JPH0128804Y2 - - Google Patents
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- Publication number
- JPH0128804Y2 JPH0128804Y2 JP17499984U JP17499984U JPH0128804Y2 JP H0128804 Y2 JPH0128804 Y2 JP H0128804Y2 JP 17499984 U JP17499984 U JP 17499984U JP 17499984 U JP17499984 U JP 17499984U JP H0128804 Y2 JPH0128804 Y2 JP H0128804Y2
- Authority
- JP
- Japan
- Prior art keywords
- water
- housing
- valve
- pressure
- filter
- 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
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 85
- 238000011001 backwashing Methods 0.000 claims description 28
- 238000004140 cleaning Methods 0.000 claims description 24
- 238000001914 filtration Methods 0.000 claims description 13
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 239000007787 solid Substances 0.000 description 8
- 239000007788 liquid Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 239000002699 waste material Substances 0.000 description 5
- 238000007796 conventional method Methods 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 239000008394 flocculating agent Substances 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Description
【考案の詳細な説明】
（産業上の利用分野）
本考案は懸濁物質過装置の改良に係わり、逆
洗操作可能なフイルタによる過装置一般に利用
して有利であり、原子力施設等における廃水処理
にも有利に応用できる懸濁物質の過装置に関す
る。[Detailed description of the invention] (Field of industrial application) The present invention relates to the improvement of suspended solids filtration equipment, and is advantageous for general use in filtration equipment with filters that can be backwashed, and is useful for wastewater treatment in nuclear facilities, etc. The present invention relates to a device for filtering suspended solids which can be advantageously applied to the present invention.
（従来の技術）
水溶液中の懸濁物質（Suspended Solid以下SS
と略す）を除去する一般的な方法として、薬品
（無機系凝集剤、高分子凝集剤等）添加による凝
集沈殿処理、加圧浮上処理また低汚濁液での砂
過処理、凝集過処理等があるが、現在では上記
処理方法に代り、過方式逆洗方式の異なつたフ
イルタ式過装置が低汚濁水のSS除去に採用さ
れつつある。(Conventional technology) Suspended solid (SS) in an aqueous solution
Common methods for removing these substances include coagulation-sedimentation treatment by adding chemicals (inorganic flocculants, polymer flocculants, etc.), pressure flotation treatment, sand filter treatment with low-pollution liquid, coagulation over-treatment, etc. However, in place of the above-mentioned treatment method, a different type of filter-type filtration device with a filtration type backwashing type is now being adopted for removing SS from low-pollution water.
従来のフイルタ式過装置の概要を第３図に基
き説明する。 An outline of a conventional filter type filtration device will be explained based on FIG. 3.
〔過運転〕バルブ１および２を開とし、ポンプ
３を運転し、原水タンク７中の原水をフイルタ１
１を通過させて出口２１へと通水することにより
過を行なう。原水中のSSはフイルタ１１によ
つて捕集される。フイルタ１１の圧力損失を差圧
計２３にて検出し、所定値となれば、バルブ１お
よび２を閉とし、ポンプ３の運転を停止する。[Over-operation] Open valves 1 and 2, operate pump 3, and drain raw water in raw water tank 7 through filter 1.
The filtration is carried out by passing water through 1 to the outlet 21. SS in the raw water is collected by a filter 11. The pressure loss of the filter 11 is detected by the differential pressure gauge 23, and when it reaches a predetermined value, the valves 1 and 2 are closed and the operation of the pump 3 is stopped.
〔水抜き工程〕バルブ４を開とした後に、バルブ
５を開とし、低圧気体源２２より低圧（約２〜５
Kg／cm2Ｇ程度）の気体を導入し加圧することによ
りハウジング６内の水を原水タンク７へ戻す。水
を抜き終れば、バルブ４および５を閉とし、バル
ブ８を開とする。[Water removal process] After opening the valve 4, the valve 5 is opened, and the low pressure (approximately 2 to 5
The water in the housing 6 is returned to the raw water tank 7 by introducing and pressurizing gas (approximately Kg/cm 2 G). After draining the water, valves 4 and 5 are closed and valve 8 is opened.
