JP4582396B2 - Water pump control system - Google Patents

Water pump control system Download PDF

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JP4582396B2
JP4582396B2 JP2004207991A JP2004207991A JP4582396B2 JP 4582396 B2 JP4582396 B2 JP 4582396B2 JP 2004207991 A JP2004207991 A JP 2004207991A JP 2004207991 A JP2004207991 A JP 2004207991A JP 4582396 B2 JP4582396 B2 JP 4582396B2
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water
water supply
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学 古月
賢一 井上
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Yokogawa Electric Corp
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Description

本発明は、熱交換器に送水する送水ポンプの運転を制御する送水ポンプ制御システムに関する。   The present invention relates to a water supply pump control system that controls the operation of a water supply pump that supplies water to a heat exchanger.

図８は特許文献１に開示されている従来の送水ポンプ制御システムの一例を示す機能ブロック図である。一次送水ポンプ１は、戻りヘッダ２からの冷水あるいは温水を冷凍機又はヒータ３を介して第１の送りヘッダ４に送る。   FIG. 8 is a functional block diagram showing an example of a conventional water pump control system disclosed in Patent Document 1. As shown in FIG. The primary water pump 1 sends the cold water or hot water from the return header 2 to the first feed header 4 via the refrigerator or the heater 3.

二次送水ポンプ５は、インバータ６を備え第１の送りヘッダ４から第２の送りヘッダ７に冷水あるいは温水を送る。流量センサ８は、第２の送りヘッダ７から制御二方弁９と熱交換器１１を介して戻りヘッダ２に送られる冷水あるいは温水の流量を測定する。   The secondary water pump 5 includes an inverter 6 and sends cold water or hot water from the first feed header 4 to the second feed header 7. The flow sensor 8 measures the flow rate of cold water or hot water sent from the second feed header 7 to the return header 2 via the control two-way valve 9 and the heat exchanger 11.

差圧センサ１２は、第２の送りヘッダ７と戻りヘッダ２との冷水あるいは温水の差圧を測定する。台数制御コントローラ２１は、流量センサ８と差圧センサ１２との測定値から二次送水ポンプ５に最適運転台数となるように運転台数を指令する。   The differential pressure sensor 12 measures the differential pressure of cold water or hot water between the second feed header 7 and the return header 2. The number-of-units controller 21 commands the number of operating units so that the number of operating units becomes the optimal number of operating units for the secondary water pump 5 from the measured values of the flow rate sensor 8 and the differential pressure sensor 12.

以上の構成において、一次送水ポンプ１により製造された冷水あるいは温水は、二次送水ポンプ５により、二次側ユースポイントの熱交換器１１へ送水される。熱交換器１１の必要熱交換量に応じ、制御二方弁９が制御されることにより、二次側循環水量は変流量となる。   In the above configuration, cold water or hot water produced by the primary water pump 1 is fed by the secondary water pump 5 to the heat exchanger 11 at the secondary use point. By controlling the control two-way valve 9 according to the required heat exchange amount of the heat exchanger 11, the secondary-side circulating water amount becomes a variable flow rate.

この時、流量センサ８により循環水流量を検出し、最適運転台数となる様に、台数制御コントローラ２１より、二次送水ポンプ５へ運転指令を出す。同時に、差圧センサ１２により第２の送りヘッダ７と戻りヘッダ２との差圧を検出し、予め設定された必要差圧となるように、インバータ６に対し、回転数制御信号を発信する。   At this time, the circulating water flow rate is detected by the flow rate sensor 8, and an operation command is issued from the unit controller 21 to the secondary water pump 5 so that the optimum number of units can be operated. At the same time, the differential pressure sensor 12 detects the differential pressure between the second feed header 7 and the return header 2, and sends a rotation speed control signal to the inverter 6 so that the required differential pressure is set in advance.

この圧力制御の特徴は、流量センサ８の測定信号を基に、外部入力信号あるいはデータ蓄積部のテーブルに基づいてシステム全体の固定抵抗Ｋ０と管路定数Ｋ１及びＫ２と摩擦損失水頭計算式による定数ｎの数値とを選択して送水圧力設定値を演算し、この設定値と差圧センサ１２で計測された差圧測定値との偏差をＰＩＤ演算して前記インバータの回転数を操作している。   This pressure control is characterized by the fixed resistance K0, the line constants K1 and K2, and the constant based on the friction loss head calculation formula based on the external input signal or the table of the data storage unit based on the measurement signal of the flow sensor 8. The numerical value of n is selected to calculate the water supply pressure set value, and the difference between this set value and the differential pressure measured value measured by the differential pressure sensor 12 is PID calculated to manipulate the rotation speed of the inverter. .

