RU52615U1 - CENTRIFUGAL PUMP - Google Patents

Abstract

Technical solution centrifugal pump, relates to the field of engineering and can be used in non-displacement displacement pumps, for example, centrifugal multisection. The pump includes a stator part containing a one-piece housing 1 and / or a stacked housing of inlet and pressure caps 2, 3, sections 4, in the middle of which guide devices 5 and a rotor part, which is a shaft 6 with impellers 7, 8, 9, are located. .. and with a device 11, hydraulic unloading of axial force, made in the form of a hydraulic stain or an unloading drum, and placed outside in the tapering part of the inlet pipe 14 or outside in the expanding part of the discharge pipe 15, from the outside of one of the bearings 12, 13, located ennyh inside stator part, in which the rotor is mounted, which may be provided upstream wheel 16.

Description

The technical solution relates to the field of engineering and can be used in non-displacement displacement pumps, for example, centrifugal multisection.

Known centrifugal pump [1], containing the stator and rotor parts. The stator part consists of a one-piece and stacked housing. Typesetting housing includes sections, among which are guide devices. On the sides of the section are closed by inlet and pressure caps with inlet and outlet nozzles. The rotor part comprises a shaft on which the impellers and an unloading device are mounted. At the same time, the shaft is located in remote bearings, which are installed at a certain distance from the covers and their bodies are attached by brackets to the covers.

These pumps have a significant drawback: - bearings are removed outside the pump. This means that the bearings are at a considerable distance from each other. The dimensions of the pump are increased. The shaft bends under its own weight and the weight of the impeller with the unloading device. To eliminate the deflection, the shaft between the bearings is thickened, which entails an increase in the mass of the rotor and pump. In addition, the load on the bearings increases. Typically, remote bearings are forced lubricated by a nationwide oil system, resulting in additional costs.

Also known are pumps [2, 3, 4], which have a similar design scheme and the same drawbacks as previously described.

Known centrifugal pump [5], which also has a stator and rotor parts. One of the bearings connecting the stator and rotor parts is located in the parts located in the cover. Another bearing is remote. In such a pump, the distance between the bearings is reduced compared to the previously described pumps. However, the distance is still large and at high speeds the rotor vibrates, which negatively affects the bearing, seals and the entire pump.

In all these pumps, an axial force hydraulic unloading device is located between the set of impellers and one of the bearings. This arrangement of the device in the pump is irrational, that is, the volume of the stator part is used unsatisfactorily, especially with respect to the length of the rotor. In addition, it is difficult to access the device of hydraulic unloading of axial force during the audit of the pump.

To eliminate these shortcomings, the task was to create a centrifugal pump with the most reduced distance between the bearings, taking into account the most rational arrangement of the device of hydraulic unloading of axial force.

To solve this problem, a centrifugal pump design has been proposed, which includes, like the well-known one, a stator part containing a one-piece housing and / or a stacked housing of inlet and pressure covers, sections in the middle of which are guiding devices and a rotor part. The rotor part is a shaft with impellers and with a device of hydraulic unloading of axial force, made in the form of a hydraulic stain or an unloading drum. The rotor part is mounted in slide bearings connecting it to the stator part.

Unlike the known one, in the inventive centrifugal pump, both bearings are located inside the stator part, and the hydraulic unloading device is located on the outside of one of the bearings.

In addition, the rotor can be equipped with an upstream wheel.

Distinctive features of the proposed technical solution are glad of new qualities, which positively affects the technical result:

- both bearings are located inside the stator part. This allows you to reduce the distance between the bearings, and therefore the deflection of the shaft, which in turn leads not only to reduce the length, but also the mass of the pump;

- the hydraulic unloading device is located on the outside of one of the bearings. Using this arrangement, rational use of the cavities of the stator part of the pump is ensured. In addition, improved access to the device of hydraulic unloading axial force;

- the rotor is equipped with an upstream wheel. This prevents cavitation in front of the first impeller.

These essential features consist of a causal relationship with the results achieved and allow you to create a centrifugal pump of reduced dimensions and its mass.

This technical solution is illustrated in the drawing.

Figure 1 shows a centrifugal pump with a one-piece and one-piece housing.

Figure 2 shows a centrifugal pump with a built-in housing.

The centrifugal pump includes a stator part, comprising a one-piece housing 1 and / or a stacked housing of inlet and pressure caps 2, 3, sections 4, in the middle of which guide devices 5 and a rotor part are located. The rotor part is a shaft 6 with impellers 7, 8, 9 ... and with a device 11 of hydraulic unloading of axial force, made in the form of a hydraulic foot or an unloading drum. The rotor is mounted on bearings 12, 13 of the sliding connecting the stator and rotor parts. Both bearings 12, 13 are located inside

stator clean. The hydraulic unloading device 8 is located on the outside of one of the bearings and is located outside in the tapering part of the inlet pipe 14 or outside in the expanding part of the discharge pipe 15. In this case, the centrifugal pump rotor can be equipped with an upstream wheel 16.

The centrifugal pump operates as follows.

When the rotor rotates, the working fluid enters the impeller 7 of the first stage. Under the action of the centrifugal force created by the impeller 7, the liquid through the inter-blade space of this wheel is fed into the channels of the guide apparatus 5 and then to the impeller 8 of the second stage. Wheel 8, the second stage picks up and directs the fluid into the channels of the guide apparatus of this stage. The fluid passing through all the stages enters the discharge pipe 15.

The rotation of the rotor occurs in bearings 12, 13 of the slide, which are located at the minimum possible distance from each other. The distance is selected taking into account the number of steps and the presence of the upstream wheel 16. The axial forces are balanced by the hydraulic unloading device 11.

The efficiency of this pump and the correct installation of bearings 12, 13 and bearings 11 and the hydraulic unloading of axial forces is confirmed by tests. Tests were carried out at 3000 rpm. pump rotor. Noises and pops were absent, the supply of working fluid occurred evenly. After 56 hours of operation of the pump, the rotor part was removed and the bearings 12, 13 and bearings 11 of the hydraulic unloading of axial forces were examined. On the working surfaces of the bearings and the hydraulic unloading device (in this pump, hydrofoil), signs of wear and scoring were not found. The fit of the working surfaces of the heel is uniform over the entire plane, since the mirror of the working surface has

same color. This means that the runout of the shaft is absent, and therefore the shaft deflection between the bearings is absent.

This technical solution is new and useful, aimed at improving the design of centrifugal multisection pumps with integral and / or stacked housings and can be performed on existing domestic equipment.

The claimed technical solution is aimed at reducing energy intensity, therefore, it is relevant and promising.

Claims (2)

1. The centrifugal pump, comprising a stator part, comprising a one-piece housing and / or one-piece housing of inlet and pressure caps, sections, in the middle of which are guiding devices and a rotor part, which is a shaft with impellers and with an axial force hydraulic unloading device, made in the form of a hydraulic foot or an unloading drum installed in sliding bearings connecting the stator and rotor parts, characterized in that both bearings are located inside the stator part, and the device is hydraulically Coy discharge is the outer side of one of the bearings. 2. The centrifugal pump according to claim 1, characterized in that the rotor is equipped with an upstream wheel.