JP4913559B2 - Vertical shaft pump installation structure - Google Patents

Description

  The present invention relates to a movable blade type vertical shaft pump installation structure in which the blade angle can be changed.

  This type of vertical shaft pump is described, for example, in the following prior art document.

Japanese Patent Laid-Open No. 11-117895

  In this patent document, a hollow rotating shaft is penetrated inside a casing having a suction bell portion at the lower end, a pumping pipe, and a discharge elbow portion at the upper end, and at the lower end of the rotating shaft located in the suction bell portion. A vertical pump with an impeller is described. An operation rod is disposed inside the rotary shaft, and the blade angle of each blade portion of the impeller can be changed by moving the operation rod up and down by slide drive means.

  When the impeller is rotated by the rotation driving means, the vertical shaft pumps the drainage in the water absorption tank of the drainage pump station in a substantially vertical upward direction with a pumping pipe, and in a horizontal direction with respect to the pumping pipe in a discharge elbow part. Change the direction of water flow. Then, it is pumped to a downstream sewage treatment plant via a discharge pipe connected to the discharge elbow, subjected to purification treatment, and discharged to a river or the like. Moreover, the amount of drainage can be adjusted without changing the number of rotations of the rotation drive means by changing the blade angle of the wing portion by the slide drive means.

  However, in this vertical shaft pump, a fluid reaction force due to the drainage flowing in the pipe including the casing and the discharge pipe is applied as a load to the slide driving means and the operation rod. And the load resulting from this fluid reaction force causes malfunction of a vertical shaft pump. In addition, the load caused by the fluid reaction force causes abnormal wear of the components of the rotating shaft bearing and the slide driving means, and there is a problem that the usable period (life) is shortened. These problems are important issues to be overcome in order to increase reliability in a drainage system to which a vertical shaft pump is applied.

  The cause of this problem is that, in a large-diameter pump, the pipe load due to thermal expansion acting on the pipe exceeds the fluid reaction force, so that the pipe cannot be fixed in the axial direction. With this configuration, the vertical shaft pump receives all the fluid reaction force at the discharge elbow portion which is a fixed portion of the pump. As a result, the discharge elbow part is displaced in the direction opposite to the discharge direction of the water flow, so that a great load is generated not only on the rotating shaft of the pump but also on the blade angle adjusting mechanism, which greatly affects the operation.

  Of course, when the discharge elbow part is displaced, the load also acts on the installation wall part for fixing the pump, so that the floor strength needs to be increased and the load distribution to the civil engineering structure is also affected.

  The present invention has been made in view of the conventional problems, and provides a highly reliable installation structure of a vertical shaft pump that suppresses a load on a drive unit due to a fluid reaction force and does not cause malfunction. Is an issue.

In order to solve the above-described problems, the vertical pump installation structure of the present invention has a pumping pipe extending upward in a substantially vertical direction from the vicinity of the bottom of the water absorption tank, and a water flow in a substantially horizontal horizontal direction continuously from the upper end of the pumping pipe. A casing having a discharge elbow part curved to change, a discharge pipe connected to the discharge elbow part of the casing, and a hollow rotation penetrating from above the discharge elbow part along the axis of the pumping pipe A shaft, a rotation driving means for rotating the rotating shaft, an impeller disposed at a lower end of the rotating shaft and having a plurality of wings projecting radially, and moved along the axis of the rotating shaft And a slide driving means that is disposed above the discharge elbow portion and that changes the blade angle of each wing portion by moving the operation rod. Installation structure Te, on top of the water tank, provided with an installation wall portion installed to position the discharge elbow section, the discharge elbow, provided the base for installing the slide driving means and the ejection of an end The elbow part is fixed to the pedestal , the other end is fixed to the installation wall part, and support means for supporting the discharge elbow part from the opposite side to the discharge direction of the water flow from the discharge elbow part is provided. .

  This vertical shaft pump installation structure is provided with support means for supporting the discharge elbow part on the installation wall part from the side opposite to the discharge direction from the discharge elbow part. Even if a load in the direction acts, it is possible to suppress movement of the discharge elbow. Thereby, since the load to the slide drive means and operation rod of a movable wing apparatus can be suppressed, the malfunction and deterioration accompanying use can be suppressed. As a result, the usable period can be extended, and the reliability of the product can be improved.

