JPH0355165B2 - - Google Patents
Info
- Publication number
- JPH0355165B2 JPH0355165B2 JP61307718A JP30771886A JPH0355165B2 JP H0355165 B2 JPH0355165 B2 JP H0355165B2 JP 61307718 A JP61307718 A JP 61307718A JP 30771886 A JP30771886 A JP 30771886A JP H0355165 B2 JPH0355165 B2 JP H0355165B2
- Authority
- JP
- Japan
- Prior art keywords
- water level
- speed
- liquid level
- container
- low
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 54
- 239000007788 liquid Substances 0.000 claims description 49
- 239000000463 material Substances 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 12
- 238000007872 degassing Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000009849 vacuum degassing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/0042—Degasification of liquids modifying the liquid flow
- B01D19/0052—Degasification of liquids modifying the liquid flow in rotating vessels, vessels containing movable parts or in which centrifugal movement is caused
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Degasification And Air Bubble Elimination (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、真空装置によつて真空に保たれた容
器に外部から取扱液つまり材料を供給し、該容器
内で材料中に含まれる気体を排除するようにした
脱気装置に関し、特に該脱気装置における容器内
の取扱液の液面レベルの制御方法に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention involves supplying a handling liquid or material from the outside to a container kept in a vacuum by a vacuum device, and discharging the gas contained in the material within the container. The present invention relates to a degassing device that eliminates water, and more particularly to a method of controlling the liquid level of a handled liquid in a container in the degassing device.
従来、真空容器の中に取扱液つまり材料を入
れ、該容器内で回転する分配機の遠心力を利用し
て材料中の空気を排除するようにした真空脱気装
置は、第５図に示すように、容器１内が予め真空
ポンプ等の真空装置２によつて真空状態にあり、
材料が供給管３から供給されるようになつてお
り、該容器１内では、駆動機４により、その軸端
に取付けられた通常ふるい等からなる分配機５が
回転している。
Conventionally, a vacuum deaerator is shown in Fig. 5, in which the liquid to be handled, ie, the material, is placed in a vacuum container, and the air in the material is removed using the centrifugal force of a distributor rotating within the container. As shown, the inside of the container 1 is in a vacuum state in advance by a vacuum device 2 such as a vacuum pump,
Material is supplied from a supply pipe 3, and within the container 1, a driver 4 rotates a distributor 5, which usually consists of a sieve or the like attached to the end of its shaft.
上記供給管３から投入された材料（取扱液）
は、分配機５の遠心力により飛ばされて容器１の
内面に薄膜状に形成され、該薄膜状の材料の表面
から真空による脱気作用が行なわれる。そして脱
気された処理済液は、容器１の低部に溜まり、排
出ポンプからなる排出装置６によつて外部へ排出
されるようになつている。なお、図中、７は排出
装置６の駆動機、８は該駆動機７の制御盤であ
る。 Materials (handling liquid) introduced from the above supply pipe 3
is blown away by the centrifugal force of the distributor 5 and is formed in a thin film on the inner surface of the container 1, and the surface of the thin film is degassed by vacuum. The degassed treated liquid is collected in the lower part of the container 1 and is discharged to the outside by a discharge device 6 consisting of a discharge pump. In addition, in the figure, 7 is a drive machine of the discharge device 6, and 8 is a control panel of the drive machine 7.
上記の作用を連続的に行なうためには、取扱液
を容器内に滞留させることなく排出するために、
低水位Ｌを検知する液面レベル計LLと、高水位
Ｈを検知する液面レベル計LHと、上限水位を検
知する液面レベル計LAの３個の液面レベル計が
取付けられ、運転時、低水位Ｌと高水位Ｈとの間
でON−OFF運転され、何らかの原因で高水位Ｈ
を上まわつた時は、液面レベル計LAの働きによ
り、分配機５を停止して材料の供給を停止してい
た。 In order to perform the above action continuously, in order to discharge the handled liquid without stagnation in the container,
Three liquid level gauges are installed: liquid level gauge LL to detect low water level L, liquid level gauge LH to detect high water level H, and liquid level gauge LA to detect upper limit water level. , is operated ON-OFF between low water level L and high water level H, and for some reason the high water level H
When the level exceeded the level, the liquid level meter LA stopped the distributor 5 and stopped the supply of material.