〔逆洗工程〕アキユムレータ９に約10〜25Kg／cm2
Ｇ程度の気体を蓄えておき、バルブ１０を開と
し、該気体を噴出させて、フイルター上部の水２
４とともにフイルタ１１を高圧逆洗し、フイルタ
１１に付着したSSをはく離し、逆洗廃液タンク
１２へと排出する。[Backwashing process] Approximately 10 to 25 kg/cm 2 to accumulator 9
G of gas is stored, and the valve 10 is opened to blow out the gas and remove the water 2 at the top of the filter.
4, the filter 11 is backwashed under high pressure, the SS adhering to the filter 11 is peeled off, and the SS is discharged into the backwash waste liquid tank 12.
以上により高圧逆洗が終了すると、バルブ８お
よび１０を閉とし、バルブ１および２を開とした
後ポンプ３を運転して、過を再開する。 When the high-pressure backwashing is completed as described above, the valves 8 and 10 are closed, the valves 1 and 2 are opened, and the pump 3 is operated to restart the flushing.
（考案が解決しようとする問題点）
以上従来装置での過・高圧逆洗につき概要を
述べたが、高圧逆洗時に次に示すような欠点があ
る。(Problems to be Solved by the Invention) An overview of over- and high-pressure backwashing in conventional devices has been described above, but there are the following drawbacks during high-pressure backwashing.
(1) 高圧逆洗によりフイルタ１１よりSSをはく
離させるが、そのSSがすべては排出されず、
ハウジング６の内壁面に２５のごとく付着して
系統内に残留する。従つて、高圧逆洗後原水を
再通水した時、系統内に残留した付着SS25が
通水初期時フイルタ−１１表面に再付着し、
過面積を減少させ、初期フイルタ−差圧を上昇
させるため所定圧力損失までの全通水量の低下
をまねく。(1) High-pressure backwashing removes SS from filter 11, but not all of the SS is discharged.
It adheres to the inner wall surface of the housing 6 as shown in 25 and remains in the system. Therefore, when the raw water is re-flowed after high-pressure backwashing, the adhered SS25 remaining in the system re-adheres to the surface of the filter 11 at the initial stage of water flow.
This reduces the excess area and increases the initial filter differential pressure, leading to a decrease in the total water flow rate up to a predetermined pressure loss.
(2) ハウジング６壁面等系統内に残留した付着
SS25を系外へ排出する目的で高圧逆洗を連続
して実施した場合、通水量（逆洗から逆洗ま
で）は増加するが、高圧逆洗廃液量の増加をま
ねくため、過装置による水回収率が悪くな
る。(2) Adhesion remaining on the housing 6 wall surface, etc.
If high-pressure backwashing is performed continuously for the purpose of discharging SS25 out of the system, the amount of water flowing (from backwashing to backwashing) will increase, but this will lead to an increase in the amount of high-pressure backwashing waste liquid. Recovery rate will be poor.
本考案の目的は、従来装置の欠点に鑑み、高圧
逆洗時にハウジング６壁面等系内に付着したSS
をより効率よく系外に排出することにより、フイ
ルタ装置への通水量および水回収率の増加を計つ
た改良された懸濁物質過装置を提供することに
ある。 In view of the shortcomings of conventional devices, the purpose of this invention is to prevent SS from adhering to the inside of the system, such as the wall surface of the housing 6, during high-pressure backwashing.
An object of the present invention is to provide an improved suspended solids filtration device that increases the amount of water passed through the filter device and the water recovery rate by more efficiently discharging the suspended solids from the system.
