JP2016186261A - Lubrication system of vertical shaft pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lubrication system of a vertical shaft pump capable of continuing the utilization even when pumped water contains fine debris while protecting bearings, in a vertical shaft pump having bearings protected using part of the pumped water.SOLUTION: A lubrication system comprises: a lubrication water supply line configured to be able to supply part of pumped water of a vertical shaft pump to bearings that are rotatably supporting a main shaft as lubrication water; a first tank storing fresh water independently of the pumped water; a fresh water supply line that connects the first tank to the lubrication water supply line; a fresh water supply pump provided along the fresh water supply line; and a first valve provided on the upstream side of the confluence of the lubrication water supply line with the fresh water supply line.SELECTED DRAWING: Figure 2

Description

  The present disclosure relates to a lubrication system for a vertical shaft configured such that a main shaft extending in a vertical direction and provided with an impeller on a lower end side is rotatably supported by a casing via a bearing.

  As a kind of pump used for pumping fluid, a vertical shaft pump having a main shaft extending in a vertical direction is known. In the vertical shaft pump, fluid is pumped up by an impeller provided on the lower end side of the main shaft being rotated by a power source such as a motor.

  The main shaft of the vertical shaft pump is accommodated while being rotatably supported with respect to the casing by a bearing, for example. Such a bearing uses a fluid such as water for cooling and preventing wear and seizure. For example, Patent Document 1 discloses a configuration in which a vertical liquid pump is provided with a lubricating liquid circuit in which a lubricating liquid circulates independently of pumping water, and the lubricating liquid is supplied from the lubricating liquid circuit to a bearing. Patent Document 2 discloses that a rubber bearing is used as an example of a bearing for supporting a main shaft with a vertical shaft pump.

Japanese Patent No. 4709878 Sho 60-147597

  One of the uses of the vertical shaft pump is to pump seawater into the facility from a seawater pit that stores seawater taken from the seabed in the near sea in plant facilities established on the coast. For example, in a nuclear power plant, seawater drawn from a seawater pit is used as cooling water for various auxiliary machines. In this way, the seawater pumped up from the seawater pit may contain various foreign substances such as living things such as seafood and drifting objects such as driftwood. Therefore, these foreign substances are removed by providing a screen and strainer for removing foreign substances in the seawater pit and the water intake path. However, for example, when a tsunami strikes, fine sand may be contained in the seawater as compared with the above-mentioned foreign matter. Such fine foreign matter is not removed by the above-described screen or strainer, but is contained in the pumped water pumped into the plant equipment.

  In the vertical shaft pump of Patent Document 1, the bearing is lubricated by the lubricating liquid flowing in the lubricating liquid circuit independent of the pumped water, so that the influence of the tsunami attack is small. However, such a system is disadvantageous in that a cooling device for cooling the lubricating liquid heated by the bearing needs to be provided in the lubricating liquid circuit. On the other hand, in a vertical shaft pump that uses a part of the pumped water as a lubricating liquid for the bearing, it is not necessary to provide a cooler for cooling the lubricating liquid, but the pumped water contains fine foreign matter when the tsunami strikes. There is a problem that the bearing is damaged.

  At least one embodiment of the present invention has been made in view of the above-mentioned problems, and in a vertical shaft pump that uses a part of pumped water for lubricating a bearing that supports the main shaft, the bearing is protected from minute foreign matters contained in the pumped water. The object is to provide a lubrication system for possible vertical shaft pumps.

(1) In order to solve the above problems, a vertical shaft lubrication system according to at least one embodiment of the present invention has a main shaft extending in the vertical direction and provided with an impeller on the lower end side. A vertical shaft lubrication system configured to be rotatably supported, wherein a lubricating water supply line configured to be able to supply a part of the pumped water of the vertical shaft pump as lubricating water to the bearing, and independent of the pumped water A first tank in which fresh water is stored, a fresh water supply line connecting the first tank to the lubricating water supply line, a fresh water supply pump provided on the fresh water supply line, and a lubricating water supply line A first valve provided upstream of the junction with the fresh water supply line.

(2) In some embodiments, in the configuration of (1), a part of the pumped water is supplied as lubricating water to the bearing through the lubricating water supply line when the first valve is normal. The pumping operation is performed and the first valve is closed in the event of an abnormality, whereby the pumped water is blocked by the bearing, and the fresh water stored in the first tank is supplied to the bearing by the fresh water supply pump. Is closed.

