JP4614758B2 - Drainage pump check valve abnormality detection system - Google Patents

Drainage pump check valve abnormality detection system Download PDF

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JP4614758B2
JP4614758B2 JP2004373818A JP2004373818A JP4614758B2 JP 4614758 B2 JP4614758 B2 JP 4614758B2 JP 2004373818 A JP2004373818 A JP 2004373818A JP 2004373818 A JP2004373818 A JP 2004373818A JP 4614758 B2 JP4614758 B2 JP 4614758B2
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drainage
check valve
pump
abnormality
flow rate
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JP2006177316A (en
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久雄 田中
哲也 田村
直人 増田
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Mitsubishi Electric Corp
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Description

この発明は、排水ポンプの逆止弁異常検出システム、特に、排水が流入する排水槽をポンプ毎に逆止弁を設けて単独および複数台ポンプの並列運転により排水する排水ポンプの逆止弁異常検出システムに関するものである。   The present invention relates to a check valve abnormality detection system for a drainage pump, and in particular, a check valve abnormality of a drainage pump that drains a drainage tank into which drainage flows by providing a check valve for each pump and draining it in parallel by operating a single unit or a plurality of pumps. It relates to a detection system.

従来技術における逆止弁故障異常検出システムとしては、水道本管より増圧して直接水道水を給水するようにし、逆止弁前後に圧力センサを設けて、給水側の弁が締切られ給水していない時に、逆止弁の下流側圧力が減少して上流側圧力に近づく場合を逆止弁異常と判定している（例えば、特許文献１参照）。   In the conventional check valve failure abnormality detection system, tap water is directly supplied by increasing pressure from the water main, and pressure sensors are provided before and after the check valve, and the water supply side valve is shut off to supply water. When there is not, the case where the downstream pressure of the check valve decreases and approaches the upstream pressure is determined as a check valve abnormality (see, for example, Patent Document 1).

特許第３３７８１０５号公報（第１−３頁、第１図）Japanese Patent No. 3378105 (page 1-3, FIG. 1)

従来技術による逆止弁異常検出システムは、以上のように構成されているので、逆止弁の前後に圧力センサを設けなければならず、複数のポンプがある場合は多数の圧力センサが必要となる。また、逆止弁異常検出は、ポンプが全台停止時の圧力差を検知するものであるため、１台でも運転しているポンプがあれば逆止弁異常検出はできないなどの問題点があった。   Since the check valve abnormality detection system according to the prior art is configured as described above, pressure sensors must be provided before and after the check valve, and when there are a plurality of pumps, a large number of pressure sensors are required. Become. In addition, check valve abnormality detection detects the pressure difference when all pumps are stopped, so there is a problem that check valve abnormality detection cannot be performed if there is a pump that is operating even with one unit. It was.

この発明は、上記のような課題を解決するためになされたものであり、簡潔な構成で的確に逆止弁の異常が検出できる排水ポンプの逆止弁異常検出システムを提供することを目的とする。   The present invention has been made to solve the above-described problems, and an object thereof is to provide a check valve abnormality detection system for a drainage pump that can accurately detect a check valve abnormality with a simple configuration. To do.

この発明に係る排水ポンプの逆止弁異常検出システムでは、逆止弁がそれぞれ設けられる複数台の排水ポンプで排水するものにおいて、前記排水ポンプの運転台数を制御するポンプ運転制御手段と、排水流量を検出するための排水流量検出手段とを備え、排水流量が前記排水ポンプの運転台数に対して設定されている基準値より小さい所定の流量状態を所定時間継続した場合に停止中の排水ポンプにおける逆止弁に異常が発生したと判断する逆止弁異常判定手段を設けたものである。   In the check valve abnormality detection system for a drainage pump according to the present invention, the drainage is performed by a plurality of drainage pumps each provided with a check valve, and pump operation control means for controlling the number of drainage pumps operated, In the drainage pump that is stopped when the drainage flow rate is lower than the reference value set for the number of operating drainage pumps for a predetermined time period. Check valve abnormality determining means for determining that an abnormality has occurred in the check valve is provided.

この発明によれば、簡潔な構成で的確に逆止弁の異常が検出できる排水ポンプの逆止弁異常検出システムを提供することができる。   According to the present invention, it is possible to provide a check valve abnormality detection system for a drainage pump that can accurately detect a check valve abnormality with a simple configuration.

実施の形態１．
この発明による実施の形態１を図１および図２に基づいて説明する。図１は実施の形態１における逆止弁異常検出システムの構成を示すブロック図である。図２は実施の形態１における逆止弁異常判定動作を示すフローチャートである。 Embodiment 1 FIG.
A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram showing a configuration of a check valve abnormality detection system in the first embodiment. FIG. 2 is a flowchart showing the check valve abnormality determination operation in the first embodiment.

