JP2022169194A - Vertical shaft pump and prior standby operation method of the same - Google Patents

Abstract

To provide a vertical shaft pump which supplies a liquid to a space between a bearing and a shaft sleeve during an initial operation to prevent the bearing and the shaft sleeve from operating in a dry state.SOLUTION: A vertical shaft pump includes: a submerged bearing member rotatably supporting a rotary shaft to which an impeller is attached; a liquid storage tank in which a lubricating liquid for the submerged bearing member is stored; a first liquid supply duct line having an inlet end part connected to the liquid storage tank; a second liquid supply duct line having an outlet end part which supplies the lubricating liquid to the submerged bearing member; and a flow rate limitation member which is provided between the first liquid supply duct line and the second liquid supply duct line so as to limit a flow rate of the lubricating liquid entering the second liquid supply duct line.SELECTED DRAWING: Figure 1

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical shaft pump for pumping liquids such as river water and waste water, and more particularly to a preceding standby operation type vertical shaft pump. The present invention further relates to a method for preceding standby operation of a vertical shaft pump.

An example of the background art will be described with respect to recent standby operation type vertical shaft pumps. In recent years, due to the progress of urbanization, the reduction of green areas and the expansion of concrete or asphalt road surfaces are progressing. As a result, the heat island phenomenon occurs, and localized torrential downpours called so-called guerrilla downpours frequently occur in urban areas. On a concrete or asphalted road surface, a large amount of localized rainfall is directly led to the waterway without being absorbed into the ground. As a result, a large amount of rainwater flows into the pumping station in a short period of time.

A large amount of rainwater brought by such frequent torrential rains needs to be quickly drained. Therefore, a vertical shaft pump installed at a drainage pump station is subjected to a preliminary standby operation in which the pump is started in advance before rainwater reaches the drainage pump station. As a result, it is possible to prevent flood damage due to delay in starting the pump. Specifically, in the preceding standby operation, the pump is operated from a low water level before the water level in the suction water tank reaches a level at which pumping operation can be performed. Therefore, until the water level in the suction water tank reaches the pumping level, the pump is operated without pumping (hereinafter referred to as "dry operation"). During this time, pumping water is not supplied to the bearing that supports the rotary shaft (in other words, the main shaft) of the pump and the shaft sleeve of the rotary shaft. That is, the bearing and shaft sleeve are kept dry.

During air operation of vertical shaft pumps, the bearings and shaft sleeves slide in the atmosphere under conditions of high friction. In particular, in the pre-standby operation, dry operation is performed before pumping is started and the bearings are lubricated with water. In order to enable the pump to operate in the air while the bearings remain dry, it is conceivable to use, for example, ceramic or resin for the underwater bearings and cemented carbide or thermal spray coating for the shaft sleeve. However, if the bearings and shaft sleeve are dry during operation of the pump, the high friction will increase the temperature of the bearings and may exceed the temperature limits of the bearings themselves or the materials surrounding the bearings. Also, it is necessary to use a special resin or ceramic with a low coefficient of friction so as to suppress the effects of friction.

For example, techniques described below have been proposed so as to eliminate such material or design limitations.

Specifically, Japanese Patent Laying-Open No. 2000-2190 (Patent Document 1) discloses a bearing member housed in a bearing casing and a shaft sleeve attached to a main shaft and in sliding contact with the bearing member. A slide bearing device for a vertical shaft pump is disclosed, which is configured such that a bottomed annular water reservoir is provided in the upper portion thereof with an opening through which pumped water can flow in and out, and a bearing member is submerged in the bottomed annular water reservoir.

In JP-A-2000-266042 (Patent Document 2), an annular hard bearing member, a shaft sleeve attached to a main shaft and in sliding contact with the bearing member, and an annular hard bearing member are fitted and arranged on the outer periphery. a metal ring-shaped back metal, a ring-shaped cushioning member fitted on the back metal and arranged on the outer periphery, and a metal ring-shaped shell fitted on the back metal and arranged on the periphery, the back metal describes a plain bearing device for a vertical shaft pump provided with an annular reservoir of concave cross-section having an upper end opening capable of storing pumped water.

Japanese Patent Application Laid-Open No. 5-44689 (Patent Document 3) discloses a ceramic shaft back comprising a ceramic bearing made of porous SiC impregnated with lubricating oil, a sleeve attached to a main shaft and in sliding contact with the ceramic bearing, and a ceramic bearing. A ceramic shaft cushioning material supported via a metal is provided, a gap is formed in the surfaces where the ceramic bearing and the ceramic shaft back metal contact each other, and oil or water is supplied to the gap through a pipe. A sump pump bearing construction is described.

Japanese Patent Application Laid-Open No. 2017-166423 (Patent Document 4) includes a cyclone separator that filters part of the water pumped by the pump, a flow meter and a differential pressure gauge that reliably send the purified water to the submerged bearing.

In the technique described in Patent Document 1, a shaft sleeve that rotates integrally with a main shaft is provided with a bottomed annular water reservoir provided with an opening through which pumped water can flow in and out. It is difficult to secure the necessary amount of water to submerge the bearing member in the water reservoir. There is a problem that it is difficult to ensure In addition, there is a problem that sand and mud contained in the pumped water accumulate in the water reservoir and damage the sliding portion (in other words, the sliding contact surface) between the bearing member and the shaft sleeve.

In the technique described in Patent Document 2, the back metal is provided with an annular water storage portion having a concave cross-section having an upper end opening capable of storing pumped water, and pumped water is stored in the water storage portion, and the water cooling action and water storage of this stored water are performed. Since the back metal is cooled by the cooling effect of the vaporization heat when it evaporates, and the bearing member is cooled via the back metal, the sliding part between the bearing member and the shaft sleeve is not directly cooled with water. , there is a problem that it cannot be sufficiently cooled. Moreover, as in Patent Document 1, water evaporates due to the frictional heat of the bearing when the pump is started, so there is a problem that it is difficult to secure the necessary amount of water.

