Rotary sprinkler for batch water delivery

Description

[0001] Rotary sprinkler for batch water delivery The invention relates to rotary sprinklers with a timer that activates the water flow. A stationary valve actuating device for the incremental release of water, which is actuated by impulses, e.g. pressure reductions in the sprinkler line. This will happen. Typically, several rotary sprinklers are connected to a common water supply network to irrigate a specific area of ​​ground. to irrigate as evenly as possible. The valve actuators open the valves at times determined by the timer. Sprinklers switched over, interrupting the water output of the currently active sprinkler, while simultaneously the next sprinkler switched on. Operation is being put into operation.

[0002] It is already known to provide a differential piston as a control element for the shut-off device arranged on the jet tube. However, the differential piston is located on the sprinkler itself and also works in conjunction with a pressure chamber, which is also located on the sprinkler itself. is planned.

[0003] Another known embodiment relates to an irrigation system with fixed sprinkler nozzles, but requires a An auxiliary line and a special control device are required to activate the actuating mechanism. The device operates in in such a way that the dead travel of a differential piston opens the valve and a locking device is advanced, which after a a certain number of cycles release the full piston or valve stroke.

[0004] Another known control device operates without an auxiliary line, and the dead travel of the valve stroke is used to control a switching wheel. to rotate by means of an inclined surface of a latch. After A specific number of rotations, combined with a groove in a ring and a lug, enables a full valve lift. Each time the rotation is triggered, a three-way gear must be switched, although this switching does not occur automatically.

[0005] The invention relates to a rotary sprinkler with a valve actuation device which, with each impulse, is actuated by means of the dead stroke. of a differential piston, a locking device of the full valve stroke switches repeatedly until it releases the full valve stroke for an impulse. According to the invention, the shaft of the differential piston in the sprinkler housing is under the action of a compression spring, the tension of which is greater than the Impulse pressure, but lower than the operating pressure in the sprinkler line, and the head of the shaft actuates a spring-loaded ratchet, which is via The ratchet wheel controls the locking lever for limiting the valve stroke.

[0006] The time release device common to all sprinklers is connected to the pumping device or a shut-off valve of the main line. linked to the fact that it causes an impulse-like change, preferably a reduction in pressure, in all sprinklers at certain time intervals. Under the influence of each pressure pulse, the locking wheel in each sprinkler is rotated by one step equal to i / n revolutions, where n is the The number of sprinklers is specified so that the sprinklers are switched on and off in a periodic sequence.

[0007] According to the further invention, the rotary sprinkler is connected to a sprinkler line whose pump motor is a star-delta starter. is a switched three-phase motor; which is briefly disconnected from the delta connection by means of a time release device to generate the pressure pulse. The connection is switched to a star configuration. The motor is then activated by a timer, which can be of any type, e.g., a clock. First, it switches from delta to star connection, causing the motor speed to drop and a pressure pulse to be generated. After a At the desired set time interval, the motor is switched back from star to delta connection by the time release device, thereby The motor speed is brought back to its operating value. The pressure pulse can also be generated in other ways, e.g. by... The timer affects a main shut-off valve, which temporarily reduces the water pressure.

[0008] An embodiment of the invention is explained in more detail with reference to the schematic drawing, which shows a rotary sprinkler in side view. showing a valve actuation device partially depicted in vertical section.

[0009] A number of rotary sprinklers are connected to the sprinkler line i, which are actuated by impulses in the sprinkler line. The device has a valve control unit whose head is designated 3. The unit consists of a cylindrical valve body 4, which is located in a The vertical wall 5 is arranged in the sprinkler housing 6. The vertical wall 5 divides the sprinkler housing 6 into an inlet chamber 7 and a Outlet chamber B. The valve body 4 is provided on one side with a stem that penetrates a seal in the housing wall and on the other side. This one has a collar io. A compression spring ii is clamped between the collar io and the valve housing wall in such a way that it tends to the The valve body 4 is guided in the closing direction, the closing movement being limited by a flange 12 of the valve body 4. 4 together with the cylindrical piston 13 arranged on its opposite side forms a differential piston, with the bearing for Part 13 of the differential piston is formed by the opening of a channel 15 extending from the inlet chamber 7. The area of ​​the piston 13 is expediently about 80% of the effective area of ​​the valve body, thereby relieving the valve to about 80% and making the compression spring ii smaller can be dimensioned more precisely than would otherwise be required. The compression spring ii is intended to actuate the valve body with a force that is less than the force where the valve body is affected by the full water pressure in chamber 7, which is greater than the force, where the valve body 4 is affected by the impulsively reduced water pressure.

[0010] As can be seen from the illustration, the valve body 4 can move a small amount in the opening direction without open. The movable valve body 4 of each sprinkler should be kept locked in the closed position and only then released and Allow the valve to open when the sprinkler in question is scheduled to release water. This is achieved by the following: Valve actuation device reached.

