JPH07133902A - Gas vertical flow type exhaust gas boiler - Google Patents
Gas vertical flow type exhaust gas boilerInfo
- Publication number
- JPH07133902A JPH07133902A JP27949293A JP27949293A JPH07133902A JP H07133902 A JPH07133902 A JP H07133902A JP 27949293 A JP27949293 A JP 27949293A JP 27949293 A JP27949293 A JP 27949293A JP H07133902 A JPH07133902 A JP H07133902A
- Authority
- JP
- Japan
- Prior art keywords
- heat transfer
- header
- exhaust gas
- gas boiler
- boiler
- 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.)
- Granted
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- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、伝熱管と管寄せとの接
続方式を改良したガス竪流れ型排ガスボイラに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas vertical flow type exhaust gas boiler having an improved connection method between a heat transfer tube and a header.
【０００２】[0002]
【従来の技術】従来のガス竪流れ型排ガスボイラ１例
を、図４及び図５によって説明する。図４に示すよう
に、下方から上方へ向ってガスが竪流れする排ガスボイ
ラ１は、その全体の荷重伝達のために、排ガスボイラ１
内に設置される伝熱管群２と、その荷重を吊り下げ構造
として支持するためにガスダクト内に設置されたホット
ビーム１９と、このホットビーム１９からの荷重を地面
に伝達させるための支持架構１３、１６を備えている。
また、排ガスボイラ１は、前記の部材の他に、伝熱管群
２の管端部にガス流れの両側に設けられた対をなすガス
案内板６およびその外側に対をなす管寄せ収納部３、さ
らに燃焼排ガスを完全にシールするためのケーシング部
２０を備えている。排ガスボイラ１の高温ガス入口部
は、入口高温ダクト１４と入口プレナム１５により構成
され、排ガスボイラ１の出口部は低温ダクト１１により
構成されている。2. Description of the Related Art An example of a conventional gas vertical flow type exhaust gas boiler will be described with reference to FIGS. As shown in FIG. 4, the exhaust gas boiler 1 in which the gas vertically flows from the lower side to the upper side is the exhaust gas boiler 1 in order to transmit the entire load.
A group of heat transfer tubes 2 installed therein, a hot beam 19 installed in a gas duct for supporting the load as a suspension structure, and a support frame 13 for transmitting the load from the hot beam 19 to the ground. , 16 are provided.
In addition to the above-mentioned members, the exhaust gas boiler 1 includes a pair of gas guide plates 6 provided on both sides of the gas flow at the tube end portion of the heat transfer tube group 2 and a pair of the pipe close accommodating portions 3 outside thereof. Further, a casing portion 20 for completely sealing the combustion exhaust gas is provided. The hot gas inlet portion of the exhaust gas boiler 1 is constituted by an inlet high temperature duct 14 and an inlet plenum 15, and the outlet portion of the exhaust gas boiler 1 is constituted by a low temperature duct 11.
【０００３】図示される排ガスボイラ１は二段圧力式で
あり、高圧蒸気発生系に装備される高圧蒸気ドラム１７
は、ボイラ支持架構１６の上に設けられた支持架台１８
の上に設置されている。一方、低圧蒸気発生系に装備さ
れる低圧蒸気ドラム１０は、ボイラ支持架構１３の上に
設けられた支持架台１２の上に設置されている。The illustrated exhaust gas boiler 1 is of a two-stage pressure type, and has a high-pressure steam drum 17 installed in a high-pressure steam generation system.
Is a support frame 18 provided on the boiler support frame 16.
It is installed on top of. On the other hand, the low-pressure steam drum 10 equipped in the low-pressure steam generation system is installed on a support frame 12 provided on a boiler support frame 13.
【０００４】図５に示すように、排ガスボイラ１内のガ
ス流れの側部の管寄せ収納部３内には、互いに間隔をお
いてそれぞれ１個の下方の入口管寄せ４と１個の上方の
出口管寄せ５が配置され、入口管寄せ４と出口管寄せ５
に伝熱管群２を形成する複数の伝熱管２ａの両端部が接
続され、伝熱管群２は、ガス流れを横切るように水平に
配置され、かつ、ガス流れの両側においてＵ字形に湾曲
されており、排ガスボイラ１内において伝熱面を構成し
ている。As shown in FIG. 5, one lower inlet header 4 and one upper inlet spacer 4 are arranged at intervals in the header portion 3 in the header portion 3 on the side of the gas flow in the exhaust gas boiler 1. The outlet header 5 is arranged, and the inlet header 4 and the outlet header 5 are arranged.
