JP2019002343A - Boost water supply apparatus - Google Patents
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- JP2019002343A JP2019002343A JP2017117534A JP2017117534A JP2019002343A JP 2019002343 A JP2019002343 A JP 2019002343A JP 2017117534 A JP2017117534 A JP 2017117534A JP 2017117534 A JP2017117534 A JP 2017117534A JP 2019002343 A JP2019002343 A JP 2019002343A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 85
- 230000002265 prevention Effects 0.000 claims abstract description 51
- 238000000034 method Methods 0.000 claims abstract description 41
- 238000001514 detection method Methods 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims description 13
- 238000009428 plumbing Methods 0.000 claims description 2
- 230000007423 decrease Effects 0.000 description 11
- 239000007788 liquid Substances 0.000 description 6
- 230000008859 change Effects 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 239000000470 constituent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 102100035353 Cyclin-dependent kinase 2-associated protein 1 Human genes 0.000 description 1
- 101000760620 Homo sapiens Cell adhesion molecule 1 Proteins 0.000 description 1
- 101001139126 Homo sapiens Krueppel-like factor 6 Proteins 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000009972 noncorrosive effect Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
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Abstract
Description
本発明は、増圧給水装置及び増圧給水装置の制御方法に関する。 The present invention relates to a pressure-increasing water supply device and a control method for the pressure-increasing water supply device.
増圧給水装置において、ポンプ運転時に吸込圧力が上昇した場合にポンプを停止させる、いわゆる高配水圧停止機能を備えることが義務づけられている。 In the pressure-increasing water supply apparatus, it is obliged to have a so-called high water distribution pressure stop function that stops the pump when the suction pressure increases during pump operation.
このような増圧給水装置において、ポンプと、モータと、ポンプの一次側の流路に設けられた減圧弁式逆流防止装置と、ポンプの二次側に設けられたアキュムレータと、を備え、配管としてポンプの一次側の吸込管と、ポンプの二次側の吐出管と、吸込管と吐出管を連通するバイパス管と、を備えるものが知られている（例えば、特許文献１参照）。吸込管にはストレーナや閉止弁が設けられている。 In such a pressure-increasing water supply device, a pipe, a motor, a pressure reducing valve type backflow prevention device provided in the flow path on the primary side of the pump, and an accumulator provided on the secondary side of the pump, As such, a pump including a suction pipe on the primary side of the pump, a discharge pipe on the secondary side of the pump, and a bypass pipe communicating the suction pipe and the discharge pipe is known (for example, see Patent Document 1). The suction pipe is provided with a strainer and a shut-off valve.
例えば吸込側圧力が正圧となる増圧給水装置においては、ポンプ運転中に吸込圧力が目標圧力以上に上昇した場合に、ポンプを自動停止し、バイパス流路とポンプを経由して直圧給水する機能が日本水道協会規格に定められている。 For example, in a booster water supply system in which the suction side pressure becomes positive pressure, when the suction pressure rises above the target pressure during pump operation, the pump is automatically stopped and direct pressure water supply is made via the bypass channel and the pump. The function to do is stipulated in the Japan Water Works Association standard.
この場合、例えば、閉止弁とストレーナと減圧弁式の逆流防止装置の圧力損失が最低で約６ｍであると、ポンプを停止した場合の吐出圧力は「目標圧力−６ｍ」まで低下する。一方で、吐出圧力一定制御方式の場合、始動圧力は「目標圧力−４ｍ」程度となる。したがって、ポンプの運転中にアキュムレータに蓄えられた水が流出して、吐出圧力が「目標圧力−４ｍ」まで低下すると、ポンプが再始動するといったハンチング現象が生じる場合がある。そこで、圧力損失を考慮してマージンを設定することも考えられるが、閉止弁とストレーナと減圧弁式逆流防止装置の圧力損失は、口径や給水量に伴って複雑に変化することから、圧力損失を考慮した設定は困難である。 In this case, for example, if the pressure loss of the stop valve, the strainer, and the pressure reducing valve type backflow prevention device is at least about 6 m, the discharge pressure when the pump is stopped decreases to "target pressure -6 m". On the other hand, in the case of the discharge pressure constant control method, the starting pressure is about “target pressure—4 m”. Therefore, when the water stored in the accumulator flows out during the operation of the pump and the discharge pressure decreases to “target pressure −4 m”, a hunting phenomenon that the pump restarts may occur. Therefore, it is conceivable to set a margin in consideration of pressure loss, but the pressure loss of the closing valve, strainer, and pressure reducing valve backflow prevention device changes in a complex manner with the diameter and water supply amount. It is difficult to set in consideration of
そこで、本発明は、ハンチング現象を防止できる増圧給水装置を提供することを目的とする。 Then, an object of this invention is to provide the pressure increase water supply apparatus which can prevent a hunting phenomenon.
本発明の一形態にかかる増圧給水装置は、ポンプと、前記ポンプの一次側に配された逆流防止装置と、前記逆流防止装置の一次側に配され、前記ポンプの吸込側の第１吸込圧力を検出する第１吸込圧力検出部と、前記逆流防止装置と前記ポンプの間に配され、前記ポンプの吸込側の第２吸込圧力を検出する第２吸込圧力検出部と、前記ポンプの二次側に配され、前記ポンプの吐出側の吐出圧力を検出する吐出圧力検出部と、前記吐出圧力に基づいて前記ポンプの出力を制御するとともに、前記ポンプの運転中に前記第１吸込圧力が目標圧力である第１基準値以上であって、かつ前記第２吸込圧力が前記第１基準値より低く設定された始動圧力である第２基準値以上となる状態が所定時間継続した場合に、前記ポンプを停止するとともに、前記ポンプの停止中に第１吸込圧力が第１基準値未満もしくは第２吸込圧力が第２基準値未満となった場合、前記ポンプを再始動する制御部と、を備える。 A pressure increase water supply apparatus according to an aspect of the present invention includes a pump, a backflow prevention device disposed on a primary side of the pump, and a primary suction on a suction side of the pump, disposed on a primary side of the backflow prevention device. A first suction pressure detection unit that detects pressure, a second suction pressure detection unit that is disposed between the backflow prevention device and the pump and detects a second suction pressure on the suction side of the pump; A discharge pressure detector arranged on the secondary side for detecting the discharge pressure on the discharge side of the pump; and controlling the output of the pump based on the discharge pressure, and the first suction pressure during operation of the pump. When a state in which the pressure is equal to or higher than a first reference value that is a target pressure and the second suction pressure is equal to or higher than a second reference value that is a starting pressure set lower than the first reference value continues for a predetermined time, While stopping the pump, the When the first suction pressure during stopping of the pump is or second suction pressure lower than the first reference value is less than the second reference value, and a control unit to restart the pump.
本発明によればハンチング現象を防止できる増圧給水装置を提供することができる。 ADVANTAGE OF THE INVENTION According to this invention, the pressure increase water supply apparatus which can prevent a hunting phenomenon can be provided.
以下、本発明の一実施形態にかかる増圧給水装置１について、図１乃至図６を参照して説明する。図１及び図２は増圧給水装置の側面図であり、カバーを切欠して内部構造を示すとともに、一部構造を断面にて示す。なお、図２は、図３におけるＩＩ−ＩＩ線から見た側面図である。図４及び図５は増圧給水装置１の制御手順を示すフローチャートである。図６は増圧給水装置１の制御における目標圧力を示すグラフであり、推定末端圧一定制御時の揚程と流量の関係を示している。 Hereinafter, the pressure increase water supply apparatus 1 concerning one Embodiment of this invention is demonstrated with reference to FIG. 1 thru | or FIG. FIG.1 and FIG.2 is a side view of a pressure increase water supply apparatus, and it notches a cover, shows an internal structure, and shows a partial structure in cross section. FIG. 2 is a side view taken along line II-II in FIG. 4 and 5 are flowcharts showing the control procedure of the pressure-increasing water supply apparatus 1. FIG. 6 is a graph showing the target pressure in the control of the pressure-increasing water supply apparatus 1, and shows the relationship between the head and the flow rate during the constant terminal pressure constant control.
図１に示すように、増圧給水装置は、複数のポンプ装置１１と、配管１２と、逆流防止装置１３と、第１吸込圧力検出部である第１圧力センサ１４と、第２吸込圧力検出部である第２圧力センサ１５と、吐出圧力検出部である第３圧力センサ１６と、流量検出部である流量センサ１７と、電装部１８と、これらを収容するポンプカバー１９と、を備える。 As shown in FIG. 1, the pressure increasing water supply device includes a plurality of pump devices 11, a pipe 12, a backflow prevention device 13, a first pressure sensor 14 that is a first suction pressure detection unit, and a second suction pressure detection. A second pressure sensor 15 that is a discharge portion, a third pressure sensor 16 that is a discharge pressure detection unit, a flow rate sensor 17 that is a flow rate detection unit, an electrical unit 18, and a pump cover 19 that accommodates these.
ポンプ装置１１は、モータ２１と、モータ２１に接続されたインペラ２２を有する１段または複数段のポンプ２３と、を備え、流体を増圧して二次側に圧送する。本実施形態においては一対のポンプ装置１１が縦置きの状態で設置されている。 The pump device 11 includes a motor 21 and a single-stage or multiple-stage pump 23 having an impeller 22 connected to the motor 21, and increases the pressure of the fluid and pumps it to the secondary side. In the present embodiment, the pair of pump devices 11 are installed in a vertical state.
ポンプ２３は、下端部にポンプ吸込口２３ａを有し、上部の側部にポンプ吐出口２３ｂを有している。ポンプ吸込口２３ａには配管１２の吸込連結管３２が接続される。ポンプ吐出口２３ｂには個別吐出流路を形成する個別吐出管３４が接続される。 The pump 23 has a pump suction port 23a at the lower end and a pump discharge port 23b on the upper side. A suction coupling pipe 32 of the pipe 12 is connected to the pump suction port 23a. An individual discharge pipe 34 that forms an individual discharge channel is connected to the pump discharge port 23b.
