JP2829424B2 - Continuous gas carburizing furnace - Google Patents

Continuous gas carburizing furnace

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Publication number
JP2829424B2
JP2829424B2 JP34469289A JP34469289A JP2829424B2 JP 2829424 B2 JP2829424 B2 JP 2829424B2 JP 34469289 A JP34469289 A JP 34469289A JP 34469289 A JP34469289 A JP 34469289A JP 2829424 B2 JP2829424 B2 JP 2829424B2
Authority
JP
Japan
Prior art keywords
chamber
carburizing
quenching oil
pressure
article
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 - Fee Related
Application number
JP34469289A
Other languages
Japanese (ja)
Other versions
JPH03202456A (en
Inventor
悌二 小川
俊之 村重
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.)
KOYO RINDOBAAGU KK
Original Assignee
KOYO RINDOBAAGU KK
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Publication date
Application filed by KOYO RINDOBAAGU KK filed Critical KOYO RINDOBAAGU KK
Priority to JP34469289A priority Critical patent/JP2829424B2/en
Publication of JPH03202456A publication Critical patent/JPH03202456A/en
Application granted granted Critical
Publication of JP2829424B2 publication Critical patent/JP2829424B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Description

【発明の詳細な説明】 産業上の利用分野 この発明は、連続式ガス浸炭炉に関する。Description: TECHNICAL FIELD The present invention relates to a continuous gas carburizing furnace.

この明細書において、前とは浸炭炉内で被処理物品が
搬送される方向、すなわち第1図右側を指し、後とはこ
れと反対側を指すものとする。
In this specification, the front indicates the direction in which the article to be processed is conveyed in the carburizing furnace, that is, the right side in FIG. 1, and the rear indicates the opposite side.

従来の技術と発明の課題 従来、連続式ガス浸炭炉としては、隔壁を介して入口
側ベスティブルと称する被処理物品導入室、浸炭室およ
び焼入れ油室が設けられており、隔壁に形成された開口
に中間扉が設けられ、被処理物品導入室および焼入れ油
室に、室内が正圧になった場合に内部雰囲気ガスを逃が
し、室内が負圧になった場合に吸引した大気をバーナの
燃焼に使用した後室内に供給しうるようになされた吸気
燃焼式排ガスベントが設けられているものが知られてい
る。上記従来の装置では、被処理物品導入室および焼入
れ油室の雰囲気を浸炭室内の雰囲気と同じにするため
に、浸炭室の後部の雰囲気ガスが中間扉の周縁と隔壁と
の間に形成された隙間を通って被処理物品導入室に流
れ、浸炭室の前部の雰囲気ガスが中間扉の周縁と隔壁と
の間に形成された隙間を通って焼入れ油室に流れるよう
になっている。
2. Description of the Related Art Conventionally, as a continuous gas carburizing furnace, an article introduction chamber, a carburizing chamber, and a quenching oil chamber, which are referred to as an inlet-side best, are provided through a partition, and an opening formed in the partition is provided. An intermediate door is provided in the article introduction chamber and the quenching oil chamber to allow the internal atmosphere gas to escape when the chamber is at a positive pressure, and to use the air sucked when the chamber is at a negative pressure to burn the burner. It is known to provide an intake combustion type exhaust gas vent which can be supplied into a room after use. In the above conventional apparatus, in order to make the atmosphere in the article introduction chamber and the quenching oil chamber the same as the atmosphere in the carburizing chamber, the atmosphere gas at the rear of the carburizing chamber was formed between the periphery of the intermediate door and the partition. The gas flows into the article introduction chamber through the gap, and the atmospheric gas at the front of the carburizing chamber flows into the quenching oil chamber through the gap formed between the peripheral edge of the intermediate door and the partition.