Both ends of a plurality of heat transfer tubes 2a forming the heat transfer tube group 2 are connected to each other, the heat transfer tube group 2 is horizontally arranged so as to cross the gas flow, and is curved in a U shape on both sides of the gas flow. And constitutes a heat transfer surface in the exhaust gas boiler 1.
【０００５】伝熱管群２は、管内流量を確保するため
に、通常水平方向に列をなし、かつ、上下方向に間隔を
おいて配置された４列又はそれ以上の列をなす複数の伝
熱管２ａで構成され、この上下方向に４列又はそれ以上
の列をなす伝熱管２ａの両端部は、図５に示すように、
入口管寄せ４と出口管寄せ５に溶接によって接続されて
いる（本明細書ではこれを４本取り又はそれ以上の本数
取りという）。The heat transfer tube group 2 is usually composed of a plurality of heat transfer tubes which are arranged in a horizontal direction and have four or more rows arranged at intervals in the vertical direction in order to secure a flow rate in the tube. As shown in FIG. 5, both ends of the heat transfer tube 2a, which is composed of 2a and has four rows or more in the vertical direction, are
It is connected to the inlet header 4 and the outlet header 5 by welding (this is referred to as a four-piece or more-piece arrangement in this specification).
【０００６】[0006]
【課題を解決するための手段】前記従来のガス竪流れ型
排ガスボイラにおける伝熱管の管寄せに接続される位置
を、図６に示す。図６は、４本取りの伝熱管群２におい
て、入口管寄せ４及び出口管寄せ５に接続される伝熱管
２ａの部分を黒丸で示し、それ以外の伝熱管２ａの部分
を白丸で示している。FIG. 6 shows a position of the conventional gas vertical flow type exhaust gas boiler which is connected to a header of a heat transfer tube. In FIG. 6, in the four heat transfer tube group 2, the portions of the heat transfer tubes 2a connected to the inlet header 4 and the outlet header 5 are indicated by black circles, and the other portions of the heat transfer tubes 2a are indicated by white circles. There is.
【０００７】図６に示すように、伝熱管２ａを入口管寄
せ４と出口管寄せ５に溶接して接続する部分では、黒丸
で示す隣接する複数の伝熱管２ａがそれぞれ入口管寄せ
４又は出口管寄せ５に接続されているために、接続され
る伝熱管２ａの部分の間のピッチが小さい。従って、伝
熱管２ａを前記管寄せ４、５へ溶接するために広い作業
スペースが必要となり、図４及び図５中に示す管寄せ収
納部３の水平方向の寸法Ｌ及び入口管寄せ４と出口管寄
せ５との間の上下方向の寸法Ｈ（高さ方向の寸法）が大
きくなり、排ガスボイラ全体を大型化する要因の一つと
なっている。特に、伝熱管の本取り数の多い伝熱管群
（蒸発器系統等）においては、この傾向が顕著である。As shown in FIG. 6, at a portion where the heat transfer pipe 2a is connected to the inlet pipe header 4 and the outlet pipe header 5 by welding, a plurality of adjacent heat transfer pipes 2a indicated by black circles are respectively provided at the inlet pipe header 4 or the outlet pipe. Since the pipes 5 are connected to the header 5, the pitch between the connected heat transfer pipes 2a is small. Therefore, a large work space is required to weld the heat transfer tube 2a to the headers 4 and 5, and the horizontal dimension L of the header storage part 3 and the inlet header 4 and the outlet shown in FIGS. The vertical dimension H (dimension in the height direction) between the header 5 and the pipe header 5 is increased, which is one of the factors that increase the size of the entire exhaust gas boiler. In particular, this tendency is remarkable in a heat transfer tube group (evaporator system or the like) in which a large number of heat transfer tubes are taken.