  According to the above configuration (1) or (2), the bearing that supports the main shaft uses pumped water supplied from a lubricating water supply line as lubricating water when it is normal (when a non-tsunami strikes). On the other hand, when there is an abnormality (when a tsunami strikes), there is a possibility that fine foreign matter may be mixed into the pumped water, so that the pumping supply to the bearing is stopped by closing the first valve, and the fresh water supply pump As a result, fresh water stored in the first tank is supplied to the bearing as lubricating water. Thereby, a bearing can be protected by the fresh water which does not contain a foreign material also at the time of abnormality.

(3) In some embodiments, in the configuration of (1) or (2), the pumped water is pumped from a seawater pit in which seawater taken from the ocean is stored.

  According to the configuration of (3) above, in the seawater pit taking water from the seabed, fine foreign substances such as sand are contained in the stored seawater when the tsunami strikes. Even in such a case, by adopting the above configuration, the bearing can be protected even in an abnormal state.

(4) In some embodiments, in any one of the above configurations (1) to (3), one of the lubricating water supply lines is provided downstream of the first valve in the lubricating water supply lines. A second tank configured to be able to store lubricating water flowing through the circulation line is provided on the circulation line provided to bypass the section.

  According to the configuration of (4) above, by storing a part of the circulating water in the second tank provided on the circulation line, in addition to the fresh water stored in the first tank, More lubricating water that can be supplied can be secured. When the state where foreign matter is contained in the pumped water continues for a long period of time, it is assumed that only the clear water stored in the first tank as the lubricating water for the bearing is insufficient. However, it is possible to cope with this by using the lubricating water stored in the second tank together.

(5) In some embodiments, in any one of the configurations (1) to (4), the fresh water supply line is provided with at least one of a second valve and a check valve that can be opened and closed. Yes.

  According to the configuration of (5) above, by providing the second valve and the check valve on at least one of the second valve and the check valve on the fresh water supply line, the lubricating water supply line transfers the first tank to the first tank. It is possible to prevent the pumped water from flowing back and to ensure the quality of fresh water stored in the first tank.

(6) In some embodiments, in any one of the configurations (1) to (5), the lubricating water supply line includes a space provided between the main shaft and a protective tube surrounding the main shaft. Lubricating water is supplied to the bearing.

(7) In some embodiments, in any one of the configurations (1) to (6), when an abnormality is detected by the abnormality detection unit that detects abnormality of the lubricating water and the abnormality detection unit, The first valve is closed to shut off the supply of pumped water to the bearing, and the fresh water supply pump is driven to supply fresh water from the first tank to the bearing. And a control unit that automatically controls the valve and the fresh water supply pump.

  According to the configuration of (7) above, when the abnormality is detected by the abnormality detection unit, the first valve and the fresh water supply pump are automatically controlled to quickly lubricate the bearing against the occurrence of the abnormality. The water source can be switched.

(8) In some embodiments, in the configuration of (7), the apparatus further includes a flow rate detection unit that detects a flow rate of the lubricating water in the lubricating water supply line, and the control unit is detected by the flow rate detection unit. The first valve and the fresh water supply pump are automatically controlled so that the flow rate is a predetermined value.

  According to the configuration of (8) above, by controlling the first valve and the fresh water supply pump so that the flow rate of the lubricating water in the lubricating water supply line becomes a predetermined value, the work load on the worker when an abnormality occurs is reduced. Can be reduced.

  According to at least one embodiment of the present invention, in a vertical shaft pump that uses a part of pumped water for lubricating a bearing that supports a main shaft, a lubricating system for the vertical pump that can protect the bearing from minute foreign matters contained in the pumped water is provided. it can.

It is sectional drawing which shows typically the structure of the vertical shaft pump which concerns on at least 1 embodiment of this invention. It is a mimetic diagram showing the whole lubrication system composition concerning at least 1 embodiment of the present invention. It is a schematic diagram which shows one structural example for automatically controlling the lubrication system of FIG. It is a schematic diagram which shows the other structural example for automatically controlling the lubrication system of FIG.

Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described in the embodiments or shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative examples. Absent.
For example, expressions expressing relative or absolute arrangements such as “in a certain direction”, “along a certain direction”, “parallel”, “orthogonal”, “center”, “concentric” or “coaxial” are strictly In addition to such an arrangement, it is also possible to represent a state of relative displacement with an angle or a distance such that tolerance or the same function can be obtained.
In addition, for example, expressions representing shapes such as quadrangular shapes and cylindrical shapes not only represent shapes such as quadrangular shapes and cylindrical shapes in a strict geometric sense, but also within the range where the same effect can be obtained. A shape including a chamfered portion or the like is also expressed.
On the other hand, the expressions “comprising”, “comprising”, “comprising”, “including”, or “having” one constituent element are not exclusive expressions for excluding the existence of the other constituent elements.

  First, with reference to FIG. 1, the structure of the vertical pump 1 which is the lubrication object of the lubrication system which concerns on at least 1 embodiment of this invention is demonstrated. FIG. 1 is a cross-sectional view schematically showing a configuration of a vertical shaft pump 1 according to at least one embodiment of the present invention.

  The vertical shaft pump 1 is a pump device for pumping in-house water from a seawater pit in a plant facility constructed on the coast. The plant facility is, for example, a nuclear power plant, and the pumped water of the vertical shaft pump 1 is mainly used as cooling water (for example, auxiliary machine cooling water) for various devices in the plant facility. The vertical shaft pump 1 has a main shaft 2 extending in the vertical direction, and the main shaft 2 is rotatably supported by a casing 3.

The casing 3 includes a pumping pipe 4 through which pumped water flows, a pumping bowl 5 connected to the lower end of the pumping pipe 4, and a water absorption bell 6 connected to the lower end of the pumping bowl. Furthermore, the pumping pipe 4 includes a lower pumping pipe 4a, an intermediate pumping pipe 4b, and an upper pumping pipe 4c that are joined together. Most of the main shaft 2 is disposed inside the pumping pipe 4, but the upper end side is configured to protrude through the pumping pipe 4 (upper pumping pipe 4c). The lower pumping pipe 4 a and the intermediate pumping pipe 4 b have a straight pipe shape extending in the vertical direction along the main shaft 2. The upper pumping pipe 4c has an elbow shape that is curved so that the inlet side and the outlet side are substantially perpendicular to each other. The lower pumping pipe 4a, the intermediate pumping pipe 4b, and the upper pumping pipe 4c are assembled in a substantially J shape as a whole by joining their flange surfaces.
The lower pumping pipe 4a, the intermediate pumping pipe 4b, and the upper pumping pipe 4c are joined in a watertight manner by fastening them with bolts with a gasket or an O-ring interposed between the flange surfaces, for example. For known structures, follow known examples.

  An impeller (impeller) 7 is provided on the lower end side of the main shaft 2. The impeller 7 is arranged so as to correspond to the pumping bowl 5. A guide vane 8 is provided on the inner wall of the pumping bowl 5. The guide vane 8 is fixed to the lower end side of the protective tube 9 formed so as to surround the main shaft 2 (the upper end side of the protective tube 9 is fixed to the upper pumping pipe 4c through which the main shaft 2 passes). . The protective tube 9 is provided substantially coaxially with the main shaft 2, and a gap 15 through which circulating water flows is provided between the protective tube 9 and the main shaft 2.

  The main shaft 2 is rotatably supported by an upper bearing 10, a lower bearing 11 and an intermediate bearing 12 at three points, the upper end side, the lower end side and the middle thereof. Lubricating water supplied from a lubricating water supply line 20 described later is supplied to the upper bearing 10, the lower bearing 11, and the intermediate bearing 12 through a gap 15. That is, the upper bearing 10, the lower bearing 11, and the intermediate bearing 12 are sliding bearings that rotatably support the main shaft 2 by supplying lubricating water between the bearing surface and the main shaft 2.

