JP2015045249A - Pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure smooth fluid flow from a suction port to a discharge port and enable a rotation shaft and an impeller to be easily removed to improve the maintainability in a pump.SOLUTION: A pump includes: a casing 13 disposed along a vertical direction, the casing 13 where a suction port 11 is provided at the lower end side and a discharge port 12 is provided at a side part; a guide part 14 which may guide a fluid suctioned from the suction port 11 toward the discharge port 12 and be removed from the casing 13 to the upper side; a rotation shaft 15 which is disposed along the vertical direction in the casing 13, is rotatably supported, and may be removed from the casing 13 to the upper side; an impeller 16 fixed to a lower end part of the rotation shaft 15; a circulation part 17 which may circulate the fluid suctioned from the suction port 11 to a space part C in the casing 13 which is located above the guide part 14.

Description

  The present invention relates to a pump applied to an axial flow pump, a mixed flow pump or the like.

  The pump in which the rotation shaft is arranged along the vertical direction has a pumping pipe extending in the vertical direction toward the suction water tank, and a bend pipe whose upper part is bent along the horizontal direction. . And a rotating shaft is penetrated in the pumping pipe from the upper part, and the impeller is being fixed to the lower part. Therefore, when the rotary shaft is driven and rotated by the drive motor while the lower end opening of the pumping pipe is submerged in the fluid, the impeller rotates and the fluid flows into the pumping pipe, and the flow path is pumped upward to bend the bend. Discharged through the tube.

  Examples of such a pump include those described in the following patent documents. The vertical shaft pump described in Patent Document 1 includes a fluid suction port and a fluid discharge port, and a baffle that changes a flow direction in a flow path from the fluid suction port to the fluid discharge port. Moreover, the vertical shaft pump described in Patent Document 2 is a pump in which a pumping pipe and a bend pipe are connected and a main shaft having an impeller is disposed in the pumping pipe.

JP 2012-092806 A JP 2013-083242 A

  In the pump described above, a rotating shaft is disposed in a pumping pipe, and an impeller is attached to a lower portion of the rotating shaft, and it is necessary to periodically maintain the impeller. However, in a conventional pump, when removing an impeller with a rotating shaft, a pumping pipe will be removed and work will become difficult.

  The present invention solves the above-described problems, and provides a pump that can ensure a good fluid flow from the suction port to the discharge port and can be easily detached from the rotating shaft and the impeller to improve maintainability. The purpose is to do.

  In order to achieve the above object, the pump of the present invention comprises a casing that is arranged along the vertical direction and has a suction port on the lower end side and a discharge port on the side, and a fluid sucked from the suction port. A guide portion that can be guided toward the discharge port and detachable upward with respect to the casing, and is disposed in the casing along the vertical direction so as to be rotatably supported and to the casing. A rotating shaft detachable upward, an impeller fixed to the lower end portion of the rotating shaft, and a circulation portion capable of flowing the fluid sucked from the suction port to a space portion above the guide portion in the casing It is characterized by having.

  Therefore, when the rotating shaft rotates and the impeller rotates, the pressure in the casing rises, so that the fluid is sucked into the casing from the suction port, flows while being guided by the guide portion, is pumped upward, and is discharged from the discharge port. It is discharged from. At this time, the fluid sucked into the casing flows from the flow portion to the space above the guide portion, so that a good fluid flow from the suction port to the discharge port can be secured by the guide portion. Further, after the guide portion is removed upward with respect to the casing, the rotary shaft can be removed upward with respect to the casing, and the rotary shaft and the impeller can be easily detached to improve the maintainability.

  In the pump of the present invention, the flow part is an opening formed in the guide part at a position concentric with the rotation shaft.

  Therefore, by forming an opening as a flow part between the guide portion and the rotation shaft, the guide portion and the rotation shaft can be easily separated, and the guide portion and the rotation shaft can be sequentially extracted upward from the casing. .

  The pump according to the present invention is characterized in that the upper end side of the casing is closed and a vent line capable of discharging the air in the space portion to the outside of the casing is provided.

  Therefore, when the fluid sucked into the casing flows from the flow part to the space part above the guide part, the pressure of the space part rises and the fluid is likely to hunt. Therefore, this hunting is suppressed, and a good fluid flow from the suction port to the discharge port can be ensured.

  In the pump of the present invention, the casing is provided with a cylindrical support pipe at a concentric position inside, and the support pipe is supported by the positioning member so as not to rotate circumferentially on the casing side by a positioning member. The rotation shaft is arranged at a concentric position of the rotation shaft, and the rotation shaft is rotatably supported by the support tube by a bearing.

  Therefore, the rotating shaft is properly supported by the casing via the support tube, and stable rotation of the rotating shaft can be maintained. Further, since the support tube is supported by the positioning member so as not to rotate in the circumferential direction with respect to the casing side, the torsion does not occur due to the rotational force of the rotating shaft, and the durability can be improved. .