In this installation structure, it is preferable that the support means has a rigidity capable of adjusting the entire length and maintaining the adjusted state .
Specifically, the support means includes a first shaft member having one end fixed to the discharge elbow portion, and one end fixed to the installation wall portion, the shaft core of which is the shaft core of the first shaft member. Extending and contracting comprising: a second shaft member disposed so as to be positioned coaxially; and a connecting member that connects the other end of the first shaft member and the other end of the second shaft member so as to be able to separate and approach each other. It is preferable to consist of a member .
In this way, errors related to installation can be prevented, and stability can be reliably maintained by adjusting the support force during maintenance.

  In the installation structure of the vertical shaft pump of the present invention, since the movement of the discharge elbow portion caused by the fluid reaction force can be suppressed by the support means, the load on the slide drive means and the operation rod can be suppressed. As a result, internal contact and the like associated with these displacements can be suppressed, so that damage and burn-in can be prevented, the usable period can be extended, and reliability can be improved. Further, since it is possible to suppress an increase in the drive capacity of the rotation drive means, it is effective for simplifying the system.

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

  FIG. 1 shows an installation structure of a vertical shaft pump 10 according to the first embodiment of the present invention. First, this vertical shaft pump 10 is for draining rainwater or the like flowing into a water absorption tank 70 of a drainage pump station from an inflow side pipe (sewer pipe) (not shown) into a discharge water tank of a downstream treatment plant or the like. The casing 11 and the discharge pipe 19 are provided.

  The casing 11 has a pumping pipe 12 that is piped so as to extend substantially vertically upward from the vicinity of the bottom of the water absorption tank 70, and a discharge elbow part 17 that is connected to the upper end of the pumping pipe 12. The pumping pipe 12 includes three straight pipe portions 13a, 13b, and 13c and a pump casing portion 14 at the lower end, and is formed by joining flange portions 15 provided at the respective end portions. Among them, the pump casing portion 14 is provided with an impeller 26 of a drainage mechanism, which will be described later, and a bulging portion 14a bulging from the lower end of the straight pipe portion 13c so as to form a vertically long substantially elliptical shape, and the bulging A suction bell portion 14b that is continuous with the lower portion of the portion 14a is provided. A guide blade portion 16 is provided in the bulging portion 14a. The suction bell portion 14b, which is the lowermost portion of the casing 11, has a substantially truncated cone shape with a diameter expanded toward the opening at the lower end, and the lower end opening extends in the horizontal direction. Moreover, the discharge elbow part 17 changes the substantially vertical upward water flow by the pumping pipe 12 into the substantially horizontal horizontal water stream continuously from the upper end of the straight pipe part 13a, and is positioned in a state where both ends are curved by 90 degrees. It consists of a curved tube. Among them, a connecting joint flange 18 having a larger diameter than the other flanges 15 is provided at the connection end of the straight pipe part 13 a and the discharge elbow part 17 to be fixed to the first floor part 72.

  The discharge pipe 19 includes a plurality of straight pipe portions 20a, 20b,... And a discharge valve portion 21 and a flexible pipe portion 22 interposed between the straight pipe portions 20a, 20b. Similar to the casing 11, these are linearly joined so as to have the same axial core by flange portions 23 provided at the respective end portions. Specifically, the straight pipe portion 20a is joined to the end portion of the discharge elbow portion 17 of the casing 11 and piped so as to extend in a substantially horizontal direction. The discharge valve portion 21 is joined to the straight pipe portion 20a, and enables the throttle operation with the internal flow path 45 as a predetermined opening area. The flexible tube portion 22 is joined to the discharge valve portion 21 and can be expanded and contracted along the axial direction in order to absorb the expansion and contraction in the axial direction caused by the straight tube portions 20a, 20b. The straight pipe part 20b is joined to the flexible pipe part 22 and is used for draining to a downstream treatment plant.

  The vertical shaft pump 10 includes a rotating shaft 24 disposed in the casing 11, an impeller 26 disposed at the lower end of the rotating shaft 24, and a prime mover that is a rotational driving means disposed at the upper end of the rotating shaft 24. 28. In this embodiment, blade angle adjusting means 33 for changing the blade angle of the blade portion 27 of the impeller 26 is further provided.

