JPH0639208Y2 - Water level control device - Google Patents
Water level control deviceInfo
- Publication number
- JPH0639208Y2 JPH0639208Y2 JP1988063470U JP6347088U JPH0639208Y2 JP H0639208 Y2 JPH0639208 Y2 JP H0639208Y2 JP 1988063470 U JP1988063470 U JP 1988063470U JP 6347088 U JP6347088 U JP 6347088U JP H0639208 Y2 JPH0639208 Y2 JP H0639208Y2
- Authority
- JP
- Japan
- Prior art keywords
- water level
- rod
- electrode
- level control
- water
- 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
Description
【考案の詳細な説明】 〔産業上の利用分野〕 この考案は、複数本の電極棒を用いて缶内の水位を制御
するためのボイラー等の水位制御装置の改良に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to improvement of a water level control device such as a boiler for controlling the water level in a can using a plurality of electrode rods.
従来、ボイラー等の水位制御装置として、それぞれ高さ
の異なる下端部（導電端）を有する複数本の電極棒によ
って、それらのどの下端部と缶水が接触しているか否か
を検出し、缶内水位を一定レベルに制御するものが用い
られている。Conventionally, as a water level control device for a boiler or the like, a plurality of electrode rods each having a lower end portion (conducting end) having different heights are used to detect which lower end portion of the water is in contact with the can water. The one that controls the inner water level to a certain level is used.
しかし、この方法では、電極棒の表面にスケールが付着
し、絶縁されて水位が検知できなくなったり、短絡によ
る動作不良を起こすことがあり、このような異常を起こ
したまま水位制御を継続すると、水位の異常上昇や異常
低下により、重大な事故を起こすおそれがある。However, in this method, the scale adheres to the surface of the electrode rod, and the water level cannot be detected due to insulation, or malfunction may occur due to a short circuit.If water level control is continued with such an abnormality, There is a risk of serious accidents due to abnormally high or low water levels.
この考案は、前記問題点に鑑みてなされたもので、電極
棒自体の異常を検出し、異常が検出された場合は、残り
の正常な電極棒のみによる水位制御に切り替えるように
したものである。The present invention has been made in view of the above problems, and detects an abnormality in the electrode rod itself, and when abnormality is detected, switches to water level control using only the remaining normal electrode rod. .
この考案は、前記課題を解決するためになされたもの
で、それぞれ高さの異なる電極端部を有する複数本の電
極棒により水位を制御するボイラー等の水位制御装置に
おいて、低位の電極棒が水位未検出信号を出力している
にも拘わらず、それより上位の電極棒が水位検出信号を
出力している場合に異常と判断する電極棒異常判定回路
を設け、該電極棒異常判定回路の出力信号により、前記
異常電極棒を除いた正常な電極棒のみよる水位制御に切
り替える水位制御回路を設けたことを特徴としている。This invention was made in order to solve the above-mentioned problems, and in a water level control device such as a boiler that controls the water level by a plurality of electrode rods having electrode ends of different heights, the lower electrode rod is An electrode rod abnormality determination circuit is provided to determine an abnormality when an electrode above the electrode outputs a water level detection signal despite outputting an undetected signal. It is characterized in that a water level control circuit is provided for switching to the water level control only by the normal electrode rod excluding the abnormal electrode rod by a signal.
以下、この考案の具体的実施例を図面に基づいて詳細に
説明する。Hereinafter, a specific embodiment of the present invention will be described in detail with reference to the drawings.
第１図は、この考案の第一実施例を示す概略説明図で、
ボイラー本体１は、その内部の詳細は第３図に示すよう
に、環状に形成した上部ヘッダー13と下部ヘッダー14を
多数の水管15で連結して構成されている。そして、ボイ
ラー本体１は、加熱用のバーナ２を備えるとともに、上
下のヘッダー13,14に連通して水管15内の水位を検出す
る水位検出器３を備えている。この水位検出器３は、内
部に長さの異なる複数本の電極棒（Ｌ棒,M棒,S棒）を有
する。FIG. 1 is a schematic explanatory view showing a first embodiment of the present invention,
The boiler main body 1 is constructed by connecting an upper header 13 and a lower header 14 formed in an annular shape with a large number of water pipes 15, as shown in FIG. The boiler body 1 includes a heating burner 2 and a water level detector 3 that communicates with the upper and lower headers 13 and 14 to detect the water level in the water pipe 15. The water level detector 3 has a plurality of electrode rods (L rod, M rod, S rod) having different lengths inside.
