EP0387886B1 - Verfahren zum Reinigen von Gegenständen - Google Patents

Verfahren zum Reinigen von Gegenständen Download PDF

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Publication number
EP0387886B1
EP0387886B1 EP19900104956 EP90104956A EP0387886B1 EP 0387886 B1 EP0387886 B1 EP 0387886B1 EP 19900104956 EP19900104956 EP 19900104956 EP 90104956 A EP90104956 A EP 90104956A EP 0387886 B1 EP0387886 B1 EP 0387886B1
Authority
EP
European Patent Office
Prior art keywords
cleaning
bath
pressure
temperature
approximately
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19900104956
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0387886A3 (de
EP0387886A2 (de
Inventor
Jürgen Uhlig
Peter Hösel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Duerr GmbH
Original Assignee
Duerr GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Duerr GmbH filed Critical Duerr GmbH
Publication of EP0387886A2 publication Critical patent/EP0387886A2/de
Publication of EP0387886A3 publication Critical patent/EP0387886A3/de
Application granted granted Critical
Publication of EP0387886B1 publication Critical patent/EP0387886B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/04—Cleaning involving contact with liquid
    • B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
    • B08B3/12—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration by sonic or ultrasonic vibrations

Definitions

  • the invention relates to a method for cleaning objects in a heated detergent bath under the action of ultrasound.
  • the invention has for its object to improve the method of the type mentioned in its cleaning effect.
  • This object is achieved in that the detergent bath is exposed to a pressure above atmospheric pressure and to a temperature is heated, which is above the temperature at which the first vapor bubbles occur under atmospheric pressure, but below the boiling temperature given at the respective excess pressure.
  • metal parts contaminated with grinding and polishing paste are to be cleaned, they have previously been placed in a container which is open at the top and on the bottom of which there are radiators.
  • the cleaning bath consisted of an aqueous washing solution which was heated to approx. 85 ° C.
  • the metal parts were slowly rotated in the bathroom and sonicated on all sides.
  • a pressure container provided with a pressure-tightly closable loading and removal opening is separated in a separate manner Process steps cleaned and sterilized.
  • a plurality of ultrasonic generators are attached to the outside of the container wall, and one embodiment of the pressure container is provided with an electrical heating device arranged inside it.
  • a spray tube is arranged, with the help of which objects to be cleaned can be sprayed off and the pressure vessel can be flooded with a cleaning liquid
  • the pressure vessel has a drain opening for used cleaning fluid, a suction opening for evacuating the pressure vessel and an inlet opening for feeding of hot water vapor.
  • the cleaning liquid supplied to the pressure vessel contains a considerable amount of gases dissolved in the latter and entrained by the latter are considered to be disadvantageous for the cleaning process.
  • the pressure vessel is evacuated after the cleaning liquid supply has ended and the cleaning liquid is degassed as a result of this and by exposure to the cleaning liquid, whereupon the objects to be cleaned and immersed in the cleaning liquid are cleaned by exposure to the cleaning liquid with ultrasound.
  • the cleaning liquid in the pressure container can be heated with the electric heating device; during the loading of the pressure container with cleaning liquid and / or during the heating of the cleaning liquid in the closed pressure container, the pressure can rise slightly above atmospheric pressure before the pressure container is evacuated before the start of the ultrasound-assisted cleaning process.
  • the cleaning liquid is drained from the pressure container and the cleaned objects are sterilized, for which purpose hot water vapor is introduced into the pressure container in one embodiment of this known cleaning method.
  • the detergent bath is placed in a closed container and pressurized.
  • the temperature is brought to 100 ° C. or slightly above, which surprisingly considerably increases the cleaning effect.
  • grinding and polishing paste residues soften at these elevated temperatures and flake off from the metal objects to be cleaned.
  • the pressure increase can only be achieved by heating the bath in a closed container; alternatively, an excess pressure can also be generated in the container above the bath by means of a pressure source, for example an air pump.
  • a pressure source for example an air pump.
  • a cleaning agent bath made of chlorinated hydrocarbons can go to significantly higher temperatures and thereby achieve very excellent cleaning performance.
  • a pressure-resistant container 1 which is constructed similarly to a pressure cooker, has an upwardly open container body 3 and a lid 2. Both handles 10 and 11 are assigned, which enable the lid 2 to be put on and locked by means of a bayonet catch 9 (not shown).
  • An electrical resistance heater 6 is assigned to the wall of the container body, but could also be replaced by another heat source, such as a heating jacket fed with steam or a gas heater.
  • An ultrasonic vibrator 7 is arranged on the bottom of the container body 3 and is acted upon by a high-frequency generator 8.
  • a safety valve 4 and a pressure display and / or pressure control device 5 are assigned to the cover 2.
  • a cleaning agent bath 16 which can be emptied into a tank 15 via a pipeline 17, which contains a solenoid valve 13 and a pump 14.
  • control unit 12 which controls the temperature of the heater 6, the energy supply to the ultrasonic vibrator 7, the solenoid valve 13, the pump 14 and the pressure control device 5.
  • the temperature in the bath 16 is increased by means of the heater 6 to such an extent that an excess pressure of 0.01 to 2 bar, preferably approximately 0.02 to 0.5 bar, is established in the container 1. In the case of an aqueous cleaning solution, an excess pressure of approximately 0.2 bar is preferred.
  • the excess pressure can also or additionally be achieved by connecting the container 1 to a pressure source, for example an air pump.
  • a pressure source for example an air pump.
  • the temperature in the bath 16 is in any case adjusted so that it is above the temperature at which the first vapor bubbles form under atmospheric pressure. Such phenomena are the formation of bubbles on the surfaces wetted by the bath or the formation of the first steam. As a rule, it is sufficient to raise the bath temperature to just below or just above the boiling point of the respective bath liquid, for example to 90 to 105 ° C., preferably approx. 100 to 103 ° C. when using an aqueous cleaning liquid.
  • the entire bath liquid can be pumped into the tank 15 and cleaned and processed on this occasion. Then it can be returned to the container.