図１において、流入水路１からの排水は排水槽２に流入し、排水槽２に溜まった排水は排水ポンプ３ａ，３ｂ，３ｃにより増圧されて排水される。排水ポンプ３ａ，３ｂ，３ｃは排水槽２内の水中に没入して配設されている。排水ポンプ３ａ，３ｂ，３ｃの吐出側には逆止弁４ａ，４ｂ，４ｃをそれぞれ設置し、ポンプ停止時における排水先や運転しているポンプからの逆流を防止している。
排水槽２に設置した水位計１０の水位信号は、ポンプ運転制御手段５に入力される。ポンプ運転制御手段５は、排水槽２の水位により排水ポンプ３ａ，３ｂ，３ｃの運転台数を制御する。また、ポンプ運転制御手段５には、排水ポンプ３ａ，３ｂ，３ｃの運転状態情報が入力される。逆止弁異常判定手段２０には、ポンプ運転制御手段５からのポンプ運転信号と逆止弁下流側の各ポンプの吐出側配管６ａ，６ｂ，６ｃを集合した管６に設置された排水流量計１１の流量信号が入力される。 In FIG. 1, the waste water from the inflow water channel 1 flows into the drainage tank 2, and the wastewater accumulated in the drainage tank 2 is increased in pressure by the drainage pumps 3a, 3b, 3c and drained. The drain pumps 3 a, 3 b, 3 c are arranged so as to be immersed in the water in the drain tank 2. Check valves 4a, 4b, and 4c are installed on the discharge side of the drainage pumps 3a, 3b, and 3c, respectively, to prevent backflow from the drainage destination and the pump being operated when the pump is stopped.
The water level signal of the water level gauge 10 installed in the drain tank 2 is input to the pump operation control means 5. The pump operation control means 5 controls the number of operating drain pumps 3 a, 3 b, 3 c according to the water level of the drain tank 2. Further, the operation status information of the drainage pumps 3a, 3b, 3c is input to the pump operation control means 5. The check valve abnormality determining means 20 includes a drainage flow meter installed in a pipe 6 in which the pump operation signal from the pump operation control means 5 and the discharge side pipes 6a, 6b, 6c of the pumps downstream of the check valve are assembled. 11 flow rate signals are input.

次に、動作について説明する。逆止弁異常判定手段２０では、ポンプ運転信号と排水流量計１１の信号を基に、図２に示すように、停止中の排水ポンプが１台以上ある場合に、ポンプ運転台数に対して設定した基準値と排水流量計１１の流量との差が設定値以下で、設定時間以上継続する場合に停止中ポンプの逆止弁が異常と判断して警報を出力する。停止中ポンプの逆止弁に異常があれば、運転している排水ポンプの吐出流量が停止中のポンプを通って排水槽内で循環し、排水流量が基準値より低下するので、これにより逆止弁異常判定を行うものである。   Next, the operation will be described. The check valve abnormality determination means 20 is set based on the pump operation signal and the signal from the drainage flow meter 11 when there is one or more stopped drainage pumps as shown in FIG. When the difference between the measured reference value and the flow rate of the drainage flow meter 11 is equal to or less than the set value and continues for the set time or longer, the check valve of the stopped pump is determined to be abnormal and an alarm is output. If there is an abnormality in the check valve of the pump that is stopped, the discharge flow rate of the drainage pump that is operating circulates in the drainage tank through the pump that is stopped, and the drainage flow rate falls below the reference value. The stop valve abnormality determination is performed.

図２において、まず、排水ポンプ３ａ，３ｂ，３ｃのうち停止台数が１台以上であるかどうかを判別する（ステップＳ１）。
排水ポンプ３ａ，３ｂ，３ｃのうち停止台数が１台以上であれば、排水流量計１１の流量測定値と運転台数に対する基準流量との流量差（＝流量測定値−運転台数に対する基準流量）を計算する（ステップＳ２）。
次に、排水流量計１１の流量測定値と運転台数に対する基準流量との流量差が設定値以下で設定時間以上継続しているかどうかを判別する（ステップＳ３）。
排水流量計１１の流量測定値と運転台数に対する基準流量との流量差が設定値以下で設定時間以上継続していれば、逆止弁異常と判断して警報を出力し（ステップＳ４）、終了する。
ステップＳ３で、排水流量計１１の流量測定値と運転台数に対する基準流量との流量差が設定値以下で設定時間以上継続していなければ、直ちに終了する。 In FIG. 2, first, it is determined whether or not the number of stopped pumps among the drain pumps 3a, 3b, 3c is one or more (step S1).
If the number of stops of the drainage pumps 3a, 3b, 3c is one or more, the flow rate difference between the measured flow rate of the drainage flow meter 11 and the reference flow rate with respect to the operating number (= flow rate measurement value−reference flow rate with respect to the operating number) is calculated. Calculate (step S2).
Next, it is determined whether or not the flow rate difference between the flow rate measurement value of the drainage flow meter 11 and the reference flow rate with respect to the number of operating units is equal to or less than the set value and continues for the set time (step S3).
If the flow rate difference between the measured flow rate of the drainage flow meter 11 and the reference flow rate for the number of operating units is less than the set value and continues for the set time or longer, it is determined that the check valve is abnormal and an alarm is output (step S4), and the process ends. To do.
If the flow rate difference between the measured flow rate of the drainage flow meter 11 and the reference flow rate with respect to the number of operating units is not more than the set value and has not continued for the set time in step S3, the process is immediately ended.

