JPH0533754Y2 - - Google Patents

Description

[Detailed explanation of the idea]

【0001】

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump bracket for mounting a pump having a plurality of impellers on a drive shaft rotated by a drive machine.

[0002]

2. Description of the Related Art Generally, in a multi-stage pump, the number of stages is increased by stacking intermediate casings containing impellers. By doing so, standardization and commonization can be achieved relatively regardless of the number of stages, and the number of parts can be reduced. However, when the number of pump stages increases or decreases,
Naturally, the capacity of the drive device, such as the motor, also increases or decreases. Since the dimensions of the drive casing are then changed, the bracket that connects to the casing of the multistage pump must be changed.

[0003] The suction port of a multi-stage pump is provided on the opposite side of the driver, so the discharge port is located on the driver side. Therefore, the discharge casing must be connected to the driver casing. Various techniques for connecting the discharge casing to the driver casing directly or via a bracket are known, and are disclosed in, for example, Japanese Patent Application Laid-Open No. 57-91395, Japanese Patent Publication No. 57-55914, and Japanese Utility Model Application Laid-Open No. 58-180095. However, none of these known techniques can be adapted to changes in the dimensions of the driver casing. In addition, Japanese Patent Application Laid-Open No. 58-202393 discloses a technique for attaching a specific pump to a specific motor, but since part of the motor casing is used as a pump part, a motor casing that matches the pump specifications must be prepared.

【0004】

[Problem that the invention attempts to solve] Therefore,
An object of the present invention is to provide a pump bracket that does not require changing the discharge casing even if the capacity of the drive machine changes by increasing or decreasing the number of impeller stages.

[0005]

[Means for Solving the Problems] According to the present invention, in a pump bracket for mounting a pump having a plurality of impellers on the drive shaft rotated by the drive machine, the impellers adjacent to the bracket The car has an intake port on the opposite side of the bracket,
It has a main body extending in the axial direction, and has a flange bent in the radial direction at one end of the main body,
The flange is fixed to the casing of the drive machine,
The other end has a flat part adjacent to the impeller and perpendicular to the axis, an inclined part radially inward of the flat part, and a drive shaft shaft sealing device radially inward of the inclined part. is housed therein, has a flange fixed to the discharge casing by fixing means, and supports a differential user provided radially outward of the impeller.

[0006]

[Description of the function and effect of the invention] Therefore, even if the capacity of the drive machine changes and the dimensions of the drive machine casing change, the dimensions of the pump discharge casing will not change. It is sufficient to prepare several types of brackets with different flange dimensions. Furthermore, the bracket can be adapted by simply changing the shape of the flange attached to the drive machine casing and, if necessary, the shape of the main body, without changing the dimensions of the flange flat part, inclined part, etc. fixed to the discharge casing.

[0007] The flat portion can be installed sufficiently close to the impeller, and as a result, the axial thrust generated on the impeller can be reduced, and the discharge efficiency of the impeller can be improved.

[0008] Furthermore, since it supports a differential user, it is easy to assemble.

[0009] As described above, according to the present invention, it is possible to cope with changes in the number of stages of a multistage pump, the brackets can be easily removed, and the number of brackets to be prepared can be relatively small. Additionally, the bracket is easy to install, and the number of parts required for the multistage pump can be reduced.

【0010】

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

[0011] Figure 1 shows an example of a multistage pump equipped with a bracket according to the present invention. In Figure 1, a flange 2 formed at one end in the axial direction of a bracket 1 according to the present invention has a A motor or electric motor 3 is connected by a fixing means or a bolt 4 passing through a bolt hole 2a. That is, the bracket 1 has a generally cylindrical shape as a whole as shown in FIG. 2, and includes a substantially cylindrical main body part 1a extending in the axial direction and having the flange 2 at the end, and a main body part 1a having a main body part 1a extending from the suction casing 13 side. A flat portion 1b extending radially inward at right angles to the axis;
It consists of a conical portion 6 extending in a conical shape from the inner end in the radial direction of b to the electric motor 3 side. The drive shaft 5 of the electric motor 3 passes through an opening O at the center of the conical part 6 of the bracket 1, and is supported by a sealing device, for example, a mechanical seal 7, provided in the penetrating part and housed in the conical part 6. The liquid seal is now measured. Further, a bolt hole 1d is provided in a flange 1c provided on the main body portion radially outward of the bracket 1, and the discharge casing 8 is connected with a fixing means such as a bolt 9.
and electric motor 3 are connected by bracket 1,
Further, the discharge casing 8 and the bracket 1 form a discharge chamber.

