Patent ID: 8336789

Claim:
A spraying device, which comprises a sprayer comprising: a control handle, which forms one or a plurality of air inlet openings and one or a plurality of air outlet openings; a first hollow barrel, which has an end forming a first coupling end connectable with the air outlet opening of the control handle and another end forming a second coupling end, the first hollow barrel receiving and retaining therein a block, which forms an internal passage and is located between the first coupling end and the second coupling end, the block having an outside surface forming one or a plurality of air passageways communicating between the first coupling end and the second coupling end, the internal passage of the block having an end forming a first end port that faces outward of the first hollow barrel and another end of the passage opposing the second coupling end and forming a second end port, a coupling portion extending outward from an opening of the second coupling end and having a surface forming one or a plurality of grooves in communication with the second coupling end; a second hollow barrel, which has an end that is an open end and an opposite end forming a coupling end connectable to the coupling portion of the first hollow barrel, the second hollow barrel forming therein an accommodation chamber and also forming a first channel in an upper wall of the accommodation chamber and a second channel in a lower wall of the accommodation chamber; a driving unit, which is received in the accommodation chamber of the second hollow barrel and has two ends which extend outward to form a shaft, a bore formed in the shaft and extending through the driving unit, a sleeve being fit outside the driving unit and forming first air apertures corresponding in position to the first channel of the second hollow barrel and second air apertures corresponding in position to the second channel of the second hollow barrel, positioning seats being respectively fit over opposite end portions of the shaft and tightly positioned against the sleeve, each of the positioning seats receiving and retaining therein a bearing through which the shaft extends and is thus supported; a spraying tube, which is arranged inside the second hollow barrel and has an end forming a fitting portion connectable with the shaft of the driving unit; and a liquid ejection tube, which has an end extending through and received in the bore of the driving unit and the spraying tube and an opposite end forming a retention seat connectable to the second end port inside the first hollow barrel.