JP2015161170A - Submerged bearing box, submerged bearing device, and pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve mounting workability in a submerged bearing box, a submerged bearing device, and a pump.SOLUTION: A submerged bearing box is provided with: a supporting part 51 having a cylindrical shape inside which a submerged bearing 17 can be fitted; a plurality of ribs 52 radially connected to the outside of the supporting part 51; and a mounting part 53 connected to tip parts of the plurality of ribs 52 and having a ring shape that can be sandwiched between first and second casings 101 and 102.

Description

  The present invention relates to an underwater bearing box and an underwater bearing device that support an underwater bearing used in pumps such as an axial flow pump and a mixed flow pump, and a pump to which the underwater bearing device is applied.

  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 with the lower end opening of the pumping pipe submerged in water, the impeller rotates, so that the water flowing into the pumping pipe is pumped upward in the flow path. It is discharged through the bend pipe.

  In such a pump, the rotating shaft has an impeller fixed to the lower part, and is supported rotatably in the pumping pipe by an underwater bearing device at an upper part and an intermediate part. This underwater bearing device has an underwater bearing and an underwater bearing box, a rotating shaft is supported by the underwater bearing, and the underwater bearing is supported by the pumping pipe by the underwater bearing box. Examples of such underwater bearings include those described in Patent Document 1 below, and examples of underwater bearing boxes include those described in Patent Document 2 below.

JP 2002-031130 A JP 05-321886 A

  Conventionally, the underwater bearing box constituting the above-described underwater bearing device is in close contact with the inner surface of the pumping pipe, and is fixed by bolts from the outer side or the inner side of the pumping pipe. For this reason, it is troublesome to attach the submersible bearing box to the pumping pipe, and it is difficult to attach the submersible bearing box to an appropriate position of the pumping pipe, and there is a problem that the mounting workability is lowered.

  This invention solves the subject mentioned above, and it aims at providing the underwater bearing box, the underwater bearing apparatus, and the pump which aim at the improvement of attachment workability | operativity.

  To achieve the above object, the underwater bearing box of the present invention includes a cylindrical support portion into which the underwater bearing can be fitted, a plurality of ribs radially connected to the outside of the support portion, And an attachment portion having a ring shape that is connected to the tip portions of the plurality of ribs and can be sandwiched between a pair of casings.

  Therefore, the underwater bearing box is connected to the casing when the mounting portion is sandwiched between the pair of casings, so that the connection between the underwater bearing box and the casing can be facilitated and the workability of the mounting work can be improved. it can.

  In the underwater bearing box of the present invention, the attachment portion is characterized in that a positioning portion with respect to a radial direction is provided on a clamping surface by the pair of casings.

  Therefore, it is possible to position the attachment portion and the pair of casings with high accuracy in the radial direction by the positioning portion, and it is possible to connect the underwater bearing box and the casing with high accuracy.

  In the underwater bearing box of the present invention, the mounting portion is characterized in that a plurality of mounting holes through which the connecting bolt penetrates are formed at predetermined intervals in the circumferential direction while being sandwiched between the flange portions of the pair of casings. .

  Therefore, when connecting the submersible bearing box and the casing, the mounting portion is sandwiched between the flange portions of the pair of casings, and in this state, the connecting bolt is passed through and fastened to the underwater bearing box and the casing. Can be performed outside the casing, and the workability of the connecting operation between the underwater bearing box and the casing can be improved.

  In the underwater bearing box of the present invention, the support portion is characterized in that an upstream end portion in the fluid flow direction is formed in a tapered cross-sectional shape.

  Therefore, it can suppress that this support part obstructs the flow of fluid because the edge part of a support part is formed in a taper section shape.

  In the underwater bearing box of the present invention, the plurality of ribs are formed in a blade cross-sectional shape.

  Therefore, the rib can be prevented from obstructing the flow of fluid by being formed in the blade cross-sectional shape.

  In the underwater bearing box according to the present invention, the plurality of ribs are gradually narrowed from the support portion side toward the attachment portion side, and are formed in a line-symmetric shape in the width direction from the rib to the attachment portion. It is characterized by.