【０００８】本発明は、以上の問題点を解決することが
できるガス竪流れ型排ガスボイラを提供しようとするも
のである。The present invention intends to provide a gas vertical flow type exhaust gas boiler which can solve the above problems.
【０００９】[0009]
【課題を解決するための手段】本発明は、上下に間隔を
おいて配置された入口管寄せと出口管寄せとに両端部が
接続されガス流れを横切って配置された複数の伝熱管に
よって構成される伝熱管群を備えたガス竪流れ型排ガス
ボイラにおいて、入口管寄せと出口管寄せのそれぞれに
伝熱管を２本取りに接続したことを特徴とする。SUMMARY OF THE INVENTION The present invention comprises a plurality of heat transfer tubes having both ends connected to an inlet header and an outlet header which are vertically spaced from each other and arranged across a gas flow. In a gas vertical flow type exhaust gas boiler equipped with a heat transfer tube group, characterized in that two heat transfer tubes are connected to each of the inlet pipe outlet and the outlet pipe header.
【００１０】[0010]
【作用】本発明では、入口管寄せと出口管寄せに伝熱管
をそれぞれ２本取りの方式で接続しているために、前記
入口管寄せと出口管寄せに接続されるこれらの伝熱管の
部分の間のピッチが大きくなり、伝熱管の前記管寄せと
の接続部において、溶接等の接続作業に要するスペース
を小さくすることができる。また、２本取りとすること
によって管寄せの寸法も小さくてすむ。従って、排ガス
ボイラ全体を小形化することが可能になる。In the present invention, since the heat transfer tubes are connected to the inlet header and the outlet header in a two-piece manner, the portions of the heat exchanger tubes connected to the inlet header and the outlet header are connected. The pitch between them becomes large, and the space required for connection work such as welding can be made small at the connection portion of the heat transfer tube with the above-mentioned header. Further, by adopting two pieces, it is possible to reduce the size of the header. Therefore, the entire exhaust gas boiler can be downsized.
【００１１】なお、本発明では伝熱管の本取りを２本と
少なくしているので、伝熱管１本あたりが受持つ管内流
量が増加し、管内圧力損失が許容値に納まらなくなるお
それがあるが、伝熱管１本あたりの管内通過流量を計画
条件にそろえるように、２本取りの管寄せ数を調整する
ことによって、この問題は容易に解決され、排ガスボイ
ラの性能に悪影響を及ぼすことはない。In the present invention, since the number of main heat transfer tubes is reduced to two, the flow rate in each heat transfer tube increases, and the pressure loss in the tube may not reach the allowable value. , This problem can be easily solved by adjusting the number of pipe arrangements of two pipes so that the flow rate through the pipes per heat transfer pipe is adjusted to the planned condition, and the performance of the exhaust gas boiler is not adversely affected. .
【００１２】[0012]
【実施例】本発明の第１の実施例を、図１及び図２によ
って説明する。本実施例は、図４ないし図６に示される
型式のガス竪流れ型排ガスボイラにおいて、入口管寄せ
４、出口管寄せ５及び伝熱管群２を次のように構成した
ものである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. In this embodiment, in the gas vertical flow type exhaust gas boiler of the type shown in FIGS. 4 to 6, the inlet header 4, the outlet header 5, and the heat transfer tube group 2 are configured as follows.
【００１３】伝熱管群２は、水平方向に列をなし、か
つ、上下方向に間隔をおいて２列をなして配置された複
数の伝熱管２ａによって構成されている。排ガスボイラ
１内を矢印に示すように上下方向に竪方向に流れるガス
の流れの両側には、対をなすガス案内板６が設けられ、
その外側には対をなす管寄せ収納部３が設けられてい
る。The heat transfer tube group 2 is composed of a plurality of heat transfer tubes 2a arranged in a row in the horizontal direction and arranged in two rows at intervals in the up and down direction. Gas guide plates 6 forming a pair are provided on both sides of the flow of gas flowing vertically in the exhaust gas boiler 1 as shown by the arrow.
On the outer side thereof, a pair of pipe drawing storage portions 3 is provided.
