Foam gun

Abstract

The invention discloses a foam gun, which comprises a gun body, a liquid inlet valve, a liquid outlet valve 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: a sealing ring made of plastic is arranged on the valve plug and is sealed with the liquid outlet nozzle; the plastic sealing ring is made of plastic, is melted by a plastic machine and poured into a plastic mould embedded with at least part of the valve plug; at least part of the formed plastic sealing ring is encircled in a concave part arranged on the valve plug to effectively prevent and avoid the leakage and / or curing of foam caulking agent in the foam gun; the danger of the leakage, burning or explosion of the foam caulking agent or gas is effectively prevented and avoided; the abrasion performance, airtightness and stability of the sealing ring are improved; the leakage of the foam caulking agent caused by abrasion, looseness, deformation or peeling off is avoided. and 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 invention relates to a foaming gun for spraying 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, switch socket and related installations that require insulation, etc., generally use foam sealants as raw materials. When in use, the foam sealant is released through the foam gun to achieve installation, caulking, and leakage For the purpose of heat preservation, insulation or bonding, etc., the channel of the foam caulking agent in the foaming gun is generally in a liquid state with air pressure or higher air pressure. When the liquid nozzle is opened through the switch device in the foaming gun, the spray The foamed sealant is cured after foaming and b...

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, switch socket and related installations that require insulation, etc., generally use foam sealants as raw materials. When in use, the foam sealant is released through the foam gun to achieve installation, caulking, and leakage For the purpose of heat preservation, insulation or bonding, etc., the channel of the foam caulking agent in the foaming gun is generally in a liquid state with air pressure or higher air pressure. When the liquid nozzle is opened through the switch device in the foaming gun, the spray The foamed sealant is cured after foaming and bonded to the required place. Therefore, in the process of construction through the foam gun, the sealing performance of the foam gun must be high, especially in the foam gun. The sealing stability of the liquid outlet valve is more important. When the filling body is installed on the liquid inlet valve of the foaming gun, if the sealing degree of the liquid outlet valve does not meet the standard or there is a slight leakage, the foaming gun will The foam sealant will solidify or overflow or spray out endlessly at any time, causing the foam gun to be easily scrapped, and it is difficult to clean if it is not damaged and sticks to the hands or clothes. serious consequence

[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 caulking agent will solidify and cause the entire channel to be blocked, even, there will be a danger of burning or explosion

[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. In addition, due to the strong viscosity of the foam sealant, the The continuous back and forth movement of the spool during construction can easily pull (adhere) the sealing ring and cause the sealing ring to loosen or deform or fall off, and it is also easy to cause the sealing ring to wear. Therefore, there is still the phenomenon of leaking foam sealant, which reduces the occurrence The service life of the bubble gun

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