  Therefore, the underwater bearing box can support the rotating shaft in a well-balanced manner through the underwater bearing by forming the line symmetrically in the width direction from the rib to the mounting portion, and the underwater bearing box can be downsized. be able to.

  In the underwater bearing box according to the present invention, the mounting portion is formed with a plurality of temporary mounting screw holes at a predetermined interval in the circumferential direction in which the temporary connection bolt is screwed in a state where the flange portion of one of the casings is in contact. It is said.

  Therefore, by temporarily connecting one casing and the mounting portion with the temporary connecting bolt, the mounting portion and the two casings can be easily connected with the connecting bolt while the flange portion of the other casing is in contact with the mounting portion. It is possible to improve the workability of the connecting work between the underwater bearing box and the casing.

  Further, the underwater bearing device of the present invention is characterized in that an underwater bearing capable of rotatably supporting a rotating shaft inside is fixed to the support portion of the underwater bearing box.

  Therefore, the underwater bearing box is connected to the casing when the mounting portion is sandwiched between the pair of casings, so that the connection between the underwater bearing box and the casing can be facilitated and the workability of the mounting work can be improved. it can.

  The pump of the present invention includes a casing that is arranged along the vertical direction and has a suction port at the lower end side and a discharge port at the side, and a rotary shaft that is arranged in the casing along the vertical direction. And an impeller fixed to a lower end portion of the rotating shaft, and the underwater bearing device that rotatably supports the rotating shaft in the casing.

  Therefore, the underwater bearing box is connected to the casing when the mounting portion is sandwiched between the pair of casings, so that the connection between the underwater bearing box and the casing can be facilitated and the workability of the mounting work can be improved. it can.

  According to the underwater bearing box, the underwater bearing device, and the pump of the present invention, the ring-shaped mounting portion that can be sandwiched between the pair of casings is provided. As a result, the workability of the mounting work can be improved.

FIG. 1 is a longitudinal sectional view showing a pump to which the underwater bearing device of the present embodiment is applied. FIG. 2 is a cross-sectional view illustrating the underwater bearing device of the present embodiment. FIG. 3 is a plan view showing the underwater bearing box of the present embodiment. FIG. 4 is a cross-sectional view showing an underwater bearing box. FIG. 5 is a schematic view showing the mounting structure of the underwater bearing box.

  Exemplary embodiments of an underwater bearing box, an underwater bearing device, and 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 embodiment, and when there are two or more embodiments, what comprises combining each embodiment is also included.

  FIG. 1 is a longitudinal sectional view showing a pump to which the underwater bearing of the present embodiment is applied.

  In the present embodiment, as shown in FIG. 1, the vertical shaft pump 10 is fixed to a casing 13 provided with a suction port 11 and a discharge port 12, a rotating shaft 14 disposed in the casing 13, and a lower portion of the rotating shaft 14. And the underwater bearings 16 and 17 that rotatably support the rotary shaft 14 within the casing 13, and an underwater bearing box 18. The underwater bearing 17 and the underwater bearing box 18 constitute a bearing device 19.

  The casing 13 has a cylindrical shape, is disposed in a vertical direction in a mounting hole 22 formed in the mounting base 21, and is supported by suspension by mounting brackets 23 and 24. And as for the casing 13, the suction inlet 11 is formed because the suction bell 25 is fixed to the lower end side. The suction bell 25 has a bell mouth shape with a large diameter toward the suction side (downward). Further, the casing 13 is integrally formed with an elbow piping portion 26 at the upper portion, so that the discharge port 12 is formed at the side portion. The elbow pipe portion 26 forms a second flow path B that is curved at a substantially right angle from the first flow path A formed by the casing 13 along the substantially vertical direction. And the elbow piping part 26 finally becomes the substantially horizontal edge part which protrudes to the side of the casing 13, and the discharge pipe which is not shown in figure is connected.