この発明による実施の形態１によれば、逆止弁４ａ，４ｂ，４ｃがそれぞれ設けられる複数台の排水ポンプ３ａ，３ｂ，３ｃで増圧して排水槽２の水を排水するものにおいて、前記排水ポンプ３ａ，３ｂ，３ｃの運転台数を制御しポンプ運転状態が検知できるポンプ運転制御手段５と、排水流量を検出するために排水吐出管６ａ，６ｂ，６ｃが集合する配管６に設置された排水流量計１１からなる排水流量検出手段とを備え、前記排水流量計１１からなる排水流量検出手段により検出された排水流量が前記排水ポンプ３ａ，３ｂ，３ｃの運転台数に対して設定されている基準値より小さい所定の流量状態を所定時間継続した場合に停止中の排水ポンプにおける逆止弁に異常が発生したと判断する逆止弁異常判定手段２０を設けたので、排水流量の所定継続状態により、簡潔な構成で的確に逆止弁の異常が検出できる排水ポンプの逆止弁異常検出システムを提供することができる。   According to Embodiment 1 of the present invention, the drainage water is drained by increasing the pressure by a plurality of drainage pumps 3a, 3b, 3c provided with check valves 4a, 4b, 4c, respectively. Pump operation control means 5 that can control the number of pumps 3a, 3b, and 3c to detect the pump operation state, and drainage that is installed in a pipe 6 in which drainage discharge pipes 6a, 6b, and 6c gather to detect the drainage flow rate. A drainage flow rate detection means comprising a flow meter 11, and a drainage flow rate detected by the drainage flow rate detection means comprising the drainage flow meter 11 is set for the number of operating drainage pumps 3a, 3b, 3c. Since the check valve abnormality determining means 20 is provided for determining that an abnormality has occurred in the check valve in the stopped drainage pump when a predetermined flow rate state smaller than the value is continued for a predetermined time, Given by continuous state, it is possible to provide a check valve abnormality detection system of drainage pump capable abnormality detection accurately check valve in a compact construction of the.

実施の形態２．
この発明による実施の形態２を図３について説明する。図３は実施の形態２における逆止弁異常検出システムの構成を示すブロック図である。
この実施の形態２において、ここで説明する特有の構成以外の構成については、先に説明した実施の形態１における構成と同一の構成内容を具備し同様の作用を奏するものである。図中、同一符号は同一または相当部分を示す。 Embodiment 2. FIG.
A second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a block diagram showing the configuration of the check valve abnormality detection system in the second embodiment.
In the second embodiment, the configuration other than the specific configuration described here has the same configuration contents as the configuration described in the first embodiment and has the same effect. In the drawings, the same reference numerals indicate the same or corresponding parts.

上記実施の形態１では、排水流量計１１と排水ポンプ運転信号により逆止弁異常を判断するシステムについて述べたが、この実施の形態２では、図３に示すように、排水槽２への流入水路１に流入流量計１２を設けて、次の式１で排水流量を推定して、この推定値とポンプ運転台数に対して設定した基準値と排水流量計１１の流量との差が設定値以下で、設定時間以上継続する場合に停止中ポンプの逆止弁が異常と判断するようにしており、上記実施の形態１と同様な効果を得ることができる。
排水流量推定値＝流入流量−排水槽断面積×排水槽水位変化………（式１） In the first embodiment, the system for determining the check valve abnormality by the drainage flow meter 11 and the drainage pump operation signal has been described. However, in the second embodiment, as shown in FIG. An inflow flow meter 12 is provided in the water channel 1 and the waste water flow rate is estimated by the following equation 1, and the difference between the estimated value and the reference value set for the number of pumps operated and the flow rate of the waste water flow meter 11 is a set value. In the following, if the check valve of the stopped pump is determined to be abnormal when it continues for a set time or longer, the same effect as in the first embodiment can be obtained.
Estimated drainage flow rate = Inflow flow rate-Drainage tank cross-sectional area x Drainage tank water level change ... (Equation 1)

