WO2018173769A1 - Multi-stage pump - Google Patents
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- WO2018173769A1 WO2018173769A1 PCT/JP2018/008947 JP2018008947W WO2018173769A1 WO 2018173769 A1 WO2018173769 A1 WO 2018173769A1 JP 2018008947 W JP2018008947 W JP 2018008947W WO 2018173769 A1 WO2018173769 A1 WO 2018173769A1
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- the present invention relates to a multi-stage pump for transferring liquid, and more particularly to a multi-stage pump that can be used as a feed water pump that pressurizes high-temperature and high-pressure water and transfers it to a boiler.
- FIG. 15 is a schematic diagram showing a power generation system using a steam turbine.
- Water such as industrial water or pure water is supplied to the tank 200 and sent to the deaerator 205 by the pump 201.
- the deaerator 205 is a device for removing dissolved oxygen from water, and is provided to prevent rusting of the boiler 211 and piping disposed downstream. Water is heated to a high temperature of 140 to 150 ° C. in the deaerator 205, and high-temperature and high-pressure water is generated in the deaerator 205.
- the deaerator 205 is disposed at a position higher than the water supply pump 208, and the deaerator 205 and the water pump 208 are connected by a suction pipe 206.
- the high-temperature and high-pressure water in the deaerator 205 is sucked into the feed water pump 208 through the suction pipe 206, pressurized by the feed water pump 208, and sent to the boiler 211.
- the high-temperature and high-pressure water is further heated to 200 to 300 ° C. in the boiler 211, and steam is generated.
- the steam rotates the steam turbine 212 and rotates the generator 214 connected to the steam turbine 212.
- a part of the steam exiting the steam turbine 212 is transferred to the deaerator 205, and the inside of the deaerator 205 is maintained at a high pressure.
- the remaining steam is condensed in the condenser 215 to become water.
- the condensed water is transferred to the tank 200 by the pump 216.
- the steam turbine 212 is rotated by the steam, and the generator 214 connected to the steam turbine 212 generates power.
- the present invention has been made to solve such a problem, and an object of the present invention is to provide a multistage pump that can prevent damage to a seal ring of a mechanical seal.
- the present inventor conducted experiments to find out the cause of damage to the seal ring of the mechanical seal, and found the following reason.
- the water in the deaerator 205 shown in FIG. 15 is heated to a high temperature in order to remove dissolved oxygen from the water, and the deaerator 205 has a high pressure in order to maintain the water in a liquid state.
- the reason for maintaining the water in a liquid state is to allow the water supply pump 208 to send water to the boiler 211.
- the water in the deaerator 205 is heated to 427 kPa at 145 ° C.
- the deaerator 205 is arranged at a position that is several tens of meters higher than the water supply pump 208.
- the pressure applied to the water present in the suction pipe 206 is the sum of the pressure in the deaerator 205 and the water head pressure. During normal operation, the pressure applied to the water present in the suction pipe 206 is higher than the water vapor pressure. Therefore, as shown in FIG. 1A, the water in the suction pipe 206 is sucked into the water supply pump 208 in a liquid state.
- the water supply pump 208 made up of a multi-stage pump has a balance mechanism for canceling the thrust force acting on the impeller from the pressurized water.
- the shock wave generated when the bubbles are crushed propagates through the balance pipe (see reference numeral 208a in FIG. 15) constituting a part of the balance mechanism, and finally reaches the mechanical seal. For this reason, the seal ring of the mechanical seal is broken by the shock wave.
- the inventor has found through experiments that cavitation occurs due to a pressure drop in the deaerator 205 and a shock wave generated when bubbles are crushed damages the seal ring of the mechanical seal.
- the pressure drop in the deaerator 205 is mainly caused by a drop in steam pressure generated by the boiler 211. Therefore, stabilizing the operation of the boiler 211 is one solution.
- the cause of the pressure drop in the boiler 211 includes various causes such as unstable fuel supply and tripping of the steam turbine 212, and it is difficult to maintain stable operation of the boiler 211.
- the following multistage pump capable of preventing the seal ring of the mechanical seal from being damaged.
