US3574953A - Drying and curing ovens - Google Patents

Drying and curing ovens Download PDF

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Publication number
US3574953A
US3574953A US800903A US3574953DA US3574953A US 3574953 A US3574953 A US 3574953A US 800903 A US800903 A US 800903A US 3574953D A US3574953D A US 3574953DA US 3574953 A US3574953 A US 3574953A
Authority
US
United States
Prior art keywords
chamber
gas
oven
open side
duct means
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
US800903A
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English (en)
Inventor
Dennis George Furnell
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.)
Ayrodev Processes Ltd
Original Assignee
Ayrodev Processes Ltd
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 Ayrodev Processes Ltd filed Critical Ayrodev Processes Ltd
Application granted granted Critical
Publication of US3574953A publication Critical patent/US3574953A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F26B23/02—Heating arrangements using combustion heating
    • F26B23/022—Heating arrangements using combustion heating incinerating volatiles in the dryer exhaust gases, the produced hot gases being wholly, partly or not recycled into the drying enclosure

Definitions

  • This invention relates to drying and curing ovens which effect rapid and uniform solvent evaporation and curing of varnish films, particularly on hollow or irregularly shaped objects.
  • the rate of entry of objects into the oven can be controlled in order progressively to flash evaporate most of the solvent in the coating of the objects as they enter the oven, thereby ensuring uniform cure of the varnish medium and avoiding building up a dangerous concentration of solvent vapor within the oven.
  • a drying and curing oven for varnish or lacquer coated articles comprises an inverted compartment of any desired cross-sectional shape through which heated air is circulated by entry into the heating compartment via a space around all or part of the periphery of the base and wherein exhaustion is effected via one or more ducts located on the top of said compartment.
  • the base of the oven is open and circulation, temperature, and venting conditions are balanced so that articles or objects may be progressively raised into the oven compartment without that balance being disturbed.
  • the heating source for the air is by direct combustion
  • ventilation by means of convection ducting or fan also located in the top of the oven in addition to recirculation of the heated air, may be incorporated in order to compensate for the entry and expansion of gaseous combustion products.
  • a mixture of air from impeller I, and diesel fuel from pipe 2 is ignited in tube 3 so that the flame emerges into the venturi chamber 4 where it meets the stream of circulating air from an annular space 5 impelled by fan 6.
  • the mixture of heated air and combustion products is introduced into the bottom of an oven 13 after passing down a space or duct 19 formed between the inner and outer walls 7 and 8 of said oven.
  • This mixture is withdrawn by said fan 6 from one, or preferably two or more exit ports 9 and 10 in the top wall of the oven and continuously recirculated.
  • additional ducting ll incorporating an exhaust fan 22 is also incorporated in the top of the oven chamber.
  • This ducting also incorporates an adjustable damper 12 or the like, in order to control the rate of ventilation and thereby facilitate achieving a state of balance at the open base of the oven 13.
  • the oven 13 is supported by suitable means, such as legs 14 above the floor to permit entry of the objects to be heated.
  • Objects may be either hoisted into the oven by means of a chain 15 or chains winched at 16 from above the oven roof, or raised into the oven by mechanical, pneumatic or hydraulic means, for example by a hydraulically operated and elevated table 17.
  • the raisable tackle itself may be of open construction.
  • the heated air may be introduced into the oven chamber by exterior ducting this is not desirable, on the grounds of thermal efficiency. Entry countercurrently by way of the space between the exterior and interior walls 7 and 8 is preferred. This space may completely surround the interior vertical wall 7 or it may be limited to spaces between opposite exterior and interior walls. Likewise, if the oven chamber is of circular section, the space may be annular or confined to the peripheries of opposite sectors.
  • the object of the venturi chamber 4 is to prevent interference with the flame when direct heating is employed, for example by creating back pressure or blowing the flame out.
  • the design of the venturi chamber 4 may be varied according, for example, to the position of the fan.
  • deflector rims 20 or louvers are incorporated along the periphery of the orifice of the duct 19 at the inlet edge of the inner wall of the oven.
  • adjustable dampers as at 12 may be incorporated into the spaces between the interior and exterior oven walls 7 and 8. It should be understood that for thermal efficiency the oven and circulatory ducting should be adequately lagged.
  • a drying or curing oven for varnish or lacquer coated articles comprising, in combination:
  • a compartment having I. double upright walls, the inner one of said walls bounding an oven chamber downwardly open to atmosphere surrounding the r (en, the outer and inner walls defining therebetween first duct means for supplying a gas to said chamber, said duct means having orifice means extending about the downwardly directed open side of said chamber for discharging the supplied gas, and
  • second duct means extending from said top wall and communicating with said chamber for exhausting gas from the same;
  • deflecting means along said inner wall adjacent said orifice for deflecting said supplied gas and for thereby minimizing turbulence at said open side;
  • damper means in one of said duct means for controlling the flow of gas through said chamber between said first and second duct means and for thereby achieving a state of balance in the gas at said open side;
  • heating means for heating the gas supplied by said first duct means
  • recirculating means for returning a portion of the exhausted gas to said chamber.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
US800903A 1968-09-24 1969-02-20 Drying and curing ovens Expired - Lifetime US3574953A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB45284/68A GB1237263A (en) 1968-09-24 1968-09-24 Improvements in or relating to drying and curing ovens

