EP1701121A2 - Wärmebehandlungsofen - Google Patents

Wärmebehandlungsofen Download PDF

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Publication number
EP1701121A2
EP1701121A2 EP20060110907 EP06110907A EP1701121A2 EP 1701121 A2 EP1701121 A2 EP 1701121A2 EP 20060110907 EP20060110907 EP 20060110907 EP 06110907 A EP06110907 A EP 06110907A EP 1701121 A2 EP1701121 A2 EP 1701121A2
Authority
EP
European Patent Office
Prior art keywords
subject
thermally treated
fan
thermal
thermal treatment
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Withdrawn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
EP20060110907
Other languages
English (en)
French (fr)
Other versions
EP1701121A3 (de
Inventor
Yoshiyuki c/o Edison Hard Fujita
Hideto c/o Edison Hard Fujita
Yoshio c/o Edison Hard Matsumura
Kazuhide c/o Edison Hard Hatano
Ryoji c/o Edison Hard Fujino
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.)
EDISON HARD
Original Assignee
EDISON HARD
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 EDISON HARD filed Critical EDISON HARD
Publication of EP1701121A2 publication Critical patent/EP1701121A2/de
Publication of EP1701121A3 publication Critical patent/EP1701121A3/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
    • F27B5/06—Details, accessories or equipment specially adapted for furnaces of these types
    • F27B5/16—Arrangements of air or gas supply devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
    • F27B5/04—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated adapted for treating the charge in vacuum or special atmosphere
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
    • F27B5/06—Details, accessories or equipment specially adapted for furnaces of these types
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D7/00—Forming, maintaining or circulating atmospheres in heating chambers
    • F27D7/04—Circulating atmospheres by mechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D9/00—Cooling of furnaces or of charges therein
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D7/00—Forming, maintaining or circulating atmospheres in heating chambers
    • F27D7/04—Circulating atmospheres by mechanical means
    • F27D2007/045—Fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D9/00—Cooling of furnaces or of charges therein
    • F27D2009/007—Cooling of charges therein
    • F27D2009/0072—Cooling of charges therein the cooling medium being a gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D9/00—Cooling of furnaces or of charges therein
    • F27D2009/007—Cooling of charges therein
    • F27D2009/0072—Cooling of charges therein the cooling medium being a gas
    • F27D2009/0075—Cooling of charges therein the cooling medium being a gas in direct contact with the charge

