JPS603129B2 - High heat blast rice husk combustion furnace equipment - Google Patents
High heat blast rice husk combustion furnace equipmentInfo
- Publication number
- JPS603129B2 JPS603129B2 JP13137780A JP13137780A JPS603129B2 JP S603129 B2 JPS603129 B2 JP S603129B2 JP 13137780 A JP13137780 A JP 13137780A JP 13137780 A JP13137780 A JP 13137780A JP S603129 B2 JPS603129 B2 JP S603129B2
- Authority
- JP
- Japan
- Prior art keywords
- cylinder
- furnace body
- double
- air
- rostol
- 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
Links
Landscapes
- Solid-Fuel Combustion (AREA)
- Gasification And Melting Of Waste (AREA)
- Air Supply (AREA)
Description
【発明の詳細な説明】
本発明は、モミガラを燃料とする燃焼炉装置に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a combustion furnace device that uses rice husk as fuel.
近年、石油価格の高騰により施設園芸生産物の生産費の
中にしめる燃料費が大きな負担となっているもので、施
設野菜を安定した状態で市場に供給するためには、石油
エネルギーに替る省エネルギー型の暖房機が嘱望されて
いるものである。In recent years, due to the rise in oil prices, the fuel costs included in the production costs of greenhouse horticulture products have become a major burden.In order to stably supply greenhouse vegetables to the market, energy-saving alternatives to petroleum energy are needed. This heater is highly desired.
本発明は、上記諸点を勘案して農産廃棄物であるモミガ
ラを上部のホッパーより二重密閉円筒を利用した炉筒内
へ落下させると共に炉筒外周部に設けた空気室より高温
加熱、与圧した高圧熱風を送風しながらモミガラを燃焼
させる様になした燃焼炉であって、炉内でモミガラを短
時間で高温化して完全燃焼させ、モミガラの炉内への投
入並びに高温高圧空気の噴射に大きな動力を要すること
なく、モミガラを効率的に燃焼させながら高温燃焼ガス
を得ることを特徴とするものである。以下、実施例図に
より本発明の構成を説明する。上下端間隔を密閉すると
共に縦仕切りで区分して4組の空気室la,lb,lc
,ldを外周に設けた二重密閉炉体2を形成し、該二重
密閉炉体2の外面において各空気室の下部位置に空気取
入口3a,3b,3c,3dを蓮通させると共に、各空
気室の上部位置において二重密閉炉体2の内外面に運通
した孔を関孔し、中心にノズル軸孔4を関孔すると共に
後端寄り下面に嵐量調節穴5を関孔した管体6内に風量
調節穴5と運速する風量調節穴5′をノズル孔7に蓮通
させたノズル軸8を管体6の後端よりノズル軸孔4内に
鉄挿してキャップを競着させたベンチュリ一瞥9を形成
し、各空気室の上部位置の孔にベンチュリー管9a,9
b,9c,9dを外面より内面へと貫通固定して風量調
節穴5,5′を空気室と蓮通させると共にベンチュリー
管の先端を炉体内面より突出させ、二重密閉炉体2の上
端内周面に縁板10を水平に突設し、該緑板10の上面
に接合用二重リング11を突毅し、外周面に多数の孔を
関孔した第1保温円筒12を二重密閉炉体2内に挿入し
、中央位置を切断13させた第1ロストル14を第1保
温円筒12の上端に載着し、第1保温円筒12内周面の
中央高さ位置と下端寄り位置に受け部を設けて第2ロス
トル14′と第3ロストル14^とを支架し、第2ロス
トル14′と第3ロストル14″の間隔において第1保
温円筒12より小径の第2保温円筒12′を挿入して第
3ロストル14″に載設させ、中央位置に孔16を関孔
した円板より成る保熱体16の下面より脚17を突設し
、該保熱体16を第2ロストルー4′に戦設して第1ロ
ストルー4と保熱体16とを適当間隔をおいて対向させ
、第1保温円筒12の側面上方位置に火炎口18を関口
し、二重密閉炉体2の側面上部位置より点火筒19を内
面へと運速させて火炎口18と対向させ、点火筒19の
下方位置において空気取入口20を二重密閉炉体2の外
面より内面へと蓮通させると共に反対側において排煙口
21を同じく蓮通させ、二重密閉炉体2の外径と同一径
の筒体22の下端寄り内面に中央に受□23を閉口した
支持板24を固定し、モミガラの流下面積を規制する漏
斗25を筒体22内に挿入して漏斗25の下端部を受口
23に受着させ、支持板24下面に接合用二重リン11
′を突穀させた漏斗円筒26を二重密閉炉体2の上面に
戦着させ、適当高中の支持枠27の上面中央位置に円筒
28を固締し、該円筒28の正面と背面にストッパー2
9を突設し、円筒28の下端外面に鉄合する継手円筒3
0の上端にストッパー29に係着するL型溝31を設け
て円筒28に継手円筒30を鉄係させ、支持枠27の下
端の台村27の上面中央位置に底部にスクリューコンベ
ヤを設けた灰出装置32を設置し、該灰出装置32の上
面に二重密閉炉体2を載設し、二重密閉炉体2上面の漏
斗円筒26の上端を継手円筒30内に舷合させ、支持枠
27の上端に4組のコンブレスサー33を吊下してコン
ブレスサーより延長した高圧ホース34を対応した空気
取入口に蓮通させた高圧送風モミガラ燃焼炉装置35を
構成すべくなして成るものである。Taking the above points into consideration, the present invention has been developed to drop rice husk, which is agricultural waste, from an upper hopper into a furnace cylinder using a double-sealed cylinder, and to heat it at a high temperature and pressurize it from an air chamber provided on the outer periphery of the furnace cylinder. This is a combustion furnace that burns rice husk while blowing high-pressure hot air.The rice husk is heated to high temperature in a short time and completely combusted in the furnace. It is characterized by producing high-temperature combustion gas while efficiently burning rice husk without requiring a large amount of power. Hereinafter, the configuration of the present invention will be explained with reference to embodiment figures. The space between the upper and lower ends is sealed and divided by vertical partitions to create 4 sets of air chambers la, lb, and lc.