すなわち、排水流量は、流入流量計１２により測定された流入流量から排水槽断面積と排水槽水位変化との積を減算することにより、推定でき、この排水流量推定値とポンプ運転台数に対して設定した基準値と排水流量計１１の流量との差が設定値以下で、設定時間以上継続する場合に停止中ポンプの逆止弁が異常と判断できるものである。   In other words, the drainage flow rate can be estimated by subtracting the product of the drainage tank cross-sectional area and the drainage tank water level change from the inflow rate measured by the inflow flowmeter 12, and with respect to the estimated drainage flow rate and the number of pumps operated. When the difference between the set reference value and the flow rate of the drainage flow meter 11 is equal to or less than the set value and continues for the set time or longer, the check valve of the stopped pump can be determined to be abnormal.

この発明による実施の形態２によれば、逆止弁４ａ，４ｂ，４ｃがそれぞれ設けられる複数台の排水ポンプ３ａ，３ｂ，３ｃで増圧して排水槽２の水を排水するものにおいて、前記排水槽２の水位を検出する水位計１０からなる水位検出手段と、前記排水槽２の水位に応じて排水ポンプ３ａ，３ｂ，３ｃの運転台数を制御しポンプ運転状態が検知できるポンプ運転制御手段５と、前記排水槽２に流入する流量を検出する流入流量計１２からなる流入量検出手段とを備え、前記流入流量計１２からなる流入量検出手段により検出された流入水量と前記水位計１０からなる水位検出手段により検出された前記排水槽２の水位変化から求めた排水流量推定値が前記排水ポンプ３ａ，３ｂ，３ｃの運転台数に対して設定されている基準値より小さい所定の流量状態を所定時間継続した場合に停止中の排水ポンプにおける逆止弁に異常が発生したと判断する逆止弁異常判定手段２０を設けたので、排水流量推定値の所定継続状態により、簡潔な構成で的確に逆止弁の異常が検出できる排水ポンプの逆止弁異常検出システムを提供することができる。   According to Embodiment 2 of the present invention, the drainage water is drained by increasing the pressure by a plurality of drainage pumps 3a, 3b, 3c provided with check valves 4a, 4b, 4c, respectively. A water level detection means comprising a water level meter 10 for detecting the water level of the water tank 2 and a pump operation control means 5 for controlling the number of drain pumps 3a, 3b, 3c according to the water level of the drain tank 2 and detecting the pump operation state. And an inflow amount detecting means comprising an inflow flow meter 12 for detecting the flow rate flowing into the drainage tank 2, and the inflow water amount detected by the inflow amount detecting means comprising the inflow flow meter 12 and the water level meter 10 The estimated drainage flow rate obtained from the change in the level of the drainage tank 2 detected by the water level detection means is smaller than the reference value set for the number of operating drainage pumps 3a, 3b, 3c. Since the check valve abnormality determining means 20 is provided for determining that an abnormality has occurred in the check valve in the drainage pump that is stopped when the flow rate state is continued for a predetermined time, the drainage flow rate estimated value is determined in a simple manner. It is possible to provide a check valve abnormality detection system for a drainage pump that can accurately detect a check valve abnormality with a simple configuration.

参考例
この発明による参考例を図４について説明する。図４は参考例における逆止弁異常検出システムの構成を示すブロック図である。
この参考例において、ここで説明する特有の構成以外の構成については、先に説明した実施の形態１および実施の形態２における構成と同一の構成内容を具備し同様の作用を奏するものである。図中、同一符号は同一または相当部分を示す。 Reference Example A reference example according to the present invention will be described with reference to FIG. FIG. 4 is a block diagram showing the configuration of the check valve abnormality detection system in the reference example .
In this reference example , the configuration other than the specific configuration described here has the same configuration as the configurations in the first and second embodiments described above, and exhibits the same operation. In the drawings, the same reference numerals indicate the same or corresponding parts.

