JP6134178B2 - Vertical shaft pump device - Google Patents

Vertical shaft pump device Download PDF

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JP6134178B2
JP6134178B2 JP2013065338A JP2013065338A JP6134178B2 JP 6134178 B2 JP6134178 B2 JP 6134178B2 JP 2013065338 A JP2013065338 A JP 2013065338A JP 2013065338 A JP2013065338 A JP 2013065338A JP 6134178 B2 JP6134178 B2 JP 6134178B2
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bearing
water
cooling water
temperature
cooling
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JP2014190207A (en
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美喜男 上甲
美喜男 上甲
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Kubota Corp
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Description

本発明は、下端部に羽根車が取り付けられた主軸が、鉛直姿勢の揚水管に軸受を介して回転可能に支持され、前記軸受に冷却水を供給する冷却機構が設けられている立軸ポンプ装置に関する。   The present invention relates to a vertical shaft pump device in which a main shaft having an impeller attached to a lower end portion thereof is rotatably supported by a vertical lifting water pump via a bearing, and a cooling mechanism for supplying cooling water to the bearing is provided. About.

特許文献1には、立軸ポンプの主軸の軸受を冷却するために、軸受の両端に軸封装置を設け、軸封装置と軸受とを保護管で接続して封水部を形成し、封水部に封水タンクから冷却水を供給するように構成し、軸封装置からの水漏れを封水タンクの水面の変動によって検知して冷却水を自動供給する立軸ポンプ装置が開示されている。   In Patent Document 1, in order to cool the bearing of the main shaft of the vertical shaft pump, a shaft seal device is provided at both ends of the bearing, the shaft seal device and the bearing are connected by a protective tube to form a sealed portion, A vertical shaft pump device is disclosed in which cooling water is supplied to a part from a sealed water tank, and water leakage from the shaft seal device is detected by fluctuations in the water surface of the sealed water tank to automatically supply cooling water.

また、特許文献2には、軸封装置や軸受の摺動熱により潤滑液が昇温し、或いは潤滑液が蒸発等により不足して軸封装置や軸受が焼損する危険性に備えて、貯液タンクから保護管に冷却水を循環供給するように構成し、貯液タンク内の液温に基づいて循環水を冷却する放熱機構を設けた立軸ポンプ装置が開示されている。   Patent Document 2 also discloses a storage for the risk of the temperature of the lubricating liquid rising due to the sliding heat of the shaft sealing device or the bearing, or the lubricating liquid being insufficient due to evaporation or the like, causing the shaft sealing device or the bearing to burn out. There has been disclosed a vertical shaft pump device which is configured to circulate and supply cooling water from a liquid tank to a protective pipe and which is provided with a heat radiation mechanism for cooling the circulating water based on the liquid temperature in the liquid storage tank.

特開平04−334794号公報Japanese Patent Laid-Open No. 04-334794 特開平11−324967号公報Japanese Patent Laid-Open No. 11-324967

上述した従来の立軸ポンプ装置は、良質の冷却水が十分に確保されているという前提の下で、軸封装置としてグランドパッキン等、多少の水漏れが許容される安価なものが用いられており、軸受材料であるゴム部材や樹脂部材が所定の耐熱温度以上に上昇しないように、水漏れ量を見込んだ安全な、多量の水量の冷却水が保護管に供給されるように設定されていた。   The conventional vertical shaft pump device described above is based on the premise that good-quality cooling water is sufficiently secured, and a shaft seal device, such as a gland packing, that is inexpensive and allows some water leakage is used. In order to prevent the rubber material and the resin member as the bearing material from rising above a predetermined heat-resistant temperature, it was set so that a safe and large amount of cooling water was supplied to the protective tube in anticipation of the amount of water leakage. .

しかし、上質の冷却水が十分に確保されない場合には、水漏れが少ないメカニカルシール等の高価な軸封装置や、耐熱性及び耐磨耗性の高い高価なセラミック軸受を用い、或いは冷却水を循環供給するための機構を設ける必要がある等、設備コストが嵩むという問題があった。   However, if high-quality cooling water is not sufficiently secured, use an expensive shaft seal device such as a mechanical seal with little water leakage, an expensive ceramic bearing with high heat resistance and wear resistance, or use cooling water. There was a problem that the equipment cost increased, for example, it was necessary to provide a mechanism for circulating supply.

本発明の目的は、上述の問題点に鑑み、安価な軸受を用いながらも、最小限の水量で効率的に冷却できる冷却機構を備えた立軸ポンプ装置を提供する点にある。   In view of the above problems, an object of the present invention is to provide a vertical shaft pump device including a cooling mechanism capable of efficiently cooling with a minimum amount of water while using an inexpensive bearing.