各モータ２１はケーブを介して電装部１８の制御部に接続されている。ポンプ装置１１は、制御部の制御によりモータ２１が駆動されることで、運転制御される。 Each motor 21 is connected to the control unit of the electrical unit 18 via a cable. The pump device 11 is controlled by driving the motor 21 under the control of the control unit.
配管１２は、逆流防止装置１３の一次側に配される吸込配管３１と、逆流防止装置１３の二次側に配される吸込連結管３２と、吸込連結管３２から分岐して各ポンプ２３のポンプ吸込口２３ａに至る一対のボール弁３３と、ポンプ２３のポンプ吐出口２３ｂに接続される複数の個別吐出管３４と、複数の個別吐出管３４とボール弁３３とを連通する吐出連結管３５と、吐出連結管３５と吸込連結管３２を接続するバイパス連結管３６と、を備える。 The pipe 12 branches from the suction pipe 31 arranged on the primary side of the backflow prevention device 13, the suction connection pipe 32 arranged on the secondary side of the backflow prevention device 13, and the suction connection pipe 32. A pair of ball valves 33 reaching the pump suction port 23 a, a plurality of individual discharge pipes 34 connected to the pump discharge port 23 b of the pump 23, and a discharge connecting pipe 35 communicating the plurality of individual discharge pipes 34 and the ball valve 33. And a bypass connection pipe 36 that connects the discharge connection pipe 35 and the suction connection pipe 32.
吸込配管３１は縦に延び、下端側に吸込口１２ａを有している。吸込口１２ａ近傍にはストレーナ３７が設けられている。吸込配管３１には第１の圧力検出部としての第１圧力センサ１４が設けられている。第１圧力センサ１４は、吸込配管３１内の圧力、すなわち逆流防止装置１３の一次側の圧力である第１吸込圧力ＰＳ１を検出する。吸込配管３１の他端は逆流防止装置１３に接続される。 The suction pipe 31 extends vertically and has a suction port 12a on the lower end side. A strainer 37 is provided in the vicinity of the suction port 12a. The suction pipe 31 is provided with a first pressure sensor 14 as a first pressure detector. The first pressure sensor 14 detects the pressure in the suction pipe 31, that is, the first suction pressure PS <b> 1 that is the primary pressure of the backflow prevention device 13. The other end of the suction pipe 31 is connected to the backflow prevention device 13.
逆流防止装置１３は、吸込配管３１と吸込連結管３２との間に設けられている。逆流防止装置１３は、第１の逆止弁１３ａと、第２の逆止弁１３ｂと、リテーナ１３ｃと、逃がし弁と、を備え、流路における液体の流れの方向を一方向に規制する。 The backflow prevention device 13 is provided between the suction pipe 31 and the suction connection pipe 32. The backflow prevention device 13 includes a first check valve 13a, a second check valve 13b, a retainer 13c, and a relief valve, and regulates the liquid flow direction in the flow path in one direction.
吸込連結管３２は管状部材であり、逆流防止装置１３の二次側に接続される。吸込連結管３２は例えば２台のポンプ装置１１の下方において水平に延びている。吸込連結管３２には第２の圧力検出部としての第２圧力センサ１５が設けられている。第２圧力センサ１５は、吸込連結管３２内の圧力、すなわち逆流防止装置１３の二次側であってポンプ装置１１の一次側の、ポンプ吸込圧力である第２吸込圧力ＰＳ２を検出する。 The suction connection pipe 32 is a tubular member and is connected to the secondary side of the backflow prevention device 13. For example, the suction connection pipe 32 extends horizontally below the two pump devices 11. The suction connection pipe 32 is provided with a second pressure sensor 15 as a second pressure detection unit. The second pressure sensor 15 detects the pressure in the suction connection pipe 32, that is, the second suction pressure PS <b> 2 that is the pump suction pressure on the secondary side of the backflow prevention device 13 and the primary side of the pump device 11.
一対のボール弁３３は、一対のポンプ２３のポンプ吸込口２３ａにそれぞれ接続されている。 The pair of ball valves 33 are connected to the pump suction ports 23a of the pair of pumps 23, respectively.
個別吐出管３４は、管状部材であり、その一端がポンプ２３の側壁部に配されるポンプ吐出口２３ｂに接続されている。個別吐出管３４は、ポンプ吐出口２３ｂから前方に延び、屈曲して下方に延び、下方に設けられた吐出連結管３５に接続されている。個別吐出管３４内であってポンプ吐出口に近い所定箇所には、流れ方向を一方向に規制する逆止弁５２が設けられている。また、個別吐出管３４の中途部には、個別吐出管３４内の液体の流量を検出する流量検出部である流量センサ１７がそれぞれ設けられている。 The individual discharge pipe 34 is a tubular member, and one end of the individual discharge pipe 34 is connected to a pump discharge port 23 b disposed on the side wall of the pump 23. The individual discharge pipe 34 extends forward from the pump discharge port 23b, bends and extends downward, and is connected to a discharge connecting pipe 35 provided below. A check valve 52 that restricts the flow direction in one direction is provided at a predetermined location in the individual discharge pipe 34 close to the pump discharge port. A flow rate sensor 17 that is a flow rate detection unit that detects the flow rate of the liquid in the individual discharge tube 34 is provided in the middle of the individual discharge tube 34.
吐出連結管３５は管状部材であり、複数の個別吐出管３４に接続されたボール弁３３の二次側に接続される。吐出連結管３５は例えば縦置きの２台のポンプ装置１１の下方において水平に延び、吸込連結管３２と並列に配置されている。吐出連結管３５は一端が閉口し、他端には蛇口などの給水先に接続される吐出口１２ｂを有する。吐出連結管３５には第３の圧力検出部としての第３圧力センサ１６が設けられている。第３圧力センサ１６は、吐出連結管３５内の圧力、すなわちポンプ２３の二次側のポンプ吐出圧力を検出する。吐出連結管３５の吐出口近傍には、圧力を蓄えるためのアキュムレータ４１が設けられている。 The discharge connecting pipe 35 is a tubular member, and is connected to the secondary side of the ball valve 33 connected to the plurality of individual discharge pipes 34. For example, the discharge connection pipe 35 extends horizontally below the two vertically installed pump devices 11 and is arranged in parallel with the suction connection pipe 32. One end of the discharge connecting pipe 35 is closed, and the other end has a discharge port 12b connected to a water supply destination such as a faucet. The discharge connecting pipe 35 is provided with a third pressure sensor 16 as a third pressure detection unit. The third pressure sensor 16 detects the pressure in the discharge connecting pipe 35, that is, the pump discharge pressure on the secondary side of the pump 23. An accumulator 41 for storing pressure is provided in the vicinity of the discharge port of the discharge connecting pipe 35.
バイパス連結管３６は管状部材であり、吐出連結管３５と吸込連結管３２とを連通するバイパス流路３６ａを形成している。バイパス連結管３６内の所定箇所には、流れ方向を一方向に規制する逆止弁５１が設けられている。 The bypass connection pipe 36 is a tubular member, and forms a bypass flow path 36 a that connects the discharge connection pipe 35 and the suction connection pipe 32. A check valve 51 that restricts the flow direction in one direction is provided at a predetermined location in the bypass connecting pipe 36.
第１圧力センサ１４、第２圧力センサ１５、及び第３圧力センサ１６は、例えばピエゾ効果を利用した半導体式の圧力センサである。圧力センサ１４，１５，１６は、センサーボディの孔部に設けられたダイヤフラムと、ダイヤフラムの上部に設けられた歪みゲージと、ダイヤフラム及び歪みゲージの間に設けられた液室と、液室に充填された非腐食性液体、例えばシリコンオイルと、を備える。 The 1st pressure sensor 14, the 2nd pressure sensor 15, and the 3rd pressure sensor 16 are semiconductor type pressure sensors using a piezo effect, for example. The pressure sensors 14, 15, and 16 are filled in a diaphragm provided in a hole of the sensor body, a strain gauge provided in an upper portion of the diaphragm, a liquid chamber provided between the diaphragm and the strain gauge, and a liquid chamber Non-corrosive liquid, such as silicone oil.
圧力センサ１４，１５，１６は、配管１２内の圧力を検出し、アナログ電圧出力可能に構成されている。圧力センサ１４，１５，１６は、ダイヤフラムが配管１２内の圧力により変化したときに、液室内のシリコンオイルによって歪みゲージに圧力が印加され、当該圧力に応じた歪みゲージの歪み量を信号に変換することで、圧力を検出する。圧力センサ１４，１５，１６は、信号線を介して電装部１８の制御部１８ｂに接続され、検出した圧力信号を制御部１８ｂに接続されている。 The pressure sensors 14, 15, and 16 are configured to detect the pressure in the pipe 12 and output analog voltage. When the diaphragm changes due to the pressure in the pipe 12, the pressure sensors 14, 15, and 16 apply pressure to the strain gauge by silicon oil in the liquid chamber, and convert the strain gauge strain amount corresponding to the pressure into a signal. By doing so, the pressure is detected. The pressure sensors 14, 15, and 16 are connected to the control unit 18b of the electrical unit 18 through signal lines, and the detected pressure signal is connected to the control unit 18b.
流量センサ１７は例えば磁石が設けられた羽根車を備え、磁石に接続されたホールＩＣにて流量検出を行う回転式のセンサである。 The flow sensor 17 is a rotary sensor that includes, for example, an impeller provided with a magnet, and detects the flow rate with a Hall IC connected to the magnet.
電装部１８は、各種情報を記憶する記憶部としての記憶装置１８ａと、制御部１８ｂと、各ポンプに接続されたインバータ１８ｃと、を備える。 The electrical unit 18 includes a storage device 18a as a storage unit that stores various types of information, a control unit 18b, and an inverter 18c connected to each pump.