【００１４】各管寄せ収納部３内には、間隔をおいて下
方の入口管寄せ４と上方の出口管寄せ５が配置されてお
り、前記上下方向に２列をなす伝熱管２ａの両端は、そ
れぞれ入口管寄せ４と出口管寄せ５に溶接によって接続
（２本取り）されている。伝熱管群２は、排ガスボイラ
１内のガス流れを横切るように水平に配置されており、
かつ、ガス流れの両側の管寄せ収納部３内でＵ字形に湾
曲されていて、排ガスボイラ１内において伝熱面を形成
している。ガス流れの各側部にある入口管寄せ４と出口
管寄せ５との間に前記のように伝熱管群２が形成されて
いるので、排ガスボイラ１は、図１に示すように、左右
の２組の入口管寄せ４、出口管寄せ５及び伝熱管群２を
具備している。また、図１に示すように、一方の組の上
下に隣接する伝熱管２ａ、２ａの間に、他方の組の伝熱
管２ａが配置されるようになっている。A lower inlet pipe header 4 and an upper outlet pipe header 5 are arranged at intervals in each of the pipe header storage portions 3, and both ends of the heat transfer pipes 2a forming two rows in the vertical direction are arranged. , Are respectively connected to the inlet header 4 and the outlet header 5 by welding (two pieces are taken). The heat transfer tube group 2 is horizontally arranged so as to cross the gas flow in the exhaust gas boiler 1,
In addition, it is curved in a U-shape in the pipe-placing storage portions 3 on both sides of the gas flow, and forms a heat transfer surface in the exhaust gas boiler 1. Since the heat transfer tube group 2 is formed between the inlet pipe header 4 and the outlet pipe header 5 on each side of the gas flow as described above, the exhaust gas boiler 1 is provided with Two sets of inlet pipe header 4, outlet pipe header 5, and heat transfer tube group 2 are provided. Further, as shown in FIG. 1, the heat transfer tubes 2a of the other set are arranged between the heat transfer tubes 2a of the one set which are vertically adjacent to each other.
【００１５】図２に、図１の左側の入口管寄せ４と出口
管寄せ５とに接続される伝熱管群２の部分を示す。図中
黒丸は、一方の組の前記管寄せ４、５に接続される部分
にある伝熱管２ａを示し、白丸は、一方の組の伝熱管２
ａのその他の部分と他の組の伝熱管２ａを示している。FIG. 2 shows a portion of the heat transfer tube group 2 connected to the inlet pipe header 4 and the outlet pipe header 5 on the left side of FIG. In the figure, the black circles indicate the heat transfer tubes 2a in the part connected to the one of the groups of the headers 4, 5, and the white circles indicate the one set of the heat transfer tubes 2.
The other part of a and the heat transfer tube 2a of another set are shown.
【００１６】図２に示すように、入口管寄せ４と出口管
寄せ５は上下に２列をなす複数の伝熱管２ａが接続され
る２本取りの接続方式を採用しており、かつ、黒丸で示
される一方の組の伝熱管２ａの管寄せ４、５に接続され
る部分の隣接するものの間には、他方の組の伝熱管２ａ
が配置されているために、管寄せ４、５に接続される伝
熱管２ａの間の間隔が広がる。As shown in FIG. 2, the inlet pipe header 4 and the outlet pipe header 5 adopt a two-piece connection system in which a plurality of heat transfer pipes 2a arranged in two rows are connected, and a black circle. The heat transfer tubes 2a of the other set are provided between adjacent parts of the parts connected to the headers 4 and 5 of the heat transfer tubes 2a of the one set.
Are arranged, the space between the heat transfer tubes 2a connected to the headers 4 and 5 is widened.
【００１７】従って、入口管寄せ４と出口管寄せ５にお
いて、伝熱管２ａの溶接による接続作業を容易に行うこ
とができ、管寄せ収納部３の水平方向の寸法Ｌと両管寄
せ間の上下方向の寸法Ｈを小さくし、かつ、管寄せ４、
５の寸法も小さくすることができる。これによって、本
実施例では、排ガスボイラ１全体を小形化することが可
能である。Therefore, at the inlet header 4 and the outlet header 5, the connection work by welding the heat transfer tube 2a can be easily performed, and the horizontal dimension L of the header holder 3 and the vertical distance between the headers. Direction dimension H is reduced, and
The size of 5 can also be reduced. As a result, in the present embodiment, the exhaust gas boiler 1 can be downsized as a whole.
