JPH0196492A - Multiple stage pump - Google Patents

Abstract

PURPOSE:To facilitate the preservation and inspection of a multiple stage pump by mounting an impeller on an impeller shaft to form a rotary section, while interconnecting guide vanes to form a fixed section and constituting one impeller unit from the combination of rotary and fixed sections. CONSTITUTION:A fit hole 26b in a second stage impeller 26 and a fit hole 30b in a first stage impeller 30 are aligned with each other, and a rotational force of an impeller shaft 37 is transmitted to both impellers 26, 27 to form a rotary section with these impellers and shaft. A second stage guide vane 27 has a water path 27b, guide pin 27d, partition wall plate 28, guide cylinder section 27c, etc., to form a fixed section together with a first stage guide vane 29. One impeller unit is constituted from the combination of these rotary and fixed sections.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a multistage pump, and more particularly, to a multistage centrifugal pump suitable for use in pumping water, for example.

[Conventional technology]

In conventional multistage pumps, an impeller is fitted onto the rotating shaft, then a guide vane is fixed to the bracket, and then, after the impeller is fitted onto the rotating shaft, another guide impeller is stacked on the guide vane on the bracket side. It consists of

Incidentally, related pumps of this type include, for example, Utility Model Publication No. 49-23762.

[Problem that the invention seeks to solve]

Maintenance and inspection of such conventional multistage pumps is very troublesome because each part must be removed from the rotating shaft one by one.

[Means for solving problems]

The present invention has been made to solve such problems.

A first aspect of the present invention is a multistage pump having a plurality of impellers and guide vanes arranged in the axial direction, in which the impeller is attached to an impeller shaft to form a rotating part, and the guide vanes are connected. The multi-stage pump is characterized in that a rotating part is formed by the rotating part, one impeller unit is formed by the combination of the rotating part and the fixed part, and the impeller shaft is attached to the rotating shaft of an electric motor.

A second means of the present invention is a multistage pump in which a plurality of impellers and guide vanes are arranged in the axial direction, in which the impeller is attached to the impeller shaft to form a rotating part, and a water channel is formed between the guide vanes. A fixed part is formed by connecting the rotating part and the fixed part with a partition wall plate made of a porous material interposed therebetween, and the rotating part and the fixed part constitute one impeller unit, and the impeller shaft is attached to the rotating shaft of the electric motor. This is a multi-stage pump characterized by the following.

A third means of the present invention is a multi-stage pump having a plurality of impellers and guide vanes arranged in the axial direction, in which a disc part is formed at one end of the impeller shaft, and a second stage impeller is mounted on this disc part. The rear shroud is installed so that it is in surface contact with the rear shroud, and there is a spacer between the first stage impeller and the second stage impeller, so that the disc part of this spacer is in surface contact with the rear shroud of the first stage impeller. The impeller shaft, both impellers, and the spacer form a rotating part, and the guide vanes are connected to form a fixed part, and the rotating part and the fixed part form one impeller. The multi-stage pump is characterized in that the impeller shaft is attached to the rotating shaft of an electric motor.

[Effect]

According to such a multistage pump, in a multistage pump having a plurality of impellers and guide vanes arranged in the axial direction, the impeller is attached to the impeller shaft to form a rotating part, and the guide vanes are connected to form a fixed part. The rotating part and the fixed part are combined to form one impeller unit, and the impeller shaft is attached to the rotating shaft of the electric motor, so one impeller unit can be attached from the rotating shaft with one operation. , maintenance and inspection can be carried out at a convenient location.

Furthermore, since the guide vanes are connected to each other by interposing a partition wall plate made of a porous material having a water channel between them, weight reduction and noise reduction can be achieved.

Furthermore, a disc part is formed at one end of the impeller shaft, and the rear shroud of the second stage impeller is attached to this disc part so as to be in surface contact with the disc part, and the first stage impeller and the second stage impeller are connected to each other. The disk part of this spacer is brought into surface contact with the rear shroud of the first stage impeller with a spacer in between, and since a rotating part is formed including the spacer, it is possible to suppress the runout of both impellers, and Each impeller can be shared.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 to 4.

First, an installation example of a pump device equipped with the pump of the present invention will be explained based on FIG. 4. The pump device 5 includes a first pump 6, a second pump 7, a control box 8. It consists of 9 Wakamizu vessels. From the water pipe 1 to the water tank 3 via the ball tap 2
Water is stored in the tank 3, and the water tank 3 is communicated with a first pump 6 through a water supply pipe 4. First pump 6 and second pump 7
are connected in parallel. The discharge sides of the first pump 6 and the second pump 7 are communicated with a large number of discharge faucets 11 via discharge pipes 10 . A water storage container 9 is installed at the inlet of the discharge pipe 1o.
are being communicated.