  The rotating shaft 24 is formed of a hollow annular pipe, and is penetrated from above the discharge elbow portion 17 along the axial center of the pumping pipe 12. The rotary shaft 24 is rotatably supported by bearings 25a to 25d in the vicinity of both end portions and in a substantially intermediate portion in the pumped water pipe 12. The uppermost bearing 25 a is disposed in a watertight manner in a through hole provided in the discharge elbow portion 17. The bearing 25 b is disposed in the vicinity of the bearing 25 a in the discharge elbow portion 17. The bearing 25c is disposed in a straight pipe portion 13b having a shorter overall length than the other straight pipe portions 13a and 13c. The bearing 25d is disposed in the pump casing portion 14. The bearings 25a to 25d are preferably non-lubricated bearings that do not require lubricating water, and among them, Teflon bearings are preferable. However, a rubber cutless bearing that needs to be supplied with lubricating water may be used.

  The impeller 26 is fixed to the lower end of the rotating shaft 24 and is of a mixed flow type having stable characteristics over the entire range of motion. The impeller 26 is provided with wings 27 so as to be rotatable at predetermined intervals in the circumferential direction so as to form a radial shape. Inside the impeller 26, there is disposed a rotating mechanism (not shown) that is connected to the wing portion 27 and rotates the wing portion 27 about an axis that is a protruding direction.

  The prime mover 28 includes a motor and a speed reduction mechanism, and an output shaft 29 of the prime mover 28 is connected to the upper end of the rotating shaft 24 by a pair of couplings 30A and 30B. These couplings 30A and 30B are provided with concave depressions 31A and 31B on the side of the coupling surface, and a coupling member 54 of the operation rod 34 described later is disposed in a space formed by these. The coupling 30B connected to the rotating shaft 24 is provided with an insertion hole 32 through which the connecting portion 56 of the connecting member 54 is inserted.

  The blade angle adjusting means 33 includes an operation rod 34 movably disposed along the axis of the rotary shaft 24 and a slide drive mechanism 35 that moves the operation rod 34 in the vertical direction. Yes.

  The lower end of the operation rod 34 is connected to a rotating mechanism in the impeller 26, and the blades of the blade portions 27 of the impeller 26 are moved through the rotating mechanism by moving in the vertical direction along the axis of the rotating shaft 24. The angle is changed.

  The slide drive mechanism 35 is disposed above the discharge elbow portion 17 and, as shown in FIG. 2, generally includes a bearing case 36, a bearing retainer 41, a bearing bush 46, a connecting member 54, And a worm gear 57.

  The bearing case 36 has a cylindrical shape in which a bracket portion 37 is fixed on the outer periphery of the lower end of the bearing case 36 so as to protrude above the discharge elbow portion 17. A spiral thread groove 38 with which the bearing retainer 41 engages is provided on the inner peripheral surface of the bearing case 36. Further, a worm gear disposition portion 39 is provided on the upper portion of the bearing case 36, and the upper portion is covered with a bearing cover 40 having an opening 40a.

  The bearing retainer 41 has a cylindrical shape disposed inside the bearing case 36, and a screw portion 42 that is screwed into the screw groove 38 is provided on the outer peripheral surface thereof. A slide engagement groove 43 extending in the vertical direction is provided above the outer peripheral portion of the bearing retainer 41. Further, a bush holding step portion 44 that protrudes inward so as to form an annular shape is provided on an inner peripheral portion of the bearing retainer 41. The bush holding step 44 is provided with a flow path 45 for allowing the lubricating oil supplied from above to flow downward.

  The bearing bush 46 is disposed inside the bearing retainer 41 so as to be rotatable about an axial core extending in the vertical direction. The belling bush has a cylindrical shape through which the rotary shaft 24 can be inserted, and a flange-shaped mounting portion 47 in which a connecting member 54 is disposed is provided on the top. The bearing bush 46 is arranged from above with respect to the bearing retainer 41, and the bush holding stage via a first bearing member 48 and a first holding member 49 that form an annular shape disposed below the mounting portion 47. It is arranged on the part 44. Further, a second bearing member 50 and a second holding member 51 are further provided below the bearing retainer 41, and the bush holding step portion 44 is sandwiched between the bearing members 48 and 50 so as to be rotatable. Reference numeral 52 denotes a nut for preventing the second bearing member 50 and the second holding member 51 from falling off. Further, the first holding member 49 is provided with a flow path 53 for causing the lubricating oil to flow downward similarly to the bush holding step portion 44.