  A pedestal 13 is provided above the upper pumping pipe 4c, and an electric motor 50 (see FIG. 2) as a power source of the main shaft 2 is disposed on the pedestal 13. The electric motor 50 is an electric motor driven by electric power supplied from a power source (not shown), and its output shaft is connected to the main shaft 2. When the main shaft 2 is rotated by the electric motor 50, the impeller 7 provided on the lower end side of the main shaft 2 rotates, and seawater stored in the seawater pit is taken in from the water absorption bell 6. The seawater taken in from the water absorption bell 6 passes through the pumping bowl 5 and is sent to the pumping pipe 4 and is finally discharged from the discharge port 17 as pumped water. As described above, the pumped water discharged from the discharge port 17 is mainly sent to the plant equipment side for use as cooling water for various equipment in the plant equipment, and a part thereof is related to one embodiment of the present invention. The lubricating water is supplied as a lubricating water to a gap 15 formed between the main shaft 2 and the protective tube 9 via a lubricating water supply line 20 constituting the lubricating system 100.

FIG. 2 is a schematic diagram showing an overall configuration of a lubrication system 100 according to at least one embodiment of the present invention.
The lubrication system 100 can lubricate the bearings 10, 11, and 12 by supplying a part of the pumped water discharged from the vertical shaft pump 1 having the above configuration to the gap 15 between the main shaft 2 and the protective tube 9 as lubricating water. It has a configured lubricating water supply line 20. The upstream side of the lubricating water supply line 20 is formed so as to branch from the discharge side of the upper pumping pipe 4c, and is configured to be able to take a part of the pumped water. A first valve 22 whose opening degree can be adjusted is provided on the lubricating water supply line 20. By adjusting the opening degree of the first valve 22, lubricating water is supplied from the lubricating water supply line 20 to each bearing. The supply / stop can be selected for the side.
A part of the lubricating water flowing through the lubricating supply line 20 can be supplied to the seawater system 23 via the strainers 21a and 21b.

Here, in order to ensure the reliability of the operation, a plurality of first valves 22 are respectively provided on the mutually parallel flow paths 24a and 24b formed by partly branching the lubricating water supply line 20. ing. A strainer 25a for removing foreign substances is provided in the flow path 24a, and first valves 22a and 22b are provided on the upstream side and the downstream side, respectively. A strainer 25b for removing foreign substances is provided in the flow path 24b, and first valves 22c and 22d are provided on the upstream side and the downstream side, respectively.
The strainers 25a and 25b have a rough mesh for removing relatively large foreign matters (at least foreign matters larger than fine foreign matters such as sand contained in pumped water when a tsunami strikes).

  During normal times (when a non-tsunami strikes), the first valves 22a and 22b are set in an open state and the first valves 22c and 22d are set in a closed state, and lubrication flowing through the lubricating water supply line 20 is performed. Water is supplied to the bearing side only through the flow path 24a. On the other hand, the route 24b is a backup used in accordance with the route 24a when a problem occurs on the route 24a. The circulating water that has passed through the first valve 22 is supplied to the space 15 of the vertical shaft pump 1 through the check valve 26 and lubricates the bearings 10, 11, and 12.

  The first tank 27 is a water storage means in which fresh water independent of the pumping of the vertical shaft pump 1 is stored, and is connected to the lubricating water supply line 20 via the fresh water supply line 28. Here, fresh water means a fluid that does not contain foreign substances to the extent that they do not cause damage such as wear or damage to the bearings 10, 11, 12 when foreign substances are introduced into the bearings 10, 11, 12. It does not matter whether it is fresh water or seawater. A fresh water supply pump 29 is provided on the fresh water supply line 28, and the fresh water stored in the first tank 27 is supplied to the lubricating water supply line 28 by driving the fresh water supply pump 29. Has been.

  The first valve 22 is provided on the upstream side of the junction 30 with the fresh water supply line 28 in the lubricating water supply line 20. As described above, a part of the pumped water supplied through the lubricating water supply line 20 in normal times is used as lubricating water. On the other hand, when there is an abnormality such as a tsunami attack, there is a possibility that fine foreign matter may be included in the pumped water, so that the supply of pumped water to the bearings 10, 11 and 12 is shut off by closing the first valve 22. The fresh water stored in the first tank 27 is supplied by the fresh water supply pump 29. As a result, fresh water is supplied to the lubricating water supply line 20 via the fresh water supply line 28, and the lubricating water supply to the bearing can be continued while protecting the bearing even in the event of an abnormality.