一般に、脱気装置の液面レベル制御には、次の
５項目が要求される。
Generally, the following five items are required for liquid level control in a deaerator.
真空中の暴露時間を長くして脱気効果を高め
るために、なるべく低い液面レベルでの運転が
好ましい。 In order to increase the degassing effect by increasing the exposure time in vacuum, it is preferable to operate at the lowest possible liquid level.
次工程を考慮し、断続運転でなく連続運転で
あること。 Considering the next process, the operation should be continuous rather than intermittent.
排出ポンプが空運転にならないこと。 Make sure the discharge pump does not run dry.
分配機に容器内の処理済液が触れる前に、該
分配機を停止して材料の供給を停止すること。 Before the dispenser comes into contact with the treated liquid in the container, the dispenser is stopped and the supply of material is stopped.
高粘度液を考慮し、液面レベル計は簡単なも
ので最少の本数であること。 Considering high viscosity liquids, liquid level meters should be simple and have a minimum number.
ところが、上記した従来の脱気装置では、高水
位検知の液面レベル計LHでの運転が必須である
ため、上記の項目を満足させることができず、
また、低水位Ｌと高水位Ｈ間でのON−OFF運転
であることから、の項目も同様に満足させるこ
とができず、また連続運転にするべく“低速”・
“中速”・“高速”を設定するためには、各々を液
面レベルに対応させるため更に１本の液面レベル
計が必要で、そのための項目にも反することに
なる。 However, with the conventional deaerator described above, it is necessary to operate with a liquid level meter LH that detects a high water level, so the above items cannot be satisfied.
In addition, since the operation is ON-OFF between the low water level L and the high water level H, it is not possible to satisfy the above criteria as well, and in order to achieve continuous operation, the "low speed"
In order to set "medium speed" and "high speed", one more liquid level meter is required to correspond to each liquid level, which also violates the item for that purpose.
このように、従来のON−OFF制御では、上記
の要求を満たし得ないという問題点があつた。 As described above, the conventional ON-OFF control has the problem of not being able to satisfy the above requirements.
他方、連続運転に最適な方法として、第６図に
示すような超音波を用いた方法も考えられる。こ
の方法は容器１内の液面レベルを超音波発生機９
より発射される超音波の往復の時間差によつて検
知し、制御盤８を介して排出装置６の駆動機７を
制御しようとするものである。 On the other hand, as a method most suitable for continuous operation, a method using ultrasonic waves as shown in FIG. 6 can also be considered. This method uses an ultrasonic generator 9 to measure the liquid level in the container 1.
This is to detect the time difference between the reciprocating times of the ultrasonic waves emitted from the ultrasonic waves, and to control the driving machine 7 of the ejecting device 6 via the control panel 8.
ところが、一般に超音波発生機は雰囲気が真空
中では作用しないので、真空脱気装置における容
器１には採用できない。 However, since the ultrasonic generator generally does not work in a vacuum atmosphere, it cannot be used in the container 1 of the vacuum degassing device.
本発明は、前記した五つの要求項目をすべて満
足する安価な液面制御方法を提供することを技術
的課題としている。 The technical object of the present invention is to provide an inexpensive liquid level control method that satisfies all of the above five requirements.
