JP2816523B2 - Package refrigerator - Google Patents
Package refrigeratorInfo
- Publication number
- JP2816523B2 JP2816523B2 JP5242096A JP24209693A JP2816523B2 JP 2816523 B2 JP2816523 B2 JP 2816523B2 JP 5242096 A JP5242096 A JP 5242096A JP 24209693 A JP24209693 A JP 24209693A JP 2816523 B2 JP2816523 B2 JP 2816523B2
- Authority
- JP
- Japan
- Prior art keywords
- casing
- compressor
- exhaust
- exhaust duct
- refrigerator
- 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
Links
- 239000003507 refrigerant Substances 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 239000007921 spray Substances 0.000 claims description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 34
- 229910021529 ammonia Inorganic materials 0.000 description 7
- 239000003463 adsorbent Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- KYKAJFCTULSVSH-UHFFFAOYSA-N chloro(fluoro)methane Chemical compound F[C]Cl KYKAJFCTULSVSH-UHFFFAOYSA-N 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 210000004400 mucous membrane Anatomy 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Landscapes
- Applications Or Details Of Rotary Compressors (AREA)
- Separation Of Gases By Adsorption (AREA)
- Compressor (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明の冷凍機は冷凍装置や空調
装置の分野で使用される。BACKGROUND OF THE INVENTION The refrigerator of the present invention is used in the field of refrigeration equipment and air conditioners.
【０００２】[0002]
【従来の技術】冷凍機の圧縮機には冷媒としてフロンガ
スが使用されてきたが、フロンガスの使用は規制される
ことになり、代替冷媒として例えばアンモニヤガスが見
直されている。2. Description of the Related Art Freon gas has been used as a refrigerant in a compressor of a refrigerator. However, the use of chlorofluorocarbon gas has been regulated, and for example, ammonia gas has been reviewed as an alternative refrigerant.
【０００３】しかし、アンモニヤガスは可燃性で危険性
を孕み、また毒性があって、長いことアンモニヤに接す
ると人体の鼻や咽喉などの粘膜に障害をもたらすので、
圧縮機にはアンモニヤガスが漏れないようにせねばなら
ない。[0003] However, ammonia gas is flammable and dangerous, and it is toxic. If exposed to ammonia for a long time, it causes damage to the mucous membranes of the human nose and throat.
The compressor must be kept free of ammonia gas.
【０００４】[0004]
【発明が解決しようとする課題】ところで圧縮機のロー
タ軸（入力軸）はモータの回転軸（出力軸）へジョイン
トにて接続されており、モータの駆動により圧縮機は作
動させられるが、圧縮機の作動中または停止中に圧縮機
内の冷媒たるアンモニヤガスが漏れる箇所は圧縮機のハ
ウジングにおけるロータ軸の貫通しているロータ軸支承
部である。By the way, the rotor shaft (input shaft) of the compressor is connected to the rotation shaft (output shaft) of the motor by a joint, and the compressor is operated by driving the motor. The point where the ammonia gas as a refrigerant in the compressor leaks during operation or stoppage of the compressor is a rotor shaft support portion through which the rotor shaft passes in the compressor housing.
【０００５】アンモニヤガスの漏れ防止には圧縮機にお
ける前記ロータ軸支承部のメカニカルシールが充分にな
されねばならぬが、そのシールは信頼性の高い構造のも
のとしなければならない。また、究極はノンシール構造
とせねばならず、いきおい製造コストが高くなるという
課題がある。[0005] In order to prevent leakage of ammonia gas, a sufficient mechanical seal of the rotor shaft support portion in the compressor must be provided, but the seal must have a highly reliable structure. In addition, ultimately, a non-seal structure must be adopted, and there is a problem that the production cost is high.
