JPH0367940A - Ice heat accumulator and manufacture of the same - Google Patents
Ice heat accumulator and manufacture of the sameInfo
- Publication number
- JPH0367940A JPH0367940A JP20427889A JP20427889A JPH0367940A JP H0367940 A JPH0367940 A JP H0367940A JP 20427889 A JP20427889 A JP 20427889A JP 20427889 A JP20427889 A JP 20427889A JP H0367940 A JPH0367940 A JP H0367940A
- Authority
- JP
- Japan
- Prior art keywords
- cooling
- header
- outside
- cooling pipe
- discharge
- 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
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 238000001816 cooling Methods 0.000 claims abstract description 66
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000002826 coolant Substances 0.000 claims abstract description 8
- 238000007710 freezing Methods 0.000 claims abstract description 8
- 230000008014 freezing Effects 0.000 claims abstract description 8
- 238000005338 heat storage Methods 0.000 claims description 16
- 125000006850 spacer group Chemical group 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 6
- 239000000110 cooling liquid Substances 0.000 abstract description 8
- 238000004804 winding Methods 0.000 abstract description 3
- 238000009825 accumulation Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 229920003002 synthetic resin Polymers 0.000 description 3
- 239000000057 synthetic resin Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000012809 cooling fluid Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
Landscapes
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は夜間電力を利用して冷却熱に変換し、これを貯
蔵する氷蓄熱装置及びその製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ice heat storage device that uses nighttime electricity to convert it into cooling heat and stores it, and a method for manufacturing the same.
夜間電力の蓄積手段として水を冷凍して氷とし、昼間に
は融解熱を利用して冷却エネルギーとして使用すること
は以前から提案されている。It has long been proposed to freeze water into ice as a means of storing electricity at night, and use the heat of fusion as cooling energy during the day.
この場合、氷結に際し膨張し、槽を破損するおそれがあ
る。これを防止するため例えば槽内に冷却管を螺旋状に
配し、外周から冷却液を供給し、槽内の水を外周から冷
却し、槽内周側から凍結し、氷の膜を形成し、槽の破損
を防止する手段も提案されている（例えば実開昭６３−
１７５７７５号）。In this case, there is a risk that it will expand upon freezing and damage the tank. To prevent this, for example, cooling pipes are arranged in a spiral inside the tank, and cooling liquid is supplied from the outer periphery to cool the water in the tank from the outer periphery and freeze from the inner periphery of the tank, forming a film of ice. , measures to prevent damage to the tank have also been proposed (for example, Utility Model Application No. 63-
No. 175775).
この場合、槽の直径が比較的小さい場合には問題はない
が、槽の直径が比較的大となるとき、中心付近の冷却効
果が劣る等の問題がある。In this case, there is no problem when the diameter of the tank is relatively small, but when the diameter of the tank is relatively large, there are problems such as poor cooling effect near the center.
本発明はかかる点に鑑み、槽の内周縁と共に中心部付近
においても凍結を効果的に行い、氷蓄熱量の増加を計る
ことを目的とする。In view of this, the present invention aims to effectively freeze not only the inner peripheral edge of the tank but also the vicinity of the center, thereby increasing the amount of ice heat storage.
上記目的を達成するための本発明の氷蓄熱装置は、渦巻
状とした刻をなす多数の冷却管を上下方向に所定ピッチ
を以て交互に配して槽内に収納し、一方の冷却管群は外
端を冷却液供給ヘッダに、また内端を排出ヘッダに連結
し、他方の冷却管群は内端を冷却液供給ヘッダに、また
外端を排出ヘッダに連結し、両冷却管群のそれぞれに逆
方向に冷却液を流通し、槽内の水を中心部及び外周の両
方から氷結するようにしたものである。In order to achieve the above object, the ice heat storage device of the present invention has a large number of spirally carved cooling tubes arranged vertically alternately at a predetermined pitch and housed in a tank. The outer end is connected to the coolant supply header and the inner end is connected to the discharge header, and the other cooling tube group has the inner end connected to the coolant supply header and the outer end to the discharge header. A cooling liquid is passed in the opposite direction to freeze the water in the tank from both the center and the outer periphery.