上述の目的を達成するため、本発明による立軸ポンプ装置の第一の特徴構成は、特許請求の範囲の書類の請求項1に記載した通り、下端部に羽根車が取り付けられた主軸が、鉛直姿勢の揚水管に軸受を介して回転可能に支持され、前記軸受に冷却水を供給する冷却機構が設けられている立軸ポンプ装置であって、前記軸受の下部に設けられた軸封装置と前記軸受とが水密に連結された保護管で前記主軸が被覆されるとともに、前記軸受に流入する冷却水の流入温度及び前記軸受から流出する冷却水の流出温度を検知する温度センサが設けられ、前記冷却機構は吸水タンクと吸水ポンプを含み、両温度の差分値に基づいて前記吸水ポンプにより前記吸水タンクに貯水された冷却水の前記保護管への供給量が可変に調整されるように構成されている点にある。 In order to achieve the above-mentioned object, the first characteristic configuration of the vertical shaft pump device according to the present invention is that, as described in claim 1 of the claims, the main shaft with the impeller attached to the lower end portion is vertical. A vertical shaft pump device that is rotatably supported by a pumped water pipe through a bearing and is provided with a cooling mechanism that supplies cooling water to the bearing, the shaft seal device provided at a lower portion of the bearing, The main shaft is covered with a protective tube that is watertightly connected to the bearing, and a temperature sensor that detects an inflow temperature of the cooling water flowing into the bearing and an outflow temperature of the cooling water flowing out of the bearing is provided, The cooling mechanism includes a water absorption tank and a water absorption pump, and is configured to variably adjust the supply amount of the cooling water stored in the water absorption tank by the water absorption pump based on a difference value between the two temperatures. Have There is a point.

軸受の摺動摩擦による昇温が冷却水で冷却されるため、冷却の前後の冷却水温度の差分値に基づけば、様々な季節変動要因にかかわらず、その時点での冷却水量が適切であるか否かが正確に把握できるようになる。その結果、軸受の発熱の程度が把握でき、その温度に基づいて軸受が焼損しない程度に冷却機構によって軸受への冷却水の供給量が調整される。従って、上水等の良質の冷却水が十分に確保できない環境で、安価な軸受を用いる場合であっても最小限の冷却水量で軸受が冷却できるようになる。 Since the temperature rise due to the sliding friction of the bearing is cooled by the cooling water, whether the amount of cooling water at that time is appropriate based on the difference value of the cooling water temperature before and after cooling regardless of various seasonal fluctuation factors It becomes possible to accurately grasp whether or not. As a result, the degree of heat generation of the bearing can be grasped, and the amount of cooling water supplied to the bearing is adjusted by the cooling mechanism to the extent that the bearing does not burn out based on the temperature. Accordingly, the bearing can be cooled with a minimum amount of cooling water even in the case where an inexpensive bearing is used in an environment where high-quality cooling water such as clean water cannot be sufficiently secured.

同第二の特徴構成は、同請求項2に記載した通り、下端部に羽根車が取り付けられた主軸が、鉛直姿勢の揚水管に軸受を介して回転可能に支持され、前記軸受に冷却水を供給する冷却機構が設けられている立軸ポンプ装置であって、前記軸受の下部に設けられた軸封装置と前記軸受とが水密に連結された保護管で前記主軸が被覆されるとともに、前記軸受を流出する冷却水の温度及び所定の環境温度を検知する温度センサが設けられ、前記冷却機構は吸水タンクと吸水ポンプを含み、両温度の差分値に基づいて前記吸水ポンプにより前記吸水タンクに貯水された冷却水の前記保護管への供給量が可変に調整されるように構成されている点にある。 According to the second characteristic configuration, as described in claim 2, a main shaft having an impeller attached to a lower end portion thereof is rotatably supported by a pumping pipe having a vertical posture via a bearing, and the bearing has cooling water. A vertical shaft pump device provided with a cooling mechanism for supplying the shaft, the shaft sealing device provided at the lower part of the bearing and the bearing is covered with a protection tube in which the bearing is watertightly connected, and the main shaft is covered. A temperature sensor for detecting the temperature of the cooling water flowing out of the bearing and a predetermined environmental temperature is provided, and the cooling mechanism includes a water absorption tank and a water absorption pump, and the water absorption tank is provided with the water absorption pump based on a difference value between the two temperatures. The supply amount of the stored cooling water to the protective pipe is variably adjusted .

軸受を流出する冷却水の温度と所定の環境温度との差分値に基づけば、様々な環境変動要因による誤差を吸収して、軸受を流出する冷却水による冷却能力の正確な値を把握できるようになる。例えば、季節変動による誤差を吸収するために所定の環境温度として大気温度や供給前の冷却水温度等を用いることができる。その結果、軸受の発熱の程度が把握でき、その温度に基づいて軸受が焼損しない程度に冷却機構によって保護管への冷却水の供給量が調整される。この場合、揚水運転中には揚水によって冷却水が放熱されるので、保護管への冷却水の供給量がさらに低減できる。 Based on the difference between the temperature of the cooling water flowing out of the bearing and the predetermined environmental temperature, it is possible to absorb the error due to various environmental fluctuation factors and grasp the accurate value of the cooling capacity of the cooling water flowing out of the bearing. become. For example, the atmospheric temperature, the cooling water temperature before supply, or the like can be used as the predetermined environmental temperature in order to absorb errors due to seasonal fluctuations. As a result, the degree of heat generation of the bearing can be grasped, and the amount of cooling water supplied to the protective tube is adjusted by the cooling mechanism to the extent that the bearing does not burn based on the temperature. In this case, since the cooling water is radiated by the pumping during the pumping operation, the supply amount of the cooling water to the protective tube can be further reduced.

同第三の特徴構成は、同請求項3に記載した通り、上述の第一または第二の特徴構成に加えて、前記軸受は、ゴム軸受または樹脂軸受である点にある。 As described in the third aspect, the third characteristic configuration is that, in addition to the first or second characteristic configuration described above, the bearing is a rubber bearing or a resin bearing .

安価な軸受としてゴム軸受または樹脂軸受を好適に用いることができる。A rubber bearing or a resin bearing can be suitably used as an inexpensive bearing.