（問題点を解決するための手段）
本考案者らは、上記従来装置に用いた高圧逆洗
水の1/3〜1/2量の水で、従来と同様の高圧逆洗を
実施した後、残りの1/2〜2/3量の水でハウジング
６壁面等系内に付着残留したSS25を射水方式に
より効率よく除去することを考え、本考案の装置
に到達した。(Means for solving the problem) The inventors of the present invention discovered that after performing high-pressure backwashing in the same manner as conventional methods using 1/3 to 1/2 the amount of water used in the conventional device, The idea was to use the remaining 1/2 to 2/3 amount of water to efficiently remove SS25 remaining on the wall surface of the housing 6 and other parts of the system using a water injection method, and the device of the present invention was developed.
すなわち、本考案は原水をハウジング内のフイ
ルタにて過する手段、低圧水にて上記ハウジン
グ内の水抜きを行う手段および上記ハウジング内
を高圧逆洗する手段を有する過装置において、
バルブを介し過水出口ラインと連通しかつ上部
に空気抜きバルブを有する洗浄用水タンク、該洗
浄用水タンク水量に応じ上記バルブを制御する手
段、該洗浄用水タンクと上記低圧水の水源とをバ
ルブを介して連通し、低圧水により洗浄水を押し
出す手段、および該洗浄用水タンク下方とバルブ
を介して連通しハウジング上部の内側壁面の接線
方向に出口を下方に向けて設置された洗浄水噴射
ノズルを有してなる懸濁物質過装置である。 That is, the present invention provides a filtration device having means for passing raw water through a filter in the housing, means for draining water from the housing using low-pressure water, and means for high-pressure backwashing the inside of the housing.
A cleaning water tank that communicates with the excess water outlet line through a valve and has an air release valve at the top, means for controlling the valve according to the amount of water in the cleaning water tank, and connecting the cleaning water tank and the low-pressure water source through the valve. means for pushing out cleaning water using low-pressure water, and a cleaning water injection nozzle that communicates with the lower part of the cleaning water tank via a valve and is installed with its outlet facing downward in the tangential direction of the inner wall surface of the upper part of the housing. This is a suspended solids filtration device.
以下、本考案の装置を図面により詳細に説明す
る。第１図は本考案の１実施態様を概略説明する
図である。第３図の従来装置におけると同符号の
部分は、同様の構成を意味し、本考案の装置では
従来の構成に加えて、過工程のバルブ２上流側
から分岐するラインとバルブ１５を介して連通
し、高圧逆洗後、低圧水にて洗浄を行なうための
水を保有する洗浄用水タンク１３、および該洗浄
用水タンク１３の水を導入してハウジング６内を
洗浄するための洗浄用噴射ノズル１４が設けられ
ている。 Hereinafter, the apparatus of the present invention will be explained in detail with reference to the drawings. FIG. 1 is a diagram schematically explaining one embodiment of the present invention. The parts with the same reference numerals as those in the conventional device in FIG. A cleaning water tank 13 holding water for cleaning with low-pressure water after high-pressure backwashing, and a cleaning injection nozzle for introducing water from the cleaning water tank 13 to clean the inside of the housing 6. 14 are provided.
なお、噴射ノズル１４はハウジング６壁面最上
部に、壁面に対し接線方向に、ノズル口を下向に
設置する。第２図はハウジング６上部の噴射ノズ
ル１４とフイルター１１の位置関係を説明するハ
ウジング６上部の断面図である。 The injection nozzle 14 is installed at the top of the wall surface of the housing 6 in a tangential direction to the wall surface, with the nozzle opening facing downward. FIG. 2 is a sectional view of the upper part of the housing 6, illustrating the positional relationship between the injection nozzle 14 and the filter 11 in the upper part of the housing 6.
