 ) is distant.