JP4650231B2 - Pump suction pipe swirl flow measuring device - Google Patents

Pump suction pipe swirl flow measuring device Download PDF

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JP4650231B2
JP4650231B2 JP2005338006A JP2005338006A JP4650231B2 JP 4650231 B2 JP4650231 B2 JP 4650231B2 JP 2005338006 A JP2005338006 A JP 2005338006A JP 2005338006 A JP2005338006 A JP 2005338006A JP 4650231 B2 JP4650231 B2 JP 4650231B2
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suction pipe
signal
rotating shaft
rotation
swirling
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JP2007147286A (en
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優治 永井
裕一 屋代
一郎 原田
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Hitachi Plant Technologies Ltd
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Description

本発明は、特にポンプ吸込水槽の模型試験時に、吸込管内を流れる水のスワール強さとスワール方向を自動計測する試験装置としてのポンプ吸込管旋回流測定装置に関するものである。
The present invention relates to a pump suction pipe swirl flow measuring device as a test device for automatically measuring the swirl strength and swirl direction of water flowing in a suction pipe, particularly during a model test of a pump suction water tank.

現在、ポンプ吸込水槽試験方法としては、国内では日本機械学会基準の「ポンプの吸込水槽の模型試験法」（JSME S 004-1984）が一般によく知られている。但し、本基準は２００５年に廃止されたため、ターボ機械協会によって、同協会の基準「ポンプ吸込水槽の模型試験方法」（TSJ S 002:2005）が作成された。いずれの基準においても、ポンプ吸込水槽試験方法に関する基本的な考え方を示されたものである。試験方法の主な内容は、空気吸込渦と水中渦を目視観察することが規定されており、これまで多くのユーザによって実施されているところである。   Currently, as a pump suction tank test method, the “Mechanical Test Method for Pump Suction Tank” (JSME S 004-1984), which is a standard of the Japan Society of Mechanical Engineers, is well known in Japan. However, because this standard was abolished in 2005, the turbomachinery association created its standard “Model test method for pump suction tanks” (TSJ S 002: 2005). In any standard, the basic idea about the pump suction water tank test method is shown. The main content of the test method is that visual observation of the air suction vortex and the underwater vortex is prescribed and has been carried out by many users so far.

一方、海外の代表的なポンプ吸込水槽試験方法の基準であるANSI/HI基準「Pump Intake Design」（ANSI/HI 9.8-1998）の中に、「9.8.5 Model tests of intake structures」がある。本基準の主な試験方法の内容は、（１）表面渦と水中渦の目視観察、（２）吸込管内の流速分布の計測、（３）吸込管内の旋回量の計測が記載されている。（１）については、水の中に染料等を入れて、染色された渦を目視観察することが記載されている。（２）については、吸込管内に設置したピトー管か、または同等の計測器等により、管内流れの流速分布を測定することが記載されている。（３）については図５に示すように、吸込管内に４枚の板羽根を取り付けて、その回転数や回転方向を測定し、旋回量（旋回角度θ）を算出するように記載されている。   On the other hand, there is “9.8.5 Model tests of intake structures” in the ANSI / HI standard “Pump Intake Design” (ANSI / HI 9.8-1998), which is the standard for the typical pump suction water tank test methods overseas. The main test methods of this standard include (1) visual observation of surface vortices and underwater vortices, (2) measurement of flow velocity distribution in the suction pipe, and (3) measurement of swirling amount in the suction pipe. Regarding (1), it is described that a dye or the like is put in water and the dyed vortex is visually observed. Regarding (2), it is described that the flow velocity distribution of the flow in the pipe is measured by a Pitot pipe installed in the suction pipe or an equivalent measuring instrument. As for (3), as shown in FIG. 5, four plate blades are attached in the suction pipe, the number of rotations and the direction of rotation are measured, and the turning amount (turning angle θ) is calculated. .

