DE4230899A1 - Vacuum drying appts. with programmed control of temp. - is subject to adaptive control allowing for mathematical relationship between residual pressure and surface temp. variation - Google Patents

Vacuum drying appts. with programmed control of temp. - is subject to adaptive control allowing for mathematical relationship between residual pressure and surface temp. variation

Info

Publication number
DE4230899A1
DE4230899A1 DE19924230899 DE4230899A DE4230899A1 DE 4230899 A1 DE4230899 A1 DE 4230899A1 DE 19924230899 DE19924230899 DE 19924230899 DE 4230899 A DE4230899 A DE 4230899A DE 4230899 A1 DE4230899 A1 DE 4230899A1
Authority
DE
Germany
Prior art keywords
temp
vacuum drying
variation
subject
residual pressure
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.)
Withdrawn
Application number
DE19924230899
Other languages
German (de)
Inventor
Klaus Hoffmann
Detlef Beyer
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.)
HOFFMANN KLAUS O-1550 NAUEN DE
Original Assignee
HOFFMANN KLAUS O-1550 NAUEN DE
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 HOFFMANN KLAUS O-1550 NAUEN DE filed Critical HOFFMANN KLAUS O-1550 NAUEN DE
Priority to DE19924230899 priority Critical patent/DE4230899A1/en
Publication of DE4230899A1 publication Critical patent/DE4230899A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B5/00Drying solid materials or objects by processes not involving the application of heat
    • F26B5/04Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
    • F26B5/048Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum in combination with heat developed by electro-magnetic means, e.g. microwave energy

Abstract

An infrared radiator (4) is heated continuously to a basic temp. and after starting of the vacuum pump the b.pt of water is attained quickly as pressure in the vessel (1) falls. A pressure transducer (7) starts the stored-program control (6) of heating so that the articles (2) are dried at a constant temp. measured by a probe (3). For porous articles heat is produced by microwave electrodes with regulated field strength. USE/ADVANTAGE - With heat-sensitive capillary and porous filter elements or metal-plastics composites, drying time is shortened and overheating prevented with less complex vacuum appts.

Description

Field of application of the invention

Vacuum drying of particularly temperature-sensitive parts capillary and porous structures after aqueous cleaning, for example filter candles or metal-plastic composite parts.

State of the art

So far, problem areas of precision engineering have mostly been dealt with CFC-based water displacers cleaned and dried. So far, vacuum drying from the Food industry and chemistry known, is mostly for the Removal of residual moisture used. With the ban on CFCs and the transition to watery ones Cleaning process is becoming increasingly complex Vacuum drying also used for precision parts. Previously known solutions use for heat transfer and Discharge the water vapor a regulated air supply. A program controlled heat supply depending on temperature and Negative pressure with self-learning optimization of the process not yet known.

Aim of the invention

Compared to the previously known solutions, in which the object the heat required to evaporate the water is several times higher or controlled air intake is supplied to the Drying time reduced and too high Warming can be excluded.

Embodiment

The infrared emitters ( 4 ) are constantly heated up to a basic value. After switching on the vacuum pump, the boiling point of the adhering water is quickly reached and the pressure in the vessel ( 1 ) decreases. The pressure transmitter ( 7 ) starts the program control ( 6 ) which changes the heating output according to a program stored in the memory so that the objects ( 2 ) to be dried are always at a constant temperature. The control sensor ( 3 ) is required to determine the values to be programmed. An internal signal processor can optimize the energy supply from the course of the pressure and temperature curve until an isothermal course and thus the physically shortest possible drying time is reached.

This method is to be used in a modified form for porous objects. The heating is expediently carried out here using a high-frequency field (microwave) generated by electrodes ( 4 ), the intensity of which is regulated. For the temperature detection, infrared sensors ( 8 ) are required, which due to the low temperatures can also be cooled to a defined temperature by Peltier elements ( 10 ).