記憶装置１８ａは、例えば、制御に必要な情報として、各種プログラムや各種基準値や閾値を記憶する。例えば記憶装置１８ａには、制御に必要な情報として、変動基準値ΔＰｖ１、第１基準値Ｐｔ１，第２基準値Ｐｔ２，第３基準値Ｐｔ３，第４基準値Ｐｔ４、第５基準値Ｐｔ５、差圧の基準値Ｐｔ６、Ｐｔ７等の数値が閾値として記憶されている。 For example, the storage device 18a stores various programs, various reference values, and threshold values as information necessary for control. For example, the storage device 18a includes, as information necessary for control, a fluctuation reference value ΔPv1, a first reference value Pt1, a second reference value Pt2, a third reference value Pt3, a fourth reference value Pt4, a fifth reference value Pt5, a difference. Numerical values such as pressure reference values Pt6 and Pt7 are stored as threshold values.
制御部１８ｂは、予め記憶装置１８ａに記憶された各種プログラムに従って、複数のポンプ装置１１の動作を制御する。具体的には、制御部１８ｂは、各インバータ１８ｃに制御信号を送信し各ポンプ装置１１に対応するインバータ１８ｃを制御する。例えば制御部１８ｂは、各センサによって検出される検出値に基づき、各種の演算処理を行い、インバータ１８ｃの周波数制御により、ポンプ装置１１のモータ２１を変速運転し、または停止させる。具体的には、制御部１８ｂは、吐出圧力が目標圧力値になるように、推定末端圧一定制御する。 The control unit 18b controls operations of the plurality of pump devices 11 according to various programs stored in the storage device 18a in advance. Specifically, the control unit 18 b transmits a control signal to each inverter 18 c to control the inverter 18 c corresponding to each pump device 11. For example, the control unit 18b performs various arithmetic processes based on the detection values detected by the sensors, and shifts or stops the motor 21 of the pump device 11 by frequency control of the inverter 18c. Specifically, the control unit 18b performs constant control of the estimated terminal pressure so that the discharge pressure becomes the target pressure value.
インバータ１８ｃは、信号線によってポンプ装置１１のモータ２１に電気的に接続されている。インバータ１８ｃは制御部１８ｂからの制御信号に応じた所定の周波数を出力することで、ポンプ装置１１のモータ２１を所定の回転速度で回転させる。 The inverter 18c is electrically connected to the motor 21 of the pump device 11 through a signal line. The inverter 18c outputs a predetermined frequency according to a control signal from the control unit 18b, thereby rotating the motor 21 of the pump device 11 at a predetermined rotation speed.
次に、本実施形態にかかる増圧給水装置１の制御方法について、図４及び図５を参照して説明する。図４及び図５は本実施形態にかかる制御部１８ｂのフローチャートである。 Next, the control method of the pressure increase water supply apparatus 1 concerning this embodiment is demonstrated with reference to FIG.4 and FIG.5. 4 and 5 are flowcharts of the control unit 18b according to the present embodiment.
制御部１８ｂは、ステップＳＴ１として、ポンプ装置１１を運転する指示を検出する。制御部１８ｂは、外部入力指示などによりポンプ装置１１を運転する指示を検出すると（ステップＳＴ１のＹｅｓ）、ステップＳＴ２として各種データを検出するとともに、ステップＳＴ３としてポンプの運転を開始する。 The control part 18b detects the instruction | indication which operates the pump apparatus 11 as step ST1. When the controller 18b detects an instruction to operate the pump device 11 by an external input instruction or the like (Yes in step ST1), the controller 18b detects various data as step ST2 and starts operating the pump as step ST3.
ステップＳＴ２において、制御部１８ｂは各種圧力センサ及び流量センサで検出した圧力値及び流量値を検出する。 In step ST2, the controller 18b detects pressure values and flow values detected by various pressure sensors and flow sensors.
ステップＳＴ３において、制御部１８ｂは、インバータ１８ｃに制御信号を出力することで、ポンプ装置１１を駆動する。ここでは、２台のポンプ装置１１を、交互運転する。インバータ１８ｃは制御信号に応じた所定の周波数を出力することで、ポンプ装置１１のモータ２１を所定の回転速度で回転させる。このとき、制御部１８ｂは、吐出圧力Ｐｄが変動目標圧力値Ｐｄｖになるように、推定末端圧一定にて制御する。 In step ST3, the control unit 18b drives the pump device 11 by outputting a control signal to the inverter 18c. Here, the two pump devices 11 are operated alternately. The inverter 18c outputs a predetermined frequency according to the control signal, thereby rotating the motor 21 of the pump device 11 at a predetermined rotation speed. At this time, the control unit 18b performs control with the estimated terminal pressure being constant so that the discharge pressure Pd becomes the fluctuation target pressure value Pdv.
具体的には、ステップＳＴ４として、制御部１８ｂは、一定時間（例：１秒）当りの第２吸込圧力Ｐｓ２の変動量ΔＰｓ２を検出し、第２吸込圧力Ｐｓ２の変動量ΔＰｓ２が所定の変動基準値ΔＰｖ１以上であるか否かを判定する。 Specifically, as step ST4, the control unit 18b detects the fluctuation amount ΔPs2 of the second suction pressure Ps2 per fixed time (eg, 1 second), and the fluctuation amount ΔPs2 of the second suction pressure Ps2 is a predetermined fluctuation. It is determined whether or not the reference value ΔPv1 or more.
そして、第２吸込圧力の変動量ΔＰｓ２量が所定の変動基準値ΔＰｖ１未満である場合には（ステップＳＴ４のＮｏ）、出力周波数あるいは流量の増加に応じて目標値を変動する変動目標圧力値Ｐｄｖを目標圧力値として、吐出圧力をフィードバック制御する（ステップＳＴ５）。 Then, when the fluctuation amount ΔPs2 amount of the second suction pressure is less than the predetermined fluctuation reference value ΔPv1 (No in step ST4), the fluctuation target pressure value Pdv that fluctuates the target value according to the increase of the output frequency or the flow rate. As a target pressure value, the discharge pressure is feedback-controlled (step ST5).
変動目標圧力値Ｐｄｖは、流量センサ１７で検出する流量の値に応じて変化する変動値である。例えば変動目標圧力値Ｐｄｖを算出する式やデータテーブルが記憶装置１８ａに記憶されている。 The fluctuation target pressure value Pdv is a fluctuation value that changes according to the value of the flow detected by the flow sensor 17. For example, a formula for calculating the fluctuation target pressure value Pdv and a data table are stored in the storage device 18a.
ステップＳＴ５として、具体的には、制御部１８ｂは、図６に示すように、停止流量から定格流量までの流量域において、出力周波数あるいは流量の増加に伴い、目標圧力を変化させ、推定末端圧一定制御の目標圧力曲線Ｌ１上の目標圧力に基づいてポンプの出力を制御する。 As step ST5, specifically, as shown in FIG. 6, the control unit 18b changes the target pressure in accordance with the increase of the output frequency or the flow rate in the flow rate range from the stop flow rate to the rated flow rate, and estimates the estimated end pressure. The pump output is controlled based on the target pressure on the target pressure curve L1 of constant control.
一方、第２吸込圧力Ｐｓ２の変動量ΔＰｓ２が所定の変動基準値ΔＰｖ１以上となった場合には（ステップＳＴ４のＹｅｓ）所定時間ｔ１は目標圧力を変動させないように、目標圧力を固定して、ポンプの運転制御を行う（ステップＳＴ６）。すなわち、一定時間ｔ１が経過するまで（ステップＳＴ７）、目標圧を固定し、ステップＳＴ４に戻る。すなわち、図６のグラフに示すように、変動値が一定値以上となった場合には、目標圧力を固定する。その後、一定時間ｔ１が経過した後に、再び目標圧力曲線Ｌ１上の目標圧力に従って推定末端圧一定制御を行う。ｔ１は例えば１０秒程度に設定される。 On the other hand, when the fluctuation amount ΔPs2 of the second suction pressure Ps2 is equal to or larger than the predetermined fluctuation reference value ΔPv1 (Yes in step ST4), the target pressure is fixed so as not to fluctuate the target pressure for a predetermined time t1. Pump operation control is performed (step ST6). That is, the target pressure is fixed until the predetermined time t1 elapses (step ST7), and the process returns to step ST4. That is, as shown in the graph of FIG. 6, when the fluctuation value becomes a certain value or more, the target pressure is fixed. Thereafter, after a predetermined time t1, the estimated terminal pressure constant control is performed again according to the target pressure on the target pressure curve L1. For example, t1 is set to about 10 seconds.
これにより吸込圧力が変動しても、目標圧力は変化しないため、推定末端圧一定制御の目標圧力曲線Ｌ１上で、安定して運転を行うことが可能となる。 As a result, even if the suction pressure varies, the target pressure does not change. Therefore, it is possible to stably operate on the target pressure curve L1 of the estimated terminal pressure constant control.
またステップＳＴ８として、制御部１８ｂは、ポンプの運転中に検出した第１吸込圧力Ｐｓ１が、予め設定された目標圧力と同一の値である第１基準値Ｐｔ１以上であるか、及び、検出した第２吸込圧力Ｐｓ２が始動圧力と同一の値である第２基準値Ｐｔ２以上であるかを判定する。例えばＰｔ１やＰｔ２は、予め定められ、記憶装置１８ａに記憶されている。例えば、始動圧力と同一の値である第２基準値Ｐｔ２は目標圧力と同一の値である第１基準値Ｐｔ１よりも低く設定された値である。そして、第１吸込圧力Ｐｓ１が第１基準値Ｐｔ１以上であり、かつポンプ吸込圧力である第２吸込圧力Ｐｓ２が第２基準値Ｐｔ２以上である状態が、一定時間ｔ２以上継続した場合に（ステップＳＴ８のＹｅｓ）、ポンプを停止する（ステップＳＴ９）。一定時間ｔ２は例えば３秒程度に設定されている。 In step ST8, the control unit 18b detects whether or not the first suction pressure Ps1 detected during the operation of the pump is equal to or higher than the first reference value Pt1 that is the same value as the preset target pressure. It is determined whether the second suction pressure Ps2 is equal to or higher than a second reference value Pt2, which is the same value as the starting pressure. For example, Pt1 and Pt2 are determined in advance and stored in the storage device 18a. For example, the second reference value Pt2 that is the same value as the starting pressure is a value that is set lower than the first reference value Pt1 that is the same value as the target pressure. Then, when the state in which the first suction pressure Ps1 is equal to or higher than the first reference value Pt1 and the second suction pressure Ps2 that is the pump suction pressure is equal to or higher than the second reference value Pt2 continues for a predetermined time t2 (step) (Yes in ST8), the pump is stopped (step ST9). The fixed time t2 is set to about 3 seconds, for example.
