JP2017227203A - Pump facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To uniform a maintenance cycle of a plurality of vertical shaft pumps each having a different whole length.SOLUTION: A pump facility 10 includes: vertical shaft pumps 100, 200 having casings 105, 205 each having a different whole length; and a control part 20 driving the pumps from the first vertical shaft pump 100 depending on a water level in a suction water tank 13. The first vertical shaft pump 100 includes a water-injection lubrication type first submerged bearing. The second vertical shaft pump 200 includes a non-water-injection lubrication type second submerged bearing.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pump facility.

  Patent Document 1 discloses a pump facility in which a plurality of vertical shaft pumps having different casing lengths are arranged. In this pump facility, the water level at which drainage is started is set for each vertical pump, and the operation is started in order from the vertical pump having the long overall length according to the water level in the suction water tank.

JP-A-8-61283

  However, the pump facility of Patent Document 1 has different annual drainage operation time for each vertical shaft pump, the longer annual drainage operation time is longer, and the shorter annual drainage operation time is shorter. Each of the vertical shaft pumps is provided with a submerged bearing that is a periodic replacement part that wears in proportion to the operation time. Therefore, since the maintenance time is different for each vertical shaft pump, the management of the pump equipment is complicated.

  An object of the present invention is to equalize maintenance cycles of a plurality of vertical pumps having different overall lengths.

  The pump equipment of the present invention includes a first vertical shaft pump having a first casing suspended in the suction water tank, and a second casing suspended in the suction water tank, and the second casing in the suction water tank. A different drive water level is defined for each of the second vertical pump and the first vertical pump and the second vertical pump, the total length of which is shorter than the total length of the first casing, and depending on the water level in the suction water tank, And a controller that is driven from the first vertical shaft pump. The first vertical shaft pump includes a first submersible bearing of a water injection lubrication type, and the second vertical shaft pump includes a second submersible bearing of a non-water injection lubrication type.

  The first vertical shaft pump provided with the first submersible bearing of the water injection lubrication type is higher in manufacturing cost but has a longer usable period (life) than the second vertical shaft pump provided with the second submersible bearing of the non-water injection lubrication type. . In this pump facility, the first vertical shaft pump having a long overall length and an annual drainage operation time is used as a first submerged bearing of a water injection lubrication type, and the second vertical shaft pump having a short overall length and an annual drainage operation time is a second waterless lubrication type second pump. It is an underwater bearing. Therefore, it is possible to make the maintenance time uniform by matching the bearing replacement years of the first and second vertical shaft pumps including the non-operation time while suppressing the increase in the total cost of the pump equipment. Furthermore, since the optimum type of vertical pump is selected according to the annual drainage operation time, the service life can be extended as compared with the case where all vertical pumps are non-water-lubricated.

  In general, the underwater bearing may fail due to the quality of the discharged liquid (for example, the amount of slurry contained), and the failure probability varies depending on the type of the underwater bearing. Further, since the water quality of the discharged liquid varies depending on the region and the weather, it is impossible to grasp in advance. On the other hand, since the pump installation of this aspect is provided with the 1st and 2nd vertical shaft pump which mounts the 1st and 2nd underwater bearing from which a model differs, even if one vertical shaft pump becomes a state which cannot be drive | operated. The other vertical shaft pump can be operated. Therefore, since the water can be discharged regardless of the water quality, the reliability of the pump equipment can be improved.

  The first vertical shaft pump may include an external water injection mechanism that supplies clean water or purified water as the lubricating liquid to the first submersible bearing. According to this aspect, the first underwater bearing can be cooled by clean water or purified water, and the first underwater bearing can be reliably lubricated. Therefore, since the wear of the first submersible bearing can be significantly reduced, the life of the first vertical shaft pump can be extended.

  The second submersible bearing of the second vertical shaft pump may be non-dustproof. According to this aspect, compared with the first vertical shaft pump, the usable period is short, but the manufacturing cost can be greatly reduced. Therefore, the reliability of the pump equipment can be improved while suppressing an increase in the total cost of the pump equipment by using it as a vertical shaft pump that is driven when a local heavy rain occurs for a short time.

  You may further provide the 3rd vertical shaft pump which has a 3rd casing whose full length is shorter than the said 1st casing and whose full length is longer than the said 2nd casing. The third vertical shaft pump includes a water injection lubrication type third submersible bearing, and a self-water injection mechanism that supplies treated water obtained by purifying a part of pumped water sucked from the suction water tank as the lubricating liquid to the third submersible bearing. It has. According to this aspect, since foreign matters can be prevented from adhering to the underwater bearing due to the treated water, wear of the third underwater bearing can be reduced, and the life of the third vertical shaft pump can be extended. Moreover, since an incidental facility (for example, an external water source or a feed water pump) for supplying the lubricating liquid is not necessary, the manufacturing cost can be reduced as compared with the first vertical shaft pump.

  The self-water injection mechanism is a cyclone separator. Here, the cyclone separator separates the taken pumped water into centrifugal water and sewage containing slurry and the treated water, supplies the treated water to the third underwater bearing, and discharges the sewage to the outside. Therefore, compared with the case where the pumped water is purified by the filter, there is no clogging, and the number of maintenance inspections of the third vertical shaft pump can be reduced.

  A protective tube covering the outer periphery of the rotating shaft disposed in the third casing is provided, and the lubricating liquid is supplied through the protective tube. Here, the vertical shaft with a long overall length is rotatably supported by two or more underwater bearings. According to this aspect, since the lubricating liquid flows through the protective tube, the lubricating liquid can be supplied to all the underwater bearings. Therefore, the wear of all the submersible bearings can be reduced and the life of the vertical shaft pump can be extended.