In the technique described in Patent Document 3, a space is formed in the surfaces where the ceramic bearing and the ceramic shaft back metal contact each other, and oil or water is supplied to the space to remove the oil or water in the space. Since the sliding surface of the bearing is lubricated by exuding through the pores of SiC to the sliding surface of the bearing, the sliding portion between the bearing and the sleeve is not directly cooled with water, so there is a problem that it cannot be sufficiently cooled. There is

In the technique described in Patent Document 4, the cyclone separator cannot remove minute foreign matter, and the submerged bearing at the water supply destination wears out early, so there is a possibility that the pump cannot be operated.

JP-A-2000-2190 JP-A-2000-266042 JP-A-5-44689 JP 2017-166423 A

An embodiment of the present invention has been devised in view of the above circumstances, and can prevent the bearing and the shaft sleeve from operating in a dry state by supplying liquid between the bearing and the shaft sleeve during initial operation. , the purpose of which is to provide a vertical shaft pump. In addition, an embodiment of the present invention provides a preceding standby operation method for a vertical shaft pump that can prevent the bearings and the shaft sleeve from operating in a dry state by supplying liquid between the bearing and the shaft sleeve during initial operation. intended to provide

According to one embodiment of the present invention, the vertical shaft pump includes a submersible bearing member that rotatably supports a rotating shaft to which an impeller is attached, and a reservoir that stores a lubricating liquid for the submersible bearing member. a first feed line having an inlet end connected to the reservoir; a second feed line having an outlet end for supplying lubricating liquid to the submersible bearing member; a flow restricting member disposed between the first and second feed lines for restricting the flow of lubricating liquid into the lines; can.

Further, according to one embodiment of the present invention, there is provided a method of performing a preliminary standby operation of a vertical shaft pump, comprising: a liquid storage tank in which lubricating liquid is stored; opening a first valve provided in the pipeline and setting a timer; and supplying the lubricating liquid in the reservoir to the underwater bearing member at a flow rate reduced by a flow rate restricting member provided in the pipeline. starting the pump motor of the vertical shaft pump after a time set by a timer; and closing the first valve after stopping the pump motor.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows the whole vertical axis|shaft pump outline|summary by 1st Embodiment of this invention. It is a mimetic diagram showing the whole vertical axis pump outline by a 2nd embodiment of the present invention. It is a mimetic diagram showing the whole vertical axis pump outline by a 3rd embodiment of the present invention. It is a partial sectional view of a vertical shaft pump. It is a partial sectional view of a vertical shaft pump. 4 is a lateral cross-sectional view of the bearing shown in FIG. 3; FIG. It is a flowchart which shows the starting process of a vertical shaft pump. It is a flowchart which shows the stop process of a vertical shaft pump.

Hereinafter, each embodiment of the present invention will be described with reference to the drawings. Note that the following description is merely an example, and is not intended to limit the technical scope of the present invention to the following embodiments. In addition, in the drawings, the same or corresponding components are denoted by the same reference numerals, and redundant explanations are omitted. In the following description, terms indicating directions such as "up" and "down" mean directions in the installation state of the vertical shaft pump shown in FIG. 1 and the like.
[First embodiment]

FIG. 1 is a schematic diagram showing an overall overview of a vertical shaft pump 100 according to a first embodiment of the present invention. The vertical shaft pump 100 includes a rotating shaft 101 extending in the vertical direction, an impeller 102 attached to the lower end of the rotating shaft 101, and a pump motor (not shown) provided at the upper end of the rotating shaft 101 to rotationally drive the rotating shaft 101. and the like. The vertical shaft pump 100 is a pump that pumps water upward through a pump casing 108 by rotating an impeller 102 .

Further, the vertical shaft pump 100 is a preceding standby operation type pump. In the preceding standby operation, first, the impeller 102 starts to rotate in the air before the impeller 102 is submerged (in-air operation) based on rainfall information and the like regardless of the suction water level. When the water level rises to the position of the impeller 102, the operation state of the vertical shaft pump 100 changes from the operation (air-water agitation operation) in which the liquid to be handled is agitated by the impeller 102, and the air supplied from the intake port is sucked together with the liquid to be handled. After gradually increasing the amount of liquid (air-water mixing operation), it shifts to normal operation (steady operation) in which the liquid to be handled is discharged at the rated flow rate.

The vertical shaft pump 100 comprises a substantially cylindrical pump casing 108 surrounding a rotating shaft 101 , an impeller 102 and guide vanes 103 . Guide vanes 103 are fixed to the inner peripheral surface of pump casing 108 . Also, a bowl bushing 110 is fixed to the pump casing 108 via the guide vanes 103 . Further, the guide vanes 103 convert the swirl component of the water flow pumped by the impeller 102 into a vertically upward component.

Pump casing 108 may include suction bell 104, which is the pump inlet, and discharge bowl 105, which houses guide vanes 103 and bearing member 120A. The suction bell 104 is formed in a bellmouth shape. The discharge bowl 105 is formed in a substantially cylindrical shape surrounding the guide vanes 103, and is formed so that the diameter of the cylinder expands along the extension direction of the rotating shaft 101 and then contracts.

The pump casing 108 may also include a suspension tube 106 positioned above the discharge bowl 105 and extending to a desired height. The suspension tube 106 is formed in a cylindrical shape surrounding the rotating shaft 101 . The liquid handled by the vertical shaft pump 100 (in other words, the liquid transferred by the vertical shaft pump 100) is pumped up through the suspension pipe 106 . Pump casing 108 may also include a discharge elbow (in other words, discharge casing) 107 that is connected to suspension tube 106 . Discharge elbow 107 is formed to extend vertically along axis of rotation 101 and then turn substantially horizontally. Accordingly, the pumped handling liquid is redirected substantially horizontally by the discharge elbow 107 . The suction bell 104 , the discharge bowl 105 , the hanging pipe 106 and the discharge elbow 107 are appropriately connected by flanges to form a pump casing 108 .