- a multi-stage pump is provided that includes a pressure relief valve connected to one of piping and a seal chamber of the mechanical seal.
- a main shaft a plurality of impellers fixed to the main shaft, a casing containing the plurality of impellers and having a suction port and a discharge port, and a plurality of impellers from a liquid
- a balance mechanism for canceling a thrust force applied to the main shaft a mechanical seal that seals a gap between the main shaft and the casing, a suction pipe connected to the suction port, and a connection to the suction pipe
- a multi-stage pump with a pressure relief valve is provided.
- the balance piping of the balance mechanism includes a balance chamber of the balance mechanism and a flow path between the first stage impeller and the second stage impeller of the plurality of stages of impellers. Connecting. In one aspect, the balance piping of the balance mechanism includes a balance chamber of the balance mechanism and a flow path between the second stage impeller and the third stage impeller of the plurality of stage impellers. Connecting.
- the multistage pump further includes a check valve attached to a balance pipe of the balance mechanism, and the check valve allows liquid to pass only from the balance chamber to the suction side of the multistage pump. Configured to do.
- the multi-stage pump can be driven so that the rotational speed of the main shaft is gradually increased by an inverter when the multi-stage pump is activated.
- the multistage pump is a pump that pumps a liquid for flowing through a reverse osmosis membrane provided on the discharge side of the multistage pump.
- the multistage pump further includes an operation detection sensor that is connected to a discharge port of the pressure relief valve and detects that the pressure relief valve is activated.
- a water hammer preventing device that absorbs shock waves is provided instead of the pressure relief valve.
- the water hammer prevention device is formed between a flexible inner tube having a liquid passage formed therein, a flexible outer tube surrounding the inner tube, and the inner tube and the outer tube. And a flexible joint.
- the water hammer prevention device is a buffer tank including a container in which a damping device that absorbs shock waves is disposed.
- the pressure of the liquid raised by the shock wave is released by the pressure relief valve. Therefore, the shock wave does not reach the mechanical seal, and as a result, damage to the seal ring of the mechanical seal can be prevented.
- FIG. 1 It is a schematic diagram which shows a mode that water flows in a liquid state. It is a schematic diagram which shows a mode that cavitation generate
- FIG. 2 is a diagram showing an embodiment of a multistage pump.
- the multistage pump of this embodiment is suitable for use as the feed water pump 208 of the power generation system shown in FIG.
- the multistage pump includes a main shaft 1, a plurality of impellers 3a to 3j fixed to the main shaft 1, a casing 2 that houses the impellers 3a to 3j, and the impellers 3a to 3 of each step.
- a plurality of guide vanes 5 arranged on the discharge side of 3j are provided.
- each impeller 3a to 3j is a single suction centrifugal impeller.
- the impellers 3a to 3j are arranged on the main shaft 1 in the same direction.
- the impellers 3a to 3j may be simply referred to as the impeller 3 in some cases.
- ten impellers 3 are arranged, but the number of impellers 3 is not limited to this embodiment.
- the casing 2 has a suction casing 2A having a suction port 2a, a plurality of intermediate casings 2B each housing a plurality of stages of impellers 3a to 3i, and a discharge port 2c, which discharges a final stage impeller 3j. And a casing 2C.
- the intermediate casing 2B is disposed between the suction casing 2A and the discharge casing 2C.
- the suction casing 2A, the intermediate casing 2B, and the discharge casing 2C are fixed to each other by a through bolt 51 and a nut 52.
- the main shaft 1 passes through the suction casing 2A, the intermediate casing 2B, and the discharge casing 2C.
- the main shaft 1 is rotatably supported by bearings 8 and 9.
- One end of the main shaft 1 is connected to a driving source (not shown) such as an electric motor, and the main shaft 1 and the impeller 3 are rotated together by the driving source.
- a driving source such as an electric motor
- the impeller 3 rotates, the liquid flows into the impeller 3a through the suction port 2a, and velocity energy is given to the liquid by the rotation of the impeller 3a.
- the accelerated liquid exits the impeller 3a, flows along the guide vane 5, and flows into the next stage impeller 3b.
