Patent Application
20240001389
The present invention relates to an improved amplitude-modulating assembly for a pneumatic spray gun.
A pneumatic spray gun is a spraying device powered by compressed air. Compressed air is supplied from the air inlet tube into the gun body. When the high-pressure compressed air is ejected from the air cap on the front portion of the spray gun, a zone of negative pressure lower than the atmosphere pressure is created in front of the paint nozzle. Due to the pressure difference in front of the muzzle, the paint is sucked out from the paint storage tank and is atomized into tiny particles by the high-speed ejected compressed air, thus being coated on the surface to be painted. The technology of pneumatic spray guns is already quite mature. However, manufacturers are still making effort in further improvements in terms of optimized structure, better performance, longer life cycle, lower production cost, simplified assembly etc., with a view to maintaining their competitive edge in the market.
In the conventional pneumatic spray gun, the amplitude-modulating assembly is usually configured inside the amplitude-modulating passage of the gun body. The amplitude-modulating rod moves axially to adjust the opening of the air passage. The spray range of the air cap can be adjusted gradually from sector shape to round shape. Researchers have found that, when the air flow passes the free end of the amplitude-modulating rod and the inner wall of the amplitude-modulating passage, the air flow becomes partially disordered and inhibited.
in view of the deficiencies in the above problems, the present invention provides an improved amplitude-modulating assembly for pneumatic spray gun.
In order to achieve the above object, the present invention provides an improved amplitude-modulating assembly for a pneumatic spray gun, wherein the amplitude-modulating assembly is arranged in an amplitude-modulating passage of a gun body, and comprises an amplitude-modulating screw seat fixedly connected with the gun body, an amplitude-modulating rod inserted into the amplitude-modulating screw seat and screwed to the amplitude-modulating screw seat through threads, an amplitude-modulating seal ring disposed between the amplitude-modulating rod and the amplitude-modulating screw seat, a clamping check ring disposed in a middle portion of the amplitude-modulating rod and used to limit the position of the amplitude-modulating rod, wherein an inner end of the amplitude-modulating rod is an amplitude-modulating portion, the amplitude-modulating portion is formed with a first inclined surface and a second inclined surface which are inclined toward an axis line.
More particularly, wherein an outer end of the amplitude-modulating rod is fixed with an amplitude-modulating cap through a screw, the amplitude-modulating screw seat has a shoulder to interact with the amplitude-modulating cap, the shoulder is used to limit the position of the amplitude-modulating rod.
More particularly, wherein the included angle between the first inclined surface and the axis of the amplitude-modulating rod is 15 degrees, and the included angle between the second inclined surface and the axis of the amplitude-modulating rod is 53.75 degrees.
More particularly, wherein the amplitude-modulating screw seat is in threaded connection with the gun body and is sealed, the outer end of the amplitude-modulating screw seat is configured with a hex head, and the hex head is hidden inside the amplitude-modulating cap.
Comparing to the prior art, the present invention has the following benefits: The structure of the amplitude-modulating assembly is improved to allow two or more than two angle gradients for the amplitude-modulating portion, resulting in more smooth air flow when it works inside the amplitude-modulating passage of the gun body, so as to reduce fluctuation and create uniform atomized particles. The existing amplitude-modulating screw seat usually has a hex head configured in the middle, whereas in the present invention, the hex head is configured at the outer end of the amplitude-modulating screw seat and is covered by the amplitude-modulating cap, contributing to better appearance of the product.
Depicted in
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.
The usage of the present invention is detailed as below:
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.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202221642920.X | Jun 2022 | CN | national |
