JPH02203153A - Controlling method of operation of combination type hot-water supplier - Google Patents
Controlling method of operation of combination type hot-water supplierInfo
- Publication number
- JPH02203153A JPH02203153A JP1019622A JP1962289A JPH02203153A JP H02203153 A JPH02203153 A JP H02203153A JP 1019622 A JP1019622 A JP 1019622A JP 1962289 A JP1962289 A JP 1962289A JP H02203153 A JPH02203153 A JP H02203153A
- Authority
- JP
- Japan
- Prior art keywords
- water
- hot water
- flow rate
- hot
- heat exchanger
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 169
- 238000000034 method Methods 0.000 title claims abstract description 8
- 238000001514 detection method Methods 0.000 abstract description 7
- 238000002485 combustion reaction Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000008676 import Effects 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
Landscapes
- Control For Baths (AREA)
- Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
- Domestic Hot-Water Supply Systems And Details Of Heating Systems (AREA)
Abstract
Description
〔産業上の利用分野〕
本発明は、浴室用と台所用との２台の給湯器を連結し、
出湯量が少なくて低号数の場合は一方の給湯器のみを運
転し、出湯量が多くて高号数の場合は双方の給湯器を運
転して浴槽に給湯し得るようにし、さらに、台所側給湯
口の手前には湯水混合のミキシングバルブを備えた連結
式給湯器の運転制御方法に関するものである。
〔従来の技術〕
第３図は連結式給湯器の構成を示す説明図である。この
図において、１００および２００は例えばそれぞれ３．
５号から１６号までの給湯能力を有する浴室用と台所用
の給湯器で、このため、バーナＩＡおよびＩＢには、電
磁弁２Ａ、 ２Ｂ、比例弁３Ａ、 ３Ｂを介してガスが
供給されるように構成されており、後述のマイコン制御
部により制御される。４Ａおよび４Ｂは熱交換器、５Ａ
、５Ｂはファンである。
また、この給湯器に対する給水側には、水量センサー６
Ａ、６Ｂおよび水温可変式の水ガバナ７Ａ。
７Ｂが取付けられていると共に給水温をサーミスタ８に
より検出するように構成されている。また、前記給湯器
１００と給湯器２００の出湯管にはそれぞれサーミスタ
９Ａおよび９Ｂが取付けられていて、出湯温度をそれぞ
れ検出している。浴室用の給湯器１００の出湯管ＩＯは
浴室内の給湯栓（または混合栓）１１に接続され、台所
用の給湯器２００の出湯管は水切替弁１２を介して浴室
用の給湯器の出湯管１０に接続され、さらに、台所用給
湯槽２００の出湯管はギヤモータ１３で温度設定を行な
う湯水混合のミキシングバルブ１４を介して台所側給湯
栓１５に接続されている。１６は前記給湯栓１１に至る
給湯温度を検出するサーミスタ、１７は台所給湯栓を開
くとオンする流水スイッチ、１８Ａは浴室側リモコン、
１８Ｂは台所側リモコン、１９はマイコン制御部で、前
記各サーミスタや水量センサー、流水スイッチなどの信
号に基づいてリモコン１８Ａ、 １８Ｂに設定した湯温
。
湯量の湯が得られるように制御する。なお、前記水温可
変式の水ガバナ７Ａ、７Ｂは、給湯栓１１．１５を絞ら
ずに、どのような水温条件でも一定温度例えば６０℃の
湯が得られるようにするため、例えば水温５℃のとき約
７ｆｔ／＋ｍｉｎ、水温２５℃のとき約１２ａ／ｗｉｎ
に制御するものである。
上記の如く構成した連結式給湯器は、出湯量が少なくて
低号数の場合には、水切替弁１２を閉じて給湯器１００
．２００の何れか一方のみを運転して給湯し、浴槽に対
する湯張り時のような高号数の場合には、双方の給湯器
１００．２００を運転し、かくして例えば約３，５号か
ら３２号までの給湯を行なうことができる。
〔発明が解決しようとするｉｌＭ）
ところで、上記の如き従来の連結式給湯器は、台所側の
給湯栓の開閉および熱交換器４Ｂの流量とは無関係にミ
キシングバルブ１４はリモコンの設定温度位置をとるよ
うになっていた。
このため、例えば、設定温度３６℃、水温２０℃、４Ｂ
側熱交換器の流量３Ｑ／ｗｉｎの場合（要求号数具の最
低号数（３，５号）を下回るので、熱交換器４Ｂから出
る湯温すなわちミキシングバルブ１４に入る湯温が設定
温度以上となり、このため、ミキシングバルブ１４は熱
交換器４Ｂから入る湯量を絞るように作用し、かくして
湯量が絞られると熱交換器側の湯温はさらに上昇し、こ
れによりミキシングバルブ１４は湯量をさらに絞ること