本発明は、上記した従来技術の問題点及び技術
的課題を解決するために、真空に保たれた容器内
で外部から供給された材料中に含まれる気体を排
除するようにした脱気装置において、低水位Ｌを
検知する液面レベル計と高水位Ｈを検知する液面
レベル計とを上記容器に取付け、高速、中速、低
速の３段階に選択可能な可変速駆動機により運転
される排出ポンプを備え、通常は低水位Ｌと高水
位Ｈの間で中速で運転するように設定しておき、
水位（レベル）がＨ以上になると高速で運転し、
タイマーによる時間Ｘの後、水位がＨ以上の場合
は材料の供給を停止し、Ｈ以下に復帰している時
は中速で運転し、また水位がＬ以下になつた時は
低速で運転し、タイマーにより時間Ｙの後に水位
がＬ以下の場合は該排出ポンプを停止し、水位が
Ｌ以上に復帰している場合は中速で運転するよう
に制御することを特徴としている。
In order to solve the problems and technical problems of the prior art described above, the present invention provides a deaerator that eliminates gas contained in a material supplied from the outside in a container kept in vacuum. A liquid level meter that detects a low water level L and a liquid level meter that detects a high water level H are attached to the container, and are operated by a variable speed drive machine that can be selected from three speeds: high speed, medium speed, and low speed. It is equipped with a discharge pump and is normally set to operate at a medium speed between low water level L and high water level H.
When the water level is higher than H, it will operate at high speed.
After time X according to the timer, if the water level is H or higher, the material supply will be stopped, if the water level has returned to H or lower, it will operate at medium speed, and if the water level has fallen to L or lower, it will operate at low speed. If the water level is below L after time Y by a timer, the discharge pump is stopped, and when the water level has returned to above L, the pump is controlled to operate at medium speed.
次に、本発明の実施例を図面と共に説明する。 Next, embodiments of the present invention will be described with reference to the drawings.
第１図は、本発明にかかる脱気装置の液面制御
方法を実施する制御装置の説明図であり、図中、
第５図に記載した符号と同一の符号は同一ないし
同類部分を示すものとする。 FIG. 1 is an explanatory diagram of a control device that implements the liquid level control method for a deaerator according to the present invention, and in the figure,
The same reference numerals as those shown in FIG. 5 indicate the same or similar parts.
図において、LLは、真空装置２によつて真空
に保たれ且つ内部に分配機５を有する容器１の底
部近くに取付けられた、低水位Ｌを検知する液面
レベル計、LHは上記LLより上方に取付けられた
高水位Ｈを検知する液面レベル計である。これら
両レベル計LL、LHと排出ポンプ１６の駆動機１
７とに接続された制御盤１８の内部には、第２図
に示す運転フローを実現するための液面リレータ
イマーや、排出ポンプ１６の回転数設定器等が図
示しないが内蔵されている。 In the figure, LL is a liquid level meter that detects a low water level L, which is installed near the bottom of a container 1 that is kept in a vacuum by a vacuum device 2 and has a distributor 5 inside, and LH is from LL above. This is a liquid level meter installed above to detect the high water level H. Drive machine 1 for both level meters LL and LH and discharge pump 16
Inside the control panel 18 connected to the pump 7, there are built-in a liquid level relay timer, a rotation speed setting device for the discharge pump 16, etc. (not shown) for realizing the operation flow shown in FIG.
排出ポンプ１６は、可変速モータ１７に接続さ
れており、“低速”・“中速”・“高速”の３段階に
選択できるように設定されている。この速度の設
定は、材料の供給量と排出ポンプ１６の排出量が
バランスするように、“中速”に設定し、液面レ
ベルＬ以下の容器容量VLを仮に10秒程度で排出
するような排出ポンプ１６の回転数を“低速”と
し、同様に、液面レベルＨ以上の容器容量VHを
仮に10秒程度で排出するような排出ポンプの回転
数を“高速”と設定する。 The discharge pump 16 is connected to a variable speed motor 17, and is set to be selectable from three stages: "low speed", "medium speed", and "high speed". This speed is set to "medium speed" so that the amount of material supplied and the amount of discharge from the discharge pump 16 are balanced, and the container volume V L below the liquid level L is temporarily discharged in about 10 seconds. The rotational speed of the discharge pump 16 is set as "low speed", and similarly, the rotational speed of the discharge pump is set as "high speed" so that the volume V H of the container above the liquid level H can be discharged in about 10 seconds.
