Foam gun

Abstract

The invention discloses 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, a valve plug and a reset spring. The foam gun is characterized in that: the head of the valve plug is provided with a sealing piece made of metal; the head of the valve plug and the sealing piece are made into an integral structure; the metal sealing piece which is made into the integral structure with the valve plug is sealed with the liquid outlet nozzle; the valve plug is made of stainless steel, stainless iron or copper, so the leakage or curing of foam caulking agent in the foam gun is effectively prevented and avoided; the leakage or curing of the PU foam in the channel in a gun body caused by abrasion, looseness, deformation, peeling off, corrosion of foam filler or cleaning agent is effectively overcome; and the foam gun greatly improves the foaming quantity and quality of foam caulking agent, saves energy, prolongs the service life, and is suitable for mass production.

Description

technical field [0001] The invention relates to a foaming gun for spraying and foaming a foam caulking agent. 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., foam after spraying to form a foam, and then naturally solidify. When in use, the foam sealant is released through the foam gun to achieve installation, caulking, leak repair, heat preservation, and insulation. Or bonding and other purposes, the channel of the foam sealant in the foaming gu...

AI Technical Summary

Problems solved by technology

[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., foam after spraying to form a foam, and then naturally solidify. When in use, the foam sealant is released through the foam gun to achieve installation, caulking, leak repair, heat preservation, and insulation. Or bonding and other purposes, the channel of the foam sealant in the foaming gun is generally in a liquid state with its own air pressure or higher air pressure. When the liquid nozzle is opened through the switch device in the foaming gun, the foam injected After foaming, the joint agent expands and solidifies and sticks to the required place. Therefore, during the construction process through the foam gun, the sealing performance of the foam gun must be high, especially the liquid out of the foam gun. The sealing stability of the valve is more important. When the liquid inlet valve of the foaming gun is equipped with a filling body with foam caulking agent, if the sealing degree of the liquid outlet valve is not up to the standard or there is a slight leakage, The foam sealant in the foaming gun will solidify or overflow or spray out endlessly at any time, causing the foaming gun to be easily scrapped, and it is difficult to clean without damaging the hands or clothes. can have serious consequences in the eyes

[0003] In the prior art, the valve core and the liquid outlet of the foaming gun are generally directly hard-sealed. Although the foaming (expansion) effect of the sprayed foam sealant is better, there is foam left in the intermittent work or in the channel. The caulking agent is difficult to be sealed due to its high air pressure, that is to say, the normal sealing requirements cannot be met between them, and the foam caulking agent is easy to leak outward, which can easily cause the foam filling in the gun body. The joint agent will solidify and cause the entire channel to be blocked, and even there will be a danger of burning or explosion. In addition, during construction, the liquid nozzle is easy to wear and cause leakage.

[0004] There is also a sealing ring in the liquid outlet. In this structure, generally, a fixing piece can be used to fix a large-area sealing ring. It has been found that when the foam sealant is sprayed from the liquid outlet, the sealing ring and the / or the fixing parts have greatly hindered the flow rate of the foam sealant, reducing the foaming amount and quality of the foam sealant, and increasing the cost; due to the strong viscosity of the foam sealant, the construction When the spool moves back and forth or twists, it is easy to pull (stick) the sealing ring in the liquid outlet; it is easy to cause the sealing ring to wear or loosen or deform or fall off, so there is still leakage of foam sealant Or gas or foam filler is solidified, shortening the service life of the foaming gun

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