図９は、流量Ｑに対して演算される送水圧力Ｐ１の特性曲線図である。入出力演算部２２１で実行される演算は、次式による。
Ｐ１＝Ｋ０＋Ｋ１・Ｑ＋Ｋ２・Ｑｎ
ここで、Ｐ１は二次ポンプの送水圧力、Ｋ０はシステム全体の固定抵抗、Ｋ１は管路定数、Ｋ２は管路定数、Ｑは二次ポンプの送水流量、ｎは摩擦損失水頭計算式による定数（通常２）である。 FIG. 9 is a characteristic curve diagram of the water supply pressure P1 calculated with respect to the flow rate Q. The calculation executed by the input / output calculation unit 221 is according to the following equation.
P1 = K0 + K1 · Q + K2 · Q n
Here, P1 is the secondary pump water supply pressure, K0 is the fixed resistance of the entire system, K1 is the pipe constant, K2 is the pipe constant, Q is the secondary pump water supply flow rate, and n is the constant based on the friction loss head calculation formula. (Normally 2).

加圧送水ポンプシステムにおいては、具体的には例えば、空調システムにおいては、冬季は早朝、夏期には午後に負荷のピークが発生する。また、生産機器がある場合には、稼動状態により、負荷変動による冷温水冷却水の流量変化が発生する。   In a pressurized water pump system, specifically, for example, in an air conditioning system, a load peak occurs in the early morning in winter and in the afternoon in summer. In addition, when there is a production device, a change in the flow rate of cold / warm water due to load fluctuation occurs depending on the operating state.

従って、パラメータ（Ｋ０，Ｋ１，Ｋ２，ｎ）は負荷変動、負荷パターンにより、その都度最適値がある。これらパラメータを、外部信号入力３１である、例えば、外気温度入力信号、生産機器電力使用量入力信号、又はデータ蓄積部２２５に蓄積された種々のテーブル、例えば、季節変動テーブル、稼働率変動テーブル、負荷変動テーブル等を選択して取得する。   Accordingly, the parameters (K0, K1, K2, n) have optimum values each time depending on the load fluctuation and load pattern. These parameters are external signal input 31, for example, outside temperature input signal, production equipment power consumption input signal, or various tables stored in the data storage unit 225, such as a seasonal variation table, an operation rate variation table, Select and obtain a load fluctuation table.

このような手法により、外部の環境要因等を考慮して送水流量Ｑに見合った最適な圧力を算出し、この圧力を目標としてポンプの回転数を操作することで予測した管路抵抗特性で圧力変動運転する場合、この管路抵抗特性は、実際の管路抵抗特性の変動幅よりマージンを取って設定する。   By such a method, the optimum pressure corresponding to the water supply flow rate Q is calculated in consideration of external environmental factors, etc., and the pressure with the pipe resistance characteristic predicted by operating the rotation speed of the pump with this pressure as a target. In the case of fluctuating operation, the pipe resistance characteristic is set with a margin from the fluctuation range of the actual pipe resistance characteristic.

図１０は、特性変動幅に対して動作マージンを考慮して設定した管路抵抗特性曲線図であり、変動幅よりやや高めの圧力設定値を演算している。   FIG. 10 is a pipe resistance characteristic curve diagram set in consideration of the operation margin with respect to the characteristic fluctuation range, and calculates a pressure setting value slightly higher than the fluctuation range.

熱交換器に送水する送水ポンプの運転を制御する送水ポンプ制御システムに関連する先行技術文献としては次のようなものがある。   Prior art documents relating to a water pump control system for controlling the operation of a water pump for feeding water to a heat exchanger include the following.

特開２００３−１０６７３１号公報JP 2003-106731 A

従来システムの圧力設定手法では、次のような問題点がある。
（１）管路抵抗特性の変動幅が予想より大きく、図１０の動作マージンを取った特性より上側になってしまった場合には、送水圧力が不足してしまう。このとき、熱交換器に十分な水量の冷温水が送れず、必要な熱交換機能が得られない。 The conventional system pressure setting method has the following problems.
(1) If the fluctuation range of the pipe resistance characteristic is larger than expected and becomes higher than the characteristic with the operation margin shown in FIG. 10, the water supply pressure becomes insufficient. At this time, a sufficient amount of cold / hot water cannot be sent to the heat exchanger, and a necessary heat exchange function cannot be obtained.