  You may further provide the 4th vertical shaft pump which has a 4th casing whose full length is shorter than the said 1st casing and whose full length is longer than the said 2nd casing. The fourth vertical shaft pump includes a dust-proof, non-water-filled lubrication type fourth submersible bearing in which a cover for preventing intrusion of foreign matters is disposed. The total length of the fourth casing is shorter than the total length of the third casing. According to this aspect, even a non-water-filled lubrication type underwater bearing can prevent the intrusion of foreign matter, so that it can have a longer life than a non-dust-proof type.

  In addition, the first vertical shaft pump may include a self-water injection mechanism that supplies treated water obtained by purifying a part of pumped water sucked from the suction water tank as the lubricating liquid to the first submersible bearing. In addition, the second submersible bearing of the second vertical shaft pump may be a dust-proof type in which a cover for preventing intrusion of foreign matter is disposed.

  In the pump facility according to the present invention, the first vertical shaft pump having a long overall length is used as a first submersible bearing of a water injection lubrication type, and the second vertical shaft pump having a short overall length is used as a second submersible bearing of a non-water injection lubrication type. The maintenance time can be made uniform. Therefore, management of pump equipment can be improved. In addition, since the optimum type of vertical pump is selected according to the annual drainage operation time, it is possible to extend the service life compared to the case where all vertical pumps are non-water-lubricated.

Schematic which shows the pump installation of this embodiment. The chart which shows the characteristic for every vertical shaft pump of pump equipment. Sectional drawing which shows the 1st vertical shaft pump of FIG. The expanded sectional view which shows a part of FIG. The expanded sectional view which shows the other part of FIG. Sectional drawing which shows the 2nd vertical shaft pump of FIG. The expanded sectional view which shows a part of FIG. Sectional drawing which shows the 3rd vertical shaft pump of FIG. The expanded sectional view which shows a part of FIG. The expanded sectional view which shows a part of FIG. 8A. FIG. 8B is a cross-sectional view showing a part of FIG. 8A. The conceptual diagram which shows the self-water-injection mechanism of a 3rd vertical shaft pump. Sectional drawing which shows the modification of a 3rd vertical shaft pump. Sectional drawing which shows the 4th vertical shaft pump of FIG. The expanded sectional view which shows a part of FIG. FIG. 12B is a cross-sectional view showing a part of FIG. 12A.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a pump facility 10 according to the present embodiment. The pump facility 10 includes two or more (four in this embodiment) vertical shaft pumps 100 to 400. These vertical shaft pumps 100 to 400 include pump casings 105 to 405 having different overall lengths. These pump casings 105 to 405 are fixed to the installation floor 12 and are suspended in the suction water tank 13 below the installation floor 12. In this embodiment, the management of the pump facility 10 is improved by making the maintenance times of the plurality of vertical pumps 100 to 400 uniform.

(Pump equipment overall configuration)
As shown in FIG. 1, the total length of the pump casings 105 to 405 is intended to be the dimension in the suction water tank 13 from the bottom surface of the installation floor 12 to the suction ports 106 to 406 (total length in the tank). Therefore, for example, when pump casings having the same actual size from the lower end to the upper end are used and the dimensions of the portion hanging down in the installation floor 12 are made different, this aspect is included in pump casings having different overall lengths. The first to fourth vertical shaft pumps 100 to 400 of the present embodiment use pump casings 105 to 405 having different actual sizes from the lower end to the upper end, and are fixed so that the dimensions protruding upward from the installation floor 12 are the same. Has been.

  Specifically, the first pump casing 105 located at the left end in FIG. 1 has the longest total length L as compared with the other pump casings 205 to 405. The second pump casing 205 located at the right end in FIG. 1 has the shortest overall length compared to the other pump casings 105, 305, and 405, and is shorter than half of the total length L of the first pump casing 105. The third pump casing 305 adjacent to the right of the first pump casing 105 is shorter than the total length L of the first pump casing 105 and longer than the total length of the second pump casing 205. The third pump casing 305 is longer than half of the total length L of the first pump casing 105. The fourth pump casing 405 adjacent to the left of the second pump casing 205 is shorter than the entire length of the third pump casing 305 and longer than the entire length of the second pump casing 205. Further, the fourth pump casing 405 is shorter than half of the total length L of the first pump casing 105.

  The first to fourth vertical shaft pumps 100 to 400 include first to fourth drive motors 102 to 402, respectively. These drive motors 102-402 are controlled by the control apparatus 20 connected so that communication was possible. In the control device 20, different driving water levels WL1 to WL4 are set according to the total length of the vertical shaft pumps 100 to 400. When the control device 20 determines that the inside of the suction water tank 13 has reached the driving water levels WL1 to WL4 based on a signal from a water level sensor (not shown), the vertical pumps 100 to 400 are driven from the longer full length, and the water in the suction water tank 13 is Is discharged downstream.

  Specifically, when the water in the suction tank 13 exceeds the first drive water level WL1 due to rain, the control device 20 starts the operation of the first vertical shaft pump 100. When the amount of water flowing into the suction water tank 13 is larger than the amount of water discharged by the first vertical pump 100 and exceeds the third driving water level WL3 higher than the first driving water level WL1, the control device 20 operates the third vertical pump 300. To start. When the amount of water flowing into the suction tank 13 is larger than the amount of drainage by the vertical pumps 100 and 300 and exceeds the fourth drive water level WL4 higher than the third drive water level WL3, the control device 20 operates the fourth vertical pump 400. To start. When the amount of water flowing into the suction water tank 13 is larger than the amount of drainage by the vertical pumps 100, 300, and 400 and exceeds the second driving water level WL2 higher than the fourth driving water level WL4, the control device 20 causes the second vertical shaft. The operation of the pump 200 is started.

