CN218542715U

CN218542715U - Flow guide stabilizing device for centrifugal pump

Info

Publication number: CN218542715U
Application number: CN202223014800.8U
Authority: CN
Inventors: 黄迪迪; 侯倩彤; 王永生
Original assignee: Ksb Pump Valve Technical Service Tianjin Co ltd
Current assignee: Ksb Pump Valve Technical Service Tianjin Co ltd
Priority date: 2022-11-14
Filing date: 2022-11-14
Publication date: 2023-02-28
Anticipated expiration: 2032-11-14

Abstract

The utility model belongs to the technical field of the centrifugal pump, especially, a water conservancy diversion stabilising arrangement for centrifugal pump, including the centrifugal pump body, the water inlet of centrifugal pump body is provided with the water conservancy diversion stabilising arrangement who is used for reducing the fluid velocity of flow, and wherein the fluid is before the impeller entry of the water inlet flow direction centrifugal pump body through the centrifugal pump body, through the action that the speed reduction is realized to the velocity of flow of water conservancy diversion stabilising arrangement convection current. This a water conservancy diversion stabilising arrangement for centrifugal pump, through setting up water conservancy diversion stabilising arrangement, can realize the effect of the velocity of flow deceleration to the fluid, when the fluid passes through the honeycomb duct, carry out branch, buffering through the bypath and the rivers dashpot that is the heliciform and distributes and resistance ball to the fluid, make fluidic speed reduce gradually, pressure risees gradually to improve the anti cavitation performance of centrifugal pump body, thereby avoided its impeller that does not have the speed reduction impact centrifugal pump body to cause the impeller impaired.

Description

Flow guide stabilizing device for centrifugal pump

Technical Field

The utility model relates to a centrifugal pump technical field especially relates to a water conservancy diversion stabilising arrangement for centrifugal pump.

Background

When the centrifugal pump runs, fluid at the inlet of the impeller has high speed and low pressure, and can be vaporized to generate bubbles. When the bubbles move to a high-pressure area along with the main flow, the bubbles collapse, and the shock waves generated when the bubbles collapse instantly form an impact action on the overflowing wall surface, so that the overflowing wall surface is damaged by repeated impact. When the number of bubbles is large, the flowing state of liquid in the centrifugal pump is influenced, the work doing capability of the centrifugal pump is reduced, the operation is unstable, and even the whole centrifugal pump unit generates vibration, so that the improvement of the cavitation resistance of the centrifugal pump is very important.

At present, the means for improving the cavitation resistance of the centrifugal pump mainly comprise the following steps: and (1) optimizing geometric parameters of the impeller. For example, the diameter of the inlet of the impeller is increased, the width of the inlet edge of the blade is increased, the curvature radius of the inlet part of a front cover plate of the impeller is changed, the thickness of the inlet edge of the blade is reduced, and the like; and (2) adding an inducer at the upstream of the impeller. An inducer is arranged at the upstream of the impeller of the centrifugal pump, and can pressurize fluid flowing into the impeller, so that the cavitation resistance of the centrifugal pump is improved. The arrangement of the inducer increases the axial length of the pump, needs the input of shaft power, and can cause the pump efficiency to be obviously reduced when the pump operates under a partial working condition; (3) The impeller is made of anti-cavitation materials, such as hard tool steel, tungsten carbide and the like; or the surface of the flow passage components of the pump may be treated, such as by applying a cavitation resistant metallic material or non-metallic coating, which may help protect the impeller, but may increase the manufacturing cost of the impeller.

SUMMERY OF THE UTILITY MODEL

Based on the technical problem that the above-mentioned has now, the utility model provides a water conservancy diversion stabilising arrangement for centrifugal pump.

The utility model provides a water conservancy diversion stabilising arrangement for centrifugal pump, including the centrifugal pump body, the water inlet of centrifugal pump body is provided with the water conservancy diversion stabilising arrangement who is used for reducing the fluid flow rate, and wherein the fluid is before the impeller entry of the water inlet flow direction centrifugal pump body through the centrifugal pump body, through the action that the speed reduction was realized to the velocity of flow of water conservancy diversion stabilising arrangement to the fluid.

Preferably, the diversion stabilizing device comprises a diversion pipe with a water outlet end in threaded connection with the water inlet of the centrifugal pump body, the diversion pipe comprises two branch pipes communicated with the water inlet of the centrifugal pump body and arched outwards, and the two branch pipes are arranged in a centrosymmetric manner.

Preferably, the diameter of the nozzle at the water inlet end of the draft tube is larger than that of the nozzle at the water outlet end.

Preferably, the inside of lateral conduit is provided with and is spiral helicine rivers dashpot, the inner wall connection of rivers dashpot has the edge the resistance ball that the spiral curve array of rivers dashpot distributes.

Preferably, the material of resistance ball is stainless steel or plastics.

