JP2653175B2 - Heat storage type electric floor heating device - Google Patents
Heat storage type electric floor heating deviceInfo
- Publication number
- JP2653175B2 JP2653175B2 JP1152819A JP15281989A JP2653175B2 JP 2653175 B2 JP2653175 B2 JP 2653175B2 JP 1152819 A JP1152819 A JP 1152819A JP 15281989 A JP15281989 A JP 15281989A JP 2653175 B2 JP2653175 B2 JP 2653175B2
- Authority
- JP
- Japan
- Prior art keywords
- heat storage
- temperature
- power
- floor
- storage material
- 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 - Lifetime
Links
- 238000005338 heat storage Methods 0.000 title claims description 66
- 238000010438 heat treatment Methods 0.000 title claims description 28
- 239000011232 storage material Substances 0.000 claims description 36
- 238000007711 solidification Methods 0.000 claims description 19
- 230000008023 solidification Effects 0.000 claims description 19
- 238000002844 melting Methods 0.000 claims description 18
- 230000008018 melting Effects 0.000 claims description 18
- 230000001172 regenerating effect Effects 0.000 claims description 6
- 238000010411 cooking Methods 0.000 claims description 2
- 230000005611 electricity Effects 0.000 description 10
- 239000000463 material Substances 0.000 description 7
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 4
- 238000005485 electric heating Methods 0.000 description 4
- 238000003303 reheating Methods 0.000 description 4
- 229910052938 sodium sulfate Inorganic materials 0.000 description 4
- 235000011152 sodium sulphate Nutrition 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229920006248 expandable polystyrene Polymers 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000009408 flooring Methods 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Landscapes
- Central Heating Systems (AREA)
Description
【発明の詳細な説明】 ＜産業上の利用分野＞ 本発明は潜熱蓄熱式電気床暖房装置に関するものであ
る。Description: TECHNICAL FIELD The present invention relates to a latent heat storage type electric floor heating device.
＜従来の技術＞ 従来、蓄熱式電気床暖房はコンクリートを蓄熱材とし
て使用する顕熱蓄熱型が主体であり、この方式の床暖房
装置で夜間の割引料金電力と昼間の一般料金電力を併用
する場合には、それぞれの電力の電源として別個にヒー
ティングケーブルなどの電熱線あるいは電熱シートなど
の熱源を設置し、それぞれの利用時間内において別個に
床面温度、あるいは室内温度などを検知して通電を制御
してきた。<Conventional technology> Conventionally, regenerative electric floor heating mainly uses a sensible heat storage type using concrete as a heat storage material, and a floor heating device of this type uses a discounted nighttime electricity and a daytime ordinary electricity. In this case, a heating wire such as a heating cable or a heat source such as an electric heating sheet is separately installed as a power source for each power, and the floor surface temperature or indoor temperature is separately detected and energized during each use time. Has been controlled.