  The connecting member 54 includes a rod fixing portion 55 having a disc shape, and a plurality of connecting portions 56 suspended from the rod fixing portion 55 at a predetermined interval in the circumferential direction. And the rod fixing | fixed part 55 is connected with the upper end of the operating rod 34 protruded in the couplings 30A and 30B from the rotating shaft 24, each connection part 56 is inserted in the insertion hole 32 of the coupling 30B, and the lower end is bearing. It is connected to the mounting portion 47 of the bush 46.

  The worm gear 57 is a driving means for moving the operation rod 34 in the vertical direction through the connecting member 54 by moving the bearing bush 46 in the vertical direction via the bearing retainer 41. The worm gear 57 is arranged such that a drive shaft 58 connected to a prime mover (not shown) composed of a motor and a speed reduction mechanism extends in a tangential direction with respect to the worm gear arrangement portion 39 in a plan view, and has a screw at the tip thereof. A worm 59 made of a gear is provided. The worm wheel 60 that meshes with the worm 59 is a helical gear having a hole for fitting the bearing retainer 41 at the center thereof. A protrusion 61 that engages with the slide engagement groove 43 of the bearing retainer 41 is provided on the inner peripheral portion of the worm wheel 60. In addition, the protrusion part 61 of this embodiment is provided by screwing a volt | bolt.

  In the slide drive mechanism 35 configured as described above, when the worm 59 is rotated by the prime mover, the worm wheel 60 rotates about the axis. Then, the bearing retainer 41 rotates in the circumferential direction in conjunction with the worm wheel 60 by the engagement between the protrusion 61 and the slide engagement groove 43. As a result, the bearing retainer 41 moves upward or downward by screwing the thread groove 38 of the bearing case 36 and the threaded portion 42 of the bearing retainer 41. At this time, the worm wheel 60 maintains its attachment position (height), and only the engagement position with the slide engagement groove 43 extending in the vertical direction is displaced in the vertical direction.

  When the bearing retainer 41 moves in the vertical direction, the bearing bush 46 rotatably held by the bush holding step portion 44 moves in conjunction with the vertical direction. As a result, the operating rod 34 can be moved in the vertical direction with respect to the rotary shaft 24 by moving the connecting member 54 in the vertical direction in conjunction with the bearing bush 46. As a result, the blade angle of the blade portion 27 of the impeller 26 is changed.

  When the output shaft 29 is rotated by the prime mover 28, the rotating shaft 24 and the connecting member 54 are rotated via the couplings 30A and 30B. As a result, the operating rod 34 and the bearing bush 46 rotate in conjunction with the rotating shaft 24, while the bearing retainer 41 and the bearing case 36 do not rotate and maintain that state.

  As shown in FIGS. 1 and 3, the pump station in which the vertical shaft pump 10 having the above-described configuration is provided includes an installation wall portion 71 that is positioned on the upper side of the water absorption tank 70 from the discharge elbow portion 17. The installation wall portion 71 includes a first floor portion 72 that places and fixes the joint-use joint flange portion 18 of the casing 11 on the upper side, and a second floor portion 73 that sets and fixes the prime mover 28 on the upper side. ing. In addition, outer peripheral walls 74A, 74B, and 74C that extend in the vertical direction are provided between the floor portions 72 and 73, except for the direction in which the discharge pipe 19 extends.

  In this embodiment, the discharge elbow portion 17 is provided with a support wall 75 that also serves as a pedestal for installing the slide drive mechanism 35, and the outer peripheral wall 74 </ b> A and the support wall 75 positioned on the opposite side of the direction in which the discharge pipe 19 extends. A support tool 80 for supporting the discharge elbow portion 17 of the casing 11 is disposed between the two.

  The support wall 75 is fixed so as to protrude vertically upward from the outer peripheral surface of the curved discharge elbow portion 17, and the vertical support surface 76 positioned in parallel with the outer peripheral wall 74 A and the slide drive mechanism 35. And a horizontal fixing surface 77 to be fixed.

  As shown in FIGS. 3 and 4, the support 80 includes a cylindrical main body 81 and mounting plates 82 provided at both ends so as to be positioned perpendicular to the axis of the main body 81. Yes. Attachment holes 83 are provided at four corners of the attachment plate 82. In addition, reinforcing ribs 84 that extend along the axial center of the main body 81 at a predetermined interval (90 degrees) in the circumferential direction project outwardly in the radial direction on the outer periphery of the main body 81. The support 80 is bolted so that one mounting plate 82 cannot be detached from the support surface 76 so as to be collinear with the axial center of the discharge pipe 19, which is the discharge direction from the discharge elbow 17. The other mounting plate 82 is fixed to the outer peripheral wall 74A by bolting or the like so as not to be detached. Moreover, the fixing position with respect to the support surface 76 is configured to be located in the vicinity of the slide drive mechanism 35, that is, in the vicinity of the upper end support surface 76.