そして、被処理物品導入室に入れられている被処理物
品を浸炭室内に送るために、導入室と浸炭室との間の中
間扉を開き、その後閉じた場合や、浸炭処理の施された
被処理物品を焼入れ油室内に送るために、浸炭室と焼入
れ油室との間の中間扉を開き、その後閉じた場合に、被
処理物品導入室または焼入れ油室内の雰囲気温度が上昇
して膨張することにより被処理物品導入室または焼入れ
油室の内部圧力が高くなって正圧となり、圧力が高くな
った分だけ排ガスベントから外部へ排出される。
Then, in order to send the article to be treated placed in the article introduction chamber to the carburizing chamber, the intermediate door between the introduction chamber and the carburizing chamber is opened and then closed, or the carburized article is closed. When the intermediate door between the carburizing chamber and the quenching oil chamber is opened to send the treated article into the quenching oil chamber and then closed, the atmosphere temperature in the article introduction chamber or the quenching oil chamber rises and expands. As a result, the internal pressure of the article introduction chamber or the quenching oil chamber increases and becomes a positive pressure, and the pressure is increased and discharged to the outside from the exhaust gas vent.

しかしながら、焼入れ油室の場合には、上記のような
場合の内部圧力の上昇の度合いがかなり大きく、排ガス
ベントを通って逃げるだけではなく、中間扉と隔壁との
間の隙間を通って浸炭室内に流入し、浸炭室内の雰囲気
のカーボンポテンシャルが乱され、適正な浸炭深さの制
御ができないという問題がある。また、上記のように被
処理物品導入室の被処理物品を浸炭室内に送り込んだ後
や、浸炭室内の被処理物品を焼入れ油室に送り込んだ
後、被処理物品導入室または焼入れ油室内の雰囲気温度
が低くなると、その内部圧力が低下して負圧となる。こ
のとき、吸気燃焼式排ガスベントにより吸引した大気が
バーナの燃焼に使用された後室内に供給される以外に、
浸炭室内の雰囲気ガスが中間扉の周縁と隔壁との間を通
って被処理物品導入室または焼入れ油室内に流入し、浸
炭室内の雰囲気のカーボンポテンシャルが乱れる。しか
も、浸炭室から被処理物品導入室および焼入れ油室のう
ちのいずれか一方への雰囲気ガスの流れが生じることに
より、同他方の室内の雰囲気ガスの浸炭室への流入も起
こり、これによっても浸炭室内の雰囲気のカーボンポテ
ンシャルが乱れる。したがって、適正な浸炭深さの制御
ができないという問題がある。このようの問題は、特に
サイクルタイムが短く、雰囲気ガス量の少ない浸炭炉の
場合に深刻である。
However, in the case of the quenching oil chamber, the degree of the increase in the internal pressure in the above case is considerably large, and not only escapes through the exhaust gas vent, but also through the gap between the intermediate door and the partition wall. And the carbon potential of the atmosphere in the carburizing chamber is disturbed, which makes it impossible to properly control the carburizing depth. Also, after the article to be treated in the article introduction chamber is sent into the carburizing chamber as described above, or after the article to be treated in the carburizing chamber is sent to the quenching oil chamber, the atmosphere in the article introducing chamber or the quenching oil chamber is introduced. When the temperature decreases, the internal pressure decreases to a negative pressure. At this time, in addition to the air sucked by the intake combustion type exhaust gas vent being used to burn the burner and then being supplied to the room,
Atmosphere gas in the carburizing chamber flows between the periphery of the intermediate door and the partition and flows into the article introduction chamber or the quenching oil chamber, and the carbon potential of the atmosphere in the carburizing chamber is disturbed. Moreover, the flow of the atmospheric gas from the carburizing chamber to one of the article introduction chamber and the quenching oil chamber causes the atmospheric gas in the other chamber to flow into the carburizing chamber. The carbon potential of the atmosphere in the carburizing chamber is disturbed. Therefore, there is a problem that proper control of carburizing depth cannot be performed. Such a problem is particularly serious in a carburizing furnace having a short cycle time and a small amount of atmospheric gas.

この発明の目的は、上記問題を解決した連続式ガス浸
炭炉を提供することにある。
An object of the present invention is to provide a continuous gas carburizing furnace that solves the above problems.