＜発明が解決しようとする課題＞ 「業務用蓄熱調整契約制度」による割引料金電力や融
雪電力などを電熱ヒーターに通電するなどして熱源と
し、蓄熱材を使用する蓄熱式電気床暖房装置において厳
寒期の午後などにおいて蓄熱量が不足し、底面からの熱
供給が不足する場合には、何等かの方法で室内に熱を供
給する。いわゆる「追い焚き」が必要がある。従来のコ
ンクリート蓄熱ではこの「追い焚き」を行うと部屋への
熱供給が行えるが同時にコンクリートにも蓄熱が行わ
れ、その結果、割引料金電力の通電時間において蓄熱で
きる余地が少なくなる。潜熱蓄熱材を使用する床暖房装
置においても融解温度と凝固温度に差がほとんど無い場
合や、容器内の潜熱蓄熱材の温度にむらがある場合にも
同様のことが起こる。「追い焚き」を別個の暖房機によ
って行うと暖房感の違いがあるほか、暖房機を購入する
費用がかかるので好ましくない。床暖房に要する維持費
を低く抑えるためには割引料金電力を最大限に利用して
蓄熱し、一般料金電力の使用を極力抑える必要がある。<Problems to be Solved by the Invention> In a regenerative electric floor heating device that uses a heat storage material as a heat source, such as energizing an electric heater with a discount charge power or snow melting power under the “commercial heat storage adjustment contract system,” it is extremely cold. If the heat storage capacity is insufficient and the heat supply from the bottom surface is insufficient in the afternoon of the period, heat is supplied to the room by some method. So-called "reheating" is necessary. In the case of the conventional concrete heat storage, when this "reheating" is performed, heat can be supplied to the room, but at the same time, heat is also stored in the concrete. As a result, there is less room for storing heat during the energizing time of the discounted power. In a floor heating device using a latent heat storage material, the same occurs when there is almost no difference between the melting temperature and the solidification temperature, or when the temperature of the latent heat storage material in the container is uneven. It is not preferable to perform “reheating” using a separate heater, because there is a difference in the feeling of heating and it costs more to purchase the heater. In order to keep the maintenance cost required for floor heating low, it is necessary to maximize the use of discounted electricity to store heat and to minimize the use of ordinary electricity.
上記の目的を達成するためには蓄熱材の温度は、融解
温度あるいは凝固温度など目的とする温度は均一に保持
される必要がある。また、これらの温度を検知する温度
検知器の取り付け位置は蓄熱材の温度を正確に検知でき
ることが必要である。In order to achieve the above object, the temperature of the heat storage material needs to be maintained uniformly at a target temperature such as a melting temperature or a solidification temperature. In addition, it is necessary that the mounting position of the temperature detector for detecting these temperatures can accurately detect the temperature of the heat storage material.
床内あるいは床面蓄熱型の潜熱蓄熱式電気床暖房装置
では、潜熱蓄熱材の凝固温度は床面温度が22℃から28℃
程度に保持されるよう30℃程度が適当であるが、融解温
度を高くすると割引料金電力が供給される深夜間に床面
に布団をしいて寝るなどすると低温火傷の危険が大きく
なるほか、床仕上げ材などが熱変形を起こし易いという
問題がある。In a floor or floor storage type latent heat storage type electric floor heating system, the solidification temperature of the latent heat storage material is from 22 ℃ to 28 ℃ from the floor surface temperature.
It is appropriate to keep the temperature at about 30 ° C, but if the melting temperature is increased, discounted electricity will be supplied.If you sleep on a futon on the floor at midnight, the risk of low-temperature burns will increase, and There is a problem that a finishing material or the like easily causes thermal deformation.
＜課題を解決するための手段＞ 本発明は前記課題を達成するためになされたものであ
り、割引料金電力と一般料金電力を併用し、一般料金電
力にて追い炊きを行う床内あるいは床面蓄熱式電気床暖
房装置において、凝固温度と融解温度の間に少なくとも
２℃以上の差を有する潜熱蓄熱材を使用し、潜熱蓄熱材
への蓄熱を割引料金電力を使用して潜熱蓄熱材の融解温
度あるいは融解温度を上回る温度にて行い、一般料金電
力を床面温度保持に使用して一般料金電力を使用するヒ
ーターへの通電を潜熱蓄熱材の凝固温度に設定して該凝
固温度を上回る時にオフとし、該凝固温度を下回る時に
オンとして制御することを特徴とする蓄熱式電気床暖房
装置に関する。<Means for Solving the Problems> The present invention has been made to achieve the above-mentioned objects, and is a combination of a discounted power and a general power, and is used in a floor or a floor where additional cooking is performed by the general power. In a regenerative electric floor heating device, a latent heat storage material having a difference of at least 2 ° C. or more between a solidification temperature and a melting temperature is used, and the heat stored in the latent heat storage material is melted using a discount charge power. When the temperature is higher than the melting temperature, the general power is used to maintain the floor surface temperature, and the power to the heater that uses the general power is set to the solidification temperature of the latent heat storage material and the solidification temperature is exceeded. The present invention relates to a regenerative electric floor heating device, which is turned off and turned on when the temperature falls below the solidification temperature.