次に、第２図の運転フローの用いて、本発明に
よる液面制御方法を説明する。 Next, the liquid level control method according to the present invention will be explained using the operation flow shown in FIG.
装置が運転され、材料が投入されると、容器１
内の液面が上昇し、液面レベルＬを上まわると、
排出ポンプ１６は“中速”でスタートする。本来
この回転数は供給量に見合つた排出量を得られる
ように設定されているので、水位（レベル）Ｌ付
近で、つまり低水位で連続運転される。 When the device is operated and the material is loaded, container 1
When the liquid level inside rises and exceeds the liquid level L,
The discharge pump 16 starts at "medium speed". Originally, this rotational speed is set so as to obtain a discharge amount commensurate with the supply amount, so it is continuously operated near the water level (level) L, that is, at a low water level.
しかし、供給量には若干のバラツキがあるの
で、もし供給量が定格値を上まわる場合は、液面
レベルが高水位Ｈに到達し、この時排出ポンプ１
６は“高速”となり、供給量の増加に追随する。 However, since there is some variation in the supply amount, if the supply amount exceeds the rated value, the liquid level will reach the high water level H, and at this time the discharge pump 1
6 is "high speed" and follows the increase in supply amount.
“高速”に切換わると同時にタイマーが作動
し、時間“Ｘ”の後にチエツクがあり、相変らず
高水位Ｈ以上にある時は、“高速”でもまかなえ
ない程の過剰供給量と判断し、分配機５に液面が
触れる前に該分配機５を停止し、併せて材料の供
給を停止する。 At the same time as switching to "high speed", the timer operates, and there is a check after time "X", and if the water is still above the high water level H, it is determined that there is an excess supply that cannot be covered even with "high speed". The distributor 5 is stopped before the liquid surface touches the distributor 5, and the supply of material is also stopped.
水位が高水位Ｈ以下で低水位Ｌ以上の時は、最
適範囲にあるとの判断で“中速”に戻す。 When the water level is below the high water level H and above the low water level L, it is determined that the speed is within the optimum range and the speed is returned to "medium speed".
供給量が少ない方に推移した場合は、液面レベ
ルが低水位Ｌを下まわる。この時は排出ホンプ１
６の回転数が“低速”となり、供給量の減少に追
随する。 When the supply amount shifts to a smaller level, the liquid level falls below the low water level L. At this time, the discharge pump 1
The rotation speed of 6 becomes "low speed" and follows the decrease in the supply amount.
“低速”に切換わると同時にタイマーが作動
し、時間“Ｙ”の後に再びチエツクがあり、相変
らず低水位Ｌ以下にある時は、“低速”でも過大
すぎる程の過少供給量と判断し、排出ポンプ１６
が空運転する前に該排出ポンプ１６を停止する。 At the same time as switching to "low speed", the timer operates, and after time "Y" there is a check again. If the water level is still below the low water level L, it is determined that the supply amount is so low that even "low speed" is too large. , discharge pump 16
The discharge pump 16 is stopped before it runs dry.
水位が低水位Ｌ以上に復帰している時は、最適
範囲であるとの判断で“中速”に戻す。 When the water level has returned to the low water level L or above, it is determined that the speed is within the optimum range and the speed is returned to "medium speed".
なお、上記した制御装置において、排出ポンプ
１６は容器内に溜つた処理済液を排出するもので
あれば、どのような型式のものでもよいことは勿
論である。 In the above-described control device, it goes without saying that the discharge pump 16 may be of any type as long as it discharges the treated liquid accumulated in the container.
第３図及び第４図は、本発明による脱気装置の
液面制御方法の動力・制御のシーケンス図の一例
を示すものである。 FIGS. 3 and 4 show an example of a power/control sequence diagram of the liquid level control method for a deaerator according to the present invention.
