CN218467903U

CN218467903U - Centrifugal pump blade with triangular groove structure

Info

Publication number: CN218467903U
Application number: CN202222312175.9U
Authority: CN
Inventors: 冯凯凯; 冯建军; 吴广宽; 朱国俊; 李晨昊; 王李科
Original assignee: Xian University of Technology
Current assignee: Xian University of Technology
Priority date: 2022-08-31
Filing date: 2022-08-31
Publication date: 2023-02-10
Anticipated expiration: 2032-08-31

Abstract

The utility model discloses a centrifugal pump blade that possesses triangular groove structure all is provided with a plurality of evenly distributed's triangular groove structure on the pressure surface at blade tip and suction surface, and the triangular groove is the triangular pyramid shape. The depth angle of the triangular groove is 8-12 degrees, the opening angle is 50-60 degrees, and the groove length is 4-6 mm. The utility model discloses the triangular groove structure of blade can change the fluidic pressure in low-pressure area that the centrifugal pump formed when the operation, makes low-pressure area fluid pressure be higher than the air separation pressure to lead to the bubble difficult escape, the cavitation phenomenon is difficult for taking place, and then improves the life of centrifugal pump.

Description

Centrifugal pump blade with triangular groove structure

Technical Field

The utility model belongs to the technical field of fluid machinery equipment, concretely relates to centrifugal pump blade who possesses triangular groove structure.

Background

Under the conditions of high-speed flow and pressure change, cavitation-like corrosion damage occurs on the metal surface in contact with the fluid, which is called cavitation erosion.

Cavitation often occurs in the high velocity pressure relief zone at the vane end of centrifugal pumps. When the centrifugal pump works, the centrifugal force generated by the high-speed rotation of the impeller enables liquid sucked by the suction pipe to be thrown to the outlet of the impeller along the blade flow channel, and meanwhile, a low-pressure area lower than the atmospheric pressure is formed on the suction surface of the blade. When the lowest pressure of the suction surface of the blade is less than the saturated vapor pressure of the liquid to be conveyed at the temperature, the liquid starts to vaporize at the inlet of the impeller to generate bubbles, the bubbles are continuously carried away under the wrapping of the liquid, and new bubbles are continuously generated. When the bubbles are brought into the high-pressure area by the liquid, the bubbles can be quickly broken and disappear, and at the moment of breaking the bubbles, the liquid around the bubbles quickly gushes into cavities generated by breaking the bubbles, so that impact pressure is generated. When these bubbles break near the wall surface of the flow channel, the surrounding liquid will continuously hit the metal surface at a high frequency, resulting in the phenomenon of cavitation erosion of the metal surface. Therefore, the generation of bubbles is a main cause of cavitation of the blade.

Mechanical parts can be destroyed in the cavitation, can lead to the blade to destroy when serious, shortens the life of pump, also can produce a large amount of noises and vibrations, still can influence pump lift and flow for the efficiency of pump reduces.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a centrifugal pump blade that possesses triangular groove structure, the triangular groove structure that sets up on the blade has anti cavitation erosion performance, and reducible cavitation erosion increases the life of blade to centrifugal pump blade's harm to also can avoid because of unit vibration and the noise that blade cavitation erosion produced.

The utility model adopts the technical proposal that:

the centrifugal pump blade with the triangular groove structure is provided with a plurality of triangular groove structures on the suction surface of the tip end of the blade, and the triangular groove is in a triangular pyramid shape.

The utility model discloses a characteristics still lie in:

the pressure surface of the tip of the blade is provided with a plurality of triangular groove structures.

The triangular grooves are uniformly distributed on the surface of the blade.

The depth angle of the triangular groove is 8-12 degrees.

The opening angle of the triangular groove is 50-60 degrees.

The length of the triangular groove is 4 mm-6 mm.

The beneficial effects of the utility model are that: the utility model discloses centrifugal pump blade improves the cavitation erosion resistance of blade through the condition that changes liquid vaporization, promptly through setting up the triangular groove structure on centrifugal pump blade surface, has changed the fluidic pressure of low-pressure area when centrifugal pump moves, makes low-pressure area fluid pressure be higher than the air separation pressure to lead to the difficult effusion of bubble, the difficult emergence of cavitation phenomenon.

