RU2263229C2 - Centrifugal pump with double-entry impeller - Google Patents

Abstract

FIELD: mechanical engineering; pumps.

SUBSTANCE: proposed pump consists of stator with solid housing, inlet branch pipe, pressure branch pipe and guide-vane assembly with vane secured on housing, pressure chamber and chamber at impeller entry interconnected by channels made in vanes of guide-vane assembly. Pump rotor has double-entry impeller and bearings, one of which is of supports-thrust type. Rotor is installed for rotation on bearings fitted in stator. Inlet branch pipe is connected only with one of chambers at impeller entry. Second chamber at impeller entry is provided with inlet branch pipe passing through pressure chamber, being hermetically sealed in said chamber, axis of inlet branch pipe is displaced relative to axis of pressure branch pipe at angle α of within α=180° in direction of rotation of impeller.

EFFECT: improved manufacturability, mass and dimensional characteristics of pump at preservation of economy parameters.

3 dwg

Description

The present invention relates to pump engineering, and in particular to designs of centrifugal pumps with an impeller of a two-way inlet.

A well-known centrifugal pump (″ Dynamic Pumps ″, Atlas, V.V. Malyushenko, M., ″ Mechanical Engineering ’, 1984, p. 64, Fig. 106), consisting of a stator containing an integral body, inlet and pressure pipes, a guiding device with blades mounted on the housing, a chamber at the outlet of the impeller (pressure chamber), through which liquid passes from the guide apparatus to the discharge pipe, chambers at the inlets of the impeller, connected by channels with each other and with the inlet of the rotor with the impeller of the two-way entrance and bearings placed a stator, one of which is support-resistant, the rotor being rotatably mounted on bearings and passages are formed in the pump housing.

The disadvantage of this pump is the large mass of the casing, its low manufacturability and the complexity of the assembly of the entire pump.

Closest to the invented invention is a centrifugal pump with an impeller of a two-way inlet (certificate of the Russian Federation for utility model No. 30879), consisting of a stator containing an integral housing, inlet and discharge nozzles, a guiding apparatus with vanes mounted on the housing, a pressure chamber, and cameras on the entrance to the impeller, interconnected by channels made in the blades of the guide apparatus, the rotor with the impeller of the bilateral entrance, and bearings, one of which is supporting-thrust, and the rotor is installed rotatably on bearings placed in the stator and the inlet associated with only one of the chambers at the inlet of the impeller.

The disadvantage of such a pump is that, at high fluid flow rates, in order to increase the cross-sectional area of the channels, the radial size of the guide apparatus is necessary to reduce the hydraulic losses when the fluid is bypassed between the inlet chambers through the channels in the blades of the guide vane, which leads to a deterioration in the overall dimensions of the pump.

The technical result of the invention is to improve manufacturability, improve the overall dimensions of the pump while maintaining economy parameters.

The technical result is achieved by the fact that in a centrifugal pump with an impeller of a two-way inlet, consisting of a stator containing an integral body, an inlet and a pressure pipe, a guiding device with vanes, mounted on the body, a pressure chamber and chambers at the entrance to the impeller, interconnected channels made in the blades of the guide apparatus, the rotor with the impeller of the two-sided entrance, and bearings, one of which is supporting-thrust, and the rotor is mounted for rotation on bearings data in the stator, and the inlet pipe is connected only to one of the chambers at the entrance to the impeller, according to the invention, the second of the chambers at the entrance to the impeller is equipped with an inlet pipe that passes tightly through the pressure chamber, and the axis of the inlet pipe is offset relative to the axis of the pressure pipe at any angle α ranging from α = arcsin (D _out / D _n ) + arcsin (D _in / D _n ),

where D _o - the diameter of the outlet pipe in conjunction with the pressure chamber,

D _I - the diameter of the inlet pipe in conjunction with the pressure chamber,

D _n - the outer diameter of the pressure chamber,

up to α = 180 ° in the direction of rotation of the impeller.