- the velocity energy of the liquid is converted into pressure, and the liquid is pressurized. In this manner, the liquid is sequentially pressurized by the plurality of stages of impellers 3 and the plurality of stages of guide vanes 5 and finally discharged from the discharge port 2c.
- the multistage pump includes a balance mechanism 11 that can cancel such a thrust force. Furthermore, the multistage pump includes mechanical seals 31 and 32 as shaft seal devices for sealing a gap between the casing 2 and the main shaft 1. The mechanical seals 31 and 32 are installed on the suction side and the discharge side of the casing 2. The discharge-side mechanical seal 32 is disposed on the counter-suction side of the balance mechanism 11.
- a stuffing box 33 is connected to the suction casing 2A, and a stuffing box 34 is connected to the discharge casing 2C.
- the mechanical seals 31 and 32 are disposed in the stuffing box 33 and the stuffing box 34, respectively.
- FIG. 3 is an enlarged sectional view showing the balance mechanism 11 shown in FIG.
- the balance mechanism 11 includes a balance sheet 12 fixed to the discharge casing 2C, a balance disk 15 fixed to the main shaft 1, a balance chamber 16 surrounding the balance sheet 12 and the balance disk 15, and suction of the balance chamber 16 and the multistage pump. And a balance pipe 18 communicating with the side.
- the balance sheet 12, the balance disk 15, and the balance chamber 16 are located in the discharge casing 2C.
- the balance sheet 12 is stationary, while the balance disk 15 is rotatable integrally with the main shaft 1.
- the inner surface of the balance disk 15 faces the outer surface of the balance sheet 12, and a small axial gap ⁇ exists between the inner surface of the balance disk 15 and the outer surface of the balance sheet 12.
- Recesses facing each other are formed on the inner surface of the balance disk 15 and the outer surface of the balance sheet 12, respectively, and an intermediate pressure chamber 20 is formed between the balance disk 15 and the balance sheet 12 by these recesses.
- the balance disc 15 has a first cylindrical portion 15a surrounding the main shaft 1, and the balance sheet 12 has a second cylindrical portion 12a surrounding the first cylindrical portion 15a.
- a minute radial gap ⁇ exists between the outer peripheral surface of the first cylindrical portion 15a and the inner peripheral surface of the second cylindrical portion 12a. This gap ⁇ communicates with the intermediate pressure chamber 20.
- the first cylindrical portion 15 a and the second cylindrical portion 12 a are located between the final stage impeller 3 j and the intermediate pressure chamber 20.
- One end of the balance pipe 18 is connected to the balance chamber 16, and the other end of the balance pipe 18 is connected to a flow path between the first stage impeller 3a and the second stage impeller 3b (see FIG. 2). ).
- the pressure in the balance chamber 16 is a pressure corresponding to the sum of the pressure of the liquid between the first stage impeller 3 a and the second stage impeller 3 b and the pressure loss in the balance pipe 18.
- one end of the balance pipe 18 is connected to the balance chamber 16, and the other end of the balance pipe 18 is connected to a flow path between the second stage impeller 3b and the third stage impeller 3c. Also good.
- the operation of the balance mechanism 11 is as follows. A part of the liquid exiting the final stage impeller 3j flows on the back side of the impeller 3j and reaches the gap ⁇ . Further, the liquid fills the intermediate pressure chamber 20 through the gap ⁇ and flows out into the balance chamber 16 through the gap ⁇ . The liquid in the balance chamber 16 passes through the balance pipe 18 and flows between the first stage impeller 3a and the second stage impeller 3b (or the second stage impeller 3b and the third stage impeller. It is returned to the flow path between the vehicle 3c).
- a pressure relief valve 22 is connected to the balance chamber 16 through a communication pipe 21.
- the pressure relief valve 22 opens when the pressure in the balance chamber 16 is higher than the set value, discharges the liquid in the balance chamber 16, and closes when the pressure in the balance chamber 16 is lower than the set value. It is configured.
- Such a pressure relief valve 22 is also called a safety valve and can be obtained on the market.