  As shown in FIG. 2, in the pump facility 10 configured as described above, the annual drainage operation time differs for each of the vertical shaft pumps 100 to 400. The annual drainage operation time becomes longer when the total length of the vertical shaft pumps 100 to 400 becomes longer, and becomes shorter when the total length of the vertical shaft pumps 100 to 400 becomes shorter. In this example, based on the annual drainage operation time of the first vertical pump 100, the annual drainage operation time of the third vertical pump 300 is approximately 1/10, and the annual drainage operation time of the fourth vertical pump 400 is approximately 1/100. The annual drainage operation time of the second vertical shaft pump 200 is approximately 1/500.

  Referring to FIGS. 3, 5, 7, and 11, the vertical shaft pumps 100 to 400 include submersible bearings 140 to 440 that are regular replacement parts that wear in proportion to the operation time. The maintenance including the replacement work of the underwater bearings 140 to 440 is large because it is necessary to stop the pump facility 10 and pull out the target vertical shaft pumps 100 to 400 from the installation floor 12. When the maintenance time is different for each of the vertical shaft pumps 100 to 400, not only the maintenance frequency of the pump facility 10 is increased, but also the management is complicated. Therefore, in this embodiment, the maintenance cycle of the vertical shaft pumps 100 to 400 having different operation times can be made uniform.

  As shown in FIGS. 1 and 2, the vertical pumps 100 to 400 of the present embodiment include the first and third vertical pumps 100 and 300 included in the longer overall length and the second vertical pump included in the shorter overall length. And the fourth vertical shaft pumps 200 and 400. The suction ports 106 to 406 approach the bottom surface 14 of the suction water tank 13 as the overall length of the pump casings 105 to 405 increases. Since the suction ports 106 and 306 are close to the bottom surface 14, the first and third vertical shaft pumps 100 and 300 often suck slurry that has settled on the bottom surface 14. In addition, the second and fourth vertical pumps 200 and 400 are less likely to suck slurry because the suction ports 206 and 406 are separated from the bottom surface 14. When a large amount of slurry is contained in the pumped water sucked from the suction water tank 13, since the abrasive wear occurs in the underwater bearings 140 to 440, the maintenance time is advanced. Therefore, the first and third vertical shaft pumps 100 and 300 use water-lubricated submersible bearings 140 and 340 to which a lubricating liquid is supplied, and the second and fourth vertical shaft pumps 200 and 400 include a lubricating liquid. No-water-lubricated submersible bearings 240 and 440 are not used.

  Referring to FIGS. 3 and 7, the lubrication-type submersible bearings 140 and 340 are of a type that prevents intrusion of foreign substances contained in the pumped water by forcibly supplying the lubricating liquid by the water injection mechanisms 150 and 350. Say things. Referring to FIGS. 5 and 11, the non-water-lubricated submersible bearings 240 and 440 are of a type that does not have a water-injecting mechanism and does not forcibly supply the lubricant to the submerged bearings 240 and 440. Say. It should be noted that pumped water enters the non-water-lubricated submersible bearings 240 and 440 during drainage operation, but this natural penetration of pumped water is not included in the water-filled lubricated type.

  The vertical pumps 100 and 300 provided with the submerged bearings 140 and 340 of the water injection lubrication type have higher initial costs than the vertical pumps 200 and 400 provided with the submerged bearings 240 and 440 of the non-water injection lubrication type. In this embodiment, half of the vertical shaft pumps 100 and 300 are of a water injection lubrication type, and the remaining vertical shaft pumps 200 and 400 are of a non-water injection lubrication type, thereby suppressing an increase in the total cost of the pump facility 10. In addition, since the water injection lubrication type underwater bearings 140 and 340 can prevent foreign matter from entering by water injection, the bearing life (usable period) is longer than that of the non-water injection lubrication type underwater bearings 240 and 440. The vertical pumps 100 and 300 having a long annual drainage operation time are made into a lubrication type, and the vertical pumps 200 and 400 having a short annual drainage operation time are made into a non-watering lubrication type, so The exchange years are matched.

  More specifically, the water injection mechanisms 150 and 350 used in the water injection lubrication type underwater bearings 140 and 340 include an external water injection type that supplies fresh water or purified water as a lubricating liquid, and treated water that has purified a part of pumped water as the lubricating liquid. It is classified into the self-water injection type that supplies The underwater bearing 140 using the external water injection type water injection mechanism 150 has a long bearing life because fresh water or purified water containing no foreign matter is used. In addition, the self-flowing water injection mechanism 350 does not require the water storage tank 152 and the water supply pump 154 which are incidental facilities, and thus the initial cost is low.

  Therefore, the first submersible bearing 140 of the external water injection lubrication type by the external water injection mechanism 150 is used for the first vertical shaft 100 having the longest overall length and the longest annual drainage operation time. Further, as compared with the first vertical shaft pump 100, the third vertical shaft pump 300 having a short overall length and a short annual drainage operation time uses the self-water-lubricating third submersible bearing 340 by the self-water injection mechanism 350. Thereby, the total cost of the pump equipment 10 can be reduced compared with the case where two external water-lubricated vertical pumps 100 are arranged.

  Non-water-lubricated submersible bearings 240 and 440 are so-called dry bearings and are self-lubricated by pumping water when the vertical shaft pumps 200 and 400 are operated. It is a self-lubricating plain bearing that functions as a bearing. The non-water-lubricated submersible bearings 240 and 440 are classified into a dust-proof type having a protective cover 450 that prevents intrusion of foreign matters contained in pumped water and a non-dust-proof type having no protective cover. The dust-proof underwater bearing 440 has a higher initial cost but a longer bearing life than the non-dust-proof bearing.

  Therefore, the non-dust-proof non-water-lubricated submersible bearing 240 is used in the second vertical shaft 200 having the shortest overall length and the short annual drainage operation time. Further, the dust-proof non-water-lubricated submersible bearing 440 is used for the fourth vertical pump 400 that is longer than the second vertical pump 200 and has a long annual drainage operation time. Thereby, the total cost of the pump equipment 10 can be reduced as compared with the case where two dustproof non-water-lubricated vertical pumps 400 are arranged.

