RU68610U1 - CENTRIFUGAL PUMP - Google Patents

Abstract

The centrifugal pump belongs to the field of mechanical engineering and can be used in the design and manufacture of pumps for pumping oil products, consists of a housing 1, from the ends of which an inlet cover 2 with an inlet pipe 3 and an outlet cover 4 with a discharge pipe 5 and a rotor part having a shaft 6 are installed with upstream wheel 7 and impeller (s) 8, all parts are interconnected by bearings (not shown in Fig.), seals 9 and device 10, axial force unloading, located on the side of the medium to the axis 11 of the discharge pipe 5, the inner back of the outlet cover 4, is located after the axis 11 of the discharge pipe 5, the stator part of the device 10, the axial force unloading, is connected with the inner rear of the output cover 4 by an annular partition 12. 1 n.p. f-ly, 1 ill.

Description

The centrifugal pump belongs to the field of mechanical engineering and can be used in the design and manufacture of pumps for pumping petroleum products.

Known pump [1], which includes the stator and rotor parts. The stator part consists of inlet and outlet covers, between which sections are located and the covers and sections are pulled together with studs. Inside sections, guide vanes are installed.

The rotor part includes a shaft with impellers. The stator and rotor parts are connected by bearings, stuffing box seals and axial force unloading device.

Also known is a pump [2], which has a structure similar to that previously described.

In all these pumps, the axial force unloading device is located outside the outlet cover on the other side of the axis of the discharge pipe relative to the movement of the flow of the pumped working fluid.

With this arrangement of the pump, the material part of the cap is irrationally used. This lengthens the shaft. The distance between the thrust bearings increases, which means that the shaft deflection increases.

To eliminate these drawbacks, the task was to create a centrifugal pump of improved design by rearranging the output cover and the axial force unloading device.

To solve this problem, a centrifugal pump is proposed, including a stator part containing a housing, from the ends of which an inlet cover with an inlet pipe and an outlet cover with

a pressure pipe and a rotor part having a shaft with upstream and impellers and the parts are interconnected by bearings, seals and an axial force unloading device.

Unlike the known one, in the inventive pump, the axial force unloading device is located on the side of the working medium movement to the axis of the discharge pipe, while the stator part of the axial force unloading device is connected to the inner rear part of the output cover by an annular partition.

Distinctive features of the inventive centrifugal pump have a number of positive properties that affect the technical result, namely:

- the axial force unloading device is located on the side of the movement of the working medium to the axis of the discharge pipe. This makes it possible to more rationally use the inside of the cover, and reduces the length of the shaft, and hence the dimensions of the pump;

- the stator part of the axial force unloading device is connected to the inner rear part of the output cover by an annular partition. The annular septum between the stator part of the axial force unloading device and the inner back of the lid created a cavity that provided for the separation of the pumped liquid into two flows: the fluid flow going to the pump outlet and the fluid flow that flows from the axial force unloading device. This fluid flow is under slight pressure and is directed to the lubrication and cooling of the mechanical seal. An annular partition, blocked the access of the pumped fluid with high pressure to the mechanical seal;

Distinctive features are in a causal relationship with the result and allow to create a centrifugal pump at a high technical level, in which a cavity is formed in the cover of the discharge pipe. On one side of the cavity there is an axial force unloading device, and on the other hand, the back of the cover.

Moreover, the stator part of the discharge device is connected by an annular partition to the rear of the lid. This made it possible to connect two stationary parts, which is structurally necessary to prevent one fluid flow from entering another.

Thus, the task was solved to create an improved design pump, namely, a compact arrangement of the axial force unloading device in the cover and providing cooling and lubrication of the mechanical seal.

The essence of the technical solution is illustrated by the drawing.

A centrifugal pump, comprising a housing 1, from the ends of which an inlet cover 2 with an inlet pipe 3 and an outlet cover 4 with a discharge pipe 5 and a rotor part having a shaft 6 with an upstream wheel 7 and impellers 8 are installed. All parts are interconnected by bearings (on FIG. frequent l device 10, the axial force unloading is connected with the inner rear part of the output cover 4 by an annular partition 12.

The centrifugal pump operates as follows.

From the inlet pipe 3, the pumped liquid enters the upstream wheel 7 and then to the impellers 8. In the last stage of the impeller, the liquid under pressure is directed to the discharge pipe 5 of the outlet cover 4. A part of the working fluid passes through the axial force unloading device 10 into a closed cavity, limited the annular partition 12, and further, through the annular gap to the mechanical seals 9.

With this arrangement, the pump showed stable operation within the working area, without vibration and incidental noise.

This technical solution is aimed at improving the design of the inventive centrifugal pump type "NDMs". At the same time, dimensions and weight are reduced, the kinematics of the rotor part is improved.

The centrifugal pump type “NDMs” can be widely used in the oil and petrochemical industries, for pumping both viscous and fluid products.

The manufacture of the claimed pump is carried out on standard equipment, standard tools, with widespread use of standardized units and parts.

Claims (1)

A centrifugal pump, comprising a stator part, comprising a housing, from the ends of which an inlet cover with an inlet pipe and an outlet cover with a discharge pipe are installed, and a rotor part having a shaft with upstream and impellers and the parts are interconnected by bearings, seals and an axial force unloading device characterized in that the axial force unloading device is located on the side of the working medium to the axis of the discharge pipe, while the stator part of the axial force unloading device is connected to the internal her part off the lid ring wall.