【０００６】本発明は圧縮機および凝縮器よりなる冷凍
機をパッケージ用のコンパクトなケーシング内に収納
し、また、圧縮機におけるロータ軸の貫通支承部のシー
ルにこだわることがなく、ロータ軸支承部から漏れるア
ンモニヤガスを脱ガス手段で処理し、アンモニヤガスが
除去されたガスをケーシングから大気中に排気できるパ
ッケージ冷凍機を提供できるようにした。According to the present invention, a refrigerator comprising a compressor and a condenser is housed in a compact casing for a package, and a seal of a through-bearing portion of a rotor shaft in the compressor is not obstructed. The present invention is capable of providing a package refrigerator capable of processing the ammonia gas leaking from the casing by a degassing means and exhausting the gas from which the ammonia gas has been removed from the casing to the atmosphere.
【０００７】[0007]
【課題を解決するための手段】しかして本発明に係る第
１手段のパッケージ冷凍機は、圧縮機、凝縮器よりなる
冷凍機をコンパクトなケーシング内に収納し、このケー
シングに、内端入口がケーシング内に開口し、外端出口
がケーシング外に開口する排気ダクトを貫通せしめて、
排気ダクトの前記外端出口に縦方向をなす排風胴を接続
し、この排風胴には下部に受槽を、中高部内に撒水ノズ
ルを設けたものとしてある。According to a first aspect of the present invention, there is provided a package refrigerator including a compressor and a refrigerator which are housed in a compact casing, and the casing has an inner inlet. Opening inside the casing, letting the outer end outlet pass through the exhaust duct opening outside the casing,
A vertical exhaust duct is connected to the outer end outlet of the exhaust duct, and the exhaust duct is provided with a receiving tank at a lower part and a water spray nozzle at a middle and high part.
【０００８】また、第２手段に係るパッケージ冷凍機
は、モータと圧縮機間に、モータの回転軸とこの回転軸
へ接続した圧縮機のロータ軸を囲む筒状のカバーを設
け、このカバーの一部に排気管を接続した圧縮装置と凝
縮器よりなる冷凍機をコンパクトなケーシング内に収納
し、このケーシングに、内端入口がケーシング内に開口
し、外端出口がケーシング外に開口する排気ダクトを貫
通せしめて、排気ダクトの前記外端出口に縦方向をなす
排風胴を接続し、この排風胴には下部に受槽を、中高部
内に撒水ノズルを設けたものとしてあり、さらに第３手
段に係るパッケージ冷凍機は、前記排気管の適所に圧縮
機からの漏洩冷媒ガス除去用の吸着器を設けたものとし
てある。In the package refrigerator according to the second means, a cylindrical cover is provided between the motor and the compressor so as to surround a rotation shaft of the motor and a rotor shaft of the compressor connected to the rotation shaft. A refrigerator consisting of a compressor and a condenser partially connected to an exhaust pipe is housed in a compact casing. In this casing, an exhaust with an inner end inlet opening into the casing and an outer end outlet opening outside the casing. The duct is penetrated, and a vertical exhaust duct is connected to the outer end outlet of the exhaust duct.The exhaust duct has a receiving tank at the lower part, and a water spray nozzle in the middle and high parts, and further has a The package refrigerator according to the three means is provided with an adsorber for removing refrigerant gas leaking from the compressor at an appropriate position of the exhaust pipe.
【０００９】[0009]
【作用】第１手段の冷凍機では、圧縮機から漏れた冷媒
ガスはケーシング内に溜まり、ケーシング内の冷媒ガス
と空気の混合ガスは排気ダクト内に設けた排気用ファン
にて吸い込まれ、排風胴内に送り出される。混合ガスは
排風胴内を上昇するが、この際冷媒ガスはノズルからス
プレーされる水に溶けて落下し、排風胴内の下部受槽に
溜まり、排風胴からは冷媒ガスが除去された空気のみが
排気される。In the refrigerator of the first means, the refrigerant gas leaking from the compressor accumulates in the casing, and the mixed gas of the refrigerant gas and the air in the casing is sucked by the exhaust fan provided in the exhaust duct, and is exhausted. Sent out into the wind tunnel. The mixed gas rises in the exhaust wind tunnel, and at this time, the refrigerant gas dissolves in water sprayed from the nozzle and falls, accumulates in a lower receiving tank in the exhaust wind tunnel, and the refrigerant gas is removed from the exhaust wind tunnel. Only air is exhausted.
