Pressure-compensation variable-cross-section special shaped spray head

Abstract

The invention provides a pressure-compensation variable-cross-section special shaped spray head, which consists of four parts, namely a rotary sealing mechanism, a flow passage, a pressure compensation mechanism and a rocker-arm mechanism, wherein a key part is the pressure compensation mechanism; the pressure compensation mechanism is formed by sequentially combining and connecting a special shaped nozzle, a connecting piece, a sealing piece, a water baffle and a spring; and the water baffle is obliquely arranged at a certain angle in the flow passage so as to break down the impact force of water flow into downward component force and forward component force. When the pressure of the water flow increases and the downward component force surpasses the elastic force of the spring, the spring is compressed, the water baffle moves down, and the section of a nozzle exit enlarges. When the pressure of the water flow decreases and the elastic force of the spring surpasses the downward component force, the water baffle is reset upwards under the acting force of the spring, and the section of the nozzle exit reduces. The displacement amount of the water baffle is proportional to the change magnitude of incoming-flow pressure. Aiming at the problem of pressure fluctuation, the spray head realizes pressure compensation by a method of changing the exit section, improves spray uniformity, and has the advantages of simple structure, stabler performance, more uniform spray and the like.

Description

technical field [0001] The invention relates to a fluid machine, which belongs to a water-saving and energy-saving agricultural irrigation equipment, in particular to a special-shaped nozzle with pressure compensation and variable cross-section. Background technique [0002] In the process of agricultural water irrigation, the efficiency of water use is not high, and the waste of water resources is serious, which further aggravates the shortage of agricultural water resources. The utilization coefficient of irrigation water in my country is between 40% and 50%, while the utilization rate of irrigation water in developed countries has reached 70%. -80%. Vigorously developing water-saving irrigation is the fundamental way to solve the shortage of agricultural water in our country, and sprinkler irrigation technology is one of the most efficient water-saving technologies at present. The sprinkler head is one of the key equipment of the sprinkler irrigation system, and its perfo...

AI Technical Summary

Problems solved by technology

In general, when the working pressure is lower than the rated pressure, the uniformity of spraying will decrease

When the pressure drops a lot, it will seriously affect the spraying quality

In agricultural, industrial and other production practices, the water pump unit will be unstable due to changes in power supply voltage, water absorption height, etc., resulting in fluctuations in water supply pressure and greatly reduced sprinkler uniformity.

The currently developed variable-range sprinklers often use the method of changing the working pressure to change the range, but at the same time, it will also lead to a decrease in the uniformity of spraying.

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