本考案の装置では、まずバルブ１および２を開
とし、ポンプ３を運転して原水７を過するが、
この時にバルブ１５および１６を開とし、過操
作中の過水を洗浄用水タンク１３に保有させ、
所定量の洗浄水を保有すればレベル計２６の信号
によりバルブ１５および１６を閉とする。なおバ
ルブ１６は用水タンク１３への水張り時の空気抜
き用である。バルブ１，２を閉とし、バルブ４お
よび５を開として、前述したように低圧気体源２
２からの気体により、ハウジング６内の水２４を
原水タンク７へ戻し水抜きした後、バルブ４およ
び５を閉じる。次いでバルブ８を開とし、バルブ
１０を開としてアキユムレータ９の高圧気体によ
り、高圧逆洗を行うが、この時の水量は従来法で
の1/3〜1/2量とする。なお高圧逆洗の水量調節は
ハウジング６の上部に取付けた出口配管２１の取
付位置を調整し、フイルタ上部にホールドする水
量を1/3〜1/2にすることで可能である。 In the device of the present invention, valves 1 and 2 are first opened, and the pump 3 is operated to pass the raw water 7.
At this time, the valves 15 and 16 are opened to store excess water during over-operation in the cleaning water tank 13,
When a predetermined amount of cleaning water is retained, the valves 15 and 16 are closed by a signal from the level meter 26. Note that the valve 16 is for venting air when filling the water tank 13 with water. With valves 1 and 2 closed and valves 4 and 5 open, low pressure gas source 2 is activated as described above.
After the water 24 in the housing 6 is returned to the raw water tank 7 and drained by the gas from the housing 2, the valves 4 and 5 are closed. Next, the valve 8 and the valve 10 are opened to perform high-pressure backwashing with high-pressure gas from the accumulator 9, but the amount of water at this time is 1/3 to 1/2 the amount in the conventional method. The amount of water for high-pressure backwashing can be adjusted by adjusting the mounting position of the outlet pipe 21 attached to the upper part of the housing 6 and reducing the amount of water held above the filter to 1/3 to 1/2.
従来の高圧逆洗を少量（従来の1/3〜1/2）の水
で行なうことで、フイルター１１に付着したSS
をハウジング−６の壁面に付着させるにとどめる
ことができる。 By performing conventional high-pressure backwashing with a small amount of water (1/3 to 1/2 of the conventional amount), the SS attached to the filter 11 can be removed.
can be simply attached to the wall surface of the housing-6.
高圧逆洗終了後、バルブ１７および１８を開と
し、バルブ１７より低圧ガスを洗浄用水タンク１
３に導入することにより噴射ノズル１４に洗浄水
を送りこむ。この洗浄水量は従来の1/2〜2/3量と
する。 After high-pressure backwashing is completed, valves 17 and 18 are opened, and low-pressure gas is supplied from valve 17 to the cleaning water tank 1.
3, the cleaning water is sent to the injection nozzle 14. The amount of washing water should be 1/2 to 2/3 of the conventional amount.
低圧ガス（２〜５Kg／cm2Ｇ）で噴射ノズル１４
に押し出された洗浄水は噴射ノズル１４によりハ
ウジング−６壁面にそつて噴射され、ハウジング
６壁面を旋回しながら全面を均一に流れることに
より、ハウジング６壁面に付着したSS25を有効
に系外へ排出する。 Inject nozzle 14 with low pressure gas (2~5Kg/cm 2 G)
The flushing water pushed out is sprayed along the wall of the housing 6 by the spray nozzle 14, and flows uniformly over the entire surface while swirling around the wall of the housing 6, effectively discharging SS25 adhering to the wall of the housing 6 out of the system. do.
従つて全逆洗水量は従来法と大差なく、また通
水量およびフイルタ装置での水回収率の増加、逆
洗廃液量の減容化が行なえる。噴射ノズル１４か
らの水の流れはハウジング６壁面を旋回しながら
流れ落ちるため、少量の水によつてもハウジング
６壁面全面に行きわたるため、付着しているSS
を有効に除去し系外に排出できる。洗浄用水タン
ク１３の保有水は過水であるため噴射ノズル１
４のつまり等は起らない。 Therefore, the total amount of backwash water is not much different from the conventional method, and the amount of water passed and the water recovery rate in the filter device can be increased, and the amount of backwash waste liquid can be reduced. The flow of water from the injection nozzle 14 flows down the wall surface of the housing 6 while swirling, so even a small amount of water spreads over the entire wall surface of the housing 6, thereby removing the attached SS.
can be effectively removed and discharged from the system. Since the water in the cleaning water tank 13 is overflowing, the injection nozzle 1
4. No clogging etc. will occur.
なお、本考案装置に用いる低圧気体源及び高圧
気体源としては例えば圧縮空気、N2ガス等を用
いることができる。 Note that compressed air, N2 gas, etc. can be used as the low-pressure gas source and high-pressure gas source used in the device of the present invention.