（２）ポンプの運転台数が増加又は減少して場合、流量に見合った圧力を出すエネルギー源がデジタル的に増加又は減少してしまうため、送水ポンプに対して新たに回転数指示をしなおす必要が発生する。このため正しい圧力に到達するまで時間がかかり、最適な制御特性が得られない。 (2) When the number of operating pumps increases or decreases, the energy source that produces the pressure corresponding to the flow rate increases or decreases digitally. Therefore, it is necessary to newly indicate the rotation speed to the water pump. Will occur. For this reason, it takes time to reach the correct pressure, and optimal control characteristics cannot be obtained.

（３）管路抵抗特性のセットを切り替える場合、他の制御パラメータ（ＰＩＤ、ＳＶ上下限値等）がそのままだと、最適な制御特性が得られない。 (3) When switching the set of pipe resistance characteristics, if other control parameters (PID, SV upper and lower limit values, etc.) remain as they are, optimal control characteristics cannot be obtained.

従って本発明が解決しようとする課題は、管路抵抗特性の変動やポンプの運転台数変動に対して最適な圧力制御特性を与えることができる送水ポンプ制御システムを実現することにある。   Therefore, the problem to be solved by the present invention is to realize a water pump control system capable of providing optimum pressure control characteristics with respect to fluctuations in pipe resistance characteristics and fluctuations in the number of operating pumps.

このような課題を達成するために、本発明の構成は次の通りである。
（１）熱交換器に送水する送水ポンプの送水圧力を、送水流量に応じて決まる管路抵抗特性の大きさに応じて圧力調節手段により制御する送水ポンプ制御システムにおいて、
前記熱交換器に送る水の温度と熱交換器から戻ってきた水の温度差となる往還温度差または前記送水ポンプの運転台数情報に基づいて前記圧力調節手段に設定する送水圧力設定値に付加するオフセットを調整する設定値調整手段を設けたことを特徴とする送水ポンプ制御システム。
In order to achieve such an object, the configuration of the present invention is as follows.
(1) In a water supply pump control system that controls the water supply pressure of a water supply pump that supplies water to a heat exchanger by pressure adjusting means according to the magnitude of the pipe resistance characteristic determined according to the water supply flow rate.
Added to the water supply pressure set value set in the pressure adjusting means based on the difference between the temperature of the water sent to the heat exchanger and the return temperature difference which is the temperature difference of the water returned from the heat exchanger or the number of operating pumps. A water supply pump control system comprising a set value adjusting means for adjusting the offset to be performed.

（２）前記設定値調整手段は、前記往還温度差と往還温度差の上限値及び下限値に基づいて前記送水圧力設定値に付加するオフセットを算出することを特徴とする（１）に記載の送水ポンプ制御システム。 (2) The set value adjusting means calculates an offset to be added to the water supply pressure set value based on an upper limit value and a lower limit value of the return temperature difference and the return temperature difference. Water pump control system.

（３）前記設定値調整手段は、前記往還温度差と往還温度差の設計値に基づいて前記送水圧力設定値に付加するオフセットを算出することを特徴とする（１）に記載の送水ポンプ制御システム。 (3) The water supply pump control according to (1), wherein the set value adjusting means calculates an offset to be added to the water supply pressure set value based on a design value of the return temperature difference and the return temperature difference. system.

（４）前記設定値調整手段は、前記送水ポンプの運転台数変動に基づいて前記送水圧力設定値に付加するオフセットを算出することを特徴とする（１）に記載の送水ポンプ制御システム。
( 4 ) The water supply pump control system according to ( 1 ), wherein the set value adjusting means calculates an offset to be added to the water supply pressure set value based on a change in the number of operating water pumps.

（５）前記設定値調整手段は、前記送水ポンプの運転台数の変動比率値及び感度係数値に基づいて前記送水圧力設定値に付加するオフセットを算出することを特徴とする（１）に記載の送水ポンプ制御システム。
 (5) the setting value adjustment means described in (1) to calculate an offset to be added to the water supply pressure setpoint based on the variable ratio values and the sensitivity coefficient value of the number of operating units of the water pump Water pump control system.

（６）前記設定値調整手段は、前記送水ポンプの運転台数の変動後、指定の時間にわたって前記オフセットを出力するオフセットタイマーを備えたことを特徴とする（４）又は（５）に記載の送水ポンプ制御システム。
( 6 ) The water supply unit according to ( 4 ) or ( 5 ), wherein the set value adjusting means includes an offset timer that outputs the offset over a specified time after a change in the number of operating water pumps. Pump control system.