The vertical shaft pump 100 also includes a submersible bearing member 120 that rotatably supports the rotating shaft 101 . In this embodiment, two underwater bearing members (hereinafter referred to as bearing members) 120A and 120B are provided. However, in vertical shaft pump 100, the number of bearing members 120 is not particularly limited.

The bearing members 120A and 120B are slide bearings provided along the rotating shaft 101 and spaced apart from each other. A shaft sleeve (not shown in FIG. 1) is attached to the rotating shaft 101 so as to be in sliding contact with the bearing surfaces of the bearing members 120A and 120B. Bearing member 120A is fixed to bowl bushing 110 via support member 130 . The bearing member 120B can be arranged at a higher position than the bearing member 120A. The bearing member 120B can be supported by a support member 132 fixed to the pump casing 108. As shown in FIG.

Suspension pipe 106 is inserted into opening hole 1101 of installation floor 1100 . Thus, the vertical shaft pump 100 can be fixed and installed on the installation floor 1100 below the discharge elbow 107 .

As shown in FIG. 1, the vertical shaft pump 100 includes liquid feed lines 1102A and 1102B (second liquid feed lines) for supplying lubricating liquid to the bearing members 120A and 120B. It is desirable that the number of the second liquid supply pipes is the same as the number of bearing members. Each of the liquid supply conduits 1102A and 1102B has an inlet end (not labeled) that opens into the liquid supply receiver 1104 . By inserting a camera from the inlet end, it is possible to check whether there is any clogging of foreign matter in the second liquid supply pipe. The inside of the road can be cleaned. The liquid supply receiver 1104 is installed outside the pump casing 108 at a position above the bearing members 120A and 120B. Also, the feed lines 1102A, 1102B can have outlet ends (not numbered) that open at or near the bearing members 120A, 120B. In this embodiment, the liquid supply receiver 1104 can have the shape of a container or tank forming an upper opening 1106 that opens upward. Inlet ends of the liquid supply pipes 1102A and 1102B are open to the bottom wall of the liquid supply receiver 1104 . The volume of the liquid supply receiver 1104 can be determined as appropriate. A check valve 1105 can be provided in the liquid supply receiver 1104 or in the liquid supply pipes 1102A and 1102B on the downstream side of the liquid supply receiver 1104 . Also, an overflow pipe 1108 can be provided in the liquid supply receiver 1104 .

Lubricating liquid is supplied to the liquid supply receiver 1104 from a liquid storage tank 1110 installed on the installation floor 1100 outside the pump casing 108 through a liquid supply line 1126 (first liquid supply line). The liquid supply receiver 1104 is divided into a plurality of chambers 1104a and 1104b corresponding to the number of bearing members 120 (two in this embodiment), and branch pipes 1126a and 1126b from the liquid supply pipe 1126 are installed above each chamber. be done. Thereby, it is possible to visually check whether the lubricating liquid is flowing out from each of the branch pipes 1126a and 1126b. In the illustrated example, a single liquid supply receiver 1104 is divided by a partition plate 1103 into two chambers 1104a and 1104b respectively corresponding to the two bearing members 120A and 120B. However, the chambers 1104a, 1104b may have the form of separate vessels or vessels independent of each other. The reservoir 1110 is also connected to a discharge line 1112 . The discharge pipe 1112 has one end (called the outlet end) connected to the liquid storage tank 1110 and the other end (called the inlet end) connected to the shaft seal portion 107 a of the discharge elbow 107 of the vertical shaft pump 100 . . Thus, in the present embodiment, the handling liquid discharged from the vertical shaft pump 100 is stored in the liquid storage tank 1110 and used as the lubricating liquid. Therefore, in the following description, the liquid to be handled in the liquid storage tank 1110 may be referred to as lubricating liquid. As will be described later, the discharge pipe line 1112 may be connected to the discharge elbow 107 at a portion other than the shaft seal portion 107a. Also, the discharge conduit 1112 may be connected to a discharge pipe connected to the discharge port 107 b of the discharge elbow 107 .

In FIG. 1, the liquid reservoir 1110 may be provided with a foreign matter removal device 1116 such as a single or multiple liquid permeable mats or sheets for removing foreign matter from the handled liquid. Further, the discharge pipe line 1112 is preferably connected to the upper part of the height direction center of the liquid storage tank 1110 , specifically, to the upper part of the side wall or the upper wall of the liquid storage tank 1110 . Foreign matter can be removed from the liquid to be handled by passing the liquid to be handled from the discharge line 1112 through the foreign matter removing device 1116 . An openable and closable lid 1118 may be provided on the upper wall of the reservoir 1110 so that a foreign matter removal device 1116 such as a liquid permeable mat can be cleaned and/or replaced. The volume of liquid storage tank 1110 is not particularly limited. The reservoir 1110 may be provided with an overflow pipe 1120 . Although not specifically shown in FIG. 1, the excess lubricating liquid flowing through the overflow pipe 1120 may optionally be merged with the handling liquid sucked into the vertical axis pump 100 below the installation floor 1100 . Overflow line 1120 may also include a return line 1122 leading back to reservoir 1110 . An on-off valve 1124 can be provided on the return pipe 1122 .