となり、この動作をくり返しているうちに燃焼ＯＦＦの
流量以下となってバーナは消火する。かくして消火する
と、熱交換器４Ｂからは水が出てくることとなり、ミキ
シングバルブ１４は今度は湯側を開ける動作をして水量
が燃焼ＯＮ流量を越えると再度着火し、再び前述と同様
の動作をくり返して出湯温のハンチング現象を来すとい
う問題がある。
本発明は、前記の如き従来技術の問題点を改善し、要求
号数が器具の最低号数より下回っても出湯温がハンチン
グすることのない連結式給湯器の運転制御方法を提供せ
んとするものである。
〔課題を解決するための手段〕
本発明は、前記の如き目的を達成するため、熱交換器４
Ｂの流量によりミキシングバルブの位置をリモコンに設
定された温度位置と湯側全開位置との２通りに制御し１
台所単独使用であって要求号数が器具の最低号数より小
さいときにはミキシングバルブの湯側（熱交換器側）を
全開として湯水混合せず、要求号数が器具の最低号数よ
り大きいときのみリモコンに設定した温度位置とする。
〔作 用〕
本発明は、前記の如く、台所単独使用であって要求号数
が器具の最低号数より小さいときはミキシングバルブを
全開として湯水混合をしないので、前述の如き出湯温の
ハンチングを防止することができ、かつ、要求号数が器
具の最低号数より大きいときにはリモコンの設定温度と
して湯水を混合し、所望の温度の湯を得ることができる
。
〔実施例〕
以下、第３図を参照しながら第１図および第２図につい
て本発明の制御方法を説明する。
電源スィッチをオンし、次いでリモコンの運転スイッチ
をオンすると、ミキシングバルブ１４を湯側（熱交換器
側）を全開とする。この状態で台所側の給湯栓１５を開
くと、流水スイッチ１７がオンし、その流量が器具の運
転に必要な流量に達したことを水量センサー６Ｂが検知
すると、詳細な説明は省略するが給湯器２００が自動的
に運転され、熱交換器４Ｂ側が燃焼する。このとき、水
量センサー６Ｂにより熱交換器４Ｂを流れる流量ＦＳ２
を検出すると共に、サーミスタ８により水温Ｔ ｗ Ｉ
Ｎを検出し、αを計算させる。ここで、αとは。
ただし、ａ：器具の最低号数
’ｒ５ｐ：リモコンの設定温度
’ｒｌｌｌＮ：水温
であって、前記の運転条件において熱交換器に流れる流
量である。
次に、前記の如くして算出された流量αと熱交換器４Ｂ
を流れる流量ＦＳ２とを比較し、流量ＦＳ、がαより大
きいときのみリモコンの設定温度を読み取ってミキシン
グバルブ１４をリモコンの設定温度位置とし、逆に、流
量ＦＳ２がαより小さいときには、他方の熱交換＠４Ａ
側が燃焼中かどうかを判断し、燃焼中ではないときには
ミキシングバルブ１４を湯側全開位置のまま水量センサ
６Ｂによる流量検出およびサーミスタ８による水温検出
を続行する。すなわち１本発明においては、熱交換器４
Ｂの単独使用であって、要求号数が器具の最低号数より
小さいときにはミキシングバルブ１４を湯側全開とし、
要求号数が器具の最低号数より大きいときのみミキシン
グバルブ１４をリモコンに設定された温度位置にする。
このように１本発明においては、要求号数が器具の最低
号数より小さいときには湯水混合せず、ミキシングバル
ブの湯側全開とするので、従来のようなハンチングが生
ずることなく、出湯量が燃焼ＯＦＦの流量となるまで給
湯することができる。
また、浴室側と台所側同時使用時には、第１図に示すよ
うに、ミキシングバルブは台所リモコンの設定温度位置
とし、かつ、４Ｂ側熱交換器の設定温度は４Ａ側熱交換
器と同じくし、４入側熱交換奏の設定温度が高くても台
所側は湯水混合を行なって設定温度を得るようにする。
前記の如くして湯水混合による給湯時にも、水量センサ
６Ｂによる流量検出およびサーミスタ８による給水温検
出を継続して湯側を全開にすべき流量βを演算する。こ
こでβは、
であって、ｂはディファレンシャルである。前記の演算
によって得られた流量βと４Ｂ側熱交換鼎の流量ＦＳ２
とを°常に比較し、ＦＳ２がβより大きいときには湯水
混合による給湯を継続し、βよりＦＳ２が小さくなった
ときには、４Ａ側が燃焼中か否かを判断し、燃焼中では
ないときにはミキシングバルブ１４を湯側全開とし、４
Ａ側燃焼中の場合には湯水混合とする。
すなわち、ミキシングバルブの湯側全開から湯水混合へ
の切替え、および湯水混合から湯側全開への切替えは第
２Ｗｉに示す如くして行なわれる。[Industrial Application Field] The present invention connects two water heaters, one for the bathroom and one for the kitchen,
If the hot water output is low and the number is low, only one water heater is operated, and if the hot water output is large and the number is high, both water heaters are operated to supply hot water to the bathtub. The present invention relates to a method for controlling the operation of a connected water heater equipped with a mixing valve for mixing hot water and water in front of a side water supply port. [Prior Art] FIG. 3 is an explanatory diagram showing the configuration of a connected water heater. In this figure, 100 and 200 are, for example, 3.