（実施例）
第１図の構成の本考案装置について、懸濁物質
を過したときのフイルタの圧力損失を差圧で検
出し、所定値（2.5Kg／cm2）になれば逆洗（一回
洗浄）を行う性能試験を行つた結果を、第４図に
示す。第４図は通水過時間（Hr）とフイルタ
圧力損失（Kg／cm2）の関係を示すグラフで、矢印
は逆洗を示す（実施例）。(Example) Regarding the device of the present invention having the configuration shown in Fig. 1, the pressure loss of the filter when passing through suspended solids is detected by differential pressure, and when it reaches a predetermined value (2.5 kg/cm 2 ), backwashing is performed. Figure 4 shows the results of a performance test in which multiple cleanings were performed. FIG. 4 is a graph showing the relationship between water passage time (Hr) and filter pressure loss (Kg/cm 2 ), and the arrow indicates backwashing (Example).
また第３図の従来装置について上記と同様に性
能試験を行つた結果を第５図に同様に示す（比較
例）。 Further, the results of a performance test conducted on the conventional device shown in FIG. 3 in the same manner as above are shown in FIG. 5 (comparative example).
比較例では逆洗後のフイルターの圧力損失が通
水−洗浄を繰返すにしたがい逆洗後の圧力損失が
上昇し、またノバツチごとの通水時間も短縮して
いき、洗浄のひん度が増加する一方となる。 In the comparative example, the pressure loss of the filter after backwashing increases as the water flow and washing are repeated, and the water flow time for each batch decreases, resulting in an increase in the frequency of washing. Become one.
一方本考案の実施例では逆洗後のフイルター圧
力損失は、初期の値にほぼ回復し通水−逆洗のサ
イクルはほぼ一定時間となる。 On the other hand, in the embodiment of the present invention, the filter pressure loss after backwashing almost recovers to its initial value, and the water flow-backwash cycle takes about a constant time.
この結果から同一通水量時間において、従来装
置に比較して本考案装置では、約半分の逆洗回数
となり、１回当りの逆洗廃液量は同じであるが、
通水量あたりにすれば本装置によれば半量ですむ
という良好な結果となり、逆洗ひん度の低下によ
り、圧縮ガスの消費量の低減もはかれることが明
らかである。 These results show that for the same amount of water flow time, compared to the conventional device, the number of times of backwashing is approximately half that of the device of the present invention, and the amount of backwashing waste liquid per time is the same.
In terms of the amount of water flowed, this device has good results in that only half the amount is required, and it is clear that by reducing the frequency of backwashing, the amount of compressed gas consumed can also be reduced.
（考案の効果）
本考案の懸濁物質過装置では、１回逆洗当り
の逆洗廃液水量は従来法と変らないが、系内に付
着残留したSSは効率よく、系外に排出されるの
で逆洗回数は約1/2となり、圧縮ガス消費量も低
減できる。またフイルタ装置への通水量が安定
し、水回収率が増加する。(Effects of the invention) With the suspended solids filtration device of the present invention, the amount of backwash waste water per backwash is the same as the conventional method, but the SS remaining inside the system is efficiently discharged to the outside of the system. Therefore, the number of times of backwashing is reduced to approximately 1/2, and compressed gas consumption can also be reduced. Additionally, the amount of water flowing to the filter device is stabilized, increasing the water recovery rate.
したがつて装置容量、処理コスト、所要時間等
において従来装置に比し大いに有利である。 Therefore, it is much more advantageous than conventional devices in terms of device capacity, processing cost, required time, etc.