課題を解決するための手段 この発明による連続式ガス浸炭炉は、 隔壁を介して被処理物品導入室、浸炭室および焼入れ
油室が設けられており、隔壁に形成された開口に中間扉
が設けられ、被処理物品導入室および焼入れ油室に、室
内が正圧になった場合に内部雰囲気ガスを逃がし、室内
が負圧になった場合に吸引した大気をバーナの燃焼に使
用した後室内に供給しうるようになされた吸気燃焼式排
ガスベントが設けられている連続式ガス浸炭炉であっ
て、 中間扉の周縁と隔壁との間がシールで密封され、被処
理物品導入室と浸炭室との間、および浸炭室と焼入れ油
室との間にそれぞれまたがって通気管が配置され、各通
気管にバルブが設けられているものである。
Means for Solving the Problems A continuous gas carburizing furnace according to the present invention is provided with an article introduction chamber, a carburizing chamber, and a quenching oil chamber through a partition, and an intermediate door is provided in an opening formed in the partition. When the inside of the room becomes a positive pressure, the internal atmosphere gas is released to the article introduction chamber and the quenching oil chamber, and when the inside of the room becomes a negative pressure, the sucked air is used for the combustion of the burner. A continuous gas carburizing furnace provided with an intake combustion exhaust gas vent that can be supplied, wherein a space between a peripheral edge of an intermediate door and a partition is sealed with a seal, and an article introduction chamber and a carburizing chamber are provided. The ventilation pipes are disposed so as to extend between the carburizing chamber and the quenching oil chamber, and a valve is provided in each ventilation pipe.

作用 被処理物品導入室および焼入れ油室の内部圧力が適正
状態であるときには、排ガスベントを通っての内部雰囲
気ガスの逃げ、および燃焼した大気の流入はなく、かつ
通気管のバルブは開かれている。被処理物品導入室およ
び焼入れ油室のうちのいずれか一方の内部圧力が正圧と
なった場合には、正圧となった室内の雰囲気ガスはこの
室に設けられた排ガスベントを通って外部に排出され、
室内の圧力が適正状態に戻される。このとき、通気管の
バルブを閉じておけば、中間扉の周縁と隔壁との間に設
けられたシールの作用と相埃って、上記両室と浸炭室と
の間の雰囲気ガスの流れが生じるのが防止される。しか
も、上記両室のうちの他方の室の内部ガスはこの室に設
けられた排ガスベントを通って外部に排出されることも
ない。したがって、浸炭炉内にはガスの流れが発生する
ことはない。
When the internal pressure of the article introduction chamber and the quenching oil chamber is in an appropriate state, there is no escape of the internal atmosphere gas through the exhaust gas vent and no inflow of the burned air, and the valve of the ventilation pipe is opened. I have. When the internal pressure of one of the article introduction chamber and the quenching oil chamber becomes positive pressure, the atmospheric gas in the chamber which has become positive pressure passes through the exhaust gas vent provided in this chamber to the outside. Is discharged to
The pressure in the room is returned to an appropriate state. At this time, if the valve of the ventilation pipe is closed, the action of the seal provided between the peripheral edge of the intermediate door and the partition wall is dusty, and the flow of the atmospheric gas between the both chambers and the carburizing chamber is reduced. It is prevented from occurring. Moreover, the internal gas in the other of the two chambers is not discharged to the outside through the exhaust gas vent provided in this chamber. Therefore, no gas flow is generated in the carburizing furnace.

逆に、上記両室のうちのいずれか一方の内部圧力が負
圧となった場合には、負圧となった室内に、排ガスベン
トにより大気が吸引され、吸引された大気がバーナで燃
焼させられた後に室内に供給されて室内の圧力が適正状
態に戻される。このとき、通気管のバルブを閉じておけ
ば、中間扉の周縁と隔壁との間に設けられたシールの作
用と相埃って、上記両室と浸炭室との間の雰囲気ガスの
流れが生じるのが防止される。しかも、上記両室のうち
の他方の室の内部ガスはこの室に設けられた排ガスベン
トを通って外部に排出さえることもない。したがって、
浸炭炉内にはガスの流れが発生することはない。
Conversely, when the internal pressure of either of the two chambers becomes negative pressure, the atmosphere is suctioned by the exhaust gas vent into the negative pressure chamber, and the sucked air is burned by the burner. After the pressure is supplied to the room, the pressure in the room is returned to an appropriate state. At this time, if the valve of the ventilation pipe is closed, the action of the seal provided between the peripheral edge of the intermediate door and the partition wall is dusty, and the flow of the atmospheric gas between the both chambers and the carburizing chamber is reduced. It is prevented from occurring. Moreover, the internal gas in the other of the two chambers is not discharged to the outside through the exhaust gas vent provided in this chamber. Therefore,
There is no gas flow in the carburizing furnace.