  In the casing 13, a diffuser (static blade) 27 is fixed to the inner peripheral wall of the lower end portion. A first flow path A is formed between the diffuser 27 and the inner casing 28. The casing 13 has a rotating shaft 14 disposed therein, and the rotating shaft 14 is rotatably supported by a plurality of underwater bearings 16 and 17. The upper underwater bearing 16 is directly supported by the casing 13, and the lower underwater bearing 17 is supported by the casing 13 by an underwater bearing box 18. The impeller 15 is fixed to the lower end of the rotating shaft 14 so as to be integrally rotatable. The impeller 15 is disposed in the first flow path A. The rotating shaft 14 is drivingly connected to a driving device (motor and speed reducer) 30 via a shaft coupling 29 at the upper end.

  Therefore, when the drive device 30 is driven, the rotational force is transmitted to the rotary shaft 14 via the shaft coupling 29, and the rotary shaft 14 rotates. Then, the impeller 15 fixed to the lower end portion of the rotating shaft 14 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 upward in the first flow path A in the vertical direction, and after being reduced in pressure by the diffuser 27, is guided by the elbow piping section 26, thereby being in the second flow path B. In the horizontal direction and discharged from the discharge port 12 to the discharge pipe.

  Here, the underwater bearing box 18 and the underwater bearing device 19 described above will be described in detail.

  2 is a cross-sectional view illustrating the submersible bearing device of the present embodiment, FIG. 3 is a plan view illustrating the submersible bearing box of the present embodiment, FIG. 4 is a cross-sectional view illustrating the submersible bearing box, and FIG. It is the schematic showing the attachment structure of a box.

  The underwater bearing device 19 has an underwater bearing 17 and an underwater bearing box 18 as shown in FIG. The underwater bearing 17 has a sleeve 41 and a sliding member 42. The sleeve 41 has a cylindrical shape and includes a cylindrical portion 43 and an outer peripheral flange portion 44. That is, an outer peripheral flange portion 44 having a ring shape is integrally formed at one end portion in the axial direction of the cylindrical portion 43.

  The sliding member 42 is bonded to the inner peripheral surface of the sleeve 41. The sliding member 42 is made of rubber or synthetic resin, and is provided on the inner peripheral surface of the cylindrical portion 43 of the sleeve 41 by molding. Although not shown, the sliding member 42 is formed with a plurality of grooves along the axial direction on the inner peripheral surface at equal intervals in the circumferential direction.

  The underwater bearing box 18 includes a support portion 51, a plurality of ribs 52, and an attachment portion 53. As shown in FIGS. 3 and 4, the support portion 51 has a cylindrical shape, and a sleeve 41 constituting the underwater bearing 17 can be fitted inside. That is, in the support portion 51, a screw hole 61 in which a mounting screw (not shown) that is screwed through the outer peripheral flange portion 44 of the sleeve 41 is threaded to one end face (upper side in FIG. 4) in the circumferential direction or the like. A plurality of intervals are formed. Further, the support portion 51 has a tapered portion 62 formed on the outer peripheral surface side so that the upstream end portion (the lower end portion in FIG. 4) in the flow direction of water (fluid) is formed in a tapered cross-sectional shape. Yes. In addition, in order to form the edge part of the support part 51 in a tapered cross-sectional shape, it is good also considering the taper part 62 as a curved part.

  The ribs 52 are radially connected to the outer peripheral surface side of the support portion 51 (three in this embodiment), and the ribs 52 are arranged at equal intervals in the circumferential direction. Each end surface of the rib 52 is an inclined surface 71 so that the width gradually decreases from the support portion 51 side toward the attachment portion 53 side. Further, the rib 52 has a curved portion 72 formed at each end in the width direction so as to have a blade cross-sectional shape.

  The attachment portion 53 has a ring shape and is connected to the tip portions of the plurality of ribs 52. The attachment portion 53 can be sandwiched between a pair of first and second casings 101 and 102 constituting the casing 13, and the connection bolt 121 penetrates and is screwed into the nut 122, so that the attachment portion 53 is connected to the casing 13. It can be connected to the (first and second casings 101, 102).

