JP5083899B2 - Horizontal axis pump equipment - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a horizontal axis pump facility in which a horizontal axis pump is installed on an installation structure, and more particularly to a horizontal axis pump facility that is suitable for use in correcting deformation of a casing of a horizontal axis pump after installation. .

  Conventionally, the horizontal axis pump equipment is used for various drainage equipment (for example, flood drainage equipment, sewer stormwater drainage equipment, etc.) and various pumping equipment. For example, as shown in FIG. 3 of Patent Document 1, this type of horizontal axis pump facility is a horizontal axis pump in which an impeller is housed in a horizontally placed cylindrical casing, and the suction side is a suction water tank (suction water channel). ), And the discharge side is installed on site so that the discharge side is connected to the discharge water tank (discharge water channel). And if an impeller is rotationally driven, the fluid will be transferred in the casing toward a discharge water tank (discharge water channel) from a suction water tank (suction water channel).

By the way, this type of conventional horizontal shaft pump has a suction port diameter of about φ4000 mm, for example, and is quite heavy. The heavy casing is deformed by its own weight from the beginning of installation, and is gradually deformed due to aging, for example, an elliptical shape and the like, and cannot return to the dimension at the time of machining. In particular, when the above deformation occurs in the outer peripheral portion of the impeller of the casing, the clearance dimension between the impeller tip of the impeller and the inner peripheral surface of the casing becomes larger (or smaller) than the clearance dimension at the time of design (when the pump is installed). As a result, the operation efficiency of the pump decreases, or the impeller tip of the impeller and the inner peripheral surface of the casing come into contact with each other.
JP 2004-190567 A

  The present invention has been made in view of the above-described points, and an object of the present invention is to easily and surely correct (correct) an impeller outer peripheral side portion of a casing of a horizontal shaft pump that has been deformed due to its own weight or aging. Thus, it is an object of the present invention to provide a horizontal axis pump facility that can prevent a reduction in operating efficiency of the pump or contact between the impeller tip and the casing.

  The invention according to claim 1 is a horizontal shaft pump having a structure in which an impeller is housed in a horizontally placed casing, and fluid is transferred from the suction side to the discharge side of the casing by rotationally driving the impeller. In the horizontal axis pumping equipment installed on the installation structure, a tension pressing mechanism for correcting the deformation of the casing is installed by pulling or pressing the outer peripheral side portion of the casing from the outside in the radial direction of the casing. It is in the horizontal axis pump equipment characterized by this.

  The invention according to claim 2 of the present application is the horizontal axis pump facility according to claim 1, wherein the tension pressing mechanism is installed at at least the left and right positions and the bottom position of the outer peripheral side portion of the impeller of the casing. It is in a horizontal axis pumping facility characterized by

  The invention according to claim 3 of the present application is the horizontal axis pump facility according to claim 1 or 2, wherein the installation structure has a wall surface facing an outer peripheral side portion of the casing, and the tension pressing mechanism is The horizontal axis pump facility is installed between the wall surface and the impeller outer peripheral side portion of the casing.

  According to the first aspect of the present invention, the deformation of the outer peripheral side portion of the casing of the horizontal shaft pump deformed due to its own weight, aging, or the like can be easily changed to the original shape (the shape at the time of machining) by the tension pressing mechanism. Therefore, the operation efficiency of the pump can always be maintained in a good state.

  According to the second aspect of the present invention, the impeller outer peripheral side portion of the casing is pulled or pressed at at least three points of the left and right sides and the bottom thereof, so that the deformation of the impeller outer peripheral side portion is easily and reliably corrected. be able to.

  According to the invention described in claim 3, since the tension pressing mechanism is installed between the wall surface of the installation structure (casing) for installing the horizontal shaft pump and the casing, the tension pressing mechanism reliably supported by the installation structure. Thus, the casing can be reliably pulled and pressed.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is an overall schematic configuration diagram of a horizontal axis pump facility 1 according to an embodiment of the present invention. FIG. 2 is a schematic sectional view taken along the line AA of FIG. As shown in both figures, the horizontal axis pump facility 1 is configured by installing a horizontal axis pump 10 in an installation structure 100. Each component will be described below.

  In this example, a cylindrical pump (tubular pump) in which the entire pump is installed as a straight water channel is used as the horizontal axis pump 10. The horizontal shaft pump 10 is a cylindrical casing (hereinafter referred to as “outer casing”) 11 that is partially embedded and installed in a horizontal state in the installation structure 100, and is rotated by a drive unit 13 inside the outer casing 11. And an impeller 15 to be driven. The drive unit 13 includes a drive machine (electric motor) 17 inside an inner casing 21 in the outer casing 11, and a speed reducer that reduces the rotational speed of the drive machine 17 as necessary and transmits the power to the impeller 15. 19. The impeller 15 is configured by attaching a plurality of impellers 25 to the outer periphery of the impeller hub 23, and a suction side inner casing 27 is attached to the front (suction side) thereof. An inlet vane 29 is attached around the suction side inner casing 27, and a guide vane 31 is attached around the inner casing 21. The outer casing 11 may be made of a steel plate or a casting.