実 施 例 以下、この発明の1実施例を、図面を参照して説明す
る。
Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

第1図はこの発明による連続式ガス浸炭炉の構成を示
す。第1図において、連続式ガス浸炭炉(1)は、左側
から被処理物品導入室(2)、浸炭室(3)および焼入
れ油室(4)がそれぞれ隔壁(5)を介して設けられた
ものである。被処理物品導入室(2)と炉外、および焼
入れ油室(4)と炉外はそれぞれ可動扉(6)仕切られ
ている。浸炭室(3)内は、左側から予熱ゾーン(3
A)、浸炭ゾーン(3B)、拡散ゾーン(3C)および降温
・均熱ゾーン(3D)に分けられている。被処理物品導入
室(2)と浸炭室(3)の予熱ゾーン(3A)、および浸
炭室(3)の降温・均熱ゾーン(3D)と焼入れ油室
(4)にそれぞれまたがって、通気管(7)(8)が配
置され、両通気管(7)(8)にそれぞれ電磁バルブ
(9)(10)が設けられている。両電磁バルブ(9)
(10)は、それぞれ図示しない制御装置により制御され
るようになっており、被処理物品導入室(2)および焼
入れ油室(4)の内部圧力が設定圧力範囲内にあるとき
に開状態となされ、設定圧力範囲外になったときに閉状
態となされる。
FIG. 1 shows the configuration of a continuous gas carburizing furnace according to the present invention. In FIG. 1, in a continuous gas carburizing furnace (1), an article introduction chamber (2), a carburizing chamber (3), and a quenching oil chamber (4) are provided via a partition (5) from the left side. Things. A movable door (6) is partitioned between the article introduction chamber (2) and the outside of the furnace, and the quenching oil chamber (4) and the outside of the furnace. Inside the carburizing room (3), the preheating zone (3
A), carburizing zone (3B), diffusion zone (3C) and cooling / soaking zone (3D). A vent pipe extends over the preheating zone (3A) of the article introduction chamber (2) and the carburizing chamber (3), and the cooling / heating zone (3D) and the quenching oil chamber (4) of the carburizing chamber (3). (7) and (8) are arranged, and electromagnetic valves (9) and (10) are provided in both ventilation pipes (7) and (8). Double solenoid valve (9)
(10) is controlled by a control device (not shown), and is opened when the internal pressures of the article introduction chamber (2) and the quenching oil chamber (4) are within the set pressure range. The closed state is established when the pressure falls outside the set pressure range.

各隔壁(5)には開口(12)が形成され、この開口
(12)を閉鎖するように中間扉(13)が設けられてい
る。中間層(13)の周縁部と隔壁(5)との間はグラフ
ァイト製のシール(14)が密封されている。
An opening (12) is formed in each partition (5), and an intermediate door (13) is provided so as to close the opening (12). A seal (14) made of graphite is sealed between the periphery of the intermediate layer (13) and the partition (5).