  The underwater bearings 140 to 440 may fail due to the quality of the liquid to be discharged (for example, the amount of slurry contained), and the failure probability varies depending on the type of the underwater bearings 140 to 440. Furthermore, since the water quality of the liquid to be discharged varies depending on the region and the weather, it is impossible to grasp in advance. On the other hand, in this embodiment, since the vertical pumps 100 to 400 equipped with the submersible bearings 140 to 440 of different types are provided, even if a specific vertical pump becomes inoperable, It is possible to drive. That is, since the water can be drained regardless of the water quality, the reliability of the pump facility 10 can be improved. In addition, by selecting the optimum type of submersible bearings 140 to 440 according to the annual drainage operation time of the vertical shaft pumps 100 to 400, it is possible to extend the life of the pump facility 10 as a whole while suppressing the total cost of the pump facility 10. be able to.

  Next, an example of the first to fourth vertical shaft pumps 100 to 400 will be described.

  As the first vertical shaft pump 100 provided with the external water-lubricated submersible bearing 140, the vertical shaft disclosed in Japanese Patent No. 3079177, Japanese Patent No. 4709878, or Japanese Patent No. 5422711 can be used. As the second vertical shaft pump 200 provided with the non-dust-proof non-water-filled lubrication type second underwater bearing 240, a vertical shaft pump disclosed in Japanese Patent Laid-Open No. 2015-200274 can be used. As the third vertical shaft pump 300 including the self-water-filling lubricated third submersible bearing 340, the vertical shaft disclosed in Japanese Patent Application No. 2006-061579 or Japanese Patent Application No. 2006-052845 can be used. As the fourth vertical shaft pump 400 provided with the dust-proof non-water-filled lubrication type fourth underwater bearing 440, the vertical shaft pump disclosed in Japanese Patent No. 3955839 can be used.

(Common configuration of the first to fourth vertical shaft pumps)
As shown in FIGS. 3, 5, 7, and 11, rotary shafts 108 to 408 are rotatably disposed in the vertical shaft pumps 100 to 400 along the axis of the pump casings 105 to 405. Drive motors 102 to 402 are connected to the rotating shafts 108 to 408 at ends that protrude outward from the pump casings 105 to 405. Further, impellers 110 to 410 that are rotated by driving of the drive motors 102 to 402 are connected to the rotating shafts 108 to 408 at ends positioned in the pump casings 105 to 405.

  The pump casings 105 to 405 are provided with cylindrical casing hubs 116 to 416 via guide vanes 115 to 415 so as to be positioned above the impellers 110 to 410. The casing hubs 116 to 416 are provided with bearing sleeves 117 to 417 through which the rotary shafts 108 to 408 are inserted and to which the underwater bearings 140 to 440 are fixed. Further, the upper end openings of the casing hubs 116 to 416 are closed by substantially conical cylindrical closing members 118 to 418. The blocking members 118 to 418 are also provided with bearing sleeves 119 to 419 to which the underwater bearings 140 to 440 are fixed.

  Further, cylindrical insertion members 130 to 430 are arranged in the upper ends of the pump casings 105 to 405 through which the rotary shafts 108 to 408 pass. In the insertion members 130 to 430, shaft sealing casings 132 to 432 having mechanical seals are arranged.

  As shown in FIGS. 4A, 6, 8 </ b> B, and 12 </ b> A, the submersible bearings 140 to 440 of the vertical shaft pumps 100 to 400 include sliding bodies 141 to 441 that are disposed so as to surround the rotating shafts 108 to 408. ing. The sliding bodies 141 to 441 are fixed to cover cases 142 to 442 for fixing to the casing hubs 116 to 416.

(Details of the first vertical shaft pump)
As shown in FIG. 3, a bearing holder 136 is disposed in the first pump casing 105 of the first vertical shaft pump 100 via a guide vane 135 so as to be positioned above the casing hub 116. The first underwater bearing 140 is also disposed in the bearing holder 136.

  An external water injection mechanism 150 for supplying the lubricating liquid CW to the first submersible bearing 140 is disposed outside the first pump casing 105. The external water injection mechanism 150 includes a water storage tank 152 that stores fresh water or purified water as the lubricating liquid CW, and a water supply pump 154 that supplies the lubricating liquid CW in the water storage tank 152 to the first submersible bearing 140. . Further, the external water injection mechanism 150 includes a lubricating liquid flow path 158 for supplying the lubricating liquid CW to the first underwater bearing 140.

  The water storage tank 152 and the water supply pump 154 are disposed on the installation floor 12. The water storage tank 152 always stores a fixed amount of the lubricating liquid CW from a water source (not shown). The feed water pump 154 is driven by the control device 20 when the first vertical shaft pump 100 is driven. Between the water storage tank 152 and the water supply pump 154, a check valve 156 that allows the flow of the lubricating liquid CW from the water storage tank 152 toward the water supply pump 154 is disposed.

  The lubricating liquid flow path 158 includes a water supply pipe 160, a protection pipe 162, and a drain pipe 166. The water supply pipe 160 connects the water supply pump 154 and the shaft seal casing 132 at the upper end of the pump casing 105. Referring to FIG. 4B, the shaft seal casing 132 is provided with a connection portion 133 to which the water supply pipe 160 is connected.

  The protective tube 162 covers the outer periphery of the rotating shaft 108 and connects the insertion member 130 and the casing hub 116 via the bearing holder 136. The protective tube 162 includes a first portion 163 having one end connected to the lower end of the insertion member 130 and the other end connected to the upper end of the bearing holder 136. The protective tube 162 includes a second portion 164 having one end connected to the lower end of the bearing holder 136 and the other end connected to the closing member 118 at the upper end of the casing hub 116.