Claims (6)

1. Vacuum drying device consisting of a temperature measuring device ( 3 ) or ( 8 ), heat source ( 4 ), vacuum vessel ( 1 ), characterized in that between the temperature measuring device ( 3 ), and and vacuum measuring device ( 7 ) and controlled heat source ( 4 ), ( 5 ), a program control ( 6 ) is interposed.
2. Vacuum drying device according to claim 1, characterized in that the heat source ( 4 ) is an RF or microwave radiator.
3. Vacuum drying device according to claim 1, characterized in that the heat source ( 4 ) is a magnetic induction device.
4. Vacuum drying device according to claim 1 to 3, characterized in that in front of the objects to be dried ( 2 ) infrared sensors ( 8 ) are in a tube ( 9 ) which in turn is heat-conducting with the Peltier element ( 10 ) arranged outside the vessel ( 1 ). connected is.
5. Vacuum drying device according to claim 1 to 4, characterized in that the infrared sensors ( 8 ) consist of two individual sensors which face the inside of the tube and the object to be dried with the sensitive side.
6. Vacuum drying device according to claim 1 to 5, characterized in that a complete control system is assigned to each object ( 2 ).
DE19924230899 1992-09-11 1992-09-11 Vacuum drying appts. with programmed control of temp. - is subject to adaptive control allowing for mathematical relationship between residual pressure and surface temp. variation Withdrawn DE4230899A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19924230899 DE4230899A1 (en) 1992-09-11 1992-09-11 Vacuum drying appts. with programmed control of temp. - is subject to adaptive control allowing for mathematical relationship between residual pressure and surface temp. variation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19924230899 DE4230899A1 (en) 1992-09-11 1992-09-11 Vacuum drying appts. with programmed control of temp. - is subject to adaptive control allowing for mathematical relationship between residual pressure and surface temp. variation

Publications (1)

Publication Number Publication Date
DE4230899A1 true DE4230899A1 (en) 1993-03-18

Family

ID=6468036

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19924230899 Withdrawn DE4230899A1 (en) 1992-09-11 1992-09-11 Vacuum drying appts. with programmed control of temp. - is subject to adaptive control allowing for mathematical relationship between residual pressure and surface temp. variation

Country Status (1)

Country Link
DE (1) DE4230899A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4439694A1 (en) * 1994-11-05 1996-05-09 Laempe Joachim Appts. for drying casting moulds or cores
FR2746910A1 (en) * 1996-03-28 1997-10-03 Yagi Shunichi Method and apparatus for drying reduced pressure materials by microwave and infrared heaters
EP1574265A2 (en) * 2004-03-12 2005-09-14 Romaco S.r.l. A wash booth for containers
WO2009021941A1 (en) * 2007-08-13 2009-02-19 Alcatel Lucent Method of treating a transport support for the atmospheric storage and conveyance of semiconductor substrates, and treatment station for the implementation of such a method
DE102008062949A1 (en) * 2008-12-23 2010-06-24 Hüttinger Elektronik Gmbh + Co. Kg Induction heating- and plasma processes controlling method for workpiece in industry, involves determining controller parameter according to adjusted model of control path, and adjusting controller based on controller parameter

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4439694A1 (en) * 1994-11-05 1996-05-09 Laempe Joachim Appts. for drying casting moulds or cores
FR2746910A1 (en) * 1996-03-28 1997-10-03 Yagi Shunichi Method and apparatus for drying reduced pressure materials by microwave and infrared heaters
CN1118675C (en) * 1996-03-28 2003-08-20 八木俊一 Method for drying material and its device
EP1574265A2 (en) * 2004-03-12 2005-09-14 Romaco S.r.l. A wash booth for containers
EP1574265A3 (en) * 2004-03-12 2005-11-09 Romaco S.r.l. A wash booth for containers
US7617831B2 (en) 2004-03-12 2009-11-17 Romaco S.R.L. Wash booth for containers
WO2009021941A1 (en) * 2007-08-13 2009-02-19 Alcatel Lucent Method of treating a transport support for the atmospheric storage and conveyance of semiconductor substrates, and treatment station for the implementation of such a method
US8898930B2 (en) 2007-08-13 2014-12-02 Alcatel Lucent Method for treating a transport support for the conveyance and atmospheric storage of semiconductor substrates, and treatment station for the implementation of such a method
DE102008062949A1 (en) * 2008-12-23 2010-06-24 Hüttinger Elektronik Gmbh + Co. Kg Induction heating- and plasma processes controlling method for workpiece in industry, involves determining controller parameter according to adjusted model of control path, and adjusting controller based on controller parameter
DE102008062949B4 (en) * 2008-12-23 2014-09-11 TRUMPF Hüttinger GmbH + Co. KG Method for adaptively controlling an induction heating or plasma process

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Legal Events

Date Code Title Description
OAV Applicant agreed to the publication of the unexamined application as to paragraph 31 lit. 2 z1
8139 Disposal/non-payment of the annual fee