被処理物品導入室(2)および焼入れ油室(4)に
は、それぞれ吸気燃焼式排ガスベント(15)および圧力
スイッチ(16)が設けられている。両室(2)に設けら
れた排ガスベント(15)は同一の構成であり、被処理物
品導入室(2)のものについて説明する。排ガスベント
(15)は、第2図および第3図に詳しく示すように、筒
状のベント本体(17)を有する。ベント本体(17)の上
端開口部(18)にはベントバルブ(19)が設けられてい
る。ベントバルブ(19)の弁棒(20)は、ベント本体
(17)の外面に固定されて開口部(18)の上方に張出し
た支持部材(21)に上下摺動自在に取付けられており、
弁棒(20)の下端には開口部(18)を密閉するための弁
体(22)が固定されている。また、弁棒(20)の上端に
は調整用錘(23)が固定され、この錘(23)と支持部材
(21)の間に調整用コイルばね(24)が取付けられてい
る。ベント本体(17)内のベントバルブ(19)のすぐ下
に、バーナ(25)が下向きに配置されている。このバー
ナ(25)はベント本体(17)の周壁に貫通状に固定され
ており、これに接続された混合気供給管(26)に電磁バ
ルブ(27)とガス・空気ミキサ(28)がバーナ(25)側
から順に設けられている。また、バーナ(25)内には点
火プラグ(29)が設けられ、点火プラグ(29)には点火
トランス(30)が接続されている。電磁バルブ(27)お
よび点火トランス(30)が圧力スイッチ(16)に接続さ
れている。
An intake combustion exhaust gas vent (15) and a pressure switch (16) are provided in the article introduction chamber (2) and the quenching oil chamber (4), respectively. Exhaust gas vents (15) provided in both chambers (2) have the same configuration, and a description will be given of the article introduction chamber (2). The exhaust gas vent (15) has a cylindrical vent body (17) as shown in detail in FIGS. A vent valve (19) is provided at an upper end opening (18) of the vent body (17). The valve stem (20) of the vent valve (19) is fixed to the outer surface of the vent body (17) and is slidably mounted on a support member (21) projecting above the opening (18).
A valve body (22) for sealing the opening (18) is fixed to a lower end of the valve stem (20). An adjustment weight (23) is fixed to the upper end of the valve stem (20), and an adjustment coil spring (24) is mounted between the weight (23) and the support member (21). The burner (25) is arranged downward just below the vent valve (19) in the vent body (17). The burner (25) is fixed to the peripheral wall of the vent body (17) in a penetrating manner. An electromagnetic valve (27) and a gas / air mixer (28) are connected to the mixture supply pipe (26) connected to the burner (25). (25) It is provided in order from the side. An ignition plug (29) is provided in the burner (25), and an ignition transformer (30) is connected to the ignition plug (29). The electromagnetic valve (27) and the ignition transformer (30) are connected to the pressure switch (16).

ベントバルブ(19)は、錘(23)とねじ(24)により
調整され、室(2)内の圧力を一定に保つ作用をする。
すなわち、運転中に室(2)内圧力が高まると、この圧
力により弁体(22)が押し上げられて、バルブ(19)が
開き、雰囲気ガスが外部に排出される。そして、室
(2)内圧力が高いほど排出されるガス量が増大し、圧
力が高くなりすぎないように作用する。一方、前述のよ
うに室(2)内圧力が負圧になったときは、圧力スイッ
チ(16)が作動し、電磁バルブ(27)を開いて、ミキサ
(28)を経由した混合気をバーナ(25)に送る。それと
同時に、圧力スイッチ(16)からの信号で点火トランス
(30)により点火プラグ(29)をスパークさせて、バー
ナ(25)に点火する。これにより、バーナ(25)で混合
気が燃焼し、バーナ(25)から出た燃焼排ガスは、その
圧力により弁体(22)を押し上げてベントバルブ(19)
を開き、大気の吸引面積を確保して吸引を容易にする。
これとともに、吸引した大気をバーナ(25)の燃焼に使
用し、使用後の大気を室(2)内に供給する。そして、
圧力を復帰したならば、圧力スイッチ(16)によりこれ
を検知し、電磁バルブ(27)を閉じるとともに、点火プ
ラグ(29)への通電を停止する。これにより、バーナ
(25)が消化し、ベントバルブ(19)が閉じる。
The vent valve (19) is adjusted by the weight (23) and the screw (24), and serves to keep the pressure in the chamber (2) constant.
That is, when the pressure in the chamber (2) increases during operation, the valve (22) is pushed up by this pressure, the valve (19) is opened, and the atmospheric gas is discharged to the outside. Then, the higher the pressure in the chamber (2), the larger the amount of gas to be discharged, and acts to prevent the pressure from becoming too high. On the other hand, when the pressure in the chamber (2) becomes negative as described above, the pressure switch (16) is operated, the electromagnetic valve (27) is opened, and the air-fuel mixture passing through the mixer (28) is burned. Send to (25). At the same time, the ignition plug (29) is sparked by the ignition transformer (30) based on the signal from the pressure switch (16), and the burner (25) is ignited. As a result, the air-fuel mixture burns in the burner (25), and the combustion exhaust gas discharged from the burner (25) pushes up the valve body (22) by the pressure to cause the vent valve (19).
Is opened to secure the suction area of the atmosphere to facilitate suction.
At the same time, the suctioned air is used for burning the burner (25), and the used air is supplied into the chamber (2). And
When the pressure is restored, this is detected by the pressure switch (16), the electromagnetic valve (27) is closed, and the power supply to the spark plug (29) is stopped. Thereby, the burner (25) is digested and the vent valve (19) is closed.