同第四の特徴構成は、同請求項4に記載した通り、上述の第一から第三の何れかの特徴構成に加えて、前記冷却水は、上水を含む良質の水が用いられる点にある。 In the fourth feature configuration, as described in claim 4, in addition to any of the first to third feature configurations described above, the cooling water is made of high-quality water including clean water. It is in.

少量の冷却水であっても軸受の摩耗を回避して良好に冷却することができる。Even with a small amount of cooling water, it is possible to avoid the wear of the bearing and cool it well.

同第五の特徴構成は、同請求項5に記載した通り、上述の第一から第四の何れかの特徴構成に加えて、前記給水ポンプを常時低速駆動し或いは間歇的に駆動して、前記保護管の下端側から冷却水を供給し、前記保護管に備えた上部軸封装置から冷却水が僅かに溢流する程度の微量を継続的に供給する冷却制御部を備えている点にある。 In addition to any of the first to fourth feature configurations described above, the fifth feature configuration is always driven at a low speed or intermittently, in addition to any of the first to fourth feature configurations described above, A cooling control unit that supplies cooling water from the lower end side of the protective tube and continuously supplies a minute amount of cooling water slightly overflowing from the upper shaft seal device provided in the protective tube is provided. is there.

給水ポンプを用いて適量の冷却水を適切に給水できる。An appropriate amount of cooling water can be appropriately supplied using a water supply pump.

以上説明した通り、本発明によれば、安価な軸受を用いながらも、最小限の水量で効率的に冷却できる冷却機構を備えた立軸ポンプ装置を提供することができるようになった。   As described above, according to the present invention, it is possible to provide a vertical shaft pump device including a cooling mechanism capable of efficiently cooling with a minimum amount of water while using an inexpensive bearing.

本発明の第一の実施形態を示す立軸斜流ポンプの説明図Explanatory drawing of the vertical axis mixed flow pump which shows 1st embodiment of this invention 本発明の第二の実施形態を示す立軸斜流ポンプの説明図Explanatory drawing of the vertical-shaft mixed flow pump which shows 2nd embodiment of this invention 本発明の要部の説明図Explanatory drawing of the main part of the present invention 本発明の別実施形態の要部の説明図Explanatory drawing of the principal part of another embodiment of this invention 本発明の別実施形態の要部の説明図Explanatory drawing of the principal part of another embodiment of this invention

以下に本発明による立軸ポンプ装置を説明する。
図1には、第一の態様が示され、立軸ポンプ装置の一例として、立軸斜流ポンプ装置P(以下、「立軸ポンプP」と記す。)が示されている。立軸ポンプPは、下端部に羽根車3が取り付けられた主軸2が、鉛直姿勢の揚水管6に複数のゴム軸受1(以下、「軸受1」と記す。)を介して回転可能に支持され、揚水管6の先端に羽根車3を収容する吐出しボウル4が接続され、さらに吐出しボウル4の先端に吸込ベル5が接続されて構成されている。
The vertical shaft pump device according to the present invention will be described below.
FIG. 1 shows a first embodiment, and an vertical shaft mixed flow pump device P (hereinafter referred to as “vertical pump P”) is shown as an example of a vertical shaft pump device. In the vertical shaft pump P, a main shaft 2 having an impeller 3 attached to a lower end thereof is rotatably supported by a vertical lifting pump 6 via a plurality of rubber bearings 1 (hereinafter referred to as “bearings 1”). The discharge bowl 4 that houses the impeller 3 is connected to the tip of the pumping pipe 6, and the suction bell 5 is connected to the tip of the discharge bowl 4.

揚水管6の上端側には、主軸2が水密かつ回転自在に貫通される吐出曲管9が接続され、主軸2がカップリングを介して駆動機10の出力軸に接続されている。   A discharge bend pipe 9 through which the main shaft 2 penetrates in a watertight and rotatable manner is connected to the upper end side of the pumping pipe 6, and the main shaft 2 is connected to the output shaft of the drive unit 10 through a coupling.

羽根車側の軸受1の下方にメカニカルシールやグランドパッキンを用いた下部軸封装置11が設けられ、主軸2の上方の吐出曲管9との接合部にはラビリンスシール等を用いた上部軸封装置12が設けられている。   A lower shaft seal device 11 using a mechanical seal or a gland packing is provided below the impeller-side bearing 1, and an upper shaft seal using a labyrinth seal or the like at the joint with the discharge curved pipe 9 above the main shaft 2. A device 12 is provided.

主軸2が、軸封装置11,12と各軸受1とが水密に連結された保護管13で被覆され、ゴム製の軸受1を冷却するための冷却水を保護管13に供給する冷却機構20が設けられている。   The main shaft 2 is covered with a protective tube 13 in which the shaft seal devices 11 and 12 and the bearings 1 are connected in a watertight manner, and a cooling mechanism 20 that supplies cooling water for cooling the rubber bearing 1 to the protective tube 13. Is provided.

冷却機構20は、給水タンク22と給水ポンプ23と給水管24と冷却制御部25とを備えて構成され、給水タンク22に貯水された冷却水が給水ポンプ23によって汲み上げられ、給水管24及び案内羽根14に形成された給水路21を経由して保護管13の下端側から供給され、余剰給水は上部軸封装置12から溢流するように構成されている。タンク22に貯留される水は上水が好ましいが、立軸ポンプPで揚水された水に含まれる固形分を沈殿処理等で除去した上澄み水を用いてもよい。   The cooling mechanism 20 includes a water supply tank 22, a water supply pump 23, a water supply pipe 24, and a cooling control unit 25. The cooling water stored in the water supply tank 22 is pumped up by the water supply pump 23, and the water supply pipe 24 and the guide are provided. It is supplied from the lower end side of the protective tube 13 via a water supply path 21 formed in the blade 14, and excess water supply is configured to overflow from the upper shaft seal device 12. The water stored in the tank 22 is preferably clean water, but it is also possible to use supernatant water from which solid content contained in the water pumped by the vertical shaft pump P has been removed by precipitation or the like.