また第２の発明は上記氷蓄熱装置の製造方法に係り、多
数の冷却管を並列し、鎖管の先端を交互に供給ヘッダと
排出ヘッダに取り付け、かつ並列した冷却管には所定ピ
ッチを以てスペーサを取り付け、該スペーサにより各冷
却管相互間を所定間隔に保持し、ついで上記供給ヘッダ
、排出ヘッダを中心として渦巻状に巻回し、上記スペー
サにより内外管間に所定間隔を存ぜしめ、巻き付けた冷
却管群のうち上記供給ヘッダに取り付けた冷却管群に対
し排出ヘッダを、また排出ヘッダに取り付けた冷却管群
には供給ヘッダを取り付け、渦巻の内外に位置する入口
ヘッダ間及び排出ヘッダ間にはそれぞれ冷却管群を配し
、それらを槽内に収納するようにしたものである。A second invention relates to the method for manufacturing the ice heat storage device, in which a large number of cooling pipes are arranged in parallel, the ends of the chain pipes are attached alternately to the supply header and the discharge header, and the parallel cooling pipes are provided with spacers at a predetermined pitch. The spacers keep the cooling pipes at a predetermined distance from each other, and the cooling pipes are then spirally wound around the supply header and the discharge header. Out of the tube group, a discharge header is attached to the cooling tube group attached to the above-mentioned supply header, a supply header is attached to the cooling tube group attached to the discharge header, and a A group of cooling pipes is arranged in each, and these are housed in a tank.
対をなす冷却管群のうち、一方の冷却管群に−
は外方から内方に向かって、また他方の冷却管群には内
方から外方に向かってそれぞり冷却液が供給される。こ
れにより槽内の水は槽内周辺及び中心部から氷結を開始
する。この際、氷結に伴う膨張は中心部と槽内周との中
間部において上方に向かって行われ、槽を損傷すること
はない。Of the pair of cooling tube groups, cooling fluid is supplied to one cooling tube group from outside to the inside, and to the other cooling tube group from the inside to the outside. Ru. As a result, the water in the tank starts to freeze from the periphery and center of the tank. At this time, the expansion due to freezing occurs upward in the middle between the center and the inner periphery of the tank, without damaging the tank.
また製造に際しては、並列した冷却管相互を所定間隔に
保持するスペーサの高さが渦巻きの内外管の間隔を決定
する作用を兼ねるもので、従って所定ピッチの渦巻き状
に巻き取ることは容易である。In addition, during manufacturing, the height of the spacer that holds the parallel cooling tubes at a predetermined distance also serves to determine the spacing between the inner and outer tubes of the spiral, so it is easy to wind it into a spiral shape with a predetermined pitch. .
第１図は本発明の氷蓄熱装置の原理説明図である。氷蓄
熱装置１は、槽２内に対をなす冷却管３ａ、３ｂを螺旋
状に巻回して収納する。それぞれの冷却管３ａ、３ｂの
両端は冷却液供給ヘッダ４ａ、４．ｂ及び排出ヘッダ５
ａ、５ｂに連結する。ただし一方の冷却管３ａに刻する
供給ヘッダ４ａは渦巻の外側に、排出ヘッダ５ａは内側
に設け、他方の冷却管３ｂに対する供給ヘッダ４ｂは渦
巻の内側に、排出ヘッダ５ｂは外側に設け、両者の供給
ヘッダ４ａ、４ｂは連結管６ａにより、また排出ヘッダ
５ａ、５ｂは連結管６ｂに接続する。７はチラー（図示
省略）と供給ヘッダ４ａとを連結する冷却液供給管であ
る。FIG. 1 is an explanatory diagram of the principle of the ice heat storage device of the present invention. In the ice heat storage device 1, a pair of cooling pipes 3a and 3b are spirally wound and housed in a tank 2. Both ends of each cooling pipe 3a, 3b are connected to cooling liquid supply headers 4a, 4. b and discharge header 5
Connect to a, 5b. However, the supply header 4a cut into one cooling pipe 3a is provided on the outside of the spiral, and the discharge header 5a is provided on the inside. The supply headers 4a, 4b are connected to a connecting pipe 6a, and the discharge headers 5a, 5b are connected to a connecting pipe 6b. 7 is a coolant supply pipe that connects a chiller (not shown) and the supply header 4a.
これにより冷却液は一方の冷却管３ａに対しては渦巻の
外側から内方に、他方の冷却管３ｂに対しては内方から
外方に向かって流通する。As a result, the cooling liquid flows inward from the outside of the spiral to one cooling pipe 3a, and flows from the inside to the outside to the other cooling pipe 3b.
従って槽２内の水は内外両側から氷結を開始し、従来の
外側からのみの氷結方法に比し、槽内金体の水に対し氷
結速度は大となり、氷蓄熱容量が大となる。Therefore, the water in the tank 2 starts to freeze from both the inside and outside, and compared to the conventional method of freezing only from the outside, the water in the metal body inside the tank freezes at a faster rate and has a larger ice heat storage capacity.