  On the other hand, in this example, the installation structure 100 is constituted by a frame such as concrete, and a suction water tank 101 and a discharge water tank 103 are installed on both sides thereof. The installation structure 100 has the horizontal shaft 10 installed by embedding the outer peripheral portion on the suction side and the outer peripheral portion on the discharge side of the outer casing 11, and a part of the outer casing 11 is exposed in the middle portion. A chamber 105 is provided. In the chamber 105, an impeller outer peripheral side portion 11A that houses at least the impeller 15 of the outer casing 11 is located, and a manhole 12 provided in the outer casing 11 in front (suction side) of the impeller 15 is also provided in the chamber 105. Located in. The manhole 12 is for a measurer to enter the outer casing 11 when measuring a gap between the inner peripheral surface of the outer peripheral side portion 11 </ b> A of the outer casing 11 and the tip of the impeller 25 of the impeller 15. .

  As shown in FIG. 2, wall surfaces 107 of the installation structure 100 are positioned so as to face the left and right side surfaces and the bottom surface of the outer peripheral side portion 11A of the outer casing 11, respectively. A tension pressing mechanism 50 is installed between each side portion 11A.

  Both ends of the tension pressing mechanism 50 are fixed to the wall surface 107 and the impeller outer peripheral portion 11A, and the space between the wall surface 107 and the impeller outer peripheral portion 11A of the outer casing 11 (impeller outer peripheral portion 11A). It is a mechanism that pulls or presses in the radial direction.

  3 and 4 show specific examples of the tension pressing mechanism 50. FIG. 3 shows the tension pressing mechanism by the screw mechanism 50-1 and FIG. 4 shows the turn buckle mechanism 50-2. In other words, the screw mechanism 50-1 is provided on the wall surface 107 side of the installation structure 100 using the anchor bolts 52 and the like, and the fixing stay 51 of the fixing jig 51 and the outer peripheral portion 11 A of the outer casing 11. The screw rod 57 is inserted into the mounting stay 55 fixed to the side surface, nuts 59 are attached to the upper and lower surfaces of the mounting stays 53, 55 of the inserted screw rod 57, and both nuts 59 are rotated to rotate both. In this structure, the distance between the mounting stays 53 and 55 is changed by pulling or pressing, that is, approaching or separating. In this example, in order to prevent the nut 59 from loosening and to securely fix its position, the nuts 59 of both the mounting stays 53 and 55 have a double nut structure.

  On the other hand, the turnbuckle mechanism 50-2 is fixed to the mounting stay 61 fixed to the wall surface 107 side of the installation structure 100 using an anchor bolt 68 or the like, and the outer surface of the outer peripheral portion 11A of the impeller of the outer casing 11. A pair of screw members 69, 69 each having a threaded rod 65 standing on a mounting base 67 are screwed onto a threaded nut 65 of a pair of threaded members 65, 69. The two mounting bases 67 are fixed to the mounting stays 61 and 63, respectively. Since one screw rod 65 is reversely threaded, the space between the mounting stays 61 and 63 is pulled or pressed according to the direction of rotation of the nut 71, that is, approached or separated. Can be changed.

  In the horizontal axis pump facility 1 configured as described above, when the drive unit 17 is driven, the impeller 15 is rotated via the speed reducer 19 and water in the suction water tank 101 is sucked from the suction port 111 of the outer casing 11. Then, it passes through the impeller 25 and the guide vane 31 and is discharged from the discharge port 113 into the discharge water tank 103.

