Pulsed sprinkler unit

FIELD: mechanized irrigation of farm crops by sprinkling process, in particular, equipment used in sprinkling irrigation systems.

SUBSTANCE: pulsed sprinkler unit has valve with seat and piston. Cavity between seat and piston is communicating with nozzle cavity and cavity formed under valve is communicating with air-and-water tank and pressure pipeline. Locking device is equipped with auxiliary piston spring-loaded relative to valve piston and provided with large-sized and small-sized cylinders and divided by means of perforated partition. Auxiliary piston is positioned for axial displacement within casing cylinder and abuts with small-sized cylinder end against seat. Valve and piston are positioned within cavities of small-sized and large-sized cylinders of auxiliary piston, respectively. Distance between partition of small-sized cylinder and valve is greater than distance between right-hand ends of valve piston and auxiliary piston. Outer diameter of small-sized cylinder is smaller than inner diameter of large-sized cylinder of auxiliary piston.

EFFECT: enhanced reliability in operation, reduced consumption of power owing to providing of working capacity within wide range of flow rates and pressures and due to eliminating influence of frictional force of sealing means upon working capacity of locking device in its opening phase.

3 cl, 2 dwg

 

The present invention relates to mechanization irrigation of agricultural crops method of irrigation and can be used for sprinkler irrigation systems.

Known impulse sprinkler apparatus comprising a barrel with a nozzle, a rotation mechanism, a stop valve, made in the form dvuhsezonnogo valve with hydraulic actuator, an air tank with a dividing elastic membrane, with a stop valve mounted in the trunk of a sprinkling apparatus in front of the nozzle so that the cavity between the saddles of valves in communication with the air tank, the cavity of the seat and the piston of the hydraulic actuator is in communication with the pressure pipe, and the hydraulic shut-off organ is loaded by the force of the compressed spring [1].

The disadvantage of this impulse sprinkler apparatus is the low reliability of the self-oscillating mode and a narrow range of variation of the input flow and pressure of water.

The closest technical solution (prototype) is a pulse sprinkler apparatus comprising a nozzle, a water tank and shut-off body, made in the form of housing, cylinder and mounted on the stem of the plunger valve, with a stop valve provided with a spring-loaded relative to the housing by a piston mounted on the rod between the plunger and the valve can be moved; the stem is made with longitudinal and grooves, as the cylinder speed [2].

The disadvantage of this impulse sprinkler system is functioning in a narrow range of change of the input flow and pressure of water and the low reliability of the locking member. The operation of the locking member in the opening phase depends on the friction of the seal, which changes over time due to wear and therefore upsets the operation parameters of the sprinkler system. Below a certain input flow stop valve is not opened, because the flow of water after a slight movement of the valve to the right of the water tank is discharged into the atmosphere through the barrel and sprinkler nozzle of the apparatus without increasing the pressure on the plunger of the valve on the left side needed to overcome the efforts of the compressed spring and move the valve to its rightmost position (the position of the valve opening). The applied flow is aligned with the flow, pour out from the sprinkler, there is a "hang" of the locking member and the termination of the shots. In some sizes of the locking member and the nozzle of the sprinkler apparatus input consumption "hang" reaches the optimum input flow, which leads to an increase of the input flow rate to ensure the health, resulting in increased capital expenditures and reduced efficiency of the impulse sprinkler system.

The aim of the invention is to increase reliability and reduce energy consumption by providing the functionality in a large range of changes of the input flow and pressure and to prevent the friction of the seals on the performance of the locking member in the phase of its opening.

This objective is achieved in that the cavity between the seat and the piston valve is in communication with the cavity of the barrel and the cavity under the valve with air tank and pressure pipe, a stop valve provided with a spring-loaded relative to the piston valve auxiliary piston with large and small cylinders separated by a partition with holes, while the auxiliary piston mounted in the cylinder housing with the possibility of axial movement and is pressed against the seat by the end of the small cylinder, and the valve and piston are mounted respectively in the cavities of small and large cylinders of the auxiliary piston, and the distance from the wall of the small cylinder to the valve is made larger than the distance between the right ends of piston and auxiliary piston, and the outer diameter of the small cylinder is made smaller than the inner diameter of the large cylinder of the auxiliary piston.

The essence of the invention shown in figure 1 - General view of the impulse sprinkler system, and 2 - welco is Amy stop valve impulse sprinkler apparatus in longitudinal section.