なお、氷結に際して収納する水は若干の膨張を生しるが
、槽２は内周辺に形成する氷の層により保護されて破損
することがなく、従って水は中心部と外周部との中間部
付近において上方に膨出する。Although the stored water expands slightly when it freezes, the tank 2 is protected by the layer of ice that forms around the inner periphery and will not be damaged. It bulges upward in the vicinity.
次に第２図以下は本発明の実施例を示す。氷蓄熱装置１
０は槽ｌｌ内に前述の原理説明図と同様に対をなす多数
の冷却管群１２ａ、１２ｂ（以下総称するときは冷却管
１２という）を螺旋状に巻回して収納する。ただし両冷
却管群１２ａ、１２ｂは上下方向に交互に所定ピッチを
以て設けられる。一方の冷却管群１２ａに刻しては外方
を冷却液供給ヘッダ１３ａに、また内方を排出ヘッダ１
４ａに接続し、他方の冷却管群】２Ｉ）に刻しては内方
を冷却液供給ヘッダ１３ｂに、また外方を排出ヘッダ１
４ｂに接続する。 １５ａは両供給ヘッダ１３ａ、１３
ｂを連結する連結管、１５ｂは両排出ヘッダ１５ａ。Next, FIG. 2 and subsequent figures show embodiments of the present invention. Ice heat storage device 1
In tank 11, a large number of pairs of cooling tube groups 12a and 12b (hereinafter collectively referred to as cooling tubes 12) are spirally wound and housed in the same way as in the above-described principle explanatory diagram. However, both cooling tube groups 12a and 12b are provided alternately at a predetermined pitch in the vertical direction. One of the cooling pipe groups 12a is carved so that the outside is connected to the cooling liquid supply header 13a, and the inside is connected to the discharge header 1.
4a, and connect the other cooling pipe group 2I) to the cooling liquid supply header 13b on the inside and the discharge header 1 on the outside.
Connect to 4b. 15a is both supply headers 13a, 13
A connecting pipe 15b connects the two discharge headers 15a.
１５ｂを連結する連結管である。また１６は内外両冷却
管１２．１２間に挿入されるスペーサである。このスペ
ーサ１６は合成樹脂板等を以て構成し、第４図及び第５
図に示す如く冷却管１２を弾性にて圧嵌する嵌合孔１７
を所定ピッチ＠に穿孔し、その高さｈは渦巻きのピッチ
を決定するための所定長としたものである。なお、最上
部の嵌合孔と上端１６ａとの長さ２（第３図、第４図）
は槽１１内に挿入したとき、第３図に示す如く蓋１８に
対し近接対向させる。これにより凍結時の膨張に伴って
冷却管１２の持ち上げられるのを抑制させることができ
る。This is a connecting pipe that connects 15b. Further, 16 is a spacer inserted between the inner and outer cooling pipes 12 and 12. This spacer 16 is made of a synthetic resin plate, etc., and is shown in FIGS. 4 and 5.
As shown in the figure, a fitting hole 17 into which the cooling pipe 12 is elastically fitted
are perforated at a predetermined pitch @, and the height h thereof is a predetermined length for determining the spiral pitch. In addition, the length 2 between the uppermost fitting hole and the upper end 16a (Fig. 3, Fig. 4)
When inserted into the tank 11, it is placed close to and opposed to the lid 18 as shown in FIG. This can prevent the cooling pipe 12 from being lifted up due to expansion during freezing.
次に第６図は本発明の氷蓄熱装置の製造方法、特に冷却
管１２の渦巻き形成要領を示すものである。即ち、リー
ル（図示省略）等にポリエチレン等の合成樹脂製バイブ
を以てする冷却管を巻き付けたロール材を多数収納する
例えば４列４段の棚を７合併列し、これから順次冷却管
１２を繰り出してその先端を交互に冷却管群１２ａ、１
２ｂとし、一方の冷却管群１２ａは排出ヘッダ１４ａに
、他方の冷却管群１２ｂは供給ヘッダ１３ｂに接続する
。 １９は接続パイプであり、一方をそれぞれ供給ヘッ
ダ１３ｂ、排出ヘッダ１４ａに螺入等により固着し、他
方は各冷却管１２を圧入止着する。Next, FIG. 6 shows a method for manufacturing an ice heat storage device according to the present invention, particularly a method for forming a spiral in the cooling pipe 12. That is, for example, 7 shelves of 4 rows and 4 tiers are arranged to store a large number of roll materials in which cooling tubes with vibrators made of synthetic resin such as polyethylene are wrapped around reels (not shown), etc., and the cooling tubes 12 are sequentially rolled out from there. The tips of the cooling tube groups 12a and 1 are alternately connected to each other.