. At the upper part of each air chamber, holes extending through the inner and outer surfaces of the double sealed furnace body 2 were installed, and a nozzle shaft hole 4 was installed in the center, and a storm volume adjustment hole 5 was installed on the lower surface near the rear end. The nozzle shaft 8, which has the air volume adjustment hole 5 and the air velocity adjustment hole 5' passed through the nozzle hole 7 in the pipe body 6, is inserted into the nozzle shaft hole 4 from the rear end of the pipe body 6, and the cap is inserted. A Venturi pipe 9 is formed in the upper part of each air chamber, and a Venturi tube 9a, 9 is inserted into the hole at the upper position of each air chamber.
b, 9c, and 9d are penetrated and fixed from the outer surface to the inner surface, and the air volume adjustment holes 5, 5' are communicated with the air chamber, and the tip of the Venturi tube is made to protrude from the inner surface of the furnace body, and the upper end of the double-sealed furnace body 2 is fixed. An edge plate 10 is horizontally protruded from the inner peripheral surface, a double bonding ring 11 is protruded from the upper surface of the green plate 10, and a first heat-insulating cylinder 12 with a large number of holes on the outer peripheral surface is double-layered. The first rostol 14 inserted into the closed furnace body 2 and cut 13 at the center position is placed on the upper end of the first heat retention cylinder 12, and the center height position and the lower end position of the inner peripheral surface of the first heat retention cylinder 12 are set. A receiving part is provided in the 2nd heating cylinder 12' to support the second heating cylinder 14' and the third heating cylinder 14^, and the second heating cylinder 12' having a diameter smaller than that of the first heating cylinder 12 is provided in the space between the second heating cylinder 14' and the third heating cylinder 14''. is inserted into the third lost route 14'', legs 17 are provided protruding from the lower surface of the heat retaining body 16 made of a disc with a hole 16 in the center position, and the heat retaining body 16 is placed on the second lost route. 4' so that the first lost throughput 4 and the heat insulating body 16 face each other at an appropriate interval, and the flame port 18 is placed above the side surface of the first heat insulating cylinder 12. The ignition tube 19 is moved toward the inner surface from the upper side position to face the flame port 18, and at the lower position of the ignition tube 19, the air intake port 20 is passed from the outer surface to the inner surface of the double sealed furnace body 2. On the other side, the smoke exhaust port 21 is passed through in the same way, and a support plate 24 with a closed receiving hole 23 in the center is fixed to the inner surface near the lower end of the cylinder body 22, which has the same diameter as the outer diameter of the double-sealed furnace body 2. A funnel 25 for regulating the flow area is inserted into the cylindrical body 22, the lower end of the funnel 25 is received in the socket 23, and a joining double ring 11 is placed on the lower surface of the support plate 24.