海外の旋回量及び旋回方向を計測している文献によると、羽根のいずれか一枚を他の羽根と異なる色にする方法等により、吸込管内の旋回量及び旋回方向を人間の目視観察により計測が実施されている。   According to the literature measuring the swirling amount and swirling direction overseas, the swirling amount and swirling direction in the suction pipe are measured by visual observation of humans by using a method in which any one of the blades has a different color from the other blades. Has been implemented.

「ポンプの吸込水槽の模型試験法」（JSME S 004-1984）"Model test method for pump suction tank" (JSME S 004-1984) 「ポンプ吸込水槽の模型試験方法」（TSJ S 002:2005）"Model test method for pump suction tank" (TSJ S 002: 2005) 「Pump Intake Design」（ANSI/HI 9.8-1998)"Pump Intake Design" (ANSI / HI 9.8-1998)

ANSI/HI基準「Pump Intake Design」（ANSI/HI 9.8-1998）の「9.8.5 Instrumentation and measuring techniques」において、ポンプ吸込水槽内の吸込管内は、通常は旋回流れの強さやその方向が、非定常的に変動すると記載されている。さらに同基準では、こうした旋回流れの計測にあたって、少なくとも１０分以上の長時間に渡り、一定の時間間隔（例として１０〜３０秒毎）で、吸込管内に取り付けた羽根車の回転数と回転方向を計測することが記載されている。   In the ANSI / HI standard “Pump Intake Design” (ANSI / HI 9.8-1998) “9.8.5 Instrumentation and measuring techniques”, the strength and direction of the swirling flow are usually It is described that it fluctuates constantly. Furthermore, according to the same standard, in the measurement of the swirling flow, the rotation speed and direction of rotation of the impeller mounted in the suction pipe at a constant time interval (for example, every 10 to 30 seconds) for at least 10 minutes or more. Is described.

従来では図６に示すような装置により、１枚の羽根に目印を付ける方法や、羽根のいずれか一枚を他の羽根と異なる色にする方法等により、吸込管内の旋回量及び旋回方向を人間の目視観察により計測されている。従って、羽根車の回転数や回転方向が変動を繰り返す状況下において、長時間に渡り人間の目視観察により計測を実施する場合、人間の労力を必要とすることや、人間の主観が入り、計測誤差等を招くことが懸念され、測定信頼性の確保が困難であった。そのため、検出方法を自動化することにより、高信頼性な測定方法が必要である。   Conventionally, the swirling amount and swirling direction in the suction pipe are adjusted by a method of marking one blade with a device as shown in FIG. 6 or a method of making any one of the blades a different color from the other blades. It is measured by human visual observation. Therefore, when measurement is performed by visual observation of humans over a long period of time under conditions where the rotation speed and rotation direction of the impeller are repeatedly fluctuating, human labor is required and human subjectivity is included. There was a concern about incurring errors and the like, and it was difficult to ensure measurement reliability. Therefore, a highly reliable measurement method is required by automating the detection method.

本発明は上記問題を解決するために提案されたものであり、吸込管内の旋回流の旋回量及び旋回方向を自動で検出することが可能な旋回流測定装置を提供することを目的とする。   The present invention has been proposed to solve the above problem, and an object of the present invention is to provide a swirling flow measurement device capable of automatically detecting the swirling amount and swirling direction of the swirling flow in the suction pipe.