最上段の軸受1には、測温抵抗体(RTD)または熱電対等を用いた温度センサSが組み込まれ、温度センサSにより検知された温度が冷却制御部25に入力されるように構成されている。温度センサSは、軸受1を冷却した冷却水の温度が検知可能にゴム製の軸受部位の近傍に設置されている。   A temperature sensor S using a resistance temperature detector (RTD), a thermocouple, or the like is incorporated in the uppermost bearing 1, and a temperature detected by the temperature sensor S is input to the cooling control unit 25. Yes. The temperature sensor S is installed in the vicinity of the rubber bearing portion so that the temperature of the cooling water that has cooled the bearing 1 can be detected.

冷却制御部25(冷却機構20)は温度センサSの値に基づいて、保護管13つまり軸受1への冷却水の供給量を調整するように構成されている。温度センサSによって軸受1を冷却した冷却水の温度が検知されることにより、軸受1の発熱の程度が把握でき、その温度に基づいて軸受が焼損しない程度に冷却制御部25によって軸受1への冷却水の供給量が調整される。従って、上水等の良質の冷却水が給水タンク22に十分に確保できない環境で、安価な軸受1を用いる場合であっても最小限の冷却水量で軸受1が冷却できるようになる。   The cooling control unit 25 (cooling mechanism 20) is configured to adjust the amount of cooling water supplied to the protective tube 13, that is, the bearing 1, based on the value of the temperature sensor S. By detecting the temperature of the cooling water that has cooled the bearing 1 by the temperature sensor S, the degree of heat generation of the bearing 1 can be grasped, and the cooling controller 25 supplies the bearing 1 to the extent that the bearing does not burn based on the temperature. The amount of cooling water supplied is adjusted. Therefore, the bearing 1 can be cooled with a minimum amount of cooling water even in the case where the inexpensive bearing 1 is used in an environment where high-quality cooling water such as clean water cannot be sufficiently secured in the water supply tank 22.

保護管13の下端側から冷却水が供給される場合には、冷却水が下方から上方に供給されるので、冷却水量が少なくなったときに最も影響がある主軸2の最上部に設置された軸受1を流出する冷却水の温度を指標にすれば効率的に水量を調整できる。   When the cooling water is supplied from the lower end side of the protective tube 13, the cooling water is supplied from the lower side to the upper side. Therefore, the cooling water is installed on the uppermost part of the main shaft 2 having the greatest influence when the cooling water amount decreases. If the temperature of the cooling water flowing out of the bearing 1 is used as an index, the amount of water can be adjusted efficiently.

尚、温度センサSは、軸受本体、例えばゴム軸受であれば摺動部のゴムを保持するバックメタルまたはゴム部分に埋め込み設置して、軸受本体の温度に基づいて冷却制御部が冷却制御するように構成してもよい。   The temperature sensor S is embedded in a bearing body, for example, a back metal or rubber portion that holds the rubber of the sliding portion in the case of a rubber bearing, and the cooling control unit controls cooling based on the temperature of the bearing body. You may comprise.

以下、詳述する。冷却制御部25は、先ず給水ポンプ23を駆動して冷却水を最上部の軸受1の上部まで給水する。給水ポンプ23による給水量が既知であるので、例えば給水ポンプ23の駆動時間を制御することで、所定量の給水が可能になる。尚、保護管13の水位を検知して給水ポンプ23を停止するように構成してもよい。   Details will be described below. The cooling control unit 25 first drives the water supply pump 23 to supply the cooling water to the upper part of the uppermost bearing 1. Since the amount of water supplied by the water supply pump 23 is known, for example, by controlling the drive time of the water supply pump 23, a predetermined amount of water can be supplied. In addition, you may comprise so that the water level of the protective tube 13 may be detected and the water supply pump 23 may be stopped.

次に、駆動機10を立ち上げて立軸ポンプPを駆動し、揚水管6への揚水を開始する。主軸2の回転によって軸受1は発熱するが、揚水運転中に揚水によって保護管13を介して冷却水が放熱される場合には、保護管13への新たな冷却水の供給は不要となる場合もある。以下の説明は、揚水運転中に限らず、先行待機運転等、揚水せずに主軸2を回転させる場合でも同様である。尚、駆動機10の位置に減速機を設け、減速機と駆動連結する駆動機を別に配置してもよい。   Next, the driving machine 10 is started up and the vertical shaft pump P is driven to start pumping water to the pumping pipe 6. When the main shaft 2 rotates, the bearing 1 generates heat, but when cooling water is dissipated through the protective tube 13 during pumping operation, it is not necessary to supply new cooling water to the protective tube 13. There is also. The following description is the same not only during the pumping operation but also when the main shaft 2 is rotated without pumping, such as a preliminary standby operation. In addition, a speed reducer may be provided at the position of the drive machine 10 and a drive machine that is drivingly connected to the speed reducer may be arranged separately.