The fluid supply line 1126 is configured to transfer the lubricating fluid in the reservoir 1110 to the exterior of the reservoir 1110 . The liquid supply line 1126 may be provided with a flow control valve 1114 and, if necessary, with a foreign matter removal device (not shown) such as a strainer or a dual strainer. In addition, an on-off valve 1130 can be provided in the liquid supply line 1126 . In this embodiment, the on-off valve 1130 is configured as an electric valve, and can be operated by a control device (not shown) that controls the operation of the vertical shaft pump 100, for example. The inlet end of the feed line 1126 is connected to the reservoir 1110 and the outlet end opens into the feed receiver 1104 . A flow restrictor 1132 may be attached to the outlet end of the feed line 1126 . In the illustrated example, flow restricting members 1132a, 1132b are attached to the outlet ends of the branch pipes 1126a, 1126b of the liquid supply line 1126, respectively. The flow rate restricting member 1132 is, for example, a low-pressure nozzle, a spray nozzle, a valve member such as a ball valve or a flap valve, a mesh member, or the like, which can reduce the flow rate of the lubricating liquid flowing into the liquid supply receiver 1104. If there is, it is not particularly limited. Accordingly, the flow restrictor 1132 may be attached to the receptacle 1104 . Thus, the lubricating liquid transferred from the liquid storage tank 1110 is supplied to the liquid supply receiver 1104 at a flow rate reduced by the flow rate restricting member 1132 . Since the liquid supply receiver 1104 is installed outside the pump casing 108, the flow of the very small amount of lubricating liquid can be easily visually confirmed. In addition, maintenance of the flow rate restricting member 1132 can be easily performed.

In this embodiment, the difference in elevation between the inlet end and the outlet end of the liquid supply line 1126 allows the lubricating liquid to naturally flow down from the liquid reservoir 1110 to the liquid supply receiver 1104 . However, transfer of lubricating fluid from reservoir 1110 may optionally be accomplished using a pump. The lubricating liquid naturally flows from the liquid supply receiver 1104 to the bearing members 120A, 120B through the liquid supply pipes 1102A, 1102B.

In the illustrated example, the liquid supply receiver 1104 has an upper opening 1106 that opens upward, but in another embodiment, the liquid supply receiver 1104 has an opening in the side wall. may be used, in which case the feed line 1126 may be connected to an opening in the side wall.
[Second embodiment]

As described above, the discharge line 1112 can be connected to the discharge elbow 107 at a portion other than the shaft seal portion 107a, or connected to a discharge pipe connected to the discharge outlet 107b of the discharge elbow 107. can be In a second embodiment shown in FIG. 1A, the discharge line 1112 is connected to the discharge tube 109 which is connected to the discharge outlet 107b of the discharge elbow 107. As shown in FIG. In addition, in FIG. 1A, the same reference numerals as in FIG. 1 denote the same parts as in FIG. Further, in the second embodiment, detailed descriptions of the parts common to the first embodiment will be omitted.

In FIG. 1A, the reservoir 1110 is substantially enclosed and has an air release valve 1206 on the top wall. In addition, the air vent valve 1206 may be an air vent valve having a known configuration in which a float is arranged inside the valve box. When air accumulates in the valve box, the float descends along with the water surface, thereby opening the valve seat and discharging the air. As a result, the air flowing into the liquid storage tank 1110 together with the liquid to be handled and accumulated in the liquid storage tank 1110 can be released by the air release valve 1206 .

An on-off valve 1202 and/or a pressure reducing valve 1204 can be provided in the discharge line 1112 . The on-off valve 1202 may be an electrically operated valve. The on-off valve 1202 is of a normally closed type, and by opening the on-off valve 1202 when the vertical shaft pump 100 is started, the liquid to be handled can flow into the liquid storage tank 1110 . The liquid to be handled discharged from the discharge pipe 109 flows into the liquid storage tank 1110 at a high pressure. In the second embodiment, the hydraulic pressure of the liquid to be handled from the discharge pipe 109 can be reduced by providing the pressure reducing valve 1204 in the discharge pipe 1112 .

In addition, a water level gauge 1208 may be provided in the liquid storage tank 1110 so as to detect the water level in the liquid storage tank 1110 . As a result, control can be performed to close the on-off valve 1202 when the liquid storage tank 1110 is filled with water.

In the example of FIG. 1A, liquid containing a relatively large amount of foreign material flows from reservoir 1110 into feed line 1126 . Therefore, it is desirable to provide a foreign matter removing device 1128 such as a strainer or multiple strainers in the liquid supply line 1126 .

The lubricating fluid can gravity flow down from the reservoir 1110 to the fluid receptacle 1104 . However, transfer of lubricating fluid from reservoir 1110 may optionally be accomplished using a pump. The lubricating liquid flows from the liquid supply receiver 1104 through the liquid supply pipes 1102A and 1102B to the bearing member 1.
Gravity flows to 20A and 120B.
[Third embodiment]

Additionally, a third embodiment of the present invention is shown in FIG. 1B. In FIG. 1B, parts common to those in FIG. 1 are denoted by the same reference numerals as in FIG. 1, and detailed descriptions of parts common to the first embodiment are omitted.

As in the first embodiment, in the third embodiment, the discharge line 1112 is connected to the discharge elbow 107 at the shaft seal portion 107a. The amount of the handled liquid leaking from the shaft seal portion 107a varies depending on the sealing method of the shaft seal portion 107a. For example, when a mechanical seal is employed, the liquid to be handled leaks out from a minute gap in the seal portion, so the flow rate of the liquid flowing out from the shaft seal portion 107a to the discharge pipe 1112 is relatively small. In this case, the liquid in the discharge pipe 1112 is less likely to be contaminated with foreign matter, so that the flow rate restricting member 1132 is less likely to be clogged with foreign matter. Therefore, it is not always necessary to visually confirm the flow of the lubricating liquid from the flow rate restricting member 1132 . In this case, as shown in FIG. 1B, the liquid supply receiver 1104 can be omitted. In the third embodiment shown in FIG. 1B, the branch pipes 1126a, 1126b of the liquid supply line 1126 and the liquid supply lines 1102A, 1102B are connected via a flow restricting member 1132 arranged outside the pump casing . ing. Thus, lubricating fluid transferred from reservoir 1110 passes through supply lines 1102A, 1102B at a flow rate reduced by flow restrictor 1132 .