以上説明したことから明らかなように、本発明によれば次のような効果がある。
（１）熱交換器に送る水の温度と熱交換器から戻ってきた水の温度差となる往還温度差に基づいて送水圧力設定値のオフセット又は関数演算の係数を調整することにより、管路抵抗特性の変動やポンプの運転台数変動等の外乱に対して圧力制御特性を向上せしめることが可能となる。 As is apparent from the above description, the present invention has the following effects.
(1) By adjusting the offset of the water supply pressure set value or the coefficient of function calculation based on the difference between the temperature of the water sent to the heat exchanger and the return temperature difference that is the temperature difference of the water returned from the heat exchanger, It is possible to improve the pressure control characteristics against disturbances such as fluctuations in resistance characteristics and fluctuations in the number of operating pumps.

（２）送水ポンプの運転台数の変動又は変動比率値に基づいて送水圧力設定値に付加するオフセットを算出することにより、管路抵抗特性の変動やポンプの運転台数変動等の外乱に対して圧力制御特性を向上せしめることが可能となる。 (2) By calculating the offset added to the water supply pressure set value based on the fluctuation or fluctuation ratio value of the number of water pumps operating, pressure against disturbances such as fluctuations in pipe resistance characteristics and fluctuations in the number of pumps operated Control characteristics can be improved.

以下、本発明を図面により詳細に説明する。図１は本発明を適用した送水ポンプ制御システムの一実施形態を示す機能ブロック図である。図８で説明した従来システムと同一要素には同一符号を付し、説明を省略する。以下、本発明の特徴部につき説明する。   Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a functional block diagram showing an embodiment of a water pump control system to which the present invention is applied. The same elements as those in the conventional system described with reference to FIG. Hereinafter, the characteristic part of the present invention will be described.

図１において、１３は圧力調節手段であり、圧力センサ１２の測定値Ｐを入力し圧力設定値との偏差をＰＩＤ演算した出力で二次送水ポンプ５のインバータ６を操作する。１４は設定値演算手段であり、流量センサ８の測定値Ｑを入力し、これを変数として圧力設定値Ｐ１を従来システムと同様に次式で演算する。
Ｐ１＝Ｋ０＋Ｋ１・Ｑ＋Ｋ２・Ｑｎ In FIG. 1, reference numeral 13 denotes a pressure adjusting means, which operates the inverter 6 of the secondary water pump 5 with an output obtained by inputting a measured value P of the pressure sensor 12 and PID-calculating a deviation from the pressure set value. Reference numeral 14 denotes a set value calculating means for inputting the measured value Q of the flow sensor 8, and using this as a variable, the pressure set value P1 is calculated by the following equation as in the conventional system.
P1 = K0 + K1 · Q + K2 · Q n

１０１は第２の送りヘッダ７の流体温度を測定する第１温度センサであり、Ｔ１はその温度測定値である。１０２は戻りヘッダ２の流体温度を測定する第２温度センサであり、Ｔ２はその温度測定値である。   101 is a first temperature sensor for measuring the fluid temperature of the second feed header 7, and T1 is the temperature measurement value. Reference numeral 102 denotes a second temperature sensor for measuring the fluid temperature of the return header 2, and T2 is the temperature measurement value.

点線のブロック２００は設定値調整手段であり、設定値演算手段１４の圧力設定値Ｐ１に付加するオフセットＫを算出する。３００は乗算手段であり、圧力設定値Ｐ１及びオフセットＫを入力し、次式により圧力調節手段１３の圧力設定値Ｐ２を算出する。
Ｐ２＝（１＋Ｋ）×Ｐ１ A dotted line block 200 is a set value adjusting unit, and calculates an offset K to be added to the pressure set value P1 of the set value calculating unit 14. Reference numeral 300 denotes multiplication means, which inputs the pressure set value P1 and the offset K, and calculates the pressure set value P2 of the pressure adjusting means 13 by the following equation.
P2 = (1 + K) × P1

設定値調整手段２００において、２０１は差分計算手段であり、第１温度センサ１０１の測定値Ｔ１及び第２温度センサ１０２の測定値Ｔ２を入力し、その差である往還温度差ΔＴを算出する。   In the set value adjusting means 200, 201 is a difference calculating means, which inputs the measured value T1 of the first temperature sensor 101 and the measured value T2 of the second temperature sensor 102, and calculates the return temperature difference ΔT which is the difference between them.

