Spray gun provided with valve sealing structure

Abstract

The invention discloses a spray gun provided with a valve sealing structure. The spray gun comprises a gun body, wherein a valve ejection rod is arranged in the gun body, a valve sleeve is arranged between the front end of the valve ejection rod and the inner wall of the gun body, the inner wall of the valve sleeve is provided with front and back inner seal ring grooves for accommodating inner seal rings, a space for storing grease is formed between the two inner seal rings arranged in the inner seal ring grooves, the outer wall of the valve sleeve is provided with an outer seal ring groove for accommodating an outer seal ring, and the outer wall of the valve sleeve is also provided with a retainer ring groove for accommodating a retainer ring. The spray gun adopts the valve sleeve made ofa metal material, the valve sleeve machining size is stable, and the influence of environment temperature change on the performance of the valve sleeve is tiny.

Description

technical field [0001] The invention relates to a spray gun, in particular to a spray gun with a valve sealing structure. Background technique [0002] The seal of the valve of the spray gun is sealed by the front and rear ends, and the middle section is controlled by the trigger and spring to control the sliding of the valve mandrel to control the switch of the valve. [0003] In the existing spray gun, the sealing of the front end of the valve is realized by a valve sleeve of non-metallic material which is sleeved on the valve mandrel. Specifically, it is through the interference fit between the outer wall of the valve sleeve and the inner wall of the gun, and the interference fit between the inner wall of the valve sleeve and the valve push rod. There are following defects in this sealing method: [0004] 1. The valve sleeve is completely locked by two bumps, and it is easy to fall off during use; [0005] 2. Due to technical problems in the injection molding process o...

AI Technical Summary

Problems solved by technology

[0004] 1. The valve sleeve is completely locked by two bumps, and it is easy to fall off during use;

[0005] 2. Due to technical problems in the injection molding process of non-metallic material valve sleeves, the size is different during the molding process;

[0006] 3. The valve sleeve of non-metallic material is highly sensitive to temperature after injection molding, and the size is unstable due to thermal expansion and contraction;

[0007] 4. The larger the inner diameter of the valve sleeve will cause the valve sleeve to leak air (leak into the gun body), and the smaller the size will increase the fit interference, which will lead to increased friction, which will not only affect the trigger feel, but will seriously Put the valve straight through;

[0008] 5. The valve sleeve is single-channel sealed. During use, the valve ejector rod is easy to bring paint dirt into the valve sleeve, which increases the friction between the valve ejector rod and the valve sleeve and affects the sealing performance.

Images