Novel open impeller

Abstract

The invention discloses a novel open impeller which comprises a hub, three blades are arranged on the hub, each blade is composed of an acting blade and a drainage blade, each drainage blade is of a fan-shaped structure, each acting blade is of a strip-shaped structure, the acting blades are perpendicularly arranged on the edges of the drainage blades, the working faces of the acting blades are tangent to the rims of the drainage blades, and the drainage blades are arranged on the hub. Balance holes are formed in the drainage blades; in the three blades, two of the blades are the first blade, the other blade is the second blade, the first blade and the second blade are arranged in a staggered mode in the axial direction, the first drainage blade is the inward-inclined blade, the second drainage blade is the outward-inclined blade, and through the ingenious combination design of the drainage blades and the acting blades, effective guiding of backflow fluid on the tail edges of the blades is achieved; therefore, the device participates in repeated cyclic motion. By means of the innovation, the negative influence of backflow fluid on the working capacity of the blades is avoided, the energy conversion efficiency is greatly improved, and therefore the overall working performance of the open type impeller is remarkably improved.

Description

Technical Field

[0001] The invention relates to a centrifugal impeller, in particular to a novel open impeller. Background Art

[0002] Open centrifugal impellers are widely used in conveying media with high solid content (such as ore pulp, sludge), low viscosity liquids (such as cooling water, light liquids) and corrosive liquids (such as acid and alkali solutions) because of their unobstructed flow channels and non-clogging characteristics. In addition, they are also suitable for working conditions with large flow changes, and are widely used in mining, chemical industry, sewage treatment and other fields due to their easy maintenance and good durability. However, the existing open impellers are prone to a large amount of backflow at the trailing edge of the blades due to their wide flow channels. After these backflow fluids return to the flow channels, they seriously affect the working capacity of the impeller. Summary of the invention

[0003] The technical task of the present invention is to provide a new open impeller in view of the deficiencies of the above prior art.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a new type of open impeller, including a hub, wherein three blades are arranged on the hub, the blades are composed of working blades and drainage blades, the drainage blades are in a fan-shaped structure, the working blades are in a strip-shaped structure, the working blades are vertically arranged on the edge of the drainage blades, the working surfaces of the working blades are tangent to the rims of the drainage blades, and a balancing hole is arranged on the drainage blades; among the three blades, two blades are blades one, and the other blade is blade two, the blade one and the blade two are staggered in the axial direction, the blade one is composed of a working blade one and a drainage blade one, the drainage blade one is an inward-inclined blade, the blade two is composed of a working blade two and a drainage blade two, and the drainage blade two is an outward-inclined blade.

[0005] Further improvement: the wrap angle Φ1 of the guide blade is 125°, wherein the wrap angle Φ2 of the working blade one is Φ2=(0.55~0.65)Φ1, the angle between the inlet edge of the guide blade one and the inlet edge of the working blade one is α1=(0.5~0.6)Φ1, the wrap angle of the working blade two is Φ3=(0.15~0.25)Φ1, and the angle between the inlet edge of the guide blade two and the inlet edge of the working blade two is α2=(0.8~0.9)Φ1.

[0006] Further improvement: the blade outlet radius is R, the distance between blade one and blade two is L=(0.05~0.1)R, the diameter of the balancing hole is D=(0.001~0.003)R, the angle α3 between the inlet edge of the guide blade and the balancing hole is α3=(0.45~0.55)Φ1, and the thickness of the working blade is H=(0.07~0.1)R.

[0007] The advantages of the present invention are as follows: through the ingenious combination design of the guide blade and the working blade, the return fluid at the trailing edge of the blade is effectively guided so that it participates in repeated circulation. This innovation avoids the negative impact of the return fluid on the working ability of the blade, greatly improves the energy conversion efficiency, and thus significantly improves the overall working performance of the open impeller. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the structure of the present invention.

[0009] Figure 2 This is a positional relationship diagram between blade 1 and blade 2 of the present invention.

[0010] Figure 3 It is a schematic diagram of the dimensions of blade 1 of the present invention.

[0011] Figure 4 It is a schematic diagram of the dimensions of blade 2 of the present invention.

[0012] Figure 5 It is a schematic diagram of the flow of various fluids in the impeller of the present invention.

[0013] In the figure; hub 1, blade 2, blade 1 21, blade 2 22, guide blade 3, flow blade 1 31, flow blade 2 32, working blade 4, working blade 1 41, working blade 2 42, balance hole 5. DETAILED DESCRIPTION

[0014] The present invention is described in detail below with reference to the accompanying drawings.