This is a water heater for bathrooms and kitchens that has a hot water supply capacity of size 5 to size 16. Therefore, gas is supplied to burners IA and IB via solenoid valves 2A, 2B and proportional valves 3A, 3B. It is configured as follows, and is controlled by a microcomputer control section, which will be described later. 4A and 4B are heat exchangers, 5A
, 5B is a fan. In addition, a water flow sensor 6 is installed on the water supply side of this water heater.
A, 6B and variable temperature water governor 7A. 7B is attached, and the temperature of the water supply is detected by a thermistor 8. Further, thermistors 9A and 9B are attached to the hot water outlet pipes of the water heater 100 and the water heater 200, respectively, to detect the temperature of the hot water. The hot water pipe IO of the water heater 100 for the bathroom is connected to the hot water tap (or mixed tap) 11 in the bathroom, and the hot water pipe of the water heater 200 for the kitchen is connected to the hot water tap of the bathroom water heater via the water selector valve 12. The hot water outlet pipe of the kitchen hot water tank 200 is further connected to the kitchen hot water tap 15 via a mixing valve 14 for mixing hot water and water whose temperature is set by a gear motor 13. 16 is a thermistor that detects the hot water temperature reaching the hot water tap 11; 17 is a running water switch that is turned on when the kitchen hot water tap is opened; 18A is a bathroom remote control;
Reference numeral 18B is a kitchen remote control, and reference numeral 19 is a microcomputer control unit, and the water temperature is set on the remote controllers 18A and 18B based on signals from each thermistor, water flow sensor, water switch, etc. Control so that the amount of hot water is obtained. The variable water temperature type water governors 7A and 7B are designed to provide hot water at a constant temperature, for example, 60°C, under any water temperature conditions, without having to throttle the hot water tap 11.15. When the water temperature is about 7ft/+min, when the water temperature is 25℃, it is about 12a/win.
It is intended to be controlled. In the connected water heater configured as described above, when the amount of hot water output is small and the number of hot water is low, the water switching valve 12 is closed and the water heater 100 is closed.