保護管13内の冷却水が下部軸封装置11から漏れ出して、冷却水の水位が低下すると、温度センサSによって昇温が検知され、所定の閾値温度を超えると給水ポンプ23を駆動して冷却水を追加供給する。給水ポンプ23の駆動時間を制御して一定量を追加供給するように構成してもよいし、温度センサSによる検知温度が所定の閾値温度より低下するまで追加供給するように構成してもよい。冷却水を追加供給する閾値温度よりも追加供給を停止する閾値温度を低く設定するヒステリシスを持たせてもよい。また、測定データの履歴を監視して、温度上昇を予測して冷却水を供給制御してもよく、閾値を複数持たせて供給量を変えるように構成してもよい。   When the cooling water in the protective tube 13 leaks from the lower shaft seal device 11 and the water level of the cooling water decreases, the temperature sensor S detects the temperature rise. When the temperature exceeds a predetermined threshold temperature, the water supply pump 23 is driven. Supply additional cooling water. The driving time of the water supply pump 23 may be controlled so that a certain amount is additionally supplied, or it may be additionally supplied until the temperature detected by the temperature sensor S falls below a predetermined threshold temperature. . You may give the hysteresis which sets the threshold temperature which stops additional supply rather than the threshold temperature which additionally supplies cooling water. Further, the history of measurement data may be monitored to control the supply of cooling water by predicting a temperature rise, or the supply amount may be changed by providing a plurality of threshold values.

軸受1を流出する冷却水の温度及び所定の環境温度を検知するように、温度センサSを最上部の軸受1と給水タンク22の双方に設けて、冷却制御部25が、両温度の差分値に基づいて冷却水の供給量を調整するように構成することが好ましい。軸受1を流出する冷却水の温度と給水タンク22の水温との差分値に基づけば、単に軸受1を流出する冷却水の温度のみに基づいて制御する場合の季節変動による水温変化に起因する誤差を吸収することができるようになる点で好ましい。   A temperature sensor S is provided in both the uppermost bearing 1 and the water supply tank 22 so as to detect the temperature of the cooling water flowing out of the bearing 1 and a predetermined environmental temperature, and the cooling control unit 25 determines the difference value between the two temperatures. It is preferable that the supply amount of the cooling water is adjusted based on the above. Based on the difference between the temperature of the cooling water flowing out of the bearing 1 and the temperature of the water supply tank 22, an error caused by a change in the water temperature due to seasonal variation when controlling based solely on the temperature of the cooling water flowing out of the bearing 1. Is preferable in that it can be absorbed.

例えば耐熱温度が約60℃のゴム軸受について、給水タンク22から給水される冷却水の温度は夏場と冬場で大きく異なるため、冷却水の供給の可否を判断する閾値温度を例えば一律の50℃に設定すると、例えば夏場に過剰に冷却水を供給することになる虞があり、冬場に軸受1の焼損を招くことになる虞がある。そのような場合でも、差分値に基づけば一律の閾値であっても安定的に制御できるようになる。   For example, for a rubber bearing having a heat resistant temperature of about 60 ° C., the temperature of the cooling water supplied from the water supply tank 22 differs greatly between summer and winter, so the threshold temperature for determining whether or not cooling water can be supplied is, for example, a uniform 50 ° C. If it is set, for example, the cooling water may be excessively supplied in summer, and the bearing 1 may be burned out in winter. Even in such a case, based on the difference value, it becomes possible to stably control even if the threshold value is uniform.

環境温度を検知するために設ける温度センサは、給水タンク22に設置される態様に限ることはなく、大気温度を検知するように温度センサを設置してもよいし、揚水対象水の水温を検視するように温度センサを設置してもよい。環境温度を検知すれば、様々な環境変動要因による誤差を吸収して、軸受1を流れる冷却水による冷却能力の正確な値を把握できるようになる。   The temperature sensor provided for detecting the environmental temperature is not limited to the mode installed in the water supply tank 22, and a temperature sensor may be installed so as to detect the atmospheric temperature, and the water temperature of the pumping target water is inspected. You may install a temperature sensor so that. If the environmental temperature is detected, errors due to various environmental fluctuation factors can be absorbed, and an accurate value of the cooling capacity of the cooling water flowing through the bearing 1 can be grasped.

冷却水の供給の可否を差分値で判断する場合も、給水の開始と停止とで差分の閾値にヒステリシスを設定することが可能である。   Even when it is determined whether or not the cooling water can be supplied based on the difference value, it is possible to set a hysteresis in the threshold value of the difference between the start and stop of the water supply.

冷却制御部25が給水ポンプ23を常時低速駆動し或いは間歇的に駆動して、保護管13の上部軸封装置12から冷却水が僅かに溢流する程度の微量を継続的に供給するように制御する場合でも本発明を適用できる。   The cooling controller 25 continuously drives the water supply pump 23 at a low speed or intermittently so as to continuously supply a minute amount of cooling water slightly overflowing from the upper shaft seal device 12 of the protective tube 13. The present invention can be applied even when controlling.

例えば、温度センサSによって検知された温度と所定の閾値温度との偏差に基づいて給水ポンプ23からの給水量を増量または減量することによって、常に必要な大量の冷却水の供給と比べて僅かな冷却水量で軸受1の焼損を回避することができるようになる。   For example, by increasing or decreasing the amount of water supplied from the water supply pump 23 based on the deviation between the temperature detected by the temperature sensor S and a predetermined threshold temperature, the amount of cooling water is always slightly smaller than the required amount of cooling water supplied. Burnout of the bearing 1 can be avoided by the amount of cooling water.