Definitions

  • the present invention relates to a thermal treatment furnace for subjecting a subject to be thermally treated to quenching and the like.
  • a vacuum thermal treatment furnace As an apparatus for subjecting a subject to be thermally treated such as a mold to quenching, a vacuum thermal treatment furnace is known (see the following patent document).
  • the typical vacuum thermal treatment furnace after the subject to be thermally treated is heated for a predetermined time in the furnace being formed a vacuum, the subject to be thermally treated is put into an oil tank, or the low temperature cooling gas is stirred using a fan during charging therein, thereby rapidly cooling the subject to be thermally treated.
  • To cool the subject to be thermally treated using gas has many merits that the subject to be thermally treated is not contaminated by oil, and the cooling speed is lowered so that thermal deformation of the subject to be thermally treated can be avoided.
  • Patent Document 1 Japanese Patent Application Laid-Open No.H10-183236
  • the cooling step is only a portion of the entire steps. Usually, it takes one to two hours for increasing the temperatures in the furnace and of the subject, it takes several hours for a soaking step, and it takes one to two hours for a cooling step of the subject. That is, the time for driving the fan using the electric motor is only about one to two hours, time during which the electric motor and the fan are stopped is longer.
  • the electric motor is operated only for several hours a day, from the standpoint of an electric company which generates and supplies electricity, it is necessary to always keep holding electricity-generating ability and electricity-supplying ability so that no problem is generated whenever the electric motor is operated.
  • the actual electric bill is a sum of a charge on an as-used basis corresponding to consumed electricity and a basic charge corresponding to the equipment electricity.
  • An electric motor of high output increases the equipment electricity value and thus, time during which the electric motor is not operated a day is long irrespective of high basic charge. Users of thermal treatment furnaces bear illogical costs.
  • the present invention contrived with an innovative idea based on an attempt first focusing on the above noted problems, provides a thermal treatment furnace having a thermal engine, for subjecting a subject to be thermally treated to a quenching treatment, wherein the thermal engine drives a fan for a period during which the subject to be thermally treated is cooled.
  • the thermal treatment furnace of the present invention is suitable for being operated in various countries where electricity circumstances are unstable as compared with Japan.
  • a thermal treatment furnace of the embodiment is a vacuum thermal treatment furnace in which a subject to be thermally treated W in its vacuum state is heated and then, the subject to be thermally treated W is put into an oil tank 26, or cooling fluid is stirred by a fan 5 while the cooling fluid being charged therein, thereby rapidly cooling the subject to be thermally treated W.
  • the thermal treatment furnace is of a double structure including a heating chamber 1 for heating the subject to be thermally treated W, and a cooling chamber 2 for cooling the subject to be thermally treated W heated in the heating chamber 1.
  • the thermal treatment furnace is provided with a thermal insulation body 12, a heater 14, a vacuum exhaust system 3 and the like, as a part of the heating chamber 1, and provided with an oil tank 26, a fluid introducing system 4, the fan 5 and the like; as a part of the cooling chamber 2.
  • the substantially box-like thermal insulation body 12 is disposed in a furnace barrel 11 which is an outer shell of the heating chamber 1, and disposed inside is the heater 14, thereby constituting a thermal treatment space for heating the subject to be thermally treated W.
  • a thermal insulating lid 13 being openable and closable is provided on the side of the cooling chamber 2 of the thermal insulation body 12. The thermal insulating lid 13 can be opened and closed.
  • the thermal insulation body 12 and the thermal insulating lid 13 are made of graphite felt for example.
  • the vacuum exhaust system 3 is formed by serially connecting a dispersion pump (not shown), a mechanical booster pump (not shown) and a hydraulic rotation vacuum pump (not shown) and so on, and the vacuum exhaust system 3 is connected to the furnace barrel 11 through a valve such that they can be connected and disconnected to and from each other.
  • the heater 14 is a graphite heater or the like capable of heating the subject to be thermally treated W to a desired temperature.
  • the heater 14 is disposed at a location surrounding the subject to be thermally treated W in the thermal treatment space.
  • the furnace barrel 11 is in communication with a housing 21 which is an outer shell of the cooling chamber 2.
  • the furnace barrel 11 and the housing 21 are divided by a partition door 27 which integrally operated with the thermal insulating lid 13.
  • the housing 21 is expanded in the vertical direction.
  • a gas quenching space is formed by providing a fluid introducing system 4 in which cooling fluid (e.g., inert gas such as N2) is charged, the fan 5 for stirring and circulating the charged cooling fluid, and a heat exchanger 22 for cooling fluid which circulates in the housing 21.
  • the fluid introducing system 4 sends inert gas for cooling the subject to be thermally treated W subjected to the thermal treatment from a gas cylinder (not shown) into the housing 21.
  • a valve is provided in an intermediate portion of the fluid introducing system 4 of course.
  • the fan 5 is disposed on an upper end of the housing 21, and a drive shaft 51 of the fan5 penetrates the housing 21 and projects upward.
  • a vacuum seal 23 is provided on a portion of the fan 5 where the drive shaft 51 penetrates the housing 21.
  • a passage e.g., water cooling opening in the shaft (not shown)
  • refrigerant flows may be provided in the drive shaft 51 as means for cooling the drive shaft 51 of the fan 5.
  • An inlet/outlet 24 through which the subject to be thermally treated W is brought into and out from the housing 21 is provided at a necessary location of the housing 21.
  • the inlet/outlet 24 is tightly closed by an opening and closing door 25.
  • a lower region of the housing 21 is formed with the oil tank 26 for accumulating quenching oil as the oil quenching space, but this oil tank 26 is not absolutely necessary.