- the shock wave propagates the liquid in the balance pipe 18 and reaches the balance chamber 16 to increase the pressure of the liquid in the balance chamber 16.
- the pressure relief valve 22 is opened, and the liquid is discharged out of the balance chamber 16 through the pressure relief valve 22.
- the pressure relief valve 22 communicating with the balance chamber 16 can prevent the pressure in the balance chamber 16 from increasing when a water hammer occurs.
- the pressure relief valve 22 can prevent the mechanical seal 32 described below from being damaged.
- FIG. 4 is an enlarged cross-sectional view showing a mechanical seal 32 on the discharge side.
- the mechanical seal 32 includes a seal ring (fixed side ring) 35 supported by a stuffing box 34, a rotation side ring 36 that can rotate together with the main shaft 1, and the seal ring 35 as a rotation side ring 36. And a spring 37 to be pressed.
- the rotation side ring 36 is also called a mating ring.
- a shaft sleeve 40 is fixed to the outer peripheral surface of the main shaft 1, and a ring holder 41 is fixed to the outer peripheral surface of the shaft sleeve 40.
- the rotation side ring 36 is fixed to a ring holder 41, and the rotation side ring 36 and the ring holder 41 rotate integrally with the main shaft 1. As the main shaft 1 rotates, the rotation-side ring 36 comes into sliding contact with the seal ring 35.
- the seal ring 35 and the rotation side ring 36 are made of silicon carbide.
- a seal chamber 43 is formed between the shaft sleeve 40 and the inner surface of the stuffing box 34.
- the seal ring 35 and the rotation side ring 36 face the seal chamber 43.
- the liquid flows from the balance chamber 16 (see FIG. 3) of the balance mechanism 11 toward the mechanical seal 32 and flows into the seal chamber 43. Since the seal ring 35 is pressed against the rotation side ring 36 by the spring 37, only a very small gap exists between the seal ring 35 and the rotation side ring 36. Therefore, leakage of the liquid that has reached the mechanical seal 32 is substantially prevented by the mechanical seal 32.
- the mechanical seals 31 and 32 of the present embodiment are so-called dead end type mechanical seals that do not have a water injection pipe for cooling the mechanical seals 31 and 32.
- FIG. 5 is a side view of the multistage pump provided with the pressure relief valve 22, and FIG. 6 is a rear view of the multistage pump shown in FIG.
- the balance pipe 18 is schematically drawn.
- the above-described pressure relief valve 22 is connected to the discharge casing 2 ⁇ / b> C through a communication pipe 21.
- the shock wave propagates the liquid in the balance pipe 18 and reaches the balance chamber 16 to increase the pressure of the liquid.
- the pressure of the liquid is released out of the balance chamber 16 through the pressure relief valve 22. Therefore, the mechanical seal 32 shown in FIG. 4 can be prevented from being damaged, particularly the seal ring 35.
- the pressure relief valve 22 of the present embodiment can prevent not only the pressure increase caused by the water hammer but also the pressure increase due to other causes, and can prevent the mechanical seal 32 from being damaged.
- the pressure relief valve 22 is connected to the balance chamber 16, but if the water hammer is generated between the discharge side mechanical seal 32, the pressure relief valve 22 is connected.
- the position is not particularly limited.
- the pressure relief valve 22 is connected to the suction port 2a of the casing 2, the balance piping 18 of the balance mechanism 11, the seal chamber 43 of the mechanical seal 32, or the suction piping 206 (see FIG. 15) connected to the suction port 2a. Also good.
- FIG. 7 is a view showing an embodiment of a multistage pump including a pressure relief valve 22 connected to the suction port 2 a of the casing 2
- FIG. 8 includes a pressure relief valve 22 connected to the balance pipe 18.
- FIG. 9 is a diagram showing an embodiment of a multistage pump including a pressure relief valve 22 connected to the seal chamber 43 of the mechanical seal 32
- FIG. FIG. 3 is a view showing an embodiment of a multistage pump including a pressure relief valve 22 connected to a suction pipe 206.
- the suction pipe 206 is schematically drawn.