Also in the third embodiment, the lubricating liquid can flow naturally from the reservoir 1110 to the flow restricting member 1132 . However, transfer of lubricating fluid from reservoir 1110 may optionally be accomplished using a pump. The lubricating liquid that has passed through the flow rate restricting member 1132 naturally flows down to the bearing members 120A and 120B through the liquid supply pipes 1102A and 1102B.

As a precaution, in the third embodiment, the fluid supply lines 1102A, 1102B may be configured to be partially transparent so that the flow of lubricating fluid from the flow restrictor 1132 can be observed. Further, for example, a valve member 1210 for inserting an inspection camera into the liquid supply conduits 1102A and 1102B is attached to the pipe walls of the liquid supply conduits 1102A and 1102B, so that the inside of the liquid supply conduits 1102A and 1102B can be inspected. It may be configured as

FIG. 2 is a partial cross-sectional view of the vertical shaft pump 100 according to the first to third embodiments, showing an example of the configuration of the outlet side of the liquid supply pipe 1102B. Here, as the bearing member 120, the bearing member 120B will be described as an example, but substantially the same configuration may be applied to the bearing member 120A. As shown in FIG. 2, the bearing member 120B includes a bearing 2120 including a bearing surface (in other words, a sliding contact surface) that makes sliding contact with the shaft sleeve 101B of the rotary shaft 101, and a bearing case 2122 to which the bearing 2120 is attached. be able to. The bearing member 120B may also include a cushioning material 2124 disposed between the bearing 2120 and the bearing case 2122. As shown in FIG. However, the specific shape of the bearing member 120B is not limited to that illustrated.

In the example of FIG. 2, the feed line 1102B is bent downward so that its outlet end opens above the bearing surface. As a result, a minute flow rate of the lubricating liquid can be supplied from a position close to the bearing surface. Also, in the example of FIG. 2, the upper end 2120a of the bearing surface is tapered. A very small amount of lubricating liquid may be dripped in the form of water droplets as shown in FIG. Drops of the lubricating liquid can be smoothly guided to the bearing surface along the slope of the upper end 2120a of the bearing surface. However, the tapered surface as described above may not necessarily be provided, and the bearing surface may be entirely flat.

Further, as shown in FIG. 2, a blade 200 can be attached to the rotary shaft 101. The vane 200 can be provided at a position lower than the bearing member 120B. Wind pressure can be generated by the blades 200 rotating together with the rotating shaft 101 . This wind pressure pushes back upward the lubricating liquid that has passed through the bearing member 120B, and lubrication can be performed by the pushed back lubricating liquid. Moreover, since the bearing surface can be cooled by wind pressure, the life of the bearing surface can be lengthened.

FIG. 3 is a partial cross-sectional view of the vertical shaft pump 100 showing another configuration example on the outlet side of the liquid supply pipe 1102B. In the example of FIG. 3, the liquid supply line 1102B is connected to the internal space 2126 of the bearing case 2122, and the internal space 2126 is configured to be filled with lubricating liquid. A tubular member 2128 having an outlet end opening at bearing surface 2120b is disposed at different positions vertically and passes through bearing 2120 and cushioning material 2124 . The inlet end of tubular member 2128 opens into interior space 2126 . With the configuration of FIG. 3, a very small amount of lubricating liquid can be directly supplied to the bearing surface 2120b.

FIG. 4 shows a transverse cross-section of bearing 2120 of bearing member 120B shown in FIG. It can be seen in FIG. 4 that tubular members 2128 are arranged circumferentially around bearing 2120 . By supplying the lubricating liquid from multiple positions in the circumferential direction, the bearing surface 2120b can be efficiently cooled, and the life of the bearing 2120 can be extended. Further, as shown in FIG. 4, it is desirable that the tubular member 2128 be arranged so as to open at an axial groove (so-called oil groove) 2120C of the bearing surface 2120b.

Referring again to FIG. 1, during operation of the vertical shaft pump 100 of the first embodiment, from the discharge line 1112, through the reservoir 1110 and the feed line 1126, the feed receiver 1104 and the feed lines 1102A, 1102B. Thus, the lubricating fluid is continuously supplied to the bearing members 120A, 120B. When the vertical shaft pump 100 is started and stopped, the on-off valve 1130 provided in the liquid supply line 1126 can be operated. When the on-off valve 1130 is an electric valve, the operation of the on-off valve 1130 can be automatically controlled by a control device that controls driving of the rotary shaft 101, for example. As described above, the vertical shaft pump 100 is a preceding standby operation type pump. In such a vertical shaft pump 100, when a preset starting condition for the preceding standby operation is established, the on-off valve 1130 is opened and the timer of the control device is turned on. When the predetermined time has passed and the timer is turned off, the pump motor is started, and the vertical shaft pump 100 starts running in the air. The predetermined time of the timer can be, for example, the time from when the valve 1130 is opened until a sufficient amount of lubricating fluid begins to be supplied to the bearing members 120A, 120B, which is a preset time for each pump. It's okay. When the pump motor stops, the on-off valve 1130 is closed and the supply of lubricating fluid to the bearing members 120A and 120B is stopped. FIG. 5 is a flow diagram showing the operation of the on-off valve 1130 when the vertical shaft pump 100 is started, and FIG. 6 is a flow diagram showing the operation of the on-off valve 1130 when the vertical shaft pump 100 is stopped.