さらに、ステップＳＴ１０として、制御部１８ｂはポンプ２３の停止中に、第１吸込圧力Ｐｓ１が第１基準値Ｐｔ１未満であるか、または、ポンプ吸込圧力である第２吸込圧力Ｐｓ２が第２基準値Ｐｔ２未満であるかを判定する（ステップＳＴ１０）。
そして、第１吸込圧力Ｐｓ１が第１基準値Ｐｔ１未満であるか、または、ポンプ吸込圧力である第２吸込圧力Ｐｓ２が第２基準値Ｐｔ２未満となる場合には（ステップＳＴ１０のＹｅｓ）、ポンプ２３の運転を再開する（ステップＳＴ１１）。
Further, as step ST10, the controller 18b determines that the first suction pressure Ps1 is less than the first reference value Pt1 or the second suction pressure Ps2 that is the pump suction pressure is the second reference value while the pump 23 is stopped. It is determined whether it is less than Pt2 (step ST10).
When the first suction pressure Ps1 is less than the first reference value Pt1 or the second suction pressure Ps2 that is the pump suction pressure is less than the second reference value Pt2 (Yes in step ST10), the pump 23 is resumed (step ST11).
さらに制御部１８ｂは、ステップＳＴ１２として、ポンプ２３の運転中に、第１吸込圧力Ｐｓ１が第３基準値Ｐｔ３以下であるかと、第２吸込圧力Ｐｓ２が第４基準値Ｐｔ４以下であるかを判定する。そして、第１吸込圧力Ｐｓ１が第３基準値Ｐｔ３以下、または第２吸込圧力Ｐｓ２が第４基準値Ｐｔ４以下である場合に（ステップＳＴ１２のＹｅｓ）、ポンプ２３を停止する（ステップＳＴ１３）。 Further, the control unit 18b determines whether the first suction pressure Ps1 is equal to or lower than the third reference value Pt3 and the second suction pressure Ps2 is equal to or lower than the fourth reference value Pt4 during operation of the pump 23 as Step ST12. To do. If the first suction pressure Ps1 is equal to or lower than the third reference value Pt3 or the second suction pressure Ps2 is equal to or lower than the fourth reference value Pt4 (Yes in step ST12), the pump 23 is stopped (step ST13).
第３基準値は、０．０７ＭＰａとなるように設定された値であり記憶装置１８ａに記憶された閾値である。第４基準値は０．０１ＭＰａとなるように設定された値であり、記憶装置１８ａに記憶された閾値である。 The third reference value is a value set to be 0.07 MPa and is a threshold value stored in the storage device 18a. The fourth reference value is a value set to be 0.01 MPa, and is a threshold value stored in the storage device 18a.
さらに、ステップＳＴ１４として、制御部１８ｂはポンプ２３の停止中に、第１吸込圧力Ｐｓ１が第５基準値Ｐｔ５以上となるか否かを判定する（ステップＳＴ１４）。第５基準値Ｐｔ５は例えば第３基準値Ｐｔ３よりも高い０．１ＭＰａとなるように設定され、記憶装置１８ａに記憶された閾値である。 Furthermore, as step ST14, the control unit 18b determines whether or not the first suction pressure Ps1 is equal to or higher than the fifth reference value Pt5 while the pump 23 is stopped (step ST14). For example, the fifth reference value Pt5 is a threshold value set to be 0.1 MPa higher than the third reference value Pt3 and stored in the storage device 18a.
そして、第１吸込圧力Ｐｓ１が第５基準値Ｐｔ５以上となる場合には（ステップＳＴ１４のＹｅｓ）、ポンプ２３の運転を再開する（ステップＳＴ１５）。 When the first suction pressure Ps1 is equal to or higher than the fifth reference value Pt5 (Yes in step ST14), the operation of the pump 23 is restarted (step ST15).
また、制御部１８ｂは、ポンプ２３の停止中に検出した第２吸込圧力Ｐｓ２が吐出圧力Ｐｄと略同じ値である状態が一定時間ｔ３継続するか否か（ステップＳＴ１６）を判定する。具体的には制御部１８ｂはステップＳＴ１３において、第２吸込圧力Ｐｓ２と吐出圧力Ｐｄとの差圧を検出し、差圧が予め設定された基準差圧Ｐｔ６以下であるか否かを判定する。基準差圧Ｐｔ６は例えば０．０５ＭＰａ程度、ｔ３は例えば１０秒程度に設定される。第２吸込圧力Ｐｓ２と吐出圧力Ｐｄとの差圧が基準差圧Ｐｔ６以下であり、第２吸込圧力Ｐｓ２が吐出圧力Ｐｄと同等の範囲内となった状態が一定時間ｔ３継続した場合には（ステップＳＴ１６のＹｅｓ）、停止側のポンプ２３の逆止弁５２の故障とし、警報を表示・送出する報知処理を行う（ステップＳＴ１８）。 Further, the controller 18b determines whether or not the state in which the second suction pressure Ps2 detected while the pump 23 is stopped is substantially the same value as the discharge pressure Pd continues for a predetermined time t3 (step ST16). Specifically, in step ST13, the control unit 18b detects a differential pressure between the second suction pressure Ps2 and the discharge pressure Pd, and determines whether or not the differential pressure is equal to or less than a preset reference differential pressure Pt6. The reference differential pressure Pt6 is set to about 0.05 MPa, for example, and t3 is set to about 10 seconds, for example. When the differential pressure between the second suction pressure Ps2 and the discharge pressure Pd is equal to or lower than the reference differential pressure Pt6 and the second suction pressure Ps2 is within the same range as the discharge pressure Pd, continues for a certain time t3 ( If the check valve 52 of the stop-side pump 23 is faulty, a notification process for displaying and sending out an alarm is performed (step ST18).
ステップＳＴ１６において、ポンプの停止中に検出した第２吸込圧力Ｐｓ２が吐出圧力Ｐｄと略同じ値である状態が一定時間ｔ３継続しない（ステップＳＴ１６のＮｏ）場合、制御部１８ｂは、ポンプ停止中に、増圧給水装置１の吸込圧力Ｐｓ１と第２吸込圧力Ｐｓ２とを比較し（ステップＳＴ１７）、その差圧が、あらかじめ定められた設定差圧△Ｐｔ７、例えば、１ｍ以下になった場合（ステップＳＴ１７のＹｅｓ）、逆流防止装置１３の第１の逆止弁１３ａ及び第２の逆止弁１３ｂに、同時に漏れが発生したと判断して警報を表示・送出する報知処理を行う（ステップＳＴ１８）。ステップＳＴ１８の報知処理として、制御部１８ｂは、警報として、例えば電装部１８に設けられた報知ランプ１８ｄを点灯、あるいは点滅させる。この他、例えば電装部１８や外部に設けられるモニタに警告を表示し、あるいは警報音を発生させてもよい。 In step ST16, when the state in which the second suction pressure Ps2 detected while the pump is stopped is substantially the same value as the discharge pressure Pd does not continue for a certain time t3 (No in step ST16), the control unit 18b The suction pressure Ps1 and the second suction pressure Ps2 of the pressure-increasing water supply apparatus 1 are compared (step ST17), and when the differential pressure becomes a preset differential pressure ΔPt7, for example, 1 m or less (step) (Yes in ST17), the first check valve 13a and the second check valve 13b of the backflow prevention device 13 are judged to have leaked at the same time, and a notification process for displaying and sending out an alarm is performed (step ST18). . As the notification process in step ST18, the control unit 18b turns on or blinks the notification lamp 18d provided in the electrical unit 18, for example, as an alarm. In addition, for example, a warning may be displayed on the electrical unit 18 or a monitor provided outside, or an alarm sound may be generated.
制御部１８ｂはこれらの処理をポンプの運転終了指示があるまで繰り返し、運転終了の指示があれば運転を終了する（ステップＳＴ１９）。 The control unit 18b repeats these processes until there is an instruction to end the operation of the pump, and ends the operation if there is an instruction to end the operation (step ST19).
以上の様に構成された増圧給水装置１によれば、ポンプ２３の運転中に、増圧給水装置１の吸込圧力Ｐｓ１が目標圧力以上、かつ、ポンプ吸込圧力である第２吸込圧力Ｐｓ２が目標圧力より低く設定された始動圧力以上の状態が、一定時間の間継続した場合、流量センサ１７により検出された流量が停止流量を超えていても、ポンプ２３を停止するようにしている。すなわち、直接、ポンプ吸込圧力と始動圧力（目標圧力一定値）を比較している。このため、様々な口径の減圧弁式の逆流防止装置・ストレーナなどの圧力損失が加算された合計値が、給水量の変動に伴い複雑に変動したとしても、これに影響されることなく、安定してポンプ２３を自動停止することが可能となる。従って、ポンプ２３の停止後に、アキュムレータ４１に蓄えられた水が流出して、吐出し圧力が始動圧力まで低下することはなく、ポンプ２３が再始動するハンチング現象を防止できる。 According to the pressure increasing water supply apparatus 1 configured as described above, during the operation of the pump 23, the suction pressure Ps1 of the pressure increasing water supply apparatus 1 is equal to or higher than the target pressure, and the second suction pressure Ps2 that is the pump suction pressure is When a state equal to or higher than the start pressure set lower than the target pressure continues for a certain time, the pump 23 is stopped even if the flow rate detected by the flow rate sensor 17 exceeds the stop flow rate. That is, the pump suction pressure and the starting pressure (target pressure constant value) are directly compared. For this reason, even if the total value of the pressure loss of pressure reducing valve type backflow prevention devices and strainers with various caliber is complicated due to fluctuations in the amount of water supply, it is stable without being affected by this. Thus, the pump 23 can be automatically stopped. Therefore, after the pump 23 is stopped, the water stored in the accumulator 41 does not flow out and the discharge pressure does not decrease to the starting pressure, and the hunting phenomenon in which the pump 23 is restarted can be prevented.