A funnel cylinder 26 which has been threshed is fixed on the upper surface of the double-closed furnace body 2, and a cylinder 28 is fixed at the center of the upper surface of the support frame 27 of a suitable height, and stoppers are installed on the front and back of the cylinder 28. 2
9 is protruded, and the joint cylinder 3 is iron-fitted to the outer surface of the lower end of the cylinder 28.
An L-shaped groove 31 that engages with a stopper 29 is provided at the upper end of 0, and a joint cylinder 30 is attached to the cylinder 28, and a screw conveyor is provided at the bottom at the center of the upper surface of the stand 27 at the lower end of the support frame 27. The extraction device 32 is installed, the double-sealed furnace body 2 is mounted on the upper surface of the ash extraction device 32, and the upper end of the funnel cylinder 26 on the upper surface of the double-sealed furnace body 2 is fitted into the joint cylinder 30 and supported. It is constructed to constitute a high-pressure blast rice husk combustion furnace device 35 in which four sets of combreathers 33 are suspended from the upper end of the frame 27, and high-pressure hoses 34 extended from the combreathers are passed through corresponding air intake ports. .
尚、図中36はモミガラ収容ホツパ−、37は熱交換器
を示す。つぎに、実施例図により本発明の作用効果を説
明する。In the figure, numeral 36 indicates a rice hull accommodating hopper, and numeral 37 indicates a heat exchanger. Next, the effects of the present invention will be explained with reference to embodiment figures.
本発明になる高圧送風モミガラ燃焼炉装置35は支持枠
27の上面中央位置に設けた円筒28に円筒ホツパーを
継手したモミガラ収容ホツパー36を組設し、該モミガ
ラ収容ホッパー36内に所用量のモミガラを投入して堆
積させ、漏斗円筒26より二重密閉炉体2内へモミガラ
を落下させながら燃豚させるものであり、支持枠27の
上端に装着した各コンブレスサー33を起動して二重密
閉炉体2の外周の4組の空気室la,lb,lc,ld
の下端に低圧空気を送給すると、送給された空気は空気
室内を上昇してノズル軸8の回転により噴射空気量を適
当に調整された各ベンチュリー管9a,9b,9c,9
dより第1保温円筒12内の保熱体16と第1ロストル
14との間隔へ放射対称に噴射されるもので、同時に点
火筒19よりバーナでもつて火炎を噴射すると保熱体1
6と第1保温円筒12とが赤熱され、第1ロストル14
の間隔より保熱体16の上面へ落下したモミガラは着火
燃焼しながら燃焼を持続し、保熱体16の中央孔並びに
第1保温円筒12との間隔より第2ロストル14′へ落
下し、更に第3ロストル14″と落下しながら燃焼する
もので、燃焼が進行するに従って二重密閉炉体2の内筒
が同時に赤熱されて各空気室la,lb,lc,ldが
加熱されることにより、各コンブレスサーで空気室内に
送給された低圧空気は直ちに高温化して膨張し、空気室
内で高温加熱、与圧された空気は高圧熱風となって各ベ
ンチュリー瞥9a,90,9c,9dより噴射されてモ
ミガラの着火燃焼を促進させるものである。二重密閉炉
体2内の燃焼ガスは自然負圧でもつて排煙口21より熱
交換器37等へ排出させて熱交換させ、温風や温水を得
るものであり、温風や温水の温度、或いは排煙口21の
燃焼ガスの温度をセンサーで検出し、設定値以上に温度
が上昇したら点火筒19に設けたバーナの火炎を停止さ
せると共に各空気室に運速させた4組のコンブレスサー
33を制御して各ベンチュリー管9a,9b,9c,9
dより噴射される空気量を調節したり、或いはベンチュ
リ一管の中で対向したベンチュリー管9a,gbとベン
チュリー管9c,9dとを1対としてコンブレスサーを
ON、OFF制御して第1保温円筒12内への高圧熱風
の噴射を制御させながら炉内の燃焼ガスの相対的な燃焼
温度調整をなすものである。二重密閉炉体2内を落下し
て燃焼したモミガラの燃焼灰は下段の第3ロストル14
″より灰出装置32へと落下して楠集された後にコンベ
ヤーでもつて炉外へ連続排出されるもので、第1、第2
、第3ロストル14,14′,14^は中央に切断13
を設けて高熱によるロストルの線膨張を吸収してロスト
ル間隙のひずみを防止出来るものある。The high-pressure blast rice husk combustion furnace device 35 according to the present invention includes a rice husk storage hopper 36 in which a cylindrical hopper is connected to a cylinder 28 provided at the center of the upper surface of a support frame 27, and a required amount of rice husks is placed in the rice husk storage hopper 36. The rice husks are dropped from the funnel cylinder 26 into the double-sealed furnace body 2 while being burnt, and each combustor 33 attached to the upper end of the support frame 27 is activated to start the double-sealed furnace. Four sets of air chambers la, lb, lc, ld around the outer periphery of the body 2