  In the pump of the present invention, the support pipe is supported so as to be movable along the vertical direction with respect to the casing, and the lower end portion is positioned in contact with the casing side by pressing and supporting the upper end side downward. It is characterized by that.

  Therefore, since the lower end portion of the support tube is pressed and supported downward and is positioned in contact with the casing side, the support tube can be easily fixed at an appropriate position in the vertical direction.

  In the pump of the present invention, a seal member is disposed between the outer peripheral surface of the rotary shaft and the inner peripheral surface of the support tube, and a coolant supply unit is provided between the rotary shaft and the support tube. The impeller is provided with a coolant discharge portion.

  Accordingly, the coolant is supplied from the coolant supply unit between the rotary shaft and the support tube and is discharged from the coolant discharge unit of the impeller, and the bearing interposed between the rotary shaft and the support tube. Can be properly cooled.

  In the pump of the present invention, the casing has a diffuser disposed on the inner peripheral wall of the lower end portion, and the positioning member is disposed between the diffuser and the casing or between the support pipe and the diffuser. It is characterized by that.

  Therefore, the diffuser can be effectively arranged at the lower end of the casing, and the support tube can be properly positioned on the diffuser or the casing by the positioning member.

  In the pump of the present invention, the guide portion and the diffuser are characterized in that the end portions of the respective fluid guide surfaces are arranged at substantially the same position in the radial direction of the casing.

  Therefore, the fluid sucked from the suction port smoothly flows from the fluid guide surface of the diffuser to the fluid guide surface of the guide portion, and the flow can be stabilized.

  In the pump according to the present invention, the guide portion is integrally formed with a mounting cylinder at an upper portion thereof, the bearing is disposed so as to face the radial direction of the mounting cylinder, and the reinforcing rib that connects the support tube and the mounting cylinder. Is provided.

  Accordingly, the support tube is supported by the mounting cylinder through the reinforcing rib at the position of the bearing that supports the rotating shaft, and the swing of the rotating shaft can be appropriately suppressed and guided by the guide portion by the reinforcing rib. The flow of the fluid is not hindered, and the flow can be stabilized.

  In the pump of the present invention, the diffuser is fixed to a lower end portion of the support pipe and can be fitted to the lower end portion of the casing.

  Therefore, the rotating shaft, the support tube, the impeller, and the diffuser can be extracted from the casing, and the maintainability can be improved.

  According to the pump of the present invention, a guide part capable of guiding the fluid sucked from the suction port toward the discharge port, a rotary shaft disposed in the casing along the vertical direction and rotatably supported, and rotation Since the impeller fixed to the lower end portion of the shaft is detachable upward with respect to the casing, a flow part is provided that allows the fluid sucked from the suction port to flow in the space above the guide part in the casing. The portion can secure a good fluid flow from the suction port to the discharge port, and can easily remove the rotating shaft and the impeller, thereby improving maintenance.

FIG. 1 is a longitudinal sectional view illustrating a pump according to the first embodiment. 2 is a cross-sectional view taken along the line II-II in FIG. 1 showing the positioning structure of the casing and the diffuser. FIG. 3 is a cross-sectional view of a main part illustrating a modification of the pump according to the first embodiment. FIG. 4 is a schematic diagram illustrating a pump according to the second embodiment.

  Exemplary embodiments of a pump according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this Example, Moreover, when there exists multiple Example, what comprises combining each Example is also included.

  1 is a longitudinal sectional view showing a pump according to the first embodiment, FIG. 2 is a sectional view taken along the line II-II in FIG. 1 showing a positioning structure of a casing and a diffuser, and FIG. 3 shows a modification of the pump according to the first embodiment. It is principal part sectional drawing.

  In the first embodiment, as shown in FIG. 1, the vertical shaft pump 10 of the present embodiment is disposed in a casing 13 provided with a suction port 11 and a discharge port 12, a guide portion 14 provided in the casing 13, and the casing 13. A rotating shaft 15, an impeller 16 fixed to the rotating shaft 15, and a circulation portion 17.

  The casing 13 has a cylindrical shape, and includes an upper casing 21, a middle casing 22, and a lower casing 23 that are arranged in series along the vertical direction. The lower flange 21b of the upper casing 21 and the upper flange 22a of the middle casing 22 are joined by a plurality of bolts (nuts) 24, and the lower flange 22b of the middle casing 22 is joined to the upper flange 23a of the lower casing 23 by a plurality of bolts. (Nut) 25 is joined. As shown in FIG. 1, in the vertical shaft pump 10 of this embodiment, the inner casing 22 and the lower casing 23 have substantially the same inner diameter, and the upper casing 21 has a slightly larger inner diameter than the middle casing 22 and the lower casing 23. It is a dimension.

  The casing 13 is arranged along the vertical direction in the mounting hole 2 formed in the mounting base 1, is supported by being suspended by using the upper flange 21 a of the upper casing 21, and is sealed by a plurality of bolts 26 through a sealing material 27. It is fixed. The upper casing 21 is provided with a plurality of reinforcing ribs 21c that connect the outer peripheral portion and the upper flange 21a at predetermined intervals in the circumferential direction.