ボイラー本体１に接続した給水ライン５に設けた給水ポ
ンプ７のON−OFF制御を行う水位制御装置４は、水位検
出器３内の各電極棒L,M,Sからの検出信号を受け、この
検出信号に基づいて給水ポンプ７をON−OFF稼動させ、
ボイラーの缶内水位を一定レベルに保つように動作す
る。The water level control device 4 for performing ON-OFF control of the water supply pump 7 provided in the water supply line 5 connected to the boiler body 1 receives the detection signals from the electrode rods L, M, S in the water level detector 3, ON-OFF operation of the water supply pump 7 based on the detection signal,
It works to keep the water level in the boiler can at a certain level.
前記給水ライン５には、さらに逆止弁６が設けられてお
り、また前記バーナ２に接続した燃料供給ライン８に
は、燃料ポンプ９および燃料制御用電磁弁10が設けられ
ている。The water supply line 5 is further provided with a check valve 6, and the fuel supply line 8 connected to the burner 2 is provided with a fuel pump 9 and a fuel control solenoid valve 10.
そして、ボイラー本体１には、発生した蒸気の制御を行
う主蒸気弁11が設けられており、さらにボイラー本体１
に接続したブローライン（符号省略）には逆止弁12が設
けられている。The boiler main body 1 is provided with a main steam valve 11 for controlling the generated steam.
A check valve 12 is provided in the blow line (reference numeral omitted) connected to the.
さて、第１図の実施例は、水位検出器３内に３本の電極
棒L,M,Sを設けた実施例について図示したもので、具体
的な制御方式として、水位制御装置４は、各電極棒のう
ち、下端部が一番上位にあるＳ棒に水面が達すると給水
ポンプ７を停止させ、下端部が中位にあるＭ棒を水面が
切ると給水ポンプ７を稼動させて、缶内水位をＳ棒の下
端部とＭ棒の下端部との間にあるように制御する。ま
た、下端部が一番低位にあるＬ棒を水面が切ると、バー
ナ２の燃焼作動を停止して、低水位警報を出す構成とな
っている。The embodiment of FIG. 1 shows an embodiment in which three electrode rods L, M, S are provided in the water level detector 3, and as a concrete control method, the water level control device 4 is Of the electrode rods, the water supply pump 7 is stopped when the water surface reaches the uppermost S rod at the lower end, and the water supply pump 7 is operated when the water surface is cut off at the middle M rod at the lower end. The water level in the can is controlled so as to be between the lower end of the S rod and the lower end of the M rod. Further, when the water surface cuts off the L rod having the lowest lower end, the combustion operation of the burner 2 is stopped and a low water level alarm is issued.
このような構成において、３本の電極棒のうち、下端部
が低位の電極棒が水位未検出信号を出力しているにも拘
わらず、それより上位の電極棒が水位検出信号を出力し
ている場合は、いずれかの電極棒が、短絡あるいは伝導
不良を起こしている可能性があり、これを電極棒異常判
定回路41により検出し、その旨の信号を出力する。In such a configuration, among the three electrode rods, even though the electrode rod with the lower end at the lower position outputs the water level undetected signal, the electrode rods higher than that output the water level detected signal. If there is, it is possible that one of the electrode rods has a short circuit or a conduction failure, and this is detected by the electrode rod abnormality determination circuit 41, and a signal to that effect is output.
第２図は、第１図の実施例における各電極棒L,M,Sと水
位との関係を表したもので、Ｌ棒が常に正常に働いてい
るとして、水位を検知していないときの信号が「０」
で、水位を検知しているときの信号が「１」のときの真
理値を示している。FIG. 2 shows the relationship between each electrode rod L, M, S and the water level in the embodiment of FIG. 1, and shows that the L rod is always working normally and the water level is not detected. The signal is "0"
Shows the truth value when the signal when detecting the water level is "1".