本発明は上記課題を解決するためのものであり、請求項１によるポンプ吸込管旋回流測定装置は、ポンプ吸込水槽の模型試験時に、吸込管内を流れる水の旋回流の旋回量と旋回方向を測定する装置であって、吸込管と、回転軸と、前記吸込管内の上記旋回流を受けて回転するように、吸込管の中心軸に平行に設置された前記回転軸に複数枚の板羽根を取り付けた羽根車と、前記回転軸の軸心を通り軸心と直行するように穿孔した孔と、回転軸を保持するための支柱と、前記回転軸を回転自在に支持する軸受と、支柱内部に設けられた信号発信部及び受信部と、前記支柱内部に設置し前記信号発信部及び前記受信部からの信号を導く信号ケーブルと、前記信号発信部及び前記受信部からの信号を発信及び受信可能であり、かつ回転方向を自動的に判定することができる信号検出機器を備えることを特徴とする。
The present invention is for solving the above-mentioned problems, and the pump suction pipe swirl flow measuring device according to claim 1 is configured to determine the swirl amount and swirl direction of the swirl flow of water flowing in the suction pipe during the model test of the pump suction water tank. An apparatus for measuring , wherein a plurality of plate blades are disposed on the rotation shaft that is installed in parallel to the central axis of the suction pipe so as to rotate by receiving the swirling flow in the suction pipe , the rotation shaft, and the suction pipe. An impeller to which the rotary shaft is attached, a hole drilled so as to pass through the axis of the rotary shaft and perpendicular to the axis, a support for holding the rotary shaft, a bearing for rotatably supporting the rotary shaft, and a post A signal transmission unit and reception unit provided inside, a signal cable that is installed inside the column and guides signals from the signal transmission unit and the reception unit, and transmits signals from the signal transmission unit and the reception unit It is capable of receiving, and the direction of rotation automatically Characterized in that it comprises a signal detection device capable of determining.

また、前記回転軸を保持するための支柱が４本で、前記支柱は前記信号発信部を支柱内部に設けた支柱１本と前記受信部を支柱内部に設けた支柱１本の２本ずつが１組となり、前記２本の支柱は回転軸に対して１８０度対向する位置に１本ずつ配置するよう一直線上に位置し、かつ、この前記２組の直線のなす角度が直交しない位置関係に設置し、それにより前記２組のそれぞれの組から出力される信号に、前記回転軸の回転方向による位相差の違いを生じさせることにより回転方向を判定することを特徴とする。
さらに、前記のポンプ吸込管旋回流測定装置において、前記羽根車に流れが流入する上流側には支柱が存在しない空間が設けてあり、かつ、前記支柱は、前記羽根車から流れが流出する側である下流側に設けてあることを特徴とする。
Further, in struts present 4 for holding the rotary shaft, wherein the strut by two 1-post of which is provided with the receiving unit and one strut provided with the signal generation unit to the inner strut therein struts one set becomes, the two struts located on a straight line to place one by one in a position facing 180 degrees with respect to the rotation axis, and the positional relationship where the angle between the said two pairs of straight lines not perpendicular The rotation direction is determined by causing a difference in phase difference depending on the rotation direction of the rotation shaft in the signals output from the two sets .
Furthermore, in the pump suction pipe swirl flow measuring device, a space where no column is present is provided on the upstream side where the flow flows into the impeller, and the column is a side where the flow flows out from the impeller. It is provided in the downstream which is.

本発明により、ポンプ吸込水槽の模型試験において、吸込管内の旋回流の旋回量及び旋回方向の自動計測が可能となる。   According to the present invention, in the model test of the pump suction water tank, the swirl amount and swirl direction of the swirling flow in the suction pipe can be automatically measured.

図１は、本発明によるポンプ吸込管旋回流測定装置の実施の一形態を示し、（ａ）は縦断面図、（ｂ）は支柱部の横断面図である。このポンプ吸込管旋回流測定装置は吸込水槽試験装置において、吸込管内の旋回流Ｓの旋回量及び旋回方向を測定するための装置である。しかし、用途はこれに限られるものではない。図１において、円筒状の吸込管１があり、上流側（図１下側）より旋回流Ｓが流れ込む。回転軸２は吸込管１の中心線を軸心線とし、支柱４により回転自由に保持されている。回転軸の上流側には羽根車３が備えられており、吸込管内の旋回方向の成分のみを受けて回転するよう、吸込管１の中心線に平行な板羽根である。羽根車３は４枚羽根で、それぞれ羽根間角度は９０度の等間隔である。
1A and 1B show an embodiment of a pump suction pipe swirl flow measuring device according to the present invention, in which FIG. 1A is a longitudinal sectional view and FIG. 1B is a transverse sectional view of a support column. This pump suction pipe swirl flow measuring device is a device for measuring the swirl amount and swirl direction of the swirl flow S in the suction pipe in the suction water tank test apparatus. However, the application is not limited to this. In FIG. 1, there is a cylindrical suction pipe 1, and a swirling flow S flows from the upstream side (lower side in FIG. 1). The rotating shaft 2 is held freely by a support column 4 with the center line of the suction pipe 1 as an axis. An impeller 3 is provided on the upstream side of the rotation shaft, and is a plate blade parallel to the center line of the suction pipe 1 so as to rotate by receiving only the component in the swirl direction in the suction pipe. The impeller 3 has four blades, and the interblade angles are equally spaced by 90 degrees.