  The drain pipe 166 communicates the casing hub 116 with the outside (atmosphere) of the pump casing 105. Referring also to FIG. 4A, the casing hub 116 is provided with a connecting pipe portion 121 that protrudes from the bearing sleeve 117 to the peripheral wall of the first pump casing 105. The bearing sleeve 117 is provided with a communication portion 120 and the first underwater bearing 140 is provided with a through portion 143 so as to correspond to the connecting pipe portion 121. One end of a drain pipe 166 is connected to the outer end of the connection pipe portion 121. The other end of the drain pipe 166 is piped so as to open at the top of the suction water tank 13.

  In the first vertical shaft pump 100, the water supply pump 154 is driven by the control device 20, whereby the lubricating liquid CW in the water storage tank 152 is supplied into the protective pipe 162. As a result, the lubricating liquid CW passes between the rotary shaft 108 and the protective tube 162 and reaches the first underwater bearing 140 of the bearing holder 136 and passes between the rotary shaft 108 and the sliding body 141. Next, the lubricating liquid CW flows between the rotating shaft 108 and the protective tube 162 and flows into the casing hub 116. The lubricating liquid CW that has passed through the underwater bearing 140 of the casing hub 116 reaches the drain pipe 166 through the connection pipe portion 121, and is discharged into the suction water tank 13 through the drain pipe 166.

  In the first vertical shaft pump 100 configured as described above, the first underwater bearing 140 can be cooled by the lubricating liquid CW, and the first underwater bearing 140 can be reliably lubricated. Further, all the first underwater bearings 140 can be reliably lubricated by the protective tube 162. Therefore, since the wear of the first submersible bearing 140 can be significantly reduced, the life of the first vertical shaft pump 100 can be extended. Moreover, since the fine water or clean water which is the lubricating liquid CW does not include fine foreign matter, it is possible to reliably prevent the abrasive wear from occurring in the first underwater bearing 140.

  Note that the external water injection lubrication-type first vertical pump 100 is not limited to the above-described configuration, and various modifications are possible. For example, the water supply pump 154 may be connected to the connecting pipe portion 121 of the casing hub 116, and the lubricating liquid CW may be flowed from the bottom to the top. Further, the lubricating liquid CW may be directly supplied to the casing hub 116 and the first underwater bearing 140 of the bearing holder 136 without using the protective tube 162.

(Details of the second vertical shaft pump)
As shown in FIG. 5, the second vertical shaft pump 200 is not provided with a bearing holder unlike the first vertical shaft pump 100. Referring to FIG. 6, the upstream side in the flow direction of the second submersible bearing 240 is exposed in the pump casing 205, and the sucked water can enter the gap between the sliding body 241 and the rotating shaft 208. Further, the second vertical shaft pump 200 is not provided with a water injection mechanism like the first vertical shaft pump 100.

  In the second vertical shaft pump 200 configured as described above, the bearing life of the second submersible bearing 240 is short, but since there are no incidental equipment and accessory parts, the manufacturing cost can be significantly reduced. Therefore, the second vertical shaft pump 200 is effective when it is driven only when a heavy rain occurs for a short time. Thereby, the reliability of the pump equipment can be improved while suppressing an increase in the total cost of the pump equipment 10.

(Details of the third vertical shaft pump)
As shown in FIG. 7, the third vertical shaft pump 300 is provided with a bearing holder 336 via a guide vane 335, similarly to the first vertical shaft pump 100, and the third underwater bearing 340 is also provided on this bearing holder 336. Has been. Further, similarly to the first vertical shaft pump 100, the third vertical shaft pump 300 is provided with a protective tube 362 that covers the outer periphery of the rotary shaft 308. The protective tube 362 includes a first portion 363 that connects the insertion member 330 and the bearing holder 336, and a second portion 364 that connects the bearing holder 336 and the casing hub 316.

  Referring also to FIG. 8A, the third vertical shaft pump 300 is provided with a self-water injection mechanism 350 for supplying the lubricating liquid TW to the third underwater bearing 340 inside the third pump casing 305. The self water injection mechanism 350 is a cyclone separator 352 provided on the impeller 310. The cyclone separator 352 is a filtering unit that takes in a part of the pumped water PW discharged by the third vertical shaft pump 300 and can separate the pumped water PW into treated water and sewage DW that are the lubricating liquid TW. First, the principle of the cyclone separator 352 will be described using the conceptual diagram of FIG.

  The cyclone separator 352 includes a conical container 370 having a cylindrical body whose diameter gradually increases from the lower part to the upper part. The upper end opening of the conical container 370 is closed by a lid member 371. A pumping water inlet 372 is provided on the outer periphery of the conical vessel 370. A cylindrical sewage outlet 373 is provided at the lower end of the conical container 370, and a cylindrical treated water outlet 374 is provided in the lid member 371.

  The pumped water PW flows into the conical container 370 from the pumped water inlet 372 with the direction in contact with the outer periphery of the conical container 370 as the inflow direction. Then, the pumped water PW swirls along the wall surface of the conical container 370 (see swirl flow RF). Thereby, the pressure near the wall surface of the conical container 370 increases, and the pressure near the central axis of the conical container 370 decreases. Further, in the vicinity of the central axis of the conical container 370, an upward flow UF is generated at the upper portion, and a downward flow is generated at the lower portion.

  The foreign matter contained in the pumped water PW is separated from the liquid by centrifugal force due to the swirling flow RF, settles downward while rotating, and is discharged as sewage DW from the sewage outlet 373 to the outside of the conical container 370. Further, the treated water (lubricant TW) from which the solid matter has been separated is discharged from the treated water outlet 374 to the outside of the conical container 370 by the upward flow UF. However, minute foreign matter that does not cause wear in the underwater bearing 340 may be discharged from the treated water outlet 374 on the upward flow UF.

  As shown in FIGS. 8A to 8C, such a cyclone separator 352 is provided in a hollow hub 311 portion of the impeller 310. Specifically, the impeller 310 includes a conical hub 311 having a diameter that gradually increases from the bottom upward, and a plurality of blade plates 312 that protrude radially outward from the hub 311. Further, the hub 311 is provided with a boss 313 for connecting to the rotating shaft 308.