これにより、異常が検出されたときは、水位制御回路42
により、異常電極棒を除いた正常な電極棒のみによる水
位制御に切り替える。Ｓ棒が異常と判断されたときは、
Ｍ棒とＬ棒とによる水位制御に切り替える。すなわち、
水面がＭ棒の下端部に達してt1秒後に給水ポンプ７を停
止し、水面がＭ棒の下端部を切ってt2秒後に給水ポンプ
７を稼動するように制御する。As a result, when an abnormality is detected, the water level control circuit 42
Thus, the water level control is switched to only the normal electrode rod excluding the abnormal electrode rod. When it is judged that the S rod is abnormal,
Switch to water level control using M rod and L rod. That is,
Control is performed so that the water supply pump 7 is stopped 1 t after the water surface reaches the lower end of the M rod, and the water supply pump 7 is activated t 2 seconds after the water surface cuts the lower end of the M rod.
また、Ｍ棒が異常と判断されたときは、Ｓ棒とＬ棒とに
よる水位制御に切り替え、上述の場合と同様な時間制御
による水位制御を行う。Further, when it is determined that the M rod is abnormal, the water level control is switched to the S rod and the L rod, and the water level control is performed by the time control similar to the above case.
なお、Ｓ棒とＭ棒がともに異常と判断されたときは、バ
ーナ２の燃焼作動を停止させ、警報を出すように構成さ
れている。When it is determined that both the S rod and the M rod are abnormal, the combustion operation of the burner 2 is stopped and an alarm is issued.
つぎに、この考案の第二実施例を第３図に基づいて説明
する。第３図において、第１図と同一の符号は、第１図
について説明した部材名と同一であり、その詳細な説明
は省略する。Next, a second embodiment of this invention will be described with reference to FIG. 3, the same reference numerals as those in FIG. 1 are the same as the member names described in FIG. 1, and the detailed description thereof will be omitted.
さて、第３図の実施例は、上部ヘッダー13内に設けた電
極棒Ｄと、前記３本の電極棒L,M,Sを有する水位検出器
３とを併用した実施例であり、これは、いわゆる二連水
位制御方式と呼ばれるもので、とくに冷態起動時や低負
荷時の水管15の過熱を防止する点において、優れた効果
を発揮する。Now, the embodiment shown in FIG. 3 is an embodiment in which the electrode rod D provided in the upper header 13 and the water level detector 3 having the three electrode rods L, M and S are used in combination. This is a so-called double water level control system, and exhibits an excellent effect particularly in preventing overheating of the water pipe 15 at the time of cold start and at the time of low load.
Ｄ棒の下端部は、Ｓ棒の下端部より上方位置にあり、具
体的な水位制御としては、水面がＤ棒かつＳ棒に達する
と給水ポンプ７を停止させ、水面がＤ棒またはＭ棒を切
ると給水ポンプ７を稼動させるように制御する。The lower end of the D rod is located above the lower end of the S rod. For concrete water level control, the water supply pump 7 is stopped when the water surface reaches the D rod and the S rod, and the water surface reaches the D rod or the M rod. When turned off, the water supply pump 7 is controlled to operate.
第４図および第５図は、第３図の実施例における各電極
棒L,M,S,Dと水位との関係を表したもので、Ｌ棒が常に
正常に働いているとして、水位を検知していないときの
信号が「０」で、水位を検知しているときの信号が
「１」のときの真理値を示している。ただし、加熱時に
おいて、水管15内が沸騰状態にある場合には、その発生
する気泡の量によって、水管15内の水面がもち上がり、
水位検出器３内の水面より上方位置となるため、電極棒
が正常であるにも拘わらず、水面がＤ棒には達するが、
Ｓ棒には未到達の状態が生じる。そこで、電極棒異常の
判定は、冷態時と加熱時とに分けて行うようにする（冷
態時：第４図，加熱時：第５図）。なお、冷態時と加熱
時の区別は、水管15に設けた温度センサー（図示省略）
等を用いて行う。FIGS. 4 and 5 show the relationship between each electrode rod L, M, S, D and the water level in the embodiment of FIG. 3, assuming that the L rod is always operating normally, The truth value when the signal when not detecting is "0" and the signal when detecting the water level is "1" is shown. However, at the time of heating, when the inside of the water pipe 15 is in a boiling state, the water level in the water pipe 15 rises depending on the amount of bubbles generated,
Since the position is higher than the water surface in the water level detector 3, the water surface reaches the D bar even though the electrode rod is normal.