  That is, the attachment portion 53 is formed with clamping surfaces 81 and 82 formed by the first and second casings 101 and 102, and positioning convex portions 83 and 84 as positioning portions in the radial direction are formed on the clamping surfaces 81 and 82. Yes. The positioning protrusions 83 and 84 are formed in the outermost peripheral portion of the sandwiching surfaces 81 and 82 so as to form a ring shape continuous in the circumferential direction. On the other hand, the first and second casings 101, 102 have flange portions 103, 104 formed at end portions in the axial center direction, and mounting surfaces 105, 106 that are in contact with the clamping surfaces 81, 82 of the mounting portion 53. Positioning recesses 107 and 108 are formed as positioning portions in the radial direction. The positioning recesses 107 and 108 are formed in the outermost peripheral portion of the mounting surfaces 105 and 106 so as to form a ring groove shape continuous in the circumferential direction.

  The mounting portion 53 has a plurality of mounting holes 85 formed at equal intervals in the circumferential direction along the axial direction of the underwater bearing housing 18. On the other hand, in the first and second casings 101 and 102, a plurality of mounting holes 109 and 110 along the axial direction are formed in the flange portions 103 and 104 at equal intervals in the circumferential direction. The mounting holes 85 of the mounting portion 53 and the mounting holes 109 and 110 of the first and second casings 101 and 102 are formed at substantially the same position in the circumferential direction and the radial direction, and the mounting portion 53 is the first and second casings. In a state of being sandwiched between 101 and 102, they are aligned on a straight line, the connecting bolt 121 passes through, and can be fastened by a nut 122.

  In the mounting portion 53, groove portions 86 and 87 are formed along the circumferential direction on the sandwiching surfaces 81 and 82, and O-rings 88 and 89 as seal members are attached to the groove portions 86 and 87, respectively. In a state where the mounting portion 53 is sandwiched between the first and second casings 101 and 102, the O-rings 88 and 89 are in close contact with the mounting surfaces 105 and 106 of the first and second casings 101 and 102. It is possible.

  The attachment portion 53 has a plurality of hanging tools 90 formed on the outer peripheral surface, and a hanging hole 91 is formed in the hanging tool 90.

  The underwater bearing box 18 is formed in a line-symmetric shape in the width direction (vertical direction in FIG. 4) from the rib 52 to the mounting portion 53. The underwater bearing box 18 is formed in a line-symmetric shape in the width direction (vertical direction in FIG. 4) except for the tapered portion 62 in the support portion 51.

  Further, as shown in FIG. 5, the mounting portion 53 includes a plurality of temporary mounting screw holes 92 at predetermined intervals in the circumferential direction in which the temporary connecting bolt 123 is screwed in a state where the flange portion 104 of one second casing 102 is in contact. Is formed. On the other hand, in the second casing 102, a plurality of temporary attachment holes 111 through which the temporary connection bolts 123 pass are formed in the flange portion 104 at predetermined intervals in the circumferential direction.

  The underwater bearing 17 configured as described above is supported by the underwater bearing box 18, and the underwater bearing box 18 is supported by the casing 13. That is, as shown in FIG. 2, in the underwater bearing 17, the cylindrical portion 43 of the sleeve 41 is fitted into the support portion 51 of the underwater bearing box 18, and the outer peripheral flange portion 44 is in contact with the end surface of the support portion 51. . The underwater bearing 17 is joined to the underwater bearing box 18 by a plurality of bolts (not shown) passing through the mounting holes of the outer peripheral flange portion 44 and screwing into the support portions 51 of the underwater bearing box 18. ing.