上記実施の形態１では、逆止弁異常判定を行うためには排水流量計１１を設ける必要があったが、この参考例では、排水ポンプ３ａ，３ｂが２台で１台が予備機である場合は、図４に示すように、逆止弁異常判定手段２０において運転信号のみを使用して、１台運転継続時間が設定時間以上継続した場合、または、２台運転継続時間が設定時間以上継続した場合に逆止弁が異常と判断するようにする。
排水槽２ヘ流入する最大流量に対して、１台運転で排水可能なように排水ポンプの排水能力は選定されているので、１台運転の継続時間が長時間継続する場合や２台運転となる場合は、１台運転中のときに停止しているポンプの逆止弁に異常が発生して、運転しているポンプの吐出流量の一部が停止ポンプを通って排水槽２へ戻っているために排水槽２の水位が低下しない可能性が高いと判断できる。
この参考例においては、ポンプ運転信号のみ使用して、逆止弁異常判定を行うようにしたので、経済的な逆止弁異常判定手段が得られる。 In the first embodiment, it is necessary to provide the drainage flow meter 11 in order to perform the check valve abnormality determination. However, in this reference example , the drainage pumps 3a and 3b are two and one is a spare machine. In this case, as shown in FIG. 4, when only the operation signal is used in the check valve abnormality determination means 20, the one-unit operation continuation time continues for the set time or more, or the two-unit operation continuation time exceeds the set time If the check valve continues, check the check valve as abnormal.
Since the drainage capacity of the drainage pump is selected so that the maximum flow rate flowing into the drainage tank 2 can be drained by one unit operation, if the duration of one unit operation continues for a long time or two unit operation In such a case, an abnormality occurs in the check valve of the pump that is stopped when one unit is in operation, and part of the discharge flow rate of the pump that is operating returns to the drainage tank 2 through the stop pump. Therefore, it can be determined that there is a high possibility that the water level of the drainage tank 2 does not decrease.
In this reference example , since the check valve abnormality determination is performed using only the pump operation signal, an economical check valve abnormality determination means can be obtained.

この発明による参考例によれば、逆止弁がそれぞれ設けられる予備機１台を含む２台の排水ポンプ３ａ，３ｂで排水槽２の水を排水するものにおいて、排水ポンプ３ａ，３ｂの運転台数を制御しポンプ運転状態が検知できるポンプ運転制御手段５とポンプ１台運転継続時間が設定時間以上継続した場合、または、ポンプ２台運転継続時間が設定時間以上継続した場合に逆止弁が異常と判断する逆止弁異常判定手段２０を設けたので、排水ポンプ運転の所定継続状態により、簡潔な構成で的確に逆止弁の異常が検出できる排水ポンプの逆止弁異常検出システムを提供することができる。 According to the reference example of the present invention, in the case where the water in the drainage tank 2 is drained by two drain pumps 3a and 3b including one spare machine each provided with a check valve, the number of drain pumps 3a and 3b operated. The check valve is abnormal when the pump operation control means 5 that can detect the pump operation state and the pump operation duration time of one pump continues for the set time or when the pump operation time of two pumps continues for the set time or longer Since the check valve abnormality determining means 20 for determining the check valve abnormality is provided, a check valve abnormality detection system for a drain pump that can accurately detect a check valve abnormality with a simple configuration by a predetermined continuation state of the drain pump operation is provided. be able to.

実施の形態３．
この発明による実施の形態３を図５について説明する。図５は実施の形態３における逆止弁異常検出システムの構成を示すブロック図である。
この実施の形態３において、ここで説明する特有の構成以外の構成については、先に説明した実施の形態１および実施の形態２における構成と同一の構成内容を具備し同様の作用を奏するものである。図中、同一符号は同一または相当部分を示す。 Embodiment 3 FIG.
A third embodiment of the present invention will be described with reference to FIG. FIG. 5 is a block diagram showing the configuration of the check valve abnormality detection system in the third embodiment.
In the third embodiment, the configuration other than the specific configuration described here has the same configuration contents as the configurations in the first and second embodiments described above and exhibits the same operation. is there. In the drawings, the same reference numerals indicate the same or corresponding parts.

上記実施の形態１では、排水流量計１１と排水ポンプ運転信号により逆止弁異常を判断するものについて述べたが、この実施の形態３においては、図５に示すように、逆止弁の上流側に逆流を検知する逆流フロースイッチ１３ａ，１３ｂ，１３ｃをポンプ３ａ，３ｂ，３ｃ毎に設置し、逆止弁異常判定手段２０では、停止ポンプの逆流フロースイッチが作動した場合に逆流弁異常と判断するようにしたので、逆止弁異常が発生しているポンプを簡単かつ確実に特定することができる。 In Embodiment 1 described above, the check valve abnormality is determined based on the drainage flow meter 11 and the drainage pump operation signal. However, in Embodiment 3 , as shown in FIG. A reverse flow switch 13a, 13b, 13c for detecting a reverse flow is installed for each of the pumps 3a, 3b, 3c, and the check valve abnormality determining means 20 detects that the reverse flow valve is abnormal when the reverse flow switch of the stop pump is activated. Since the determination is made, it is possible to easily and reliably identify the pump in which the check valve abnormality has occurred.