２０２は判定値計算手段であり、往還温度差ΔＴ，温度差上限設定値，温度差下限設定値ΔＴＬを入力し、次の条件に従って判定値Ｅを算出する。
｜ΔＴ｜＞ΔＴＵであれば、Ｅ＝１
｜ΔＴ｜＜ΔＴＬであれば、Ｅ＝−１
それ以外では、Ｅ＝０ A reference value calculation unit 202 inputs the return temperature difference ΔT, the temperature difference upper limit set value, and the temperature difference lower limit set value ΔTL, and calculates the determination value E according to the following conditions.
If | ΔT |> ΔTU, E = 1
If | ΔT | <ΔTL, E = −1
Otherwise, E = 0

２０３はオフセット算出手段であり、判定値Ｅ，オフセット設定値Ｋ０，オフセット設定値Ｋ１を入力し、次の条件に従ってオフセットＫを算出する。
Ｅ＝１であれば、Ｋ＝Ｋ０
Ｅ＝−１であれば、Ｋ＝Ｋ１
それ以外では、Ｋ＝０ Reference numeral 203 denotes an offset calculation means for inputting the determination value E, the offset set value K0, and the offset set value K1, and calculating the offset K according to the following conditions.
If E = 1, K = K0
If E = -1, K = K1
Otherwise, K = 0

往還温度差ΔＴは、建物設計時に設定されている。温度差がこれよりも小さすぎる場合には、ポンプの送出圧力が高すぎる場合が多い。この場合、マイナスのオフセットＫ１を加えて省エネルギーを図る。同様に、温度差が大きすぎる場合、圧力が低すぎる場合がある。この場合、プラスのオフセットＫ０を加えて、圧力不足を防ぎ、制御特性を向上させる。   The return temperature difference ΔT is set at the time of building design. If the temperature difference is too small, the pump delivery pressure is often too high. In this case, energy is saved by adding a negative offset K1. Similarly, if the temperature difference is too large, the pressure may be too low. In this case, a plus offset K0 is added to prevent insufficient pressure and improve control characteristics.

図２は往還温度差ΔＴに基づくオフセット付加の他の実施形態を示す機能ブロック図である。図１との差を説明すれば、判定値計算手段２０２は、往還温度差ΔＴ及び温度差の設計値を入力して、判定値Ｅを次式で算出する。
Ｅ＝｜ΔＴ｜−ΔＴＳ FIG. 2 is a functional block diagram showing another embodiment of offset addition based on the return temperature difference ΔT. If the difference with FIG. 1 is demonstrated, the judgment value calculation means 202 will input the return temperature difference (DELTA) T and the design value of a temperature difference, and will calculate the judgment value E by following Formula.
E = | ΔT | −ΔTS

オフセット算出手段２０３は、テーブルを有し、判定値Ｅの極性及びレベルにより、次の条件に従ってテーブルを参照してオフセットＫを算出する。
Ｅ＜−２であれば、Ｋ＝−０．２
−２＜Ｅ＜２であれば、Ｋ＝０
２＜Ｅであれば、Ｋ＝０．２ The offset calculation means 203 has a table, and calculates the offset K by referring to the table according to the following conditions according to the polarity and level of the determination value E.
If E <−2, then K = −0.2
If -2 <E <2, K = 0
If 2 <E, K = 0.2

この実施形態では、測定された往還温度差ΔＴと往還温度差の設計値ΔＴＳとの比較により、付加されるオフセットを調整することでポンプの送出圧力を適正に調整して制御性を向上させている。   In this embodiment, by comparing the measured return trip temperature difference ΔT with the design value ΔTS of the return trip temperature difference, the added offset is adjusted to properly adjust the pump delivery pressure and improve controllability. Yes.

図３は、往還温度差ΔＴに基づくオフセット付加の更に他の実施形態を示す機能ブロック図である。図２の実施時形態では、往還温度差ΔＴと往還温度差の設計値ΔＴＳとの比較により、付加されるオフセットを調整したが、この実施形態ではオフセットではなく、設定値演算手段１４で関数演算する係数Ｋ０，Ｋ１，Ｋ２，ｎのセットを変更し、温度差によって管路抵抗のパターンを変更する。   FIG. 3 is a functional block diagram showing still another embodiment of offset addition based on the return temperature difference ΔT. In the embodiment shown in FIG. 2, the offset to be added is adjusted by comparing the return temperature difference ΔT and the design value ΔTS of the return temperature difference. In this embodiment, the offset is not an offset, and the function calculation is performed by the set value calculation means 14. The set of coefficients K0, K1, K2, and n to be changed is changed, and the pipe resistance pattern is changed depending on the temperature difference.