  And the suction opening 11 is formed in the casing 13 by the suction bell 28 being fixed to the lower end side of the lower casing 23. The suction bell 28 has a bell mouth shape with a large diameter toward the suction side (downward), and its upper end is joined to the lower flange 23 b of the lower casing 23 by a plurality of bolts (nuts) 29. In addition, the casing 13 is formed with the elbow piping portion 30 integrally with the middle casing 22, so that the discharge port 12 is formed on the side portion. The elbow piping section 30 forms a second flow path B that is curved at a substantially right angle from the first flow path A that is formed by the lower casing 23 and extends substantially along the vertical direction. In the elbow piping portion 30, the end portion protruding to the side of the middle casing 22 is finally substantially horizontal, and the discharge pipe 31 is connected to the flange portion 30a by a plurality of bolts 32. In addition, the elbow piping part 30 is provided with a plurality of reinforcing ribs 30b along the axial direction on the outer peripheral part at predetermined intervals in the circumferential direction.

  The guide unit 14 can guide the fluid sucked from the suction port 11 of the casing 13 toward the discharge port 12. This guide part 14 forms the 2nd flow path B with the elbow piping part 30. As shown in FIG. That is, the second flow path B includes an inner guide surface F1 positioned inside the bending direction in the elbow piping unit 30, a first outer guiding surface F2 positioned outside the bending direction in the elbow piping unit 30, and the guide unit 14. And a second outer guide surface F3 positioned outside in the bending direction. As shown in FIG. 1, the guide portion 14 has a second outer guide surface F3 of the guide portion 14 that is smooth without a step along the flow direction of the first outer guide surface F2 of the elbow pipe portion 30 and the second flow path B. It is arranged to be continuous. The second outer guide surface F3 of the guide portion 14 is also curved in the circumferential direction, and is arranged so as to be smoothly continuous with the inner surface of the middle casing 22 (elbow piping portion 30) without any step along the circumferential direction. .

  The guide portion 14 is integrally formed with an attachment tube 33 having a smaller diameter than the middle casing 22 at the upper portion. The mounting cylinder 33 has an upper flange 33a and a fitting portion 33b that hangs down from the outer periphery of the upper flange 33a. Further, reinforcing ribs 33 c are formed between the guide portion 14, the mounting cylinder 33 and the upper flange 33 a, and a plurality of the reinforcing ribs 33 c are provided at a predetermined interval in the circumferential direction of the mounting cylinder 33. In the mounting cylinder 33, the upper flange 33a is placed on the upper flange 22a of the middle casing 22, the fitting portion 33b is fitted to the inner peripheral surface of the middle casing 22, and the upper flange 33a is the upper flange 22a. Are joined by a plurality of bolts 34.

  In this case, the guide portion 14 can be carried into the casing 13 through the upper opening 13a formed in the casing 13, and can be carried out from the casing 13 to the outside of the casing 13 through the upper opening 13a. That is, the guide portion 14 can be attached to and detached from the middle casing 22 by a plurality of bolts 34, and can be carried in and taken out from above. Therefore, the guide part 14 is provided with a plurality of hanging brackets 35 on the upper flange 33a.

  The casing 13 is provided with a cover 41 that closes the upper opening 13a of the upper casing 21 at the upper end. The cover 41 has a disk shape, and an outer peripheral portion is placed on the upper flange 21 a of the upper casing 21 and fixed by a plurality of bolts 42. The cover 41 has a circular opening at the center, and the upper end of the support tube 43 is fitted. The support tube 43 is configured by connecting an upper support tube 44 and a lower support tube 45 by a connecting cylinder 46, and is joined by a plurality of bolts (not shown). The support tube 43 has a fitting cylinder 47 joined to the upper support tube 44 fitted in the opening of the cover 41.

  Further, the support tube 43 has a diffuser (stator vane) 51 fixed to the lower end thereof. The diffuser 51 includes a first diffuser 52 and a second diffuser 53. The first diffuser 52 includes a ring-shaped main body 52a, an inner casing 52b, and an outer casing 52c. The main body 52a and the inner casing 52b are connected at the upper end, and the inner casing 52b and the outer casing 52c are connected to a plurality of connecting ribs. They are connected by 52d. The second diffuser 53 includes an inner casing 53a and an outer casing 53b each having a ring shape, and the inner casing 53a and the outer casing 53b are connected by a plurality of connecting ribs 53c.