  When the vertical pump 10 installed in this way is operated, the impeller 26 is rotated by the power of the prime mover 28, and the water in the water absorption tank 70 is sucked up vertically from the lower end of the pumping pipe 12. Then, the water flow is changed by 90 degrees at the discharge elbow part 17 and discharged in the horizontal direction downstream through the discharge pipe 19.

  At this time, in the single floor type installation structure in which the vertical shaft pump 10 is installed only by the upper second floor portion 73, the pump casing weight (N) is Wp, the pump rotating body weight (N) is Wr, and the driving machine weight (N). Is Wm, pump water weight (N) is Ww, and thrust bearing load (N) is W3, a load of Wp + Wr + Wm + Ww + W3 is applied to the second floor portion 73. Further, the fluid reaction force (N) W1 applied to the impeller 26 is equal to the thrust bearing load W3 (W1 = W3).

  In the two-floor type installation structure in which the vertical shaft pump 10 is installed by the lower first floor portion 72 and the upper second floor portion 73, a load of Wm + Wr + W3 is applied to the first floor portion 72, and the second floor portion A load of Wp + Ww−W2 is applied to 73. W2 is a fluid pressure acting when the fluid sucked up along the discharge pipe 19 collides with the inner surface of the discharge vent portion, and the force is a fluid reaction force W1 applied to the impeller 26 and a thrust bearing load W3. (W1 = W2 = W3).

  Then, since the piping load of the vertical shaft pump 10 expands in the axial direction when the discharge pressure W4 acts on the flexible tube portion 22 of the discharge tube 19, the fluid on the curved inner surface of the discharge elbow portion 17 flows. A fluid reaction force W5 that collides in the direction opposite to the discharge direction is generated. The problem caused by the fluid reaction force W5 can be alleviated by setting a fixing bolt so as to restrain the axial movement of the discharge pipe 19, but in a large-diameter pipe, the load due to thermal expansion is reduced. Since it becomes larger than the fluid reaction force W5, it cannot be fixed in the axial direction. Therefore, all the loads resulting from the fluid reaction force W5 are supported by the floor portions 72 and 73.

When the fluid reaction force W5 is applied, the discharge elbow portion 17 is entirely displaced to the side opposite to the discharge direction, which is the load direction of the fluid reaction force W5 with respect to the discharge elbow portion 17. As a result, the pumping pipe 12 is also affected by the displacement, and an excessive bearing force acts on the bearings 25a to 25d of the rotating shaft 24. Therefore, it causes abnormal wear and damage / breakage. Here, the discharge pressure (Pa) is Pd, the discharge pipe area (m ² ) is A, the flexible tube spring constant (N / m) is Kp, the flexible tube deformation (m) is Sp, and the discharge elbow When the spring constant (N / m) of 17 is Kf and the deformation amount (m) of the discharge elbow 17 is Sf, the balance of forces of W4 and W5 is as follows.

  Therefore, in order to prevent contact with the bearings 25a to 25d when the fluid reaction force W5 is applied, the deformation amount of the discharge elbow portion 17 needs to be within the bearing gap. Incidentally, when the bearings 25a to 25d are rubber-made cutless bearings that need to be supplied with lubricating water, the clearance is 1 mm. When the bearings are non-lubricated bearings that do not require lubricating water, the allowable value is 0.5 mm. It is. In particular, in the case of a Teflon bearing, the allowable value is even smaller, 0.25 mm.

  Moreover, in this embodiment, a blade angle adjustment mechanism for adjusting the blade angle of the blade portion 27 of the impeller is mounted. Therefore, when the discharge reaction elbow 17 is displaced by such a fluid reaction force W5, it acts as a lateral load on the blade angle adjusting mechanism, thereby increasing the blade angle operating torque and, in the worst case, the blade angle. Cannot be changed. Therefore, in this embodiment, it is necessary to suppress the deformation amount of the discharge elbow part 17 with higher accuracy.