図２は、図１（ｂ）の詳細図を示す。回転軸２の下流側には計４本の支柱４が設けられている。なお、４本の支柱（４ａ、４ｂ、４ｃ、４ｄ）の位置関係は、４ａと４ｂ、４ｃと４ｄの２本ずつが１組となり、吸込管内の中心線を挟んで１８０度対向する位置に１本ずつ配置するよう一直線上に位置し、かつ、この２組の直線がなす角度αが直交しない（α≠９０度）位置関係とする。支柱４部分において、回転軸２は軸受け５により支えられている。   FIG. 2 shows a detailed view of FIG. A total of four columns 4 are provided on the downstream side of the rotating shaft 2. Note that the four struts (4a, 4b, 4c, 4d) are in a position where each pair of 4a, 4b, 4c, and 4d forms a pair and is 180 degrees across the center line in the suction pipe. Positions are arranged on a straight line so that they are arranged one by one, and the angle α formed by the two sets of straight lines is not orthogonal (α ≠ 90 degrees). The rotary shaft 2 is supported by bearings 5 in the column 4 portion.

支柱４のそれぞれの内部には、信号の伝達可能なケーブル６と、信号発信部及び信号受信部７が挿入されており、支柱４ａと４ｂの内部にはそれぞれ、ケーブル６ａに接続された信号発信部７ａと、ケーブル６ｂに接続された信号受信部７ｂが挿入されており、同様にして支柱４ｃと４ｄの内部には、ケーブル６ｃに接続された信号発信部７ｃと、ケーブル６ｄに接続された信号受信部７ｄが挿入されている。それぞれのケーブル６は、オシロスコープ等のような、信号を発信及び受信可能な信号検出機器８に接続されている。   A cable 6 capable of transmitting a signal, a signal transmission unit, and a signal reception unit 7 are inserted in each of the columns 4, and each of the columns 4 a and 4 b has a signal transmission connected to the cable 6 a. 7a and a signal receiving unit 7b connected to the cable 6b are inserted. Similarly, inside the support columns 4c and 4d, a signal transmitting unit 7c connected to the cable 6c and a cable 6d are connected. A signal receiver 7d is inserted. Each cable 6 is connected to a signal detection device 8 capable of transmitting and receiving signals, such as an oscilloscope.