A circulation line 30 is provided on the lubricating water supply line 20 on the downstream side of the first valve 22 so as to bypass the lubricating water supply line 20. On the circulation line 30, the 2nd tank 32 comprised so that the lubricating water which flows through this circulation line 30 can be stored is provided. The lubricating water stored in the second tank 32 is configured to be appropriately supplied to the lubricating water supply line 20 via the check valve 31. For example, by storing in advance the lubricating water that is part of the pumped water in the second tank 32 before the tsunami strikes, the pumped water stored in the second tank 32 can be used as the lubricating water even during the tsunami strike. . As described above, the fresh water supplied from the first tank 27 is basically usable when the tsunami strikes, but the fresh water that can be stored in the first tank 27 is limited. By using the lubricating water stored in the tank 32, the operation of the vertical shaft pump 1 can be continued while protecting the bearings 10, 11, and 12 for a longer period of time.
The lubricating water stored in the second tank 32 may be used for bearing protection when the amount of pumped water is small, such as when the vertical shaft 1 is started, in addition to the time of the tsunami as described above. Good.

  The second tank 32 is provided with an external line 33. By opening and closing a valve 34 provided on the external line 33, the second tank 32 can be used for other purposes as necessary. Yes.

  In addition, an in-house water system 37 is connected to the circulation line 30 via a check valve 35 and a valve 36. The in-house water system 37 uses various kinds of water used in plant facilities, and is configured to take in-house water into the circulation line 30 by opening the valve 36 as necessary. Thereby, even if the situation where the lubricating water is still insufficient due to the water supply from the first tank 27 and the second tank 32, the bearings 10, 11, 12 are supplied by supplying water from the in-house water system 37. Operation of the vertical shaft pump 1 can be continued while protecting

  In the example of FIG. 2, a part of the lubricating water can be supplied as cooling water to the electric motor 50 that is a power source of the main shaft 2 via a line 38 branched from the circulation line 30. Since the lubricating water after cooling the electric motor 50 is heated by the amount of heat received from the electric motor 50, it is discharged to the outside through the valve 39.

As described above, in the present embodiment, when the tsunami strikes, lubricating water is supplied from the first tank 27, the second tank 32, and the in-house water system 37 so that the operation of the vertical pump continues while protecting the bearings. it can.
The above-described valve operation and pump operation operation may be performed manually by an operator at the time of the tsunami, but may be performed by automatic control as described below.

  FIG. 3 is a schematic diagram showing one configuration example for automatically controlling the lubrication system 100 of FIG. The lubrication system 100 includes a control device 60 that is a control unit including an arithmetic device such as a microprocessor. The control device 60 is configured to be able to perform the following automatic control by installing a program stored in a storage device such as a memory or a hard disk (not shown).

  As shown in FIG. 3, the control device 60 includes an abnormality detection unit 62 that detects an abnormality, and a control unit that controls the first valve 22 and the fresh water supply pump 29 when an abnormality is detected by the abnormality detection unit 62. 64. The abnormality detection unit 62 detects a situation (that is, a tsunami attack) in which fine foreign matter is contained in the pumped water supplied as lubricating water to the bearing at the normal time. Here, the abnormality may include a state in which a tsunami attack is expected as a possibility in addition to a state in which a tsunami attack has actually occurred. Specifically, for example, the abnormality detection unit 62 may detect a tsunami attack predictively by acquiring a tsunami warning or a tsunami warning, or may be a seawater pit or seawater from which pumped water is pumped. A tsunami attack may be detected on the basis of a monitoring result of a water quality sensor provided at a water intake of the pit.

  When an abnormality is detected by the abnormality detection unit 62, the control unit 64 performs automatic control by transmitting a control command to the first valve 22 and the fresh water supply pump 29. Specifically, as described above, the first valve 22 is closed and isolated from the bearings 10, 11, 12 so that the pumped water of the vertical shaft pump 1 is not supplied from the lubricating water supply line 20 to the bearings 10, 11, 12. At the same time, the fresh water supply pump 29 is controlled to operate.

  FIG. 4 is a schematic diagram showing another configuration example for automatically controlling the lubrication system of FIG. The lubrication system 100 includes a control device 70 that is a control unit including an arithmetic device such as a microprocessor. The control device 70 is configured to be able to perform the following automatic control by installing a program stored in a storage device such as a memory or a hard disk (not shown).

