Search

DE-102024132877-A1 - spray nozzle

DE102024132877A1DE 102024132877 A1DE102024132877 A1DE 102024132877A1DE-102024132877-A1

Abstract

The invention relates to a spray nozzle (10, 100, 200, 300) for applying a coating, in particular for cavity preservation of a cavity of a car body or vehicle, with a nozzle body (12) and at least one medium connection (16, 18, 316) and at least one medium channel (26, 324, 326) inside the nozzle body (12) leading from the at least one medium connection (16, 18, 316) to an outlet opening (22, 30, 322), wherein at least two medium channels (24, 26, 324, 326) are arranged inside the nozzle body (12).

Inventors

  • Stefan Hildenbrand

Assignees

  • sidion Engineering GmbH

Dates

Publication Date
20260513
Application Date
20241111

Claims (17)

  1. Spray nozzle (10, 100, 200, 300) for applying a coating, in particular for cavity preservation of a cavity of a body or vehicle, with a nozzle body (12) and at least one medium connection (16, 18, 316) and at least one medium channel (26, 324, 326) inside the nozzle body (12) leading from the at least one medium connection (16, 18, 316) to an outlet opening (22, 30, 322), characterized in that at least two medium channels (24, 26, 324, 326) are arranged inside the nozzle body (12).
  2. spray nozzle after Claim 1 , characterized in that the spray nozzle (10, 100, 200, 300) is at least partially manufactured, in particular the part of the spray nozzle which has the medium channel(s), using a 3D printing process.
  3. Spray nozzle according to one of the preceding claims, characterized in that it is formed in one piece at least up to a holder (14).
  4. Spray nozzle according to one of the preceding claims, characterized in that the spray nozzle (10, 100, 200, 300) is made of plastic and/or metal.
  5. Spray nozzle according to one of the preceding claims, characterized in that the outlet opening (22, 30, 322) having in particular an elliptical cross-section has an angle in the range of 30° to 89°, preferably in the range of 50° to 89°, particularly preferably in the range of 60° to 89°, to the normal (340) of the nozzle body surface (342).
  6. Spray nozzle according to one of the preceding claims, characterized in that at least one outlet opening (22, 30, 322) is arranged on an end face (320) of the nozzle body (12).
  7. Spray nozzle according to one of the preceding claims, characterized in that at least one of the medium channels (24, 324, 326) has an inner diameter in the range of 0.5 mm to 3 mm.
  8. Spray nozzle according to one of the preceding claims, characterized in that several medium channels (324, 326) are connected to the first medium connection (316).
  9. Spray nozzle according to one of the preceding claims, characterized in that a second medium connection (18) is provided and at least one medium channel (24, 324) is connected to the first medium connection (16, 316) and at least one medium channel (26) is connected to the second medium connection (18).
  10. Spray nozzle according to one of the preceding claims, characterized in that a first and a second medium channel (24, 26) are arranged coaxially, wherein one of the medium channels (24) has a transition opening (28) opening into the other medium channel (26).
  11. spray nozzle after Claim 10 , characterized in that the transfer opening (28) and the outlet opening (22, 30) are arranged opposite each other.
  12. spray nozzle after Claim 10 or 11 , characterized in that several entry and exit openings (28, 22, 30) are provided.
  13. Spray nozzle according to one of the preceding claims, characterized in that several outlet openings (22, 30) are provided offset in the axial direction.
  14. Spray nozzle according to one of the preceding claims, characterized in that several outlet openings (22, 30) are provided offset in the circumferential direction.
  15. Method for applying a coating, in particular for cavity preservation of a cavity of a body or vehicle, in which a coating material is applied by means of a spray nozzle (10, 100, 200, 300), characterized in that two media with different pressures are supplied to the spray nozzle (10, 100, 200, 300) and the media are mixed within the spray nozzle (10, 100, 200, 300) to form the coating material before the coating material leaves the spray nozzle (10, 100, 200, 300) through an outlet opening (22, 30).
  16. Procedure according to Claim 15 , characterized in that the media in the spray nozzle (10, 100, 200, 300) are guided in different medium channels (24, 26).
  17. procedure according to one of the preceding Claims 15 or 16 , characterized in that one medium, in particular wax, is transferred from one medium channel (24) through a transfer opening (28) into the other medium channel (26) and is mixed there with the other medium, in particular air, and the mixture is then sprayed through the outlet opening (22, 30) of the spray nozzle (10, 100, 200).

