JP2015161171A - Submerged bearing and pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve durability by suppressing separation between a sleeve and a slide member in a submerged bearing and a pump.SOLUTION: The submerged bearing includes: a sleeve 41 having a tubular shape; a slide member 42 bonded to an inner peripheral surface of the sleeve 41; and engagement parts 43, 44 for engaging end parts of the sleeve 41 and the slide member 42 in an axial center direction with each other.

Description

  The present invention relates to a submerged bearing used for pumps such as an axial flow pump and a mixed flow pump, and a pump to which the submerged bearing 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 while the lower end opening of the pumping pipe is submerged in the water, the impeller rotates and water flowing into the pumping pipe is pumped up in the flow path. And discharged through the bend pipe.

  In such a pump, the impeller is fixed to the lower part of the rotary shaft, and is supported rotatably in the pumping pipe by the underwater bearings at the upper part and the intermediate part. This underwater bearing is configured by adhering a cylindrical sliding member made of rubber to the inner surface of a metal or synthetic resin outer cylinder. In the underwater bearing, the outer cylinder is supported by the pumping pipe via the bearing box, and the rotating shaft is rotatably supported inside the rubber sliding member via water. Examples of such underwater bearings include those described in the following patent documents.

JP 2002-031130 A

  The underwater bearing described above is configured by adhering a rubber sliding member to the inner surface of the outer cylinder, and this rubber sliding member supports the rotating shaft so as to be rotatable in water. For this reason, the rubber sliding member is peeled off from the outer cylinder when used for a long period of time or when water enters between the outer cylinder and the rubber sliding member and the frictional resistance with the rotating shaft rotating at high speed increases. It becomes easy to do. When the rubber sliding member is peeled from the outer cylinder, it is difficult for the underwater bearing to properly support the rotating shaft, and the pump performance is degraded.

  The present invention solves the above-described problems, and an object thereof is to provide an underwater bearing and a pump that improve the durability by suppressing the peeling between the sleeve and the sliding member.

  In order to achieve the above object, an underwater bearing according to the present invention includes a cylindrical sleeve, a sliding member bonded to the inner peripheral surface of the sleeve, and an axial direction of the sleeve and the sliding member. It has a latching part which latches end parts, It is characterized by the above-mentioned.

  Therefore, the sleeve and the sliding member are slid with respect to the sleeve even if the sliding member slides with the rotating shaft supported inside by the end portions in the axial direction being locked by the locking portion. A member becomes difficult to peel and durability can be improved.

  In the underwater bearing of the present invention, the locking portion includes a dovetail groove along the circumferential direction formed on one of the inner surface of the sleeve and the outer surface of the sliding member, the inner surface of the sleeve, and the sliding member. And a protrusion formed on either one of the outer surfaces and fitted into the dovetail groove.

  Therefore, by forming the locking portion with the dovetail groove and the protruding portion, it is possible to easily suppress the peeling between the sleeve and the sliding member with a simple configuration.

  In the underwater bearing according to the present invention, a plurality of the locking portions are provided at end portions in the axial direction of the sleeve and the sliding member.

  Therefore, by providing a plurality of locking portions at the end portions of the sleeve and the sliding member, the peel strength between the sleeve and the sliding member can be improved.

  The underwater bearing according to the present invention is characterized in that a waterproof film is provided at a boundary portion between the sleeve and the sliding member.

  Therefore, the waterproof film prevents water from entering the boundary between the sleeve and the sliding member, and can suppress the peeling between the sleeve and the sliding member.

  In the underwater bearing of the present invention, the sleeve is provided with an outer peripheral flange portion at one end portion in the axial direction, and a plurality of mounting holes are formed in the outer peripheral flange portion.

  Therefore, for example, when the sleeve is fitted and supported in the bearing housing, the outer peripheral flange portion is in close contact with the end surface of the bearing housing, and the bolt penetrates the mounting hole and is screwed into the bearing housing, thereby Can be easily mounted on a box.

  The underwater bearing according to the present invention is characterized in that a screw hole for a push-up bolt is formed in the outer peripheral flange portion.

  Therefore, when replacing the underwater bearing, with the sleeve of the underwater bearing fitted into the bearing housing, the push-up bolt is screwed into the screw hole for the push-up bolt and the tip is pressed against the bearing housing. The sleeve can be easily pulled out, and the workability of replacing the underwater bearing can be improved.

  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 that rotatably supports the rotating shaft in the casing.

