Spray device

A spray device, comprising:

• a diaphragm pump, comprising an air outlet to supply air flow, a casing and a pump assembly disposed in the casing, the casing comprising a receiving room disposed on an upper side of the casing and a top cover covered on the receiving room, a filter being received in the receiving room;
• a gap being formed between the top cover and a periphery wall of the receiving room, a bottom wall of the receiving room having at least one through hole communicated with an interior of the casing, a plurality of fins extending on an outer surface of the casing, the plurality of fins being spaced apart from one another and defining a plurality of channels communicated with an interior of the receiving room, the top cover being saddled on the plurality of fins;
• a spray gun that comprises a housing and a Venturi tube arranged entirely inside the housing, the housing having an air inlet to receive the air flow supplied from the diaphragm pump and guide the air flow into the Venturi tube, the air inlet being communicated with the Venturi tube in the housing, the air inlet extending out of the housing, the spray gun further comprising a paint receptacle that receives and holds therein a paint material that is supplied into the spray gun and atomized to form paint droplets and entrain the air flow received from the diaphragm pump to allow the paint droplets to be sprayed onto a workpiece;
• and
• a hose having two ends respectively coupled to the air outlet of the diaphragm pump and the air inlet of the spray gun for conducting the air flow from the diaphragm pump to the spray gun,
• wherein the bottom wall of the receiving room further has a plurality of ribs, the filter is disposed on the plurality of ribs, the plurality of ribs includes a plurality of first straight ribs, a plurality of second straight ribs and a plurality of arced ribs, the plurality of first straight ribs extend in a direction perpendicular to a direction in which the plurality of second straight ribs extend, and the plurality of arced ribs are located between the plurality of ribs and disposed around the at least one through hole, and
• wherein the spray gun further comprises an air cap and a mounting ring which adjustably assembles the air cap to a front of the spray gun, the air cap includes a central hole and a plurality of perforations disposed around the central hole, the front of the spray gun includes a paint nozzle inserted into the central hole and a plurality of air outlets communicated with the plurality of perforations, the plurality of perforations are smaller than the central hole and the plurality of air outlets.