また、上記実施形態にかかる増圧給水装置１においては、ポンプ２３の運転中に、増圧給水装置１の吸込圧力Ｐｓ１があらかじめ定めた第１基準値Ｐｔ１＝０．０７ＭＰａ以下、または、ポンプ２３の吸込圧力Ｐｓ２が、あらかじめ定めた第２基準値Ｐｔ２＝０．０１ＭＰａ以下になった場合、ポンプ２３を自動停止し、ポンプ２３の停止中に、増圧給水装置１の吸込圧力Ｐｓ１が、Ｐ１より高く定めた第３基準値Ｐｔ３＝０．１ＭＰａ以上に回復した場合、ポンプ２３を運転可能としている。これにより、増圧給水装置１の吸込圧力Ｐｓ１が０．０７ＭＰａ超であっても、ポンプ２３の吸込圧力が正圧０．０１ＭＰａ以下に低下すれば、ポンプ２３が自動停止する。したがって、ポンプ２３の吸込圧力が負圧になりキャビテーションが発生して揚水不能に陥ることを、防止できる。 Moreover, in the pressure increase water supply apparatus 1 concerning the said embodiment, during the driving | operation of the pump 23, the suction pressure Ps1 of the pressure increase water supply apparatus 1 is predetermined 1st reference value Pt1 = 0.07 MPa or less, or the pump 23 The suction pressure Ps2 of the pressure increasing water supply apparatus 1 is reduced to P1 when the pump 23 is automatically stopped when the second reference value Pt2 = 0.01 MPa or less is reached. When the third reference value Pt3, which is set higher, is recovered to 0.1 MPa or more, the pump 23 can be operated. Thereby, even if the suction pressure Ps1 of the pressure increasing water supply apparatus 1 is more than 0.07 MPa, the pump 23 is automatically stopped if the suction pressure of the pump 23 is reduced to a positive pressure of 0.01 MPa or less. Therefore, it is possible to prevent the suction pressure of the pump 23 from becoming negative and causing cavitation to cause pumping failure.
また、一方のポンプ２３の運転中に、第２吸込圧力Ｐｓ２が、一定時間ｔ２の間、吐出し圧力Ｐｄよりあらかじめ定められた基準差圧Ｐｔ６（例：５ｍ）以内になった場合、他方の停止側のポンプ２３の、吐出し側の逆止弁５２の故障とし、警報を表示・送出するようにしている。これにより、停止しているポンプ２３の逆止弁５２が故障した場合の逆流による無駄な電力消費を、警告・表示等により把握することができる。さらに、故障した逆止弁５２が識別されているため、故障修理時にすべての逆止弁を点検する必要がなく、修理作業の手間を軽減できる。 Further, when the second suction pressure Ps2 falls within a predetermined reference differential pressure Pt6 (eg, 5 m) from the discharge pressure Pd for a certain time t2 during the operation of one pump 23, the other A failure of the discharge side check valve 52 of the stop side pump 23 is regarded as a failure, and an alarm is displayed and transmitted. Thereby, useless power consumption due to the backflow when the check valve 52 of the stopped pump 23 fails can be grasped by a warning / display or the like. Furthermore, since the failed check valve 52 is identified, it is not necessary to check all the check valves at the time of failure repair, and the labor of repair work can be reduced.
また、ポンプ２３の停止中に、増圧給水装置１の吸込圧力Ｐｓ１とポンプ吸込圧力Ｐｓ２との差圧が、あらかじめ定められた設定差圧△Ｐｔ７、例えば、１ｍ以下になった場合、逆流防止装置１３の第１の逆止弁１３ａ及び第２の逆止弁１３ｂに、同時に漏れが発生したと判断して警報を表示・送出する報知処理を行う。 Further, when the differential pressure between the suction pressure Ps1 and the pump suction pressure Ps2 of the pressure-increasing water supply device 1 becomes a predetermined differential pressure ΔPt7, for example, 1 m or less while the pump 23 is stopped, backflow prevention is performed. It is determined that a leak has occurred in the first check valve 13a and the second check valve 13b of the device 13 at the same time, and a notification process for displaying and sending an alarm is performed.
また、上記実施形態においては、定格流量時における第１の目標圧力Ｐｄ１と、停止流量時における第２の目標圧力Ｐｄ２を設定し、停止流量から定格流量までの流量域において、出力周波数及び流量の増加に伴い高くなるよう定めた目標圧力に対応して、出力周波数を制御する推定末端末圧一定制御方式とした。そして、第２吸込圧力Ｐｓ２が、一定値△Ｐｖ１以上増減した場合、目標圧力の変更を一定時間禁止するようにしている。これにより、第２吸込圧力Ｐｓ２が変動しても、目標圧力の安定性が保たれる。したがって、第２吸込圧力Ｐｓ２の急激な変動により、給水流量Ｑが変化していないにもかかわらず、図６の実線矢印に示されるような目標圧力の過度低下や、目標圧力の不必要な上昇による無駄な電力消費を、防止することが可能となる。 In the above embodiment, the first target pressure Pd1 at the rated flow rate and the second target pressure Pd2 at the stop flow rate are set, and the output frequency and flow rate are set in the flow rate range from the stop flow rate to the rated flow rate. An estimated terminal pressure constant control method for controlling the output frequency corresponding to the target pressure determined to increase with increasing is adopted. When the second suction pressure Ps2 increases or decreases by a certain value ΔPv1 or more, the change of the target pressure is prohibited for a certain time. Thereby, even if 2nd suction pressure Ps2 fluctuates, stability of target pressure is maintained. Therefore, the target pressure is excessively decreased or the target pressure is unnecessarily increased as shown by the solid line arrow in FIG. 6 even though the feed water flow rate Q does not change due to the rapid fluctuation of the second suction pressure Ps2. It is possible to prevent wasteful power consumption due to.
なお、従来の制御方法の例として、ハンチング現象を防止するために、逆流防止装置と連結管吐出側逆止弁などの圧力損失を考慮したマージンを設定する手法が知られている。この方法では、例えば吸込み圧力が目標圧力Ｐ＋マージンα（ｍ）以上に上昇した場合にポンプを自動停止する。また、元圧と吐出圧との間の抵抗損失を一種類設定し、あるいは目標圧力に加算する抵抗損失が給水量に比例すると見なした関数とすることも考えられる。しかしながら、圧力損失は口径により変化するとともに、給水量の増大に伴い複雑な曲線を描いて増大しており、最適なマージンαを設定することは困難である。例えば最大圧力損失を１０ｍと仮定して吸込圧力Ｐｓ１が目標圧力Ｐ＋１０ｍ以上に上昇した場合に停止すれば、上記のハンチング現象を防止できるが、高配水圧時停止が可能であるのにポンプを停止できず、無駄な電力を消費することになる。 As an example of a conventional control method, there is known a method of setting a margin in consideration of pressure loss such as a backflow prevention device and a connecting pipe discharge side check valve in order to prevent a hunting phenomenon. In this method, for example, when the suction pressure rises above the target pressure P + margin α (m), the pump is automatically stopped. It is also conceivable that one type of resistance loss between the source pressure and the discharge pressure is set, or that the resistance loss added to the target pressure is assumed to be proportional to the amount of water supply. However, the pressure loss changes depending on the diameter, and increases in a complicated curve as the amount of water supply increases, and it is difficult to set the optimum margin α. For example, assuming that the maximum pressure loss is 10 m and stopping when the suction pressure Ps1 rises to the target pressure P + 10 m or more, the above hunting phenomenon can be prevented, but the pump can be stopped even when stopping at a high water distribution pressure. Therefore, useless power is consumed.
また、従来の制御方法の例として、ポンプの運転中に給水装置の吸込圧力が例えば第１基準値としての設定圧力０．０７ＭＰａ以下になった場合にポンプを自動停止し、給水装置の吸込圧力が第２基準値以上に回復した場合にポンプの運転復帰を可能とする機能も知られている。しかしながら、増圧給水装置の吸込圧力が０．０７ＭＰａを僅かに超える状態で給水量が増大した場合、閉止弁とストレーナと減圧弁式逆流防止装置の圧力損失に、吸込側連結等の圧力損失を加えた値が７ｍを超えると、ポンプ吸込圧力が負圧になり、キャビテーションにより水中に溶存していた空気が気泡となって発生する。この場合、インペラの羽根間の流路に気泡が滞留し、長時間運転すると流路を閉塞し、揚水不能となる場合がある。さらに、ポンプ吐出し側に備えられた逆止弁がポンプ停止中に故障した場合、運転側のポンプの負圧力水が停止しているポンプの吐出し側から吸込み管へ逆流し、吸込側の連結管から運転側のポンプの吸込口へ流入するといった循環流が生じ、無駄な電力消費をすることになる。 In addition, as an example of a conventional control method, when the suction pressure of the water supply device becomes, for example, 0.07 MPa or less as the first reference value during the operation of the pump, the pump is automatically stopped, and the suction pressure of the water supply device There is also known a function that makes it possible to return the pump to the operation when is recovered to the second reference value or more. However, if the amount of water supply increases while the suction pressure of the pressure increase water supply device slightly exceeds 0.07 MPa, the pressure loss of the suction side connection etc. is added to the pressure loss of the shutoff valve, strainer and pressure reducing valve type backflow prevention device. When the added value exceeds 7 m, the pump suction pressure becomes negative, and air dissolved in water by cavitation is generated as bubbles. In this case, bubbles may remain in the flow path between impeller blades, and the flow path may be blocked and pumping may not be possible when operated for a long time. Furthermore, if the check valve provided on the pump discharge side breaks down while the pump is stopped, the negative pressure water of the pump on the operation side flows back from the discharge side of the pump to the suction pipe, and the suction side A circulating flow that flows from the connecting pipe to the suction port of the pump on the operation side is generated, resulting in wasteful power consumption.