本発明の蓄熱式電気床暖房装置に用いる潜熱蓄熱材と
しては、融解温度と凝固温度の間に２℃以上の差があっ
て、かつ、適切な温度領域に凝固温度を有するものであ
ればとくに限定されない。例えば芒硝あるいは芒硝に第
２成分を配合して得られる芒硝系潜熱蓄熱材を例示する
ことができる。As the latent heat storage material used in the regenerative electric floor heating device of the present invention, a material having a difference of 2 ° C. or more between the melting temperature and the solidification temperature and having a solidification temperature in an appropriate temperature range is particularly preferable. Not limited. For example, sodium sulfate or a sodium sulfate-based latent heat storage material obtained by blending the second component with sodium sulfate can be exemplified.
潜熱蓄熱材への蓄熱は通常夜間に割引料金電力を使用
して融解温度あるいはこれを上回る温度を基準温度とし
て行ない、一般料金電力は床面温度の保持に使用する。
そのために、一般料金電力を使用するヒーターの通電の
制御は潜熱蓄熱材の融解温度以下の凝固温度を基準温度
として設定し、これを上回る場合にはオフとし、これに
等しいかこれを下回る場合にはオンとする。装置のより
具体的な構成は次のとおりである。The heat storage in the latent heat storage material is usually performed at night using the discounted power as the melting temperature or a temperature higher than the melting temperature, and the general power is used for maintaining the floor surface temperature.
Therefore, the control of energization of the heater using the general charge power sets the solidification temperature equal to or lower than the melting temperature of the latent heat storage material as the reference temperature, turns off if it exceeds this, and turns off if it is equal to or less than this Is turned on. The more specific configuration of the device is as follows.
割引料金電力と一般料金電力を併用する床内あるいは
床面蓄熱式電気床暖房装置には、凝固温度と融解温度に
２℃ないし３℃の差を設けた潜熱蓄熱材を使用する。A latent heat storage material having a difference of 2 ° C. to 3 ° C. between the solidification temperature and the melting temperature is used for an in-floor or floor-storage electric floor heating device that uses both discounted electricity and general electricity.
床内あるいは床面蓄熱式電気床暖房装置では、潜熱蓄
熱材の温度を、目的とする温度に均一に保持するために
潜熱蓄熱材を収納する容器の形状を10mmから50mmの厚さ
の板状直方体とし、潜熱蓄熱材を融解するためのヒータ
ーは、潜熱蓄熱板に密着する面状ヒーターか、潜熱蓄熱
板への伝熱が良く均一に配置された線状ヒーターを用い
る。温度の検知は、電熱ヒーターなどの熱源が接する板
状直方体容器の面と相対する面に設けた溝内に密着する
ように取り付けた温度検知器で行うこととする。In floor or floor storage type electric floor heating systems, the shape of the container that stores the latent heat storage material is 10 mm to 50 mm thick to maintain the temperature of the latent heat storage material uniformly at the target temperature. As a rectangular parallelepiped heater for melting the latent heat storage material, a planar heater that is in close contact with the latent heat storage plate or a linear heater that is uniformly arranged with good heat transfer to the latent heat storage plate is used. Temperature detection is performed by a temperature detector attached so as to be tightly fitted in a groove provided on a surface opposite to the surface of the plate-shaped rectangular parallelepiped container in contact with a heat source such as an electric heater.
