CN219472413U - Centrifugal pump volute structure capable of reducing dynamic and static interference - Google Patents

Abstract

The utility model relates to a centrifugal pump volute structure capable of reducing dynamic and static interference, which comprises a volute spiral line segment and a volute diffusion segment, wherein the volute spiral line segment and the volute diffusion segment are connected into a whole to form the volute structure, the volute spiral line segment is provided with an arc hollow cavity for accommodating an external impeller, the volute diffusion segment is provided with a volute outlet, the volute outlet is communicated with the arc hollow cavity, the inner side surface of the volute spiral line segment is provided with a volute runner, the volute outlet is communicated with the volute runner, and a tongue isolation segment is arranged in the volute runner at the volute outlet. Compared with the traditional centrifugal pump structure, the hydraulic noise generated by the pump can be reduced, the vibration of the pump body is reduced, and particularly, when the pump operates in a large-flow area, the advantage is more remarkable, and if the centrifugal pump is applied to centrifugal pump production, the service life of a product can be prolonged.

Description

Centrifugal pump volute structure capable of reducing dynamic and static interference

Technical Field

The present utility model relates to a pump casing structure, and more particularly, to a volute casing structure of a centrifugal pump.

Background

Centrifugal pumps are increasingly used as an important fluid transport machine in the fields of chemical industry, petroleum, electric power, metallurgy, coal, aerospace and the like. The power consumption of the pump is statistically about 15% of the total power generation in the country. The stability of the centrifugal pump operation has important significance for the whole working system. However, in the working process of the centrifugal pump, the flow of the fluid in the centrifugal pump is complex, and the pulsation induced vibration and noise of the fluid seriously affect the equipment and the surrounding environment, so that the stable operation of the centrifugal pump is seriously affected.

Noise and vibration in the centrifugal pump are mainly caused by dynamic and static interference of the volute and the impeller, and particularly, a volute tongue is a very important factor affecting pressure pulsation and radial force of a flow field in the centrifugal pump. The traditional design generally only considers modes such as changing impeller external diameter or spiral case base circle diameter to improve the flow condition of inside fluid, but the effect is not ideal, and changing impeller external diameter and spiral case base circle diameter simultaneously tends to change the volume of whole pump shell by a wide margin, and the degree of difficulty of installation setting in the fluid pipeline can also be greatly increased when the effect is not ideal, increasing the whole volume of the device.

Disclosure of Invention

In order to solve the technical problems, the utility model aims to provide a centrifugal pump volute structure for reducing dynamic and static interference between impellers and a volute in the running process of the centrifugal pump, so that the centrifugal pump volute structure can run more stably.

Preferably, a transition section is arranged between the spiral line section of the spiral case and the diffusion section of the spiral case, the transition section is provided with a transition cavity communicated with the outlet of the spiral case and the flow passage of the spiral case, and the tongue separation section is positioned at the communication position between the flow passage of the spiral case and the transition cavity.

Preferably, the tongue-separating section comprises a plurality of curved-surface tongues which are arranged at intervals, and an interference groove is formed between two adjacent curved-surface tongues.

Preferably, each interference slot is a rectangular slot or a trapezoidal slot.

Preferably, the end of each curved partition tongue is provided with an arc surface.

Preferably, the spiral line section of the spiral case and the diffusion section of the spiral case are integrally formed, and the outer surfaces of the spiral line section of the spiral case and the diffusion section of the spiral case are provided with arc transition profile surfaces.

By means of the scheme, the utility model has at least the following advantages:

the technical scheme of the application is that a tongue separation section is arranged at the outlet of the volute in the volute runner. Therefore, in the centrifugal pump under the stable operation condition, in the relative motion process of the impeller blades and the volute, uneven flow fields are generated at the tongue-separating section due to wake effects, and meanwhile, the impeller blades can generate regular and periodic blade grid interference under the action of pressure load.

The partition tongue section also comprises a plurality of curved partition tongues which are arranged at intervals, and an interference groove is formed between every two adjacent curved partition tongues, so that the flow field at the partition tongue can be optimized, the dynamic and static interference effect is reduced, and the running stability of the centrifugal pump is improved.

The foregoing description is only an overview of the present utility model, and is intended to provide a better understanding of the present utility model, as it is embodied in the following description, with reference to the preferred embodiments of the present utility model and the accompanying drawings.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate a certain embodiment of the present utility model and therefore should not be considered as limiting the scope, and that other related drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic perspective view of a centrifugal pump volute structure for reducing dynamic and static interference;

FIG. 2 is a schematic perspective view of a centrifugal pump volute structure for reducing dynamic and static interference;

FIG. 3 is a schematic perspective view of a centrifugal pump volute structure for reducing dynamic and static interference in accordance with the present utility model;

fig. 4 is a schematic view of the structure of the tongue segment 6 of the present utility model.

In the figure: the spiral shell spiral line segment 1, the spiral shell diffusion section 2, the circular arc hollow cavity 3, the spiral shell outlet 4, the spiral shell runner 5, the partition tongue section 6, the transition section 7, the transition cavity 8, the curved partition tongue 9, the interference groove 10 and the circular arc surface 11.

Detailed Description

The following describes in further detail the embodiments of the present utility model with reference to the drawings and examples. The following examples are illustrative of the utility model and are not intended to limit the scope of the utility model.

Referring to fig. 1 to 4, a centrifugal pump volute structure for reducing dynamic and static interference according to a preferred embodiment of the present utility model includes a volute spiral segment 1 and a volute diffuser 2, where the volute spiral segment 1 and the volute diffuser 2 are connected into a whole to form a volute structure, the volute spiral segment 1 has a circular arc hollow cavity 3 for accommodating an external impeller, the volute diffuser 2 has a volute outlet 4, the volute outlet 4 is communicated with the circular arc hollow cavity 3, a volute flow channel 5 is opened on an inner side surface of the volute spiral segment 1, the volute outlet 4 is communicated with the volute flow channel 5, and a tongue isolation segment 6 is disposed in the volute flow channel 5 at the position of the volute outlet 4.