Thus, when use is started in a state where the amount of water used from the discharge faucet 11 is small, the first pump 6 is operated first. When the discharge faucet 11 is no longer used, the first pump 6 is stopped. Next, when the water usage is restarted again in a state where the amount of water used is small, the second pump 7 is operated, and when the use is stopped, the second pump 7 is stopped.

Operation in which this is repeated is called alternate operation. Further, when a large number of discharge faucets 11 are opened and a large amount of water is used, both the first pump 6 and the second pump 7 are operated in parallel. These controls are performed by the control box 8. Incidentally, the first pump 6 and the second pump 7 having the same performance are generally used. In such a pump device 5, unless the first pump 6 and the second pump 7 are repaired, maintained and inspected in a short time, many of the discharge faucets 11 will become unusable.

The first pump 6 or the second pump 7 of the pump device 5 is constructed as shown in FIGS. 1 to 3. A rotating shaft 22 protrudes from a bracket 23 that forms one side of the electric motor 21 . An impeller shaft 37, which constitutes a part of the rotating part of the impeller unit 15, is screwed to the tip of the rotating shaft 22. A shaft sealing device 24 is interposed between the impeller shaft 37 and the bracket 23, which constitute a part of the rotating portion side of the impeller unit 15. The fixed part side of the impeller unit 15 has a backing 3 between the housing 31 and the bracket 23.
It is clamped through 9.40.

The impeller unit 15 will be explained. A disk portion 37a is formed at one end of the cylindrical portion 37b of the impeller shaft 37;
It makes surface contact with the rear shroud of the stage impeller 26 to reduce vibration.

A threaded portion 37c is formed on the outer periphery of the other end of the cylindrical portion 37b, into which a nut 38 is screwed. Cylindrical part 3
A flat portion 37d (Fig. 2) is formed on the outer peripheral surface of 7b, and
Fitting hole 26b of stage impeller 26 and first stage impeller 30
It is fitted in a shape that matches the fitting hole 30b of the impeller shaft 3.
The rotational force of 7 is transmitted to both impellers 26 and 27. A guide portion 37e and a threaded portion 37f for screwing and fixing to the rotating shaft 22 are formed on the inner periphery of the cylindrical portion 37b. The second stage guide vane 27 has the second stage impeller 2 on its negative side.
6 discharge water guide vanes 27a are formed, a water channel 27b for guiding the discharge water of the first stage impeller 30 to the suction side of the second stage impeller 26 is formed on the other side, and a guide pin 27d is formed on one side of the outermost circumference.
A guide cylindrical portion 27c for coaxially fitting the partition wall plate 28 and the first stage guide vane 29 is formed on the other side, and a circular hole 27e is formed in the center. The spacer 44 has a disk portion 44a that is in surface contact with the rear shroud 30a of the -th stage impeller 3o. The partition plate 28 directs water discharged from the first stage guide vane 29 to the second stage guide vane 2.
A water channel 28a communicating with the water channel 27b of No. 7 is formed, a circular hole 28b is formed in the center, and an appropriate number of protrusions 28c extending in the axial direction are formed on the outer periphery. The first stage guide vane 29 has a circular hole 29a formed in the center, and an appropriate number of protrusions 29b extending in the axial direction formed on the outer periphery. A protrusion 25a extending in the axial direction is formed on the outer periphery of the presser plate 25.

Thus, to assemble the impeller unit 15, the second stage impeller 26 is fitted onto the impeller shaft 37. Next.

The second-stage guide vane 27 is arranged so as to surround the second-stage impeller 26, and the guide cylindrical portion 27c of the second-stage guide vane 27
Insert the bulkhead plate 28 so that it is concentric with the second stage guide vane 27.
They fit together using the protrusion 28c on the outer periphery. By providing the projections 28c, the problem of dimensional accuracy can be solved even if the separator 28c is made of synthetic resin, and a porous material can be used. If you use porous material! The amount is 30%, and noise reduction can be achieved. Next, the spacer 44 is attached to the impeller shaft 3.
After fitting the first stage impeller 3o to the impeller shaft 37, the nut 38 is screwed into the threaded portion 37c of the impeller shaft 37, and the nut 38 and the disk portion 37a of the impeller shaft 37 are connected.
and the first stage impeller 30° spacer 44. The impeller unit 15 is sandwiched between the second stage impeller 26 and the second stage impeller 26.
It constitutes the rotating part of. Thereafter, the first stage guide vane 29 is fitted into the guide cylindrical portion 27c of the second stage guide vane 27 using the outer peripheral protrusion 29 so as to surround the first stage impeller 26. Furthermore, the guide pin 27d of the second stage guide vane 27
The holding plate 25 is brought into contact with the second stage guide vane 27 via the guide vane 27, while the through guide 42 is brought into contact with the first stage guide vane 29. The partition wall plate 28 and the second-stage guide vane 27 are disposed so as to pass therethrough, and the passage guide 42 and the presser plate 25 are fixed with small screws 43, thereby forming a fixing portion of the impeller unit 15. The rotating part and the fixed part of the impeller unit 15 are combined together to form one impeller unit 15.

