Foam gun

Abstract

The invention relates a foam gun, which comprises a gun body, a liquid inlet valve, a liquid outlet valve, a liquid outlet channel and a switching device, wherein the switching device can open or close the liquid outlet valve; and the liquid outlet valve comprises a liquid outlet nozzle with an outlet, a valve plug and a reset spring. The foam gun is characterized in that: a head of the valve plug is provided with a shoulder, which is provided with a convex part or a concave part threads; the foam gun also comprises a sealing piece made of plastic, at least part of the plastic sealing ring is connected with the convex part or the concave part or the threads arranged on the head of the valve plug into an integral structure; the end part of the plastic sealing piece is exposed out of the outlet of the liquid outlet nozzle; the leakage and / or curing of a foam caulking agent in the foam gun are / is effectively prevented and avoided; the dangers such as leakage or burning or explosion of the foam caulking agent or gas are effectively prevented and avoided; the wear resistance, airtightness and stability of the sealing piece are improved; the leakage of the foam caulking agent because the sealing piece is worn, loosened, deformed, damaged, fallen off, or corroded by the foam caulking agent or a cleaning agent is effectively avoided; a phenomenon that the channel or the outlet in the foam gun is blocked is effectively prevented and avoided; and a phenomenon of leakage of the foam caulking agent or the gas due to deformation or fracture of the liquid outlet nozzle is effectively avoided. The foam gun has a simple and reasonable structure, greatly improves the foaming quantity and quality of foam caulking agent, saves energy, has safe and cleaning use, prolongs the service life, has low cost, and is suitable for mass production.

Description

technical field [0001] The present invention relates to a foam gun for spraying foam caulk. Background technique [0002] About the anti-seepage installation, caulking or leak repair of doors, windows, walls, coatings, concrete, wood and plastic surfaces in buildings and houses, insulation of air-conditioning installations, leak-proof layers, installation of various pipes, vents And the hole filling of the wire outlet, the switch socket and the installation that require insulation, etc., generally use foam sealants as raw materials, for example: foam sealants can use gas and chemical materials with their own air pressure, such as using Butane gas and polyurethane, etc., expand after spraying to form a foam, and then naturally solidify. When in use, the foam sealant is released through a foaming gun to achieve installation, caulking, leak repair, heat preservation, insulation or bonding, etc. Purpose, the channel of the foam sealant in the foaming gun is generally in a liqui...

AI Technical Summary

Problems solved by technology

Due to the strong viscous force of the foam sealant, the continuous movement or twisting of the valve core during construction can easily pull (stick) the sealing ring in the liquid nozzle, causing the sealing ring to wear or loosen or deform or fall off In addition, during the construction, the valve core moves back and forth continuously, and the head of the valve core is easy to poke the inner side of the sealing ring, which is easy to cause damage to the sealing ring. Therefore, there is still leakage of foam sealant or gas or foam. The filler is solidified, which shortens the service life of the foaming gun

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