  Therefore, by applying the underwater bearing as the bearing that supports the rotating shaft, it is possible to improve the durability by suppressing the separation between the sleeve constituting the underwater bearing and the sliding member, and to extend the life of the pump. It can be.

  According to the submersible bearing and the pump of the present invention, since the locking portion that locks the end portions in the axial direction of the sleeve and the sliding member constituting the submersible bearing is provided, the sleeve and the sliding member are separated. In addition to improving the durability, it is possible to extend the life of the pump.

FIG. 1 is a longitudinal sectional view showing a pump to which the underwater bearing of the present embodiment is applied. FIG. 2 is a cross-sectional view illustrating the underwater bearing of the present embodiment. FIG. 3 is a plan view illustrating the underwater bearing of the present embodiment. FIG. 4 is a cross-sectional view illustrating a flange portion of the underwater bearing. FIG. 5 is a cross-sectional view showing the lower part of the underwater bearing.

  Exemplary embodiments of a submersible bearing 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 this 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 rotating shaft 14 within the casing 13.

  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 a 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 increases, so that water enters the casing 13 from the suction port 11. Inhaled. Then, the water sucked into the casing 13 flows upward in the vertical direction in the first flow path A, 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 submerged bearing 17 mentioned above is demonstrated in detail.

  2 is a cross-sectional view illustrating the submersible bearing of the present embodiment, FIG. 3 is a plan view illustrating the submersible bearing of the present embodiment, FIG. 4 is a cross-sectional view illustrating the flange portion of the submersible bearing, and FIG. It is sectional drawing.

  As shown in FIGS. 2 and 3, the underwater bearing 17 includes a sleeve 41, a sliding member 42, and locking portions 43 and 44. The sleeve 41 has a cylindrical shape and includes a cylindrical portion 51 and an outer peripheral flange portion 52. That is, an outer peripheral flange portion 52 having a ring shape is integrally formed at one end portion in the axial direction of the cylindrical portion 51.

  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 51 of the sleeve 41 by molding. In the sliding member 42, a plurality of grooves 53 along the axial direction are formed on the inner peripheral surface at equal intervals in the circumferential direction.

  End portions of the sleeve 41 and the sliding member 42 in the axial direction are locked by locking portions 43 and 44. The locking portions 43 and 44 are provided with grooved grooves 61 and 62 formed on the inner peripheral surface of the cylindrical portion 51 of the sleeve 41 along the circumferential direction, and protrusions formed on the outer peripheral surface of the sliding member 42 along the circumferential direction. Parts 63 and 64. That is, by molding a rubber material or a synthetic resin material on the inner peripheral surface of the cylindrical portion 51, the protruding portions 63 and 64 of the sliding member 42 are locked to the dovetail grooves 61 and 62 of the cylindrical portion 51. .

  As shown in FIG. 4, a plurality (two in this embodiment) of the locking portions 43 are provided on the outer peripheral flange portion 52 side of the cylindrical portion 51. That is, the cylindrical portion 51 is formed on the inner peripheral surface of one end portion in the axial direction, and the groove 61 is formed along the circumferential direction. Has been. On the other hand, the sliding member 42 has a protruding portion 63 formed along the circumferential direction on the outer peripheral surface of one end portion in the axial direction, and two protruding portions 63 are provided at predetermined intervals in the axial direction of the sliding member 42. Is formed. Each projection 63 is locked by being fitted in each dovetail groove 61.

  Further, as shown in FIG. 5, a plurality (two in this embodiment) of the locking portions 44 are provided on the opposite side of the outer peripheral flange portion 52 in the cylindrical portion 51. That is, the cylindrical portion 51 is formed on the inner peripheral surface of one end portion in the axial direction, and a groove 62 is formed along the circumferential direction. Has been. On the other hand, the sliding member 42 is formed with a protruding portion 64 along the circumferential direction on the outer peripheral surface of the other end portion in the axial direction, and the protruding portion 64 is 2 at a predetermined interval in the axial direction of the sliding member 42. Individually formed. Each protrusion 64 is engaged with each dovetail groove 62 to be locked.