- the pressure relief valve 22 is preferably connected to the suction pipe 206 at a position close to the suction port 2a.
- the pressure relief valve 22 can prevent not only the pressure increase due to the water hammer but also the pressure increase due to other causes, and prevents the mechanical seal 32 from being damaged. be able to.
- FIG. 11 is a view showing an embodiment in which a check valve 60 is attached to the balance pipe 18 of the embodiment shown in FIG.
- the check valve 60 is a valve through which liquid can flow only from the balance chamber 16 toward the liquid suction side.
- the check valve 60 is a valve that allows only the liquid in the balance chamber 16 to flow through the balance pipe 18 to the suction side of the multistage pump.
- the pressure loss of the check valve 60 leads to an increase in the pressure in the balance chamber 16.
- the increase in the pressure in the balance chamber 16 may cause the distance between the balance disk 15 and the balance sheet 12 to be narrowed and contact with each other. Therefore, as the check valve 60, a valve that does not become a resistance against the pressure and flow rate of the balance chamber 16 during operation of the multistage pump is selected.
- the multistage pump of the present embodiment a simple structure that can suppress the contact between the balance disk 15 and the balance sheet 12 can be realized. That is, when water is passed into the multistage pump by another pump while the multistage pump is stopped, the pressure on the suction side is reduced by the pipe resistance of the multistage impeller 2 when passing through the inside of the multistage pump, The reduced pressure is applied to the balance chamber 16. On the other hand, paying attention to the flow of the liquid through the balance pipe 18, the check valve 60 prevents the liquid from flowing from the suction side of the multistage pump through the balance pipe 18 to the balance chamber 16. As a result, since only the thrust force in the anti-suction side direction is applied to the balance disk 15, it is possible to prevent the balance disk 15 and the balance sheet 12 from contacting each other.
- the check valve 60 shown in FIG. 11 can be applied not only to the embodiment shown in FIG. 2 but also to the embodiments shown in FIG. 7, FIG. 8, FIG.
- the pressure relief valve 22 is disposed between the balance chamber 16 and the check valve 60.
- FIG. 12 is a view showing an embodiment in which an electric motor 55 is connected to the multistage pump shown in FIG.
- the main shaft 1 of the multistage pump is connected to a drive shaft 55 a of the electric motor 55 by a coupling 56.
- the multistage pump is driven by an electric motor 55.
- An inverter 57 is electrically connected to the electric motor 55, and electric power is supplied to the electric motor 55 via the inverter 57.
- the electric motor 55 is driven at a variable speed by an inverter 57.
- the multi-stage pump of the present embodiment can be driven using the inverter 57 so that the rotational speed gradually increases and the discharge pressure gradually increases when the multi-stage pump is activated.
- the check valve 60 remains closed because the pressure in the balance chamber 16 is lower than the pressure on the suction side of the multi-stage pump. . That is, the movement of the liquid via the balance pipe 18 is restricted between the balance chamber 16 and the suction side of the multistage pump. While the check valve 60 is closed, no thrust in the suction side direction is applied to the balance disk 15, but only thrust in the anti-suction side direction is applied. Therefore, contact between the rotating balance disk 15 and the stationary balance sheet 12 can be suppressed.
- the pressure on the discharge side rises and the pressure in the balance chamber 16 becomes higher than the pressure on the suction side of the multistage pump.
- the check valve 60 is opened, and the balance chamber 16 and the suction side of the multistage pump are communicated by the balance pipe 18.
- the pressure in the balance chamber 16 and the pressure on the suction side of the multistage pump are substantially the same, and the main shaft 1 can be balanced.
- FIG. 13 is a view showing an embodiment in which an operation detection sensor 70 for detecting that the pressure relief valve 22 is operated is provided.
- the operation detection sensor 70 is connected to the discharge port of the pressure relief valve 22 and is configured to detect that the pressure relief valve 22 is activated. Examples of such an operation detection sensor 70 include a pressure sensor and a water leak detector.
- the operation detection sensor 70 is configured to generate a detection signal when detecting that the pressure relief valve 22 is operated.