Publications (1)

Publication Number Publication Date
US3574953A true US3574953A (en) 1971-04-13

Family

ID=10436618

Family Applications (1)

Application Number Title Priority Date Filing Date
US800903A Expired - Lifetime US3574953A (en) 1968-09-24 1969-02-20 Drying and curing ovens

Country Status (14)

Country Link
US (1) US3574953A (enExample)
JP (1) JPS4949149B1 (enExample)
BE (1) BE739216A (enExample)
DE (1) DE1935692A1 (enExample)
DK (1) DK120279B (enExample)
ES (1) ES371766A1 (enExample)
FI (1) FI53627C (enExample)
FR (1) FR2018703A1 (enExample)
GB (1) GB1237263A (enExample)
IE (1) IE33295B1 (enExample)
MY (1) MY7200063A (enExample)
NL (1) NL6914384A (enExample)
NO (1) NO126815B (enExample)
SE (1) SE357817B (enExample)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4575951A (en) * 1984-04-04 1986-03-18 Eyzaguirre Ramon C Closed chamber dryer
US7007402B1 (en) * 2004-10-19 2006-03-07 Novatec, Inc. System and method for drying particulate materials using heated gas
US20160091248A1 (en) * 2013-05-10 2016-03-31 Novimpianti Drying Technology S.R.L. Combustion system and method for heating process air for paper drying systems

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE401398B (sv) * 1976-05-21 1978-05-02 Vico Kem Tekn Fabrik Ab Forfarande och apparat for torkning av losningsmedelsbehandlade foremal
DE4312892A1 (de) * 1993-04-21 1994-10-27 Burkamp En Und Anlagentechnik Lacktrocknungsanlage
CN105387695B (zh) * 2015-12-07 2018-01-23 中冶南方(武汉)威仕工业炉有限公司 一种转移抓斗烘干器
CN115854668A (zh) * 2022-12-06 2023-03-28 河南茶树花农业科技有限公司 茶树花干燥萃取一体机和茶树花干燥萃取方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1610809A (en) * 1926-02-15 1926-12-14 Gen Electric Electric furnace
US1636041A (en) * 1923-02-09 1927-07-19 Harry O Breaker Electric furnace
US2110209A (en) * 1934-10-13 1938-03-08 Baker Perkins Co Inc Furnace
US2627838A (en) * 1948-06-08 1953-02-10 Lancashire Dynamo & Crypto Ltd Apparatus for impregnating solid bodies
US2966573A (en) * 1960-12-27 hansen
US3126198A (en) * 1964-03-24 Heating device
US3262420A (en) * 1962-03-22 1966-07-26 Galvarplast S N C Coating and oven system including work handling means

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2966573A (en) * 1960-12-27 hansen
US3126198A (en) * 1964-03-24 Heating device
US1636041A (en) * 1923-02-09 1927-07-19 Harry O Breaker Electric furnace
US1610809A (en) * 1926-02-15 1926-12-14 Gen Electric Electric furnace
US2110209A (en) * 1934-10-13 1938-03-08 Baker Perkins Co Inc Furnace
US2627838A (en) * 1948-06-08 1953-02-10 Lancashire Dynamo & Crypto Ltd Apparatus for impregnating solid bodies
US3262420A (en) * 1962-03-22 1966-07-26 Galvarplast S N C Coating and oven system including work handling means

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4575951A (en) * 1984-04-04 1986-03-18 Eyzaguirre Ramon C Closed chamber dryer
US7007402B1 (en) * 2004-10-19 2006-03-07 Novatec, Inc. System and method for drying particulate materials using heated gas
US20160091248A1 (en) * 2013-05-10 2016-03-31 Novimpianti Drying Technology S.R.L. Combustion system and method for heating process air for paper drying systems

Also Published As

Publication number Publication date
NO126815B (enExample) 1973-03-26
BE739216A (enExample) 1970-03-02
MY7200063A (en) 1972-12-31
JPS4949149B1 (enExample) 1974-12-25
GB1237263A (en) 1971-06-30
DE1935692A1 (de) 1970-04-23
FI53627C (fi) 1978-06-12
NL6914384A (enExample) 1970-03-26
SE357817B (enExample) 1973-07-09
FR2018703A1 (enExample) 1970-06-26
IE33295B1 (en) 1974-05-15
ES371766A1 (es) 1971-11-16
DK120279B (da) 1971-05-03
FI53627B (enExample) 1978-02-28
IE33295L (en) 1970-03-24

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