Vortex prevention structure for inlet of large centrifugal pump

Abstract

The utility model relates to an anti-vortex structure for an inlet of a large centrifugal pump, which comprises an annular anti-vortex plate, the axis of the anti-vortex plate is consistent with that of the centrifugal pump, the anti-vortex plate is mounted at the inlet of the centrifugal pump and positioned at the front end of an impeller of the centrifugal pump, and a splitter plate is arranged on the peripheral wall of the anti-vortex plate. The multiple splitter plates are arranged in the circumferential direction of the vortex preventing plate at intervals, the sides, away from the vortex preventing plate, of the splitter plates are fixedly connected with connecting edges, the connecting edges are connected with all the splitter plates at the same time, and the connecting edges are fixed to the centrifugal pump through connecting assemblies. According to the technical scheme, the suction performance and operation stability of the pump can be improved, and the service life of the pump is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to centrifugal pump technical field especially is related to a prevent vortex structure for large centrifugal pump entrance. BACKGROUND

[0002] In the operation process of large centrifugal pump, due to the characteristics of fluid dynamics, and fluid when entering the pump entrance, will be affected by multiple factors, such as the shape of inlet pipe, the flow rate of fluid, liquid level height, therefore, the pump entrance is prone to vortex.

[0003] The generation of vortex can bring many adverse effects:

[0004] On the one hand, vortex can cause the suction performance of the pump to decline, increase the pump's NPSHa, thereby reducing the efficiency of the pump, and even may cause the pump's cavitation damage, shorten the service life of the pump;

[0005] On the other hand, vortex can make the flow state at the pump entrance unstable, produce vibration and noise, affect the running stability of the pump.

[0006] Therefore, it is important to design a structure that can effectively prevent vortex at the pump entrance to improve the suction performance of the pump and prolong the service life of the pump. SUMMARY

[0007] To solve the above technical problems, the application provides a prevent vortex structure for large centrifugal pump entrance.

[0008] The prevent vortex structure for large centrifugal pump entrance provided by the application adopts the following technical scheme:

[0009] A prevent vortex structure for large centrifugal pump entrance, comprising an annular anti-vortex plate, the axis of the anti-vortex plate is consistent with the axis of the centrifugal pump, the anti-vortex plate is installed at the entrance of the centrifugal pump and located at the front end of the impeller of the centrifugal pump, the outer peripheral wall of the anti-vortex plate is provided with a shunt plate, the shunt plate is spaced apart and provided with multiple pieces along the circumference of the anti-vortex plate, the side of the shunt plate away from the anti-vortex plate is fixedly connected with a connecting edge, the connecting edge is connected with all the shunt plates at the same time, and the connecting edge is fixed with the centrifugal pump through a connecting assembly.

[0010] By adopting the above technical scheme, the anti-vortex plate cooperates with the shunt plate to divide and guide the fluid entering the centrifugal pump smoothly, reduce the turbulence of the fluid, thereby effectively preventing the generation of vortex at the entrance of the centrifugal pump, improving the suction performance and running stability of the pump, and prolonging the service life of the pump.

[0011] Preferably, the connecting assembly is a fixed flange, the fixed flange comprises a flange one and a flange two, the centrifugal pump is divided into an upper section and a lower section, the upper section of the centrifugal pump extends from the top to the pump opening, the flange one is fixedly connected with the upper section, the flange two is fixedly connected with the lower section, and the flange one and the flange two are connected through a bolt pair.

[0012] The connecting edge is clamped between the flange one and the flange two, and the flange one and the flange two are provided with a stop opening for clamping the connecting edge on the side close to each other.

[0013] By adopting the above technical scheme, when the anti-vortex plate is installed, the horizontal degree and the vertical degree of the anti-vortex plate are ensured, then the flange one and the flange two are aligned, the connecting edge is clamped into the stop opening between the flange one and the flange two, and then the flange one and the flange two are fixed through the bolt pair, so that the installation is convenient.

