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 switch device, wherein the switch device can open and 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 threads or a concave part or a convex part; the foam gun also comprises a sealing ring which is connected with the threads or the concave part or the convex part arranged on the head of the valve plug into an integral structure; the sealing ring connected with the valve plug into a whole is sealed with the liquid outlet nozzle; at least partial aperture of the outlet of the liquid outlet nozzle is between 1.3 and 3.0 millimeters, or an inner hole of the outlet of the liquid outlet nozzle has the section with the maximum horizontal length between 1.3 and 3.5 millimeters so as to effectively prevent and avoid the leakage and / or curing of a foam caulking agent in the foam gun; 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 ring are improved; the leakage of the foam caulking agent because the sealing ring 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 prevented. 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 and has low cost.

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 mixed with polyurethane, etc., expand 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, insulation or bonding. For other purposes, the foam caulking agent (foam filler) in the foaming gun is ge...

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 mixed with polyurethane, etc., expand 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, insulation or bonding. For other purposes, the foam caulking agent (foam filler) 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 sprayed After foaming, the foam sealant solidifies and sticks to the required place. Therefore, during the construction process through the foaming gun, the sealing performance of the foaming gun must be high, especially the liquid out of the foaming 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 or intermittent work or foam caulking agent is left in the channel, if the liquid outlet valve If the sealing degree is not up to the standard or there is a slight leakage, the foam sealant in the foaming gun will solidify at any time or overflow or spray out endlessly, causing the foaming gun to be easily scrapped and sticking to the hand without damage. Difficult to clean on the skin or clothes, moreover, non-destructive spraying on the eyes can have serious consequences

[0003] The valve core and liquid outlet nozzle in the foaming gun of the prior art are generally directly hard-sealed, although the effect of foaming (expansion) of the foamed caulking agent sprayed out is better, but when loading on the After filling or intermittent work or when there is foam caulk left in the channel, it is difficult to be sealed because of its high air pressure, that is to say, the normal or stable sealing requirements cannot be achieved between them, and foam caulking The agent is easy to leak outward, which can easily cause the foam sealant in the gun body to solidify and cause the entire channel to be blocked, and even cause the 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 arranged in the liquid outlet, and a fixing member is used to fix the sealing ring with a large area. It has been found that when the foam caulking agent is sprayed from the liquid outlet, the sealing ring and / or the fixing member will not affect the foam filling. The flow rate of the caulking agent has a great obstacle, which reduces the foaming amount and quality of the foam caulking agent, and increases the cost; due to the strong viscous force of the foam caulking agent, the continuous movement of the valve core during construction or Twisting, it is easy to pull (stick) the sealing ring in the liquid nozzle, causing the sealing ring to wear or loosen or deform or fall off. In addition, the valve core is constantly moving back and forth during construction, and the head of the valve core is easy to poke The inner hole of the sealing ring is set on the liquid nozzle, which causes damage to the key sealing part of the sealing ring. Therefore, there is still leakage of foam caulking agent or gas or the solidification of foam filler, and even combustion or explosion may occur. Dangerous, shortens the service life of the foaming gun

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