An unreached state occurs in the S rod. Therefore, the determination of the electrode rod abnormality is made separately for the cold state and the heating state (cold state: FIG. 4, heating: FIG. 5). The temperature sensor (not shown) provided in the water pipe 15 is used to distinguish between the cold state and the heated state.
Etc.
Ｄ棒が異常と判断された場合は、Ｓ棒,M棒,L棒の３本の
電極棒による水位制御に切り替える。ただし、給水ポン
プ７の停止タイミングとして、Ｓ棒に水面が達しても、
ある程度（30秒程度）の遅延時間を持たせて停止させる
ようにし、水管15の過熱を防止する。また、Ｓ棒が異常
と判断された場合は、Ｄ棒,M棒,L棒の３本の電極棒によ
る水位制御に切り替える。つまり、給水ポンプ７の停止
条件としては、Ｄ棒が水位検出で，かつＭ棒が水位検出
（Ｍ棒の水位検出時には、15秒程度の遅延時間を設定）
であり、また給水ポンプ７の起動条件としては、Ｄ棒が
水位未検出またはＭ棒が水位未検出のようにする。When it is judged that the D rod is abnormal, the water level control is switched to the three electrode rods of S rod, M rod and L rod. However, even if the water surface reaches the S rod as the stop timing of the water supply pump 7,
The water pipe 15 is prevented from overheating by stopping it with a delay time of some degree (about 30 seconds). When it is determined that the S rod is abnormal, the water level control is switched to the three electrode rods of the D rod, the M rod, and the L rod. That is, as the stop condition of the water supply pump 7, the D rod detects the water level and the M rod detects the water level (when the water level of the M rod is detected, a delay time of about 15 seconds is set).
Further, as the starting condition of the water supply pump 7, the water level is not detected in the D bar or the water level is not detected in the M bar.
その他、Ｍ棒が異常と判断された場合は、Ｄ棒,S棒,L棒
の３本の電極棒による水位制御に切り替え、またＤ棒と
Ｓ棒が異常と判断された場合は、Ｍ棒とＬ棒の２本の電
極棒による水位制御に切り替える。In addition, if it is determined that M rod is abnormal, switch to water level control with three electrode rods, D rod, S rod, and L rod. If it is determined that D rod and S rod are abnormal, M rod is switched. And switch to the water level control by the two electrode rods of L rod.
なお、Ｓ棒とＤ棒が異常と判断された場合およびＤ棒,S
棒,M棒が異常と判断された場合は、バーナ２の燃焼作動
を停止させて警報を発するように構成する。If S rod and D rod are judged to be abnormal,
When it is determined that the rod and the rod M are abnormal, the combustion operation of the burner 2 is stopped and an alarm is issued.
前記のように、加熱時においては（第５図の場合）、水
管15内の沸騰水の気泡量の関係で、水面がＤ棒に達して
いるにも拘わらず、Ｓ棒,M棒あるいはＬ棒には未到達の
状態が生じるが、加熱時におけるこのような信号検出時
は、正常と判断する。As described above, at the time of heating (in the case of FIG. 5), due to the amount of bubbles of boiling water in the water pipe 15, the water surface reaches the D rod, but the S rod, the M rod, or the L rod. Although the rod may be in an unreachable state, it is determined to be normal when such a signal is detected during heating.
以上のように、この考案によれば、水位検出端，すなわ
ち電極棒が正常に作動しているか否かを常に確認し、電
極棒異常による事故を未然に防ぐことができる。よっ
て、従来のものに比べて、安全性が格段に向上する。ま
た、電極棒の異常が検出されても、残りの正常な電極棒
による水位制御により、ボイラーの運転を継続すること
ができ、蒸気の供給をストップすることがないので、実
用上の効果は大きく、この種の水位制御装置としては頗
る効果的である。As described above, according to the present invention, it is possible to always confirm whether the water level detecting end, that is, the electrode rod is operating normally, and prevent an accident due to an electrode rod abnormality. Therefore, the safety is significantly improved as compared with the conventional one. In addition, even if an abnormality of the electrode rod is detected, the water level control by the remaining normal electrode rod allows the boiler operation to be continued and the steam supply is not stopped. , Is very effective as a water level control device of this kind.