When low-pressure air is fed to the lower end, the fed air rises in the air chamber and is connected to each venturi tube 9a, 9b, 9c, 9 whose injection air amount is adjusted appropriately by rotation of the nozzle shaft 8.
d, the flame is injected radially symmetrically to the space between the heat retainer 16 in the first heat retaining cylinder 12 and the first rostre 14. At the same time, when the flame is injected from the ignition tube 19 with a burner, the heat retainer 1
6 and the first heating cylinder 12 are heated to red heat, and the first heating cylinder 14
The rice husk that fell onto the upper surface of the heat insulating body 16 through the interval continues to ignite and burn, and falls into the second roaster 14' through the gap between the center hole of the heat insulating body 16 and the first heat insulating cylinder 12, and further. It burns while falling with the third rostre 14'', and as the combustion progresses, the inner cylinder of the double-sealed furnace body 2 is simultaneously heated and the air chambers la, lb, lc, and ld are heated. The low-pressure air sent into the air chamber by each combustor immediately becomes high temperature and expands, and the high-temperature heated and pressurized air in the air chamber becomes high-pressure hot air and is injected from each venturi valve 9a, 90, 9c, and 9d. The combustion gas in the double-sealed furnace body 2 is discharged from the smoke exhaust port 21 to the heat exchanger 37 etc. under natural negative pressure for heat exchange, and is heated by hot air and hot water. A sensor detects the temperature of hot air or hot water, or the temperature of combustion gas at the smoke exhaust port 21, and when the temperature rises above a set value, the flame of the burner installed in the ignition tube 19 is stopped, and Each Venturi tube 9a, 9b, 9c, 9
The amount of air injected from d is adjusted, or the venturi tubes 9a, gb and venturi tubes 9c, 9d, which face each other in one venturi tube, are turned on and off by controlling the combustor as a pair. The relative combustion temperature of the combustion gas inside the furnace is adjusted by controlling the injection of high-pressure hot air into the furnace. The combustion ash of rice husk that fell and burned inside the double sealed furnace body 2 is stored in the third roaster 14 in the lower stage.
After falling into the ash extraction device 32 and being collected, the ash is continuously discharged outside the furnace using a conveyor.
, the third rostle 14, 14', 14^ is cut in the center 13
There are some types that can absorb the linear expansion of the rostle due to high heat and prevent distortion of the rostle gap.
支持枠27の上端の円筒28に係着した継手円筒30を
脱係して下方へスライドさせることにより漏斗円筒26
の取替え、或いは二重密閉炉体2の取外し清掃も容易に
なし得るものであり、モミガラの自然落下を利用し、し
かも、低圧送風した空気を炉体外周に設けた空気室で高
温加熱、与圧しながら高圧熱風として噴射させ、モミガ
ラを効率的に燃焼させ得るものであり、モミガラの燃焼
炉内への供V給や高圧熱風の噴射、並びに灰出しのため
に大きな動力を必要とすることなく、農産廃棄物として
のモミガラを安価に利用しながら高温燃焼させて熱交換
のためのエネルギーを取り出し得る等、前記した様な顕
著な諸効果を奏するものである。The funnel cylinder 26 is disengaged from the cylinder 28 at the upper end of the support frame 27 and slid downward.