また、従来の制御方法の例として、増圧給水装置において推定末端圧力一定制御を行う場合には、吸込圧力の変動により、目標圧力が低下する場合がある。すなわち、増圧給水装置において最高出力周波数時の目標圧力を第１の目標圧力、停止流量時の目標圧力を第２の目標圧力とするとともに、停止流量時の出力周波数を検出して出力周波数の下限と上限の範囲を定め、ポンプへの出力周波数ｆ＝ポンプ回転数を変数とした関数を演算して目標圧力を決定する場合、例えば、吸込側圧力が増加することより、吐出し圧力が目標圧力より上昇し、出力周波数を低下して目標圧力まで下げようとするため、給水流量が変化していないにもかかわらず吸込側圧力の変動により、目標圧力の低下を引き起こすことになる。一方、吸込側圧力が減少した場合は、吐出し圧力が目標圧力より低下し、出力周波数を増加して目標圧力まで上げようとするために、給水流量が変化していないにもかかわらず、目標圧力が上昇して無駄な電力を消費してしまうというという不具合があった。この矛盾を解消するため、ＰＩＤ制御における微分要素をなくすか、または積分要素の遅れ時間を長くする、もしくは、比例領域を小さく設定する、などの方策が考えられる。ここで、比例領域は目標圧力差、すなわち第１目標圧力−第２目標圧力、である。しかし、微分要素なしに積分要素の遅れ時間を長くすれば、トイレのフラッシュバルブなどによる急激な給水量の増加に追従することが困難になる。また、比例領域を小さくすれば、吐出し圧力一定制御方式に対する推定末端圧一定制御方式の優位性である、配管抵抗に応じた不要な発生圧力を低減することによる省エネルギー効果が、消失してしまう。 Moreover, as an example of the conventional control method, when the estimated terminal pressure constant control is performed in the pressure-increasing water supply apparatus, the target pressure may decrease due to fluctuations in the suction pressure. That is, in the pressure increasing water supply apparatus, the target pressure at the maximum output frequency is set as the first target pressure, the target pressure at the stop flow rate is set as the second target pressure, and the output frequency at the stop flow rate is detected to detect the output frequency. When the target pressure is determined by calculating a function with the output frequency f = pump rotation speed as a variable, the lower limit and the upper limit range are determined, for example, the suction pressure is increased by increasing the suction side pressure. Since it rises above the pressure and attempts to lower the output frequency to the target pressure, the target pressure is reduced due to fluctuations in the suction side pressure even though the feed water flow rate has not changed. On the other hand, when the suction side pressure decreases, the discharge pressure falls below the target pressure and the output frequency is increased to increase to the target pressure. There was a problem that wasteful power was consumed due to an increase in pressure. In order to eliminate this contradiction, measures such as eliminating the differential element in the PID control, increasing the delay time of the integral element, or setting the proportional region small can be considered. Here, the proportional region is the target pressure difference, that is, the first target pressure minus the second target pressure. However, if the delay time of the integral element is increased without the differential element, it becomes difficult to follow a rapid increase in the amount of water supplied by the flush valve of the toilet. In addition, if the proportional area is reduced, the energy saving effect by reducing the unnecessary generated pressure according to the pipe resistance, which is the superiority of the estimated terminal pressure constant control method over the discharge pressure constant control method, disappears. .
また、従来の制御方法の一例として、増圧給水装置に、流量に比例した出力特性を有する流量検出部を設け、給水装置の運転流量を計測して、推定末端圧一定制御を行う場合もある。この場合、吸込圧力の時間あたりの変動幅が小さい場合は、ポンプへの出力周波数を変数として、目標圧力を決定する方式に比べ、安定した自動制御が可能である。すなわち、例えば、吸込圧力が上昇し、吐出し圧力が増加すると、制御により吐出圧力を目標圧力まで低減し、給水流量は変動しない、とする制御が可能である。または、吸込圧力が低下し、吐出し圧力が低下すると、制御により吐出し圧力を目標圧力まで増加することで、給水流量は変動しない、とする制御が可能である。一方、吸込圧力の時間あたりの変動幅が大きい場合は、不具合を生じる場合がある。例えば、急激な吸込圧力の上昇により、吐出し圧力が増加し、吐出し圧力を目標圧力まで低減することで、圧力低減が追いつかず給水流量が増加し、目標圧力が増加し、目標圧力が不必要に高止まりしてしまう、という不具合を生じることがある。あるいは、急激な吸込圧力の低下により吐出し圧力が低下し、吐出し圧力を目標圧力まで増加することで、圧力増加が追いつかず給水流量が低下し、目標圧力が低下し、目標圧力の不足により末端圧力が低下する、という不具合を生じることがある。したがって、出力周波数の加減速時間を可変としたり、吐出し圧力と流量のサンプリング間隔を調整するなどの対応では、安定した自動制御が困難であった。 In addition, as an example of a conventional control method, there is a case where a flow rate detection unit having an output characteristic proportional to the flow rate is provided in the pressure increasing water supply device, and the operation flow rate of the water supply device is measured to perform the estimated terminal pressure constant control. . In this case, when the fluctuation range of the suction pressure per time is small, stable automatic control is possible as compared with a method of determining the target pressure using the output frequency to the pump as a variable. That is, for example, when the suction pressure increases and the discharge pressure increases, it is possible to control the discharge pressure to be reduced to the target pressure by the control so that the feed water flow rate does not fluctuate. Alternatively, when the suction pressure decreases and the discharge pressure decreases, it is possible to control that the supply water flow rate does not fluctuate by increasing the discharge pressure to the target pressure by control. On the other hand, when the fluctuation range per hour of the suction pressure is large, a problem may occur. For example, when the suction pressure increases suddenly, the discharge pressure increases, and by reducing the discharge pressure to the target pressure, the pressure reduction cannot catch up and the water supply flow rate increases, the target pressure increases, and the target pressure is There may be a problem that it stays high enough. Alternatively, the discharge pressure decreases due to a sudden drop in the suction pressure, and the discharge pressure increases to the target pressure, so that the increase in pressure cannot catch up, the water supply flow rate decreases, the target pressure decreases, and the target pressure is insufficient. There may be a problem that the terminal pressure is lowered. Therefore, it has been difficult to perform stable automatic control in response to making the acceleration / deceleration time of the output frequency variable or adjusting the sampling interval of the discharge pressure and flow rate.
上記本実施形態にかかる増圧給水装置１によれば、これらの従来の制御方法の例における不具合を回避し、無駄な電力を消費することなく、最適な設定が可能であり、効果的にハンチング現象を防止できるとともに、安定した自動制御が可能となる。 According to the pressure-increasing water supply apparatus 1 according to the present embodiment, it is possible to avoid problems in these conventional control method examples, and to perform optimum setting without consuming wasteful power and effectively hunting. Phenomenon can be prevented and stable automatic control becomes possible.
なお、本発明は上記各実施形態そのままに限定されるものではなく、実施段階ではその
要旨を逸脱しない範囲で構成要素を変形して具体化できる。さらに、上記実施形態の構成要件のうち一部を省略しても本発明を実現可能である。
Note that the present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the components without departing from the scope of the invention in the implementation stage. Furthermore, the present invention can be realized even if some of the constituent features of the above-described embodiment are omitted.
１…増圧給水装置、１１…ポンプ装置、１２…配管、１２ａ…吸込口、１２ｂ…吐出口、１３…逆流防止装置、１３ａ…第１の逆止弁、１３ｂ…第２の逆止弁、１３ｃ…リテーナ、１４…第１圧力センサ、１５…第２圧力センサ、１６…第３圧力センサ、１７…流量センサ、１８…電装部、１８ａ…記憶装置、１８ｂ…制御部、１８ｃ…インバータ、１８ｄ…報知ランプ、１９…ポンプカバー、２１…モータ、２２…インペラ、２３…ポンプ、２３ａ…ポンプ吸込口、２３ｂ…ポンプ吐出口、３１…吸込配管、３２…吸込連結管、３３…ボール弁、３４…個別吐出管、３５…吐出連結管、３６…バイパス連結管、３７…ストレーナ、４１…アキュムレータ、５１、５２…逆止弁。 DESCRIPTION OF SYMBOLS 1 ... Booster water supply apparatus, 11 ... Pump apparatus, 12 ... Piping, 12a ... Suction port, 12b ... Discharge port, 13 ... Backflow prevention device, 13a ... 1st check valve, 13b ... 2nd check valve, 13c ... Retainer, 14 ... First pressure sensor, 15 ... Second pressure sensor, 16 ... Third pressure sensor, 17 ... Flow rate sensor, 18 ... Electrical equipment, 18a ... Storage device, 18b ... Control unit, 18c ... Inverter, 18d Reference lamp, 19 ... Pump cover, 21 ... Motor, 22 ... Impeller, 23 ... Pump, 23a ... Pump suction port, 23b ... Pump discharge port, 31 ... Suction pipe, 32 ... Suction connection pipe, 33 ... Ball valve, 34 ... individual discharge pipes, 35 ... discharge connection pipes, 36 ... bypass connection pipes, 37 ... strainers, 41 ... accumulators, 51, 52 ... check valves.
本発明の一形態にかかる増圧給水装置は、ポンプと、前記ポンプの一次側に配された逆流防止装置と、前記逆流防止装置と前記ポンプの間に配され、前記逆流防止装置の二次側であって前記ポンプの吸込側の吸込圧力を検出する吸込圧力検出部と、前記ポンプの二次側に配され、前記ポンプの吐出側の吐出圧力を検出する吐出圧力検出部と、前記吐出圧力に基づいて前記ポンプの出力を制御するとともに、前記ポンプの運転中に前記吸込圧力検出部にて検出された吸込圧力に基づいて前記ポンプの動作を制御する制御部と、を備える。 Increasing pressure feed water device according to an embodiment of the present invention, a pump, a backflow prevention device disposed on the primary side of the pump, disposed between the said backflow prevention device pump, the secondary of the backflow prevention device a suction pressure detector for detecting the suction pressure of the suction side of the pump a side, arranged on the secondary side of the pump, the discharge pressure detector for detecting a delivery pressure of the discharge side of the pump, the discharge A controller that controls the output of the pump based on the pressure and that controls the operation of the pump based on the suction pressure detected by the suction pressure detector during operation of the pump.