図面は、この考案の実施例を示すもので、第１図はこの
考案の第一実施例の概略説明図、第２図は第１図に示し
た実施例における各電極棒の異常の有無を判断する真理
値表、第３図はこの考案の第二実施例の概略説明図、第
４図および第５図は第３図に示した実施例における各電
極棒の異常の有無を判断する真理値表である。 １…ボイラー本体 ３…水位検出器 ４…水位制御装置 41…電極棒異常判定回路 42…水位制御回路The drawings show an embodiment of the present invention. FIG. 1 is a schematic explanatory view of the first embodiment of the present invention, and FIG. 2 shows whether or not there is an abnormality in each electrode rod in the embodiment shown in FIG. Truth table for judgment, FIG. 3 is a schematic explanatory view of the second embodiment of the present invention, and FIGS. 4 and 5 are truths for judging whether or not there is an abnormality in each electrode rod in the embodiment shown in FIG. It is a value table. 1 ... Boiler body 3 ... Water level detector 4 ... Water level control device 41 ... Electrode rod abnormality determination circuit 42 ... Water level control circuit
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭59−52716（ＪＰ，Ａ) 特開 昭60−111802（ＪＰ，Ａ) 特開 昭54−103905（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP 59-52716 (JP, A) JP 60-111802 (JP, A) JP 54-103905 (JP, A)
Claims (1)
数本の電極棒により水位を制御するボイラー等の水位制
御装置において、低位の電極棒が水位未検出信号を出力
しているにも拘わらず、それより上位の電極棒が水位検
出信号を出力している場合に異常と判断する電極棒異常
判定回路41を設け、該電極棒異常判定回路41の出力信号
により、前記異常電極棒を除いた正常な電極棒のみによ
る水位制御に切り替える水位制御回路42を設けたことを
特徴とする水位制御装置。1. A water level control device such as a boiler for controlling the water level by a plurality of electrode rods having electrode ends of different heights, even though the lower electrode rod outputs a water level undetected signal. No, the electrode rod abnormality determination circuit 41 for determining an abnormality when the electrode electrode higher than that is outputting the water level detection signal is provided, and the abnormal electrode rod is excluded by the output signal of the electrode rod abnormality determination circuit 41. A water level control device comprising a water level control circuit 42 for switching to water level control using only normal electrode rods.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988063470U JPH0639208Y2 (en) | 1988-05-13 | 1988-05-13 | Water level control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988063470U JPH0639208Y2 (en) | 1988-05-13 | 1988-05-13 | Water level control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01170805U JPH01170805U (en) | 1989-12-04 |
| JPH0639208Y2 true JPH0639208Y2 (en) | 1994-10-12 |
Family
ID=31288969
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988063470U Expired - Lifetime JPH0639208Y2 (en) | 1988-05-13 | 1988-05-13 | Water level control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0639208Y2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2526471B2 (en) * | 1992-11-09 | 1996-08-21 | 三浦工業株式会社 | Boiler water level control device |
| JP2549631Y2 (en) * | 1992-11-11 | 1997-09-30 | 三浦工業株式会社 | Boiler water level control device |
| JP6101928B2 (en) * | 2013-01-28 | 2017-03-29 | 株式会社サムソン | Water level detector |
| JP2020159244A (en) * | 2019-03-25 | 2020-10-01 | 株式会社荏原製作所 | Water supply device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54103905A (en) * | 1978-02-01 | 1979-08-15 | Miura Kogyo Kk | Method of and apparatus for controlling water level in boiler |
| JPS5952716A (en) * | 1982-09-20 | 1984-03-27 | Ebara Corp | Checking device for water level sensor of boiler system |
| JPS60111802A (en) * | 1983-11-18 | 1985-06-18 | 加藤 俊一 | Method and device for preventing superheating and corrosion of water tube for once-through type boiler |
-
1988
- 1988-05-13 JP JP1988063470U patent/JPH0639208Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01170805U (en) | 1989-12-04 |
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