In addition, the second stage guide vane 27. The fitting between the partition plate 28 and the first stage guide vane 29 is the guide cylindrical part 27c of the second stage guide vane 27.
Although this is done through the partition wall plate 28 or the first stage guide vane 29, a guide cylindrical portion may be provided. Further, the presser plate 25 can be omitted.

When the electric motor 21 is energized and the rotating shaft 22 is rotated, the first stage impeller 30 and the second stage impeller 26 are rotated, and the frame body 3 is rotated.
Water is sucked in from the suction port 31a of the first stage impeller 3o.
The pressure is increased at the water channel 28a, and reaches the water channel 27b through the water channel 28a, where the pressure is further increased at the second stage impeller 26, thereby making it possible to pump water to a predetermined level.

According to such a multistage pump, the impeller 26.30 in the axial direction
In a multistage pump 6.7 formed by arranging a plurality of guide vanes 27.29, an impeller 26.30 is attached to a single-blade axle 37 to form a rotating part, and the guide vanes 27.29
The rotating part and the fixed part are combined to form one impeller unit 15, and the impeller shaft 37 is attached to the rotating shaft 22 of the electric fi 21. The unit 15 can be removed from the rotating shaft 22 in one operation for maintenance and inspection at a convenient location.

Furthermore, since the guide vanes 27 and 29 are connected by interposing a porous partition wall plate 28 having a water channel 28a between them, weight reduction and noise reduction can be achieved.

Further, a disk portion 37a is formed at one end of the impeller shaft 37,
The rear shroud 26a of the second-stage impeller 26 is attached to this disk portion 37a so as to be in surface contact with the second-stage impeller 26, and a spacer 44 is provided between the first-stage impeller 3o and the second-stage impeller 26. The disk portion 44a is the first stage impeller 30
Both impellers 26 are in surface contact with the rear shroud 30a, and the rotating portion including the spacer 44 is formed.
．． It is possible to suppress runout of 30.26 mm, and each impeller is 30.26 mm.
can be shared.

〔Effect of the invention〕

According to the present invention, it is possible to provide a multi-stage pump that is easy to maintain and inspect, can be lightweight and reduce noise, can suppress vibration of the impeller, and can share each impeller.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of the multistage pump of the present invention, Fig. 2 is an exploded perspective view of the multistage pump, Fig. 3 is a sectional view of an impeller unit used in the multistage pump, and Fig. 4 is a cross sectional view of the multistage pump. It is an installation explanatory diagram. 6.7... Pump, 15... Impeller unit, 21
...Electric motor, 22... Rotating shaft, 26... Second stage impeller, 27... Second stage guide vane, 28... Partition plate,
29...1st stage guide vane, 30...1st stage impeller,
31... Housing, 37... Impeller shaft, 44... Spacer. 3rd concave

Claims (1)

[Claims] 1. In a multistage pump having a plurality of impellers and guide vanes arranged in the axial direction, the impeller is attached to the impeller shaft to form a rotating part, and the guide vanes are connected. A multi-stage pump characterized in that a rotating part is formed, one impeller unit is configured by a combination of the rotating part and a fixed part, and the impeller shaft is attached to a rotating shaft of an electric motor. 2. In a multi-stage pump having a plurality of impellers and guide vanes arranged in the axial direction, the impeller is attached to the impeller shaft to form a rotating part, and a partition plate made of a porous material has a water channel between the guide vanes. A multi-stage pump characterized in that: the rotary part and the fixed part are combined to form a fixed part, the impeller shaft is attached to the rotating shaft of an electric motor. . 3. In a multistage pump having a plurality of impellers and guide vanes arranged in the axial direction, a disk portion is formed at one end of the impeller shaft, and the rear shroud of the second stage impeller comes into surface contact with this disk portion. At the same time, a spacer is provided between the first stage impeller and the second stage impeller so that the disc part of this spacer is in surface contact with the rear shroud of the first stage impeller, and the impeller shaft A rotating part is formed by both the impellers and the spacer, and a fixed part is formed by connecting the guide vanes, and a combination of the rotating part and the fixed part constitutes one impeller unit, and the guide vanes are connected together to form a fixed part. A multistage pump characterized by having an axle attached to the rotating shaft of an electric motor.