上述のように温度センサSによって検知された温度と環境温度との差分値を求め、当該差分値と所定の閾値温度との偏差に基づいて給水ポンプ23からの給水量を増量または減量するように制御してもよい。そして、この場合、制御態様としてPID制御を採用することが好ましい。   As described above, a difference value between the temperature detected by the temperature sensor S and the environmental temperature is obtained, and the amount of water supplied from the water supply pump 23 is increased or decreased based on the deviation between the difference value and a predetermined threshold temperature. You may control. In this case, it is preferable to adopt PID control as the control mode.

図2には、第二の態様が示されている。第一の態様と異なる点は、保護管13の上端側から冷却水が供給されるように構成され、温度センサSは主軸2の最下部に設置された軸受1を流出する冷却水の温度を検知するように構成されている点である。尚、図1と同じ部位には同じ符号を付してその部位の説明を省略する。   FIG. 2 shows a second embodiment. The difference from the first mode is that cooling water is supplied from the upper end side of the protective tube 13, and the temperature sensor S determines the temperature of the cooling water flowing out of the bearing 1 installed at the lowermost part of the main shaft 2. It is the point comprised so that it may detect. In addition, the same code | symbol is attached | subjected to the same site | part as FIG. 1, and description of the site | part is abbreviate | omitted.

保護管13の上端側から冷却水が供給される場合には、冷却水が上方から下方に供給されるので、冷却水量が少なくなったときに最も影響があり、温度が上昇しやすい主軸の最下部に設置された軸受を流出する冷却水の温度を指標にすれば効率的に水量を調整できる。   When the cooling water is supplied from the upper end side of the protective tube 13, the cooling water is supplied from the upper side to the lower side. The amount of water can be adjusted efficiently by using the temperature of the cooling water flowing out from the bearing installed at the bottom as an index.

第二の態様でも、既に説明したような軸受を流出する冷却水の温度と所定の環境温度との差分値に基づいて冷却水の給水制御を行なうことが可能であり、また冷却水を追加するための閾値と停止するための閾値にヒステリシスを持たせることも可能である。   Also in the second aspect, it is possible to perform the cooling water supply control based on the difference value between the temperature of the cooling water flowing out of the bearing as described above and the predetermined environmental temperature, and the cooling water is added. It is also possible to give hysteresis to the threshold value for stopping and the threshold value for stopping.

上述の例では、軸受1を流出する冷却水の温度を検知する温度センサSを最上部の軸受1または最下部の軸受1に備える態様を説明したが、各軸受1に温度センサSを備えて、少なくとも一つの軸受1で閾値温度を超えたときに冷却水を追加供給するように構成してもよい。   In the above-described example, the mode in which the temperature sensor S that detects the temperature of the cooling water flowing out of the bearing 1 is provided in the uppermost bearing 1 or the lowermost bearing 1 has been described, but each bearing 1 is provided with the temperature sensor S. The cooling water may be additionally supplied when the threshold temperature is exceeded by at least one bearing 1.

第一及び第二の態様の何れであっても、最上部の軸受と最下部の軸受の二箇所に温度センサSを組み込み、何れか一方が閾値温度を超えると冷却水を追加供給するように構成してもよい。最上部の軸受に備えた温度センサSで水位の低下を間接的に把握でき、羽根車3という最も大きな負荷がかかり最も発熱しやすい最下部の軸受に備えた温度センサSで最も厳しい冷却環境を把握することができる。   In any of the first and second aspects, the temperature sensor S is incorporated in two locations, the uppermost bearing and the lowermost bearing, and if either one exceeds the threshold temperature, cooling water is additionally supplied. It may be configured. The temperature sensor S provided in the uppermost bearing can indirectly grasp the drop in the water level, and the most severe cooling environment is provided by the temperature sensor S provided in the lowermost bearing that is subjected to the largest load and is most likely to generate heat. I can grasp it.

さらに、図3に示すように、軸受1に流入する冷却水の流入温度及び軸受1から流出する冷却水の流出温度を検知する温度センサS1,S2を備え、冷却制御部25が両温度の差分値に基づいて冷却水の供給量を調整するように構成してもよい。尚、第一の態様では、温度センサS2で流入温度が検知され、第二の態様では温度センサS1で流入温度が検知されることになる。   Further, as shown in FIG. 3, temperature sensors S1 and S2 for detecting the inflow temperature of the cooling water flowing into the bearing 1 and the outflow temperature of the cooling water flowing out of the bearing 1 are provided, and the cooling control unit 25 has a difference between the two temperatures. You may comprise so that the supply_amount | feed_rate of cooling water may be adjusted based on a value. In the first aspect, the inflow temperature is detected by the temperature sensor S2, and in the second aspect, the inflow temperature is detected by the temperature sensor S1.

温度センサS1,S2の差分値によれば、軸受の摺動摩擦による昇温が冷却水で冷却される程度が明確に把握できるようになるので、環境温度の変動による影響を抑制でき、様々な季節変動要因にかかわらず、その時点での冷却水量が適切であるか否かが正確に把握できるようになる。   According to the difference value of the temperature sensors S1 and S2, it becomes possible to clearly grasp the degree of temperature rise due to the sliding friction of the bearing cooled by the cooling water. Regardless of the fluctuation factors, it is possible to accurately grasp whether or not the amount of cooling water at that time is appropriate.

温度センサS1,S2の信号線(図中、一点鎖線で示されている。)は、例えば軸受1の支持部30を鋳込むときに形成される信号線挿通孔を経由して取り出すことができる。   The signal lines of the temperature sensors S1 and S2 (indicated by the alternate long and short dash line in the figure) can be taken out via a signal line insertion hole formed when casting the support portion 30 of the bearing 1, for example. .

