The automatic dilution principle of a hose-end sprayer is primarily based on the Venturi Effect and mechanical proportional mixing, allowing for precise dilution without the need for electricity or complex devices.
Here are its core working principles:
1. **Venturi Effect Drives Liquid Suction** When water flows through the narrow passage of the sprayer, its velocity increases. According to Bernoulli's principle, the pressure decreases at this point, creating a local vacuum (negative pressure). This negative pressure draws concentrated liquid from a container through the suction tube, achieving automatic mixing.
2. **Fixed Proportional Dilution Mechanism** - **Proportional Valve/Spray Nozzle Design:** The suction tube's inlet or nozzle features an adjustable valve with a fixed orifice (such as a rotating scale dial) that controls the amount of concentrated liquid suctioned by altering the orifice size. - **Preset Proportions:** For example, ratios like 1:10 or 1:50 indicate the volume ratio of concentrated liquid to water. This ratio is determined by the physical structure of the sprayer (such as the diameter of the suction tube and water pressure), allowing users to select the desired scale.
3. **Mixing and Spraying** Once the concentrated liquid is drawn in, it mixes thoroughly with water in the turbulent flow within the sprayer, creating a diluted solution that is atomized and sprayed out through the nozzle for immediate use (e.g., applying pesticides, fertilizers, or cleaning agents). **Key Advantages:** - **No Electricity/Manual Mixing Required:** Dilution is automatically completed based on water pressure and physical structure. - **Precise Proportions:** The design ensures stability of the dilution ratio through engineering calculations (though actual ratios may be affected by water pressure and the viscosity of the concentrated liquid). - **Ready-to-Use Mixing:** Avoids waste or degradation of pre-mixed solutions.
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