第１図は本考案の装置の１実施態様を説明する
図、第２図は第１図におけるハウジング６内のフ
イルタ１１と洗浄水噴射ノズル１４の位置関係を
示す断面図、第３図は従来装置の説明図である。
１および２……バルブ、３……ポンプ、４およ
び５……バルブ、６……ハウジング、７……原水
タンク、８……バルブ、９……アキユムレータ、
１０……バルブ、１１……フイルタ、１２……逆
洗廃液タンク、１３……洗浄用水タンク、１４…
…洗浄用噴射ノズル、１５および１６……バル
ブ、１７および１８……バルブ、２１……出口、
２２……低圧気体源、２３……差圧計、２４……
フイルタ上部の水、２５……付着SS、２６……
レベル計、第４図および第５図は、実施例および
比較例の性能試験結果を示すグラフで、縦軸はフ
イルタ圧力損失（Kg／cm2）、横軸は通水過時間
（Hr）である。
FIG. 1 is a diagram illustrating one embodiment of the device of the present invention, FIG. 2 is a sectional view showing the positional relationship between the filter 11 in the housing 6 and the cleaning water injection nozzle 14 in FIG. 1, and FIG. 3 is a conventional FIG. 2 is an explanatory diagram of the device. 1 and 2... Valve, 3... Pump, 4 and 5... Valve, 6... Housing, 7... Raw water tank, 8... Valve, 9... Accumulator,
10...Valve, 11...Filter, 12...Backwash waste liquid tank, 13...Washing water tank, 14...
...Cleaning injection nozzle, 15 and 16...Valve, 17 and 18...Valve, 21...Outlet,
22...Low pressure gas source, 23...Differential pressure gauge, 24...
Water on top of filter, 25... Adhering SS, 26...
Level meter, Figures 4 and 5 are graphs showing the performance test results of Examples and Comparative Examples, where the vertical axis is filter pressure loss (Kg/cm 2 ) and the horizontal axis is water passage time (Hr). be.
Claims (1)
段、低圧水にて上記ハウジング内の水抜きを行う
手段および上記ハウジング内を高圧逆洗する手段
を有する過装置において、バルブを介し過水
出口ラインと連通しかつ上部に空気抜きバルブを
有する洗浄用水タンク、該洗浄用水タンク水量に
応じ上記バルブを制御する手段、該洗浄用水タン
クと上記低圧水の水源とをバルブを介して連通
し、低圧水により洗浄水を押し出す手段、および
該洗浄用水タンク下方とバルブを介して連通しハ
ウジング上部の内側壁面の接線方向に出口を下方
に向けて設置された洗浄水噴射ノズルを有してな
る懸濁物質過装置。 A filtration device having means for passing raw water through a filter in a housing, means for draining water from the housing with low pressure water, and means for high pressure backwashing of the inside of the housing, which communicates with a filtration outlet line through a valve. and a cleaning water tank having an air release valve at the top, a means for controlling the valve according to the amount of water in the cleaning water tank, and communicating the cleaning water tank and the low-pressure water source through the valve to supply cleaning water with the low-pressure water. and a cleaning water injection nozzle that communicates with the lower part of the cleaning water tank via a valve and is installed with its outlet facing downward in the tangential direction of the inner wall surface of the upper part of the housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17499984U JPH0128804Y2 (en) | 1984-11-20 | 1984-11-20 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17499984U JPH0128804Y2 (en) | 1984-11-20 | 1984-11-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6191312U JPS6191312U (en) | 1986-06-13 |
| JPH0128804Y2 true JPH0128804Y2 (en) | 1989-09-01 |
Family
ID=30732606
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17499984U Expired JPH0128804Y2 (en) | 1984-11-20 | 1984-11-20 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0128804Y2 (en) |
-
1984
- 1984-11-20 JP JP17499984U patent/JPH0128804Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6191312U (en) | 1986-06-13 |
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