Impulse sprinkler apparatus consists of a water tank 1 with the separating elastic membrane 2, the restrictive code of 3 and a device for filling air 4, input 5 and output 6 fittings, dodobrango device 7 and the locking member 8. Water tank 1 flexible membrane 2 is divided into water 9 and 10 air cavity. The locking body 8 is installed on the fitting 6 and includes a housing 11 with an inlet 12 and an output 13 of the cavity, a stepped cylinder 14 with the base 15 and the side output channels 16, valve 17 with the rod 18 and the piston 19, the springs 20 and 21, the auxiliary piston 22 with a large 23 and 24 small cylinders and the base 25 with the holes 26, the cover 27 with an adjusting bolt 28 and the thrust washer 29. The base 15 has a seat 30 and 31, and the small cylinder 24 is a drain hole 32 in the side wall. The auxiliary piston 22 and the piston valve 19 provided with sealing sleeves 33 and 34 and form a cavity 35 and 36. The cavity 36 is communicated with the atmosphere through the opening 37.

In the initial position, the valve 17 is pressed against the valve seat 30 by a spring 21, an adjustable bolt 28 and thrust washer 29, the piston 19 and piston rod 18, and the small cylinder 24 to the seat 31 by means of a spring 20.

For normal operation of the pulse sprinkler apparatus must be filled with air cavity 10 through the device 4 to the minimum operating pressure Pminand the observance of the Sabbath. ü the following conditions (without taking into account the friction forces between the parts due to its small size):

where

d22- the diameter of the auxiliary piston 22,

d19the diameter of the piston 19,

d24- outer diameter of the small cylinder 24,

d17- the effective diameter of the valve 17,

S17- the effective area of the valve 17,

S19- the cross-sectional area of the piston 19,

S22- ring area of the auxiliary piston 22,

L19-22- the distance between the right ends of the piston 19 and 22,

L19-23- the distance from the left end of the piston 19 to clamp at the base of the large cylinder 23,

L19-27- the distance from the right end of the piston 19 to the cover 27,

L17-25- distance-right edge of the valve 17 to the walls 25,

To20the stiffness coefficient of the spring 20,

To21the stiffness coefficient of the spring 21,

f20- the pre-compression force of the spring 20,

f21- the pre-compression force of the spring 21,

PNETWORK- the water pressure in the supply network,

Pmin- minimum working pressure in the cavity 10,

Pmax- pressure at the beginning of the opening of the locking body 8 (the moment of separation of the valve 17 from the seat 30),

qenvironments - the average input rate to the sprinkler apparatus,

q5- the water flow coming from the network into the water tank 1 at the opening of the locking member 8,

q30- the flow of water from the cavity 35 in the cavity 13 in the opening of the locking member 8,

Q - rate shot pulse sprinkler system.

Works impulse sprinkler apparatus as follows:

Water under pressure PNETWORKfrom the network by the fitting 5 is flow qenvironmentsin the water chamber 9 water tank 1, compressing the pre-inflated air in the air cavity 10 and moving down the separation membrane 2 as a stop valve 8 mounted on the nozzle 6, is closed to the pressure of the water cavity 9 values of Rmax(condition 3). Restrictive code 3 limits the amount of accumulation of water in the water tank and protects the separation membrane 2 from the destructive strains in case of leakage of air from the cavity 10.

When the pressure in the cavity 9 to Pmax(accumulation period) stop valve 8 is opened and the accumulated volume of water in the cavity 9 under the action of compressed air in the cavity 10 through the separation membranes 2 large flow Q is thrown on the irrigated field in the form of rain through gorgeopuus device 7 (the period of release). After release of the accumulated displacement of the locking body 8 C is kryvaetsja and then the cycle "collection-release" is automatically repeated. The duration of the accumulation period can be 2 orders of magnitude greater than the duration of the period of release. The frequency of cycles "accumulation-release" is controlled by varying the applied flow.

The locking body 8, which provides cycle "collection-release of" impulse sprinkler apparatus operates as follows.