[0015] As shown in the figure, a novel open impeller comprises a hub 1, wherein three blades 2 are arranged on the hub 1, wherein the blades 2 are composed of a working blade 4 and a guide blade 3, wherein the guide blade 3 is in a fan-shaped structure, and the working blade 4 is in a strip-shaped structure, wherein the working blade 4 is vertically arranged at the edge of the guide blade 3, wherein the working surface of the working blade 4 is tangent to the rim of the guide blade 3, and wherein a balancing hole 5 is arranged on the guide blade 3; wherein among the three blades, two blades are blades 1 21, and the other blade is blade 2 22, wherein blade 1 21 and blade 2 22 are staggered in the axial direction, wherein blade 1 21 is composed of a working blade 1 41 and a guide blade 1 31, wherein the guide blade 1 31 is an inward-inclined blade, wherein blade 2 22 is composed of a working blade 2 42 and a guide blade 2 32, wherein the guide blade 2 32 is an outward-inclined blade.

[0016] The wrap angle Φ1 of the guide blade 3 is 125°, wherein the wrap angle Φ2 of the working blade 41 is (0.55~0.65)Φ1, the included angle α1 between the inlet edge of the guide blade 31 and the inlet edge of the working blade 41 is (0.5~0.6)Φ1, the wrap angle Φ3 of the working blade 42 is (0.15~0.25)Φ1, and the included angle α2 between the inlet edge of the guide blade 32 and the inlet edge of the working blade 42 is (0.8~0.9)Φ1.

[0017] The outlet radius of the blade 2 is R, the distance between the blade 1 21 and the blade 2 22 is L=(0.05~0.1)R, the diameter of the balancing hole 5 is D=(0.001~0.003)R, the angle α3 between the inlet edge of the guide blade 3 and the balancing hole 5 is α3=(0.45~0.55)Φ1, and the thickness of the working blade 4 is H=(0.07~0.1)R.

[0018] Its working principle is: in the present invention, blade 1 21 serves as the main energy conversion blade, while blade 2 22 is mainly used to guide the movement of axially leaked fluid. The specific working process is as follows: when the fluid enters from the inlet, the leading edge of blade 1 21 first constrains the fluid to the direction of the working blade 4, and the mainstream is pushed by the working blade 4 and discharged radially from the impeller. At the same time, the return fluid generated by the trailing edge of the working blade 4 can be returned to the guide blade 3 of the adjacent blade 2 to continue the periodic circulation process. In addition, since there is partial fluid leakage in the axial direction of blade 1 21, blade 2 22 is arranged at the rear position of the axial direction to guide this part of the leaking fluid to move radially.

[0019] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A novel open impeller, comprising a hub, characterized in that: Three blades are arranged on the hub, and the blades are composed of working blades and drainage blades. The drainage blades are in a fan-shaped structure, and the working blades are in a strip-shaped structure. The working blades are vertically arranged on the edge of the drainage blades, and the working surfaces of the working blades are tangent to the rim of the drainage blades. A balancing hole is arranged on the drainage blades. Among the three blades, two blades are blades one, and the other blade is blade two. Blade one and blade two are staggered in the axial direction. Blade one is composed of working blade one and drainage blade one, and drainage blade one is an inward-inclined blade. Blade two is composed of working blade two and drainage blade two, and drainage blade two is an outward-inclined blade.

2. A novel open impeller according to claim 1, characterized in that: The wrap angle Φ1 of the guide blade is 125°, wherein the wrap angle Φ2 of the working blade one is (0.55~0.65)Φ1, the included angle α1 between the inlet edge of the guide blade one and the inlet edge of the working blade one is (0.5~0.6)Φ1, the wrap angle Φ3 of the working blade two is (0.15~0.25)Φ1, and the included angle α2 between the inlet edge of the guide blade two and the inlet edge of the working blade two is (0.8~0.9)Φ1.

3. A novel open impeller according to claim 1, characterized in that: The blade outlet radius is R, the distance between blade one and blade two is L=(0.05~0.1)R, the diameter of the balancing hole is D=(0.001~0.003)R, the angle α3 between the inlet edge of the guide blade and the balancing hole is α3=(0.45~0.55)Φ1, and the thickness of the working blade is H=(0.07~0.1)R.

Images