また、上記実施形態にかかる増圧給水装置１においては、ポンプ２３の運転中に、増圧給水装置１の吸込圧力Ｐｓ１があらかじめ定めた基準値０．０７ＭＰａ以下、または、ポンプ２３の吸込圧力Ｐｓ２が、あらかじめ定めた基準値０．０１ＭＰａ以下になった場合、ポンプ２３を自動停止し、ポンプ２３の停止中に、増圧給水装置１の吸込圧力Ｐｓ１が、前記基準値０．０７ＭＰａより高く定めた基準値０．１ＭＰａ以上に回復した場合、ポンプ２３を運転可能としている。これにより、増圧給水装置１の吸込圧力Ｐｓ１が０．０７ＭＰａ超であっても、ポンプ２３の吸込圧力が正圧０．０１ＭＰａ以下に低下すれば、ポンプ２３が自動停止する。したがって、ポンプ２３の吸込圧力が負圧になりキャビテーションが発生して揚水不能に陥ることを、防止できる。 Moreover, in the pressure increase water supply apparatus 1 concerning the said embodiment, the suction pressure Ps1 of the pressure increase water supply apparatus 1 is below the predetermined reference value 0.07 MPa or the suction pressure Ps2 of the pump 23 during the operation of the pump 23. However, when the predetermined reference value is 0.01 MPa or less , the pump 23 is automatically stopped, and the suction pressure Ps1 of the pressure increasing water supply apparatus 1 is set higher than the reference value 0.07 MPa while the pump 23 is stopped. When the reference value is recovered to 0.1 MPa or more, the pump 23 can be operated. Thereby, even if the suction pressure Ps1 of the pressure increasing water supply apparatus 1 is more than 0.07 MPa, the pump 23 is automatically stopped if the suction pressure of the pump 23 is reduced to a positive pressure of 0.01 MPa or less. Therefore, it is possible to prevent the suction pressure of the pump 23 from becoming negative and causing cavitation to cause pumping failure.
なお、本発明は上記各実施形態そのままに限定されるものではなく、実施段階ではその要旨を逸脱しない範囲で構成要素を変形して具体化できる。さらに、上記実施形態の構成要件のうち一部を省略しても本発明を実現可能である。
以下に、本願出願の当初の特許請求の範囲に記載された発明を付記する。
［１］
ポンプと、
前記ポンプの一次側に配された逆流防止装置と、
前記逆流防止装置の一次側に配され、前記ポンプの吸込側の第１吸込圧力を検出する第１吸込圧力検出部と、
前記逆流防止装置と前記ポンプの間に配され、前記ポンプの吸込側の第２吸込圧力を検出する第２吸込圧力検出部と、
前記ポンプの二次側に配され、前記ポンプの吐出側の吐出圧力を検出する吐出圧力検出部と、
前記吐出圧力に基づいて前記ポンプの出力を制御するとともに、前記ポンプの運転中に前記第１吸込圧力が目標圧力である第１基準値以上であって、かつ前記第２吸込圧力が前記第１基準値より低く設定された始動圧力である第２基準値以上となる状態が所定時間継続した場合に、前記ポンプを停止するとともに、
前記ポンプの停止中に第１吸込圧力が第１基準値未満もしくは第２吸込圧力が第２基準値未満となった場合、前記ポンプを再始動する制御部と、を備える増圧給水装置。
［２］
前記制御部は、前記ポンプの運転中に、第１吸込圧力が第３基準値以下、または第２吸込圧力が第４基準値以下になった場合に、ポンプを停止するとともに、前記ポンプの停止中に、前記第１吸込圧力が前記第３基準値よりも高い第５基準値以上となった場合に、前記ポンプを再始動する、［１］記載の増圧給水装置。
［３］
前記制御部は、前記ポンプの運転中に前記第２吸込圧力と前記吐出圧力との差が所定値以内である場合に、報知処理を行う、［１］または［２］記載の増圧給水装置。
［４］
前記制御部は、前記ポンプの運転中に前記第１吸込圧力と前記第２吸込圧力との差が所定値以内である場合に、報知処理を行う、［１］記載の増圧給水装置。
［５］
ポンプと、
前記ポンプの一次側に配された逆流防止装置と、
前記逆流防止装置の一次側に配され、前記ポンプの吸込側の第１吸込圧力を検出する第１吸込圧力検出部と、
前記逆流防止装置と前記ポンプの間に配され、前記ポンプの吸込側の第２吸込圧力を検出する第２吸込圧力検出部と、
前記ポンプの二次側に配され、前記ポンプの吐出側の吐出圧力を検出する吐出圧力検出部と、
推定末端圧一定制御方式であって、停止流量から定格流量までの流量域において、停止流量時の第１目標吐出圧力から定格流量時の第２目標吐出圧力まで、出力周波数あるいは流量の増加に伴って変動する変動目標吐出圧力に基づいて前記ポンプの出力を制御するとともに、
前記第２吸込圧力の変動量が所定の変動基準値以上となった場合には、所定時間前記変動目標吐出圧力を固定する、制御部と、を備える増圧給水装置。
［６］
前記ポンプを複数備えるとともに、
吸込口から逆流防止装置に至る吸込配管と、前記逆流防止装置の二次側に接続され複数の前記ポンプのポンプ吸込口に至る流路を有する吸込連結管と、前記ポンプのポンプ吐出口に接続される個別吐出流路と、前記吸込連結管に連通するバイパス流路と、給水先に連通する吐出口と、を有する吐出連結管と、を備え、前記ポンプの吐出側に逆止弁を備える、配管と、
前記個別吐出流路に配される流量検出部と、を備える、［１］乃至［５］のいずれか記載の増圧給水装置。
［７］
ポンプの一次側に配された逆流防止装置の一次側の第１吸込圧力と、
前記逆流防止装置と前記ポンプの間の第２吸込圧力と
前記ポンプの二次側の吐出圧力と、を検出し、
前記吐出圧力に基づいて前記ポンプの出力を制御するとともに、前記ポンプの運転中に前記第１吸込圧力が第１基準値以上であって、前記第２吸込圧力が前記第１基準値より低く設定された第２基準値以上である状態が所定時間継続した場合に、前記ポンプを停止する、増圧給水装置の制御方法。
［８］
前記ポンプの運転中に、第１吸込圧力が第３基準値以下、または第２吸込圧力が第４基準値以下になった場合に、ポンプを停止するとともに、前記ポンプの停止中に、前記第１吸込圧力が前記第３基準値よりも高い第５基準値以上となった場合に、前記ポンプを運転する、［７］記載の増圧給水装置の制御方法。
［９］
前記ポンプの運転中に前記第２吸込圧力と前記吐出圧力との差が所定値以内である場合、あるいは、前記ポンプの運転中に前記第１吸込圧力と前記第２吸込圧力との差が所定値以内である場合に、報知処理を行う、［７］または［８］記載の増圧給水装置の制御方法。
［１０］
ポンプの一次側に配された逆流防止装置の一次側の第１吸込圧力と、
前記逆流防止装置と前記ポンプの間の第２吸込圧力と
前記ポンプの二次側の吐出圧力と、を検出し
停止流量から定格流量までの流量域において、停止流量時の第１目標吐出圧力から定格流量時の第２目標吐出圧力まで、出力周波数あるいは流量の増加に伴って変動する目標圧力に基づいて前記ポンプの出力を制御するとともに、
前記第２吸込圧力の変動量が所定の変動基準値以上となった場合には、所定時間、目標圧力を固定する増圧給水装置の制御方法。
Note that the present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the components without departing from the scope of the invention in the implementation stage. Furthermore, the present invention can be realized even if some of the constituent features of the above-described embodiment are omitted.
Hereinafter, the invention described in the scope of claims of the present application will be appended.
[1]
A pump,
A backflow prevention device disposed on the primary side of the pump;
A first suction pressure detector that is disposed on the primary side of the backflow prevention device and detects a first suction pressure on the suction side of the pump;
A second suction pressure detector that is disposed between the backflow prevention device and the pump and detects a second suction pressure on the suction side of the pump;
A discharge pressure detector that is disposed on the secondary side of the pump and detects a discharge pressure on the discharge side of the pump;
The pump output is controlled based on the discharge pressure, the first suction pressure is equal to or higher than a first reference value that is a target pressure during the operation of the pump, and the second suction pressure is the first suction pressure. When the state that is equal to or higher than the second reference value, which is the starting pressure set lower than the reference value, continues for a predetermined time, the pump is stopped,
And a control unit that restarts the pump when the first suction pressure is less than the first reference value or the second suction pressure is less than the second reference value while the pump is stopped.
[2]
The controller stops the pump and stops the pump when the first suction pressure is less than or equal to a third reference value or the second suction pressure is less than or equal to the fourth reference value during operation of the pump. The pressure-increasing water supply apparatus according to [1], wherein the pump is restarted when the first suction pressure becomes equal to or higher than a fifth reference value higher than the third reference value.
[3]
The said control part performs an alerting | reporting process when the difference of the said 2nd suction pressure and the said discharge pressure is less than predetermined value during the driving | operation of the said pump, The pressure increase water supply apparatus of [1] or [2] .
[4]
The pressure-increasing water supply device according to [1], wherein the control unit performs a notification process when a difference between the first suction pressure and the second suction pressure is within a predetermined value during operation of the pump.
[5]
A pump,
A backflow prevention device disposed on the primary side of the pump;
A first suction pressure detector that is disposed on the primary side of the backflow prevention device and detects a first suction pressure on the suction side of the pump;
A second suction pressure detector that is disposed between the backflow prevention device and the pump and detects a second suction pressure on the suction side of the pump;
A discharge pressure detector that is disposed on the secondary side of the pump and detects a discharge pressure on the discharge side of the pump;
This is an estimated terminal pressure constant control method, and in the flow range from the stop flow rate to the rated flow rate, the output frequency or flow rate increases from the first target discharge pressure at the stop flow rate to the second target discharge pressure at the rated flow rate. And controlling the output of the pump based on the fluctuation target discharge pressure that fluctuates
A pressure increasing water supply apparatus comprising: a control unit that fixes the fluctuation target discharge pressure for a predetermined time when a fluctuation amount of the second suction pressure is equal to or greater than a predetermined fluctuation reference value.