- the operation detection sensor 70 shown in FIG. 13 can be applied not only to the embodiment shown in FIG. 2 but also to the embodiments shown in FIGS. 7, 8, 9, 10, 11, and 12.
- FIG. 14 is a view showing an embodiment in which a water hammer preventing device 80 is provided in place of the pressure relief valve 22.
- a water hammer preventing device 80 is provided instead of the pressure relief valve 22 shown in FIG. 2.
- Examples of the water hammer preventing device 80 include a flexible joint and a buffer tank.
- the flexible joint includes a flexible inner tube having a liquid passage formed therein, a flexible outer tube surrounding the inner tube, and an air layer formed between the inner tube and the outer tube. .
- the shock wave is absorbed by the air layer.
- the buffer tank includes a container in which an attenuation device capable of absorbing shock waves is disposed.
- Such flexible joints and buffer tanks are commercially available.
- the water hammer preventing device 80 shown in FIG. 14 can be applied not only to the embodiment shown in FIG. 2 but also to the embodiments shown in FIGS. 7, 8, 9, 10, 11, and 12.
- the multi-stage pump of each embodiment described above is suitable for use as the feed pump 208 of the power generation system shown in FIG. 15, but the present invention is not limited to this application.
- the multistage pump of each embodiment mentioned above is used as a pump which pumps the fluid (seawater) for making a reverse osmosis (RO) membrane provided in the discharge side of a multistage pump flow in a seawater desalination system. be able to.
- the present invention can be used for a multi-stage pump for transferring a liquid, and in particular, can be used for a multi-stage pump that can be used as a feed water pump that pressurizes high-temperature high-pressure water and transfers it to a boiler.
Abstract
Description
一態様では、前記バランス機構のバランス配管は、前記バランス機構のバランス室と、前記複数段の羽根車のうちの2段目の羽根車と3段目の羽根車との間の流路とを接続する。 In one aspect, the balance piping of the balance mechanism includes a balance chamber of the balance mechanism and a flow path between the first stage impeller and the second stage impeller of the plurality of stages of impellers. Connecting.
In one aspect, the balance piping of the balance mechanism includes a balance chamber of the balance mechanism and a flow path between the second stage impeller and the third stage impeller of the plurality of stage impellers. Connecting.
一態様では、前記多段ポンプは、前記多段ポンプの起動時にインバータによって前記主軸の回転速度が徐々に上昇するように駆動可能である。
一態様では、前記多段ポンプは、前記多段ポンプの吐き出し側に設けられた逆浸透膜へ通流させるための液体を圧送するポンプである。
一態様では、前記多段ポンプは、前記圧力逃し弁の吐出口に接続され、前記圧力逃し弁が作動したことを検出する作動検出センサをさらに備える。 In one aspect, the multistage pump further includes a check valve attached to a balance pipe of the balance mechanism, and the check valve allows liquid to pass only from the balance chamber to the suction side of the multistage pump. Configured to do.
In one aspect, the multi-stage pump can be driven so that the rotational speed of the main shaft is gradually increased by an inverter when the multi-stage pump is activated.
In one aspect, the multistage pump is a pump that pumps a liquid for flowing through a reverse osmosis membrane provided on the discharge side of the multistage pump.
In one aspect, the multistage pump further includes an operation detection sensor that is connected to a discharge port of the pressure relief valve and detects that the pressure relief valve is activated.
一態様では、前記ウォーターハンマー防止装置は、液体の通路が内部に形成された柔軟な内管と、前記内管を囲む柔軟な外管と、前記内管と前記外管との間に形成されている空気層とを備えたフレキシブル継手である。
一態様では、前記ウォーターハンマー防止装置は、衝撃波を吸収する減衰装置が内部に配置された容器を備えたバッファタンクである。 In one aspect, a water hammer preventing device that absorbs shock waves is provided instead of the pressure relief valve.
In one aspect, the water hammer prevention device is formed between a flexible inner tube having a liquid passage formed therein, a flexible outer tube surrounding the inner tube, and the inner tube and the outer tube. And a flexible joint.
