JPH0322560Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to impellers for blowers, pumps, and the like.

[Conventional technology]

Impellers, especially impellers for blowers that handle gases that contain a lot of solid particulate dust, such as those used for boiler waste gas or for exhausting air with a lot of dirt and dust, are equipped with metal liners or metal liners for parts that are prone to wear. It has been given wear-resistant overlay and has been used after many repairs.

However, all of them have short lifespans and require frequent repairs, resulting in a decrease in the operating rate of the equipment and a great deal of time and effort lost due to repairs.

In recent years, ceramics have been used as a material with excellent wear resistance, and wear-resistant pieces are attached to blades to protect the base material.

[Problem that the invention attempts to solve]

However, in conventional impellers, wear-resistant pieces with square or rectangular surfaces are often arranged side by side from the end where they begin to be attached to the blade, and the boundaries between the wear-resistant pieces, which are approximately parallel to the dust flow direction, are multiple. Dust and foreign matter flowed through the boundary lines that continued across the rows, causing severe erosion of the base material from these areas, which was a problem.

The present invention aims to eliminate these conventional problems and provide an impeller that can reduce erosion of the base material from the interface by fluid.

[Means for solving problems]

The present invention provides an impeller in which a plurality of wear-resistant pieces are attached adjacent to the blades, the wear-resistant pieces are made of ceramic, and each wear-resistant piece is arranged in a shape and arrangement without a boundary line parallel to the fluid flow direction. This is an impeller characterized by the fact that the impeller is arranged on the blade surface.

〔Example〕

An embodiment in which the present invention is applied to a blower will be described with reference to the drawings.

In FIGS. 1 to 3, the impeller 1 has a hub 2,
It consists of a main plate 3, a side plate 4, and a blade 5, and a wear-resistant piece 6 made of ceramic with a U-shaped cross section is attached to the inlet edge 7 of the blade 5, and the surface of the blade 5 is oriented in the direction of fluid flow. A large number of parallelogram-shaped ceramic wear-resistant pieces 8 with no parallel edges are arranged in the dust flow direction 1.
5 and the boundary line 11 are not parallel to each other, a plurality of rows of wear-resistant pieces 8 are pasted in a staggered manner every other row.

Therefore, since the boundary line 11 is not parallel to the dust flow direction 15, erosion of the base material from the boundary line 11 is largely prevented.

Even if wear-resistant pieces of different shapes are arranged side by side, or when wear-resistant pieces of the same shape are arranged side-by-side in different directions, even if only a part of the boundary line 11 and the dust flow direction 1
5 should not be parallel.

In FIG. 4, hexagonal wear pieces 8 are arranged so that none of the boundary lines 11 between adjacent wear pieces 8 are parallel to the dust flow direction 15. In this case, a large number of wear-resistant pieces 8 are laid out on an adhesive sheet and integrated together before being pasted, but when making this integrated sheet, hexagonal wear-resistant pieces 8 are placed on an inclined surface. 8 and when vibrated, they will naturally stick together and form a honeycomb arrangement, making it extremely easy to create an integrated sheet.

FIG. 5 shows an example in which square wear-resistant pieces 8 are arranged at an angle of about 45 degrees to the dust flow direction 15, and in either case, no boundary line parallel to the dust flow direction occurs.

In the above-described embodiment, the wear-resistant pieces 8 are attached to the blades with an adhesive, but a similar arrangement can be used when they are attached mechanically.

Although the above description has been made regarding a blower, the invention can be applied not only to blowers but also to fluid machines including pumps.

[Effect of idea]

In this invention, the wear-resistant pieces are made of ceramic, and each wear-resistant piece is arranged on the blade surface in a shape and arrangement that does not have a boundary line parallel to the fluid flow direction. The impeller has no place parallel to the wear-resistant piece, which eliminates the flow of dust and foreign matter through the boundary line, and reduces erosion of the base material due to fluid injection from the wear-resistant piece boundary line, preventing the wear-resistant piece from falling off. It can also be used for a long period of time and has good durability.

[Brief explanation of the drawing]

The drawings relate to an embodiment of the present invention, and FIG. 1 is a front view of the impeller, FIG. 2 is a longitudinal sectional view thereof, and FIG.
The figure is a plan view of the wear-resistant piece on the blade surface, Figures 4 and 5.
The figures are plan views of the blade surfaces of different embodiments. 1... impeller, 2... hub, 3... main plate, 4...
... Side plate, 5 ... Vane, 6 ... Wear-resistant piece, 7 ... Inlet edge, 8 ... Wear-resistant piece, 11 ... Boundary line, 15 ... Dust flow direction.

Claims (1)

[Scope of utility model registration request] In an impeller in which a plurality of wear-resistant pieces are attached adjacent to the blade, the wear-resistant pieces are made of ceramic, and each wear-resistant piece is arranged on the blade surface in a shape and arrangement that has no boundary line parallel to the fluid flow direction. An impeller characterized by being deployed.