2b, one cooling tube group 12a is connected to the discharge header 14a, and the other cooling tube group 12b is connected to the supply header 13b. Reference numeral 19 denotes a connecting pipe, one of which is fixed to the supply header 13b and the discharge header 14a by screwing or the like, and the other is fixed to each cooling pipe 12 by being press-fitted.
しかる後、所定間隔毎にポリブレピレン等の合成樹脂製
スペーサ１６を並列する各冷却管に対し」ニガより押し
込み止着する。これにより各７−
冷却管相互間の間隔は一定に維持される。ついで上記供
給ヘッダ１３ｂ、排出ヘッダ１４ａを中心として渦巻き
状に巻き取る。この際、前記スペーサ１６を取り付ける
ことにより渦巻のピッチは一定として巻き取られる。そ
して所定直径に巻き取った後、一方の冷却管群１２ａに
は供給ヘッダ１３ａを、他方の冷却管群１２ｂには排出
ヘッダ１４ｂをそれぞれ前記要領にて止着する。Thereafter, spacers 16 made of synthetic resin such as polypropylene are inserted at predetermined intervals into each of the cooling pipes arranged in parallel by forceps and fixed. As a result, the distance between each cooling pipe is maintained constant. Then, it is wound up in a spiral shape around the supply header 13b and the discharge header 14a. At this time, by attaching the spacer 16, the spiral pitch is kept constant. After winding it up to a predetermined diameter, the supply header 13a is fixed to one cooling tube group 12a, and the discharge header 14b is fixed to the other cooling tube group 12b in the manner described above.
しかる後、内外の供給ヘッダ１３ａ，１３ｂの相互間及
び排出ヘッダ１４ａ，１４ｂの相互間をそれぞれ連結管
１５ａ，１５ｂにより連結し、槽１１内に収納する（第
２図）。Thereafter, the inner and outer supply headers 13a and 13b and the discharge headers 14a and 14b are connected by connecting pipes 15a and 15b, respectively, and the tank is housed in the tank 11 (FIG. 2).
本発明によるときは、対をなす冷却管群をそれぞれ螺旋
状に巻回し、一方の冷却管群に対しては外方から内方に
向かって、また他方の冷却管群に対しては内方から外方
に向かってそれぞれ冷却液を供給するようにしたから、
内外両方から氷結を開始する。従って氷結が効率良く行
われ、蓄熱量を大とすることができる。According to the present invention, each pair of cooling tube groups is wound spirally, and one cooling tube group is wound from the outside to the inside, and the other cooling tube group is wound from the outside to the inside. Since the cooling liquid is supplied outward from each,
Freezing begins from both the inside and outside. Therefore, freezing is performed efficiently and the amount of heat storage can be increased.
またこの氷蓄熱装置の製造に当たり、並列した多数の冷
却管を交互に供給ヘッダ、排出ヘッダに取り付けること
により対をなす冷却管群としたから、その構成は容易で
ある。また各冷却管を所定ピッチに保持するスペーサを
取り付け、このスペーサの高さを適宜選定し、これによ
り渦巻状に巻き付けたとき、そのピッチを決定するよう
にしたから、極めて容易に所定ピッチの渦巻状に巻き付
けることができる。Furthermore, in manufacturing this ice heat storage device, a large number of parallel cooling tubes are alternately attached to the supply header and the discharge header to form a pair of cooling tube groups, so that the structure is easy. In addition, spacers are attached to each cooling pipe to maintain it at a predetermined pitch, and the height of this spacer is appropriately selected to determine the pitch when the pipes are wound in a spiral shape. It can be wrapped into a shape.
第１図は本発明の氷蓄熱装置の作動原理説明図、第２図
は氷蓄熱装置の平面図、第３図は第２図におけるＸ−Ｘ
線に沿う拡大説明図、第４図はスペーサの斜視図、第５
図はスペーサの一部正面図、第６図は冷却管群の巻取要
領説明図である。
ｉ．ｉｏは氷蓄熱装置、２， １１は槽、３ａ。
３ｂは冷却管、４．ａ，４ｂ， １３ａ， １３ｂ
は供給ヘッダ、
５
１
ｂ。
４−ａ。
４ｂは排
出ヘッダ、
】
ａデ
ｂは冷却管群、
１６は
スペーサである。Fig. 1 is an explanatory diagram of the operating principle of the ice heat storage device of the present invention, Fig. 2 is a plan view of the ice heat storage device, and Fig. 3 is an X-X in Fig. 2.
An enlarged explanatory view along the line, Figure 4 is a perspective view of the spacer, Figure 5 is a perspective view of the spacer.