  On the other hand, the heavy outer casing 11 of the horizontal axis pump equipment 1 is deformed from the initial installation due to its own weight as described above, and gradually deforms from a perfect circle due to the influence of vibration, stress, etc. due to operation. For example, it becomes an elliptical shape. In particular, when the deformation occurs in the impeller outer peripheral portion 11A of the outer casing 11, as described above, the clearance dimension between the tip of the impeller 25 of the impeller 15 and the inner peripheral surface of the outer casing 11 (impeller outer peripheral portion 11A) is as follows. It becomes larger (or smaller) than the gap size at the time of design (when the pump is installed), and the operation efficiency of the pump is reduced, or the tip of the impeller 25 of the impeller 15 and the inner peripheral surface of the outer casing 11 come into contact with each other. End up. Therefore, in this horizontal axis pump facility 1, when deformation occurs in the impeller outer peripheral side portion 11A of the outer casing 11, the impeller outer peripheral side portion 11A is operated by operating the three sets of tensile pressing mechanisms 50. An external force that pulls or presses the outer casing 11 in the radial direction from the outside is applied, thereby returning (correcting) the impeller outer peripheral portion 11A to an original shape close to a perfect circle. For example, in FIG. 2, when the impeller outer peripheral side portion 11 </ b> A is deformed to expand its horizontal diameter in the left and right direction and contracts in the vertical and vertical direction, the length of the left and right tensile pressing mechanisms 50 is extended to increase the outer casing 11. The outer casing 11 is pulled downward by reducing the length of the lower tension pressing mechanism 50, thereby making it possible to bring the impeller outer peripheral portion 11A closer to a perfect circle. Thus, if the impeller outer peripheral portion 11A is pulled or pressed at three points, that is, the left and right sides and the bottom, the deformation of the impeller outer peripheral portion 11A can be corrected easily and reliably.

  As a result, the gap between the inner peripheral surface of the impeller outer peripheral side portion 11A of the outer casing 11 and the tip portion of the impeller 25 can be set as an optimal (equal) gap in any portion in the circumferential direction. The operating efficiency of the horizontal axis pump 10 can be always maintained in a good state. In particular, according to the horizontal axis pump facility 1, the tension pressing mechanism 50 is installed between the wall surface 107 of the installation structure (frame) 100 on which the horizontal axis pump 10 is installed and the outer casing 11 (the impeller outer peripheral portion 11A). Therefore, the outer casing 11 (impeller outer peripheral portion 11A) can be pulled and pressed while the installation structure 100 reliably supports the tension pressing mechanism 50, and the outer casing 11 (impeller outer peripheral portion 11A) is deformed. Can be corrected reliably.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible. Note that any shape, structure, or material not directly described in the specification and drawings is within the scope of the technical idea of the present invention as long as the effects and advantages of the present invention are exhibited. For example, in the above example, the present invention is applied to a cylindrical pump (tubular pump). However, the present invention is not limited to this, and the present invention is not limited to this. The same can be applied.

  The structure of the tension pressing mechanism 50 is not limited to the structure shown in FIGS. 3 and 4. For example, various link mechanisms, rack and pinion mechanisms, mechanisms using wires and ropes, hydraulic (water pressure) mechanisms, motors Various mechanisms such as a mechanism using, or a combination of these can be applied.

  Further, in the above example, the tension pressing mechanism 50 is installed at three positions, that is, the left and right positions and the bottom position on the outer side of the outer peripheral portion 11A of the impeller.

  In the above example, the tension pressing mechanism is installed between the wall surface 107 of the installation structure 100 and the impeller outer peripheral portion 11A of the outer casing 11, but instead of the wall surface 107, for example, a steel member protruding from the installation structure 100 is used as the blade. The outer peripheral side portion of the impeller may be installed in various other structures, for example, the tension pressing mechanism 50 may be installed between the steel member and the outer peripheral side portion 11A of the impeller. A tensile pressing mechanism 50 may be installed around 11A.

1 is an overall schematic configuration diagram of a horizontal axis pump facility 1. FIG. It is a schematic sectional drawing of the AA part of FIG. It is a figure which shows the specific example (screw mechanism 50-1) of the tension | pulling press mechanism 50. FIG. It is a figure which shows the specific example (turn buckle mechanism 50-2) of the tension | pulling press mechanism 50. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Horizontal axis pump equipment 10 Horizontal axis pump 11 Outer casing 11A Impeller outer peripheral side part 13 Drive part 15 Impeller 17 Drive machine (electric motor)
19 Reduction gear 23 Impeller hub 25 Impeller 50 Tensile pressing mechanism 50-1 Screw mechanism 50-2 Turnbuckle mechanism 100 Installation structure 107 Wall surface

Claims (3)

A horizontal shaft in which a horizontal shaft pump is installed in the installation structure, in which the impeller is housed in a horizontally placed casing and fluid is transferred from the suction side to the discharge side of the casing by rotating the impeller. In pump equipment,
A horizontal axis pumping facility comprising a tension pressing mechanism for correcting deformation of the casing by pulling or pressing the outer peripheral side portion of the impeller of the casing from the outside in the radial direction of the casing. In the horizontal axis pump equipment according to claim 1,
The horizontal axis pump facility, wherein the tension pressing mechanism is installed at least at a left and right position and a bottom position on an outer peripheral side portion of the impeller of the casing. In the horizontal axis pump equipment according to claim 1 or 2,
The installation structure has a wall surface facing an impeller outer peripheral side portion of the casing,
The said horizontal axis pump installation characterized by the said tension press mechanism being installed between the impeller outer peripheral side part of this wall surface and a casing.

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