In the first embodiment, the lubricating liquid exiting the liquid supply conduit 1126 is supplied to the bearing members 120A, 120B at a very small flow rate reduced by the flow rate restricting member 1132 . Since part of the liquid to be handled from the discharge elbow 107 (in other words, the liquid after being pumped) flows into the liquid storage tank 1110, a sufficient amount of the liquid will flow into the liquid storage tank 1110 while the vertical shaft pump 100 is in operation. of lubricating fluid can be stored. Therefore, after the operation of the vertical shaft pump 100 is stopped, it is possible to prepare for the restart (that is, the start of the dry operation). That is, when the starting condition is established, the on-off valve 1130 can be opened prior to starting, and the supply of the lubricating fluid can be started.

The lubricating liquid can be supplied even after the vertical shaft pump 100 is started. The lubricating liquid is supplied to the bearing members 120A and 120B after foreign matters are removed by the foreign matter removing device 1116 of the liquid storage tank 1110 and/or the foreign matter removing device of the liquid supply pipe 1126 or the like. Therefore, liquid containing less foreign matter than the liquid handled in the pump casing 108 can be supplied as the lubricating liquid.

Further, according to the first embodiment, the liquid supply receiver 1104 is provided between the liquid storage tank 1110 and the bearing members 120A and 120B. The lubricating liquid that has flowed down from the liquid storage tank 1110 has its flow rate reduced by the flow rate restricting member 1132 and flows into the supply liquid receiving portion 1104 . In this way, even if the volume of the liquid storage tank 1110 is small, a very small amount of lubricating liquid can be supplied to the bearing surface over a relatively long period of time. The flow rate supplied to the bearing surface can be on the order of several milliliters per minute.

Thus, according to the first embodiment of the present invention, part of the liquid handled by the vertical shaft pump 100 can be supplied to each bearing member 120 as the lubricating liquid. Liquid is supplied through drain line 1112, reservoir 1110, first feed line 1126, feed receiver 1104 and second feed lines 1102A, 1102B. Since the liquid can be stored in the reservoir 1110 as the lubricating liquid, the lubricating liquid in the reservoir 1110 can be supplied to the bearing member 120 during the air operation before starting the pump motor. By arranging the contaminant removing device 1116 or the like in the liquid storage tank 1110 and/or the liquid supply line 1126, liquid containing less contaminants than the liquid handled in the pump casing 108 can be used as the lubricating liquid.

In addition, the lubricating liquid is supplied to the liquid supply receiver 1104 installed between the liquid storage tank 1110 and the bearing member 120 at a flow rate reduced by the flow rate restricting member 1132 . As a result, even if the volume of the liquid storage tank 1110 is relatively small, the lubricating liquid can be supplied for a long time during air operation. Even a minute flow rate of the lubricating fluid can sufficiently suppress the increase in the bearing temperature.

By arranging the supply liquid receiver 1104 outside the pump casing 108, it is possible to easily visually confirm the flow of the lubricating liquid at a very small flow rate, and maintenance of the flow rate restricting member 1132 can be easily performed. can. In addition, the lubricating liquid at a very small flow rate can be reliably supplied to the bearing surface by arranging the outlet ends of the liquid supply pipes 1102A and 1102B in the vicinity of the bearing surface or opening them directly at the bearing surface. Further, by providing an on-off valve 1130 as an electric valve in the first liquid supply pipe 1126 on the upstream side of the liquid supply receiver 1104, it is possible to automatically control the supply of the lubricating liquid during the preceding standby operation. be.

The second embodiment shown in FIG. 1A also allows lubricating fluid for bearing member 120 to be supplied at a reduced flow rate by flow restriction member 1132 . As a result, even if the volume of the liquid storage tank 1110 is relatively small, the lubricating liquid can be supplied for a long time during air operation. Even a minute flow rate of the lubricating fluid can sufficiently suppress the increase in the bearing temperature.

The second embodiment can be suitably implemented when a large amount of liquid to be handled is taken out from the vertical shaft pump 100, such as when the discharge line 1112 is connected to the discharge pipe 109. FIG. In the preceding standby operation of the vertical shaft pump 100 according to the second embodiment, when the preset conditions for starting the preceding standby operation are met, the on-off valve 1130 is opened and the timer of the control device is turned on. When the predetermined time has passed and the timer is turned off, the pump motor is started, and the vertical shaft pump 100 starts running in the air. When the pump motor is started, the on-off valve 1202 is opened, and the liquid to be handled from the discharge pipe 109 flows into the liquid storage tank 1110 . When the water gauge 1208 detects that the liquid storage tank 1110 is full, the on-off valve 1202 is closed. The predetermined time of the timer can be, for example, the time from the opening of the on-off valve 1130 to the start of sufficient supply of the lubricating fluid to the bearing members 120A and 120B, which is the time preset for each pump. can be When the pump motor stops, the on-off valve 1130 is closed and the supply of lubricating fluid to the bearing members 120A and 120B is stopped.

The third embodiment shown in FIG. 1B also provides lubricating fluid for the bearing member 120 by
132 provides substantially the same effect as the first embodiment in that it can be supplied at a reduced flow rate. Further, the third embodiment can be suitably implemented when a relatively small flow rate of the liquid to be handled is taken out from the vertical shaft pump 100, such as when a mechanical seal is adopted for the shaft seal portion 107a. Since the amount of foreign matter in the liquid to be handled is small, the first liquid supply pipe 1126 (branch pipes 1126a and 1126b in the illustrated example) and the second liquid supply pipe do not require the liquid supply receiver 1104. Channels 1102A, 1102B can be connected via flow restrictor 1132 . Also, the foreign matter removing devices 1116, 1128 and the like can be omitted. Therefore, equipment for the vertical shaft pump 100 can be simplified.

