JP2013076330A - Seal mounting structure and multistage pump device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal mounting structure and a multistage pump device in which a gap can be reduced between pump casings in assembling the pump casings.SOLUTION: The multistage pump device 1 includes: a motor 10; a rotary shaft 12 connected to the motor 10; a plurality of impellers 31 provided in the rotary shaft; an annular seal member 35 having its cross section formed into a triangle shape; the casings 32 which are layered on each other, and are formed to store the impellers 31 and the rotary shaft 12, wherein the layered casings form an annular storage space 50 allowing to store the seal member 35 having its cross section formed into the triangle shape.

Description

  The present invention relates to a seal mounting structure for stacked pump casings and a multistage pump device.

  Currently, multistage pump devices having a plurality of impellers and pump casings are known. As such a multistage pump device, a submersible pump (for example, Patent Document 1) that pumps hot water such as water, hot spring water, and seawater in a well or the like, a feed pump that pumps water to a high place, and the like are known.

  The multistage pump device is configured by stacking pump casings containing impellers with a seal member such as an O-ring interposed. Therefore, in the pump casing, a storage space for attaching the seal member is formed at a portion engaging with each other, and the outer surface of the casing constituting the storage space and the seal member are in close contact with each other so that the stacked pump casings can be connected to each other. A hermetic seal mounting structure is provided.

Japanese Utility Model Publication No. 6-8791

  The above-described seal mounting structure and multistage pump device have the following problems. That is, in the multistage pump device described above, the impeller and the pump casing are provided in multiple stages, so that the increased water pressure becomes high. For this reason, a hard seal member having a hardness of 30 or the like is used. For this reason, in the assembly of the multistage pump device, when the pump casings are sequentially stacked via the seal member, a gap due to the seal member is generated between the pump casing and the pump casing. Since this gap increases according to the number of stages of the pump casing, there is a problem that the height dimension when the pump casings are stacked increases. In particular, an impeller nut that fixes a plurality of impellers is fastened to the rotating shaft. However, since the stacked height of the pump casing is increased, there is a possibility that the rotating shaft and the impeller nut cannot be fastened.

  Accordingly, an object of the present invention is to provide a seal mounting structure and a multistage pump device that can reduce a gap between pump casings when the pump casing is assembled.

  In order to solve the problems and achieve the object, the seal mounting structure and the multistage pump device of the present invention are configured as follows.

  As one aspect of the present invention, the seal mounting structure is formed so that a cross section of the annular seal member is formed in a triangular shape, and can be stacked on each other, and by stacking, the seal member can be stored. A casing in which an annular storage space having a triangular cross section is formed.

  As one aspect of the present invention, a multistage pump device includes a motor, a rotary shaft connected to the motor, a plurality of impellers provided on the rotary shaft, and an annular seal member having a triangular cross section. The annular impeller and the rotary shaft are formed so that the impeller and the rotating shaft can be accommodated, and an annular storage space capable of storing the sealing member having a triangular cross section is formed by stacking. A casing.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the seal attachment structure and multistage pump apparatus which can reduce the clearance gap between pump casings at the time of the assembly of a pump casing.

BRIEF DESCRIPTION OF THE DRAWINGS Explanatory drawing which shows the structure of the multistage pump apparatus which concerns on one embodiment of this invention in a partial cross section. Sectional drawing which shows the principal part structure of the multistage pump device. Sectional drawing which shows the principal part structure of the multistage pump device.

Hereinafter, a multistage pump device 1 according to an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is an explanatory view showing a part of a configuration of a multi-stage pump device 1 according to an embodiment of the present invention, and FIG. FIG. 3 is a cross-sectional view showing the configuration of the pump casing 32 and the seal member 35. 1 and 2, B represents a bolt, F represents a fluid flow, N represents a nut, V represents a well, and W represents well water.

