阅读说明：本技术 一种新型降低水泵汽蚀的叶轮室结构 (Novel reduce impeller chamber structure of water pump cavitation ) 是由 吴永旭 何兆川 于 2019-12-13 设计创作，主要内容包括：一种新型降低水泵汽蚀的叶轮室结构,包括叶轮室,叶轮室内设置有转动的叶轮,所述叶轮室内壁上开设有弧形槽；所述弧形槽内嵌入连接有通气环；所述叶轮室的侧壁上设置有进气口,进气口与通气环连通；所述通气环位于叶轮下方30～100mm处,通气环上开设有若干通气孔,通气孔朝向叶轮外缘与叶轮室所形成的间隙方向。与现有技术相比,本发明的一种新型降低水泵汽蚀的叶轮室结构,一方面外界有压气进入叶轮外缘与叶轮室之间的间隙处,提升此处的压力,形成高压带,让此位置压力始终高于汽化压力,避免产生气泡及后续的汽蚀情况；另外一方面因叶轮室与叶轮之间有一定的压力空气,可形成一定的气阻,减少部分液体回流,进而提升泵的效率。(A novel impeller chamber structure for reducing cavitation of a water pump comprises an impeller chamber, wherein a rotating impeller is arranged in the impeller chamber, and an arc-shaped groove is formed in the inner wall of the impeller chamber; a ventilation ring is embedded and connected in the arc-shaped groove; the side wall of the impeller chamber is provided with an air inlet which is communicated with the ventilation ring; the ventilation ring is located 30-100 mm below the impeller, a plurality of ventilation holes are formed in the ventilation ring, and the ventilation holes face to the direction of a gap formed between the outer edge of the impeller and the impeller chamber. Compared with the prior art, the novel impeller chamber structure for reducing the cavitation of the water pump has the advantages that on one hand, external pressure air enters the gap between the outer edge of the impeller and the impeller chamber, the pressure at the position is increased to form a high-pressure zone, the pressure at the position is always higher than the vaporization pressure, and the conditions of bubble generation and subsequent cavitation are avoided; on the other hand, certain air resistance can be formed due to certain pressure air between the impeller chamber and the impeller, partial liquid backflow is reduced, and the efficiency of the pump is improved.)

1. The utility model provides a novel reduce impeller chamber structure of water pump cavitation, includes the impeller chamber, is provided with the pivoted impeller in the impeller chamber, its characterized in that: an arc-shaped groove is formed in the inner wall of the impeller chamber; a ventilation ring is embedded and connected in the arc-shaped groove; the side wall of the impeller chamber is provided with an air inlet which is communicated with the ventilation ring; the ventilation ring is located 30-100 mm below the impeller, a plurality of ventilation holes are formed in the ventilation ring, and the ventilation holes face to the direction of a gap formed between the outer edge of the impeller and the impeller chamber.

2. The novel impeller chamber structure for reducing water pump cavitation as claimed in claim 1, wherein: the diameter of the ventilation ring is 15-30 mm.

3. The novel impeller chamber structure for reducing water pump cavitation as claimed in claim 1, wherein: the number of the vent holes is 15-30, and the diameter of each vent hole is 2-5 mm.

Technical Field

The invention relates to the technical field of pumps, in particular to a novel impeller chamber structure for reducing cavitation of a water pump.

Background

The pressure when the liquid is vaporized is the vaporization pressure (saturated vapor pressure) of the liquid, and when the pressure is reduced to the vaporization pressure at a certain temperature, the liquid generates bubbles filled with gas, which is the root cause of cavitation; taking an axial flow pump as an example, the cavitation phenomenon is easy to occur in the traditional structure, and in order to solve the cavitation problem, two common treatment methods are adopted:

firstly, the submerging depth is increased, the pressure between an impeller chamber and the outer edge of a blade is favorably improved, the cavitation harm is reduced, and the defects of increasing the engineering quantity and the cost are overcome;