Landscapes

  • Cleaning By Liquid Or Steam (AREA)
EP19900104956 1989-03-16 1990-03-16 Verfahren zum Reinigen von Gegenständen Expired - Lifetime EP0387886B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3908722 1989-03-16
DE19893908722 DE3908722C1 (enrdf_load_stackoverflow) 1989-03-16 1989-03-16

Publications (3)

Publication Number Publication Date
EP0387886A2 EP0387886A2 (de) 1990-09-19
EP0387886A3 EP0387886A3 (de) 1991-07-17
EP0387886B1 true EP0387886B1 (de) 1994-03-02

Family

ID=6376541

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900104956 Expired - Lifetime EP0387886B1 (de) 1989-03-16 1990-03-16 Verfahren zum Reinigen von Gegenständen

Country Status (2)

Country Link
EP (1) EP0387886B1 (enrdf_load_stackoverflow)
DE (1) DE3908722C1 (enrdf_load_stackoverflow)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3942471C1 (en) * 1989-12-22 1991-01-10 Kernforschungszentrum Karlsruhe Gmbh, 7500 Karlsruhe, De Sodium removal from surface of construction parts - by cleaning parts using ultrasonics in liq. hydrocarbon cleaning medium
EP0608363A1 (en) * 1991-10-04 1994-08-03 Cfmt, Inc. Ultracleaning of involuted microparts

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2055289B (en) * 1979-08-01 1983-09-14 American Sterilizer Co Cleaning and biocidal treatment of articles
DE3776107D1 (de) * 1986-11-29 1992-02-27 Bbc Brown Boveri & Cie Reinigungsverfahren fuer ein elekrisches isolierteil.

Also Published As

Publication number Publication date
EP0387886A3 (de) 1991-07-17
DE3908722C1 (enrdf_load_stackoverflow) 1990-05-31
EP0387886A2 (de) 1990-09-19

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