RU2457041C2 - Throwaway cartridge for paint spray gun - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to paint spray gun cartridge. Cartridge 1 comprises tube 2 with its first end provided with feed nozzle 5 with fluid discharge bore. Tube second end is furnished with cap 12 having through channel 16. Inlet 7 of pan connector passes through tube sidewall to allow connection to paint vessel 28 and feed of paint into cartridge 1. Sealing needle may slide in cap channel 16 and has converging end 17 to interact with supply nozzle bore 6. Said needle may displace to allow adjustable paint flow via bore 6 and/or to shut off said flow. Said needle is enveloped by seal 11 extending into cap 12 to snag therein to prevent paint drain via channel 16 in cap 12.

EFFECT: throwaway cartridge.

11 cl, 3 dwg

Description

Technical field

The invention relates to an improved manual spray gun (hereinafter - spray gun), designed specifically for use with cartridges used for applying paint. More specifically, the invention is directed to the creation of a disposable cartridge for a spray gun.

State of the art

Spray guns are widely used in painting, when it is necessary to evenly apply paint on sufficiently large surfaces, for example, on cars when they are painted after the repair is completed after a traffic accident. Typically, the liquid used by the spray guns is located in a reservoir attached to the spray gun, from which fluid is supplied to the spray nozzle. In the spray nozzle, compressed air atomizes the liquid, which is then applied to the surface to be painted. The fluid may be supplied by gravity, suction, or pressure generated by air entering the spray gun through an air hose from the compressed air supply line. Traditionally, spray guns and other equipment used to spray paint should be thoroughly cleaned after each use, and such a time-consuming cleaning of equipment and parts of the spray gun. The costs of solvents and consumables that generate waste during the cleaning of spray guns further increase costs and waste. The invention significantly reduces, up to a complete elimination, such waste and costs.

Traditional spray guns use fixed material nozzle sizes to remove fluid; if the material nozzle is adjustable, it must be thoroughly cleaned after each use. The invention allows you to work with material nozzles having dimensions that vary depending on the specific application or task, and do not require cleaning after use.

Disclosure of invention

The invention provides the creation of a spray gun with a disposable cartridge. The body of the cartridge is a hollow tube with outer and inner surfaces. The cartridge also has a connector for the reservoir (tank) with paint, a material nozzle with an outlet (nozzle) hole for removing the atomized fluid, a hole for the cap at the second end of the tube, as well as a locking needle, a seal for the locking needle, a gasket for the locking needle, compression spring, spring washer and cap. The cartridge is configured to be installed inside a typical spray gun and easily removed for discarding after use. To ensure compatibility with various types of spray guns, the cartridge can be given various shapes and sizes. The tank allows liquid, such as paint, chemical reagent, polish, varnish or other sprayed liquid, to flow into the hollow body of the cartridge. Compressed air is supplied to the spray gun, flowing around the cartridge, including its material nozzle, sucking the liquid out of the cartridge due to the siphon effect and spraying the liquid to apply it to the surface to be coated. The fluid-containing reservoir can be attached to the cartridge at the inlet of the connector. Alternatively, fluid may be supplied to the cartridge through a hose or in some other way. The configuration of the inlet of the connector with the tank can be varied in order to coordinate it with the specific type of tank or hose through which the liquid must enter the cartridge. The body of the cartridge, locking needle and cap can be made of many different materials, such as plastic, metal alloy or some kind of durable secondary material.

Brief Description of the Drawings

1, a cartridge according to the invention is shown in section;

figure 2 cartridge 1 is shown with a spatial separation of the parts;

figure 3 in section presents a typical spray gun with a cartridge placed in it.

The implementation of the invention

1, cartridge 1 is shown in longitudinal section. The cartridge 1 has a body 2, an outer surface 3, an inner surface 4, a material nozzle 5 tapering to a cone with an opening 6 for sprayed liquid, and an inlet 7 of the connector.