The figure is a partial front view of the spacer, and FIG. 6 is an explanatory diagram of the winding procedure for the cooling tube group. i. io is an ice heat storage device, 2 and 11 are tanks, and 3a. 3b is a cooling pipe; 4. a, 4b, 13a, 13b
is the supply header, 5 1 b. 4-a. 4b is a discharge header, ] a and b are cooling pipe groups, and 16 is a spacer.
Claims (2)
所定ピッチを以て交互に配して槽内に収納し、一方の冷
却管群は外端を冷却液供給ヘッダに、また内端を排出ヘ
ッダに連結し、他方の冷却管群は内端を冷却液供給ヘッ
ダに、また外端を排出ヘッダに連結し、両冷却管群のそ
れぞれに逆方向に冷却液を流通し、槽内の水を中心部及
び外周の両方から氷結することを特徴とする氷蓄熱装置
。(1) A large number of spirally paired cooling tubes are arranged vertically alternately at a predetermined pitch and housed in the tank, and one cooling tube group has its outer end connected to the coolant supply header, and its inner end connected to the coolant supply header. is connected to the discharge header, and the inner end of the other cooling tube group is connected to the coolant supply header, and the outer end is connected to the discharge header. An ice heat storage device characterized by freezing water from both the center and the outer periphery.
ヘッダと排出ヘッダに取り付け、かつ並列した冷却管に
は所定ピッチを以てスペーサを取り付け、該スペーサに
より各冷却管相互間を所定間隔に保持し、ついで上記供
給ヘッダ、排出ヘッダを中心として渦巻状に巻回し、上
記スペーサにより内外管間に所定間隔を存ぜしめ、巻き
付けた冷却管群のうち上記供給ヘッダに取り付けた冷却
管群に対し排出ヘッダを、また排出ヘッダに取り付けた
冷却管群には供給ヘッダを取り付け、渦巻の内外に位置
する入口ヘッダ間及び排出ヘッダ間にはそれぞれ冷却管
群を配し、それらを槽内に収納したことを特徴とする氷
蓄熱装置の製造方法。(2) A large number of cooling pipes are arranged in parallel, the tips of the pipes are attached alternately to the supply header and the discharge header, spacers are attached to the parallel cooling pipes at a specified pitch, and the spacers provide a specified distance between each cooling pipe. Then, the cooling tubes are wound spirally around the supply header and the discharge header, and a predetermined interval is created between the inner and outer tubes by the spacer. A supply header is attached to the cooling pipe group attached to the discharge header, and a cooling pipe group is arranged between the inlet headers and the discharge header located inside and outside the vortex, and these are placed inside the tank. A method for manufacturing an ice heat storage device characterized by storing the ice.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1204278A JPH0676851B2 (en) | 1989-08-07 | 1989-08-07 | Ice heat storage device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1204278A JPH0676851B2 (en) | 1989-08-07 | 1989-08-07 | Ice heat storage device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0367940A true JPH0367940A (en) | 1991-03-22 |
| JPH0676851B2 JPH0676851B2 (en) | 1994-09-28 |
Family
ID=16487835
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1204278A Expired - Lifetime JPH0676851B2 (en) | 1989-08-07 | 1989-08-07 | Ice heat storage device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0676851B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05312356A (en) * | 1992-05-06 | 1993-11-22 | Mitsubishi Electric Corp | Heat storage tank in heat storage type air conditioner |
| JP2010002060A (en) * | 2008-06-18 | 2010-01-07 | Panasonic Corp | Heat exchanger |
| KR102595248B1 (en) * | 2023-05-17 | 2023-10-27 | 아일수지공업 주식회사 | Ice heat storage-based heat storage tank with reinforced stable coupling between header and pipe |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61140764A (en) * | 1984-12-12 | 1986-06-27 | 株式会社東京三冷社 | Freezing device for heat exchange |
-
1989
- 1989-08-07 JP JP1204278A patent/JPH0676851B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61140764A (en) * | 1984-12-12 | 1986-06-27 | 株式会社東京三冷社 | Freezing device for heat exchange |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05312356A (en) * | 1992-05-06 | 1993-11-22 | Mitsubishi Electric Corp | Heat storage tank in heat storage type air conditioner |
| JP2010002060A (en) * | 2008-06-18 | 2010-01-07 | Panasonic Corp | Heat exchanger |
| KR102595248B1 (en) * | 2023-05-17 | 2023-10-27 | 아일수지공업 주식회사 | Ice heat storage-based heat storage tank with reinforced stable coupling between header and pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0676851B2 (en) | 1994-09-28 |
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