．． Only one of the water heaters 100 and 200 is operated to supply hot water, and in the case of a high number such as when filling a bathtub, both water heaters 100 and 200 are operated, thus, for example, from about 3.5 to 32 It is possible to supply hot water up to [ILM to be Solved by the Invention] By the way, in the conventional connected water heater as described above, the mixing valve 14 can control the set temperature position of the remote control regardless of the opening/closing of the hot water faucet on the kitchen side and the flow rate of the heat exchanger 4B. I was starting to take it. For this reason, for example, set temperature 36℃, water temperature 20℃, 4B
When the flow rate of the side heat exchanger is 3Q/win (the required number is lower than the minimum number of appliances (3, 5), the hot water temperature coming out of the heat exchanger 4B, that is, the hot water temperature entering the mixing valve 14, is higher than the set temperature. Therefore, the mixing valve 14 acts to throttle the amount of hot water entering from the heat exchanger 4B, and when the amount of hot water is throttled in this way, the temperature of the hot water on the heat exchanger side further increases, and as a result, the mixing valve 14 acts to further reduce the amount of hot water. As this operation is repeated, the flow rate becomes lower than the combustion OFF point and the burner is extinguished.When the burner is extinguished, water comes out from the heat exchanger 4B, and the mixing valve 14 is turned off. There is a problem in that when the side is opened and the water volume exceeds the combustion ON flow rate, ignition occurs again, and the same operation as described above is repeated again, resulting in a hunting phenomenon of the hot water temperature. The purpose of the present invention is to improve the above problems and provide an operation control method for a connected water heater in which the hot water temperature does not hunt even if the required number is lower than the minimum number of the appliance. Means for Achieving] In order to achieve the above objects, the present invention provides a heat exchanger 4
The position of the mixing valve is controlled in two ways according to the flow rate of B: the temperature position set on the remote control and the hot water side fully open position.
When the required number is smaller than the minimum number of the appliance when used only in the kitchen, the hot water side of the mixing valve (heat exchanger side) is fully opened and hot water is not mixed, and only when the required number is greater than the minimum number of the appliance. The temperature position is set on the remote control. [Function] As described above, when the present invention is used only in the kitchen and the required number is smaller than the minimum number of the appliance, the mixing valve is fully opened and hot water is not mixed, so the hunting of the hot water temperature as described above is avoided. If this can be prevented and the required number is greater than the minimum number of the appliance, hot water can be mixed at the temperature set on the remote control to obtain hot water at the desired temperature. [Embodiment] Hereinafter, the control method of the present invention will be explained with reference to FIGS. 1 and 2 while referring to FIG. 3. When the power switch is turned on and then the operation switch of the remote controller is turned on, the mixing valve 14 is fully opened on the hot water side (heat exchanger side). When the hot water faucet 15 on the kitchen side is opened in this state, the water flow switch 17 is turned on, and when the water flow rate sensor 6B detects that the flow rate has reached the flow rate required for operating the appliance, hot water is supplied, although detailed explanation will be omitted. The heat exchanger 200 is automatically operated, and the heat exchanger 4B side is combusted. At this time, the flow rate FS2 flowing through the heat exchanger 4B is determined by the water flow rate sensor 6B.