この場合も、既述したように、温度センサS1,S2の差分値が所定の給水閾値を超えると給水開始し、給水閾値より低い所定の停止閾値を下回ると給水停止するように冷却制御部25を構成すればよい。   Also in this case, as described above, the cooling control unit 25 starts water supply when the difference value between the temperature sensors S1 and S2 exceeds a predetermined water supply threshold value and stops water supply when the difference value falls below a predetermined stop threshold value lower than the water supply threshold value. May be configured.

また、温度センサS1,S2の差分値と所定の閾値との差分値に基づいて、急水量を増加または減少制御するように冷却制御部25を構成してもよい。   Further, the cooling control unit 25 may be configured to increase or decrease the amount of rapid water based on the difference value between the temperature sensors S1 and S2 and a predetermined threshold value.

以上の説明では主軸2に保護管13が設けられ、保護管13に冷却水が供給される例を説明したが、個々の軸受1にそれぞれ冷却水が供給されるような構成であっても本発明を適用することができる。   In the above description, an example in which the main shaft 2 is provided with the protective tube 13 and the cooling water is supplied to the protective tube 13 has been described. The invention can be applied.

例えば、図4に示すように、軸受1の支持部30に冷却水の給水路31と排水路32を形成するとともに、軸受1の上下端にオイルシール33を設けて、給水路31から供給される冷却水が軸受1の内部を通流して排水路32に排出されるように構成してもよい。   For example, as shown in FIG. 4, a cooling water supply passage 31 and a drainage passage 32 are formed in the support portion 30 of the bearing 1, and oil seals 33 are provided at the upper and lower ends of the bearing 1, and supplied from the water supply passage 31. The cooling water may flow through the inside of the bearing 1 and be discharged to the drainage channel 32.

そして、軸受1の両端部に温度センサS1,S2を備え、冷却制御部25が両温度センサS1,S2の差分値に基づいて冷却水の供給量を増減するように構成することができる。この場合、各軸受1に供給され、排水路32から排水された冷却水を給水タンク22に戻して循環供給するように構成することが好ましい。   And it can comprise so that temperature sensor S1, S2 may be provided in the both ends of the bearing 1, and the cooling control part 25 may increase / decrease the supply amount of a cooling water based on the difference value of both temperature sensor S1, S2. In this case, it is preferable that the cooling water supplied to each bearing 1 and drained from the drainage channel 32 is returned to the water supply tank 22 and circulated.

つまり、軸受1の両端部に揚水の浸入を防止するシール機構33が設けられ、シール機構33の内側一端から冷却水を供給し内側他端から排出する冷却管31,32が配置され、冷却機構20は温度センサS1,S2の値に基づいて前記冷却管への冷却水の供給量を調整するように構成される。   That is, the seal mechanism 33 for preventing the intrusion of pumped water is provided at both ends of the bearing 1, and the cooling pipes 31 and 32 for supplying cooling water from one inner end of the seal mechanism 33 and discharging from the other inner end are arranged. 20 is configured to adjust the supply amount of the cooling water to the cooling pipe based on the values of the temperature sensors S1 and S2.

尚、各軸受1に、冷却水の温度を検知する単一の温度センサS1を備える場合には、環境温度との差分値に基づいて冷却水の供給量を制御することが好ましい。   In addition, when each bearing 1 is provided with the single temperature sensor S1 which detects the temperature of a cooling water, it is preferable to control the supply amount of a cooling water based on a difference value with environmental temperature.

冷却機構20に備えた冷却制御部25は、温度センサSの値が所定の異常温度を示すと、外部に異常信号を出力するように構成されていることが好ましい。   The cooling control unit 25 provided in the cooling mechanism 20 is preferably configured to output an abnormal signal to the outside when the value of the temperature sensor S indicates a predetermined abnormal temperature.

温度センサの値に基づいて、軸受の温度が高く、耐熱温度に達する虞があると把握されるような場合に、冷却制御部25から出力される異常信号に基づいて、立軸ポンプ装置Pを自動または手動停止する等の適切な対応を採ることができるようになる。   The vertical shaft pump device P is automatically operated based on an abnormal signal output from the cooling control unit 25 when it is understood that the bearing temperature is high and there is a risk of reaching the heat-resistant temperature based on the value of the temperature sensor. Alternatively, it is possible to take appropriate measures such as manually stopping.

上述した実施形態では、温度センサSで冷却水の温度を測定する構成を説明したが、図5に示すように、温度センサSで軸受1本体の温度を測定するように構成してもよい。この場合、摺動部であるゴム部分1aを測定点にしてもよいが、長時間運転を考えると、変形や磨耗の影響を受けないようにゴムの外周を保持するバックメタル1bの温度を測定するのが好ましい。   In the embodiment described above, the configuration in which the temperature of the cooling water is measured by the temperature sensor S has been described. However, the temperature sensor S may be configured to measure the temperature of the main body of the bearing 1 as shown in FIG. In this case, although the rubber part 1a which is a sliding part may be used as a measurement point, the temperature of the back metal 1b which holds the outer periphery of the rubber is measured so as not to be affected by deformation or wear in consideration of long-time operation. It is preferable to do this.

上述した実施形態では、立軸ポンプ装置の例として斜流ポンプを用いた例を説明したが、本発明の立軸ポンプ装置は、斜流ポンプ以外に軸流ポンプや遠心ポンプにも適用可能である。   In the embodiment described above, an example using a mixed flow pump as an example of the vertical pump device has been described, but the vertical pump device of the present invention can be applied to an axial flow pump and a centrifugal pump in addition to the mixed flow pump.