回転軸２が支柱４で支持されている位置には、回転軸２の軸心を通る孔２ａが一箇所設けられている。回転軸２が回転する際に、信号発信部７ａより信号が発信され、孔２ａを通り、信号受信部７ｂで受信される電気信号をＸ、信号発信部７ｃより信号が発信され、孔２ａを通り、信号受信部７ｄで受信される電気信号をＹとする。電気信号Ｘ、Ｙを連続的に信号検出機器８で検出すると、横軸が時間ｔであるパルス波形となる。図３に検出されるパルス波形例を示す。回転軸２が１回転する際に、電気信号は２パルス検出する構造となっている。ここで、図２において反時計回りを正回転、時計回りを逆回転とする。正回転の場合、電気信号Ｘが検出された後に、角度＋α分だけ回転し、電気信号Ｙが検出される。逆回転の場合、電気信号Ｙが検出された後に、角度−α分だけ回転し、電気信号Ｘが検出される。このように、回転軸２が回転する際に、電気信号Ｘ、電気信号Ｙのパルス信号により旋回量を計測可能であり、また、パルス位相差αの相違から、回転方向を自動判定することが可能である。   At a position where the rotating shaft 2 is supported by the support column 4, one hole 2 a passing through the axis of the rotating shaft 2 is provided. When the rotating shaft 2 rotates, a signal is transmitted from the signal transmission unit 7a, the electric signal received by the signal reception unit 7b through the hole 2a is X, and the signal is transmitted from the signal transmission unit 7c, and the hole 2a is transmitted. As described above, the electric signal received by the signal receiving unit 7d is Y. When the electric signals X and Y are continuously detected by the signal detection device 8, a pulse waveform having a horizontal axis at time t is obtained. FIG. 3 shows an example of a pulse waveform detected. When the rotary shaft 2 makes one revolution, the electric signal is structured to detect two pulses. Here, in FIG. 2, the counterclockwise rotation is the forward rotation, and the clockwise rotation is the reverse rotation. In the case of normal rotation, after the electric signal X is detected, the electric signal Y is detected by rotating by an angle + α. In the case of reverse rotation, after the electric signal Y is detected, the electric signal X is detected by rotating by the angle −α. Thus, when the rotating shaft 2 rotates, the turning amount can be measured by the pulse signals of the electric signal X and the electric signal Y, and the rotation direction can be automatically determined from the difference in the pulse phase difference α. Is possible.

ここで、前記羽根車３の羽根枚数は４枚に限らない。   Here, the number of blades of the impeller 3 is not limited to four.

前記支柱４は、図２に示す（４ａ、４ｂ、４ｃ、４ｄ）の関係を保つ支柱を含めば、４本以上で設置しても良い。また、図４に示すように、別の支柱９を含む支柱を数箇所に設置しても良く、その場合、支柱本数はそれぞれの箇所の支柱本数同士が最大公約数を持たない本数とする。   If the support | pillar 4 which maintains the relationship of (4a, 4b, 4c, 4d) shown in FIG. Moreover, as shown in FIG. 4, you may install the support | pillar containing another support | pillar 9 in several places, and let the number of support | pillars be the number that the number of support | pillars of each place does not have the greatest common divisor.

前記信号発信手段としては光、電気、磁気、レーザー等を用いることが可能である。   As the signal transmitting means, light, electricity, magnetism, laser, or the like can be used.

（ａ）はポンプ吸込管旋回流測定装置の縦断面図、（ｂ）は支柱部の横断面図。(A) is a longitudinal cross-sectional view of a pump suction pipe swirl flow measuring device, and (b) is a cross-sectional view of a column part. 図１（ｂ）の詳細図。Detail view of FIG. 検出されるパルス波形例。Examples of detected pulse waveforms. 複数の支柱設置箇所を持つポンプ吸込管旋回流測定装置の縦断面図。The longitudinal cross-sectional view of the pump suction pipe swirl flow measuring apparatus with a some support | pillar installation location. ＡＮＳＩ／ＨＩ基準における吸込管内旋回量計測方法を説明する図。The figure explaining the suction pipe turning amount measuring method in ANSI / HI standard. 従来のポンプ吸込管旋回流測定装置図例。An example of a conventional pump suction pipe swirl flow measuring device.

符号の説明Explanation of symbols

１…吸込管、２…回転軸、３…羽根車、４…支柱、５…軸受け、６…ケーブル、７…信号発信部及び信号受信部、８…信号検出機器、Ｓ…旋回流。
DESCRIPTION OF SYMBOLS 1 ... Suction pipe, 2 ... Rotating shaft, 3 ... Impeller, 4 ... Support | pillar, 5 ... Bearing, 6 ... Cable, 7 ... Signal transmission part and signal receiving part, 8 ... Signal detection apparatus, S ... Swirling flow.