At the same time, the thermistor 8 detects the water temperature T w I
Detect N and calculate α. Here, what is α? However, a: the minimum number of appliances'r5p: the set temperature of the remote controller'rlllN: water temperature, which is the flow rate flowing into the heat exchanger under the above operating conditions. Next, the flow rate α calculated as described above and the heat exchanger 4B
The temperature set on the remote control is read only when the flow rate FS2 is larger than α, and the mixing valve 14 is set at the temperature set on the remote control. Conversely, when the flow rate FS2 is smaller than α, the temperature of the other side is read. Exchange @4A
If the side is not in combustion, the mixing valve 14 is kept at the fully open position on the hot water side, and the flow rate detection by the water flow rate sensor 6B and the water temperature detection by the thermistor 8 are continued. That is, in the present invention, the heat exchanger 4
When B is used alone and the required number is smaller than the minimum number of the appliance, the mixing valve 14 is fully opened on the hot water side,
Only when the requested number is greater than the minimum number of the appliance, the mixing valve 14 is set to the temperature position set on the remote controller. In this way, in the present invention, when the required number is smaller than the minimum number of the appliance, hot water is not mixed and the mixing valve is fully opened on the hot water side, so hunting does not occur as in the conventional case, and the amount of hot water is increased by combustion. Hot water can be supplied until the flow rate is OFF. In addition, when using the bathroom side and the kitchen side at the same time, as shown in Figure 1, the mixing valve should be at the set temperature position of the kitchen remote control, and the set temperature of the 4B side heat exchanger should be the same as that of the 4A side heat exchanger. 4 Even if the set temperature of the input side heat exchanger is high, the set temperature is obtained by mixing hot water and water on the kitchen side. As described above, even during hot water supply by mixing hot and cold water, the flow rate detection by the water flow rate sensor 6B and the supply water temperature detection by the thermistor 8 are continued to calculate the flow rate β at which the hot water side should be fully opened. Here, β is, and b is a differential. The flow rate β obtained by the above calculation and the flow rate FS2 of the 4B side heat exchanger
When FS2 is larger than β, water supply by mixing hot water is continued, and when FS2 is smaller than β, it is determined whether or not the 4A side is in combustion, and when it is not in combustion, the mixing valve 14 is turned on. Fully open the hot water side, 4
When combustion is in progress on the A side, hot water and water are mixed. That is, switching the mixing valve from fully opening the hot water side to mixing hot water and from mixing the hot water to fully opening the hot water side is performed as shown in the second Wi.
以上述べたように、本発明によれば、低号数から高号数
に至る給湯能力を有する２台の給湯器を併設し、かつ、
その一方の給湯器の出湯管をリモコンで制御される湯水
混合のミキシングバルブを介して給湯すべくなした連結
しき給湯器において、要求号数が器具の最低号数を下回
る場合の給湯のハンチングを防止して円滑な給湯を行な
うことができる効果がある。As described above, according to the present invention, two water heaters having hot water supply capacities ranging from a low number to a high number are installed together, and
In the case of connected water heaters in which hot water is supplied through the hot water outlet pipe of one of the water heaters via a mixing valve for mixing hot water and cold water controlled by a remote control, hot water supply hunting occurs when the required number is lower than the minimum number of appliances. This has the effect of preventing this problem and ensuring smooth hot water supply.
第１図は本発明による運転制御方法を示すフローチャー
ト、第２図はミキシングバルブ切替の説明図、第３図は
適用すべき給湯器の一例を示す器具の概要図である。
ＩＡ、 ＩＢ・・・バーナ、２Ａ、 ２Ｂ・・・電磁弁
、３Ａ。
３Ｂ・・・比例弁、４Ａ、 ４Ｂ・・・熱交換器、 ５
Ａ、 ５Ｂ・・・ファン、６Ａ、 ６Ｂ・・・水量セン
サ、７Ａ、 ７Ｂ・・・水ガバナ、８・・・水温検知サ
ーミスタ、 ９Ａ、 ９Ｂ、 １６・・・サーミスタ、
１０・・・出湯管、ｘｉ、 ｔｓ・・・給湯栓、１２・
・・水切替弁、 １３・・・モータ、１４・・・ミキシ
ングバルブ。
１７・・・流水スイッチ、１８Ａ、 １８Ｂ・・・リモ
コン。
特許出願人 株式会社ガスター
代理人弁理士 秋 本 正 実
（外１名）
第
図
ＴｓＰ −Ｔｗ ＩＭ
→Ｂ側懸交攻量
ａ 号数
Ｔｓｐ”投勧１贋
Ｔｗｌ Ｎ ： Ａ（’Ａ
ｂ：テ１み）ンヤνし
ＦＳ２’９ イ」禰！１コ；セ；；交、ｉｆ手続補正書
輸釦FIG. 1 is a flowchart showing the operation control method according to the present invention, FIG. 2 is an explanatory diagram of mixing valve switching, and FIG. 3 is a schematic diagram of a device showing an example of a water heater to which the present invention is applied. IA, IB... Burner, 2A, 2B... Solenoid valve, 3A. 3B...Proportional valve, 4A, 4B...Heat exchanger, 5
A, 5B...Fan, 6A, 6B...Water flow sensor, 7A, 7B...Water governor, 8...Water temperature detection thermistor, 9A, 9B, 16...Thermistor,
10... hot water pipe, xi, ts... hot water tap, 12.