secondly, the anti-cavitation capability of the whole pump is improved through material treatment, if the impeller chamber can adopt 304 stainless steel, the anti-cavitation capability of the pump is enhanced, and the material treatment of the impeller chamber generally comprises the following 3 treatments: 1. the whole impeller chamber is made of 304 stainless steel or other high-cavitation-resistance materials, and has the defect of high cost; 2. the stainless steel is built up in the impeller chamber, the disadvantage is that the built-up welding amount is large, the welding deformation is large, the cast steel and the stainless steel are easy to generate the welding defects such as desoldering, bulging and the like, the manufacturing period is longer, and the pump is generally suitable for pumps with the caliber below 2000 mm; 3. the impeller chamber is made of lining welded stainless steel, and has the disadvantages of complex welding process, easy intergranular corrosion at the transition part of cast steel and stainless steel and long manufacturing period.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a novel impeller chamber structure for reducing cavitation of a water pump aiming at the defects of the prior art.

In order to solve the technical problems, the invention adopts the technical scheme that:

a novel impeller chamber structure for reducing cavitation of a water pump comprises an impeller chamber, wherein a rotating impeller is arranged in the impeller chamber, and an arc-shaped groove is formed in the inner wall of the impeller chamber; a ventilation ring is embedded and connected in the arc-shaped groove; the side wall of the impeller chamber is provided with an air inlet which is communicated with the ventilation ring; the ventilation ring is located 30-100 mm below the impeller, a plurality of ventilation holes are formed in the ventilation ring, and the ventilation holes face to the direction of a gap formed between the outer edge of the impeller and the impeller chamber.

Furthermore, the diameter of the ventilation ring is 15-30 mm.

Furthermore, the number of the vent holes is 15-30, and the diameter of each vent hole is 2-5 mm.

Compared with the prior art, the novel impeller chamber structure for reducing the cavitation of the water pump has the advantages that during the operation of the pump, on one hand, outside pressurized air enters the gap between the outer edge of the impeller and the impeller chamber to increase the pressure at the gap to form a high-pressure belt, so that the pressure at the position is always higher than the vaporization pressure, the generation of bubbles and the subsequent cavitation condition are avoided, the submerging depth of a large-scale pump station and a water turbine can be reduced, and the excavation amount is reduced; on the other hand, certain air resistance can be formed due to certain pressure air between the impeller chamber and the impeller, partial liquid backflow is reduced, and the efficiency of the pump is improved.

Drawings

FIG. 1 is a schematic structural view of the present invention;

wherein, 1, impeller chamber, 2, impeller, 3, breather ring, 4, air inlet.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below.

As shown in fig. 1, a novel impeller chamber structure for reducing water pump cavitation comprises an impeller chamber 1, wherein a rotating impeller 2 is arranged in the impeller chamber 1, and an arc-shaped groove is formed in the inner wall of the impeller chamber 1; a ventilation ring 3 is embedded and connected in the arc-shaped groove; the side wall of the impeller chamber 1 is provided with an air inlet 4, the air inlet 4 is communicated with a ventilation ring 3, and the diameter of the ventilation ring 3 is 20 mm; the ventilation ring 3 is located 60mm below the impeller 2, a plurality of ventilation holes are formed in the ventilation ring 3, the number of the ventilation holes is 20, and the diameter of each ventilation hole is 2-5 mm; the vent hole faces to the direction of a gap formed between the outer edge of the impeller 2 and the impeller chamber 1.

The working principle is as follows: air is fed through the air inlet 4 through the ring 3, and is discharged through the vent hole, the gas sprayed out of the vent hole improves the pressure of the outer edge of the impeller 2 and the area of the impeller chamber 1 to be higher than the vaporization pressure to form a high-pressure zone, and the cavitation is blocked from the source.

The present invention is not limited to the embodiments described above, and those skilled in the art may make modifications or changes within the scope of the disclosure without departing from the spirit of the present invention, so that the scope of the present invention is defined by the appended claims.