【００１０】第２手段の冷凍機では、圧縮機から漏れた
冷媒ガスは排気管により排気ダクトに入り、また、排気
管を経ないでケーシング内に漏れた冷媒ガスと空気の混
合ガスも排気ダクト内に吸入され、排気ファンによって
排風胴内に送り込まれる。混合ガスは排風胴内を上昇す
るが、この際冷媒ガスはノズルからスプレーされる水に
溶けて落下し、排風胴内の下部受槽に溜まり、排風胴か
らは冷媒ガスが除去されたクリーンな空気のみが排気さ
れる。[0010] In the refrigerator of the second means, the refrigerant gas leaking from the compressor enters the exhaust duct by the exhaust pipe, and the mixed gas of the refrigerant gas and the air leaking into the casing without passing through the exhaust pipe is also discharged to the exhaust duct. The air is sucked into the inside and is sent into the exhaust wind tunnel by the exhaust fan. The mixed gas rises in the exhaust wind tunnel, and at this time, the refrigerant gas dissolves in water sprayed from the nozzle and falls, accumulates in a lower receiving tank in the exhaust wind tunnel, and the refrigerant gas is removed from the exhaust wind tunnel. Only clean air is exhausted.
【００１１】第３手段の冷凍機では、前記排気管中に設
けた吸着器によって予め冷媒ガスが除去され、吸着器で
除去し切れなかった残溜冷媒ガスは排風胴を通る際にス
プレー水によって２段階に除去される。[0011] In the refrigerator of the third means, the refrigerant gas is removed in advance by an adsorber provided in the exhaust pipe, and the residual refrigerant gas which has not been completely removed by the adsorber is sprayed with water when passing through the exhaust drum. In two stages.
【００１２】[0012]
【実施例】以下本発明の装置を添付図面に示す実施例図
に基づいて説明する。これらの図において、符号１は冷
媒に例えばアンモニヤを使用する圧縮機、１ａはそのハ
ウジング、１ｂはロータ軸支承部、２はモータ、２ａは
その回転軸、３はモータの回転軸を圧縮機のロータ軸へ
結合させている継手で、圧縮機とモータで圧縮装置を構
成している。４は凝縮器を示し、圧縮機と凝縮器でコン
デンシングユニット、すなわち冷凍機を構成しており、
本発明においては前記冷凍機をパッケージ用ケーシング
５内にコンパクトに収納してある。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An apparatus according to the present invention will be described below with reference to the accompanying drawings. In these figures, reference numeral 1 denotes a compressor using, for example, ammonia for the refrigerant, 1a denotes a housing thereof, 1b denotes a rotor shaft support, 2 denotes a motor, 2a denotes a rotating shaft thereof, and 3 denotes a rotating shaft of the motor by the compressor. The joint connected to the rotor shaft forms a compressor with a compressor and a motor. Reference numeral 4 denotes a condenser, and a condensing unit, that is, a refrigerator is constituted by the compressor and the condenser.
In the present invention, the refrigerator is compactly stored in the package casing 5.
【００１３】また、圧縮機のロータ軸とモータの回転軸
とを囲むように圧縮機とモータ間に筒体よりなるカバー
６を設け、またカバー６の適所、例えば上側部の適所に
は排気管７を接続して、この排気管に、冷媒たるアンモ
ニヤガスを除去する吸着器８を設けてあり、符号９は前
記カバー６に設けた空気取入口を示す。A cover 6 made of a cylindrical body is provided between the compressor and the motor so as to surround the rotor shaft of the compressor and the rotation shaft of the motor. The exhaust pipe is provided with an adsorber 8 for removing ammonia gas as a refrigerant. Reference numeral 9 denotes an air intake provided in the cover 6.