Although the embodiment of the present invention has been described above, the above-described embodiment of the present invention is for facilitating understanding of the present invention, and does not limit the present invention. The present invention may be modified and improved without departing from its spirit, and the present invention includes equivalents thereof. In addition, any combination or omission of each component described in the claims and the specification is possible within the range that solves at least part of the above-described problems or achieves at least part of the effect. be.

The present invention includes the following aspects.
1. A vertical shaft pump,
an underwater bearing member that rotatably supports a rotating shaft to which the impeller is attached;
a reservoir in which lubricating liquid for the underwater bearing member is stored;
a first feed line having an inlet end connected to the reservoir;
a second feed line having an outlet end for supplying lubricating liquid to the underwater bearing member;
a flow restricting member disposed between the first fluid supply line and the second fluid supply line to restrict the flow of lubricating fluid into the second fluid supply line;
Vertical shaft pump.
2. 1. The method according to 1 above, wherein the first liquid supply line is provided with an on-off valve. The vertical shaft pump described in .
3. 1. The method according to 1 above, wherein the first liquid supply line is provided with a flow control valve. or 2. The vertical shaft pump described in .
4. 1. A check valve is attached to the second liquid supply line. ~3. The vertical shaft pump according to any one of 1.
5. 1. The vertical shaft pump comprises a plurality of submersible bearing members, a plurality of second liquid supply pipes and a plurality of flow restricting members in the same number as the plurality of submersible bearing members. ~ 4. The vertical shaft pump according to any one of 1.
6. A discharge line having an inlet end connected to the discharge casing or a discharge pipe connected to the discharge port of the discharge casing for receiving the liquid handled by the vertical axis pump, and an outlet end connected to the reservoir. The above 1. ~ 5. The vertical shaft pump according to any one of 1.
7. 6. above, wherein the inlet end of the discharge pipe is connected to the shaft seal portion of the discharge casing; The vertical shaft pump described in .
8. 7. above, wherein the overflow pipe is connected to the liquid storage tank; The vertical shaft pump described in .
9. The vertical shaft pump further includes a feed receiver disposed between the first feed conduit and the second feed conduit, the first feed conduit being connected to the feed receiver. Disposed to supply a lubricating fluid, the second fluid supply line has an inlet end connected to the fluid receptacle, and the flow restricting member is connected to the first fluid supply line or the fluid supply. 7. Attached to the liquid receiver; or 8. The vertical shaft pump described in .
10. 9. above, wherein the overflow pipe is connected to the liquid supply receiver; The vertical shaft pump described in .
11. 9. above, wherein a foreign matter removing device is arranged in the liquid storage tank or the first liquid supply pipeline; or 10. The vertical shaft pump described in .
12. 7 above, wherein the pipe wall of the second liquid supply pipeline is partially transparent, or a valve member into which a camera device can be inserted is attached to the pipe wall of the second liquid supply pipeline. . or 8. The vertical shaft pump described in .
13. 6. above, wherein the inlet end of the discharge line is connected to a discharge pipe connected to the discharge port of the discharge casing; The vertical shaft pump described in .
14. The vertical shaft pump further includes a feed receiver disposed between the first feed conduit and the second feed conduit, the first feed conduit being connected to the feed receiver. Disposed to supply a lubricating fluid, the second fluid supply line has an inlet end connected to the fluid receptacle, and the flow restricting member is connected to the first fluid supply line or the fluid supply. 13. above, attached to the liquid receiver. The vertical shaft pump described in .
15. 14. above, wherein the overflow pipe is connected to the liquid supply receiver; The vertical shaft pump described in .
16. 13. A foreign matter removing device is arranged in the liquid storage tank or the first liquid supply line. ~15. The vertical shaft pump according to any one of 1.
17. 13. above, wherein an on-off valve is provided in the discharge pipeline; ~16. The vertical shaft pump according to any one of 1.
18. 13. above, wherein the discharge line is provided with a pressure reducing valve. ~17. The vertical shaft pump according to any one of 1.
19. 13. The liquid storage tank is provided with an air vent valve. ~18. The vertical shaft pump according to any one of 1.
20. 13. above, wherein the liquid storage tank is provided with a water level gauge for detecting the water level in the liquid storage tank. ~19. The vertical shaft pump according to any one of 1.
21. A method for performing a preceding standby operation of a vertical shaft pump, comprising:
a step of opening a first valve provided in a reservoir in which the lubricating liquid is stored and a conduit disposed between the reservoir and the underwater bearing member, and setting a timer;
a step of supplying the lubricating liquid in the liquid storage tank to the underwater bearing member at a flow rate reduced by a flow rate restricting member provided in the conduit;
starting the pump motor of the vertical shaft pump after the time set by the timer;
closing the first valve after stopping the pump motor.
22. The step of supplying the underwater bearing member comprises: flowing the lubricating liquid in the liquid storage tank to a liquid supply receiving portion provided in the pipe; 21. above, including supplying the submersible bearing member with a flow rate reduced by the provided flow restriction member. The method described in .
23. The step of starting the pump motor includes the step of flowing the liquid handled by the vertical shaft pump from the pump casing to the liquid storage tank,
21. The step of flowing into the liquid storage tank includes opening the second valve provided in the conduit connecting the pump casing and the liquid storage tank. or 22. The method described in .
24. 23. above, further comprising the step of closing the second valve when the reservoir is full. The method described in .

INDUSTRIAL APPLICABILITY The present invention can be widely applied to a preceding standby operation type vertical shaft pump.