本発明により、一般料金電力による蓄熱が行われる可
能性を小さくし、割引料金電力を蓄熱に最大限に活用で
きる。また蓄熱材からの放熱による通常暖房時と、「追
い焚き」時の床面温度に差が無いので暖房感に差がな
く、快適な床暖房による室内環境が得られる。Advantageous Effects of Invention According to the present invention, it is possible to reduce the possibility of performing heat storage using ordinary toll power, and to make full use of discount toll power for heat storage. Further, since there is no difference between the floor surface temperature during normal heating by heat radiation from the heat storage material and the floor surface temperature during "reheating", there is no difference in the feeling of heating, and an indoor environment with comfortable floor heating can be obtained.
また床内あるいは床面蓄熱式電気床暖房装置では深夜
間の割引料金電力供給時に床面温度が上がり過ぎないの
で、低温火傷の危険が少なく、床仕上げ材の狂いも起こ
りにくくなる。In addition, in the case of the electric floor heating device in the floor or on the floor heat storage type, the floor surface temperature does not rise excessively at the time of the supply of the discounted electricity at midnight, so that there is less danger of low-temperature burns and the floor finishing material is less likely to be disordered.
潜熱蓄熱板内での蓄熱材の温度のばらつきを小さく
し、潜熱蓄熱材の融解温度と凝固温度の差を検知出来
る。Variations in the temperature of the heat storage material within the latent heat storage plate can be reduced, and the difference between the melting temperature and the solidification temperature of the latent heat storage material can be detected.
＜実施例＞ 実施例として図面を参照して説明すると第１図におい
て、電源（１）には電力種別として業務用電力を供給す
るが、「業務用蓄熱調整契約制度」による割引料金電力
の供給を、午後10時から翌日の午後８時までの夜間10時
間受けるものとする。この割引料金電力を電熱ヒーター
（７）に通電して、蓄熱板（10）の中の潜熱蓄熱材を加
熱し融解させ蓄熱する。潜熱蓄熱材として融解温度が32
℃、凝固温度が30℃の芒硝（Na2SO4・10H2O）を主成分
とする組成物を使用する。<Embodiment> An embodiment will be described with reference to the drawings. In FIG. 1, a power supply (1) is supplied with commercial power as a power type. For 10 hours at night from 10 pm to 8 pm the following day. The electric power is supplied to the electric heater (7) to heat and melt the latent heat storage material in the heat storage plate (10) to store the heat. Melting temperature of 32 as latent heat storage material
A composition mainly composed of sodium sulfate (Na 2 SO 4 .10H 2 O) having a solidification temperature of 30 ° C. and a solidification temperature of 30 ° C. is used.
割引料金電力の通電中は蓄熱板に取り付けられた割引
料金電力用温度検知器（８）で潜熱蓄熱材の温度を検知
し、潜熱蓄熱材の融解温度である32℃を設定温度として
割引料金電力用制御回路（５）により制御し、設定温度
を下回る場合には入力スイッチ（２）をオンに、上回る
場合にはオフとする。制御回路は割引料金電力の供給時
間と同一時間帯に機能するように設定されたタイムスイ
ッチにより入り切りする。While the discounted power is being supplied, the temperature of the latent heat storage material is detected by the discounted power temperature detector (8) attached to the heat storage plate, and the set temperature is set to 32 ° C, the melting temperature of the latent heat storage material. The input switch (2) is turned on when the temperature is lower than the set temperature, and turned off when the temperature is higher than the set temperature. The control circuit is turned on and off by a time switch set to function in the same time zone as the supply time of the discounted power.
割引料金電力の遮断中は、蓄熱板に取り付けられた一
般料金電力用温度検知器（９）で潜熱蓄熱材の温度を検
知し、蓄熱蓄熱材の凝固温度である30℃を設定温度とし
て一般料金電力用制御回路（６）により制御し、設定温
度を下回る場合には入力スイッチ（２）をオンに、上回
る場合にはオフとする。制御回路は割引料金電力の供給
遮断時間と同一時間帯に機能するように設定されたタイ
ムスイッチにより入り切りする。During the interruption of the discounted charge, the temperature of the latent heat storage material is detected by the general charge power temperature detector (9) attached to the heat storage plate, and the set temperature is set at 30 ° C, the solidification temperature of the heat storage material. The power is controlled by the power control circuit (6), and the input switch (2) is turned on when the temperature is lower than the set temperature, and is turned off when the temperature is higher than the set temperature. The control circuit is turned on and off by a time switch set to function in the same time zone as the supply cutoff time of the discounted power.