Description

The invention relates to a spray nozzle for applying a coating, in particular for cavity preservation of a cavity in a car body or vehicle, comprising a nozzle body and at least one medium connection, as well as a medium channel inside the nozzle body leading from the at least one medium connection to an outlet opening. The invention further relates to a method for applying a coating, in particular for cavity preservation of a cavity in a car body or vehicle, in which a coating material is applied by means of a spray nozzle. Motor vehicles contain numerous cavities that are susceptible to corrosion. To reduce the risk of corrosion, it is common practice to coat the surfaces of these susceptible cavities, for example with wax. This is usually done using spray nozzles through which the coating medium can be applied. From the DE 30 04 495 A1 For example, an arrangement for the internal coating of cavities has become known, which has a control system for controlling several spray nozzles that serve for cavity preservation. The DE 10 2004 046 351 A1 A method for the automatic preservation of cavities in a motor vehicle using a spray system is disclosed, wherein a spray nozzle is inserted into a cavity to be preserved and wax is sprayed onto the inner walls of the cavity through the spray nozzle. The spray nozzle described therein is composed of multiple parts and comprises a nozzle base, a nozzle tube, a nozzle body, and a nozzle head. Also from the DE 25 26 702 A1 A spray nozzle is known. The spray nozzle consists of a tube closed at the end with slots, the planes of which enclose different angles with the tube axis. The WO 2012/022477 A1 This describes a spray nozzle with two coaxially arranged tubes. By rotating one tube relative to the other, the spray outlets can be opened or closed. A seal is located between the tubes. All known spray nozzles have in common that they only have one medium channel. A coating material, usually a mixture of wax and air, is fed into this medium channel. It has been shown that consistently high coating quality and reproducibility cannot always be guaranteed with such spray nozzles. It is suspected that the coating material, which consists of a mixture of wax and air, deposits itself in sections within the medium channel, leading to these problems. The object of the present invention is therefore to provide a spray nozzle with which the coating of surfaces, in particular of surfaces of cavities, can be carried out more reliably. According to the invention, this problem is solved by a spray nozzle for applying a coating, in particular for cavity preservation of a cavity in a car body or vehicle, comprising a nozzle body and at least one medium connection, as well as at least one medium channel inside the nozzle body leading from the at least one medium connection to an outlet opening, wherein at least two medium channels are arranged inside the nozzle body. If at least two medium channels are provided, one medium channel can be used for a first medium, for example, wax, and a second medium channel for a second medium, for example, air. The coating material to be sprayed from the nozzle can thus be supplied in separate medium channels, and the media can only be combined immediately before exiting the nozzle to create a coating mixture. Alternatively, it is possible to implement smaller diameter medium channels that lead directly to an outlet opening. Both measures described result in higher coating quality, better reproducibility, and less contamination outside the spray nozzle. It is particularly advantageous if the spray nozzle, at least partially, especially the part containing the medium channel(s), is manufactured using a 3D printing process. The entire spray nozzle can also be manufactured using a 3D printing process. Multiple medium channels can be created particularly easily and effectively using 3D printing. Furthermore, the relative positions of the medium channels can be precisely defined. Outlet openings can also be manufactured more accurately using 3D printing than, for example, by drilling, as was previously the standard practice. In particular, larger angles of the outlet openings relative to the normal to the nozzle body surface can be achieved, allowing for better adaptation of the spray nozzle to the specific coating task. Further advantages arise if the spray nozzle, at least except for one holder, is manufactured as a single piece. This prevents different components of the spray nozzle from shifting relative to each other and avoids the development of tolerances between different parts. Leaks at transitions between different parts of a spray nozzle can also be avoided if the spray nozzle is manufactured as a single piece, at least predominantly. A holder can be manufactured as a separate part and connected to the rest of the spray nozzle, for example, by soldering or welding. At least the rest of the spray nozzle can be manufactured as a single piece. However,