２０４は係数算出手段であり、係数Ｋ０，Ｋ１，Ｋ２，ｎのセットをあらかじめ設定したテーブルを有し、入力した判定値Ｅの値に基づいてこのテーブルより係数のセットを読み出して設定値演算手段１４に渡して管路抵抗のパターンを変更させる。   204 is a coefficient calculation means, which has a table in which a set of coefficients K0, K1, K2, and n is set in advance, reads a set of coefficients from this table based on the value of the input judgment value E, and sets a set value calculation means 14 to change the line resistance pattern.

図４は、送水ポンプの運転台数に基づいて送水圧力設定値に付加するオフセットを算出する設定値調整手段を設けた実施形態を示すブロック図である。２１は台数制御コントローラであり、図８の従来システムと同一機能である。   FIG. 4 is a block diagram showing an embodiment provided with a set value adjusting means for calculating an offset to be added to the water supply pressure set value based on the number of operating water pumps. Reference numeral 21 denotes a number control controller having the same function as that of the conventional system of FIG.

４００は台数変動検出手段であり、二次送水ポンプ５に設けられたリミットスイッチ手段（図示せず）よりポンプ起動情報を取得し、変動台数信号Ｍを設置値調整手段２００に発信する。   Reference numeral 400 denotes a number fluctuation detecting means, which obtains pump activation information from a limit switch means (not shown) provided in the secondary water pump 5 and transmits a fluctuation number signal M to the installation value adjusting means 200.

２０５は、設置値調整手段２００に設けたオフセット算出手段であり、テーブル手段を備えていて、変動台数信号Ｍが増加信号であればオフセットＫの値として−０．１を、減少信号であればオフセットＫの値として＋０．２を読み出して乗算手段３００に出力する。   Reference numeral 205 denotes offset calculation means provided in the installation value adjustment means 200. The offset calculation means 205 includes a table means. If the variable number signal M is an increase signal, -0.1 is set as an offset K value, and if it is a decrease signal. As a value of the offset K, +0.2 is read and output to the multiplication unit 300.

２０６はオフセットタイマーであり、送水ポンプの運転台数の変動後、指定の時間にわたってオフセットＫを出力する。   Reference numeral 206 denotes an offset timer, which outputs an offset K over a specified time after the number of operating water pumps varies.

図５は、送水ポンプの運転台数に基づいて送水圧力設定値に付加するオフセットを算出する他の実施形態を示す機能ブロック図である。図４の実施形態と比較した特徴点は、設定値調整手段２００が、送水ポンプの運転台数の変動比率値及び感度係数値に基づいて前記送水圧力設定値に付加するオフセットを算出する構成にある。   FIG. 5 is a functional block diagram showing another embodiment for calculating an offset to be added to the water supply pressure set value based on the number of operating water pumps. The feature point compared with the embodiment of FIG. 4 is that the set value adjusting means 200 calculates an offset to be added to the water supply pressure set value based on the fluctuation ratio value and sensitivity coefficient value of the number of water pumps in operation. .

設定値調整手段２００において、２０７は変動比率算出手段であり、変動台数信号Ｍの変動前と変動後の台数変化の比率Ｒを算出する。２０８はオフセット算出手段であり、比率Ｒと設定される感度係数αを入力し、Ｋ＝α×Ｒで算出されるオフセットＫを乗算手段３００に出力する。   In the set value adjusting means 200, reference numeral 207 denotes a fluctuation ratio calculating means, which calculates the ratio R of the number change before and after the change of the variable number signal M. Reference numeral 208 denotes an offset calculation unit that inputs the ratio R and the sensitivity coefficient α that is set, and outputs the offset K calculated by K = α × R to the multiplication unit 300.

オフセットタイマー２０６の機能は、図４と同様であり送水ポンプの運転台数の変動後、指定の時間にわたってオフセットＫを出力する。   The function of the offset timer 206 is the same as that in FIG. 4, and the offset K is output over a specified time after the number of operating water pumps varies.

図４、図５の実施形態では、送水ポンプの台数増加時に、過大な圧力がかかるのを防ぐと共に、ポンプの減段時に圧力不足になるのを防ぐことができる。図４の実施形態では、変動前の台数と変動後の台数を考慮せず、増加ならＸＸ％、減段ならＹＹ％と一律でオフセットを加えていたが、例えば４台が３台に減る場合は、圧力は４／３倍する必要があり、２台が１台に減る場合は、圧力は２／１倍にする必要がある。   In the embodiment of FIGS. 4 and 5, it is possible to prevent an excessive pressure from being applied when the number of water pumps is increased, and to prevent the pressure from becoming insufficient when the pumps are stepped down. In the embodiment of FIG. 4, the number before the change and the number after the change are not taken into account, and the offset is uniformly added to XX% when increasing, and YY% when decreasing, but for example, when 4 units are reduced to 3 units The pressure needs to be 4/3 times, and when 2 units are reduced to 1 unit, the pressure needs to be 2/1 times.