  In the first diffuser 52, the upper end portion of the main body 52 a is joined to the lower end portion of the lower support tube 45 in the support tube 43, and the outer casing 52 c is fitted to the inner peripheral surface of the lower casing 23. In this case, the 1st diffuser 52 is arrange | positioned along the inner peripheral wall of the lower end part of the lower casing 23, and as shown in FIG. 2, the positioning member is interposed between both. The positioning member includes a convex portion 54 formed on the outer peripheral portion of the outer casing 52c of the first diffuser 52 and a groove portion 55 formed on the inner peripheral portion of the lower casing 23. The convex portion 54 and the groove portion 55 are Relative movement is possible along the vertical direction, but relative movement is impossible along the horizontal circumferential direction. In addition, this positioning member (the convex part 54 and the groove part 55) may be one, and plural may be sufficient as it. Further, a groove portion may be formed on the outer peripheral portion of the first diffuser 52, and a convex portion may be formed on the inner peripheral portion of the lower casing 23. Further, the positioning member is not limited to the convex portion and the groove portion, and may be any shape that can position the first diffuser 52 and the lower casing 23 so as not to be relatively rotatable.

  In the second diffuser 53, the lower end portion of the outer casing 53 b is connected to the upper end portion of the outer casing 52 c in the first diffuser 52 by a plurality of bolts (nuts) 56. In the second diffuser 53, the flange portion 53 d of the outer casing 53 b is fitted to the inner peripheral surface of the lower casing 23. Therefore, the first flow path A is formed between the inner casings 52b and 53a and the outer casings 52c and 53b in the diffuser 51.

  As shown in FIG. 2, in the first diffuser 52, the diameter of the inner casing 52b and the outer casing 52c decreases toward the upper side, but the passage sectional area of the first flow path A increases. On the other hand, in the second diffuser 53, the passage cross-sectional area of the first flow path A is increased by increasing the diameter of the outer casing 53b upward. The second diffuser 53 has an upper end portion that is smoothly continuous with the elbow pipe portion 30 and the guide portion 14. That is, the end portion of the fluid guide surface F4 of the second diffuser 53 and the end portion of the second outer guide surface F3 of the guide portion 14 are disposed at substantially the same position in the radial direction of the middle casing 22.

  The support tube 43 is supported so as not to rotate in the circumferential direction by fitting the convex portion 54 of the diffuser 51 (first diffuser 52) fixed to the lower end portion shown in FIG. 2 into the groove portion 55 of the lower casing 23. . Further, the lower end of the convex portion 54 of the support tube 43 is in contact with the lower casing 23. In the support tube 43, lower ends of a plurality of bolts 57 screwed into the cover 41 press and support the flange 47 a of the fitting cylinder 47 downward. Therefore, the support tube 43 is positioned in the axial direction with respect to the casing 13.

  The cover 41 has a seal box 61 inserted through the opening 41a. In the seal box 61, a flange portion 63 is integrally formed outside the cylindrical portion 62, and a lower portion of the cylindrical portion 62 is inserted into the fitting tube 47 of the support tube 43 with a predetermined gap. The flange portion 63 of the seal box 61 is fixed to the cover 41 with a plurality of bolts 64.

  The support tube 43 has the rotating shaft 15 disposed therein. The rotary shaft 15 is rotatably supported on the support tube 43 by three bearings 71a, 71b, 71c. In this case, the rotary shaft 15 can be moved relative to the support tube 43 in the axial direction by a predetermined distance through the gaps between the bearings 71a, 71b, 71c. The rotating shaft 15 is configured by connecting an upper rotating shaft 72 and a lower rotating shaft 73 by a connecting portion 74. However, the rotating shaft 15 may be integrally formed without being divided. The bearing 71 a is mounted in the cylindrical portion 62 of the seal box 61, the bearing 71 b is mounted in the connecting cylinder 46 that also serves as the bearing box, and the bearing 71 c is mounted in the main body 52 a of the first diffuser 52. .

  The impeller 16 is fixed to the lower end portion of the rotary shaft 15 so as to be integrally rotatable. In the impeller 16, the main body 75 is fitted to the lower end portion of the rotary shaft 15 via the key 15 a, is fixed by a bolt 76, and the bolt 76 is covered with a cap 77. Further, the impeller 16 is integrally formed with an umbrella-shaped casing 78, and an upper end portion thereof is fitted to a lower end portion of the inner casing 52 b of the first diffuser 52 via a casing ring 79 so as to be relatively rotatable. In the impeller 16, a plurality of blades 80 are provided on the outer periphery of the casing 78 at equal intervals in the circumferential direction. Each blade 80 is arranged in the first flow path A.

  In this case, the casing 13, the rotating shaft 15, and the support tube 43 are arranged concentrically. The rotating shaft 15, the impeller 16, the support tube 43, and the diffuser 51 can be attached to the casing 13 from above and can be removed upward.

  In the seal box 61, a seal member (for example, a gland packing) 81 is mounted on the upper inner peripheral surface of the cylindrical portion 62, and is supported by a lid member 82. The seal member 81 seals between the outer peripheral surface of the rotary shaft 15 and the inner peripheral surface of the seal box 61 (support tube 43). In the seal box 61, a coolant supply port (coolant supply unit) 83 for supplying a coolant (cooling water) to the cylindrical portion 62 is formed, and a coolant supply line 84 is connected to the coolant supply port 83. ing. The coolant supply line 84 is also supplied to the seal member 81. On the other hand, in the impeller 16, a plurality of coolant discharge ports (coolant discharge portions) 85 are formed in the casing 78. Therefore, the coolant supplied to the coolant supply port 83 from the coolant supply line 84 descends between the rotary shaft 15 and the support pipe 43, cools the bearings 71 a, 71 b, 71 c, and then the impeller 16. The coolant is discharged from the coolant outlet 85 to the outside.