Preferably, a transition section 7 is arranged between the spiral line section 1 and the spiral diffusion section 2, the transition section 7 is provided with a transition cavity 8 communicated with the spiral outlet 4 and the spiral flow passage 5, and the tongue separation section 6 is positioned at the communication position between the spiral flow passage 5 and the transition cavity 8.

Preferably, the tongue-separating section 6 comprises a plurality of curved-surface tongues 9 which are arranged at intervals, and the tongue-separating section 6 is positioned between two adjacent curved-surface tongues 9 and provided with an interference groove 10.

Preferably, each interference slot 10 is a rectangular slot or a trapezoidal slot.

Preferably, the end of each curved partition tongue 9 has an arc surface 11. The circular arc surface 11 can make the travel of the fluid more smooth when passing.

Preferably, the spiral line section 1 and the spiral diffusion section 2 are integrally formed, and the outer surfaces of the spiral line section 1 and the spiral diffusion section 2 are provided with arc transition profile surfaces.

The working principle of the utility model is as follows:

the dynamic and static interference of the centrifugal pump can be reduced, so that flow noise and vibration are reduced, the centrifugal pump is stable to operate, and the causes of the dynamic and static interference of the centrifugal pump can be summarized into two types: the first is that dynamic and static interference is mainly caused by the interaction between the impeller and the stationary volute, regardless of the viscosity of the fluid. The second type is that under the action of considering the viscosity of the fluid, the main reason for the dynamic and static interference of the centrifugal pump is the convection action of the moving fluid and the fluid staying in the volute. The tongue isolation section 6 comprises a plurality of curved surface tongue isolation 9 which are arranged at intervals, the structure that the tongue isolation section 6 is provided with the interference groove 10 between two adjacent curved surface tongue isolation 9 can enable fluid staying above the tongue isolation to flow back from the through groove, reduce the fluid staying in the flow passage, lighten the convection effect of the fluid staying in the flow passage and the discharged liquid in the diffusion pipe, and finally reduce the dynamic and static interference of the centrifugal pump, thereby ensuring the stable operation of the centrifugal pump and reducing the vibration and noise during working.

When the technical scheme is used, the impeller can be arranged in the circular arc hollow cavity 3 of the spiral section 1 of the spiral casing through the rotating shaft, when the impeller rotates, fluid can flow out from the spiral casing outlet 4 through the transition cavity 8 through the spiral casing flow channel 5, and partial fluid can pass through the spiral casing outlet when flowing back to the tongue separation section 6, so that collision with the tongue separation section 6 is avoided, and the flow field structure is optimized, noise and vibration are reduced.

The last points to be described are: first, in the description of the present application, it should be noted that, unless otherwise specified and defined, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be mechanical or electrical, or may be a direct connection between two elements, and "upper," "lower," "left," "right," etc. are merely used to indicate relative positional relationships, which may be changed when the absolute position of the object being described is changed;

secondly: in the drawings of the disclosed embodiments, only the structures related to the embodiments of the present disclosure are referred to, other structures can refer to the common design, and the same embodiment and different embodiments of the present disclosure can be combined with each other under the condition of no conflict;

finally: the above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, and it should be noted that it is possible for those skilled in the art to make several improvements and modifications without departing from the technical principle of the present utility model, and these improvements and modifications should also be regarded as the protection scope of the present utility model.

Claims (5)

1. Reduce sound interference centrifugal pump spiral case structure, its characterized in that: the spiral shell comprises a spiral shell spiral line segment (1) and a spiral shell diffusion section (2), wherein the spiral shell spiral line segment (1) and the spiral shell diffusion section (2) are connected into a whole to form a spiral shell structure, the spiral shell spiral line segment (1) is provided with an arc hollow cavity (3) for accommodating an external impeller, the spiral shell diffusion section (2) is provided with a spiral shell outlet (4), the spiral shell outlet (4) is communicated with the arc hollow cavity (3), the inner side surface of the spiral shell spiral line segment (1) is provided with a spiral shell runner (5), the spiral shell outlet (4) is communicated with the spiral shell runner (5), and a tongue isolation section (6) is arranged at the spiral shell outlet (4) in the spiral shell runner (5);

a transition section (7) is arranged between the spiral line section (1) of the spiral casing and the diffusion section (2) of the spiral casing, the transition section (7) is provided with a transition cavity (8) communicated with the spiral casing outlet (4) and the spiral casing flow passage (5), and the tongue separation section (6) is positioned at the communication position between the spiral casing flow passage (5) and the transition cavity (8).

2. The centrifugal pump volute structure for reducing dynamic and static interference according to claim 1, wherein: the tongue isolation section (6) comprises a plurality of curved surface tongue isolation sections (9) which are arranged at intervals, and an interference groove (10) is formed between every two adjacent curved surface tongue isolation sections (9) of the tongue isolation section (6).

3. The centrifugal pump volute structure for reducing dynamic and static interference according to claim 2, wherein: each interference groove (10) is a rectangular groove or a trapezoid groove.

4. The centrifugal pump volute structure for reducing dynamic and static interference according to claim 2, wherein: the end part of each curved surface partition tongue (9) is provided with an arc surface (11).

5. The centrifugal pump volute structure for reducing dynamic and static interference according to claim 1, wherein: the spiral casing line segment (1) and the spiral casing diffusion section (2) are integrally formed, and the outer surfaces of the spiral casing spiral line segment (1) and the spiral casing diffusion section (2) are provided with arc transition profile surfaces.