DE102019005166A1 - Device for cleaning lamellar heat exchangers in horizontal or inclined position - Google Patents

Abstract

Lamellar heat exchangers are installed horizontally, at an angle, and vertically. When cleaning by blasting, the jet emerging at high speed creates a counterpressure that pushes the jet away from the surface. This reduces the cleaning effect. In addition, manual cleaning increases the effort required to hold the blasting device in place. By using the rollable blasting device, the counterpressure of the jet is counteracted by the weight of the blasting head of the rollable blasting device, which is balanced against the force of the counterpressure. This enables precise cleaning with a constant distance between the nozzle outlet and the surface to be cleaned and considerably reduces the effort required for cleaning. When cleaning lamellar heat exchangers in a horizontal position (table cooler) or inclined position (V-cooler), the rollable blasting device has considerable advantages in terms of cleaning quality and effort.

Description

The cleaning of heat exchangers is mostly done by high pressure water cleaning and / or by introducing chemicals into the exchanger.

Out EP 2,887,866 it is also known to clean finned heat exchangers with a compressed air / water mixture. In these cleaning processes, the blasting medium and, if necessary, the blasting or cleaning agent are directed onto the surface of the heat exchanger by means of a nozzle. This creates a considerable recoil, which requires a corresponding counterforce that would otherwise be thrown away from the surface of the jet nozzle. This is relatively problem-free without a lance extension if the surfaces of the heat exchangers are freely accessible. However, if blasting lances have to be used, the operator has to exert a great deal of force in manual use due to the counter pressure of the blasting nozzle. Due to this effort, the surfaces of the heat exchangers can usually not be cleaned completely and thoroughly. In the case of built-in lamellar heat exchangers, e.g. in oil coolers in locomotives, the use of jet lances is essential.

The aim and purpose of the invention is to carry out a thorough and comprehensive cleaning for exchangers in a horizontal position or in an inclined position with a greatly reduced expenditure of force compared to the previously common jet lances. This is achieved by installing a jet head on the upstream end of the lance. The jet head picks up the flow of water or the compressed air / water mixture from the lance, deflects the flow in the desired jet direction of mostly 90 ° into the jet nozzle attached to the jet head. Jet nozzle. The blasting head can also have two or more feeds, the mixing of the introduced media / equipment then only takes place in the blasting head.

A rollable unit, e.g. in the form of a roller or a ball, is also attached to the steel head. This rollable unit is preferably adjustable at least in height. In any case, the rolling surface of the unit protrudes deeper to the surface to be cleaned than the jet nozzle. The optimal distance from the nozzle outlet to the surface for the cleaning effect can be set appropriately using the adjustable roller unit. Due to the constant distance from the nozzle outlet to the surface to be cleaned, the cleaning is consistently optimal over the entire surface to be cleaned.

The weight of the jet head, nozzle and lance is balanced in such a way that the counter pressure caused by this weight is at least the same, preferably greater than the maximum force of the counter pressure caused by the nozzle jet. The nozzle cannot be pushed up by the jet directed onto the surface. The effort required for cleaning is greatly reduced, and cleaning can be carried out thoroughly and across the entire surface.

List of reference symbols

1

Jet lance

2

Jet head

3

Jet nozzle

4th

rollable unit

5

output

6th

Rolling surface

7th

surface to be cleaned

8th

Height adjustment

9

Plastic coating

10

Lateral limits

11

Flow channel

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• EP 2887866 [0002]

Claims (4)

Blasting device consisting of at least one blasting lance 1, at least one blasting head 2 installed at the upstream end of the blasting lance with a flow channel 11, at least one blasting nozzle 3 and at least one rollable unit 4 on blasting head 2, the outlet 5 of blasting nozzle 3 towards blasting head 2 above Rolling surface 6 of the rollable unit 4 is arranged and the total weight of the blasting device at the upstream end of the blasting lance is at least approximately equal to or greater than the counterforce exerted by the flow pressure of the blasting nozzle 3 in operation on the surface 7 to be cleaned. Blasting device according to Claim 1 , characterized in that the rollable unit 4 is designed to be adjustable via the height adjustment 8. Blasting device according to Claim 1 +2, characterized in that the jet head 2 and / or the jet lance 1 are provided with the plastic jacket 9 in order to avoid damage to the surfaces of the lateral boundaries 10 Blasting device according to Claim 1 - 3 , characterized in that the blasting device is operated with a compressed air / water mixture

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