100 Vertical shaft pump 101 Rotary shaft 101B Shaft sleeve 102 Impeller 103 Guide vane 104 Suction bell 105 Discharge bowl 106 Hanging pipe 107 Discharge elbow 107a Shaft seal 107b Discharge port 108 Casing 109 Discharge pipe 110 Bowl bushings 130, 132 Support member 120, 120A, 120B Underwater bearing member 200 Blade 1100 Installation floor 1101 Opening holes 1102A, 1102B Liquid supply pipe (second liquid supply pipe)
1103 Partition plate 1104 Supply liquid receivers 1104a, 1104b Chamber 1105 Check valve 1106 Upper opening 1108 Overflow pipe 1110 Liquid storage tank 1112 Discharge pipe line 1114 Flow control valve 1116 Foreign object removal device 1118 Open/close lid 1120 Overflow pipe 1122 Return pipe 1124 switching valve 1126 liquid supply line (first liquid supply line)
1126a, 1126b Branch pipe 1128 Foreign matter removing device 1130 On-off valves 1132, 1132a, 1132b Flow rate limiting member 1202 On-off valve 1204 Pressure reducing valve 1206 Air vent valve 1208 Water level gauge 1210 Valve member 2120 Bearing 2120a Upper end 2120b Bearing surface (sliding contact surface)
2120c axial groove 2122 bearing case 2124 cushioning material 2126 internal space 2128 tubular member

Claims (24)

A vertical shaft pump,
an underwater bearing member that rotatably supports a rotating shaft to which the impeller is attached;
a reservoir in which lubricating liquid for the underwater bearing member is stored;
a first feed line having an inlet end connected to the reservoir;
a second feed line having an outlet end for feeding lubricating liquid to the underwater bearing member;
a flow restricting member provided between the first fluid supply line and the second fluid supply line so as to restrict the flow of lubricating fluid entering the second fluid supply line. ,
Vertical shaft pump. 2. The vertical shaft pump according to claim 1, wherein an on-off valve is provided in said first liquid supply line. 3. The vertical shaft pump according to claim 1, wherein the first liquid supply line is provided with a flow control valve. The vertical shaft pump according to any one of claims 1 to 3, wherein a check valve is attached to said second liquid supply line. 2. The vertical shaft pump according to claim 1, comprising a plurality of the submersible bearing members, and a plurality of the second liquid supply pipes and a plurality of the flow restricting members, which are the same in number as the submersible bearing members. 5. The vertical shaft pump according to any one of 1 to 4. a discharge having an inlet end connected to a discharge casing or a discharge pipe connected to a discharge port of the discharge casing for receiving liquid handled by the vertical shaft pump, and an outlet end connected to the reservoir; The vertical shaft pump according to any one of claims 1 to 5, comprising a conduit. 7. The vertical shaft pump according to claim 6, wherein the inlet end of the discharge line is connected to the shaft seal of the discharge casing. 8. The vertical shaft pump according to claim 7, wherein an overflow pipe is connected to said reservoir. The vertical shaft pump further includes a liquid supply receiver arranged between the first liquid supply line and the second liquid supply line, and the first liquid supply line is connected to the arranged to supply a lubricating fluid to a fluid supply receiver, the second fluid supply conduit having an inlet end connected to the fluid supply receiver, and the flow restricting member comprising the 9. The vertical shaft pump according to claim 7 or 8, which is attached to the first liquid supply line or the liquid supply receiver. 10. The vertical shaft pump according to claim 9, wherein an overflow pipe is connected to said liquid supply receiver. 11. The vertical shaft pump according to claim 9 or 10, wherein a foreign matter removing device is arranged in said liquid storage tank or said first liquid supply pipe line. The wall of the second liquid supply line is partially transparent, or the wall of the second liquid supply line is attached with a valve member into which a camera device can be inserted. The vertical shaft pump according to claim 7 or 8. 7. The vertical shaft pump of claim 6, wherein the inlet end of the discharge line is connected to a discharge pipe connected to the discharge port of the discharge casing. The vertical shaft pump further includes a liquid supply receiver arranged between the first liquid supply line and the second liquid supply line, and the first liquid supply line is connected to the arranged to supply a lubricating fluid to a fluid supply receiver, the second fluid supply conduit having an inlet end connected to the fluid supply receiver, and the flow restricting member comprising the 14. The vertical shaft pump of claim 13, attached to the first feed line or the feed receiver. 15. The vertical shaft pump according to claim 14, wherein an overflow pipe is connected to said liquid supply receiver. The vertical shaft pump according to any one of claims 13 to 15, wherein a foreign matter removing device is arranged in said liquid storage tank or said first liquid supply pipe line. The vertical shaft pump according to any one of claims 13 to 16, wherein an on-off valve is provided in said discharge line. The vertical shaft pump according to any one of claims 13 to 17, wherein the discharge line is provided with a pressure reducing valve. The vertical shaft pump according to any one of claims 13 to 18, wherein the liquid storage tank is provided with an air vent valve. The vertical shaft pump according to any one of claims 13 to 19, wherein said liquid storage tank is provided with a water level gauge for detecting the water level in said liquid storage tank. A method for performing a preceding standby operation of a vertical shaft pump, comprising:
a step of opening a first valve provided in a reservoir in which the lubricating liquid is stored and a conduit disposed between the reservoir and the underwater bearing member, and setting a timer;
a step of supplying the lubricating liquid in the liquid storage tank to the underwater bearing member at a flow rate reduced by a flow rate restricting member provided in the conduit;
starting the pump motor of the vertical shaft pump after the time set by the timer;
closing the first valve after stopping the pump motor. The step of supplying the underwater bearing member comprises: flowing the lubricating liquid in the liquid storage tank to a liquid supply receiver provided in the pipe; 22. The method of claim 21, comprising supplying the submersible bearing member with a reduced flow rate by the flow restriction member provided in the section or the conduit. The step of starting the pump motor includes a step of flowing the liquid handled by the vertical shaft pump from the pump casing to the liquid storage tank,
23. A method according to claim 21 or 22, wherein the step of flowing into said reservoir comprises opening a second valve provided in a line connecting said pump casing and said reservoir. 24. The method of claim 23, further comprising closing the second valve when the reservoir is full.

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