  As shown in FIG. 1, the multistage pump device 1 includes a submersible motor 10, a suction casing 11, a rotating shaft 12, a pump unit 13, a discharge casing 14, a fixed band 15, and an electric cable 16. ing. The multistage pump device 1 is, for example, a deep well submersible pump disposed in the well V and at least a part of which is located below the surface of the fluid in the well V, for example, the well water W.

  The submersible motor 10 is connected to an external power source via an electric cable 16. In the submersible motor 10, the drive shaft 20 of the submersible motor 10 is connected to the rotary shaft 12 via a joint 21 or the like, for example.

  The suction casing 11 is provided in the upper part of the submersible motor 10 and is disposed as the lowest stage of the pump unit 13. The suction casing 11 is formed in a substantially cylindrical shape, and is provided at the lower portion of the assembly seat 23 to be assembled by the outer member (motor casing) of the submersible motor 10 and the bolt B, and the upper portion of the assembly seat 23. The suction port 24 includes an upper end engaging portion 25 that is provided on the outer peripheral edge of the upper end portion (upper end side) and engages a pump casing 32 described later, and an insertion groove 26 to which one of the fixing bands 15 is fixed. Yes. The upper end engaging portion 25 is formed in the same shape as a second engaging portion 49 described later.

  The rotary shaft 12 is connected to the submersible motor 10 via a joint 21 and is housed in the suction casing 11 and the pump unit 13. The rotating shaft 12 is formed so that an impeller 31 of a pump unit 13 to be described later can be fixed. For example, the outer peripheral surface of the rotary shaft 12 is supported by the bearing member 34 of the pump unit 13.

  For example, the outer peripheral surface of the rotating shaft 12 is covered with a covering portion, and the covering portion forms a substantial outer surface of the rotating shaft 12. The covering portion is constituted by, for example, a spacer 28 and an insertion portion 36 of an impeller 31 described later, and is fixed to the outer peripheral surface of the rotating shaft 12 so as to be able to rotate following the rotation of the rotating shaft 12.

  A plurality of pump parts 13 are fixed to the upper part of the suction casing 11 and are formed so that the rotary shaft 12 can be accommodated therein. More specifically, the pump unit 13 includes a plurality of impellers 31 fixed to the rotating shaft 12 and a pump casing (casing) 32 that houses the impellers 31. The pump unit 13 includes a liner ring 33 provided between the impeller 31 and the pump casing 32, a bearing member provided between the rotary shaft 12 and the pump casing 32, and a seal member between the pump casing 32. 35. Further, the pump unit 13 includes a seal attachment structure having a seal member 35 and a storage space 50 for storing the seal member 35.

  As shown in FIG. 1, the pump unit 13 may include a casing 32 a that does not house the impeller 31 and forms only the fluid flow path F between the pump casings 32.

  The impeller 31 is molded from stainless steel, resin, or the like, and is provided at the center of the disk-like base portion. The rotary shaft 12 is inserted and fixed, and a part of the outer surface of the rotary shaft 12 is fixed. The insertion part 36 to cover, the some blade | wing provided in one main surface of the base part, and the shroud which covers this blade | wing and the center part opens larger diameter than the insertion part 36 are provided.

  The insertion portion 36 is provided integrally with the base portion, and is formed in a cylindrical shape that covers a part of the outer peripheral surface of the rotating shaft 12 as a covering portion. The outer peripheral surface of the insertion portion 36 is formed to be slidable with the bearing member.

  The pump casing 32 is formed in a cylindrical shape with a bottom, and the suction casing 11 and the pump casing 32 or the casing 32 a located on the primary side and the secondary side of the suction casing 11 can be stacked via a seal member 35.

  Specifically, as shown in FIG. 2, the pump casing 32 is provided with a side portion 41 that forms a shell and a vane that forms a flow path to the pump portion 13 in the next stage, which are formed in a substantially cylindrical shape. A flow path portion.