図において、ARは変速制御機構、CTは変流
器、ELBは漏電ブレーカ、INVはインバータ、
MCBはノーヒユーズブレーカ、Ｍはモータ、
MGSはマグネチツクセンサー、Ｐはパイロツト
モータ、PBLは押ボタンスイツチ、RPMは回転
計、RXは補助リレー、VRはボリユーム抵抗、
８８−１，４Ｒは電磁接触器、８８−２〜４は電
磁開閉器を示す。なお、上記両図において各ステ
ツプはシーケンサの指示による。 In the figure, AR is the speed change control mechanism, CT is the current transformer, ELB is the earth leakage breaker, INV is the inverter,
MCB is a no-fuse breaker, M is a motor,
MGS is a magnetic sensor, P is a pilot motor, PBL is a push button switch, RPM is a tachometer, RX is an auxiliary relay, VR is a volume resistor,
88-1 and 4R indicate electromagnetic contactors, and 88-2 to 4 indicate electromagnetic switches. In both figures above, each step is based on instructions from the sequencer.
以上説明したように、本発明によれば、脱気装
置の容器の低水位Ｌと高水位Ｈをそれぞれ検知す
る２個の液面レベル計を取付け、高速、中速、低
速の３段階に選択可能な可変速駆動機により運転
される排出ポンプを、通常は低水位Ｌと高水位Ｈ
の間で運転させるように設定し、２個のタイマー
により一定時間経過後の水位の変化を検知して、
材料の供給又は排出ポンプの停止を含めて回転数
の選択措置をとるようにしたことにより、通常は
定格処理量つまり材料の供給量に見合う排出ポン
プ回転数（中速）で運転され、このバランスがく
ずれた時にも供給量が定格値を上まわつた時は排
出ホンフが“高速”に、下まわつた時には“低
速”に切り替わることによつて、供給量の変化に
対応し、且つタイマーにより或る時間後にチエツ
クして危険と判断すれば、供給や排出を停止し、
さもなければ正常と判断して再び“中速”に戻す
という、変化に対応した運転が可能となる。
As explained above, according to the present invention, two liquid level gauges are installed to respectively detect the low water level L and high water level H of the container of the deaerator, and three levels of high speed, medium speed, and low speed can be selected. A discharge pump operated by a variable speed drive capable of
It is set to operate between
By taking measures to select the rotation speed, including stopping the material supply or discharge pump, the discharge pump is normally operated at a rotation speed (medium speed) that corresponds to the rated throughput, that is, the amount of material supplied, and this balance is maintained. Even when the supply volume collapses, the discharge honf switches to "high speed" when the supply volume exceeds the rated value, and to "low speed" when the supply volume falls below the rated value. If it is determined to be dangerous after a certain period of time, the supply or discharge will be stopped.
Otherwise, it is possible to operate in response to changes by determining that it is normal and returning to "medium speed" again.
上記のように、低速、中速、高速の３段階の回
転数設定を有する変速モータ付きポンプと、低水
位検知用及び高水位検知用の２個の液面レベル計
及び２個のタイマーという簡単な機器の組合わせ
により、前記した脱気装置の液面レベル制御に要
求される五つの項目を総べて満足する液面制御を
行なうことができる。 As mentioned above, it is simple, consisting of a pump with a variable speed motor that has three speed settings (low speed, medium speed, high speed), two liquid level gauges for low water level detection and high water level detection, and two timers. By combining various devices, it is possible to perform liquid level control that satisfies all of the five items required for liquid level control in a deaerator.
第１図は本発明による脱気装置の液面制御方法
を実施する制御装置の一例を示す説明図、第２図
は同液面制御方法の運転フロー、第３図及び第４
図は同動力・制御のシーケンス図、第５図及び第
６図は従来例に関する説明図である。
１……容器、２……真空装置、３……供給管、
４……駆動機、５……分配機、１６……排出ポン
プ、１７……駆動モータ、１８……制御盤、LH
……高水位検知液面レベル計、LL……低水位検
知液面レベル計。
FIG. 1 is an explanatory diagram showing an example of a control device implementing the liquid level control method for a deaerator according to the present invention, FIG. 2 is an operational flow of the same liquid level control method, and FIGS.