The invention is illustrated further by the example of its use, illustrated in figures 1, 2 and 3, where

1 - housing

2 - inlet pipe

3 - inlet pipe

4 - pressure pipe

5 - guiding apparatus,

6 - blade

7 - pressure chamber

8 - camera

9 - camera

10 - the impeller of the bilateral entrance,

11 - rotor

12 - pillow block bearing

13 - thrust bearing,

14 - channel.

The pump stator contains a housing 1, inlet 2 and 3 and a pressure head 4 nozzles and a guide apparatus 5 with blades 6 fixedly mounted on the housing 1, a pressure chamber 7, chambers 8 and 9 at the entrance to the impeller 10, mounted on the rotor 11. Rotor 11 mounted rotatably on the thrust bearing 12 and the thrust bearing 13 located in the stator. In the blades 6 of the guide apparatus 5, channels 14 are made, hydraulically interconnecting chambers 8 and 9 at the entrances to the impeller and equalizing pressures in these chambers. The inlet pipe 3 passes tightly through the pressure chamber 7, and the axis of the inlet pipe 3 is offset relative to the axis of the pressure pipe 4 at an angle α of not more than 180 ° in the direction of rotation of the impeller.

The pump operates as follows. When the rotor 11 rotates, the liquid from the inlet pipes 2 and 3 enters the chambers 8 and 9, into the impeller 10 and through the guide device 5 into the pressure chamber 7 to the pressure pipe 4. When the pump is working through the channels 14 in the blades 6 of the guide apparatus 5, the alignment pressure in the chambers 8 and 9 at the entrance to the impeller 10. The required area of the passage section of the channels is quite small, which makes it possible to simplify the manufacture of the guide apparatus 5 and reduce its dimensions and weight. Introduction to the design of the pump additional inlet pipe 3 allows you to reduce the diameter and size of the inlet pipes in comparison with the prototype. The inlet pipe 3 intersects the pressure chamber 7 in the region of the zone of low fluid velocities, and the axis of the inlet pipe is displaced relative to the axis of the pressure pipe at any angle α ranging from α = arcsin (D _out / D _n ) + arcsin (D _in / D _n ),

where D _o - the diameter of the outlet pipe in conjunction with the pressure chamber,

D _I - the diameter of the inlet pipe in conjunction with the pressure chamber,

D _n - the outer diameter of the pressure chamber,

up to α = 180 ° in the direction of rotation of the impeller, and the lower limit α is selected from the condition of non-intersection of the inlet and outlet pipes.

In this range, the effect of reducing the size of the pressure chamber due to its intersection by the inlet pipe 3 on the amount of hydraulic losses in the pressure chamber, and, therefore, on the efficiency of the pump, is practically eliminated.

Thus, thanks to a new constructive solution in the claimed invention, an increase in manufacturability of manufacture, an improvement in weight and dimensions, while maintaining the economy parameters characteristic of the prototype.

Claims (1)

A centrifugal pump with an impeller of a two-way inlet, consisting of a stator containing an integral housing, an inlet and a discharge pipe, a guide vane with blades mounted on the casing, a pressure chamber and chambers at the entrance to the impeller, interconnected by channels made in the vanes of the guide vane , a rotor with an impeller of a two-sided input and bearings, one of which is support-thrust, and the rotor is mounted for rotation on bearings placed in the stator, and the inlet pipe is connected only o with one of the chambers at the entrance to the impeller, characterized in that the second of the chambers at the entrance to the impeller is equipped with an inlet pipe passing tightly through the pressure chamber, and the axis of the inlet pipe is displaced relative to the axis of the pressure pipe at an angle α ranging from α = arcsin (D _out / D _n ) + arcsin (D _in / D _n ), where D _o - the diameter of the outlet pipe in conjunction with the pressure chamber, D _I - the diameter of the inlet pipe in conjunction with the pressure chamber, D _n - the outer diameter of the pressure chamber, up to α = 180 ° in the direction of rotation of the impeller.

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