【００１８】また、本実施例では、伝熱管を２本取りで
接続する各管寄せ４、５においては、接続される伝熱管
２ａの数が減少するが、管寄せ４、５と伝熱管群２を２
組備えているために、各伝熱管２ａ１本当りが受持つ管
内流量を計画条件内にすることが可能であり、管内圧力
損失を抑えて所定の性能を実現することができる。Further, in this embodiment, the number of heat transfer tubes 2a to be connected is reduced in each of the heat transfer tubes 4 and 5 in which two heat transfer tubes are connected, but the heat transfer tubes 4 and 5 and the heat transfer tube group are connected. Two to two
Since the heat transfer tubes 2a are provided in pairs, it is possible to keep the in-tube flow rate per heat transfer tube 2a within the planned condition, and suppress the in-tube pressure loss to achieve a predetermined performance.
【００１９】本発明の第２の実施例を、図３によって説
明する。本実施例は、従来のガス竪流れ型排ガスボイラ
の８本取りの管寄せの配置に対応するものであり、ガス
流れの両側の各々に、それぞれ２個ずつ下方に位置して
上下に位置をずらせた入口管寄せ４と上方に位置して上
下に位置をずらせた出口管寄せ５を配置し、かつ、ガス
流れの両側の対応するもの同士が同じ高さにあるように
配置し、入口管寄せ４と出口管寄せ５の各々に上下に２
列をなす複数の伝熱管２ａを２本取りの方式で接続した
ものである。従って、本実施例では、図３の左側と右側
にそれぞれ２組、計４組の入口管寄せ４、出口管寄せ５
及び伝熱管群２の組が構成されており、前記第１の実施
例におけると同様に、対応する左右の組の一方の上下に
隣接する伝熱管２ａの間に他方の組の伝熱管２ａが配置
されている。また、本実施例では、図３に示すように、
伝熱管２ａはガス流れの他側の管寄せ収納部３内でＵ字
形に１回湾曲しており、かつ、ガス流れの各側におい
て、最下位の入口管寄せ４に１端部が接続された伝熱管
２ａの他端部は最上位の出口管寄せ５に接続されてお
り、また、上下方向の中間の入口管寄せ４に１端部が接
続された伝熱管２ａの他端部は上下方向中間の出口管寄
せ５に接続されている。The second embodiment of the present invention will be described with reference to FIG. The present embodiment corresponds to an arrangement of eight pipes in a conventional vertical gas flow type exhaust gas boiler, in which two on each side of the gas flow are positioned downward by two, respectively. The inlet pipe header 4 and the outlet pipe header 5 which are positioned above and above and offset from each other are arranged, and the corresponding ones on both sides of the gas flow are arranged at the same height. 2 up and down on each of the draw 4 and the exit pipe draw 5
A plurality of heat transfer tubes 2a forming a line are connected in a two-piece system. Therefore, in this embodiment, two sets are provided on each of the left side and the right side of FIG.
And a group of heat transfer tube groups 2 is configured, and as in the first embodiment, the heat transfer tubes 2a of the other set are provided between the heat transfer tubes 2a that are vertically adjacent to each other of the corresponding left and right groups. It is arranged. Further, in this embodiment, as shown in FIG.
The heat transfer tube 2a is curved once in a U-shape in the header housing 3 on the other side of the gas flow, and one end is connected to the lowest inlet header 4 on each side of the gas flow. The other end of the heat transfer pipe 2a is connected to the uppermost outlet header 5, and the other end of the heat transfer pipe 2a whose one end is connected to the middle vertical inlet header 4 is It is connected to the outlet header 5 in the middle of the direction.
【００２０】本実施例においても、前記第１の実施例と
同様に寸法Ｌ及びＨを小さくして、排ガスボイラ１の全
体を小形化することができる。Also in this embodiment, as in the first embodiment, the dimensions L and H can be reduced, and the exhaust gas boiler 1 can be downsized as a whole.