この発明による実施の形態３によれば、逆止弁４ａ，４ｂ，４ｃがそれぞれ設けられる複数台の排水ポンプ３ａ，３ｂ，３ｃで増圧して排水槽２の水を排水するものにおいて、排水ポンプ３ａ，３ｂ，３ｃの運転台数を制御しポンプ運転状態が検知できるポンプ運転制御手段５と、逆止弁４ａ，４ｂ，４ｃのそれぞれの上流側に設けられ逆流を検知する逆流フロースイッチ１３ａ，１３ｂ，１３ｃからなる逆流検知手段とを備え、停止中ポンプの逆流検知手段が逆流を検知した場合、その逆止弁に異常が発生したと判断する逆止弁異常判定手段２０を設けたので、停止中ポンプの逆流検知により、簡潔な構成で的確に逆止弁の異常が検出できる排水ポンプの逆止弁異常検出システムを提供することができる。 According to the third embodiment of the present invention, the drainage pump is configured to discharge the water in the drainage tank 2 by increasing the pressure with a plurality of drainage pumps 3a, 3b, 3c provided with check valves 4a, 4b, 4c, respectively. Pump operation control means 5 that can control the number of operating units 3a, 3b, and 3c and detect the pump operation state, and reverse flow flow switches 13a and 13b that are provided upstream of the check valves 4a, 4b, and 4c and detect the reverse flow. , 13c, and a check valve abnormality determining means 20 for determining that an abnormality has occurred in the check valve when the reverse flow detecting means of the pump being stopped detects a reverse flow. By detecting the reverse flow of the middle pump, it is possible to provide a check valve abnormality detection system for a drainage pump that can accurately detect a check valve abnormality with a simple configuration.

実施の形態４．
この発明による実施の形態４を図６について説明する。図６は実施の形態４における逆止弁異常検出システムの構成を示すブロック図である。
この実施の形態４において、ここで説明する特有の構成以外の構成については、先に説明した実施の形態１から実施の形態３までにおける構成と同一の構成内容を具備し同様の作用を奏するものである。図中、同一符号は同一または相当部分を示す。 Embodiment 4 FIG.
A fourth embodiment of the present invention will be described with reference to FIG. FIG. 6 is a block diagram showing a configuration of a check valve abnormality detection system in the fourth embodiment.
In the fourth embodiment, the configuration other than the specific configuration described here has the same configuration contents as the configurations in the first to third embodiments described above and exhibits the same operation. It is. In the drawings, the same reference numerals indicate the same or corresponding parts.

上記実施の形態１では、逆止弁異常検知は可能であるが、逆止弁異常が発生しているポンプを特定することはできないものであるところ、この実施の形態４では、図６に示すように、異常逆止弁特定手段２１を設けるとともに、ポンプ運転制御手段５で、最初に運転される１台目の排水ポンプ号機は、順番にローテーションを行い、一定期間中（ローテーション期間）に設置されている排水ポンプは必ず運転されるようにローテーション運転を実行する。
異常逆止弁特定手段２１では、ポンプ１台運転時における各号機の運転状態と逆止弁異常検知の履歴をローテーション期間分保存しておき、保存された排水ポンプ１台運転期間において、異常判定対象の排水ポンプ号機（例えば、ａ号機：３ａ）が停止している場合は全て異常検知が発生し、かつ着目する排水ポンプ号機（ａ号機：３ａ）が運転している場合は全て異常検知が発生していないならば、異常判定対象の排水ポンプ号機（ａ号機：３ａ）の逆止弁４ａに異常が発生していると判断する。
異常判定対象の排水ポンプ号機は、設置されている排水ポンプ号機３ａ，３ｂ，３ｃすべてについて行い、異常逆止弁特定手段２１による異常逆止弁特定判断はローテーション期間の周期で行うものとする。
異常逆止弁特定手段２１により、逆流フロースイッチをポンプ毎に設置することなく安価に異常発生した逆止弁を特定することができる。 In the first embodiment, it is a check valve abnormality detection can, where it shall not be able to identify a pump check valve abnormality has occurred, in the fourth embodiment, shown in FIG. 6 As described above, the abnormal check valve specifying means 21 is provided, and the first drainage pump unit operated first by the pump operation control means 5 is rotated in order and installed during a certain period (rotation period). Rotation operation is carried out so that the drainage pump that is being operated is always operated.
The abnormal check valve specifying means 21 stores the operating state of each unit during the operation of one pump and the history of check valve abnormality detection for the rotation period, and determines the abnormality in the stored operation period of one drain pump. When the target drainage pump unit (for example, Unit a: 3a) is stopped, all abnormalities are detected, and when the target drainage pump unit (No. a: 3a) is operating, all abnormalities are detected. If it does not occur, it is determined that an abnormality has occurred in the check valve 4a of the drainage pump machine (No. a: 3a) subject to abnormality determination.
The drainage pump units that are subject to abnormality determination are performed for all the drainage pump units 3a, 3b, and 3c that are installed, and the abnormal check valve specifying determination by the abnormal check valve specifying means 21 is performed in the period of the rotation period.
The abnormal check valve specifying means 21 can specify a check valve in which an abnormality has occurred at low cost without installing a reverse flow switch for each pump.