In one aspect, the water hammer prevention device is a buffer tank including a container in which a damping device that absorbs shock waves is disposed.
図2は、多段ポンプの一実施形態を示す図である。本実施形態の多段ポンプは、図15に示す発電システムの給水ポンプ208としての使用に適している。図2に示すように、多段ポンプは、主軸1と、主軸1に固定された複数段の羽根車3a~3jと、羽根車3a~3jを収容するケーシング2と、各段の羽根車3a~3jの吐出側に配置された複数段のガイドベーン5を備えている。本実施形態では、各羽根車3a~3jは片吸込型の遠心羽根車である。羽根車3a~3jは同じ方向を向いて主軸1上に配列されている。以下の説明では、羽根車3a~3jを総称して単に羽根車3という場合がある。本実施形態では、10枚の羽根車3が配置されているが、羽根車3の枚数は本実施形態に限定されない。 Embodiments of the present invention will be described below with reference to the drawings.
FIG. 2 is a diagram showing an embodiment of a multistage pump. The multistage pump of this embodiment is suitable for use as the
2 ケーシング
2A 吸込ケーシング
2B 中間ケーシング
2C 吐出ケーシング
3,3a~3j 羽根車
5 ガイドベーン
8,9 軸受
11 バランス機構
12 バランスシート
15 バランスディスク
16 バランス室
18 バランス配管
20 中間圧力室
21 連絡管
22 圧力逃し弁
31,32 メカニカルシール
33,34 スタッフィングボックス
35 シールリング(固定側リング)
36 回転側リング
37 ばね
40 軸スリーブ
41 リングホルダ
43 シール室
51 通しボルト
52 ナット
60 逆止弁
70 作動検出センサ
80 ウォーターハンマー防止装置 DESCRIPTION OF
36
Claims (11)
- 主軸と、
前記主軸に固定された複数段の羽根車と、
前記複数段の羽根車を収容し、吸込口および吐出口を有するケーシングと、
液体から前記複数段の羽根車に加えられるスラスト力をキャンセルするためのバランス機構と、
前記主軸と前記ケーシングとの間の隙間を封止するメカニカルシールと、
前記ケーシングの吸込口、前記バランス機構のバランス室、前記バランス機構のバランス配管、および前記メカニカルシールのシール室のうちのいずれかに接続された圧力逃し弁を備えた多段ポンプ。 The spindle,
A plurality of impellers fixed to the main shaft;
A casing that houses the multi-stage impeller and has a suction port and a discharge port
A balance mechanism for canceling the thrust force applied to the plurality of impellers from the liquid;
A mechanical seal that seals a gap between the main shaft and the casing;
A multi-stage pump comprising a pressure relief valve connected to any of the suction port of the casing, the balance chamber of the balance mechanism, the balance piping of the balance mechanism, and the seal chamber of the mechanical seal. - 主軸と、
前記主軸に固定された複数段の羽根車と、
前記複数段の羽根車を収容し、吸込口および吐出口を有するケーシングと、
液体から前記複数段の羽根車に加えられるスラスト力をキャンセルするためのバランス機構と、
前記主軸と前記ケーシングとの間の隙間を封止するメカニカルシールと、
前記吸込口に接続された吸込配管と、
前記吸込配管に接続された圧力逃し弁を備えた多段ポンプ。 The spindle,
A plurality of impellers fixed to the main shaft;
A casing that houses the multi-stage impeller and has a suction port and a discharge port
A balance mechanism for canceling the thrust force applied to the plurality of impellers from the liquid;
A mechanical seal that seals a gap between the main shaft and the casing;
A suction pipe connected to the suction port;
A multi-stage pump having a pressure relief valve connected to the suction pipe. - 前記バランス機構のバランス配管は、前記バランス機構のバランス室と、前記複数段の羽根車のうちの1段目の羽根車と2段目の羽根車との間の流路とを接続する請求項1または2に記載の多段ポンプ。 The balance piping of the balance mechanism connects a balance chamber of the balance mechanism and a flow path between a first stage impeller and a second stage impeller of the plurality of stages of impellers. The multistage pump according to 1 or 2.