このような構成において、導入室(2)を経て浸炭室
(3)内に入った被処理物品は、搬送装置(31)によっ
て、浸炭室(3)内を昇温ゾーン(3A)から降温・均熱
ゾーン(3D)まで搬送され、その間に昇温ゾーン(3A)
で所定温度まで加熱され、浸炭ゾーン(3B)で浸炭処理
が施され、拡散ゾーン(3C)で浸炭ゾーン(3B)での温
度よりも低い温度で拡散処理が施され、降温・均熱ゾー
ン(3D)で均熱処理が施される。その後、焼入れ油室
(4)で焼入れ処理が施される。
In such a configuration, the article to be treated, which has entered the carburizing chamber (3) through the introduction chamber (2), is cooled down in the carburizing chamber (3) from the heating zone (3A) by the transfer device (31). Conveyed to soaking zone (3D), meanwhile heating zone (3A)
Is heated to a predetermined temperature, carburizing is performed in the carburizing zone (3B), diffusion is performed in the diffusion zone (3C) at a temperature lower than the temperature in the carburizing zone (3B), and the cooling and soaking zone ( In 3D), a soaking treatment is performed. Thereafter, a quenching treatment is performed in a quenching oil chamber (4).

被処理物品導入室(2)および焼入れ油室(4)の内
部圧力が適正状態であるときには、排ガスベント(15)
を通っての内部雰囲気ガスの逃げ、および燃焼した大気
の流入はなく、かつ通気管(7)(8)の電磁バルブ
(9)(10)は開かれている。
When the internal pressure of the article introduction chamber (2) and the quenching oil chamber (4) is in an appropriate state, the exhaust gas vent (15)
There is no escape of the internal atmosphere gas through and no inflow of the burned air, and the solenoid valves (9) (10) of the vent pipes (7) (8) are open.

被処理物品導入室(2)に入れられている被処理物品
を浸炭室(3)内に送るために、導入室(2)と浸炭室
(3)との間の中間扉(13)を開き、その後閉じた場合
や、浸炭処理の施された被処理物品を焼入れ油室(4)
内に送るために、浸炭室(3)と焼入れ油室(4)との
間の中間扉(13)を開き、その後閉じた場合に、これら
の室(2)(4)内の雰囲気温度が上昇して膨張するこ
とにより被処理物品導入室(2)または焼入れ油室
(4)の内部圧力が高くなって正圧となる。そして、雰
囲気ガスが、内部圧力が高くなった分だけ排ガスベント
(15)から外部へ排出され、室(2)(4)内の圧力が
適正状態に戻される。このとき、通気管(7)(8)の
電磁バルブ(9)(10)は閉状態となり、中間扉(13)
の周縁と隔壁(5)との間に設けられたシール(14)の
作用と相埃って、被処理物品導入室(2)または焼入れ
油室(4)と浸炭室(3)との間に雰囲気ガスの流れが
生じるのが防止される。しかも、被処理物品導入室
(2)および焼入れ油室(4)のうちの正圧となってい
ない他方の室の内部ガスはこの室に設けられた排ガスベ
ント(15)を通って外部に排出されることもない。した
がって、浸炭室(3)内にはガスの流れが発生すること
はない。
Open the intermediate door (13) between the introduction chamber (2) and the carburizing chamber (3) to send the article to be treated placed in the introduction chamber (2) into the carburizing chamber (3). The article to be treated which has been closed or carburized afterwards is quenched in the oil chamber (4).
When the intermediate door (13) between the carburizing chamber (3) and the quenching oil chamber (4) is opened and then closed, the atmospheric temperature in these chambers (2) and (4) is reduced. As the pressure rises and expands, the internal pressure of the article introduction chamber (2) or the quenching oil chamber (4) increases and becomes positive. Then, the atmospheric gas is discharged from the exhaust gas vent (15) to the outside by an amount corresponding to the increased internal pressure, and the pressure in the chambers (2) and (4) is returned to an appropriate state. At this time, the electromagnetic valves (9) and (10) of the ventilation pipes (7) and (8) are closed, and the intermediate door (13)
The seal (14) provided between the peripheral edge of the partition and the partition (5) is dusty, so that the article-to-be-treated chamber (2) or the quenching oil chamber (4) and the carburizing chamber (3) are dusted. The flow of the atmospheric gas is prevented from occurring. In addition, the internal gas of the other non-positive pressure chamber of the article introduction chamber (2) and the quenching oil chamber (4) is discharged to the outside through an exhaust gas vent (15) provided in this chamber. It will not be done. Therefore, no gas flow is generated in the carburizing chamber (3).