  In this embodiment, as the locking portions 43 and 44, grooves 61 and 62 are formed on the inner peripheral surface of the sleeve 41, and protrusions 63 and 64 are formed on the outer peripheral surface of the sliding member 42. The configuration is not limited. For example, the grooves 61 and 62 may be formed on the outer peripheral surface of the sliding member 42, and the protrusions 63 and 64 may be formed on the inner peripheral surface of the sleeve 41. Further, the shapes and numbers of the dovetail grooves 61 and 62 and the protrusions 63 and 64 are not limited to this embodiment, and may be set as appropriate according to the size and shape of the underwater bearing 17. Further, although the locking portions 43 and 44 are provided at the end portions of the sleeve 41 and the sliding member 42 in the axial direction, another locking portion may be provided at an intermediate portion in the axial direction.

  As shown in FIGS. 4 and 5, the underwater bearing 17 is provided with waterproof films 55 and 56 at the boundary between the sleeve 41 and the sliding member 42. Since the boundary lines B1 and B2 are formed at the ends of the underwater bearing 17 in the axial center direction, the waterproof films 55 and 56 are solidified by applying a waterproof material so as to cover the boundary lines B1 and B2. Thus, the waterproof films 55 and 56 are formed. The waterproof films 55 and 56 are extended to the inner surface of the sleeve 41 and the end surface of the sliding member 42 so that the boundary lines B1 and B2 are covered. Note that. As the waterproof material constituting the waterproof films 55 and 56, for example, an epoxy resin, a marine star 30G (trade name: registered trademark) or Bioclin (trade name: registered trademark) which is an antifouling paint is used.

  Further, as shown in FIGS. 2 and 3, the underwater bearing 17 has a plurality of mounting holes 71 formed in the outer peripheral flange portion 52 of the sleeve 41. The attachment holes 71 are through-holes along the axial direction of the sleeve 41, and a plurality (eight in this embodiment) are formed along the circumferential direction of the sleeve 41 at a predetermined interval (equal interval). Each mounting hole 71 includes a through portion 71a through which the shaft portion 72a of the mounting bolt 72 passes and a counterbore portion 71b into which the head 72b of the mounting bolt 72 enters. Further, the underwater bearing 17 has a push-up bolt screw hole 73 formed in the outer peripheral flange portion 52 of the sleeve 41. The push-up bolt screw holes 73 are through-holes along the axial direction of the sleeve 41, and a plurality (two in this embodiment) are formed at predetermined intervals (equal intervals) along the circumferential direction of the sleeve 41. ing.

  In the underwater bearing 17, the cylindrical portion 51 of the sleeve 41 is fitted into the support portion 18a of the bearing housing 18, and the outer peripheral flange portion 52 is in contact with the end surface of the support portion 18a. The underwater bearing 17 is joined to the bearing housing 18 by a plurality of mounting bolts 72 passing through the mounting holes 71 of the outer peripheral flange portion 52 and screwing into the support portion 18a of the bearing housing 18.

  The underwater bearing 17 can be replaced by being removed from the bearing box 18. At this time, first, the joint between the underwater bearing 17 and the bearing housing 18 is released by loosening and removing the plurality of mounting bolts 72. Next, as shown in FIG. 4, a plurality of push-up bolts 74 are screwed into the push-up bolt screw holes 73 of the outer peripheral flange portion 52, and the tip is brought into contact with the end surface of the support portion 18 a of the bearing box 18. . And the underwater bearing 17 can be extracted from the support part 18a of the bearing box 18 by rotating each screw hole 73 for push-up bolts continuously.

  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.

  In addition, although the underwater bearing 17 was demonstrated here, the underwater bearing 16 similarly has a sleeve, a sliding member, and a latching | locking part. In the vertical shaft pump 10, the rotary shaft 14 is rotatably supported by the underwater bearings 16 and 17, but may be supported by a plurality of underwater bearings 17.

  As described above, in the underwater bearing of the present embodiment, the sleeve 41 having a cylindrical shape, the sliding member 42 bonded to the inner peripheral surface of the sleeve 41, and the axial center of the sleeve 41 and the sliding member 42. Locking portions 43 and 44 for locking the end portions in the direction are provided.

  Therefore, the sleeve 41 and the sliding member 42 are slid with the rotary shaft 14 supported inside by the sliding member 42 being locked by the locking portions 43 and 44 at the ends in the axial direction. However, the sliding member 42 is difficult to peel off from the sleeve 41, and the durability of the sliding member 42 can be improved by preventing the sliding member 42 from being deteriorated.

