RU77367U1 - CENTRIFUGAL VERTICAL PUMP - Google Patents

Abstract

The technical solution, a vertical centrifugal pump, refers to the field of mechanical engineering and can be used in KsV type condensate pumps, contains an outer casing, with its lower and upper parts 1, 2, inlet pipe 3, outlet pipe 4, guide devices 5 are installed inside both parts, 6, 7, sections 8, 9 and they are closed with a figured cover 10, inside the indicated parts there is a rotor part including a shaft 11, an upstream wheel (not shown in Fig.), Impellers 12, 13, and axial force unloading device 14, above which, in oh lid 10, a medium pressure cavity 15 is formed, limited by the seal housing 16, a low pressure cavity 17 is formed in the lower part 1 of the housing, and a high pressure cavity 18 is formed in the upper part 2 of the housing, a channel 19 is made in the upper part of the figured cover 10 passing into the branch 20, 21, passing through the hole 23 and connecting the cavity 15 and 17.

1 p. Fs, 1 ill.

Description

Technical solution vertical centrifugal pump belongs to the field of mechanical engineering and can be used in condensate type pumps KsV.

A known centrifugal vertical pump [1], which contains the stator and rotor parts.

The stator part includes an outer casing consisting of a lower part with an inlet pipe and an upper part with an output pipe. Inside both parts, guide vanes and sections are installed. The upper part of the body is fixed with a curly cover. The latter holds the bearing housing and glass with windows. The figured lid, together with the sections, formed an inner case. Inside this housing is a rotor part consisting of a shaft, upstream and impellers, and a drum of an axial force unloading device.

In the known pump, three cavities are formed: low, high and medium pressure. The low pressure cavity is located at the bottom of the housing. The high pressure cavity is located in the upper part of the housing. The medium pressure cavity is located inside the figured cover, above the axial force unloading device. The low-pressure cavity and the high-pressure cavity, as well as the high-pressure cavity and the medium-pressure cavity are isolated from one another. In addition, the medium-pressure cavity is connected to the low-pressure cavity through a horizontal channel of the figured lid, a vertical outlet passing through the high-pressure cavity, an opening in one of

sections. The specified branch, one end is fixed in the section, and the other end is installed in a figured cover. In this case, one or both of its ends have a seal.

This design of the pump does not meet the modern requirements for pumps of continuous displacement, since during pump operation the elbow seals are eroded, resulting in reduced pump performance. In addition, the installation of a figured cover with a tap is very difficult.

To eliminate these drawbacks, the task was to create a vertical centrifugal pump with an internal channel for connecting a medium-pressure cavity to a low-pressure cavity.

To solve this problem, a vertical centrifugal pump is proposed, which, like the well-known one, includes an outer casing, with its lower and upper parts, with inlet and outlet pipes, respectively, guide devices, sections are installed inside both parts, and they are closed with a figured cover, inside of said parts, there is a rotor part including a shaft, upstream and impellers, and an axial force unloading device, moreover, above the axial force unloading device, a cavity limited to a body is formed in the figured cover ohm seal cavity is also formed in the lower and upper housing parts.

The claimed technical solution, the vertical centrifugal pump, differs from the known one in that a channel is made in the upper part of the seal housing, with its subsequent transition to a branch passing through an opening in the upper part of the figured cover, a cavity of the upper part of the housing and connected by an opening in one of the sections with cavity of the lower part of the body.

These distinguishing features are new, necessary and sufficient to achieve a positive result, namely:

- a channel is made in the upper part of the seal housing. Such a constructive solution allows you to take fluid and air bubbles from the cavity in the figured cover. Thus, blocking the movement of fluid along the channel is excluded;

- the channel goes into the tap. Retraction - the most rational technical solution, structurally simple and necessary;

- the tap passes through a hole made in the upper part of the figured cover. This allows during assembly to seal the cover with a tap;

- the tap passes through the cavity of the upper part of the housing. This is the shortest path connecting the two cavities;

- the outlet is connected with the cavity of the lower part of the housing by an opening made in one of the sections. The hole in the section is a continuation of the outlet, which allows you to drain the liquid and air from the cavity in the figured cover into the cavity with reduced pressure.

Thus, the proposed technical solution allowed the design of the outlet inside the pump housing and bring the product as a whole in line with modern requirements.

The claimed technical solution is a centrifugal vertical pump is illustrated in the drawing.

In FIG. depicted is a vertical centrifugal pump in the context.

The vertical centrifugal pump contains an outer casing, with its lower and upper parts 1, 2. In the lower part 1, there is an inlet pipe 3, and the upper part 2 has an outlet pipe 4. Inside both parts, guide devices 5, 6, 7, section 8 are installed , 9 and they are closed with a figured cover 10. Inside these parts, there is a rotor part, including a shaft 11, an upstream wheel (not shown in Fig.) And impellers 12, 13 and an axial force unloading device 14. Above the axial force unloading device 14, in the figured cover 10,

a medium pressure cavity 15 is defined, limited by the seal housing 16. A lower pressure cavity 17 is formed in the lower part 1 of the housing, and a high pressure cavity 18 is formed in the upper part 2 of the housing. In the upper part 2 of the seal housing 16, a channel 19 is made, passing further to the outlet 20, 21. The outlet 20, 21 passes through an opening 22 in the upper part of the high-pressure figured cover 10 and through the hole 23 made in section 9 connects the medium-pressure cavity 15 with a cavity 17 low pressure.

The centrifugal vertical pump operates as follows.

In the inlet pipe 3 of the pump, the working fluid. In the cavity 17, the lower part 1 of the housing, this fluid is under relatively low pressure. The fluid picked up by the upstream wheel is directed to the blades of the impeller (not shown in Fig.) Of the first stage.

Under the action of centrifugal force, the working fluid is directed into the channels formed by the guide apparatus 5 and section 8 of the first stage to the impeller 12 of the second stage. After passing the second stage, the working fluid is sent to the next stage of the pump. After passing through all the stages, the liquid enters the cavity 18 of the upper part of the housing and then, it goes into the outlet pipe 4.

Since the fluid is under high pressure in the cavity 18 of the upper part 2 of the housing, a part of this fluid passes through the axial force unloading device 14 and enters the cavity 15, with a lower pressure. In this case, the fluid passing from one cavity to another acts on the axial force unloading device, balancing the axial movement of the rotor. Further, from the filled cavity 15, the liquid with air bubbles, through the channel 19, passing into the outlet 20, 21 and through the hole 23 in the section, enters the cavity 17, low pressure. Thus, the pressure difference in these cavities 15, 17 is used.

As a result, we obtain the movement of fluid in an autonomous mode, which is vital for the functioning of all pump components in nominal mode.

This technical solution is aimed at improving not only the requirements for the manufacture of pumps, but also safety, as well as improving the appearance.

Claims (1)

A vertical centrifugal pump containing an outer casing with its lower and upper parts, with inlet and outlet nozzles, respectively, guide devices are installed inside both parts, sections are closed with a figured cover, inside these parts there is a rotor part including a shaft, upstream and impellers, and an axial force unloading device, and above the axial force unloading device, a cavity defined by a seal housing is formed in the figured cover, cavities are also formed in the lower and upper parts housing, characterized in that in the upper part of the seal housing a channel is made with its subsequent transition to a tap passing through an opening in the upper part of the figured cover, a cavity of the upper part of the housing and connected by an opening in one of the sections with a cavity of the lower part of the housing.