To the pressure in the cavity 12 of the housing 11 to Rmax(accumulation period), which corresponds to the accumulated volume of water in the cavity 9 of the water tank 1, the valve 17 under the action of springs 21 and 20 prevents the message cavities 9 and 12 with cavities 35 and 13 through the flow area of the seat 30 of the base 15 (condition 3). When the pressure in the cavity 11 to Rmax(the beginning of the opening of the shut-off organ), the force on the valve 17 on the left side exceeds the spring force 20-21, and he breaks away from the saddle 30 and reports the cavity 12 with the cavity 35 through the openings 26 in the partition 25. Thanks to the conditions (1) and (7) small cylinder 24 is pressed against the seal 31 and the pressure in the cavity 35 is changed incrementally, so that the force from the piston 19 against the spring 21 increases dramatically. The piston 19 is suddenly moved to the right in the cover 27 with a hole 37, moving behind the auxiliary piston 22 with a large 23 and 24 small pistons, pushing the valve 17 in the partition 25. Cavity 9, 12 through the cavity 25 through the channel 16 to report the I with the cavity 13 and then through gorgeopuus device with the atmosphere (the end of the opening of the shut-off organ). Due to condition (5) auxiliary piston 22 with a large 23 and 24 small cylinders and the piston 19 with the rod 18 and the valve 17 will remain in the far right position until the full release of the accumulated water volume of the cavity 9 to irrigated field in the form of rain through gorgeopuus device 7.

After release of the accumulated volume of water through the condition (6) valve 17 under the action of the spring 21 is moved to the leftmost position (the beginning of the closing of the shut-off organ), closing the throttle cross section of the seat 30, and only after that the small cylinder 24 with a delay of L19-23from the valve 17 is pressed against the seal 31 under the action of the spring 20 and divides the cavity 35 of the cavity 13, squeezing excess water from the cavity 35 into the cavity 13 through the drainage holes 30 (the end of the closing of the shut-off organ).

Thus, the locking body 8 is returned to its original (closed) position. The process of "accumulation-release" is repeated in a cyclic mode.

The sealing lip 33 and 34 to prevent leakage of water from the cavity 35 and 13 into the atmosphere. Due to condition (2) are excluded overload valve 17 (on its retaining nut) at the time of emission of the accumulated volume of water.

Thus, by message cavity between the seat and the piston valve with the cavity of the barrel and the cavity under the valve with air tank and pressure is truboprovodov, supply stop valve 8 auxiliary piston 22 with a large 23 and 24 small cylinders, perform the d19>d24and L25-17>L19-22achieved performance in a large range of changes of the input flow rate (condition 7), provided with a clear opening and closing of the locking body 8 and excluded the influence of the friction of the sealing collars 33 and 34 on the reliability of the locking member.

Experimental samples impulse sprinkler apparatus of the prototype and the present invention is made in production workshops, Federal research Institute "rainbow", and comparative tests were performed in laboratory conditions. The test results are shown in the table.

Table

№ p/pName of indicatorThe present inventionThe placeholder
1.The valve housing authorityCase 2 iron gatesimilarly, the
2.The volume of the air tank40 l40 l
3.Pressure pre-inflated air (Pmin)0,15 0,30...MPa0,15 0,30...MPa
4.Pressure since the opening of the shut-off body (Rmax) 0,25 0,50...MPa0,25 0,50...MPa
5.Pressure supply network0,30...0,55 MPa0,50 0,75...MPa
6.The range of changes in input consumption0,05...to 0.50 l/s0,20 0,3...5 l/s
7.Unproductive volume discharge of water through the nozzle dodobrango device before opening the shut-off organ0,025 0,05...l1,50...0,80 l

The use of the invention in the national economy will significantly improve the reliability and efficiency of irrigation systems by way of sprinkling.

Sources of information

1. USSR author's certificate No. 1090294, CL 01G25/00.

2. USSR author's certificate No. 1128878, CL 01G25/09.

1. Impulse sprinkler apparatus, comprising a water-tank with the separation membrane, gorgeopuus device with the barrel and the lock body is made in the body with a saddle, cylinder and spring with the valve stem and the piston, characterized in that the cavity between the seat and the piston valve is in communication with the cavity of the barrel and the cavity under the valve with vodovody tank and pressure pipe, a stop valve provided with a spring-loaded relative to the piston valve auxiliary piston with large and small cylinders separated by perehara is coy with holes, when this auxiliary piston mounted in the cylinder housing with the possibility of axial movement and is pressed against the seat by the end of the small cylinder, and the valve and piston are mounted respectively in the cavities of small and large cylinders of the auxiliary piston.

2. Impulse sprinkler apparatus according to claim 1, characterized in that the distance from the wall of the small cylinder to the valve is made larger than the distance between the right ends of the piston and the auxiliary piston.