  The guide part 14 is provided with a circulation part 17 through which the fluid sucked from the suction port 11 can be circulated from the casing 13 to the space C above the guide part 14. The circulation portion 17 is an opening formed in the guide portion 14 at a position concentric with the rotating shaft 15 and the support tube 43, and is secured as a gap between the opening and the support tube 43. Further, a vent line 86 capable of discharging the air in the space C to the outside of the casing 13 is provided. The vent line 86 communicates from the space C to the outside of the casing 13 through the cover 41, and is provided with a relief valve (not shown) that opens at a predetermined pressure.

  The rotary shaft 15 is connected to a drive shaft 93 of a drive device (motor and speed reducer) 92 via a shaft coupling 91 at the upper end. The driving device 92 is supported by a mounting base 94 fixed to the cover 41 so as to surround the shaft coupling 91.

  In this embodiment, since the rotation shaft 15 is constituted by the upper rotation shaft 72, the lower rotation shaft 73, and the connecting portion 74 and is sufficiently long, an anti-sway member may be provided. That is, as shown in FIG. 3, the connecting cylinder 46 (bearing 71 b) constituting the support tube 43 is disposed so as to face the outer peripheral side of the mounting cylinder 33 in the guide member 14 in the radial direction. A reinforcing rib 96 is provided between the connecting cylinder 46 and the mounting cylinder 33. The reinforcing ribs 96 connect the connecting cylinder 46 and the mounting cylinder 33, and a plurality of reinforcing ribs 96 are provided at predetermined intervals in the circumferential direction. In this case, the fluid flow in the second flow path B is not disturbed by disposing the connecting cylinder 46 and the reinforcing rib 96 above the guide member 14.

  Therefore, when the drive device 92 is driven, the rotational force is transmitted to the rotary shaft 15 via the shaft coupling 91, and the rotary shaft 15 rotates. Then, the impeller 16 fixed to the tip end portion of the rotating shaft 15 rotates and the pressure in the casing 13, that is, the pressure in the first flow path A rises, so that the fluid enters the casing 13 from the suction port 11. Inhaled. Then, the fluid sucked into the casing 13 flows through the first flow path A upward in the vertical direction, and after being reduced in pressure by the diffuser 51, is guided by the guide portion 14, thereby passing through the second flow path B. It flows in the horizontal direction and is discharged from the discharge port 12 to the discharge pipe 31.

  When the fluid sucked into the casing 13 flows while being guided by the guide portion 14, the fluid flows from the circulation portion 17 to the space C above the guide portion 14, and the liquid level of the fluid in the casing 13 rises. At this time, the pressure in the space portion C rises, but since the air in the space portion C is discharged outside the casing 13 through the vent line 86, the pressure rise in the casing 13 is suppressed, and the fluid hunting in the casing 13 is suppressed. Is suppressed. Therefore, when the fluid sucked into the casing 13 is guided from the first flow path A to the guide section 14 and flows through the second flow path B, the flow section 17 is filled with the fluid. Thus, the flow is properly guided without being disturbed.

  Further, the vertical shaft pump 10 of the present embodiment can be disassembled during maintenance and can take out each constituent member to the outside. That is, first, the driving device 92 is removed, then the mounting base 94 is removed, and then the shaft coupling 91, the seal box 61, and the cover 41 are removed. And after removing the guide part 14 and carrying out outside, the supporting shaft 43, the impeller 16, and the diffuser 51 are lifted with this rotating shaft 15, and it carries out outside. Thus, the impeller 16 and the diffuser 51 carried out to the outside through the rotating shaft 15 are maintained.

  Thereafter, after the impeller 16 and the diffuser 51 are maintained, the rotating shaft 15, the support tube 43, the impeller 16, the diffuser 51, the guide portion 14, the cover 41, the seal box 61, and the shaft coupling 91 are performed according to the reverse procedure described above. The mounting base 94 and the driving device 92 are attached to the casing 13.

  As described above, in the pump according to the first embodiment, the suction port 11 is disposed along the vertical direction, the suction port 11 is provided on the lower end side, and the discharge port 12 is provided on the side portion. A guide portion 14 capable of guiding fluid toward the discharge port 12 and detachable upward with respect to the casing 13, and disposed in the casing 13 along the vertical direction so as to be rotatably supported and the casing 13. The rotary shaft 15 that can be removed upward, the impeller 16 fixed to the lower end of the rotary shaft 15, and the space C above the guide portion 14 in the casing 13 for the fluid sucked from the suction port 11. The distribution part 17 which can be distributed is provided.