Claims (3)

ポンプ吸込水槽の模型試験時に、吸込管内を流れる水の旋回流の旋回量と旋回方向を測定する装置であって、吸込管と、回転軸と、前記吸込管内の上記旋回流を受けて回転するように、吸込管の中心軸に平行に設置された前記回転軸に複数枚の板羽根を取り付けた羽根車と、前記回転軸の軸心を通り軸心と直行するように穿孔した孔と、回転軸を保持するための支柱と、前記回転軸を回転自在に支持する軸受と、支柱内部に設けられた信号発信部及び受信部と、前記支柱内部に設置し前記信号発信部及び前記受信部からの信号を導く信号ケーブルと、前記信号発信部及び前記受信部からの信号を発信及び受信可能であり、かつ回転方向を自動的に判定することができる信号検出機器を備えることを特徴とする
ポンプ吸込管旋回流測定装置。 A device for measuring the swirling amount and swirling direction of the swirling flow of water flowing in the suction pipe during a model test of the pump sucking water tank, which rotates by receiving the swirling flow in the suction pipe , the rotating shaft, and the suction pipe. As described above, an impeller in which a plurality of plate blades are attached to the rotating shaft installed in parallel to the central axis of the suction pipe, and a hole drilled so as to pass through the axis of the rotating shaft and to be perpendicular to the axis. A support for holding the rotating shaft, a bearing for rotatably supporting the rotating shaft, a signal transmitting unit and a receiving unit provided in the supporting column, and the signal transmitting unit and the receiving unit installed inside the supporting column A signal cable for guiding a signal from a signal cable, and a signal detection device capable of transmitting and receiving signals from the signal transmission unit and the reception unit and capable of automatically determining a rotation direction.
Pump suction pipe swirl flow measuring device. 前記回転軸を保持するための支柱が４本で、前記支柱は前記信号発信部を支柱内部に設けた支柱１本と前記受信部を支柱内部に設けた支柱１本の２本ずつが１組となり、前記２本の支柱は回転軸に対して１８０度対向する位置に１本ずつ配置するよう一直線上に位置し、かつ、この前記２組の直線のなす角度が直交しない位置関係に設置し、それにより前記２組のそれぞれの組から出力される信号に、前記回転軸の回転方向による位相差の違いを生じさせることにより回転方向を判定することを特徴とする請求項１に記載のポンプ吸込管旋回流測定装置。 The strut for holding the rotary shaft in four, the strut is the signaling section a two by two is set one strut provided with one and the receiving uprights provided inside strut inner strut next, the two struts located on a straight line to place one by one in a position facing 180 degrees with respect to the rotation axis, and placed in a positional relationship where the angle between the said two pairs of straight lines not perpendicular 2. The pump according to claim 1, wherein the direction of rotation is determined by causing a difference in phase difference depending on the direction of rotation of the rotating shaft in a signal output from each of the two sets. Suction pipe swirl flow measuring device. 請求項１あるいは２において、前記羽根車に流れが流入する上流側には支柱が存在しない空間が設けてあり、かつ、前記支柱は、前記羽根車から流れが流出する側である下流側に設けてあることを特徴とするポンプ吸込管旋回流測定装置。3. The space according to claim 1 or 2, wherein a space where no column is present is provided on the upstream side where the flow flows into the impeller, and the column is provided on the downstream side where the flow flows out from the impeller. A pump suction pipe swirl flow measuring device characterized by that.
JP2005338006A 2005-11-24 2005-11-24 Pump suction pipe swirl flow measuring device Expired - Fee Related JP4650231B2 (en)

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JP5030208B2 (en) * 2007-01-19 2012-09-19 株式会社日立プラントテクノロジー Suction pipe flow velocity measuring device in pump suction water tank model test
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JPS52127262A (en) * 1976-04-16 1977-10-25 Ouyou Chishitsu Chiyousa Jimus Apparatus for measuring very slow speed of flow in hole
JPS54108671A (en) * 1978-02-14 1979-08-25 Iseki Agricult Mach Sensor for tachometer

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52127262A (en) * 1976-04-16 1977-10-25 Ouyou Chishitsu Chiyousa Jimus Apparatus for measuring very slow speed of flow in hole
JPS54108671A (en) * 1978-02-14 1979-08-25 Iseki Agricult Mach Sensor for tachometer

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