It is also possible to easily replace the double-sealed furnace body 2 and remove it for cleaning.It utilizes the natural falling of rice husks, and also uses low-pressure blown air to heat the furnace at high temperature in an air chamber provided around the outside of the furnace body. It can burn rice husk efficiently by injecting it as high-pressure hot air while pressurizing it, and does not require large power for supplying rice husk to the combustion furnace, injecting high-pressure hot air, or removing ash. It has the remarkable effects mentioned above, such as being able to utilize rice husk as agricultural waste at a low cost while burning it at a high temperature to extract energy for heat exchange.
第1図は本発明の実施例に係る高熱送風モミガラ燃焼炉
装鷹の正面図、第2図はその二重密閉炉体2の要部を示
した縦断面図、第3図は上段のロストルを取外した平面
図、第4図は第2図A−A線断面図、第5図はロストル
の平面図、第6図はその正面図、第7図はその一部拡大
平面図、第8図はその一部拡大断面図、第9図はベンチ
ュリ−管9を示した炉体の一部拡大断面図、第10図は
ベンチュリー管の構成要素であるノズル軸8の正面図、
第11図はその底面図、第12図は同じく管体6の一部
を切欠した正面図、第13図はその平面図、第14図は
第1保温円筒の一部を切欠した正面図、第15図はその
平面図、第日6図は第2保温円筒の正面図、第17図は
その平面図、第18図は保熱体の正面図、第19図はそ
の平面図、第20図は支持枠27上端の円筒28の一部
を切欠した正面図、第21図はその平面図、第22図は
継手円筒30の一部を切欠した正面図、第23図はその
平面図、第24図は漏斗円筒の一部を切欠した正面図、
第25図はその平面図、第26図は第24図B−B線断
面図である。
第1図
第2図
第3図
第4図
第5図
第6図
第7図
第8図
第9図
第10図
第11図
第12図
第13図
第14図
第15図
第16図
第1了図
第18図
第19図
第幻図
第21図
第22図
第23図
第24図
第25図
第26図Fig. 1 is a front view of a high-temperature blast rice husk combustion furnace according to an embodiment of the present invention, Fig. 2 is a vertical sectional view showing the main parts of the double-sealed furnace body 2, and Fig. 3 is an upper roaster. 4 is a cross-sectional view taken along the line A-A in FIG. 2, FIG. The figure is a partially enlarged sectional view, FIG. 9 is a partially enlarged sectional view of the furnace body showing the venturi tube 9, and FIG. 10 is a front view of the nozzle shaft 8, which is a component of the venturi tube.
FIG. 11 is a bottom view thereof, FIG. 12 is a front view with a portion of the tube body 6 cut away, FIG. 13 is a plan view thereof, and FIG. 14 is a front view with a portion of the first heat insulating cylinder cut away. Fig. 15 is a plan view thereof, Fig. 6 is a front view of the second heat insulating cylinder, Fig. 17 is a plan view thereof, Fig. 18 is a front view of the heat insulating body, Fig. 19 is a plan view thereof, Fig. 20 The figure is a partially cutaway front view of the cylinder 28 at the upper end of the support frame 27, FIG. 21 is a plan view thereof, FIG. 22 is a partially cutaway front view of the joint cylinder 30, and FIG. 23 is a plan view thereof. Figure 24 is a partially cutaway front view of the funnel cylinder;
FIG. 25 is a plan view thereof, and FIG. 26 is a sectional view taken along the line B--B in FIG. 24. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Figure 1 Figure 18 Figure 19 Figure 21 Figure 22 Figure 23 Figure 24 Figure 25 Figure 26
Claims (1)
組の空気室を外周に設けた二重密閉炉体を形成し、該各
空気室の下部位置に空気取入口を連通し、各空気室の上
部位置において炉体の内外面に連通した孔を開孔し、内
部にノズル軸を嵌挿して該ノズル軸の回転により管体の
後端下面の風量調節穴を調整して先端よりの噴出量を調
整するベンチユリー管を各空気室の上部の穴に貫通して
各空気室と炉体内とを連通させ、外周面に多数の孔を開
孔した第1保温円筒を二重密閉炉体内に嵌挿し、第1保
温円筒の上端に第1ロストルを載着すると共に内部の中
央高さ位置と下端位置とに第2ロストルと第3ロストル
とを支架し、第2ロストルと第3ロストルとの間隔にお
いて第2保温円筒を挿入し、中央に孔を開孔した円板の
下面に脚を突設した保熱体を第2ロストルの上面に載設
して保熱体を第1ロストルの下面と対向させ、第1保温
円筒の側面上方位置に火炎口を開口して炉体の外面より
連通させた点火筒を火炎口と対向させ、点火筒の下方位
置において空気取入口を炉体の外面より内面へと連通さ
せると共に反対側において排煙口を同じく連通し、内部
に漏斗を設けた漏斗円筒を二重密閉炉体の上端に載着し
、適当高巾の支持枠内において下部中央位置に設置した
灰出装置の上面に二重密閉炉体を載設し、二重密閉炉体
の上部の漏斗円筒の上端を支持枠の上端中央位置に設け
た継手円筒に嵌合させ、支持枠に設置したコンプレスサ