  The pump casing 32 is provided at the lower end portion of the suction casing 11 or the side portion 41, and is connected to the lower (primary side) suction casing 11, the pump casing 32 or the casing 32a, and the upper portion thereof. A (secondary side) pump casing 32, a casing 32 a, or a second engaging portion 49 that engages with the first engaging portion 48 of the discharge casing 14. The pump casing 32 is formed so that a plurality of stages can be stacked by engaging the first engaging portion 48 and the second engaging portion 49 with each other.

  The first engaging portion 48 is an end portion disposed on the lower end side of the side portion 41, more specifically, a cylindrical end portion, and has a seal groove 48a on the inner peripheral surface and the end portion thereof. .

  The seal groove 48 a is a chamfered portion formed on both the lower surface and the inner peripheral surface of the side portion 41. In other words, the seal groove 48a is an annular notch whose cross-sectional shape is formed in a triangular shape at a ridge portion on the inner peripheral side thereof.

  The second engagement portion 49 is an annular notch that has a square cross section and engages with the first engagement portion 48. The second engaging portion 49 opposes the seal groove 48a of the first engaging portion 48 with which the ridge 49a is engaged, and forms a storage space 50 for the seal member 35 together with the seal groove 48a.

  In other words, the second engaging portion 49 is an end portion disposed on the upper end side of the side portion 41, and the end surface is formed to have a lower height on the outer peripheral side than the inner peripheral side, and the outer peripheral surface thereof. To the first engaging portion 48, which is formed to have substantially the same width as the first engaging portion 48 in the same shape as the first engaging portion 48. Further, in the second engaging portion 49, a ridge portion 49a formed by an outer peripheral end surface and an outer peripheral surface extending from the end surface forms a seal groove.

  The first engaging portion 48 and the second engaging portion 49 form a storage space 50 for storing the seal member 35 by the outer surfaces of the seal groove 48a and the ridge portion 49a.

  The seal member 35 is an annular packing having a triangular cross section and a curved ridge. The outer peripheral surface of the seal member 35 is formed on an inclined surface formed at substantially the same inclination angle as the seal groove 48a. The seal member 35 has an inner diameter that is substantially the same as the outer diameter of the second engagement portion 49.

  The seal member 35 has a hardness of, for example, 30. Such a seal member 35, the first engagement portion 48, and the second engagement portion 49 constitute a seal mounting structure.

  The discharge casing 14 includes, for example, a lower casing 61 to which the other of the fixed band 15 is fixed, and an upper casing 62 having a flange portion 62a connected to the lower casing 61 by a bolt B or the like and connected to a discharge pipe or the like. ing. The discharge casing 14 includes a first engagement portion 48 at the lower end thereof. The discharge casing 14 includes a check valve 63 in the upper casing 62.

  The fixed band 15 has a band-shaped band portion 65 and screw portions 66 formed at both ends so as to be fastened by nuts N. The fixed band 15 is formed so that the suction casing 11, the pump casing 32 and the discharge casing 14 can be fixed.

  As shown in FIGS. 2 and 3, the multistage pump device 1 configured as described above is configured so that the inclined surface of the seal member 35 faces the seal groove 48a when the pump casings 32 are stacked as shown in FIGS. After inserting the seal member 35 into the second engaging portion 49, the pump casing 32 is laminated.

  The pump casing 32 forms a seal groove 48 a with an inclined surface, and forms a mounting space for the seal member 35 having a triangular cross section by the seal groove 48 a and the ridge 49 a of the second engaging portion 49. The sealing member 35 having a triangular cross section is accommodated in the container. Therefore, the laminated pump casing 32 is as close as possible to the laminated primary pump casing 32 by abutting the inclined surface of the seal groove 48a and the inclined outer surface of the seal member 35. Thereby, it is possible to reduce a gap generated between the adjacent pump casings 32 by the seal member 35.

  In particular, in a multi-stage pump device, since a plurality of pump casings are stacked, a seal member having a high hardness (hard) is used. Therefore, a gap is generated between the pump casings, and the pump casings increase as the number of stages increases. The gap generated between them increases.