図５の実施形態では、変動前と変動後の台数を使って、変動前台数／変動後台数の比率Ｒに指定した係数αをかけて、タイマーにより指定した時間だけ、圧力設定値にオフセットＫを付加する機能を持たせることで、より高度の制御性を実現している。   In the embodiment of FIG. 5, using the number before and after the change, multiply the ratio R between the number before change / the number after change by the specified coefficient α, and offset K to the pressure set value for the time specified by the timer. A higher level of controllability is achieved by providing a function to add.

図６は、図１乃至図５の設定値調整手段とは異なるパラメータ調整手段５００を備えた実施形態を示す機能ブロック図である。従来システムでは、送水ポンプの送水圧力設定値を与える関数の係数Ｋ０，Ｋ１，Ｋ２，ｎのセットを変更する機能を有していたが、本発明では係数セットを変更する際に、この係数セットに対応した前記圧力調節手段のＰＩＤ制御パラメータのセットを最適値に調整する機能を追加する。更に、必要に応じて送水ポンプの回転数の上限値ＳＨ及び下限値ＳＬのセットを調整する機能を追加する。   FIG. 6 is a functional block diagram showing an embodiment provided with parameter adjustment means 500 different from the set value adjustment means of FIGS. 1 to 5. The conventional system has a function of changing the set of coefficients K0, K1, K2, and n of the function that gives the water pressure setting value of the water pump. In the present invention, this coefficient set is changed when the coefficient set is changed. A function for adjusting the set of PID control parameters of the pressure adjusting means corresponding to the above to an optimum value is added. Furthermore, a function for adjusting the set of the upper limit value SH and the lower limit value SL of the rotation speed of the water pump is added as necessary.

５０１は、テーブル手段を備えた係数算出手段であり、季節毎に変更される関数の係数セットに追加されてＰＩＤパラメータ及びＳＨ，ＳＬのセットがテーブル化されており、このテーブルからの読み出し情報により、設定値演算手段１４の関数演算係数のセット及び圧力調節手段１３のＰＩＤ制御パラメータＳＨ，ＳＬのセットが一括して変更される。図７は、係数算出手段５０１のテーブル構成図である。   A coefficient calculation unit 501 includes a table unit, and is added to a coefficient set of a function that is changed for each season, and a set of PID parameters and SH and SL are tabulated. By reading information from the table, The set of function calculation coefficients of the set value calculation means 14 and the set of PID control parameters SH and SL of the pressure adjustment means 13 are changed at once. FIG. 7 is a table configuration diagram of the coefficient calculation means 501.

図１乃至図６の実施形態では、圧力センサ１２は第２お送りヘッダ７の送水圧力を測定する絶対圧力センサの形態を示したが、従来システムで採用されているように第２送りヘッダ７と戻りヘッダ２間の差圧を測定する差圧センサの形態であっても本発明により得られる効果は同一である。   In the embodiment shown in FIGS. 1 to 6, the pressure sensor 12 is an absolute pressure sensor that measures the water supply pressure of the second feed header 7. Even in the form of a differential pressure sensor that measures the differential pressure between the return headers 2, the effect obtained by the present invention is the same.

本発明を適用した送水ポンプ制御システムの一実施形態を示す機能ブロック図である。It is a functional block diagram showing one embodiment of a water pump control system to which the present invention is applied. 往還温度差に基づくオフセット付加の他の実施形態を示す機能ブロック図である。It is a functional block diagram which shows other embodiment of offset addition based on a return temperature difference. 往還温度差に基づくオフセット付加の更に他の実施形態を示す機能ブロック図である。It is a functional block diagram which shows other embodiment of offset addition based on a return temperature difference. 送水ポンプの運転台数に基づくオフセット付加の実施形態を示すブロック図である。It is a block diagram showing an embodiment of offset addition based on the number of operating water pumps. 送水ポンプの運転台数に基づくオフセット付加の他の実施形態を示すブロック図である。It is a block diagram which shows other embodiment of offset addition based on the driving | running number of water pumps. パラメータ調整手段を備えた実施形態を示す機能ブロック図である。It is a functional block diagram which shows embodiment provided with the parameter adjustment means. パラメータ調整手段における係数算出手段のテーブル構成図である。It is a table block diagram of the coefficient calculation means in a parameter adjustment means. 特許文献１に開示されている従来の送水ポンプ制御システムの一例を示す機能ブロック図である。It is a functional block diagram which shows an example of the conventional water pump control system currently disclosed by patent document 1. FIG. 流量Ｑに対して演算される送水圧力Ｐ１の特性曲線図である。It is a characteristic curve figure of the water supply pressure P1 calculated with respect to the flow volume Q. 特性変動幅に対して動作マージンを考慮して設定した管路抵抗特性曲線図である。It is a pipe resistance characteristic curve diagram set in consideration of an operation margin with respect to the characteristic fluctuation range.