The utility model provides a beneficial effect does:

through setting up the water conservancy diversion stabilising arrangement, can realize the effect of the velocity of flow deceleration to the fluid, when the fluid passes through the honeycomb duct, carry out branch, buffering through the water flow dashpot that the branch pipe distributes with being the heliciform and resistance ball to the fluid, make the speed of fluid reduce gradually, pressure risees gradually to improve the anti cavitation performance of centrifugal pump body, thereby avoided its impeller that does not have speed reduction impact centrifugal pump body to cause the impeller impaired.

Drawings

Fig. 1 is a schematic view of a flow guiding and stabilizing device for a centrifugal pump according to the present invention;

fig. 2 is a perspective view of a branch pipe structure of a flow guiding stabilizer for a centrifugal pump according to the present invention;

fig. 3 is a cross-sectional view of the flow guiding pipe structure of the flow guiding stabilizing device for the centrifugal pump according to the present invention.

In the figure: 1. a centrifugal pump body; 2. a flow guide pipe; 3. a pipeline is branched; 4. a water flow buffer tank; 5. a resistance ball.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Referring to fig. 1-3, a flow guiding and stabilizing device for a centrifugal pump comprises a centrifugal pump body 1, wherein a flow guiding and stabilizing device for reducing the flow velocity of a fluid is arranged at a water inlet of the centrifugal pump body 1, and the flow velocity of the fluid is reduced by the flow guiding and stabilizing device before the fluid flows to an impeller inlet of the centrifugal pump body 1 through the water inlet of the centrifugal pump body 1.

Further, in order to realize branching the fluid and achieve the effect of reducing the flow velocity of the fluid, the diversion stabilizing device comprises a diversion pipe 2 with a water outlet end connected with a water inlet thread of the centrifugal pump body 1, the diversion pipe 2 comprises two branch pipes 3 communicated with the water inlet of the centrifugal pump body 1 and arched outwards, wherein the two branch pipes 3 are arranged in a central symmetry manner, so that the fluid is branched and buffered through the branch pipes 3 when passing through the diversion pipe 2.

Furthermore, in order to make the high-flow-rate fluid flow in from the water inlet end of the flow guide pipe 2, the high-flow-rate fluid flows out from the water outlet end of the flow guide pipe 2 at a low flow rate through the flow guide pipe 2, and the diameter of the pipe orifice at the water inlet end of the flow guide pipe 2 is larger than that of the pipe orifice at the water outlet end.

Further, in order to realize exerting resistance on the fluid and achieve the effect of reducing the flow velocity of the fluid, a spiral water flow buffer groove 4 is arranged inside the branch pipeline 3, and resistance balls 5 distributed along the spiral curve array of the water flow buffer groove 4 are connected to the inner wall of the water flow buffer groove 4.

Further, the material of the resistance ball 5 is stainless steel or plastic.

Through setting up the water conservancy diversion stabilising arrangement, can realize the effect of the velocity of flow deceleration to the fluid, when fluid process honeycomb duct 2, through the small transfer line 3 with be the rivers dashpot 4 and the resistance ball 5 that the heliciform distributes branch, the buffering to the fluid, make fluidic speed reduce gradually, pressure risees gradually to improve centrifugal pump body 1's anti cavitation performance, thereby avoided its impeller that does not have speed reduction impact centrifugal pump body 1 to cause the impeller impaired.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. A water conservancy diversion stabilising arrangement for centrifugal pump includes centrifugal pump body (1), its characterized in that: the water inlet of the centrifugal pump body (1) is provided with a flow guide stabilizing device for reducing the flow velocity of fluid, wherein the flow velocity of the fluid is reduced through the flow guide stabilizing device before the fluid flows to an impeller inlet of the centrifugal pump body (1) through the water inlet of the centrifugal pump body (1).

2. The flow guide stabilizing device for a centrifugal pump according to claim 1, wherein: the flow guide stabilizing device comprises a flow guide pipe (2) with a water outlet end in threaded connection with a water inlet of the centrifugal pump body (1), the flow guide pipe (2) comprises two branch pipelines (3) which are communicated with the water inlet of the centrifugal pump body (1) and are arched outwards, and the two branch pipelines (3) are arranged in a centrosymmetric manner.

3. A flow guide stabilizing device for a centrifugal pump according to claim 2, wherein: the diameter of the water inlet end pipe orifice of the flow guide pipe (2) is larger than that of the water outlet end pipe orifice.

4. A flow guide stabilizing device for a centrifugal pump according to claim 2, wherein: the inside of a pipeline (3) is provided with and is spiral helicine rivers dashpot (4), the inner wall of rivers dashpot (4) is connected with follows resistance ball (5) that the spiral curve array of rivers dashpot (4) distributes.

5. The flow guide stabilizing device for a centrifugal pump according to claim 4, wherein: the resistance ball (5) is made of stainless steel.