  However, according to the seal mounting structure of the present embodiment, the seal member 35 having a triangular cross section is accommodated in the mounting space of the seal member 35 having a triangular cross section. With such a configuration, when the multistage pump device 1 is assembled, the gap between the pump casings 32 generated in the pump unit 13 is reduced as much as possible, so that even if a hard seal member 35 is used, the assembly by the gap is performed. It is possible to prevent an increase in the dimension in the height direction at the time. In addition, since the cross-sectional shapes of the seal member 35 and the storage space 50 are triangular, the contact area between the seal member 35 and the first engagement portion 48 and the second engagement portion 49 can be secured, so that the sealing performance. Can be maintained.

  As described above, according to the multistage pump device 1 according to the embodiment of the present invention, the provision of the seal member 35 and the seal groove 48a having a triangular cross-sectional shape enables the pump casings to be located at the time of assembly of the pump casings. It is possible to reduce the gap.

  The present invention is not limited to the above embodiment. In the example mentioned above, although the multistage pump apparatus 1 demonstrated the structure which is a submersible pump, it is not limited to this. The multistage pump device 1 may be a pump laid on land. In other words, the multistage pump device 1 can be appropriately set as long as a plurality of pump casings 32 are stacked via the seal member 35. In addition, various modifications can be made without departing from the scope of the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Multistage pump apparatus, 10 ... Submersible motor (motor), 11 ... Suction casing, 12 ... Rotary shaft, 13 ... Pump part, 14 ... Discharge casing, 15 ... Fixed band, 16 ... Electric cable, 20 ... Drive shaft, 21 DESCRIPTION OF SYMBOLS ... Joint, 23 ... Assembly seat, 24 ... Suction port, 25 ... Upper end fitting part, 26 ... Insertion groove, 28 ... Spacer, 31 ... Impeller, 32 ... Pump casing, 32a ... Casing, 33 ... Liner ring, 34 ... Bearing member 35 ... Sealing member 36 ... Insertion part 41 ... Side part 48 ... First engagement part 48a ... Seal groove 49 ... Second engagement part 49a ... Ridge part 50 ... Storage space 61 ... lower casing, 62a ... flange part, 62 ... upper casing, 63 ... check valve, 65 ... band part, B ... bolt, F ... flow path, N ... nut, V ... well, W ... well water.

Claims (6)

An annular sealing member whose cross section is formed in a triangular shape;
A casing that is formed so as to be capable of being stacked on each other, and is formed so as to be capable of storing the seal member by stacking, and an annular storage space having a triangular cross section is formed.
A seal mounting structure comprising: The casing is provided with a first engaging portion provided on one end side thereof, and a second engaging portion provided on the other end side so as to be engageable with the first engaging portion of the casing to be stacked. Comprising
The seal mounting structure according to claim 1, wherein the storage space is formed by the first engaging portion and the second engaging portion that are engaged with each other by the casings that are stacked on each other.   The storage space includes an inclined surface formed on an end surface and an inner peripheral surface of the first engagement portion, and an annular shape engageable with the first engagement portion formed on the second engagement portion. The seal mounting structure according to claim 2, wherein the seal mounting structure is formed by a notch. A motor,
A rotating shaft connected to the motor;
A plurality of impellers provided on the rotating shaft;
An annular sealing member whose cross section is formed in a triangular shape;
A casing that can be stacked on each other and that can store the impeller and the rotating shaft, and that forms a ring-shaped storage space that can store the sealing member that has a triangular cross section by stacking. When,
A multi-stage pump device comprising: The casing is provided with a first engaging portion provided on one end side thereof, and a second engaging portion provided on the other end side so as to be engageable with the first engaging portion of the casing to be stacked. Comprising
5. The multistage pump device according to claim 4, wherein the storage space is formed by the first engagement portion and the second engagement portion that engage with each other of the casings stacked on each other.   The storage space includes an inclined surface formed on an end surface and an inner peripheral surface of the first engagement portion, and an annular shape engageable with the first engagement portion formed on the second engagement portion. The multistage pump device according to claim 5, wherein the multistage pump device is formed by a notch.

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