Abstract: A spray device comprises a diaphragm pump, a spray gun and a hose. The diaphragm pump comprises an air outlet to supply air flow, a casing and a pump assembly disposed in the casing. The spray gun comprises a housing and a Venturi tube arranged entirely inside the housing. The housing has an air inlet to receive the air flow supplied from the diaphragm pump and guide the air flow into the Venturi tube. The spray gun comprises 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. The hose has two ends respectively coupled to the air outlet of the diaphragm pump and the air inlet of the spray gun.

Abstract: A spray device comprises a diaphragm pump, a spray gun and a hose. The diaphragm pump comprises an air outlet to supply air flow, a casing and a pump assembly disposed in the casing. The spray gun comprises a housing and a Venturi tube arranged entirely inside the housing. The housing has an air inlet to receive the air flow supplied from the diaphragm pump and guide the air flow into the Venturi tube. The spray gun comprises 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. The hose has two ends respectively coupled to the air outlet of the diaphragm pump and the air inlet of the spray gun.

Abstract: A spray device includes a diaphragm pump that is operated to generate an air flow of 200-250 L/min at a low pressure of 2-3 psi. A spray gun receives the air flow from the diaphragm pump and includes a Venturi tube structure through which the air flow moves. A paint receptacle that receives and holds therein a paint material is connected to the spray gun to allow the paint material to get into the Venturi tube structure to be converted into paint droplets entraining the air flow. A hose has a diameter of 1.5 cm is connected between the diaphragm pump and the spray gun to conduct the air flow from the diaphragm pump to the spray gun so that the paint droplets can be sprayed out to a workpiece with the low pressure of 2-3 psi without causing significant rebounding from the workpiece.

Abstract: The present invention relates to an environmentally low-power & low-pressured spray apparatus, comprising a very low AC power under 400W or portable DC battery, low-pressured electromagnetic diaphragm pump, combined with a large-diameter connection hose, and then in combination with a special low pressure spray gun. In use of a large amount of air produced by the pump, passing through the connecting big diameter hose to the special low pressure spray gun, the paint or coating can fast and efficiently be atomized and coated on walls or other items, wherein losses of the paint material or coating can be much reduced and the air pollution and noise pollution are also much reduced. Meanwhile, the invention can save the consumption and waste of electricity more than 80%, which is then obtained creative and progressive.