  Specifically, in the vertical shaft pump 10 equipped with the blade angle adjusting mechanism, the driving torque T (Nm) is given by the electric motor W (kw), the wheel diameter (m) is D, and the friction coefficient is ηw. The relationship between the push / pull load W6 (N) and the push / pull torque T6 (Nm) at 30A and 30B is given by the following equation.

  The lateral load acts on the friction angle of the tooth surface of the worm wheel 60 and increases the stamp load W6. In addition, when the discharge pressure W4 is applied to the lateral load, a fluid reaction force W5 is generated as a piping load. During operation of the vertical shaft pump 10, a siphon is formed, the discharge pressure becomes negative, and the pipe reaction force does not normally occur. However, positive pressure acts until the siphon is formed or while the discharge valve portion 21 is fully opened. Further, when the discharge pipe 19 has the flexible pipe portion 22, a pipe reaction force is generated as described above. The fluid reaction force W5 is supported by the floor portions 72 and 73.

  Therefore, in the present embodiment, a support that supports between the discharge elbow portion 17 of the casing 11 and the outer peripheral wall 74A is provided between the outer peripheral wall 74A and the support wall 75 located on the opposite side to the extending direction of the discharge pipe 19. A tool 80 is provided. Moreover, the main body 81 of the support 80 is fixed so that the axis is located in the vicinity of the slide drive mechanism 35. Therefore, even if a substantially horizontal load due to the fluid reaction force W5 acts on the discharge elbow portion 17, it is possible to provide a drag force W7 that counters the load. Therefore, lateral movement (displacement) of the discharge elbow portion 17 due to the action of the fluid reaction force W5 can be suppressed.

  As a result, it is possible to prevent an excessive bearing force from acting on the bearings 25a to 25d of the rotating shaft 24. Therefore, it is possible to suppress an increase in the drive capacity of the prime mover 28 that rotates the rotary shaft 24, which is also effective in simplifying the system. Moreover, the load (internal contact) to the slide drive mechanism 35 and the operation rod 34 which are drive parts can be suppressed. Therefore, similarly, it is possible to suppress an increase in the driving capacity of the prime mover, and it is possible to suppress malfunction and deterioration due to use. Therefore, the usable period of each component can be extended, and the reliability of the vertical shaft pump 10 can be improved. Moreover, since the load applied to the installation wall portion 71 of the water absorption tank is distributed to the horizontal floor portions 72 and 73 and the outer peripheral wall 74A vertical, the load design can be reduced and the weight can be reduced, and the rigidity can be reduced. The vibration at the time of operation can also be reduced with the improvement.

  FIG. 5 shows an installation structure of the vertical shaft pump 10 of the second embodiment. This second embodiment differs from the first embodiment only in that the support 80 of the first embodiment, which is not adjustable in length, is applied with a support 80 made of an elastic member that can change the overall length. ing.

  Specifically, the support 80 according to the second embodiment includes a pair of hard shaft members 85A and 85B and a turnbuckle that is a connecting member disposed at the ends (the other end) of the shaft members 85A and 85B. 87. The shaft members 85A and 85B are made of metal filaments having a circular cross section, and screw portions 86A and 86B are formed at one end portions thereof. The first shaft member 85A has an end portion (one end) opposite to the screw portion 86A so as to be collinear with the axial center of the discharge pipe 19 that is the discharge direction from the discharge elbow portion 17 in plan view. It is joined to the support surface 76 so as not to be detached. And the joining position with respect to this support surface 76 is comprised so that it may be located in the vicinity of the slide drive mechanism 35, ie, the support surface 76 of the upper end. The second shaft member 85B has an end (the other end) opposite to the screw portion 86B separated from the outer peripheral wall 74A so that the shaft center is linearly (coaxial) with the shaft core of the shaft member 85A. It is buried impossible. The turnbuckle 87 is disposed so as to be screwed into the threaded portions 86A and 86B of the shaft members 85A and 85B, and the shaft members 85A and 85B are separated from each other by rotation about the shaft core of the shaft members 85A and 85B. It can move in the direction of approaching.

  In the second embodiment configured as described above, the same operations and effects as the first embodiment can be obtained. In addition, since the support member 80 is formed by connecting the pair of shaft members 85A and 85B so that they can be separated and approached by the turnbuckle 87, installation errors can be prevented and the support force can be reliably adjusted by adjusting the support force during maintenance. Stability can be maintained.