床暖房装置の敷設の実施例について図面を参照して説
明すると、第２図において、潜熱蓄熱材は上面に電熱縁
（18）を敷設する溝、下面に温度検知器を取り付けるた
めの溝を持った、寸法が幅30cm×長さ60cm×厚さ2.5cm
のポリプロピレン製の板状直方体のブロー成形容器の中
に収納され、潜熱蓄熱板（14）の形で、コンクリート床
（17）の上に敷設された発泡ポリスチレン製の断熱材
（15）の上に敷設される。蓄熱板の枚数は室内の暖房に
必要な放熱面積と、必要とされる蓄熱量によって決め
る。蓄熱板の上面の溝には潜熱蓄熱材の蓄熱に必要な出
力を持った電熱線が敷設される。An embodiment of laying a floor heating device will be described with reference to the drawings. In FIG. 2, the latent heat storage material has a groove for laying an electric heating edge (18) on an upper surface and a groove for attaching a temperature detector on a lower surface. The size is 30cm wide x 60cm long x 2.5cm thick
It is housed in a polypropylene plate-shaped rectangular parallelepiped blow-molded container and in the form of a latent heat storage plate (14), on a foamed polystyrene insulation material (15) laid on a concrete floor (17). Be laid. The number of heat storage plates is determined by the heat radiation area required for indoor heating and the required heat storage amount. A heating wire having an output required for heat storage of the latent heat storage material is laid in the groove on the upper surface of the heat storage plate.
線熱蓄熱板の上面は10mm厚さの繊維強化石膏板を床下
地材（12）として使用し、床仕上げ材（11）はタイルカ
ーペット、塩化ビニール製シートなどを使用する。The upper surface of the linear heat storage plate uses 10 mm thick fiber reinforced gypsum board as a floor covering material (12), and the floor finishing material (11) uses a tile carpet, a vinyl chloride sheet, or the like.
第３図に示される実施例では、線熱蓄熱材は寸法が幅
25cm×長さ60cm×厚さ2.5cmのポリプロピレン製の板状
直方体のブロー成形容器の中に収納し、潜熱蓄熱板（2
0）として、断熱材（19）の上に30.3cm間隔に取り付け
られた根太（22）の間に落し込む形で敷設する。根太の
厚さは蓄熱材の上面と根太の上面が同一面となるような
厚さとする。In the embodiment shown in FIG. 3, the linear heat storage material has a width
It is stored in a 25cm x 60cm x 2.5cm thick polypropylene plate-shaped rectangular blow molded container.
As 0), it is laid so that it falls between the joists (22) attached at intervals of 30.3 cm on the heat insulating material (19). The thickness of the joist is set so that the upper surface of the heat storage material and the upper surface of the joist are flush with each other.
蓄熱板は電熱シート（21）の上に置く形で敷設する。 The heat storage plate is laid on the electric heating sheet (21).
電熱シートへの通電を制御する蓄熱材の温度は蓄熱板
の上面に設けた溝内に取り付けた温度検知器（24）によ
り検知する。The temperature of the heat storage material that controls the energization of the electric heat sheet is detected by a temperature detector (24) mounted in a groove provided on the upper surface of the heat storage plate.
床仕上げ材（18）として木質フローリングを使用す
る。Use wood flooring as floor covering (18).