3. Impulse sprinkler apparatus according to claim 1, characterized in that the outer diameter of the small cylinder is made smaller than the inner diameter of the large cylinder of the auxiliary piston.



 

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4 dwg

FIELD: agricultural engineering.

SUBSTANCE: invention relates to machines for mechanization of drop sparkling of farm crop. Proposed truss includes central panel in form of regular pyramid with square base made of pipes with flanges for connecting bottom chords and four suspensions. Suspensions are orientated along ribs of pyramid and one post. Post is arranged in central panel on one of side faces along apothem. Left-hand and right-hand cantilevers are mated with central panel. Each cantilever consists of one end panel and thirteen intermediate panels. Each intermediate panel is made in form of two posts, one distance piece, front and rear water passing pipes of bottom chords, one upper chord, two inclined braces, two horizontal tension members and two short-range sprinkler heads. End panel is made in form of guy truss. End panel is mated with truss panel by means of distance piece and inclined braces whose mated ends are orientated downwards in cross vertical plane of truss and are located lower than distance piece. Ends of front and rear water passing pipes are connected with guy truss pipeline by V-shaped water passing member. Panels of guy truss are formed by posts and distance pieces, inclined braces and tension members vertically orientated in longitudinal vertical plane. Water passing pipeline of guy part of truss is furnished with drain cock. V-shaped water passing member consists of steel pipes of equal section equal to sections of front rear water passing pipes and pipe line of guy truss. One of pipes of V-shaped water passing member is sectional and provided with threaded sleeve. Sleeve is fitted on threaded bushings. Bushings are installed with displacement outwards from ends of pipes. Bushings are connected by closed girth welds with end sections of parts of pipes to be connected. Insert made of plastic, for instance, fluoroplastic, is mounted between end faces of sectional parts of pipes and in plane of threaded bushings. Inner section of insert is equal to sections of pipes of V-shaped water passing member. Proposed two-cantilever self-aligning truss for sprinkling machines provides uninterrupted delivery of sprinkling water to short range heads of intermediate panels and long-range heads on guy part of truss.

EFFECT: reduced materials usage, improved sprinkling.

9 dwg

FIELD: agricultural engineering.

SUBSTANCE: invention relates to machines for mechanization of drop irrigation of crops. Proposed truss has upper and lower chords, central panel in form of regular pyramid with square base and left-hand and right-hand cantilevers mated with pyramid. Central panel has square base made of tubes with flanges for connecting lower chords and four suspensions orientated along ribs. Panel is provided with one post located on one of side faces along apothem of pyramid. Each cantilever consists of thirteen intermediate panel and one end panel. Each end panel is made up of two posts, one brace, two front and rear water tubes of lower chords, one upper chord, two tilted struts and two horizontal tension members. Two heads are fitted on each intermediate panel and end panel. End is made in form of guy-rope truss. It is mated with truss panel by brace and tilted posts. Ends of tilted posts are relative mated from top and bottom by horizontally orientated brace. Mated ends of tilted posts are orientated downwards and arranged lower than brace. Ends of front and rear water tubes in guy-rope part are relative mated by V-shaped water supply member with tube of truss guy-rope part. Panels of guy-rope part of truss are formed by posts and braces, tilted struts and tension members orientated in longitudinally vertical plane. water supply pipeline of guy0rope part is furnished with drain valve. Proposed truss provides 15-20% reduction of materials usage.

EFFECT: improved quality of sprinkling, facilitated servicing.

7 cl, 1 tbl, 53 dwg

FIELD: agricultural engineering, in particular, irrigation equipment, more particular, continuous motion sprinkler machines for farms.

SUBSTANCE: girder has central panel with two cantilevers pivotally fixed thereon. Each of two cantilevers is made in the form of mutually perpendicular vertical and horizontal girders having belts, columns, angle braces and sprinkler heads on water supply girder. Pipelines on central panel and water supply girder are made in the form of curved circuit line in transverse-vertical plane of sprinkler unit. Circuit line equation is y=a/2(ex/a+e-x/a), where a is distance from surface of field to be irrigated to pipeline arranged in mid portion of central panel; e is Napierian base (Napierian number); x and y are abscissae and ordinates of unknown points of pipeline in Cartesian coordinates XOY, the beginning part of which is aligned with field surface and with vertical axis of symmetry of girdle.

EFFECT: enhanced reliability in operation and increased efficiency.

4 dwg

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