この発明による実施の形態４によれば、逆止弁４ａ，４ｂ，４ｃがそれぞれ設けられる複数台の排水ポンプ３ａ，３ｂ，３ｃで増圧して排水槽２の水を排水するものにおいて、排水ポンプの運転台数を制御しポンプ運転状態が検知できるポンプ運転制御手段５を備え、最初に運転される１台目の排水ポンプ号機は、順番にローテーションを行い、一定期間中に設置されている排水ポンプは必ず運転する機能を前記ポンプ運転制御手段５に付与するとともに、ポンプ１台運転時における各号機の運転状態と逆止弁異常検知の履歴を設定期間分保存し、保存された排水ポンプ１台運転期間において、異常判定対象の排水ポンプ号機が停止している場合は全て異常検知が発生し、かつ異常判定対象の排水ポンプ号機が運転している場合は全て異常検知が発生していないならば、異常判定対象の排水ポンプ号機の逆止弁に異常が発生していると判断する異常逆止弁特定手段２１を設けたので、排水ポンプの運転状態と逆止弁異常検知の履歴とにより異常逆止弁を特定して、簡潔な構成で的確に逆止弁の異常が検出できる排水ポンプの逆止弁異常検出システムを提供することができる。 According to the fourth embodiment of the present invention, the drainage pump is configured to discharge the water in the drainage tank 2 by increasing the pressure by a plurality of drainage pumps 3a, 3b, 3c provided with check valves 4a, 4b, 4c, respectively. The pump operation control means 5 that can control the operation number of the pumps and detect the pump operation state, the first drainage pump unit to be operated first is rotated in order, and the drainage pump installed during a certain period Always gives the operation function to the pump operation control means 5 and stores the operation state of each unit and the history of check valve abnormality detection during the operation of one pump for a set period, and one stored drainage pump During the operation period, when the drainage pump unit subject to abnormality judgment is stopped, all abnormality detection occurs, and when the drainage pump unit subject to abnormality judgment is operating, all fault detection is performed. If the check valve of the drainage pump unit that is subject to abnormality determination is abnormal, the abnormal check valve specifying means 21 is provided to determine that an abnormality has occurred. It is possible to provide a check valve abnormality detection system for a drainage pump that can specify an abnormal check valve based on a history of abnormality detection and accurately detect a check valve abnormality with a simple configuration.

この発明による実施の形態１における逆止弁異常検出システムの構成を示すブロック図である。It is a block diagram which shows the structure of the non-return valve abnormality detection system in Embodiment 1 by this invention. この発明による実施の形態１における逆止弁異常判定動作を示すフローチャートである。It is a flowchart which shows the non-return valve abnormality determination operation | movement in Embodiment 1 by this invention. この発明による実施の形態２における逆止弁異常検出システムの構成を示すブロック図である。It is a block diagram which shows the structure of the non-return valve abnormality detection system in Embodiment 2 by this invention. この発明による参考例における逆止弁異常検出システムの構成を示すブロック図である。It is a block diagram which shows the structure of the non-return valve abnormality detection system in the reference example by this invention. この発明による実施の形態３における逆止弁異常検出システムの構成を示すブロック図である。It is a block diagram which shows the structure of the non-return valve abnormality detection system in Embodiment 3 by this invention. この発明による実施の形態４における逆止弁異常検出システムの構成を示すブロック図である。It is a block diagram which shows the structure of the non-return valve abnormality detection system in Embodiment 4 by this invention.

１ 流入水路、２ 排水槽、３ａ，３ｂ，３ｃ 排水ポンプ、４ａ，４ｂ，４ｃ 逆止弁、５ ポンプ運転制御手段、１０ 水位計、１１ 排水流量計、１３ａ，１３ｂ，１３ｃ 逆流フロースイッチ、２０ 逆止弁異常判定手段、２１ 異常逆止弁特定手段。   DESCRIPTION OF SYMBOLS 1 Inflow water channel, 2 Drain tank, 3a, 3b, 3c Drain pump, 4a, 4b, 4c Check valve, 5 Pump operation control means, 10 Water level meter, 11 Drain flow meter, 13a, 13b, 13c Backflow flow switch, 20 Check valve abnormality determining means, 21 Abnormal check valve specifying means.