【００１４】アンモニヤガス吸着器８には種々のものが
あるが、例えば図３のように密閉容器８ａ内に活性炭等
の吸着剤８ｂを充填した構造ものとし、この場合は、吸
着剤がその能力を喪失したときには容器８ａごと取り替
えるか、あるいは中の吸着剤のみを適宜交換できる構造
のものとする。There are various types of the ammonia gas adsorber 8. For example, as shown in FIG. 3, the ammonia gas adsorber 8 has a structure in which an adsorbent 8b such as activated carbon is filled in a closed container 8a. Is lost, the entire container 8a is replaced, or only the adsorbent inside is replaced as appropriate.
【００１５】ケーシングの上壁部には排気用ファン１０
を内部に有する排気用ダクト１１が貫通しており、この
ダクトにおけるケーシング内に開口している入口端部に
は前記排気管７の出口端部を挿入してあって、ダクト１
１には排気管７からのガスのほかにケーシング内のガス
もファン１０によって吸い込まれるようになっている。An exhaust fan 10 is provided on the upper wall of the casing.
The outlet end of the exhaust pipe 7 is inserted into the inlet end of the duct, which is open in the casing, and the duct 1
The gas in the casing is sucked by the fan 10 in addition to the gas from the exhaust pipe 7.
【００１６】また、排気用ダクト１１におけるケーシン
グ外に突出する開口端部には垂直な排風胴１２が接続さ
れ、同排風胴にはその中高部内に撒水ノズル１３を配設
してあるとともに、下部には受槽１４を設けてあって、
この受槽１４は開閉弁１５を有するドレン管１６でタン
ク１７に接続してあり、図中の符号２５は撒水ンズル１
３からの水が排気ダクト１１内に入り込むのを防止する
邪魔板である。A vertical air discharge duct 12 is connected to an open end of the exhaust duct 11 protruding out of the casing, and the water discharge nozzle 13 is disposed in the middle and high portion of the air discharge duct. , A receiving tank 14 is provided in the lower part,
The receiving tank 14 is connected to the tank 17 by a drain pipe 16 having an on-off valve 15.
3 is a baffle plate for preventing water from entering the exhaust duct 11.
【００１７】しかしてタンク１７内の水中には、凝縮器
４内のアンモニヤガスのガス圧が過大になるとアンモニ
ヤガスをリークさせるよう安全弁１８を備える放出管１
９の先端を開口させてある。In the water in the tank 17, the discharge pipe 1 provided with the safety valve 18 to leak the ammonia gas when the gas pressure of the ammonia gas in the condenser 4 becomes excessive.
9 has an open end.
【００１８】前記撒水ノズル１３には例えば冷却塔２０
用の冷却水水槽２１内の冷却水がポンプ２２によって給
水管２３から供給されるが、冷却水の供給は、例えば前
記ダクト１１内に配設したアンモニヤガス検出センサ２
４からのアンモニヤ濃度信号（アンモニヤガスの濃度が
所定値以上になったときの信号）が入力される設定器２
６より指令信号（電気信号）により給水管２３の電磁弁
２７が開成されて行われる。The water spray nozzle 13 has a cooling tower 20 for example.
Water in a cooling water tank 21 is supplied from a water supply pipe 23 by a pump 22. The supply of the cooling water is performed by, for example, an ammonia gas detection sensor 2 provided in the duct 11.
Setting device 2 to which the ammonia concentration signal (signal when the concentration of the ammonia gas has become equal to or more than a predetermined value) is inputted.
6, the electromagnetic valve 27 of the water supply pipe 23 is opened by a command signal (electric signal).