In figure 2, the cartridge 1 is shown with a spatial separation of the parts. It can be seen that it additionally contains a spring washer (E-clip) 8, a compression spring 9, a gasket 10, a seal 11, a cartridge cap 12 and a locking needle 13. The cap 12 has a mating end 14 and an end 15 for adjusting the position of the needle. In addition, a channel 16 is made in this cap 12, extending from one end 14 to the other end 15. The diameter of the channel 16 is sufficient so that the locking needle 13 can slide through the cap 12 of the cartridge.

Figure 2 also shows that the locking needle 13 has a tapered end 17 from the material nozzle side, a control end 18 and an annular groove 19 located approximately in the middle between the tapering (pointed) end 17 and the control end 18. The diameter of the locking needle 13 is selected slightly smaller than the diameter of the channel 16 in the cap of the cartridge, so that the locking needle 13 can slide to move along this channel. The diameter of the control end 18 exceeds the diameter of the channel 16 so that the locking needle 13 could not completely pass through the cap 12. During assembly, the locking needle 13 is carried forward, with the pointed end 17, through the cap 12 of the cartridge, starting from its end 15 to adjust the position of the needle. Then, the locking needle is passed through the sealing seal 11, which enters the cartridge cap 12 in a tight fit, preventing fluid from flowing out through the channel 16. Then, the gasket 10 and the compression spring 9 are sequentially mounted on the locking needle 13. After that, a spring washer 8 covering it is installed on the locking needle 13, which is inserted into the annular groove 19, thereby preventing the compression spring 9 and the gasket 10 from sliding off the locking needle 13. Then, the cap 12 is attached to the cartridge body 2 by introducing the mating end into the body 2 14 of this cap and its fixation relative to the body 2 with adhesive means. The holding of the cap 12 in the body 2 of the cartridge can also be ensured by friction, provided that its mating end is large enough so that it can enter the body 2 by friction fit relative to the inner surface 4.

1, the cartridge 1 is presented with a locking needle 13 in its initial position, in which its pointed end 17 is located inside the nozzle (outlet) hole 6. While the needle is in this position, liquid (or other fluid) cannot exit the cartridge 1 To start work, the locking needle 13 needs to be slightly shifted back relative to the starting position, which will allow the liquid to exit through the outlet 6. In addition, a reservoir (tank) with liquid (not shown) must be fixed in the inlet 7 of the connector, which will allow fluids enter the cartridge 1 by gravity.

Figure 3 shows the spray gun 20 with the cartridge 1 installed in a predetermined position, and with a reservoir (tank) 28 connected to the inlet 7 of the connector forming part of the cartridge 1. To ensure the functioning of the cartridge is placed in a cylindrical drum 21 of the housing of the spray gun 20. this inlet 7 of the connector with the tank protrudes from the specified drum 21 so that around this hole 7 is formed a seal that prevents leakage of air from the drum 21 around the inlet 7. At the spray gun Pellet 20 has a trigger 22, which sets the amount of compressed air entering the drum 21 of the spray gun housing 20, a lever assembly 23, an inlet air port 24 and an air nozzle 25. The trigger 22 is connected to the lever assembly 23, which translates the locking needle 13 into a working one position, displacing it relative to the initial position and thereby diverting the pointed end 17 of the locking needle 13 from the hole 6. Air under pressure enters the spray gun 20 through the inlet air port 24 and flows through the spray gun 20, leaving through the air th nozzle 25. The cartridge 1 is placed in the cylindrical drum 21 of the spray gun 20 so that a gap 26 is formed around the cartridge 1. This allows air under pressure to flow around and behind the cartridge 1, leaving through the air nozzle 25 of the spray gun 20. When the trigger 22 is pulled back , the locking needle 13 is displaced relative to its locking, initial position, allowing the fluid to flow under the action of gravity into the cartridge from the tank 28 and exit the cartridge 1 through the opening 6 of the material nozzle, spraying under the action of squeezing of air flowing out of the air nozzle 25 of the spray gun 20. The movement of the trigger 22 is limited by the adjusting handle 27, which is movably attached to the spray gun 20. This controls the amount of compressed air entering the spray gun 20, and, accordingly, the amount of liquid leaving the cartridge 1. Indeed, the amount of liquid sucked out through the outlet 6 from the cartridge 1 is determined by the flow of compressed air flowing around this hole: the stronger the air flow, the more liquid It is sucked out of hole 6. The diameter of this hole must be large enough for the type of fluid used. Larger bore diameters of 6 are required for more fluid liquids, and a larger diameter for larger viscous fluids.