Claims (4)

逆止弁がそれぞれ設けられる複数台の排水ポンプで排水するものにおいて、前記排水ポンプの運転台数を制御するポンプ運転制御手段と、排水流量を検出するための排水流量検出手段とを備え、前記排水流量検出手段により検出された排水流量が前記排水ポンプの運転台数に対して設定されている基準値より小さい所定の流量状態を所定時間継続した場合に停止中の排水ポンプにおける逆止弁に異常が発生したと判断する逆止弁異常判定手段を設けたことを特徴とする排水ポンプの逆止弁異常検出システム。   In the case of draining with a plurality of drainage pumps each provided with a check valve, the drainage pump comprises a pump operation control means for controlling the number of drainage pumps operated and a drainage flow rate detection means for detecting the drainage flow rate, If the drainage flow rate detected by the flow rate detection means continues for a predetermined time at a predetermined flow rate state that is smaller than the reference value set for the number of drainage pumps operated, there is an abnormality in the check valve in the drainage pump that is stopped. A check valve abnormality detection system for a drainage pump, characterized by comprising a check valve abnormality determination means for determining that a discharge has occurred. 逆止弁がそれぞれ設けられる複数台の排水ポンプで排水槽の水を排水するものにおいて、前記排水槽の水位を検出する水位検出手段と、前記排水槽の水位に応じて排水ポンプの運転台数を制御するポンプ運転制御手段と、前記排水槽に流入する流量を検出する流入量検出手段とを備え、前記流入量検出手段により検出された流入水量と前記水位検出手段により検出された前記排水槽の水位変化から求めた排水流量推定値が前記排水ポンプの運転台数に対して設定されている基準値より小さい所定の流量状態を所定時間継続した場合に停止中の排水ポンプにおける逆止弁に異常が発生したと判断する逆止弁異常判定手段を設けたことを特徴とする排水ポンプの逆止弁異常検出システム。   In the case of draining the water of the drainage tank with a plurality of drainage pumps each provided with a check valve, the water level detection means for detecting the water level of the drainage tank, and the number of drainage pumps operated according to the water level of the drainage tank A pump operation control means for controlling, and an inflow amount detecting means for detecting a flow rate flowing into the drainage tank, and the inflow water amount detected by the inflow amount detection means and the drainage tank detected by the water level detection means. If the estimated drainage flow rate obtained from the change in water level is lower than the reference value set for the number of drainage pumps in operation for a predetermined time, the check valve in the stopped drainage pump is abnormal. A check valve abnormality detection system for a drainage pump, characterized by comprising a check valve abnormality determination means for determining that a discharge has occurred. 逆止弁がそれぞれ設けられる複数台の排水ポンプで排水するものにおいて、排水ポンプの運転台数を制御するポンプ運転制御手段と、前記逆止弁のそれぞれに設けられ逆流を検知する逆流検知手段とを備え、停止中ポンプの逆流検知手段が逆流を検知した場合、その逆止弁に異常が発生したと判断する逆止弁異常判定手段を設けたことを特徴とする排水ポンプの逆止弁異常検出システム。   In the case of draining with a plurality of drain pumps each provided with a check valve, a pump operation control means for controlling the number of drain pumps operated, and a back flow detection means for detecting a back flow provided in each of the check valves. The check valve abnormality detection of the drainage pump is provided with a check valve abnormality determination means for judging that an abnormality has occurred in the check valve when the reverse flow detection means of the pump being stopped detects a reverse flow system. 逆止弁がそれぞれ設けられる複数台の排水ポンプで排水するものにおいて、排水ポンプの運転台数を制御するポンプ運転制御手段を備え、予め設定されたローテーション期間において前記排水ポンプのローテーション運転を行う運転制御機能を前記ポンプ運転制御手段に付与するとともに、ポンプ１台運転時における各号機の運転状態と逆止弁異常検知の履歴を設定期間分保存し、保存された排水ポンプ１台運転期間において、異常判定対象の排水ポンプ号機が停止している場合は全て異常検知が発生し、かつ異常判定対象の排水ポンプが運転している場合は全て異常検知が発生していないならば、異常判定対象の排水ポンプの逆止弁に異常が発生していると判断する異常逆止弁特定手段を設けたことを特徴とする排水ポンプの逆止弁異常検出システム。   In the case of draining with a plurality of drain pumps each provided with a check valve, it is provided with pump operation control means for controlling the number of drain pumps operated, and operation control for rotating the drain pumps during a preset rotation period. A function is added to the pump operation control means, and the operation state of each unit and the check valve abnormality detection history during the operation of one pump are stored for a set period, and an abnormality is detected during the operation period of one stored drainage pump. If the drainage pump unit subject to judgment is stopped, all abnormalities will be detected, and if the drainage pump subject to abnormality judgment is not operating, all abnormalities will be detected. Checking the abnormality of the check valve of the drainage pump, characterized by providing an abnormal check valve specifying means for judging that an abnormality has occurred in the check valve of the pump System.
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