  • a thermal engine 6 which outputs driving force for driving the fan 5 is provided.
  • a transmitting mechanism 7 is interposed between an output shaft 61 of the thermal engine 6 and the drive shaft 51 of the fan 5 to connect the output shaft 61 and the drive shaft 51 with each other.
  • the thermal engine 6 burns fuel to take out mechanical energy to rotate the output shaft 61 (especially internal combustion engine), but its concrete structure is not limited. It is possible to employ various thermal engines such as diesel engine, gasoline engine and gas turbine engine as the thermal engine 6 in accordance with design specification and other circumstances. Preferably, a known revolving speed control mechanism (not shown) used for an automobile and a ship is applied to control the revolving speed of the output shaft 61.
  • the thermal engine 6 is supported by a pedestal 62 which is separated from the furnace barrel 11 and the housing 21.
  • the transmitting mechanism 7 transmits rotation driving force which is outputted from the thermal engine 6 to the drive shaft 51 of the fan 5.
  • the transmitting mechanism 7 comprises a clutch and bevel gears.
  • a clutch box 71 accommodating the clutch is disposed on a pedestal 62
  • a gear box 72 accommodating the bevel gears is disposed on the housing 21.
  • the structure of the transmitting mechanism 7 is not limited to the above-described structure.
  • the clutch and the bevel gear are not absolutely necessary. Gears other than the bevel gears may be employed of course. It is also possible to use winding transmitting means such as a belt and a chain.
  • the reason why the thermal engine 6 is supported by the pedestal 62 and the transmitting mechanism 7 is interposed between the thermal engine 6 and the fan 5 is that when the thermal engine 6 is operated, its vibration can be prevented from being transmitted to the housing 21 and the furnace barrel 11.
  • the subject to be thermally treated W sent from the inlet/outlet 24 is transferred into the thermal treatment space in the heating chamber 1 by a transfer mechanism (not shown), the thermal insulating lid 13 of the thermal insulation body 12 and the partition door 27 are closed, and the subject to be thermally treated W is heated. After the heating operation is completed, the thermal insulating lid 13 and the partition door 27 are opened, and the subject to be thermally treated W is transferred into a gas quenching space in the housing 21 by the transfer mechanism. Then, when the thermal engine 6 is started, the fan 5 is rotated.
  • cooling fluid i.e., inert gas
  • the inner chamber i.e., into the cooling chamber 2
  • the fan 5 stirs the inert gas, and the subject to be thermally treated W is rapidly cooled.
  • the internal pressure in the thermal treatment furnace is reduced to the atmospheric pressure, and the subject to be thermally treated W is transferred to a portion near the inlet/outlet 24 by the transfer mechanism.
  • the thermal treatment furnace comprises the heating chamber 1 for heating the subject to be thermally treated W, the cooling chamber 2 into which the subject to be thermally treated W heated in the heating chamber 1 is transferred, the fan 5 for stirring fluid charged into the cooling chamber 2 for cooling the subject'to be thermally treated W, the thermal engine 6 for outputting the driving force which drives the fan 5 for a period during which the subject to be thermally treated W in the cooling chamber 2, is cooled using the fan 5 and the transmitting mechanism 7 for transmitting the driving force which is outputted from the thermal engine 6 to the drive shaft 51 of the fan 5. Therefore, it becomes unnecessary to provide massive power receiving equipment and power distributing equipment inside and outside of a factory. This also reduces illogical social costs for providing infrastructure whose non-operating time is longer than operating time. This is preferable for operation in various countries where the electricity circumstances are not stable as compared with Japan.
  • the present invention is not limited to the above-described embodiment.
  • a single chamber thermal treatment furnace in which the heating chamber 1 and the cooling chamber 2 are not separated from each other as shown in Fig. 3 may be employed.
  • the drive shaft 51 of the fan 5 and the output shaft 61 of the thermal engine 6 are directed in substantially a horizontal direction, and they are substantially in parallel to each other.
  • spur gears, helical gears or herringbone gears as an element of the transmitting mechanism 7 which connects the drive shaft 51 of the fan 5 and the output shaft 61 of the thermal engine 6 to each other.
  • the drive shaft 51 of the fan 5 and the output shaft 61 of the thermal engine 6 are substantially in parallel to each other, they can directly be connected to each other without interposing the transmitting mechanism 7.
  • the present invention provides a thermal treatment furnace suitable for quenching a large subject to be thermally treated, which is provided with a thermal engine 6, and a fan 5 is driven by the thermal engine 6 to stir high pressure cooling gas for a period during which the subject to be thermally treated W is cooled.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Details (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
EP06110907A 2005-03-10 2006-03-09 Wärmebehandlungsofen Withdrawn EP1701121A3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2005068136 2005-03-10

Publications (2)

Publication Number Publication Date
EP1701121A2 true EP1701121A2 (de) 2006-09-13
EP1701121A3 EP1701121A3 (de) 2007-07-25

Family

ID=36588914

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06110907A Withdrawn EP1701121A3 (de) 2005-03-10 2006-03-09 Wärmebehandlungsofen

Country Status (2)

Country Link
EP (1) EP1701121A3 (de)
CN (1) CN1831159A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109824368A (zh) * 2018-12-14 2019-05-31 安泰天龙钨钼科技有限公司 一种低能耗热压生产氮化硼基陶瓷的方法和装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10183236A (ja) 1996-12-25 1998-07-14 Shimazu Mekutemu Kk 真空熱処理炉

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1274974A (en) * 1970-04-01 1972-05-17 Wild Barfield Ltd Improvements in heat treatment furnaces

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10183236A (ja) 1996-12-25 1998-07-14 Shimazu Mekutemu Kk 真空熱処理炉

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109824368A (zh) * 2018-12-14 2019-05-31 安泰天龙钨钼科技有限公司 一种低能耗热压生产氮化硼基陶瓷的方法和装置

Also Published As

Publication number Publication date
EP1701121A3 (de) 2007-07-25
CN1831159A (zh) 2006-09-13

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