  In the underwater bearing of the present embodiment, the locking portions 43 and 44 are formed on the outer circumferential surfaces of the dovetail grooves 61 and 62 along the circumferential direction formed on the inner circumferential surface of the sleeve 41 and the sliding members 41 and 42. Protrusions 63 and 64 that fit into the dovetail grooves 61 and 62 are provided. Therefore, by forming the locking portions 43 and 44 with the dovetail grooves 61 and 62 and the protrusions 63 and 64, it is possible to easily prevent the sleeve 41 and the sliding member 42 from being peeled off with a simple configuration.

  In the underwater bearing of the present embodiment, a plurality of locking portions 43 and 44 are provided at the axial end portions of the sleeve 41 and the sliding member 42. Therefore, the peeling strength between the sleeve 41 and the sliding member 42 can be improved by providing a plurality of the locking portions 43 and 44 at the ends of the sleeve 41 and the sliding member 42.

  In the underwater bearing of the present embodiment, waterproof films 55 and 56 are provided on the boundary lines B1 and B2 between the sleeve 41 and the sliding member 42. Accordingly, the waterproof films 55 and 56 prevent water from entering the boundary lines B1 and B2 between the sleeve 41 and the sliding member 42, and can suppress the peeling between the sleeve 41 and the sliding member 42.

  In the underwater bearing of the present embodiment, the sleeve 41 is configured by providing the outer peripheral flange portion 52 at one end portion in the axial direction of the cylindrical portion 51, and a plurality of mounting holes 71 are formed in the outer peripheral flange portion 52. Therefore, when the cylindrical portion 51 of the sleeve 41 is fitted and supported by the support portion 18a of the bearing housing 18, the outer peripheral flange portion 52 comes into close contact with the end surface of the support portion 18a, and the mounting bolt 72 penetrates each mounting hole 71. The sleeve 41 can be easily attached to the bearing housing 18 by being screwed into the support portion 18a.

  In the underwater bearing of the present embodiment, a screw hole 73 for a booster bolt is formed in the outer peripheral flange portion 52. Therefore, when the underwater bearing 17 of the bearing housing 18 is replaced, the push-up bolt 74 is screwed into the push-up bolt screw hole 73 in a state where the sleeve 41 is fitted to the support portion 18a of the bearing housing 18, and the tip is supported by the support portion. By pressing against 18a, the underwater bearing 17 can be easily extracted with respect to the bearing housing 18, and the workability | operativity of the replacement | exchange operation | work of an underwater bearing 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 underwater bearings 16 and 17 that rotatably support the rotating shaft 14 within the casing 13 are provided.

  Therefore, by applying the underwater bearing 17 as a bearing that supports the rotating shaft 14, the durability between the sleeve 41 and the sliding member 42 constituting the underwater bearing 17 can be suppressed and the durability can be improved. It is possible to increase the life of ten.

  In the above-described embodiment, the submersible bearing of the present invention is applied to the vertical shaft pump 10, but may be applied to another pump, and may also be applied to a rotary machine that supports the rotating shaft in water. be able to.

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 Bearing box 25 Suction bell 26 Elbow piping part 27 Diffuser 30 Drive device 41 Sleeve 42 Sliding member 43, 44 Locking part 51 Cylindrical part 52 Peripheral flange part 55, 56 Waterproof film 61, 62 Dovetail groove 63.64 Projection part 71 Mounting hole 73 Screw hole for push-up bolt A A 1st flow path B 2nd flow path

Claims (7)

A cylindrical sleeve,
A sliding member bonded to the inner surface of the sleeve;
A locking portion that locks the ends of the sleeve and the sliding member in the axial direction;
An underwater bearing characterized by comprising:   The engaging portion is formed on a groove formed along a circumferential direction formed on one of the inner surface of the sleeve and the outer surface of the sliding member, and on the other of the inner surface of the sleeve and the outer surface of the sliding member. The underwater bearing according to claim 1, further comprising: a protrusion that is fitted into the dovetail groove.   The underwater bearing according to claim 1, wherein a plurality of the locking portions are provided at end portions in the axial direction of the sleeve and the sliding member.   The underwater bearing according to any one of claims 1 to 3, wherein a waterproof film is provided at a boundary portion between the sleeve and the sliding member.   5. The sleeve according to claim 1, wherein an outer peripheral flange portion is provided at one end in the axial direction, and a plurality of mounting holes are formed in the outer peripheral flange portion. Underwater bearing.   The underwater bearing according to claim 5, wherein a screw hole for a push-up bolt is formed in the outer peripheral flange portion. 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 according to any one of claims 1 to 6, wherein the rotary shaft is rotatably supported in the casing.
The pump characterized by having.

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