The figure is a sequence diagram of simultaneous power and control, and FIGS. 5 and 6 are explanatory diagrams regarding the conventional example. 1... Container, 2... Vacuum device, 3... Supply pipe,
4...Driver, 5...Distributor, 16...Discharge pump, 17...Drive motor, 18...Control panel, LH
...High water level detection liquid level meter, LL...Low water level detection liquid level meter.
Claims (1)
から材料を供給し、該容器内で材料中に含まれる
気体を排除するようにした脱気装置において、低
水位Ｌを検知する液面レベル計と高水位Ｈを検知
する液面レベル計とを上記容器に取付け、高速、
中速、低速の３段階に選択可能な可変速駆動機に
より運転される排出ポンプを備え、通常は低水位
Ｌと高水位Ｈの間で運転するように設定してお
き、水位が高水位Ｈ以上になると高速で運転し、
タイマーによる時間Ｘの後、水位が高水位Ｈ以上
の場合は材料の供給を停止し、高水位Ｈ以下に復
帰している時は中速で運転し、また水位が低水位
Ｌ以下になつた時は低速で運転し、タイマーによ
り時間Ｙの後に水位が低水位Ｌ以下の場合は排出
ポンプを停止し、水位が低水位Ｌ以上に復帰して
いる場合は中速で運転するように制御することを
特徴とする脱気装置の液面制御方法。1 In a degassing device that supplies material from the outside to a container kept in a vacuum by a vacuum device and removes the gas contained in the material within the container, the liquid level that detects the low water level L A liquid level meter that detects high water level H is attached to the above container, and high-speed,
It is equipped with a discharge pump operated by a variable speed drive machine that can be selected from three speeds, medium speed and low speed, and is normally set to operate between a low water level L and a high water level H. If it is higher than that, drive at high speed,
After time X according to the timer, if the water level is above the high water level H, the material supply will be stopped, and if it has returned to below the high water level H, it will operate at medium speed, and when the water level has fallen below the low water level L. If the water level is below the low water level L after time Y, the discharge pump will be stopped, and if the water level has returned to the low water level L or higher, the pump will be operated at a medium speed. A method for controlling a liquid level in a deaerator, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30771886A JPS63162005A (en) | 1986-12-25 | 1986-12-25 | Method for controlling liquid level in deaerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30771886A JPS63162005A (en) | 1986-12-25 | 1986-12-25 | Method for controlling liquid level in deaerator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63162005A JPS63162005A (en) | 1988-07-05 |
| JPH0355165B2 true JPH0355165B2 (en) | 1991-08-22 |
Family
ID=17972409
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30771886A Granted JPS63162005A (en) | 1986-12-25 | 1986-12-25 | Method for controlling liquid level in deaerator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63162005A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2623156B2 (en) * | 1990-04-26 | 1997-06-25 | 富士写真フイルム株式会社 | Replenisher replenisher for photosensitive lithographic printing plate processing equipment |
| US20220203267A1 (en) | 2019-04-09 | 2022-06-30 | M. Technique Co., Ltd. | Vacuum deaerator equipped with refining device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56167011A (en) * | 1980-05-23 | 1981-12-22 | Suekichi Hayakawa | Snow removing apparatus automatically changing water scattering amount |
| JPS57207911A (en) * | 1981-06-17 | 1982-12-20 | Toshiba Corp | Controlling method of water pump |
-
1986
- 1986-12-25 JP JP30771886A patent/JPS63162005A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56167011A (en) * | 1980-05-23 | 1981-12-22 | Suekichi Hayakawa | Snow removing apparatus automatically changing water scattering amount |
| JPS57207911A (en) * | 1981-06-17 | 1982-12-20 | Toshiba Corp | Controlling method of water pump |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63162005A (en) | 1988-07-05 |
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