The liquid does not come into contact with any internal part of the spray gun 20, which greatly facilitates its cleaning after use. Cartridge 1 and its components can be made of many different inexpensive materials, such as plastic, which will allow the user to discard the cartridges 1 after using them, thereby reducing the amount of cleaning or eliminating its need.

The invention has been disclosed above in sufficient detail to ensure compliance with the requirements of patent law and provide specialists with information sufficient for the practical implementation of new principles, i.e. for the design and use of the necessary specialized components. However, it should be clear that the invention can be implemented through various devices and equipment and that, without going beyond the scope of the invention, various modifications can be made to this equipment and its operating modes.

Claims (11)

1. A disposable cartridge (1) for use in spray guns, containing a body (2) in the form of a tube, the first end of which is equipped with a material nozzle (5) with an opening made at its apex, allowing fluid to escape through it, and on the second at the end of which there is a cap (12) with a through channel (16), an inlet (7) of the tank connector passing through the side wall of the body (2) and used to connect to the reservoir (28) with fluid and to supply fluid to the cartridge ( 1), locking needle capable of passing slide through the channel (16) made in the cap (12) and having an end (17) tapering to a cone to interact with the material nozzle hole (6), while the locking needle (13) is movable to provide an adjustable fluid flow exiting through the opening (6) of the material nozzle and / or blocking the fluid outlet through the specified opening, characterized in that the locking needle (13) is surrounded by a seal (11) that fits inside the cap (12) in a tight fit to prevent leakage of liquid in through the channel (16) formed in the cap (12). 2. A disposable cartridge according to claim 1, characterized in that it comprises a spring (9) connected to the locking needle and to the tube for holding the locking needle in contact with the opening of the material nozzle and thereby blocking the fluid outlet. 3. A disposable cartridge according to claim 2, characterized in that the spring (9) located inside the body (2) in the form of a tube covers a locking needle (13). 4. A disposable cartridge according to claim 3, characterized in that the locking needle (13) has a control end (18) and an annular groove (19) located between its tapering and control ends (17, 18). 5. A disposable cartridge according to claim 4, characterized in that the locking needle (13) is surrounded by a spring washer (8) inserted into the annular groove (19) thereby preventing the spring (9) from sliding off the locking needle (13). 6. A disposable cartridge according to claim 1, characterized in that the body (2) of the cartridge and / or the locking needle (13) are made of plastic. 7. Spray gun (20), comprising a housing, an inlet air port (24), an air nozzle (25), a disposable cartridge (1), made according to any one of claims 1 to 6, and a reservoir (28) with a fluid medium, attached to the inlet (7) of the connector provided by the cartridge (1), wherein compressed air can enter the spray gun (20) through the inlet air port (24), exiting through the air nozzle (25) and spraying the fluid coming out of the hole (6) of the material nozzle of the cartridge (1). 8. The spray gun according to claim 7, characterized in that it contains a cylindrical drum (21), in which the cartridge (1) is placed with the possibility of extraction. 9. The spray gun according to claim 8, characterized in that the cartridge (1) is placed with the possibility of extraction into the cylindrical drum (21) of the spray gun (20) in such a way that a gap (26) is formed around the cartridge (1), allowing air under pressure flow around and behind the cartridge (1), leaving through the air nozzle (25). 10. The spray gun according to claim 7 or 8, characterized in that it further comprises a trigger (22) that sets the amount of compressed air entering the spray gun (20). 11. Paint sprayer according to claim 10, characterized in that the trigger hook (22) is connected to a lever assembly (23) that transfers the locking needle (13) to its working position, displacing it from its initial position, in which its end converges onto a cone (17) ) is located in the hole (6) of the material nozzle, in a position that allows fluid to escape through the specified hole (6).

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