  The installation structure of the vertical shaft pump 10 of the present invention is not limited to the configuration of the above embodiment, and various modifications can be made.

  For example, in the above-described embodiment, one support 80 is disposed between the discharge elbow 17 and the installation wall 71. However, depending on the magnitude of the fluid reaction force W5 and the strength (rigidity) of the installation wall 71. For example, as shown in FIG. 6, the two support members 80, 80 may be further inclined so that the fluid reaction force W <b> 5 is dispersed and received by the installation wall portion 71.

  Further, in the second embodiment, an expansion / contraction member composed of a pair of shaft members 85A and 85B and a turnbuckle 87 is applied as the support tool 80. However, for example, a hydraulic cylinder is used, and the overall length can be adjusted. Any configuration having rigidity that can be reliably maintained is applicable.

  Furthermore, although the vertical shaft pump 10 has a two-floor installation structure in the above-described embodiment, it can be applied to a single-floor or suspension installation structure, and similar actions and effects can be obtained.

  Furthermore, in the above embodiment, the worm gear 57 is applied as the drive means of the slide drive mechanism 35, but any configuration can be applied as long as the bearing bush 46 can be moved in the vertical direction.

  The installation structure of the present invention has a normal vertical shaft pump that drains a predetermined amount of water accumulated in the water absorption tank 70 and a pump that is started in advance to cope with a large amount of rainwater inflow for a short time. Any of the stand-by type vertical shaft pumps that start draining at the same time as they flow into the pumping station can be applied, and similar actions and effects can be obtained.

It is sectional drawing which shows the installation structure of the vertical shaft pump which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the structure of a slide drive mechanism. It is a principal part top view of FIG. It is principal part sectional drawing of FIG. It is a principal part top view which shows the installation structure of the vertical shaft pump which concerns on 2nd Embodiment. It is a principal part top view which shows the modification of installation structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Vertical shaft pump 11 ... Casing 12 ... Pumping pipe 17 ... Discharge elbow part 18 ... Installation combined joint flange part 19 ... Discharge pipe 24 ... Rotary shaft 26 ... Impeller 27 ... Wing part 28 ... Motor | power_engine (rotation drive means)
34 ... Operation rod 35 ... Slide drive mechanism 70 ... Water absorption tank 71 ... Installation wall part 72 ... First floor part 73 ... Second floor part 74A-74C ... Outer peripheral wall 75 ... Support wall 80 ... Support tool 85A, 85B ... Shaft member 86A, 86B ... Screw part 87 ... Turnbuckle (connection member)

Claims (3)

A casing having a pumping pipe extending upward in a substantially vertical direction from the vicinity of the bottom of the water absorption tank, and a discharge elbow portion curved so as to change the water flow in a substantially horizontal direction continuously to the upper end of the pumping pipe;
A discharge pipe connected to the discharge elbow of the casing;
A hollow rotating shaft penetrating from above the discharge elbow portion along the axis of the pumping pipe;
Rotation driving means for rotating the rotation shaft;
An impeller disposed at a lower end of the rotating shaft and having a plurality of wings projecting radially;
An operating rod disposed inside the rotating shaft so as to be movable along the axis;
A slide driving means disposed above the discharge elbow part and changing the blade angle of each wing part by moving the operation rod;
A vertical shaft pump installation structure comprising:
The discharge elbow part is provided with a pedestal for installing the slide driving means, and
An installation wall portion for positioning and installing the discharge elbow portion is provided at an upper portion of the water absorption tank, one end is fixed to the pedestal of the discharge elbow portion , and the other end is fixed to the installation wall portion, and the discharge elbow A vertical shaft pump installation structure characterized in that a support means for supporting the discharge elbow part from the opposite side to the discharge direction of the water flow from the part is provided. The installation structure of a vertical shaft pump according to claim 1, wherein the support means has a rigidity that can adjust the entire length and maintain the adjusted state . The support means is
A first shaft member having one end fixed to the discharge elbow,
A second shaft member, one end of which is fixed to the installation wall portion, and the shaft core is disposed so as to be coaxial with the shaft core of the first shaft member;
A connecting member that connects the other end of the first shaft member and the other end of the second shaft member so as to be able to separate and approach each other;
The installation structure of the vertical shaft pump according to claim 2, wherein the vertical shaft pump is provided with a telescopic member .

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