  Therefore, when the rotating shaft 15 rotates and the impeller 16 rotates, the pressure in the casing 13 increases, so that fluid is sucked into the casing 13 from the suction port 11 and guided and flows by the guide portion 14. The water is pumped up and discharged from the discharge port 12. At this time, since the fluid sucked into the casing 13 circulates from the circulation portion 17 to the space C above the guide portion 14, the inside of the casing 13 is filled with the fluid, and the guide portion 14 discharges the suction port 11 from the suction port 11. A good fluid flow to 12 can be ensured. In addition, after the guide portion 14 is removed upward with respect to the casing 13, the rotary shaft 15 can be removed upward with respect to the casing 13, and the rotary shaft 15 and the impeller 16 can be easily removed to improve maintainability. can do.

  In the pump of the first embodiment, the flow portion 17 is an opening formed in the guide portion 14 at a position concentric with the rotation shaft 15. Therefore, the guide part 14 and the rotating shaft 15 can be easily separated, and the guide part 14 and the rotating shaft 15 can be sequentially extracted upward from the casing 13.

  In the pump of the first embodiment, the upper end side of the casing 13 is closed by the cover 41, and a vent line 86 capable of discharging the air in the space C to the outside of the casing 13 is provided. Therefore, when the fluid sucked into the casing 13 flows from the flow portion 17 to the space portion C above the guide portion 14, the pressure of the space portion C rises and the fluid easily hunts, but the space portion C This air is discharged from the vent line 86 to the outside, so that this hunting is suppressed, and a good fluid flow from the suction port 11 to the discharge port 13 can be ensured.

  In the pump according to the first embodiment, a cylindrical support pipe 43 is disposed at a concentric position in the casing 13, and a diffuser 51 is fixed to a lower end portion of the support pipe 43. The diffuser 51 serves as a positioning member and a convex portion 54 and a groove portion. 55, the casing 13 is supported so as not to rotate in the circumferential direction, the rotating shaft 15 is disposed at a concentric position inside the support tube 43, and the rotating shaft 15 is rotatably supported by bearings 71a, 71b, 71c. Therefore, the rotating shaft 15 is appropriately supported by the casing 13 through the support tube 43, and the rotating shaft 15 can be maintained in a stable rotation. Further, since the support tube 43 is supported so as not to rotate in the circumferential direction with respect to the casing 13, the torsion does not occur due to the rotational force of the rotating shaft 15, and durability can be improved. Furthermore, maintainability can be improved by making it possible to easily remove the diffuser 51 together with the rotating shaft 15.

  In the pump according to the first embodiment, the support tube 43 is supported so as to be movable in the vertical direction with respect to the casing 13, and the upper end side is pressed and supported downward by the bolts 57, so that the lower end abuts against the casing 13 and is positioned. doing. Therefore, the support tube 43 can be easily fixed at an appropriate position with respect to the vertical direction.

  In the pump of the embodiment, the seal member 81 is disposed between the outer peripheral surface of the rotary shaft 15 and the inner peripheral surface of the support tube 43, and the coolant supply port 83 is provided between the rotary shaft 15 and the support tube 43. On the other hand, a coolant discharge port 85 is provided in the impeller 16. Therefore, the coolant is supplied from the coolant supply port 83 between the rotary shaft 15 and the support tube 43 and is discharged from the coolant discharge port 85 of the impeller 16. The bearings 71a, 71b, 71c interposed therebetween can be appropriately cooled.

  In the pump of the first embodiment, the end portions of the fluid guide surfaces F3 and F4 are arranged at substantially the same position in the radial direction of the casing 13 by the guide portion 14 and the diffuser 51. Therefore, the fluid sucked from the suction port 11 smoothly flows from the fluid guide surface F4 of the diffuser 51 to the second outer guide surface F3 of the guide portion 14, and the flow can be stabilized.

  In the pump of the first embodiment, the mounting cylinder 33 is formed integrally with the upper portion of the guide portion 14, the bearings 71 a, 71 b, 71 c are arranged facing the radial direction of the mounting cylinder 33, and the support tube 43 and the mounting cylinder 33 are arranged. A reinforcing rib 96 to be connected is provided. Accordingly, the support tube 43 is supported by the mounting cylinder 33 via the reinforcing rib 96 at the positions of the bearings 71a, 71b, 71c that support the rotary shaft 15, and the swing of the rotary shaft 15 can be appropriately suppressed. At the same time, the flow of the fluid guided by the guide portion 14 is not obstructed by the reinforcing rib 96, and stabilization of the flow can be ensured.

  FIG. 4 is a schematic diagram illustrating a pump according to the second embodiment.

  In the second embodiment, as illustrated in FIG. 4, the vertical shaft pump 100 includes a casing 103 in which a suction port 101 and a discharge port 102 are provided, a guide portion 104 provided in the casing 103, and a rotating shaft disposed in the casing 103. 105, an impeller 106 fixed to the rotating shaft, and a circulation part 107.