上述した実施形態では軸受がゴム軸受である場合を説明したが、ゴム軸受以外に樹脂軸受である場合も本発明を適用することができる。   In the embodiment described above, the case where the bearing is a rubber bearing has been described, but the present invention can also be applied to a case where the bearing is a resin bearing in addition to the rubber bearing.

上述した実施形態では、給水ポンプで冷却水を供給する構成を説明したが、高架水槽からバルブを介して供給する等、冷却水の供給量が制御できる態様であればどのような給水構成であってもよい。   In the above-described embodiment, the configuration in which the cooling water is supplied by the water supply pump has been described. However, any water supply configuration may be used as long as the supply amount of the cooling water can be controlled, such as supply from the elevated water tank via a valve. May be.

以上の説明は、本発明の一実施形態であり、各記載により本発明の範囲が限定されるものではなく、各部の具体的な形状、材料、大きさ等は本発明の作用効果が奏される範囲で適宜変更設計可能である。   The above description is one embodiment of the present invention, and the scope of the present invention is not limited by each description. The specific shape, material, size, and the like of each part have the effects of the present invention. The design can be changed as appropriate within a range.

1:軸受
2:主軸
3:羽根車
6:揚水管
20:冷却機構
25:冷却制御部
P:立軸ポンプ装置
S、S1,S2:温度センサ

1: Bearing 2: Main shaft 3: Impeller 6: Pump pipe 20: Cooling mechanism 25: Cooling control unit P: Vertical shaft pump device S, S1, S2: Temperature sensor

Claims (5)

下端部に羽根車が取り付けられた主軸が、鉛直姿勢の揚水管に軸受を介して回転可能に支持され、前記軸受に冷却水を供給する冷却機構が設けられている立軸ポンプ装置であって、
前記軸受の下部に設けられた軸封装置と前記軸受とが水密に連結された保護管で前記主軸が被覆されるとともに、前記軸受に流入する冷却水の流入温度及び前記軸受から流出する冷却水の流出温度を検知する温度センサが設けられ、
前記冷却機構は吸水タンクと吸水ポンプを含み、両温度の差分値に基づいて前記吸水ポンプにより前記吸水タンクに貯水された冷却水の前記保護管への供給量が可変に調整されるように構成されている立軸ポンプ装置。
A main shaft having an impeller attached to a lower end portion thereof is rotatably supported by a vertical lifting water pump via a bearing, and is a vertical shaft pump device provided with a cooling mechanism for supplying cooling water to the bearing,
The main shaft is covered with a protective tube in which a shaft seal device provided at a lower portion of the bearing and the bearing are connected in a watertight manner, and an inflow temperature of cooling water flowing into the bearing and a cooling water flowing out of the bearing Temperature sensor to detect the outflow temperature of
The cooling mechanism includes a water absorption tank and a water absorption pump, and is configured to variably adjust the supply amount of the cooling water stored in the water absorption tank by the water absorption pump based on a difference value between both temperatures. has been that vertical shaft pump apparatus.
下端部に羽根車が取り付けられた主軸が、鉛直姿勢の揚水管に軸受を介して回転可能に支持され、前記軸受に冷却水を供給する冷却機構が設けられている立軸ポンプ装置であって、
前記軸受の下部に設けられた軸封装置と前記軸受とが水密に連結された保護管で前記主軸が被覆されるとともに、前記軸受を流出する冷却水の温度及び所定の環境温度を検知する温度センサが設けられ、
前記冷却機構は吸水タンクと吸水ポンプを含み、両温度の差分値に基づいて前記吸水ポンプにより前記吸水タンクに貯水された冷却水の前記保護管への供給量が可変に調整されるように構成されている立軸ポンプ装置。
A main shaft having an impeller attached to a lower end portion thereof is rotatably supported by a vertical lifting water pump via a bearing, and is a vertical shaft pump device provided with a cooling mechanism for supplying cooling water to the bearing,
The main shaft is covered with a protective tube in which a shaft seal device provided at a lower portion of the bearing and the bearing are connected in a watertight manner, and a temperature for detecting a temperature of cooling water flowing out of the bearing and a predetermined environmental temperature is detected. A sensor is provided,
The cooling mechanism includes a water absorption tank and a water absorption pump, and is configured to variably adjust the supply amount of the cooling water stored in the water absorption tank by the water absorption pump based on a difference value between both temperatures. has been that vertical shaft pump apparatus.
前記軸受は、ゴム軸受または樹脂軸受である請求項1または2記載の立軸ポンプ装置。The vertical shaft pump device according to claim 1 or 2, wherein the bearing is a rubber bearing or a resin bearing. 前記冷却水は、上水を含む良質の水が用いられる請求項1から3の何れかに記載の立軸ポンプ装置。The vertical shaft pump device according to any one of claims 1 to 3, wherein the cooling water is high-quality water including clean water. 前記給水ポンプを常時低速駆動し或いは間歇的に駆動して、前記保護管の下端側から冷却水を供給し、前記保護管に備えた上部軸封装置から冷却水が僅かに溢流する程度の微量を継続的に供給する冷却制御部を備えている請求項1から4の何れかに記載の立軸ポンプ装置。The water supply pump is always driven at a low speed or intermittently, cooling water is supplied from the lower end side of the protective tube, and the cooling water slightly overflows from the upper shaft seal device provided in the protective tube. The vertical shaft pump device according to any one of claims 1 to 4, further comprising a cooling control unit that continuously supplies a minute amount.
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