逆に、被処理物品導入室(2)の被処理物品を浸炭室
(3)内に送り込んだ後や、浸た室(3)内の被処理物
品を焼入れ油室(4)に送り込んだ後、室(2)(4)
内の雰囲気温度が低くなると、その内部圧力が低下して
負圧となる。このとき、負圧となった室内に、上述のよ
うに、吸気燃焼式排ガスベント(15)により大気が吸引
され、吸引された大気がバーナ(25)で燃焼させられた
後に室内に供給されて室内の圧力が適正状態に戻され
る。このとき、通気管(7)(8)の電磁バルブ(9)
(10)は閉状態となり、中間層(13)の周縁と隔壁
(5)との間に設けられたシール(14)の作用と相埃っ
て、負圧になった室と浸炭室(3)との間に雰囲気ガス
の流れが生じるのが防止される。しかも、負圧になって
いない室の内部ガスはこの室に設けられた排ガスベント
(15)を通って外部に排出されることもない。したがっ
て、浸炭室(3)内にはガスの流れが発生することはな
い。
Conversely, after the article to be treated in the article introduction chamber (2) is sent into the carburizing chamber (3) or after the article to be treated in the soaked chamber (3) is sent to the quenching oil chamber (4) , Room (2) (4)
When the temperature of the atmosphere in the inside is reduced, the internal pressure is reduced to a negative pressure. At this time, as described above, the air is sucked into the negative pressure room by the intake combustion exhaust gas vent (15), and the sucked air is burned by the burner (25) and then supplied to the room. The pressure in the room is returned to an appropriate state. At this time, the electromagnetic valves (9) of the ventilation pipes (7) (8)
(10) is in a closed state, and the action of the seal (14) provided between the peripheral edge of the intermediate layer (13) and the partition (5) is dusty, so that a negative pressure chamber and a carburizing chamber (3) are formed. ) Is prevented from flowing. In addition, the gas inside the chamber that is not at a negative pressure is not discharged outside through the exhaust gas vent (15) provided in this chamber. Therefore, no gas flow is generated in the carburizing chamber (3).

上述のように、被処理物品導入室(2)および焼入れ
油室(4)のうちのいずれか一方の内部圧力が正圧とな
ったり、負圧になったりした場合にも浸炭室(3)内に
雰囲気ガスの流れは発生せず、カーボンポテンシャルが
乱れることはない。したがって、適正な浸炭深さの制御
が行われる。
As described above, even when the internal pressure of one of the article introduction chamber (2) and the quenching oil chamber (4) becomes a positive pressure or a negative pressure, the carburizing chamber (3). There is no flow of atmospheric gas inside, and the carbon potential is not disturbed. Therefore, appropriate control of the carburizing depth is performed.

そして、被処理物品導入室(2)および焼入れ油室
(4)のうちのいずれか一方の内部圧力が正圧になった
り、負圧になったりした場合における浸炭室(3)内の
O2の変化を、ジルコニア式O2センサを用いて測定したと
ころ、センサからの出力電圧は3〜5mV程度であった。
比較のために、従来の連続式ガス浸炭炉における浸炭室
内のO2の変化を、ジルコニア式O2センサを用いて測定し
たところ、センサからの出力電圧は30mV程度であった。
When the internal pressure of one of the article introduction chamber (2) and the quenching oil chamber (4) becomes positive pressure or negative pressure, the inside of the carburizing chamber (3) is reduced.
The change in the O 2, was measured using a zirconia O 2 sensor, the output voltage from the sensor was about 3~5MV.
For comparison, the change in O 2 in the carburizing chamber in the conventional continuous gas carburizing furnace was measured using a zirconia O 2 sensor, and the output voltage from the sensor was about 30 mV.