  The casing 103 is disposed along the vertical direction in the mounting hole 2 formed in the mounting base 1 and is supported by being suspended. The suction port 111 is formed in the casing 103 by fixing the suction bell 111 to the casing 103. Moreover, the discharge port 102 is formed in the side part by forming the elbow piping part 112 in the casing 103 integrally. The elbow piping section 112 forms a second flow path B that is curved at a substantially right angle from the first flow path A that is formed by the casing 103 along the substantially vertical direction. And the elbow piping part 112 finally becomes the substantially horizontal edge part which protrudes to the side of the casing 103, and the discharge pipe which is not shown in figure is connected.

  The guide unit 104 can guide the fluid sucked from the suction port 101 of the casing 103 toward the discharge port 102. This guide part 104 forms the 2nd flow path B with the elbow piping part 112, and has comprised the linear planar shape along the flow direction of the fluid. The guide portion 104 is integrally formed with an attachment cylinder 113 at the top, and an upper flange 114 is formed. The mounting cylinder 113 is fixed by fitting the upper flange 114 to the inner peripheral surface of the casing 103. In this case, the guide portion 104 can be carried into the casing 103 through an upper opening 103 a formed in the casing 103 and can be carried out of the casing 103 from the inside of the casing 103 through the upper opening 103 a.

  The casing 103 is provided with a cover 115 that closes the upper opening 103a at the upper end. The cover 115 has a disc shape, and the outer peripheral portion is fixed to the flange of the casing 103. The cover 115 has a circular opening at the center, and the upper end of the support tube 116 is connected. The support tube 116 is integrally connected with a fitting portion 117 having an enlarged diameter at the lower end.

  In the casing 103, a diffuser (static blade) 118 is fixed to the inner peripheral wall at the lower end. The diffuser 118 includes an inner casing 118a and an outer casing 118b, and both are connected by a plurality of connecting ribs 118c. The support tube 116 has a fitting portion 117 fitted to the inner peripheral surface of the diffuser 118. In this case, a positioning member is interposed between the fitting portion 117 and the diffuser 118. As in the first embodiment, the positioning member is composed of a convex portion formed on the outer peripheral portion of the fitting portion 117 and a groove portion formed on the inner peripheral portion of the diffuser 118, and is relatively movable along the vertical direction. However, relative movement is impossible along the horizontal circumferential direction.

  In the diffuser 118, a first flow path A is formed between the outer casing 118a and the outer casing 118b. The support tube 116 is supported so as not to rotate in the circumferential direction by fitting the convex portion of the fitting portion 117 fixed to the lower end portion into the groove portion of the diffuser 118. In addition, the lower end of the convex portion of the support tube 116 is in contact with the diffuser 118, and although not shown, the lower ends of a plurality of bolts screwed into the cover 115 press and support the support tube 116 downward. Therefore, the support tube 116 is axially positioned with respect to the casing 103.

  The support tube 116 has a rotating shaft 105 disposed therein. The rotating shaft 105 is rotatably supported on the support tube 116 by a bearing (not shown). The impeller 106 is fixed to a lower end portion of the rotating shaft 105 so as to be integrally rotatable. In the impeller 106, a plurality of blades 119 are provided on the outer peripheral portion at equal intervals in the circumferential direction. Each blade 119 is disposed in the first flow path A.

  In this case, the casing 103, the rotating shaft 105, and the support tube 116 are disposed concentrically. The rotating shaft 105, the impeller 106, and the support tube 116 can be attached to the casing 103 from above and can be removed upward.

  The guide part 104 is provided with a circulation part 107 through which the fluid sucked from the suction port 101 can be circulated from the casing 103 to the space C above the guide part 104. The circulation portion 107 is an opening formed in the guide portion 104 at a position concentric with the rotation shaft 105 and the support tube 116, and is secured as a gap between the opening and the support tube 116. In addition, a vent line 120 that can discharge the air in the space C to the outside of the casing 103 is provided.

  The rotating shaft 105 is drivingly connected to a driving shaft 123 of a driving device (motor and speed reducer) 122 via a shaft coupling 121 at an upper end portion. The driving device 122 is supported by the mounting base 124 so as to surround the shaft coupling 121.

  The support tube 116 is supported by the casing 103 by a plurality of steady members 125 between the guide portion 104 and the fitting cylinder 117.

  As described above, in the pump according to the second embodiment, the suction port 101 is provided along the vertical direction, the suction port 101 is provided at the lower end side, and the discharge port 102 is provided at the side portion. A guide portion 104 that can guide the fluid toward the discharge port 102 and that can be removed upward with respect to the casing 103, and is disposed in the casing 103 along the vertical direction so as to be rotatably supported and the casing 103. The rotary shaft 105 that can be removed upward, the impeller 106 fixed to the lower end of the rotary shaft 105, and the space C above the guide portion 104 in the casing 103 for the fluid sucked from the suction port 101 The distribution part 107 which can be distributed is provided.