[0012] On the other hand, on the side of the bracket 1 facing the electric motor 3, three impellers 11 are fixed to the drive shaft 5 in the illustrated example, and radially outward of the final stage impeller. A differential user 10 is supported by a bracket 1. An intermediate casing 12 is provided so as to surround the impellers 11, and one end of the intermediate casing 12, that is, the electric motor 3
A suction casing 13 is attached to the opposite side, and each impeller 11 is rotated by the drive shaft 5 of the electric motor 3, sucking liquid from the suction casing 13,
It is designed to be discharged from a discharge casing 8. In these configurations, the sealing device is not limited to the mechanical seal 7, but may also be a gland packing, and although the drive method shown in the figure is a direct drive type, it is not limited to this.
For example, the connection may be made by a flange, or the sealing device may be a mechanical seal or a gland packing as a direct connection type.

[0013] With this configuration, even if the capacity of the electric motor 3 is different, it is only necessary to prepare one with a different dimension of the flange 2 of the bracket 1, and the shaft diameter of the drive shaft 5 of the electric motor 3 can be changed. When the size of the casing changes, it is only necessary to change the dimensions of the mechanical seal 7 without changing the dimensions of the other casings. Furthermore, when assembling a multi-stage centrifugal pump according to the present invention, the motor 3, the bracket 1, and the intermediate casing 12 of the final stage impeller 11 (the third stage in the illustrated example) are assembled, and then the discharge casing 8 is assembled.
However, before assembling the discharge casing 8, the length B in the axial direction between the suction side surface of the flange 1c of the bracket body 1 and the suction side surface of the flat part 1b is determined.
(this length is known in advance), measure the length C in the axial direction between the suction side surface of the flange 1c and the motor side surface of the final stage impeller 11, and find the difference C- B=δ can be determined. Therefore, it is easy to measure the gap δ.

[0014]

[Effects of the invention] As explained above, according to the invention, the discharge casing and the drive machine are connected by a bracket equipped with a sealing device, so that the capacity of the drive machine can be increased by changing the number of stages of the impeller. Even if there is a change, it can be accommodated by simply changing the drive unit mounting part of the bracket, and it can also accommodate changes in the shaft diameter. Therefore, the number of types of parts connecting the drive machine and the discharge casing can be reduced, and the structure can be simplified. Further, since the bracket forms a part of the discharge casing, the shape of the discharge casing can be simplified, and the gap δ can be easily measured. As a result, costs can be reduced.

[0015] Since the flat part of the bracket serves as a so-called casing cover, the number of parts is small and it is lightweight, and since the bracket is provided on the opposite side of the impeller from the suction port of the impeller. , the bracket does not form a flow path to the impeller, and the bracket has a simple structure with fewer parts.

[0016] Furthermore, since the suction port of the impeller adjacent to the bracket is on the side opposite to the bracket, the suction passage of the impeller is not formed in the bracket.
The structure becomes simpler and the gap δ can be made smaller. If the gap δ is wide, an axial thrust force acts on the impeller, and especially in multi-stage pumps, the thrust force is added to each impeller and becomes a large value, but by forming a narrow gap, the thrust force generated on the bearing can be reduced. can.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a multistage pump to which the bracket of the present invention is applied.

FIG. 2 is a sectional view of a bracket implementing the present invention.

[Explanation of symbols]

1...Bracket 1a...Main part 1b...Plane part 1c...Flange 1d...Bolt hole 2...Flange 2a...Bolt hole 3...Electric motor 4...Bolt 5...Drive shaft 6...Slope part 7...Mechanical seal 8...Discharge casing 9...Bolt 10…Diff user 11... Impeller 12...Intermediate casing 13...Suction casing.

Claims (1)

[Scope of utility model registration request] Claim 1: A pump bracket for mounting a pump having a plurality of impellers on a drive shaft rotated by the drive machine, wherein the impeller adjacent to the bracket has a suction port on the opposite side of the bracket. and has a main body extending in the axial direction, and has a radially bent flange at one end of the main body, the flange being fixed to the casing of the drive shaft, and the other end adjacent to the impeller. has a flat part perpendicular to the axis, has an inclined part radially inward of the flat part, a shaft sealing device for the drive shaft is accommodated in the radial inner part of the inclined part, and is fixed to the discharge casing. 1. A pump bracket having a flange secured by means for supporting a diffuser provided radially outwardly of an impeller.