CN211778241U

CN211778241U - Stifled fastening structure is prevented in single-stage single impeller import of inhaling

Info

Publication number: CN211778241U
Application number: CN201922405442.5U
Authority: CN
Inventors: 陆霞杰; 胡凯
Original assignee: Shanghai Liancheng Group Co Ltd
Current assignee: Shanghai Liancheng Group Co Ltd
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2020-10-27
Anticipated expiration: 2029-12-27

Abstract

The utility model relates to a stifled fastening structure is prevented in single-stage single suction impeller import, including axle, impeller retaining ring, hexagon socket head cap screw, its characterized in that: the impeller is sleeved on the front portion of the shaft, an inner hole of the impeller sleeve is matched with the outer circle of the shaft, an inner sunken threaded hole is formed in the end face of the shaft, a water guide surface is arranged on the outer side of an impeller retaining ring, a through hole is formed in the center of the end face of the impeller retaining ring, a counter bore is formed in the front of the through hole, the size of the counter bore is slightly larger than that of an inner hexagonal cylindrical head screw, the inner hexagonal cylindrical head screw penetrates through the through hole formed in the impeller retaining ring, and the inner hexagonal cylindrical. The water guide surface at the outer side of the impeller retainer ring is in smooth transition with the curved surface of the impeller surface. The utility model has the advantages that simple to operate, structure are reliable for liquid is more smooth and easy before getting into the impeller runner, improves the flow state of impeller import department, reduces the loss, thereby improves the efficiency of pump, promotes the cavitation performance.

Description

Stifled fastening structure is prevented in single-stage single impeller import of inhaling

Technical Field

The utility model relates to a stifled fastening structure is prevented in single-stage list suction impeller import.

Background

The existing single-stage single-suction centrifugal pump (see fig. 1) usually has external threads reserved on the shaft, and the impeller (fig. 1, number 12) is mounted on the shaft (fig. 1, number 11) and locked by a cap-type nut (fig. 1, number 13). Because the cap nut is large in size, a minimum area (A size in the figure) is formed between the nut and the front cover plate of the impeller, the area is suddenly contracted, meanwhile, six sides of the nut rotate at high speed, the good flow state of an impeller inlet is damaged, the hydraulic loss at the impeller inlet is increased, the structure can reduce the efficiency of the pump, and the cavitation performance is poor. It is therefore highly desirable to improve the construction of existing single stage, single suction centrifugal pumps.

Disclosure of Invention

The utility model aims at solving the problem of impeller inlet flow channel blockage and poor flow state in the prior art. The utility model provides a novel prevent blockking up fastening structure for under simple to operate, the reliable prerequisite of structure, make liquid more smooth and easy before getting into the impeller runner, improve the flow state of impeller import department, reduce the loss, thereby improve the efficiency of pump, promote the cavitation performance. The utility model relates to a stifled fastening structure is prevented in single-stage single suction impeller import, including axle, impeller retaining ring, hexagon socket head cap screw, its characterized in that: the impeller is sleeved on the front portion of the shaft, an inner hole of the impeller sleeve is matched with the outer circle of the shaft, an inner sunken threaded hole is formed in the end face of the shaft, a water guide surface is arranged on the outer side of an impeller retaining ring, a through hole is formed in the center of the end face of the impeller retaining ring, a counter bore is formed in the front of the through hole, the size of the counter bore is slightly larger than that of an inner hexagonal cylindrical head screw, the inner hexagonal cylindrical head screw penetrates through the through hole formed in the impeller retaining ring, and the inner hexagonal cylindrical. The water guide surface at the outer side of the impeller retainer ring is in smooth transition with the curved surface of the impeller surface. The utility model has the advantages that simple to operate, structure are reliable for liquid is more smooth and easy before getting into the impeller runner, improves the flow state of impeller import department, reduces the loss, thereby improves the efficiency of pump, promotes the cavitation performance.

Drawings

Fig. 1 is a schematic sectional view of a structure of the prior art.

Fig. 2 is a structural section view of the present invention.

Fig. 3 is a sectional view of the impeller retainer ring of the present invention.

Detailed Description

In the figure, a single-stage single-suction impeller inlet anti-blocking fastening structure comprises a shaft 1, an impeller 2, an impeller retainer ring 3 and an inner hexagonal cylindrical head screw 4, and is characterized in that: the impeller is sleeved on the front portion of the shaft, an inner hole of the impeller sleeve is matched with the outer circle of the shaft, an inner sunken threaded hole 5 is formed in the end face of the shaft, a water guide surface 6 is arranged on the outer side of an impeller retaining ring, a through hole 7 is formed in the center of the end face of the impeller retaining ring, a counter bore 8 is formed in front of the through hole, the size of the counter bore is slightly larger than that of an inner hexagonal socket head cap screw, the inner hexagonal socket head cap screw penetrates through the through hole formed in the impeller retaining ring, and the inner hexagonal. The water guide surface at the outer side of the impeller retainer ring is in smooth transition with the curved surface of the impeller surface.

The inner hexagonal socket head cap screw penetrates through the impeller retaining ring and is screwed in the threaded hole at the shaft head, and the impeller retaining ring and the impeller are tightly pressed by screwing the screw, so that the fastening effect is achieved.

Because the outer side of the impeller retainer ring is provided with the water guide surface, the water guide surface at the outer side of the impeller retainer ring is in smooth transition with the curved surface of the impeller surface. The inflow is enabled to accord with the flowing rule better, the liquid is enabled to be smoother before entering the impeller flow channel, the flow state at the impeller inlet is improved, the loss is reduced, the efficiency of the pump is improved, and the cavitation performance is improved.

Claims

1. The utility model provides a stifled fastening structure is prevented in single-stage single impeller import of inhaling, includes axle, impeller retaining ring, hexagon socket head cap screw, its characterized in that: the impeller is sleeved on the front portion of the shaft, an inner hole of the impeller sleeve is matched with the outer circle of the shaft, an inner sunken threaded hole is formed in the end face of the shaft, a water guide surface is arranged on the outer side of an impeller retaining ring, a through hole is formed in the center of the end face of the impeller retaining ring, a counter bore is formed in the front of the through hole, the size of the counter bore is slightly larger than that of an inner hexagonal cylindrical head screw, the inner hexagonal cylindrical head screw penetrates through the through hole formed in the impeller retaining ring, and the inner hexagonal cylindrical.

2. The anti-blocking fastening structure for the inlet of the single-stage single-suction impeller according to claim 1 is characterized in that: the water guide surface at the outer side of the impeller retainer ring is in smooth transition with the curved surface of the impeller surface.