【００２１】[0021]
【発明の効果】本発明は、ガス竪流れ型排ガスボイラに
おいて、入口管寄せと出口管寄せに伝熱管を２本取りに
接続しているために、従来のガス竪流れ型排ガスボイラ
と比較して排ガスボイラの管寄せ収納部の水平方向の寸
法と入口管寄せと出口管寄せ間の上下方向の寸法を減小
させることができ、排ガスボイラ全体をコンパクトにす
ることができる。INDUSTRIAL APPLICABILITY The present invention is, in a gas vertical flow type exhaust gas boiler, compared with a conventional gas vertical flow type exhaust gas boiler because two heat transfer tubes are connected to the inlet pipe header and the outlet pipe header. As a result, the horizontal dimension of the exhaust gas boiler side-by-side accommodating portion and the vertical size between the inlet side and outlet side can be reduced, and the exhaust gas boiler as a whole can be made compact.
【図１】本発明の第１の実施例の要部の立面図である。FIG. 1 is an elevational view of an essential part of a first embodiment of the present invention.
【図２】同第１の実施例の管寄せへの接続部における伝
熱管の配置を示す説明図である。FIG. 2 is an explanatory view showing an arrangement of heat transfer tubes in a connecting portion for connecting a pipe according to the first embodiment.
【図３】本発明の第２の実施例の要部の立面図である。FIG. 3 is an elevational view of an essential part of a second embodiment of the present invention.
【図４】従来のガス竪流れ型排ガスボイラの１例の構成
を示す縦断面図である。FIG. 4 is a vertical cross-sectional view showing the configuration of an example of a conventional gas vertical flow type exhaust gas boiler.
【図５】同従来のガス竪流れ型排ガスボイラの要部の立
面図である。FIG. 5 is an elevational view of a main part of the conventional gas vertical flow type exhaust gas boiler.
【図６】同従来のガス竪流れ型排ガスボイラの管寄せへ
の接続部における伝熱管の配置を示す説明図である。FIG. 6 is an explanatory view showing an arrangement of heat transfer tubes in a connection portion of the conventional gas vertical flow type exhaust gas boiler to the header.
１ 排ガスボイラ ２ 伝熱管群 ２ａ 伝熱管 ３ 管寄せ収納部 ４ 入口管寄せ ５ 出口管寄せ ６ ガス案内板 1 Exhaust Gas Boiler 2 Heat Transfer Tube Group 2a Heat Transfer Tube 3 Side-by-Side Storage Section 4 Inlet Side-by-Side 5 Outlet Side-Side 6 Gas Guide Plate
Claims (1)
せと出口管寄せに両端部が接続されガス流れを横切って
配置された複数の伝熱管によって構成される伝熱管群を
備えたガス竪流れ型排ガスボイラにおいて、入口管寄せ
と出口管寄せのそれぞれに伝熱管を２本取りに接続した
ことを特徴とするガス竪流れ型排ガスボイラ。1. A gas comprising a heat transfer tube group composed of a plurality of heat transfer tubes, which are connected at both ends to an inlet pipe outlet and an outlet pipe header which are vertically spaced from each other and which are arranged across a gas flow. In the vertical flow type exhaust gas boiler, a gas vertical flow type exhaust gas boiler is characterized in that two heat transfer pipes are connected to each of the inlet pipe header and the outlet pipe header.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27949293A JP3621711B2 (en) | 1993-11-09 | 1993-11-09 | Gas fired exhaust gas boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27949293A JP3621711B2 (en) | 1993-11-09 | 1993-11-09 | Gas fired exhaust gas boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07133902A true JPH07133902A (en) | 1995-05-23 |
| JP3621711B2 JP3621711B2 (en) | 2005-02-16 |
Family
ID=17611806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27949293A Expired - Lifetime JP3621711B2 (en) | 1993-11-09 | 1993-11-09 | Gas fired exhaust gas boiler |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3621711B2 (en) |
-
1993
- 1993-11-09 JP JP27949293A patent/JP3621711B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP3621711B2 (en) | 2005-02-16 |
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