[6]
With a plurality of the pumps,
A suction pipe from the suction port to the backflow prevention device, a suction connection pipe having a flow path connected to the secondary side of the backflow prevention device and leading to the pump suction ports of the plurality of pumps, and a pump discharge port of the pump A discharge connection pipe having a separate discharge flow path, a bypass flow path communicating with the suction connection pipe, and a discharge port communicating with the water supply destination, and a check valve provided on the discharge side of the pump , Plumbing,
A pressure increase water supply apparatus according to any one of [1] to [5], comprising a flow rate detection unit disposed in the individual discharge flow path.
[7]
A first suction pressure on the primary side of the backflow prevention device arranged on the primary side of the pump;
A second suction pressure between the backflow prevention device and the pump;
Detecting the discharge pressure on the secondary side of the pump;
The output of the pump is controlled based on the discharge pressure, and the first suction pressure is equal to or higher than a first reference value during operation of the pump, and the second suction pressure is set lower than the first reference value. The control method of the pressure increase water supply apparatus which stops the said pump when the state which is more than the 2nd reference value made continues for the predetermined time.
[8]
During operation of the pump, when the first suction pressure is equal to or lower than the third reference value or the second suction pressure is equal to or lower than the fourth reference value, the pump is stopped, and the pump is stopped while the pump is stopped. The control method of the pressure increasing water supply apparatus according to [7], wherein the pump is operated when one suction pressure is equal to or higher than a fifth reference value higher than the third reference value.
[9]
When the difference between the second suction pressure and the discharge pressure is within a predetermined value during operation of the pump, or when the difference between the first suction pressure and the second suction pressure is predetermined during operation of the pump The control method of the pressure increase water supply apparatus of [7] or [8] which performs an alerting | reporting process when it is within a value.
[10]
A first suction pressure on the primary side of the backflow prevention device arranged on the primary side of the pump;
A second suction pressure between the backflow prevention device and the pump;
Detecting the discharge pressure on the secondary side of the pump.
In the flow rate range from the stop flow rate to the rated flow rate, the pump is based on a target pressure that varies with an increase in output frequency or flow rate from the first target discharge pressure at the stop flow rate to the second target discharge pressure at the rated flow rate. And controlling the output of
The control method of the pressure increasing water supply apparatus which fixes a target pressure for a predetermined time when the fluctuation | variation amount of the said 2nd suction pressure becomes more than predetermined | prescribed fluctuation | variation reference value.
Claims (10)
前記ポンプの一次側に配された逆流防止装置と、
前記逆流防止装置の一次側に配され、前記ポンプの吸込側の第１吸込圧力を検出する第１吸込圧力検出部と、
前記逆流防止装置と前記ポンプの間に配され、前記ポンプの吸込側の第２吸込圧力を検出する第２吸込圧力検出部と、
前記ポンプの二次側に配され、前記ポンプの吐出側の吐出圧力を検出する吐出圧力検出部と、
前記吐出圧力に基づいて前記ポンプの出力を制御するとともに、前記ポンプの運転中に前記第１吸込圧力が目標圧力である第１基準値以上であって、かつ前記第２吸込圧力が前記第１基準値より低く設定された始動圧力である第２基準値以上となる状態が所定時間継続した場合に、前記ポンプを停止するとともに、
前記ポンプの停止中に第１吸込圧力が第１基準値未満もしくは第２吸込圧力が第２基準値未満となった場合、前記ポンプを再始動する制御部と、を備える増圧給水装置。 A pump,
A backflow prevention device disposed on the primary side of the pump;
A first suction pressure detector that is disposed on the primary side of the backflow prevention device and detects a first suction pressure on the suction side of the pump;
A second suction pressure detector that is disposed between the backflow prevention device and the pump and detects a second suction pressure on the suction side of the pump;
A discharge pressure detector that is disposed on the secondary side of the pump and detects a discharge pressure on the discharge side of the pump;
The pump output is controlled based on the discharge pressure, the first suction pressure is equal to or higher than a first reference value that is a target pressure during the operation of the pump, and the second suction pressure is the first suction pressure. When the state that is equal to or higher than the second reference value, which is the starting pressure set lower than the reference value, continues for a predetermined time, the pump is stopped,
And a control unit that restarts the pump when the first suction pressure is less than the first reference value or the second suction pressure is less than the second reference value while the pump is stopped.
前記ポンプの一次側に配された逆流防止装置と、
前記逆流防止装置の一次側に配され、前記ポンプの吸込側の第１吸込圧力を検出する第１吸込圧力検出部と、
前記逆流防止装置と前記ポンプの間に配され、前記ポンプの吸込側の第２吸込圧力を検出する第２吸込圧力検出部と、
前記ポンプの二次側に配され、前記ポンプの吐出側の吐出圧力を検出する吐出圧力検出部と、
推定末端圧一定制御方式であって、停止流量から定格流量までの流量域において、停止流量時の第１目標吐出圧力から定格流量時の第２目標吐出圧力まで、出力周波数あるいは流量の増加に伴って変動する変動目標吐出圧力に基づいて前記ポンプの出力を制御するとともに、
前記第２吸込圧力の変動量が所定の変動基準値以上となった場合には、所定時間前記変動目標吐出圧力を固定する、制御部と、を備える増圧給水装置。 A pump,
A backflow prevention device disposed on the primary side of the pump;
A first suction pressure detector that is disposed on the primary side of the backflow prevention device and detects a first suction pressure on the suction side of the pump;
A second suction pressure detector that is disposed between the backflow prevention device and the pump and detects a second suction pressure on the suction side of the pump;
A discharge pressure detector that is disposed on the secondary side of the pump and detects a discharge pressure on the discharge side of the pump;
This is an estimated terminal pressure constant control method, and in the flow range from the stop flow rate to the rated flow rate, the output frequency or flow rate increases from the first target discharge pressure at the stop flow rate to the second target discharge pressure at the rated flow rate. And controlling the output of the pump based on the fluctuation target discharge pressure that fluctuates
A pressure increasing water supply apparatus comprising: a control unit that fixes the fluctuation target discharge pressure for a predetermined time when a fluctuation amount of the second suction pressure is equal to or greater than a predetermined fluctuation reference value.
吸込口から逆流防止装置に至る吸込配管と、前記逆流防止装置の二次側に接続され複数の前記ポンプのポンプ吸込口に至る流路を有する吸込連結管と、前記ポンプのポンプ吐出口に接続される個別吐出流路と、前記吸込連結管に連通するバイパス流路と、給水先に連通する吐出口と、を有する吐出連結管と、を備え、前記ポンプの吐出側に逆止弁を備える、配管と、
前記個別吐出流路に配される流量検出部と、を備える、請求項１乃至５のいずれか記載の増圧給水装置。 With a plurality of the pumps,
A suction pipe from the suction port to the backflow prevention device, a suction connection pipe having a flow path connected to the secondary side of the backflow prevention device and leading to the pump suction ports of the plurality of pumps, and a pump discharge port of the pump A discharge connection pipe having a separate discharge flow path, a bypass flow path communicating with the suction connection pipe, and a discharge port communicating with the water supply destination, and a check valve provided on the discharge side of the pump , Plumbing,
The pressure increase water supply apparatus of any one of Claims 1 thru | or 5 provided with the flow volume detection part distribute | arranged to the said separate discharge flow path.
前記逆流防止装置と前記ポンプの間の第２吸込圧力と
前記ポンプの二次側の吐出圧力と、を検出し、
前記吐出圧力に基づいて前記ポンプの出力を制御するとともに、前記ポンプの運転中に前記第１吸込圧力が第１基準値以上であって、前記第２吸込圧力が前記第１基準値より低く設定された第２基準値以上である状態が所定時間継続した場合に、前記ポンプを停止する、増圧給水装置の制御方法。 A first suction pressure on the primary side of the backflow prevention device arranged on the primary side of the pump;
Detecting a second suction pressure between the backflow prevention device and the pump and a discharge pressure on the secondary side of the pump;
The output of the pump is controlled based on the discharge pressure, and the first suction pressure is equal to or higher than a first reference value during operation of the pump, and the second suction pressure is set lower than the first reference value. The control method of the pressure increase water supply apparatus which stops the said pump when the state which is more than the 2nd reference value made continues for the predetermined time.
前記逆流防止装置と前記ポンプの間の第２吸込圧力と
前記ポンプの二次側の吐出圧力と、を検出し
停止流量から定格流量までの流量域において、停止流量時の第１目標吐出圧力から定格流量時の第２目標吐出圧力まで、出力周波数あるいは流量の増加に伴って変動する目標圧力に基づいて前記ポンプの出力を制御するとともに、
前記第２吸込圧力の変動量が所定の変動基準値以上となった場合には、所定時間、目標圧力を固定する増圧給水装置の制御方法。 A first suction pressure on the primary side of the backflow prevention device arranged on the primary side of the pump;
The second suction pressure between the backflow prevention device and the pump and the discharge pressure on the secondary side of the pump are detected, and from the first target discharge pressure at the stop flow rate in the flow range from the stop flow rate to the rated flow rate Control the output of the pump based on the target pressure that varies with an increase in the output frequency or flow rate up to the second target discharge pressure at the rated flow rate,
The control method of the pressure increasing water supply apparatus which fixes a target pressure for a predetermined time when the fluctuation | variation amount of the said 2nd suction pressure becomes more than predetermined | prescribed fluctuation | variation reference value.
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| JP2021105347A (en) * | 2019-12-26 | 2021-07-26 | 株式会社川本製作所 | Water supply device |
| CN115030904A (en) * | 2022-06-30 | 2022-09-09 | 朱志海 | Pressure control type circulating booster pump |
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| JPH09119376A (en) * | 1996-08-23 | 1997-05-06 | Hitachi Ltd | Water supply device for water system and method for operating pump thereof |
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| JP2021105347A (en) * | 2019-12-26 | 2021-07-26 | 株式会社川本製作所 | Water supply device |
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