JPH0824716A - Airless spray gun - Google Patents

Abstract

(57) [Summary] [Construction] An O-ring groove 8 is formed on the tip end surface of the valve body 2, and an O-ring 9 is fitted into the O-ring groove 8 with a part thereof protruding, and the nozzle 10 is attached to the O-ring groove 8. The ring 9 is elastically deformed and pressed against the tip surface of the valve body 2. [Effect] Since the O-ring 9 is used for sealing the nozzle 10 and is fitted into the O-ring groove 8 formed on the tip surface of the valve body 2, the O-ring 9 is detached when the nozzle 10 is attached or detached. The O-ring 9 does not need to be strongly tightened because the O-ring 9 has excellent sealing properties and the nozzle 1
In the attached state, 0 can be freely rotated to adjust the direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airless spray gun in which a high pressure is applied to a liquid paint so that the liquid paint is jetted into air from a small-diameter jet at a high speed to atomize the liquid paint. Airless spray gun with improvements to.

[0002]

2. Description of the Related Art In a conventional airless spray gun, a nozzle is attached to the tip of a valve body screwed to the gun body via a flat ring-shaped gasket, and a retaining nut screwed to the valve body is tightened to form a gasket. The nozzle is elastically deformed to seal between the nozzle and the valve body.

However, in such a structure, if the retaining nut is loosened and the nozzle is removed for the purpose of replacement or cleaning of the nozzle, the gasket will fall off, which is not only troublesome to install and remove. There is a risk that the gasket will be lost, and the nozzle outlet has a long and narrow lip shape because it sprays the paint in a flat pattern, but the retaining nut is used to ensure sealing. Had to be tightened strongly, which made it difficult for the nozzle to rotate, making it difficult to adjust the direction.

[0004]

The problem to be solved by the present invention is that the work of attaching and detaching the nozzle is troublesome, and that the direction of the nozzle is difficult to adjust.

[0005]

As a means for solving the above-mentioned problems, the present invention forms an O-ring groove in the front end surface of a valve body, and projects an O-ring partly into the O-ring groove. The nozzle is elastically deformed in the O-ring and pressed against the tip surface of the valve body.

[0006]

The present invention has the above-mentioned structure, and since the O-ring is used for sealing the nozzle and is fitted in the O-ring groove formed in the tip surface of the valve body, the nozzle can be attached or detached. At this time, there is no risk of the O-ring falling off, and the work will be easy, and since the O-ring has excellent sealing properties, it is not necessary to strongly tighten the retaining nut, and the nozzle can be freely rotated in the mounted state to adjust the direction be able to.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

In the figure, reference numeral 1 denotes a gun main body, a valve main body 2 is screwed to the tip thereof, and a valve rod 4 is inserted into a paint passage 3 formed in the gun main body 1 and the valve main body 2. When the valve body 5 at the tip comes in contact with and separates from the valve seat 6, the valve port 7 is opened and closed. An O-ring groove 8 is formed concentrically with the valve opening 7 on the tip surface of the valve body 2.
An O-ring 9 is fitted with a part of the O-ring 9 protruding from the tip end surface of the valve body 2.

Nozzle holder 11 has nozzle tip 1
The nozzle 2 is fixed to the nozzle tip 12. A lip-shaped jet port 13 is formed at the tip of the nozzle tip 12, and two parallel surfaces 14 for applying a tool are formed at the tip of the nozzle holder 11.

Reference numeral 15 is a retaining nut, and a step portion 16 formed on the inner circumference of the tip end portion is hooked on a step portion 17 formed on the outer circumference of the nozzle holder 11 and screwed to the valve body 2, whereby the nozzle 10 is O-shaped. The ring 9 is elastically compressed and pressed against the tip end surface of the valve body 2 to seal between the nozzle 10 and the valve body 2.

In this embodiment, when the valve rod 4 is retracted, the valve body 5 separates from the valve seat 6 and the valve port 7 opens, so that high-pressure paint is sprayed from the jet port 13 of the nozzle 10 into the air at high speed. Although it is ejected to and atomized, even if the retaining nut 15 is loosened and the nozzle 10 is removed, the O-ring 9 becomes O.
Since it does not fall off from the ring groove 8, the nozzle 10 can be easily attached and detached.

Further, after the nozzle 10 is attached, a tool such as a spanner is applied to the parallel two surfaces 14 and rotated, whereby the direction of the spray port 13 can be arbitrarily adjusted and the direction of the spray pattern of the paint can be changed.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a front view of an embodiment of the present invention.

[Explanation of symbols]

 1: Gun body 2: Valve body 8: O-ring groove 9: O-ring 10: Nozzle 13: Jet port 15: Retaining nut

Claims (1)

[Claims] 1. An airless spray gun in which a valve body is screwed to the tip of a gun body, and a nozzle is pressed against the valve body by a retaining nut screwed to the valve body to be attached to the valve body. An O-ring groove was formed on the surface, and the O-ring was fitted into the O-ring groove with a part of the O-ring protruding, and the nozzle was pressed against the tip surface of the valve body by causing elastic deformation of the O-ring. Airless spray gun that is characterized.