[0014] Preferably, the anti-vortex plate and the flow distribution plate are made of stainless steel or high-strength plastic.

[0015] By adopting the above technical scheme, the anti-vortex plate and the flow distribution plate have good corrosion resistance and mechanical strength, so as to ensure the stability of the anti-vortex plate in the high-flow fluid.

[0016] Preferably, the inner circumferential wall of the anti-vortex plate is arranged in a tapered manner from the direction away from the centrifugal pump impeller to the direction close to the centrifugal pump impeller.

[0017] By adopting the above technical scheme, the guiding effect of the anti-vortex plate on the fluid is further improved, and the turbulence of the fluid is further reduced.

[0018] In summary, the present application has at least one of the following beneficial technical effects:

[0019] 1. The anti-vortex plate cooperates with the flow distribution plate to distribute the fluid entering the centrifugal pump and guide the fluid to enter the centrifugal pump smoothly, reduce the turbulence of the fluid, thereby effectively preventing the generation of vortex at the inlet of the centrifugal pump, improving the suction performance and operation stability of the pump, and prolonging the service life of the pump;

[0020] 2. When the anti-vortex plate is installed, the horizontal degree and the vertical degree of the anti-vortex plate are ensured, then the flange one and the flange two are aligned, the connecting edge is clamped into the stop opening between the flange one and the flange two, and then the flange one and the flange two are fixed through the bolt pair, so that the installation is convenient;

[0021] 3. The anti-vortex plate and the flow distribution plate have good corrosion resistance and mechanical strength, so as to ensure the stability of the anti-vortex plate in the high-flow fluid. BRIEF DESCRIPTION OF DRAWINGS

[0022] Fig. 1 is the overall structure schematic diagram of an anti-vortex structure for the inlet of a large centrifugal pump in the first embodiment of the present application.

[0023] Fig. 2 is a cross-sectional structure diagram for showing the anti-vortex structure in the embodiment one of the present application.

[0024] Fig. 3 is a cross-sectional structure diagram for showing the anti-vortex structure in the embodiment two of the present application.

[0025] The reference signs are explained as follows: 1, centrifugal pump; 11, upper section; 12, lower section; 2, impeller; 3, anti-vortex plate; 31, shunt plate; 32, connecting rim; 4, connecting assembly; 41, flange one; 42, flange two; 43, stop. DETAILED DESCRIPTION

[0026] The following will be explained in detail with reference to the accompanying drawings. Figs. 1-3 The present application is further explained in detail.

[0027] The embodiment of the present application discloses an anti-vortex structure for the inlet of a large centrifugal pump.

[0028] Embodiment one

[0029] Reference Figs. 1-2 The anti-vortex structure for the inlet of a large centrifugal pump comprises an annular anti-vortex plate 3, the axis of the anti-vortex plate 3 is consistent with the axis of the centrifugal pump 1, the anti-vortex plate 3 is installed at the inlet of the centrifugal pump 1 and located at the front end of the impeller 2 of the centrifugal pump 1, the outer peripheral wall of the anti-vortex plate 3 is fixedly connected with a shunt plate 31, the shunt plate 31 is spaced apart and arranged in multiple pieces along the circumferential direction of the anti-vortex plate 3, the side of the shunt plate 31 away from the anti-vortex plate 3 is fixedly connected with a connecting rim 32, the connecting rim 32 is connected with all the shunt plates 31 at the same time, and the connecting rim 32 is fixed with the centrifugal pump 1 through a connecting assembly 4.

[0030] The anti-vortex plate 3 and the shunt plate 31 are made of stainless steel or high-strength plastic, in this embodiment, stainless steel is adopted, so that the anti-vortex plate 3 and the shunt plate 31 have good corrosion resistance and mechanical strength, so as to ensure the stability of the anti-vortex plate 3 in the high flow rate fluid.

[0031] The number of the shunt plates 31 is set according to the flow rate of the centrifugal pump 1 and the pipe diameter at the inlet of the centrifugal pump 1, and the number of the shunt plates 31 is usually 6-12 pieces, and in this embodiment, 8 pieces are set.