  When connecting the submersible bearing box 18 and the casing 13, first, the mounting surface 106 of the flange portion 104 of the second casing 102 is brought into close contact with the clamping surface 82 of the mounting portion 53 of the submersible bearing box 18. The second casing 102 can be temporarily connected to the submersible bearing box 18 by passing 123 through the temporary mounting hole 111 of the flange portion 104 and screwing into the temporary mounting screw hole 92 of the mounting portion 53. Next, the attachment surface 105 of the flange portion 103 of the first casing 101 is brought into close contact with the clamping surface 81 of the attachment portion 53 of the submersible bearing box 18, and in this state, as shown in FIG. The attachment portion 53 and the first and second casings 101 and 102 are fastened by inserting the nut 122 into the attachment hole 110 of the attachment portion 102, the attachment hole 85 of the attachment portion 53, and the attachment hole 109 of the first casing 101. The underwater bearing box 18 and the casing 13 can be connected.

  The underwater bearing 17 has the rotating shaft 14 disposed in the sliding member 42, and can support the rotating shaft 14 in water in a rotatable manner.

  As described above, in the underwater bearing box of the present embodiment, the cylindrical support portion 51 into which the underwater bearing 17 can be fitted inside, and the plurality of ribs 52 that are radially connected to the outside of the support portion 51. And a mounting portion 53 having a ring shape that is connected to the tip portions of the plurality of ribs 52 and can be sandwiched between the pair of first and second casings 101 and 102.

  Therefore, the underwater bearing box 18 is connected to the casing 13 (the first and second casings 101 and 102) by the attachment portion 53 being sandwiched between the first and second casings 101 and 102, so The connection between the box 18 and the casing 13 can be facilitated, and the workability of the mounting work can be improved.

  In the underwater bearing box of this embodiment, the mounting portion 53 is provided with positioning projections 83 and 84 in the radial direction on the clamping surfaces 81 and 82 formed by the first and second casings 101 and 102. Accordingly, it becomes possible to position the mounting portion 53 and the first and second casings 101 and 102 with high accuracy in the radial direction by the positioning convex portions 83 and 84, and high accuracy between the underwater bearing box 18 and the casing 13. Connection can be made possible.

  In the underwater bearing box of this embodiment, the mounting hole 53 through which the connecting bolt 121 passes is provided in the mounting portion 53 in a state where the mounting portion 53 is sandwiched between the flange portions 103 and 104 of the first and second casings 101 and 102. A plurality are formed at predetermined intervals in the circumferential direction. Therefore, when connecting the submersible bearing box 18 and the casing 13, the mounting portion 53 is held between the flange portions 103 and 104 of the first and second casings 101 and 102, and in this state, the mounting holes 85, 109, and 110 are held. The underwater bearing box 18 and the casing 13 can be connected outside the casing 13 by passing through the connecting bolt 121 and tightened with the nut 122, and the underwater bearing box 18 and the casing 13 can be connected. Workability can be improved.

  In the underwater bearing box of this embodiment, the upstream end of the support 51 in the fluid flow direction is formed in a tapered cross-sectional shape. Therefore, by making the end portion of the support portion 51 have a tapered cross-sectional shape, it is possible to suppress the support portion 51 from obstructing the flow of the fluid and to ensure a good flow of the fluid.

  In the underwater bearing box of the present embodiment, the plurality of ribs 52 are formed in a blade cross-sectional shape. Therefore, the rib 52 can be prevented from obstructing the flow of the fluid, and a good flow of the fluid can be ensured.

  In the underwater bearing box of this embodiment, the plurality of ribs 52 are gradually narrowed from the support portion 51 side toward the attachment portion 53 side, and are formed in a line-symmetric shape in the width direction from the rib 52 to the attachment portion 53. . Therefore, the underwater bearing box 18 can support the rotating shaft 14 in a balanced manner via the underwater bearing 17, and the underwater bearing box 18 can be downsized.

  In the underwater bearing box of this embodiment, a plurality of temporary mounting screw holes 92 into which the temporary connecting bolts 123 are screwed in a state where the flange portion 104 of the second casing 102 is in contact are formed at predetermined intervals in the circumferential direction of the mounting portion 53. Yes. Therefore, by temporarily connecting the second casing 102 and the mounting portion 53 with the temporary connecting bolt 123, the mounting portion 53 and the first and second mounting portions 53 are in contact with the mounting portion 53. The casings 101 and 102 can be easily connected by the connecting bolt 121, and the workability of the connecting work between the underwater bearing box 18 and the casing 13 can be improved.