[0011] A ratchet wheel 17 is rotatable in the housing 16 of the device, which is attached to the valve housing 6 and into which the shaft 9 projects. arranged, with as many teeth as there are sprinklers, in this case, for example, six teeth. One of these teeth, 18, projects further beyond the circumference of the ratchet wheel than the others. Near the ratchet wheel, an angle lever is positioned as shown. i9 is mounted, which is pivotable in the plane of the ratchet wheel 17. The lever i9 has an upwardly directed arm 20, which is held in position by spring force or The weight of the other arm 21, which extends downwards from the valve, presses it against the circumference of the ratchet wheel 17. The arm 21 serves as Locking element for the valve body 4, wherein the stem 9 of the latter is provided at its outer end with a head 22 which is connected to the free end of arm 21 interacts and prevents the opening movement of the valve body when full working pressure prevails in chamber 7 and the Arm 20 is located opposite one of the shorter teeth of the wheel 17. The longer tooth 18 serves as an actuating element for the angle lever i9 and pivots it into such a position that the head 22 can pass freely under the locking arm 21, so that the valve is opened. This happens at every sixth step of the rotational movement of wheel 17, the rotational movement being brought about in the following manner: The feed pawl The pawl 23 of the ratchet wheel 17 is equipped with a return spring 24 and together with it forms a spring-loaded ratchet. The pawl 23 is engaged by the The outer end of the valve stem 9 is actuated each time the pressure acting on the valve in chamber 7 during the impulse reaches a certain level. a lower value is reached than the tension of the compression spring ii. The pawl 23, which is pivoted by the valve stem, rotates the ratchet wheel by one The step is further adjusted according to i / iz revolutions, where n denotes the number of sprinklers in the system. The actuating elements 18 of the individual sprinklers They are rotated one step relative to each other so that the sprinklers are switched on and off in a periodic sequence.

[0012] A system with six rotary sprinklers operates as follows: It is assumed that the time release device is set such that it It gives a pulse every half hour. When the pump is running, the operating mechanism 18 of one of the sprinklers is located opposite the Arm 20, while the operating mechanisms of the other sprinklers are each in a different position. The valve of the first-mentioned sprinkler It therefore opens as soon as the water pressure exceeds the spring pressure, whereas in the other sprinklers the valve body rotates by a small amount. The amount shifts in the opening direction without opening, because the head 22 cannot pass the downward-swiveled locking element 2r. After 112 hours, the timer in line i generates a pulse-like pressure reduction, whereby the valve of the first sprinkler 3 is closed by the compression spring, which causes the locking wheel 17 to be turned one step further in this and the other sprinklers. When the pressure rises back to full operating value, the valve of the first sprinkler is closed, while the actuating device 18 one of the remaining sprinklers comes to lie opposite arm 20, causing the valve of this sprinkler to be opened by the water pressure. The process is repeated every half hour, with periodic replacement of the water-dispensing sprinkler.

[0013] The device has the advantage that the irrigation periods of each sprinkler can be chosen to be arbitrarily short, because the sprinklers to replace each other periodically over any length of time, thereby causing the amount of precipitation to be released more slowly and evenly. The water is distributed more evenly than during periods of, for example, two hours. It is also possible to use sprinklers with a valve and valve actuation device as to execute a uniform construction that can be connected to the pipe stubs 2 of line i in the usual manner.

[0014] A rain gauge can be assigned to the system and connected to the timer device or the pump drive in such a way that the Irrigation is switched off after a certain amount of rainfall has occurred.

[0015] As indicated above, the invention is not limited to the embodiment shown and described, but it can be applied in The invention can be modified in various ways.

Claims

CLAIMS: i. Rotary jet sprinkler having a valve actuator under the action of a timer intermittent water delivery, which is triggered by impulses, e.g. B. Pressure reductions in the sprinkler line is actuated and with each pulse by means of the Dead travel of a differential piston a blocking device of the full valve lift so often switches on until it full valve lift for a pulse releases, characterized in that the shaft (9) of the differential piston (4, i3) in the sprinkler housing (6) is under the action of a compression spring (ii), the voltage of which is greater than the impulse pressure but less than the operating pressure in the sprinkler line (i), and that the head (22) of the stem (9) a spring-loaded ratchet (23, 24) is actuated, which controls the locking lever (i9) for limiting the valve lift via the ratchet wheel (i7, 18).

2. Rotary jet sprinkler according to Claim 1, characterized in that the sprinkler housing (6) leads through a vertical wall (5) into an outlet chamber (8). and an inlet chamber (7) is divided, from which a channel (i5) starts, the mouth of which contains the bearing (i4) of the part (i3) of the differential piston (4, 13) forms.

3. rotary jet sprinkler according to claim i and 2, characterized in that it is connected to a sprinkler line, the pump motor is a star-delta-connected three-phase motor, which by means of a time-triggering device for generating the pressure pulse at short notice from the Delta connection is switched to the star connection.

4. rotary jet sprinkler according to claim 3, characterized in that the sprinkler system a rain gauge is associated and connected to the timer or the pump drive in such a way that irrigation is switched off becomes after a certain amount of precipitation has been rained down. References cited: German Patent Specification No. 734,747; UNITED STATES.- Patent Nos. 1,258,013, 1,790,0i3.