  The upper end opening of the hub 311 is covered by the bottom wall 322 of the casing hub 316. A lid 323 positioned at the upper end opening of the hub 311 is fixed to the bottom wall 322. A plurality (four in this embodiment) of inflow pipes 324 are arranged on the lid 323. As shown most clearly in FIG. 8B, the inflow pipe 324 is disposed so as to extend in a direction in contact with the outer periphery of the lid 323. The outer end side of the inflow pipe 324 penetrates the casing hub 316, and the penetrating portion is sealed in a liquid-tight manner. An inflow port 325 that is an outer end of the inflow pipe 324 is opened outside the casing hub 316 so as to face the rotation direction A of the impeller 310. An outlet 326 that is an inner end of the inflow pipe 324 opens above the hub 311. In addition, a gap 327 having a set interval is formed between the lid 323 and the rotating shaft 308.

  Of the impeller 310 and the casing hub 316, the conical hub 311 also functions as the conical container 370 of the cyclone separator 352. The lid body 323 also functions as the lid member 371 of the cyclone separator 352. In addition, the inflow pipe 324 disposed in the lid 323 also functions as the pumped water inlet 372 of the cyclone separator 352. A gap 327 between the lid 323 and the rotating shaft 308 also functions as the treated water outlet 374 of the cyclone separator 352. Further, a through hole 314 is provided in the lower portion of the peripheral wall of the hub 311, and this through hole 314 also functions as the sewage outlet 373 of the cyclone separator 352.

  When the impeller 310 rotates, the pumped water PW is sucked up in the pumping flow path between the pump casing 305 and the casing hub 316 while turning in the same direction as the rotation direction A of the impeller 310. Thereby, a part of the pumped water PW is taken into the hub 311 from the inlet 325 of the inflow pipe 324 facing the flow direction of the pumped water PW, and swirls along the wall surface of the hub 311. Further, the pumped water PW in the hub 311 is separated into the treated water and the sewage DW as the lubricating liquid TW with high efficiency because the turning speed is accelerated by the rotation of the hub 311.

  The separated sewage DW flows out through the through hole 314 and into the pumped water flow path. 7 and 8A, the through hole 314 penetrates along the flow direction of the pumped water PW, and the flow direction of the pumped water PW and the outflow direction of the sewage DW are opposite to each other. If the pressure near the suction port 306 is P0, the pressure near the upper side of the vane plate 312 is P1, and the pressure inside the hub 311 is P2, the pressure P2 is higher than the pressure P0, and the pressure P1 is higher than the pressure P2 (P0 < P2 <P1). Therefore, the pumped water PW does not flow into the hub 311 through the through hole 314.

  The separated lubricating liquid TW rises around the boss 313 of the impeller 310 and flows toward the casing hub 316 through the gap 327. Then, the lubricating liquid TW flows into the casing hub 316 through the gap between the third underwater bearing 340 and the rotating shaft 308. When the inside of the casing hub 316 is filled with the lubricating liquid TW, the lubricating liquid TW flows out of the casing hub 316 through the gap between the third underwater bearing 340 of the closing member 318 and the rotary shaft 308.

  Next, the lubricating liquid TW flows into the bearing holder 336 through the protective tube 362 and passes through the gap between the third underwater bearing 340 of the bearing holder 336 and the rotating shaft 308. Thereafter, the water is discharged to the suction water tank 13 through the protective tube 362, the shaft seal casing 332, and the drain tube 366. The drain pipe 366 is piped so that one end is connected to the connecting portion of the shaft seal casing 332 and the other end is opened at the upper part of the suction water tank 13.

  In the third vertical shaft pump 300 thus configured, it is possible to prevent foreign matters from adhering to the third underwater bearing 340 by the lubricating liquid TW made of treated water. Further, all the first underwater bearings 140 can be reliably lubricated by the protective tube 362. Therefore, the wear of the third submersible bearing 340 can be reduced, and the life of the third vertical shaft pump 300 can be extended. In addition, since the third vertical shaft pump 300 does not require an auxiliary facility (for example, an external water source or a water supply pump) for supplying the lubricating liquid TW, the manufacturing cost can be reduced as compared with the first vertical shaft pump 100. In addition, since the self-water injection mechanism 350 includes the cyclone separator 352, there is no clogging as compared with the case where the pumped water is purified by a filter, so that the number of maintenance inspections of the third vertical shaft pump 300 can be reduced.

  Note that the third vertical shaft pump 300 of the self-water injection lubrication type is not limited to the above-described configuration, and various modifications can be made. For example, the structure for taking the pumped water PW into the hub 311 can be changed as desired. As shown in FIG. 10, the cyclone separator 352 constituting the self-water injection mechanism 350 may be branched and connected to a portion (for example, a discharge pipe) located on the installation floor 12 in the third pump casing 305. In this case, one end of the water supply pipe 360 is connected to the treated water outlet 374 of the cyclone separator 352, and the other end of the water supply pipe 360 is connected to the shaft seal casing 332. The water supply pipe 360 is provided with a check valve 356 that allows the flow of the lubricating liquid CW from the cyclone separator 352 toward the shaft seal casing 332. Further, the third casing hub 316 is formed with a connecting pipe portion 321 similar to the connecting pipe portion 121 of the first casing hub 116, and a drain pipe 366 is connected to the connecting pipe portion 321. Even if it does in this way, the effect | action and effect similar to the above can be acquired.