符号の説明Explanation of symbols

１ 一次送水ポンプ
２ 戻りヘッダ
３ 熱源
４ 第１の送りヘッダ
５ 二次送水ポンプ
６ インバータ
７ 第２の送りヘッダ
８ 流量センサ
９ 制御二方弁
１１ 熱交換器
１２ 圧力センサ
１３ 圧力調節手段
１４ 設定値演算手段
１０１ 第１温度センサ
１０２ 第２温度センサ
２００ 設定値調整手段
２０１ 差分計算手段
２０２ 判定値計算手段
２０３ オフセット算出手段
３００ 乗算手段
DESCRIPTION OF SYMBOLS 1 Primary water pump 2 Return header 3 Heat source 4 First feed header 5 Secondary water pump 6 Inverter 7 Second feed header 8 Flow rate sensor 9 Control two-way valve 11 Heat exchanger 12 Pressure sensor 13 Pressure adjusting means 14 Set value Calculation means 101 First temperature sensor 102 Second temperature sensor 200 Set value adjustment means 201 Difference calculation means 202 Determination value calculation means 203 Offset calculation means 300 Multiplication means

Claims (6)

熱交換器に送水する送水ポンプの送水圧力を、送水流量に応じて決まる管路抵抗特性の大きさに応じて圧力調節手段により制御する送水ポンプ制御システムにおいて、
前記熱交換器に送る水の温度と熱交換器から戻ってきた水の温度差となる往還温度差または前記送水ポンプの運転台数情報に基づいて前記圧力調節手段に設定する送水圧力設定値に付加するオフセットを調整する設定値調整手段を設けたことを特徴とする送水ポンプ制御システム。 In the water supply pump control system that controls the water supply pressure of the water supply pump that supplies water to the heat exchanger by the pressure adjusting means according to the size of the pipe resistance characteristic determined according to the water supply flow rate,
Added to the water supply pressure set value set in the pressure adjusting means based on the difference between the temperature of the water sent to the heat exchanger and the return temperature difference which is the temperature difference of the water returned from the heat exchanger or the number of operating pumps. A water supply pump control system comprising a set value adjusting means for adjusting the offset to be performed. 前記設定値調整手段は、前記往還温度差と往還温度差の上限値及び下限値に基づいて前記送水圧力設定値に付加するオフセットを算出することを特徴とする請求項１に記載の送水ポンプ制御システム。 The water supply pump control according to claim 1, wherein the set value adjusting means calculates an offset to be added to the water supply pressure set value based on an upper limit value and a lower limit value of the return temperature difference and the return temperature difference. system. 前記設定値調整手段は、前記往還温度差と往還温度差の設計値に基づいて前記送水圧力設定値に付加するオフセットを算出することを特徴とする請求項１に記載の送水ポンプ制御システム。 The water supply pump control system according to claim 1, wherein the set value adjusting unit calculates an offset to be added to the water supply pressure set value based on a design value of the return temperature difference and the return temperature difference. 前記設定値調整手段は、前記送水ポンプの運転台数変動に基づいて前記送水圧力設定値に付加するオフセットを算出することを特徴とする請求項１に記載の送水ポンプ制御システム。 The water supply pump control system according to claim 1 , wherein the set value adjusting means calculates an offset to be added to the water supply pressure set value based on a change in the number of operating water pumps. 前記設定値調整手段は、前記送水ポンプの運転台数の変動比率値及び感度係数値に基づいて前記送水圧力設定値に付加するオフセットを算出することを特徴とする請求項１に記載の送水ポンプ制御システム。 2. The water pump control according to claim 1 , wherein the set value adjusting means calculates an offset to be added to the water pressure setting value based on a fluctuation ratio value and a sensitivity coefficient value of the number of operating water pumps. system. 前記設定値調整手段は、前記送水ポンプの運転台数の変動後、指定の時間にわたって前記オフセットを出力するオフセットタイマーを備えたことを特徴とする請求項４又は５に記載の送水ポンプ制御システム。 6. The water pump control system according to claim 4, wherein the set value adjusting means includes an offset timer that outputs the offset over a specified time after the number of operating water pumps fluctuates.
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