【００１９】なお、図示において符号２８は冷却器で、
冷凍運転時には凝縮器からのアンモニヤ液が往管２９か
ら供給され、冷却器からのアンモニヤ蒸気は復管３０を
経て圧縮機に吸入される。In the drawing, reference numeral 28 denotes a cooler.
During the freezing operation, the ammonia liquid from the condenser is supplied from the forward pipe 29, and the ammonia vapor from the cooler is sucked into the compressor via the return pipe 30.
【００２０】また、冷却器の除霜運転時には前記往管の
電磁弁３１は閉じる反面、ホットガス管３２の電磁弁３
３が開いて圧縮機からの高圧、高温アンモニヤガスが冷
却器へドレンパン３４を経て供給され、冷却器からのア
ンモニヤ蒸気は復管３０から圧縮機に吸入される。During the defrosting operation of the cooler, the solenoid valve 31 of the forward pipe is closed, while the solenoid valve 3 of the hot gas pipe 32 is closed.
3 is opened, high-pressure, high-temperature ammonia gas from the compressor is supplied to the cooler through the drain pan 34, and the ammonia vapor from the cooler is sucked into the compressor from the return pipe 30.
【００２１】なお、符号３５は、ケーシング内が圧縮機
からの排熱で昇温するのを防止するためにケーシングに
設けた空気取入口である。Reference numeral 35 denotes an air inlet provided in the casing to prevent the inside of the casing from rising in temperature due to exhaust heat from the compressor.
【００２２】[0022]
【発明の効果】本発明のパッケージ冷凍機においては、
圧縮機と凝縮器をケーシングに収納してコンパクトなも
のに纏め上げられており、また圧縮機から漏れた冷媒ガ
ス、例えばアンモニヤガスは、最終的には排風胴を通る
際にスプレー水によって除去され、排風胴からはアンモ
ニヤガスが除去された空気のみが大気中に放散されるの
で、冷凍機設置室は安全に保たれ、かつ設置室内の作業
員がアンモニヤガスに侵されるということはない。According to the package refrigerator of the present invention,
The compressor and condenser are housed in a casing and packed into a compact unit.Refrigerant gas leaking from the compressor, such as ammonia gas, is finally removed by spray water when passing through the exhaust duct. Since only the air from which the ammonia gas has been removed is radiated into the atmosphere from the exhaust duct, the refrigerator installation room is kept safe and workers in the installation room are not affected by the ammonia gas. .
【図１】本発明に係るパッケージ冷凍機の一実施例を示
す図。FIG. 1 is a view showing one embodiment of a package refrigerator according to the present invention.
【図２】本発明に使用する圧縮装置の実施例を示す一部
破断正面図。FIG. 2 is a partially cutaway front view showing an embodiment of a compression device used in the present invention.
【図３】アンモニヤ吸着器の一部を切り欠いて示す正面
図。FIG. 3 is a front view showing a part of the ammonia adsorber cut away.