(Details of 4th vertical shaft pump)
As shown in FIG. 11, in the fourth vertical pump 400, a bearing holder 436 is disposed via a guide vane 435, as in the first vertical pump 100, and an underwater bearing 440 is also disposed in this bearing holder 436. Yes. This vertical shaft pump 400 is provided with a protective cover 450 that prevents foreign matter contained in the pumped water from entering the fourth underwater bearing 440 so as to be positioned below the casing hub 416 and the bearing holder 436. The upper end of the fourth underwater bearing 440 is covered with the bearing sleeve and the bearing holder 436, and the lower end of the fourth underwater bearing 440 is covered with a protective cover 450.

  The protective cover 450 is fixed to the rotary shaft 408 in the pump casing 405 so as to be located upstream (in other words, lower) in the pumping water flow direction with respect to the fourth submersible bearing 440. Referring also to FIG. 12A, the protective cover 450 has a bottomed cylindrical shape as a whole, and includes a bottom wall 451 fixed to the rotation shaft 408 and a cylindrical peripheral wall 452 surrounding the rotation shaft 408. Yes. A liquid storage chamber 454 having an open upper end is formed between the outer periphery of the rotating shaft 408 and the peripheral wall 452.

  A vane member 457 for removing foreign substances contained in the pumped water is disposed in the liquid storage chamber 454. The vane member 457 is fixed to the cover case 442 of the underwater bearing 440. Referring to FIG. 12B, the vane member 457 includes a plurality of guide plates 458 extending in the radial direction. The guide plate 458 is inclined along the rotation direction of the rotation shaft 408 and the protective cover 450.

  An annular lid 460 is fixed to the upper end opening of the protective cover 450. A gap 462 having a predetermined interval is formed between the lid 460 and the rotating shaft 408 (cover case 442). The liquid storage chamber 454 in the protective cover 450 and the fourth pump casing 405 communicate with each other through the gap 462.

  When the fourth vertical shaft pump 400 is operated, the protective cover 450 rotates together with the rotating shaft 408. Then, the pumped water in the liquid storage chamber 454 rotates in the same direction as the protective cover 450 by centrifugal force. As a result, the foreign matter contained in the pumped water is guided toward the outside and upward of the liquid storage chamber 454 by the guide plate 458. Thereafter, the foreign matter is discharged from the liquid storage chamber 454 to the pump casing 405 through the gap 462 between the lid 460 and the cover case 442. As a result, foreign matter can be prevented from entering the fourth underwater bearing 440.

  When the operation of the fourth vertical shaft pump 400 is stopped, only clean pumped water from which foreign matters are removed remains in the liquid storage chamber 454. Even if the operation of the vertical shaft pump 400 is resumed and pumped water suddenly flows into the pump casing 405, clean pumped water stored in the liquid storage chamber 454 flows into the fourth submersible bearing 440. Foreign matter does not enter the bearing 440.

  In the fourth vertical shaft pump 400 configured as described above, foreign matter can be prevented from entering the third underwater bearing 440. Therefore, compared with the non-dust-proof second underwater bearing 240, the occurrence of abrasive wear is suppressed and the life is extended. Can be achieved.

  The second and fourth vertical pumps 200 and 400 including the non-water-lubricated submersible bearings 240 and 440 are not limited to the above-described configuration, and various modifications can be made. For example, the upper end openings of the casing hubs 216 and 416 may be opened in these vertical shaft pumps 200 and 400 without using the closing members 218 and 418. Further, the fourth vertical shaft pump 400 may not include the bearing holder 436.

(Comparison between pump products of the invention and conventional products)
As shown in FIG. 2, the bearing replacement years were compared using the inventive pump facility 10 and the conventional pump facility. The bearing replacement years are obtained by dividing (dividing) the bearing life by the annual drainage operation time. In the pump facility 10 according to the present invention, the vertical shaft pumps 100 to 400 using the first to fourth submersible bearings 140 to 440 are arranged as in the above embodiment. All conventional pump facilities are equipped with vertical shaft pumps using dust-proof, non-water-lubricated submersible bearings.

  The bearing life of the conventional first vertical shaft pump is 0.2, and it is necessary to replace the underwater bearing 440 five times a year. The bearing replacement years of the conventional second vertical shaft pump is 100.0, which is longer than the life of the pump equipment itself, so it can be said that the design is excessive. The bearing replacement years of the conventional third vertical shaft pump are 2.2, and it is necessary to replace the underwater bearing 440 once every two years. The bearing replacement years of the conventional 4th vertical shaft pump is 19.2, which is generally reasonable.

  On the other hand, the bearing replacement years of the product of the present invention are 18.9 for the first vertical pump 100, 20.0 for the second vertical pump 200, and 21.7 for the third vertical pump 300. The fourth vertical shaft pump 400 is 19.2. That is, the bearing replacement years of all the vertical pumps 100 to 400 are around 20 years, which are almost the same, so that the submersible bearings 140 to 440 of all the vertical pumps 100 to 400 can be replaced with one maintenance. it can. Therefore, the management of the pump facility 10 can also be improved.

  Next, the cost of the pump facility 10 of the present invention was examined. In FIG. 2, it represents with the index | index on the basis of the 2nd vertical shaft pump 200 with the cheapest manufacturing cost. The initial cost increases in the order of the second vertical pump 200, the fourth vertical pump 400, the third vertical pump 300, and the first vertical pump 100. However, the first vertical shaft pump 100 of the invention can be said to have a good relative evaluation of the operation cost in consideration of the work cost and the part cost at the time of maintenance as compared with the conventional product that requires parts replacement five times a year. In addition, it can be said that the third vertical shaft pump 300 of the invention is good in the relative evaluation of the operating cost as compared with the conventional product that requires replacement of parts once every two years. And since the optimal type | mold vertical pump 100-400 is selected according to the annual drainage operation time, compared with the case where all the vertical pumps are made into a non-pouring lubrication type | mold, a lifetime improvement is possible.

  In addition, the pump installation 10 of this invention is not limited to the structure of the said embodiment, A various change is possible.