- 前記バランス機構のバランス配管は、前記バランス機構のバランス室と、前記複数段の羽根車のうちの2段目の羽根車と3段目の羽根車との間の流路とを接続する請求項1または2に記載の多段ポンプ。 The balance piping of the balance mechanism connects a balance chamber of the balance mechanism and a flow path between a second stage impeller and a third stage impeller of the plurality of stages of impellers. The multistage pump according to 1 or 2.
- 前記バランス機構のバランス配管に取り付けられた逆止弁をさらに備え、
前記逆止弁は、前記バランス室から前記多段ポンプの吸込側へのみ液体が通れることを許容するように構成された請求項1または2に記載の多段ポンプ。 A check valve attached to the balance piping of the balance mechanism;
The multistage pump according to claim 1 or 2, wherein the check valve is configured to allow liquid to pass only from the balance chamber to the suction side of the multistage pump. - 前記多段ポンプは、前記多段ポンプの起動時にインバータによって前記主軸の回転速度が徐々に上昇するように駆動可能である請求項5に記載の多段ポンプ。 The multi-stage pump according to claim 5, wherein the multi-stage pump can be driven by an inverter so that a rotational speed of the main shaft is gradually increased when the multi-stage pump is started.
- 前記多段ポンプは、前記多段ポンプの吐き出し側に設けられた逆浸透膜へ通流させるための液体を圧送するポンプである請求項1または2に記載の多段ポンプ。 The multi-stage pump according to claim 1 or 2, wherein the multi-stage pump is a pump that pumps a liquid for flowing through a reverse osmosis membrane provided on the discharge side of the multi-stage pump.
- 前記圧力逃し弁の吐出口に接続され、前記圧力逃し弁が作動したことを検出する作動検出センサをさらに備えた請求項1または2に記載の多段ポンプ。 The multi-stage pump according to claim 1 or 2, further comprising an operation detection sensor connected to a discharge port of the pressure relief valve and detecting that the pressure relief valve is activated.
- 前記圧力逃し弁に代えて、衝撃波を吸収するウォーターハンマー防止装置を備えた請求項1または2に記載の多段ポンプ。 The multi-stage pump according to claim 1 or 2, further comprising a water hammer preventing device that absorbs shock waves instead of the pressure relief valve.
- 前記ウォーターハンマー防止装置は、液体の通路が内部に形成された柔軟な内管と、前記内管を囲む柔軟な外管と、前記内管と前記外管との間に形成されている空気層とを備えたフレキシブル継手である請求項9に記載の多段ポンプ。 The water hammer preventing device includes a flexible inner tube having a liquid passage formed therein, a flexible outer tube surrounding the inner tube, and an air layer formed between the inner tube and the outer tube. The multistage pump according to claim 9, wherein the multistage pump is a flexible joint.
- 前記ウォーターハンマー防止装置は、衝撃波を吸収する減衰装置が内部に配置された容器を備えたバッファタンクである請求項9に記載の多段ポンプ。 The multi-stage pump according to claim 9, wherein the water hammer preventing device is a buffer tank including a container in which a damping device for absorbing a shock wave is disposed.
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JP2019507525A JP7029440B2 (en) | 2017-03-23 | 2018-03-08 | Multi-stage pump |
CN201880018901.XA CN110431315A (en) | 2017-03-23 | 2018-03-08 | Multistage pump |
BR112019018927-0A BR112019018927B1 (en) | 2017-03-23 | 2018-03-08 | MULTI-STAGE PUMP TO DELIVER A LIQUID |
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CN109340120A (en) * | 2018-11-29 | 2019-02-15 | 长沙佳能通用泵业有限公司 | A kind of four volute chambers three outlet self-balancing multi-stage pump |
CN114893436A (en) * | 2022-06-13 | 2022-08-12 | 江苏亚梅泵业集团有限公司 | Self-balancing multistage pump shaft seal mechanical seal structure |
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BR112019018927A2 (en) | 2020-04-22 |
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JPWO2018173769A1 (en) | 2020-01-23 |
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