CN103835988B - A kind of centrifugal pump impeller - Google Patents

Abstract

A centrifugal pump impeller, including an impeller disc and several blades. There is a circular groove in the middle of the impeller disc, and a ring with teeth on the inner side is placed in the annular groove. The toothed side on the inner side of the ring is Engaged with a small gear, the same number of screw holes are evenly distributed on the ring and the edge of the impeller disc at an angle, and there are two holes at both ends of each blade to fix one end of the blade on the impeller disc , and the other end is fixed on the toothed ring on the inner side. The length of the blade can be extended and shortened, but not out of joint. By turning the pinion, the ring can be turned, thereby changing the length of the blade and changing the installation angle of the blade at the inlet and outlet of the impeller. The beneficial effect of the invention is that the blades of the centrifugal pump can be adjusted, so that the performance of the centrifugal pump can be adjusted.

Description

A centrifugal pump impeller

technical field

The invention relates to a centrifugal pump impeller, which belongs to thermal energy and power engineering equipment parts.

Background technique

The most commonly used pump is the centrifugal pump, followed by the axial flow pump, both of which work on different principles. Both have impellers with blades on them. The installation position of the blades on the impeller (such as inlet installation angle and outlet installation angle) has a great relationship with the lift and flow of the pump. The theoretical head formula of the centrifugal pump is: H _T∞ =1∕g(u ₂ v ₂ cosβ ₂ -u ₁ v ₁ cosβ ₁ ), where β ₁ and β ₂ are the installation angles of the blades at the impeller inlet and outlet respectively, This formula reflects the quantitative relationship between blade position and lift. In order to meet the needs of different lifts, flow rates, rotational speeds, and powers, some axial flow pumps have produced blades that can be adjusted. However, centrifugal pumps do not yet have adjustable vanes.

Contents of the invention

The object of the present invention is to provide a centrifugal pump impeller with adjustable blades.

The technical solution adopted by the present invention to solve the technical problem is: a centrifugal pump impeller, including an impeller disc and a plurality of blades, a circular groove in the middle of the impeller disc, and a toothed ring on the inner surface In the annular groove, the toothed side of the inner surface of the ring meshes with a small gear, and the same number of screw holes are evenly distributed on the ring and the edge of the impeller disc at an angle, and the two ends of each blade All have two holes, and two screws pass through the two holes on the blade to install the blades in the screw holes on the edge of the ring and the impeller disc in sequence. The blade is composed of several rectangular blocks with convex grooves and rectangular blocks with concave grooves, which are inlaid and connected sequentially. There is a small gap between the convex grooves and the concave grooves, and the grooves of the convex grooves The inner edge is notched except two ends, and the two ends of the notch corresponding to the concave groove are provided with blocking blocks. There is a through hole at the center of the pinion. The shape of the through hole is a hexagonal hole at the top and a small round hole at the bottom. There is a screw in the small round hole to fix the pinion on the impeller disk. There is a blocking sheet on the impeller disk, a part of the blocking sheet is pressed on the circular ring, and the other part is fixed on the impeller disk by a screw. The number of the impeller discs can be 1-2. The working principle of the present invention is: the length of the blade can be extended and shortened; one edge of the groove of the convex groove is notched except two ends, and the two ends of the place where the notch corresponds to the concave groove have stoppers to ensure Each rectangular block will not be out of joint; one end of the blade is fixed on the impeller disc, and the other end is fixed on the toothed ring on the inner side. By turning the pinion, the ring can be rotated, thereby changing the length of the blade and changing the position of the blade on the impeller. Inlet and outlet mounting angles. The pinion can be turned by means of a suitable Allen tool, and the pinion can be fastened by tightening the screw inside the pinion. The function of the blocking sheet is to prevent the ring from falling off. If the number of the impeller discs can be one, the formed impeller is a semi-closed impeller; if the number of the impeller discs can be two, the formed impeller is a fully enclosed impeller.

The beneficial effect of the present invention is that the blades of the centrifugal pump can be adjusted, so that the performance of the centrifugal pump can be adjusted.