  Accordingly, when the rotating shaft 105 rotates and the impeller 106 rotates, the pressure in the casing 103 increases, so that fluid is sucked into the casing 103 from the suction port 101 and flows while being guided by the guide portion 104. Is discharged from the discharge port 102. At this time, since the fluid sucked into the casing 103 flows from the circulation portion 107 to the space C above the guide portion 104, the inside of the casing 103 is filled with the fluid, and the guide portion 104 discharges the discharge port from the suction port 101. Good fluid flow to 102 can be ensured. Further, after the guide portion 104 is removed upward with respect to the casing 103, the rotary shaft 105 can be removed upward with respect to the casing 103, so that the rotary shaft 105 and the impeller 106 can be easily removed to improve maintainability. can do.

  In the pump of the second embodiment, a cylindrical support tube 116 is arranged at a concentric position in the casing 103, and the fitting portion 117 is fixed to the lower end portion of the support tube 116, while the diffuser 118 is fixed to the casing 103 and fitted. The joint portion 117 is supported on the diffuser 118 in a circumferentially non-rotatable manner by convex portions and groove portions as positioning members. Therefore, the rotating shaft 105 is appropriately supported by the casing 103 via the support tube 116, and the rotating shaft 105 can be maintained in a stable rotation. Further, since the support tube 116 is supported so as not to rotate in the circumferential direction with respect to the casing 103, the torsion does not occur due to the rotational force of the rotating shaft 105, and durability can be improved.

  In the above-described embodiment, the flow parts 17 and 107 are openings formed concentrically with the rotation shafts 15 and 105 and the support pipes 43 and 116 in the guide parts 14 and 104. However, the present invention is not limited to this configuration. Instead, the flow part may be an opening formed at a position that is not concentric with the rotation shaft and the support tube in the guide part. In this case, a plurality of openings may be provided.

10, 100 Vertical shaft pump 11, 101 Suction port 12, 102 Discharge port 13, 103 Casing 14, 104 Guide portion 15, 105 Rotating shaft 16, 106 Impeller 17, 107 Flow portion 21 Upper casing 22 Middle casing 23 Lower casing 28, 111 Suction bell 30, 112 Elbow piping section 33, 113 Mounting cylinder 41, 115 Cover 43, 116 Support pipe 44 Upper support pipe 45 Lower support pipe 46 Connecting cylinder 47 Fitting cylinder 51, 118 Diffuser 52 First diffuser 53 Second diffuser 54 Projection 55 Groove 61 Seal Box 71a, 71b, 71c Bearing 72 Upper Rotating Shaft 73 Lower Rotating Shaft 74 Connecting Portion 80, 119 Blade 83 Coolant Supply Port (Coolant Supply Portion)
84 Coolant supply line 85 Coolant outlet (coolant outlet)
86, 120 Vent line 92, 122 Drive device A 1st flow path B 2nd flow path C Space part

Claims (10)

A casing which is arranged along the vertical direction and has a suction port on the lower end side and a discharge port on the side part;
A guide part capable of guiding the fluid sucked from the suction port toward the discharge port and being removable upward with respect to the casing;
A rotating shaft that is disposed along the vertical direction in the casing and is rotatably supported and is removable upward with respect to the casing;
An impeller fixed to the lower end of the rotating shaft;
A flow part capable of flowing the fluid sucked from the suction port to a space above the guide part in the casing;
The pump characterized by having.   The pump according to claim 1, wherein the flow part is an opening formed in the guide part at a position concentric with the rotation shaft.   3. The pump according to claim 1, wherein the casing is closed at an upper end side, and is provided with a vent line capable of discharging the air in the space portion to the outside of the casing.   The casing is provided with a cylindrical support tube at an inner concentric position. The lower end of the support tube is supported by a positioning member on the casing side so as not to rotate in the circumferential direction, and the support tube is rotated to the inner concentric position. The pump according to any one of claims 1 to 3, wherein a shaft is disposed, and the rotating shaft is rotatably supported by the support pipe by a bearing.   The support pipe is supported so as to be movable along the vertical direction with respect to the casing, and the lower end portion is positioned in contact with the casing side by pressing and supporting the upper end side downward. Item 5. The pump according to Item 4.   A seal member is disposed between the outer peripheral surface of the rotary shaft and the inner peripheral surface of the support tube, and a coolant supply unit is provided between the rotary shaft and the support tube, while the impeller is provided with a coolant. 6. The pump according to claim 4 or 5, wherein a discharge part is provided.   The diffuser is disposed on an inner peripheral wall of a lower end portion of the casing, and the positioning member is disposed between the diffuser and the casing or between the support pipe and the diffuser. The pump according to any one of claims 4 to 6.   8. The pump according to claim 7, wherein the guide portion and the diffuser are arranged at substantially the same position in the radial direction of the casing in the end portions of the fluid guide surfaces.   The guide portion is integrally formed with a mounting cylinder at an upper portion thereof, the bearing is disposed opposite to the mounting cylinder in a radial direction, and a reinforcing rib for connecting the support tube and the mounting cylinder is provided. The pump according to any one of claims 4 to 8.   The pump according to any one of claims 7 to 9, wherein the diffuser is fixed to a lower end portion of the support pipe and can be fitted to a lower end portion of the casing.

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