  For example, the first vertical pump 100 having the longest overall length may be provided with the self-water injection mechanism 350 shown in FIGS. 7 to 10 and the first submersible bearing 100 may be a self-water injection lubrication type. In this case, an external water-lubricated submersible bearing is not used for other vertical pumps having a shorter overall length than the first vertical pump 100. Even in this case, the maintenance cycle for each vertical pump can be made uniform.

  Further, the second vertical shaft pump 200 having the shortest overall length may be provided with a protective cover 450 shown in FIGS. 11 to 12B, and the second underwater bearing 200 may be a dust-proof non-water-filled lubrication type. In this case, the non-dust-proof non-water-lubricated submersible bearing is not used for other vertical pumps having a longer overall length than the second vertical pump 200. Even in this case, the maintenance cycle for each vertical pump can be made uniform.

  Further, the number of vertical pumps arranged in the pump facility 10 may be two, three, or five or more. In the case of using only two units, the first submerged bearing of the water injection lubrication type is disposed on the longer total length, and the second submerged bearing of the non-water injection lubrication type is disposed on the shorter total length. When three or five or more are installed, the number of water-lubricated vertical pumps 100 and 300 and the number of non-water-lubricated vertical pumps 200 and 400 are not simply determined by the number of units. It is preferable to determine the total length of the pump casing to be installed.

  Moreover, since the vertical shaft pump using the external water injection mechanism 150 can always supply a lubricating liquid composed of fresh water or purified water, the drive motor is driven even when the suction water tank 13 does not reach the drive water level. It may be a standby type.

DESCRIPTION OF SYMBOLS 10 ... Pump equipment 12 ... Installation floor 13 ... Suction water tank 14 ... Bottom 20 ... Control apparatus (control part)
DESCRIPTION OF SYMBOLS 100-400 ... Vertical shaft pump 102-402 ... Drive motor 105-405 ... Pump casing 106-406 ... Suction port 108-408 ... Rotating shaft 110-410 ... Impeller 115-415 ... Guide vane 116-416 ... Casing hub 117-417 ... Bearing sleeve 118-418 ... Blocking member 119-419 ... Bearing sleeve 130-430 ... Penetration member 132-432 ... Shaft seal casing 135-435 ... Guide vane 136-436 ... Bearing holder 140-440 ... Underwater bearing 141-441 ... Slider 142 to 442 ... Cover case 120 ... Communication part 121 ... Connection pipe part 133 ... Connection part 143 ... Passing part 150 ... External water injection mechanism 152 ... Water storage tank 154 ... Water supply pump 156 ... Check valve 158 ... Lubricant flow path 160 ... Water supply pipe 162 ... Protection pipe 63 ... 1st part 164 ... 2nd part 166 ... Drainage pipe 311 ... Hub 312 ... Blade plate 313 ... Boss 314 ... Through-hole 321 ... Connection pipe part 322 ... Bottom wall 323 ... Cover body 324 ... Inflow pipe 325 ... Inflow pipe 326 ... Outlet 327 ... Gap 350 ... Self-water injection mechanism 352 ... Cyclone separator 356 ... Check valve 360 ... Water supply pipe 362 ... Protective pipe 363 ... First part 364 ... Second part 366 ... Drain pipe 370 ... Conical container 371 ... Lid Member 372 ... Pumped water inlet 373 ... Sewage outlet 374 ... Treated water outlet 450 ... Protective cover 451 ... Bottom wall 452 ... Peripheral wall 454 ... Storage chamber 457 ... Vane member 458 ... Guide plate 460 ... Lid 462 ... Gap

Claims (10)

A first vertical shaft pump having a first casing suspended in the suction water tank;
A second vertical pump having a second casing suspended in the suction water tank, wherein the total length of the second casing in the suction water tank is shorter than the total length of the first casing;
A different drive water level is defined for each of the first vertical pump and the second vertical pump, and includes a control unit that is driven from the first vertical pump according to the water level in the suction water tank,
The first vertical shaft pump includes a first submersible bearing of a water injection lubrication type,
The second vertical shaft pump is a pump facility including a non-water-filled lubrication type second submersible bearing.   The said 1st vertical shaft pump is a pump installation of Claim 1 provided with the external water injection mechanism which supplies fresh water or purified water to the said 1st submersible bearing as said lubricating liquid.   The pump equipment according to claim 1 or 2, wherein the second submersible bearing of the second vertical shaft pump is non-dust-proof. A third vertical shaft pump having a third casing that is shorter than the first casing and shorter than the second casing;
The third vertical shaft pump
A water-lubricated third underwater bearing;
4. The self-water injection mechanism according to claim 1, further comprising a self-water injection mechanism that supplies treated water obtained by purifying a part of pumped water sucked from the suction water tank as the lubricating liquid to the third submersible bearing. Pumping equipment.   The pump equipment according to claim 4, wherein the self-water injection mechanism is a cyclone separator.   The pump equipment according to claim 4 or 5 provided with a protection pipe which covers the perimeter of a rotating shaft arranged in said 3rd casing, and said lubricating fluid is supplied through said inside of said protection pipe. A fourth vertical shaft pump having a fourth casing having a total length shorter than the first casing and a total length longer than the second casing;
The said 4th vertical shaft pump is a pump installation of any one of Claim 1 to 6 provided with the 4th underwater bearing of a dust-proof non-water-filling lubrication type | mold with which the cover which prevents the penetration | invasion of a foreign material is arrange | positioned.   The pump equipment according to claim 7, wherein the total length of the fourth casing is shorter than the total length of the third casing.   The said 1st vertical shaft pump is provided with the self-water-injection mechanism which supplies the treated water which purified a part of the pumped water sucked from the said suction water tank as said lubricating liquid to a said 1st submersible bearing. Pump equipment.   2. The pump equipment according to claim 1, wherein the second submersible bearing of the second vertical shaft pump is a dust-proof type in which a cover for preventing intrusion of foreign matters is disposed.

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