Spraying apparatus having helical groove

A spraying apparatus, used for connecting a high-pressure liquid supply device and thus receiving a high-pressure liquid delivered by a high-pressure pipe of the high-pressure liquid supply device, comprising:

• a container, used for accommodating a detergent, having an accommodation space;
• a delivery pipe, disposed in the container, extending into the detergent, having a delivery channel;
• a liquid-mixing fitting, having a mixing channel connected with the high-pressure pipe and the delivery channel, further connected to the accommodation space via the delivery channel, used for inhaling the detergent from the accommodation space and then conveying to the mixing channel via the delivery channel upon when the high-pressure liquid flows through the mixing channel, so as to mix the detergent and the high-pressure liquid into a detergent mixture;
• a pressurized fitting, disposed downstream to the delivery pipe and having an inner wall for defining thereinside a pressurizing channel connected coaxially with the mixing channel, the inner wall having a leading tapered section, a middle straight section and a tailing nozzle section orderly arranged in a pressuring direction, the leading tapered section being furnished with at least one helical groove for pressurizing the detergent mixture to form a pressurized detergent mixture;
• and
• a foam-generating element, connected with the pressurized fitting, used for forming a plurality of cleaning foams upon when the pressurized detergent mixture flows by.