  The control device 70 controls the first valve 22 and the fresh water supply pump 29 based on the flow rate detecting unit 72 that detects the flow rate of the lubricating water in the lubricating water supply line 20 and the flow rate detected by the flow rate detecting unit 72. Part 74. The flow rate detection unit 72 detects the flow rate of the lubricating water supplied to the bearing based on the detection signal of the flow rate sensor 75 provided downstream of the junction 30 with the fresh water supply line 28 in the lubricating water supply line 20. To do. The control unit 74 determines a target flow rate necessary to lubricate the bearings 10, 11, and 12 in advance, and the first measurement value is set so that the actual measurement value detected by the flow rate detection unit 72 becomes the target flow rate when a tsunami strikes. The valve 22 and the fresh water supply pump 29 are controlled. Thereby, the fresh water supplied from a 1st tank at the time of a tsunami attack can be controlled to a suitable flow volume. In the present embodiment, by automatically carrying out such control, it is possible to reduce the burden on the worker at the time of the tsunami attack and to construct a system having excellent reliability.

  The present disclosure can be used for a vertical shaft lubrication system in which a main shaft extending in a vertical direction and provided with an impeller on a lower end side thereof is rotatably supported by a casing via a bearing.

DESCRIPTION OF SYMBOLS 1 Vertical shaft pump 2 Main shaft 3 Casing 4 Pumping pipe 5 Pumping bowl 6 Water absorption bell 7 Impeller (impeller)
8 Guide vane 10 Upper bearing 11 Lower bearing 12 Intermediate bearing 13 Base 20 Lubricating water supply line 21 Strainer 22 First valve 23 Seawater system 25 Strainer 27 First tank 28 Fresh water supply line 29 Fresh water supply pump 30 Circulation line 32 Second Tank 35 Check valve 36 Valve 37 In-house water system 39 Valve 50 Electric motor 60 Controller 62 Abnormality detector 64 Controller 70 Controller 72 Flow detector 74 Controller 75 Flow sensor 100 Lubrication system

Claims (8)

A vertical shaft lubrication system configured such that a main shaft extending in a vertical direction and provided with an impeller on a lower end side is rotatably supported by a casing via a bearing,
A lubricating water supply line configured to supply a part of the pumped water of the vertical shaft pump as lubricating water to the bearing;
A first tank in which fresh water independent of the pumped water is stored;
A fresh water supply line connecting the first tank to the lubricating water supply line;
A fresh water supply pump provided on the fresh water supply line;
A first valve provided on the upstream side of the junction with the fresh water supply line of the lubricating water supply line;
A vertical pump lubrication system comprising:   The first valve is opened so that a part of the pumped water is supplied as lubricating water to the bearing via the lubricating water supply line in a normal state, and the first valve is closed in an abnormal state. The said pumping is shut off by the said bearing so that the said fresh water stored by the said 1st tank may be supplied to the said bearing by the said fresh water supply pump. Vertical shaft pump lubrication system.   The vertical pump lubrication system according to claim 1 or 2, wherein the pumped water is pumped up from a seawater pit in which seawater taken from the ocean is stored.   On the downstream side of the first valve in the lubricating water supply line, the lubricating water flowing through the circulation line can be stored on a circulation line provided so as to bypass a part of the lubricating water supply line. 4. The vertical pump lubrication system according to claim 1, wherein a configured second tank is provided. 5.   The vertical system lubrication system according to any one of claims 1 to 4, wherein the fresh water supply line is provided with at least one of a second valve and a check valve that can be opened and closed.   The said lubricating water supply line supplies lubricating water to the said bearing via the space provided between the said main axis | shaft and the protective pipe surrounding this main axis | shaft, The any one of Claim 1 to 5 characterized by the above-mentioned. Lubricating system for vertical shaft as described in 1. An abnormality detection unit for detecting an abnormality of the lubricating water;
When an abnormality is detected by the abnormality detection unit, the first valve is closed to shut off the pumped water supply to the bearing, and the fresh water supply pump is driven to drive the bearing from the first tank. A controller for controlling the first valve and the fresh water supply pump so as to supply fresh water to
The vertical pump lubrication system according to any one of claims 1 to 6, further comprising: A flow rate detector for detecting the flow rate of the lubricating water in the lubricating water supply line;
The vertical axis according to claim 7, wherein the control unit automatically controls the first valve and the fresh water supply pump so that a flow rate detected by the flow rate detection unit becomes a predetermined value. Pump lubrication system.

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