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Application of buried sprinkler irrigation in urban gardens
[ China Agricultural Machinery Industry News ] In the urban green space, the pipeline sprinkler irrigation system is generally used for irrigation. The pipeline sprinkler irrigation system is mainly based on the distribution and distribution network. The irrigation water is transported and distributed to the system through the pipelines distributed in the irrigation area. Each sprinkler is then sprinkled by the sprinkler to the ground. According to the installation method of the sprinkler, the sprinkler irrigation method can be divided into surface sprinkler irrigation and buried sprinkler irrigation.
Considering the ease of maintenance of the green space and sprinkler irrigation system, under normal circumstances, sprinkler experts will recommend the use of buried sprinklers in pipeline sprinkler systems. Since the buried sprinkler is mounted below the ground surface or below the plant trim surface, it is not necessary to be affected by the sprinkler when trimming the lawn or hedge. At the same time, the buried nozzle also enhances the anti-theft and anti-destructive capabilities of the nozzle. If you install a surface-mounted nozzle on the lawn, the trouble can be big: you should avoid the nozzle on the grass every time you trim it, which will increase the difficulty of the operation. Secondly, if someone walks on the lawn, accidentally touch it. Wrestling is definitely inevitable, and it is easy to damage the nozzle; in addition, due to the exposed nozzle, some curious tourists will unscrew the nozzle, causing loss and damage. It can be seen that when selecting green space irrigation equipment, the buried nozzle should be.
According to the structure and spray characteristics, the buried nozzle can be divided into a scattering nozzle (fixed nozzle) rotary nozzle and the like. The scattering type nozzle refers to a nozzle that has no relative movement of components during spraying. During operation, the water flow is fanned from the nozzle to the circumference and spreads to the periphery. The characteristics of this type of nozzle are simple structure, reliable operation, close range and high atomization degree. For example, the 570 series nozzles produced by Toro Company of the United States and the 1800 series nozzles produced by Rain Bird Company have a range of no more than 6 meters. Used for small green spaces or narrow green belts. Usually, the nozzle is hidden under the lawn surface or below the plant trimming surface. When the water is sprinkled, the nozzle core protrudes from the outer casing and can be up to 30 cm long. The general ground cover or hedge will not affect its normal work.
Rotary nozzle refers to a nozzle that rotates around its vertical axis. It is characterized by rotating while spraying. When water is sprayed from the nozzle, it has a concentrated jet shape and a long range. It is a widely used type of nozzle. The driving mechanism and the reversing mechanism are important components of the rotary nozzle. According to the characteristics of the driving mechanism, the rotary nozzle can be divided into three types: a rocker arm type, an impeller type and a reaction type. Rotary spray heads are produced from 0 to 50 meters, but in landscaping, buried rotary nozzles with a range of 0 to 15 meters are widely used. Because a large range means more work pressure is needed to meet larger nozzles, which requires more energy and a more piping system. From a safety and economic point of view, large-range nozzles are not recommended for urban landscaping systems. In general, large buried nozzles are mainly used in professional sports venues, such as golf courses, football fields, etc., with a range of up to 34 meters. For grassland forages and field crops that are not demanding, nozzles with a range of more than 50 meters are sometimes used. However, these types of nozzles are of the rocker type.
The most commonly used buried rotary nozzles in the garden are the US Rain Bird's 5000 series nozzles (range 7 to 12.2 meters) T-BIRD series nozzles (range 6.4 to 13.7 meters) Toro's V-1550 (range 4.6 to 14.7 meters) S -700 (range 6.1 to 15.9 meters) Hunter's PGP, PGM nozzle. The general recommended working pressure of these nozzles is about 3 kg, and there is no special pressure requirement for the water supply pipeline.
Arrangement of Buried Nozzles In general, no matter how excellent the design and processing technology, the nozzles are not guaranteed to have a uniform height of irrigation intensity within the coverage. In many cases, the irrigation intensity is larger in the area closer to the nozzle and smaller in the area farther from the nozzle. How can we ensure the uniformity of irrigation in the same water demand area? After countless practices and technical analysis by manufacturers, the conclusion is that regional superposition is a good solution. Simply put, the irrigation area of ​​the nozzle is reasonably repeated. Experts suggest that in the absence of wind, the spacing between the nozzles is the effective spray radius of the nozzle, which should not exceed 1.2 times the spray radius.