[0032] The anti-vortex plate 3 cooperates with the shunt plate 31 to be able to shunt the fluid entering the centrifugal pump 1 and guide the fluid to enter the centrifugal pump 1 stably, reduce the turbulence of the fluid, thereby effectively preventing the generation of vortex at the inlet of the centrifugal pump 1, improving the suction performance and running stability of the pump, and prolonging the service life of the pump.

[0033] The connecting assembly 4 is a fixed flange, which comprises a flange one 41 and a flange two 42. The centrifugal pump 1 is divided into an upper section 11 and a lower section 12. The upper section 11 of the centrifugal pump 1 extends from the top to the pump opening. The flange one 41 is fixedly connected with the upper section 11, and the flange two 42 is fixedly connected with the lower section 12. The flange one 41 and the flange two 42 are connected through a bolt pair.

[0034] The connecting edge 32 is clamped between the flange one 41 and the flange two 42. The flange one 41 and the flange two 42 are provided with a stop 43 for clamping the connecting edge 32 on the side close to each other.

[0035] When the anti-vortex plate 3 is installed, the horizontal and vertical degrees of the anti-vortex plate 3 are ensured, then the flange one 41 and the flange two 42 are aligned, the connecting edge 32 is clamped into the stop 43 between the flange one 41 and the flange two 42, and then the flange one 41 and the flange two 42 are fixed through the bolt pair. The installation is convenient.

[0036] Embodiment two

[0037] Reference Fig. 3 The difference between embodiment two and embodiment one is that the inner circumferential wall of the anti-vortex plate 3 is tapered from the direction away from the impeller 2 of the centrifugal pump 1 to the direction close to the impeller 2 of the centrifugal pump 1. The guiding effect of the anti-vortex plate 3 on the fluid is further improved, and the turbulent flow of the fluid is further reduced.

[0038] The above are the preferred embodiments of the present application, which do not limit the protection scope of the present application. Any equivalent changes made on the basis of the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A vortex prevention structure for use at the inlet of a large centrifugal pump, characterized by: The application relates to a centrifugal pump (1) comprising a ring-shaped anti-vortex plate (3) whose axis is consistent with the axis of the centrifugal pump (1), the anti-vortex plate (3) is installed at the inlet of the centrifugal pump (1) and located at the front end of an impeller (2) of the centrifugal pump (1), a shunt plate (31) is arranged on the outer peripheral wall of the anti-vortex plate (3), a plurality of shunt plates (31) are arranged at intervals along the circumference of the anti-vortex plate (3), a connecting edge (32) is fixedly connected to the side of the shunt plate (31) away from the anti-vortex plate (3), the connecting edge (32) is connected with all the shunt plates (31) at the same time, and the connecting edge (32) is fixed to the centrifugal pump (1) through a connecting assembly (4).

2. A vortex breaker structure for use at the inlet of a large centrifugal pump according to claim 1, characterized in that: The connecting assembly (4) is a fixed flange, the fixed flange comprises a flange one (41) and a flange two (42), the centrifugal pump (1) is divided into an upper section (11) and a lower section (12), the upper section (11) of the centrifugal pump (1) extends from the top to the pump opening, the flange one (41) is fixedly connected with the upper section (11), the flange two (42) is fixedly connected with the lower section (12), and the flange one (41) and the flange two (42) are connected through a bolt pair. The connecting edge (32) is clamped between the flange one (41) and the flange two (42), one side of the flange one (41) and the flange two (42) is provided with a stop opening (43) for clamping the connecting edge (32).

3. The anti-swirl structure for use in large centrifugal pump inlets of claim 1, wherein: The anti-vortex plate (3) and the shunt plate (31) are made of stainless steel or high-strength plastic.

4. The anti-swirl structure for use in large centrifugal pump inlets of claim 1, wherein: The inner peripheral wall of the anti-vortex plate (3) is gradually tapered from the direction away from the impeller (2) to the direction close to the impeller (2).

Images