第１図は割引料金電力と一般料金電力を併用する潜熱蓄
熱式電気床暖房装置の構成概略図、第２図と第３図は温
度検返器の取り付け部分での潜熱蓄熱式床暖房装置の横
断面図である。 （１）……電源、（２）……入力スイッチ、（３）……
割引料金電力用タイムスイッチ、（４）……一般料金電
力用タイムスイッチ、（５）……割引料金電力用制御回
路、（６）……一般料金電力用制御回路、（７）……電
熱ヒーター、（８）……割引料金電力用温度検知器、
（９）……一般料金電力用温度検知器、（10）……蓄熱
板、（11）、（18）……床仕上げ材、（12）……床下地
材、（13）……電熱線、（14）、（20）……潜熱蓄熱
板、（15）、（19）……断熱材、（16）、（24）……温
度検知器、（17）、（23）……コンクリート床、（21）
……電熱シート、（22）……根太FIG. 1 is a schematic diagram of a configuration of a latent heat storage type electric floor heating device using both a discount rate power and a general rate power, and FIGS. 2 and 3 are diagrams of a latent heat storage type floor heating device at a mounting portion of a temperature detector. FIG. (1) Power supply (2) Input switch (3)
Time switch for discounted power, (4) Time switch for general price power, (5) Control circuit for discounted power, (6) Control circuit for general price power, (7) Electric heater , (8)… Temperature detector for discounted electricity
(9)… Temperature detector for general charge electricity, (10)… heat storage plate, (11), (18)… floor finish material, (12)… floor base material, (13)… heating wire , (14), (20) ... latent heat storage plate, (15), (19) ... thermal insulation, (16), (24) ... temperature detector, (17), (23) ... concrete floor ,(twenty one)
...... Electric heating sheet, (22) ... joist
Claims (1)
般料金電力にて追い炊きを行う床内あるいは床面蓄熱式
電気床暖房装置において、凝固温度と融解温度の間に少
なくとも２℃以上の差を有する潜熱蓄熱材を使用し、潜
熱蓄熱材への蓄熱を割引料金電力を使用して潜熱蓄熱材
の融解温度あるいは融解温度を上回る温度にて行い、一
般料金電力を床面温度保持に使用して一般料金電力を使
用するヒーターへの通電を潜熱蓄熱材の凝固温度に設定
して該凝固温度を上回る時にオフとし、該凝固温度を下
回る時にオンとして制御することを特徴とする蓄熱式電
気床暖房装置。1. An in-floor or floor regenerative electric floor heating system in which a discounted electric power and a general electric power are used in combination to perform additional cooking at an ordinary electric power, at least 2 ° C. or more between the solidification temperature and the melting temperature. Using the latent heat storage material having a difference between the two, and using the discounted power to store the heat in the latent heat storage material at the melting temperature of the latent heat storage material or at a temperature higher than the melting temperature. The heat storage type characterized in that the power supply to the heater using the general charge power is set to the solidification temperature of the latent heat storage material and turned off when the temperature exceeds the solidification temperature, and turned on when the temperature falls below the solidification temperature. Electric floor heating system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1152819A JP2653175B2 (en) | 1989-06-14 | 1989-06-14 | Heat storage type electric floor heating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1152819A JP2653175B2 (en) | 1989-06-14 | 1989-06-14 | Heat storage type electric floor heating device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0317438A JPH0317438A (en) | 1991-01-25 |
| JP2653175B2 true JP2653175B2 (en) | 1997-09-10 |
Family
ID=15548849
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1152819A Expired - Lifetime JP2653175B2 (en) | 1989-06-14 | 1989-06-14 | Heat storage type electric floor heating device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2653175B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109114647A (en) * | 2018-08-21 | 2019-01-01 | 镇江裕太防爆电加热器有限公司 | A kind of power plant heat accumulation power generation heating system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01102333U (en) * | 1987-12-28 | 1989-07-11 |
-
1989
- 1989-06-14 JP JP1152819A patent/JP2653175B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0317438A (en) | 1991-01-25 |
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