...Water switching valve, 13...Motor, 14...Mixing valve. 17...Water switch, 18A, 18B...Remote control. Patent Applicant Gaster Co., Ltd. Patent Attorney Masami Akimoto (1 other person) Diagram TsP -Tw IM → B-side engagement attack amount a No. Tsp” 1 False Twl N: A('A b: te1mi) nyaνshi FS2'9 i'ne! 1.C;C;C;IF Procedure Amendment Form Import Button
Claims (1)
湯器を併設し、その一方の給湯器の出湯管に他方の給湯
器の給湯管を水切替弁を介して接続し、１台の給湯器の
能力範囲のときには前記水切替弁を閉じて何れか一方の
給湯器のみを運転し、１台の給湯器の能力を越えるとき
には水切替弁を開いて双方の給湯器を運転して給湯すべ
くなし、かつ、前記他方の給湯器の出湯管をリモコンで
制御される湯水混合のミキシングバルブを介して給湯栓
に接続している連結式給湯器において、前記ミキシング
バルブを、前記他方の給湯器の熱交換器を流れる流量に
より、リモコンに設定された温度位置と湯側全開位置と
の２通りに制御し、他方の給湯器の単独使用であって要
求号数が器具の最低号数より小さいときにはミキシング
バルブの熱交換器側を全開として湯水混合せず、要求号
数が器具の最低号数より大きいときのみリモコンに設定
した温度位置とすることを特徴とする連結式給湯器の運
転制御方法。1. Two water heaters with hot water supply capacities ranging from low to high numbers are installed together, and the hot water pipe of one water heater is connected to the hot water pipe of the other water heater via a water switching valve. When the capacity of one water heater is within the range, the water switching valve is closed and only one of the water heaters is operated; when the capacity of one water heater is exceeded, the water switching valve is opened and both water heaters are operated. In a connected water heater, in which the hot water outlet pipe of the other water heater is connected to the hot water faucet via a mixing valve for mixing hot water and cold water controlled by a remote control, the mixing valve is connected to the hot water supply tap. The flow rate flowing through the heat exchanger of the other water heater is controlled in two ways: the temperature position set on the remote control and the hot water side fully open position, and when the other water heater is used alone, the required number is the lowest of the equipment. When the required number is smaller than the minimum number of the appliance, the heat exchanger side of the mixing valve is fully opened and hot water is not mixed, and only when the requested number is greater than the minimum number of the appliance, the temperature position is set on the remote control. operation control method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1019622A JPH07122513B2 (en) | 1989-01-31 | 1989-01-31 | Operation control method for linked water heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1019622A JPH07122513B2 (en) | 1989-01-31 | 1989-01-31 | Operation control method for linked water heater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02203153A true JPH02203153A (en) | 1990-08-13 |
| JPH07122513B2 JPH07122513B2 (en) | 1995-12-25 |
Family
ID=12004290
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1019622A Expired - Fee Related JPH07122513B2 (en) | 1989-01-31 | 1989-01-31 | Operation control method for linked water heater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07122513B2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6227526A (en) * | 1985-07-26 | 1987-02-05 | Kobe Steel Ltd | Pretreatment of starting material for sintering |
| JPS63273757A (en) * | 1987-05-01 | 1988-11-10 | Noritsu Co Ltd | Large capacity hot water maker of parallel type |
-
1989
- 1989-01-31 JP JP1019622A patent/JPH07122513B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6227526A (en) * | 1985-07-26 | 1987-02-05 | Kobe Steel Ltd | Pretreatment of starting material for sintering |
| JPS63273757A (en) * | 1987-05-01 | 1988-11-10 | Noritsu Co Ltd | Large capacity hot water maker of parallel type |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07122513B2 (en) | 1995-12-25 |
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