ーより延長した高圧ホースを炉体の各空気室の空気取入
口に連通させたことを特徴として成る、高熱送風モミガ
ラ燃焼炉装置。1. A double sealed furnace body is formed by sealing the upper and lower ends and dividing it with vertical partitions and providing several sets of air chambers on the outer periphery. An air intake port is connected to the lower part of each air chamber, and each air chamber is separated by a vertical partition. A hole that communicates with the inner and outer surfaces of the furnace body is drilled at the upper part of the chamber, a nozzle shaft is inserted into the inside, and the air volume adjustment hole on the lower surface of the rear end of the tube is adjusted by rotating the nozzle shaft. A ventilator tube that adjusts the amount of ejection is passed through the hole at the top of each air chamber to communicate between each air chamber and the furnace body. The first rostol is mounted on the upper end of the first insulation cylinder, and the second rostol and the third rostol are supported at the center height position and the lower end position of the inside, and the second rostol and the third rostol are mounted on the upper end of the first insulation cylinder. A second heat insulating cylinder is inserted at intervals of The ignition tube is placed opposite to the bottom surface and has a flame port opened above the side surface of the first heat-retaining cylinder and communicated with from the outside surface of the furnace body. A funnel cylinder with a funnel inside is placed on the upper end of the double-sealed furnace body, communicating from the outer surface to the inner surface, and also communicating with the smoke exhaust port on the opposite side. A double-sealed furnace body is placed on top of the ash removal device installed at the same location, and the upper end of the funnel cylinder on the top of the double-sealed furnace body is fitted into the joint cylinder provided at the center of the upper end of the support frame to support the furnace. A high-heat blast rice husk combustion furnace device characterized by a high-pressure hose extending from a compressor installed in the frame and communicating with the air intake ports of each air chamber of the furnace body.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13137780A JPS603129B2 (en) | 1980-09-19 | 1980-09-19 | High heat blast rice husk combustion furnace equipment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13137780A JPS603129B2 (en) | 1980-09-19 | 1980-09-19 | High heat blast rice husk combustion furnace equipment |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5755314A JPS5755314A (en) | 1982-04-02 |
JPS603129B2 true JPS603129B2 (en) | 1985-01-25 |
Family
ID=15056513
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13137780A Expired JPS603129B2 (en) | 1980-09-19 | 1980-09-19 | High heat blast rice husk combustion furnace equipment |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS603129B2 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU2808484A (en) * | 1983-06-06 | 1984-12-13 | Macdermid, Inc. | Preparing printed circuit board thru-holes |
US4515829A (en) * | 1983-10-14 | 1985-05-07 | Shipley Company Inc. | Through-hole plating |
CN111219884B (en) * | 2018-11-26 | 2021-05-18 | 宁波方太厨具有限公司 | Anti-downdraft device of smoke exhaust pipe and gas water heater |
-
1980
- 1980-09-19 JP JP13137780A patent/JPS603129B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS5755314A (en) | 1982-04-02 |
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