Description of drawings

Fig. 1 is one of the types of the structural principle diagram of the present invention, and the installation angle of the blade in the figure is relatively small.

Fig. 2 is the second type of the structural principle diagram of the present invention, and the blade installation angle in the figure is relatively large.

Fig. 3 is a front view of the pinion.

Fig. 4 is a schematic diagram of the structure of the present invention when there are two impeller disks.

In the figure 1. Impeller disc, 2. Ring, 3. Pinion, 4. Blade, 5. Rectangular block with convex groove, 6. Rectangular block with concave groove, 7. Screw, 8. Stop piece.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings.

Fig. 1 is one of the types of the structural principle diagram of the present invention, there is a circular groove in the middle of the impeller disc 1, and a circular ring 2 with teeth on the inner surface is placed in the annular groove, and the toothed inner surface of the ring 2 is placed in the annular groove. One side meshes with the pinion 3, and there are six blades 4 on the top of the impeller disc 1, and the blades 4 are composed of several rectangular blocks 5 with convex grooves and rectangular blocks 6 with concave grooves connected in sequence. The sectional view of the rectangular block 5 with the convex groove and the rectangular block 6 with the concave groove is shown in the upper right of Fig. 1, and the length of the blade 4 can be extended or shortened. There are two holes at both ends of each blade 4, and the screws 7 pass through the two holes on the blade to install the blades in the screw holes on the edge of the ring 2 and the impeller 1 disc in sequence. The front view of the pinion 3 is shown in Figure 3. There is a through hole at the center of the pinion 3. The shape of the through hole is a hexagonal hole at the top and a small circular hole at the bottom. There is a screw in the small round hole to fix the pinion 3 on the impeller disc 1 . There are several blocking sheets 8 on the impeller disc 1, and the effect of the blocking sheets 8 is to prevent the annulus 2 from coming off. When the pinion 3 is rotated with an inner hexagonal tool, the ring 2 can be rotated, thereby changing the installation angle of the blades at the inlet and outlet of the impeller, and changing the shape in Fig. 1 to the shape in Fig. 2 . The pinion can be fixed by tightening the screw in the pinion 3 with a screwdriver. During actual operation, the hexagonal tool and the screwdriver extending into the pinion 3 can punch a screw hole on the pump casing to realize adjusting the blade angle without disassembling the pump. The impeller shown in Figure 1 is a semi-closed impeller. If another impeller disc is added, the shape of the impeller becomes the shape shown in Figure 4. Such an impeller is a fully enclosed impeller. The upper part of the impeller is the water inlet, and the lower part is fixed to the shaft. Such a fully enclosed impeller is widely used.

Claims (5)

1. A centrifugal pump impeller, comprising an impeller disc and some blades, characterized in that: a circular groove is arranged in the center of the impeller disc, and a ring with teeth on the inner side is placed in the circular groove, so The toothed side of the inner surface of the ring meshes with a small gear, and the same number of screw holes are evenly distributed on the ring and the edge of the impeller disc at an angle, and there are two holes at both ends of each blade. There are two screws passing through the two holes on the blades to install the blades sequentially in the screw holes on the edge of the ring and the impeller disk. 2. A centrifugal pump impeller according to claim 1, characterized in that: the blades are composed of several rectangular blocks with concave grooves and rectangular blocks with convex grooves, which are inlaid with each other and connected in sequence. There is a small gap between the shaped groove and the convex groove, and an edge in the groove of the convex groove is notched except two ends, and there are blocking blocks at both ends of the place where the notch corresponds to the concave groove. 3. A centrifugal pump impeller according to claim 1, characterized in that: the center of the pinion has a through hole, the shape of the through hole is an inner hexagonal hole at the top, and a small round hole at the bottom, the There is a screw in the small round hole to fix the pinion on the impeller disc. 4. A centrifugal pump impeller according to claim 1, characterized in that: there is a blocking piece on the impeller disc, a part of the blocking piece is pressed on the ring, and the other part is fixed on the ring by a screw. on the impeller disk. 5. The centrifugal pump impeller according to claim 1, characterized in that: the number of said impeller discs can be 1-2.