１ 圧縮機 １ａ ハウジング １ｂ ロータ軸支承部 ２ モータ ２ａ 回転軸 ３ 継手 ４ 凝縮器 ５ ケーシング ６ カバー ７ 排気管 ８ アンモニヤガス吸着器 ８ａ 密閉容器 ８ｂ 吸着剤 ９ 空気取入口 １０ 排気用ファン １１ 排気用ダクト １２ 排風胴 １３ 撒水ノズル １４ 受槽 １５ 開閉弁 １６ ドレン管 １７ タンク １８ 安全弁 １９ 放出管 ２０ 冷却塔 ２１ 冷却水水槽 ２２ ポンプ ２３ 給水管 ２４ アンモニヤガス検出センサ ２５ 邪魔板 ２６ 設定器 ２７ 電磁弁 ２８ 冷却器 ２９ 往管 ３０ 復管 ３１ 電磁弁 ３２ ホットガス管 ３３ 電磁弁 ３４ ドレンパン ３５ 空気取入口 DESCRIPTION OF SYMBOLS 1 Compressor 1a Housing 1b Rotor shaft support part 2 Motor 2a Rotating shaft 3 Joint 4 Condenser 5 Casing 6 Cover 7 Exhaust pipe 8 Ammonia gas adsorber 8a Closed container 8b Adsorbent 9 Air intake 10 Exhaust fan 11 Exhaust duct REFERENCE SIGNS LIST 12 exhaust air duct 13 watering nozzle 14 receiving tank 15 on-off valve 16 drain pipe 17 tank 18 safety valve 19 discharge pipe 20 cooling tower 21 cooling water tank 22 pump 23 water supply pipe 24 ammonia gas detection sensor 25 baffle plate 26 setting device 27 electromagnetic valve 28 cooling Container 29 Outgoing pipe 30 Return pipe 31 Solenoid valve 32 Hot gas pipe 33 Solenoid valve 34 Drain pan 35 Air inlet
Claims (3)
トなケーシング内に収納し、このケーシングに、内端入
口がケーシング内に開口し、外端出口がケーシング外に
開口する排気ダクトを貫通せしめて、排気ダクトの前記
外端出口に縦方向をなす排風胴を接続し、この排風胴に
は下部に受槽を、中高部内に撒水ノズルを設けてなるパ
ッケージ冷凍機。1. A refrigerator comprising a compressor and a condenser is housed in a compact casing, in which an inner end inlet opens into the casing and an outer end outlet passes through an exhaust duct opening outside the casing. At least, a package refrigerating machine having a vertical exhaust duct connected to the outer end outlet of the exhaust duct, a receiving tank provided at a lower portion of the exhaust duct, and a water spray nozzle provided at a middle and high section.
の回転軸へ接続した圧縮機のロータ軸を囲むカバーを設
け、このカバーの一部に排気管を接続した圧縮装置と凝
縮器よりなる冷凍機をコンパクトなケーシング内に収納
し、このケーシングに、内端入口がケーシング内に開口
し、外端出口がケーシング外に開口する排気ダクトを貫
通せしめて、排気ダクトの前記外端出口に縦方向をなす
排風胴を接続し、この排風胴には下部に受槽を、中高部
内に撒水ノズルを設けてなるパッケージ冷凍機。2. A compressor and a condenser, wherein a cover is provided between the motor and the compressor, the cover surrounding the rotating shaft of the motor and the rotor shaft of the compressor connected to the rotating shaft, and an exhaust pipe is connected to a part of the cover. The refrigerator is housed in a compact casing, and the casing has an inner end inlet opening into the casing and an outer end outlet passing through an exhaust duct opening outside the casing. A package refrigerating machine having a vertical exhaust wind tunnel connected to the air exhaust duct, a receiving tank provided in a lower portion of the exhaust wind turbine, and a water spray nozzle provided in a middle and high section.
て、排気管の適所に、圧縮機からの漏洩冷媒ガスを除去
する吸着器を設けてなるパッケージ冷凍機。3. The package refrigerator according to claim 2, wherein an adsorber for removing refrigerant gas leaking from the compressor is provided at an appropriate position of the exhaust pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5242096A JP2816523B2 (en) | 1993-09-01 | 1993-09-01 | Package refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5242096A JP2816523B2 (en) | 1993-09-01 | 1993-09-01 | Package refrigerator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0771382A JPH0771382A (en) | 1995-03-14 |
| JP2816523B2 true JP2816523B2 (en) | 1998-10-27 |
Family
ID=17084246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5242096A Expired - Fee Related JP2816523B2 (en) | 1993-09-01 | 1993-09-01 | Package refrigerator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2816523B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102019118984A1 (en) * | 2019-02-06 | 2020-10-08 | Vaillant Gmbh | Diffusion barrier by means of protective layers |
-
1993
- 1993-09-01 JP JP5242096A patent/JP2816523B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0771382A (en) | 1995-03-14 |
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