発明の効果 この発明は連続式ガス浸炭炉によれば、上述のように
して、浸炭室内において雰囲気ガスの流れが生じるのを
防止できる。したがって、浸炭室内のカーボンポテンシ
ャルに乱れは生じず、適正な浸炭深さが得られる。
According to the present invention, according to the continuous gas carburizing furnace, it is possible to prevent the flow of the atmospheric gas in the carburizing chamber as described above. Therefore, the carbon potential in the carburizing chamber is not disturbed, and an appropriate carburizing depth can be obtained.

【図面の簡単な説明】[Brief description of the drawings]

第1図はこの発明による連続式ガス浸炭炉の実施例を示
す全体構成図、第2図は吸気燃焼式排ガスベントの垂直
断面図、第3図は第2図の排ガスベントの上部を拡大し
て示す垂直断面図である。 (1)……連続式ガス浸炭炉、(2)……被処理物品導
入室、(3)……浸炭室、(4)……焼入れ油室、
(5)……隔壁、(7)(8)……通気管、(9)(1
0)……電磁バルブ、(12)……開口、(13)……中間
扉、(14)……シール、(15)……吸気燃焼式排ガスベ
ント、(25)……バーナ。
FIG. 1 is an overall structural view showing an embodiment of a continuous gas carburizing furnace according to the present invention, FIG. 2 is a vertical sectional view of an intake combustion type exhaust gas vent, and FIG. 3 is an enlarged view of the upper part of the exhaust gas vent of FIG. FIG. (1) ... continuous gas carburizing furnace, (2) ... article introduction chamber, (3) ... carburizing chamber, (4) ... quenching oil chamber,
(5) ... partition wall, (7) (8) ... vent pipe, (9) (1
0) Electromagnetic valve, (12) Opening, (13) Intermediate door, (14) Seal, (15) Inlet combustion exhaust gas vent, (25) Burner.

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】隔壁を介して被処理物品導入室、浸炭室お
よび焼入れ油室が設けられており、隔壁に形成された開
口に中間扉が設けられ、被処理物品導入室および焼入れ
油室に、室内が正圧になった場合に内部雰囲気ガスを逃
がし、室内が負圧になった場合に吸引した大気をバーナ
の燃焼に使用した後室内に供給しうるようになされた吸
気燃焼式排ガスベントが設けられている連続式ガス浸炭
炉であって、 中間扉の周縁と隔壁との間がシールで密封され、被処理
物品導入室と浸炭室との間、および浸炭室と焼入れ油室
との間にそれぞれまたがって通気管が配置され、各通気
管にバルブが設けられている連続式ガス浸炭炉。
1. An article introduction chamber, a carburizing chamber, and a quenching oil chamber are provided through a partition, and an intermediate door is provided at an opening formed in the partition, and an intermediate door is provided in the article introduction chamber and the quenching oil chamber. An intake-combustion exhaust gas vent that allows the internal atmosphere gas to escape when the interior of the chamber has a positive pressure, and can be supplied to the interior after using the air sucked when the interior of the chamber has a negative pressure to burn the burner. Provided between the carburizing chamber and the quenching oil chamber, between the carburizing chamber and the article introduction chamber to be treated, and a seal between the periphery of the intermediate door and the partition wall is provided with a seal. A continuous gas carburizing furnace in which ventilation pipes are arranged so as to straddle each, and a valve is provided in each ventilation pipe.
JP34469289A 1989-12-28 1989-12-28 Continuous gas carburizing furnace Expired - Fee Related JP2829424B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP34469289A JP2829424B2 (en) 1989-12-28 1989-12-28 Continuous gas carburizing furnace

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP34469289A JP2829424B2 (en) 1989-12-28 1989-12-28 Continuous gas carburizing furnace

Publications (2)

Publication Number Publication Date
JPH03202456A JPH03202456A (en) 1991-09-04
JP2829424B2 true JP2829424B2 (en) 1998-11-25

Family

ID=18371241

Family Applications (1)

Application Number Title Priority Date Filing Date
JP34469289A Expired - Fee Related JP2829424B2 (en) 1989-12-28 1989-12-28 Continuous gas carburizing furnace

Country Status (1)

Country Link
JP (1) JP2829424B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4544537B2 (en) * 2004-08-23 2010-09-15 光洋サーモシステム株式会社 Carburizing apparatus and carburizing method

Also Published As

Publication number Publication date
JPH03202456A (en) 1991-09-04

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