Drawings

FIG. 1 is a schematic structural view of a centrifugal pump blade according to the present invention;

FIG. 2 is a schematic structural view of a triangular groove in a centrifugal pump blade according to the present invention;

fig. 3 is a sectional view of the centrifugal pump blade according to the present invention in the extended direction.

In the figure, 1 is a blade, and 2 is a triangular groove.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

The utility model discloses the centrifugal pump blade that possesses the triangular groove structure, the structure is shown in figure 1, all is provided with a plurality of evenly distributed's triangular groove 2 structure on the pressure surface and the suction surface at 1 most advanced of blade, and triangular groove 2 is triangular pyramid.

The specific structure of the triangular groove 2 is shown in fig. 2, wherein OD is the groove length of the triangular groove 2, OA, OB, OC are the three edge lengths of the triangular groove 2, AB, BC, and AC are the three side lengths of the bottom surface, the included angle θ 1 between OD and OC is the depth angle of the triangular groove 2, and the included angle θ 2 between BC and AC is the opening angle of the triangular groove 2. The depth angle theta 1 is 8-12 degrees, the opening angle theta 2 is 50-60 degrees, and the groove length OD is 4-6 mm.

In this example, the depth angle θ 1 was 10 °, the opening angle θ 2 was 60 °, and the groove length was 5mm. Carry out 2 structure processing of triangular groove to 1 most advanced surface of centrifugal pump blade according to design size, chive out 4 triangular groove 2 structures according to design size respectively on the pressure surface and the suction surface of 1 most advanced of blade, 4 triangular groove 2 are at 1 most advanced surface evenly distributed of blade.

Fig. 3 is a sectional view of the blade of the present invention, the cross section of the triangular groove 2 is triangular, and is located at the tip of the suction surface and the pressure surface of the blade 1.

The utility model provides a centrifugal pump blade that possesses triangular groove structure, the 2 structural distributions of triangular groove are at 1 most advanced of blade, and this structure needs to be processed blade 1 in advance, chisels out the recess of triangular groove 2 structure at its most advanced, then will have blade 1 of triangular groove 2 structure and install on the impeller. When the impeller with the structure runs, the triangular groove 2 structure on the impeller can change the flow rate of fluid in a low-pressure area in the centrifugal pump, and the change of the flow rate causes the pressure change of the fluid, so that the pressure formed at the contraction section of the triangular groove 2 is higher than the air separation pressure, the liquid at the contraction section is not vaporized to generate bubbles, and the occurrence of cavitation can be effectively reduced due to the reduction of the bubbles. The lowest pressure position of the centrifugal pump is arranged at the position, close to the suction surface and the pressure surface of the blade of the front cover plate, of the inlet of the blade 1, so that the triangular groove 2 is arranged at the position, the cavitation erosion resistance of the blade of the centrifugal pump can be improved to the greatest extent, the vibration and the noise of a unit are reduced, and the overall performance of the centrifugal pump is improved.

Claims

1. The centrifugal pump blade with the triangular groove structure is characterized in that a plurality of triangular groove (2) structures are arranged on the suction surface of the tip end of the blade (1), and the triangular grooves (2) are triangular pyramids.

2. The centrifugal pump blade with the triangular groove structure according to claim 1, wherein a plurality of triangular groove structures (2) are provided on the pressure surface of the tip of the blade (1).

3. Centrifugal pump blade with triangular groove structure according to claim 1 or 2, characterized in that the triangular grooves (2) are evenly distributed on the surface of the blade (1).

4. The centrifugal pump blade having a triangular groove structure according to claim 1 or 2, wherein the depth angle of the triangular groove (2) is 8 ° to 12 °.

5. The centrifugal pump blade having a triangular groove structure according to claim 1 or 2, wherein an opening angle of the triangular groove (2) is 50 ° to 60 °.

6. The centrifugal pump blade having a triangular groove structure according to claim 1 or 2, wherein the length of the triangular groove (2) is 4mm to 6mm.