AMPLITUDE-MODULATING ASSEMBLY FOR PNEUMATIC SPRAY GUN

Abstract

An improved amplitude-modulating assembly for pneumatic spray guns. The amplitude-modulating assembly is configured inside the amplitude-modulating passage of the gun body, comprising an amplitude-modulating screw seat fixed with the gun body, and an amplitude-modulating rod going through the amplitude-modulating screw seat and in threaded connection with the amplitude-modulating screw seat. An amplitude-modulating seal ring is configured between the amplitude-modulating rod and the amplitude-modulating screw seat. The middle portion of the amplitude-modulating rod is configured with a clamping check ring. The clamping check ring is used to limit the position of the amplitude-modulating rod. The inner end of the amplitude-modulating rod is the amplitude-modulating portion. The amplitude-modulating portion is formed with a first inclined surface and a second inclined surface tilting toward the axis.

Claims

1. An improved amplitude-modulating assembly for a pneumatic spray gun, wherein the amplitude-modulating assembly (2) is arranged in an amplitude-modulating passage (11) of a gun body (1), and comprises an amplitude-modulating screw seat (22) fixedly connected with the gun body (1), an amplitude-modulating rod (23) inserted into the amplitude-modulating screw seat (22) and screwed to the amplitude-modulating screw seat (22) through threads, an amplitude-modulating seal ring (24) disposed between the amplitude-modulating rod (23) and the amplitude-modulating screw seat (22), a clamping check ring (25) disposed in a middle portion of the amplitude-modulating rod (23) and used to limit the position of the amplitude-modulating rod (23), wherein an inner end of the amplitude-modulating rod (23) is an amplitude-modulating portion (23a), the amplitude-modulating portion (23a) is formed with a first inclined surface (231) and a second inclined surface (232) which are inclined toward an axis line.

2. The improved amplitude-modulating component for the pneumatic spray gun defined in claim 1, wherein an outer end of the amplitude-modulating rod (23) is fixed with an amplitude-modulating cap (21) through a screw, the amplitude-modulating screw seat (22) has a shoulder (221) to interact with the amplitude-modulating cap (21), the shoulder (221) is used to limit the position of the amplitude-modulating rod (23).

3. The improved amplitude-modulating component for the pneumatic spray gun defined in claim 2, wherein the included angle between the first inclined surface (231) and the axis of the amplitude-modulating rod (23) is 15 degrees, and the included angle between the second inclined surface (232) and the axis of the amplitude-modulating rod (23) is 53.75 degrees.

4. The improved amplitude-modulating component for the pneumatic spray gun defined in claim 3, wherein the amplitude-modulating screw seat (22) is in threaded connection with the gun body (1) and is sealed, the outer end of the amplitude-modulating screw seat (22) is configured with a hex head (22), and the hex head (22) is hidden inside the amplitude-modulating cap (21).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0010] FIG. 1 is a perspective view of a pneumatic spray gun configured with an amplitude-modulating assembly according to the present invention;

[0011] FIG. 2 is a sectional view of FIG. 1;

[0012] FIG. 3 is an enlarged view of the amplitude-modulating assembly in FIG. 2;

[0013] FIG. 4 is a perspective view of the amplitude-modulating assembly according to the present invention;

[0014] FIG. 5 is an exploded view of the amplitude-modulating assembly according to the present invention.

DETAILED DESCRIPTION OF THE INVENTION

[0015] Depicted in FIGS. 1-5 is an amplitude-modulating assembly for pneumatic spray guns. The amplitude-modulating assembly 2 is configured inside the amplitude-modulating passage 11 of the gun body 1, comprising an amplitude-modulating screw seat 22 fixed with the gun body 1, an amplitude-modulating rod 23 going through the amplitude-modulating screw seat 22 and in threaded connection with the amplitude-modulating screw seat 22. An amplitude-modulating seal ring 24 is configured between the amplitude-modulating rod 23 and the amplitude-modulating screw seat 22. The middle portion of the amplitude-modulating rod 23 is configured with a clamping check ring 25. The clamping check ring 25 is used to limit the position of the amplitude-modulating rod 23. The inner end of the amplitude-modulating rod 23 is an amplitude-modulating portion 23a. The amplitude-modulating portion 23a is formed with a first inclined surface 231 and a second inclined surface 232 tilting toward the axis. The outer end of the amplitude-modulating rod 23 is fixed with an amplitude-modulating cap 21 through a screw. The amplitude-modulating screw seat 22 has a shoulder 221 that interacts with the amplitude-modulating cap 21. The shoulder 221 is used to limit the position of the amplitude-modulating rod 23. Through the amplitude-modulating cap, the amplitude-modulating rod can be easily rotated. When working with the shoulder, the amplitude-modulating cap also offers the positioning function. The included angle between the first inclined surface 23 land the axis of the amplitude-modulating rod 23 is 15 degrees, whereas the included angle between the second inclined surface 232 and the axis of the amplitude-modulating rod 23 is 53.75 degrees. The first inclined surface adopts a small inclination angle, whereas the second inclined surface adopts a large inclination angle. When the air flow passes the position of the amplitude-modulating portion, the sectional area of the air flow is gradually increased and the air flow is gentle with limited fluctuation. The amplitude-modulating screw seat 22 is in threaded connection with the gun body 1 and is sealed. The outer end of the amplitude-modulating screw seat 22 is configured with a hex head 222. The hex head. 222 is hidden inside the amplitude-modulating cap 21. The hex head facilitates the connection between the amplitude-modulating screw seat and the gun body. The design of a hidden hex head can improve the overall appearance of the amplitude-modulating assembly.

[0016] The present invention made a structural improvement to the amplitude-modulating assembly 2. The amplitude-modulating, portion adopts a structure with two or more than two angle gradients. When working with the amplitude-modulating passage of the gun body 1, the air flow becomes more smooth. As a result, the atomization will have less fluctuation and the atomized particles will be more uniform. The existing amplitude-modulating screw seat is usually configured with a hex head in the middle portion, whereas in the present invention, the hex head 222 is configured on the outer end of the amplitude-modulating screw seat 22 and is covered by the amplitude-modulating cap 21 for better appearance.

[0017] The usage of the present invention is detailed as below:

[0018] When the compressed air enters the gun body 1 and reaches the amplitude-modulating passage 11, through the axial movement of the amplitude-modulating rod 23, the spraying range of the air cap can be adjusted. When the high-pressure air passes through the amplitude-modulating portion 23a and the area enclosed by the inner wall of the amplitude-modulating passage 11, the air flow along the first inclined surface 231 and the second inclined surface 232. As the first inclined surface and the second inclined surface are tilted toward the axis of the amplitude-modulating rod 23, the sectional area of the air flow is gradually increased and the air flow becomes more smooth with less fluctuation.