  Further, in the underwater bearing device of the present embodiment, the underwater bearing 17 capable of rotatably supporting the rotating shaft 14 is fixed to the support portion 51 of the underwater bearing box 18. Therefore, the underwater bearing box 18 is connected to the casing 13 when the mounting portion 53 is sandwiched between the first and second casings 101 and 102, thereby facilitating the connection between the underwater bearing box 18 and the casing 13. The workability of the mounting work can be improved.

  Further, in the pump of the present embodiment, the casing 13 is arranged 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, and the casing 13 has the vertical direction. A rotating shaft 14 disposed along the impeller 15, an impeller 15 fixed to the lower end of the rotating shaft 14, and an underwater bearing device 19 that rotatably supports the rotating shaft 14 within the casing 13 are provided.

  Therefore, the underwater bearing box 18 is connected to the casing 13 when the mounting portion 53 is sandwiched between the first and second casings 101 and 102, thereby facilitating the connection between the underwater bearing box 18 and the casing 13. The workability of the mounting work can be improved.

  In the above-described embodiment, the submersible bearing box and the submersible bearing device of the present invention have been described as applied to the vertical shaft pump 10, but may be applied to another pump, and the rotation that supports the rotating shaft in water. It can also be applied to machines.

DESCRIPTION OF SYMBOLS 10 Vertical shaft pump 11 Suction port 12 Discharge port 13 Casing 14 Rotating shaft 15 Impeller 16, 17 Underwater bearing 18 Underwater bearing box 19 Underwater bearing device 25 Suction bell 26 Elbow piping part 27 Diffuser 30 Drive device 41 Sleeve 42 Sliding member 51 Support Part 52 rib 53 mounting part 62 taper part 81,82 clamping surface 83,84 positioning convex part (positioning part)
85 Mounting hole 88, 89 O-ring 92 Temporary mounting screw hole 101 First casing 102 Second casing 103, 104 Flange portion 105, 106 Mounting surface 107, 108 Positioning recess 109, 110 Mounting hole 111 Temporary mounting hole 121 Connecting bolt 122 Nut 123 Temporary connection bolt A 1st flow path B 2nd flow path

Claims (9)

A cylindrical support that can be fitted with an underwater bearing;
A plurality of ribs radially connected to the outside of the support portion;
An attachment portion that is connected to the tip portions of the plurality of ribs and has a ring shape that can be sandwiched between a pair of casings;
An underwater bearing box characterized by comprising:   The underwater bearing box according to claim 1, wherein the attachment portion is provided with a positioning portion in a radial direction on a sandwiching surface of the pair of casings.   3. The mounting portion according to claim 1, wherein a plurality of mounting holes through which the connecting bolt penetrates are formed at predetermined intervals in the circumferential direction while being sandwiched between the flange portions of the pair of casings. The underwater bearing box described.   The underwater bearing box according to any one of claims 1 to 3, wherein the support portion has an end portion on the upstream side in the fluid flow direction having a tapered cross-sectional shape.   The underwater bearing box according to any one of claims 1 to 4, wherein the plurality of ribs are formed in a blade cross-sectional shape.   The plurality of ribs are formed to have a line-symmetric shape in a width direction from the ribs to the attachment portion, with a width gradually decreasing from the support portion side toward the attachment portion side. The underwater bearing box according to claim 5.   The said attachment part is formed with a plurality of temporary attachment screw holes at predetermined intervals in the circumferential direction in which the temporary connection bolt is screwed in a state where the flange part of one of the casings is in contact. The underwater bearing box according to claim 6.   An underwater bearing device, wherein an underwater bearing capable of rotatably supporting a rotating shaft inside is fixed to the support portion of the underwater bearing box according to any one of claims 1 to 7. . 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 rotating shaft disposed along the vertical direction in the casing;
An impeller fixed to the lower end of the rotating shaft;
The underwater bearing device according to claim 8, wherein the rotating shaft is rotatably supported in the casing.
The pump characterized by having.

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