JPS5836198B2 - Vortex pump impeller - Google Patents

Description

[Detailed description of the invention] The present invention relates to an impeller for a vortex pump.

Conventionally, high-strength brass was used for the impellers of vortex pumps, and the grooves between each vane were forged into shapes. Although it has the disadvantage of being easy to process, it has disadvantages such as deterioration of corrosion resistance and wear resistance due to this phenomenon.
These days, they are hardly used, and in general, more powerful guns made of gunmetal are in use.

In the case of gunmetal, the grooves between each blade cannot be shaped by forging, so the grooves must be cut one by one, which is extremely time-consuming and requires a lot of man-hours. The cost was high.

Furthermore, stainless steel, which is cheaper than gunmetal, is hard and has poor machinability, so it is not used for impellers that require cutting as described above.

In view of the above-mentioned points, the present invention was invented to provide a device which can be made of stainless steel without being limited in material, is easy to process, and can contribute to cost reduction.

Next, an embodiment of the present invention will be described with reference to the drawings. The plate portion 3 of the impeller 1 excluding the boss 2 is formed by laminating a plurality of impeller constituent plates 3a formed by press punching plate materials such as stainless steel plates. Each impeller component plate 3a has a disc portion corresponding to the center of the impeller 1 and a notch corresponding to the groove 1 between each blade, as shown in FIG. 1 (FIG. 2), for example. In addition, several types of left and right parts with different notch sizes are punched out, and the left and right parts are stacked on both sides of the disc part in order from the one with the smallest notch size so that the left and right parts are symmetrical, and this overlapped plate part 3. Required locations on the outer periphery, especially the portions of the blades 4, are welded together to integrate the plate portion 3.6 o-j The more welded locations 5 there are, the higher the strength will be.

Then, a separately formed boss 2 is fitted onto the inner periphery of the plate portion 3,
Connect the required parts between the plate part 3 and the boss 2 by welding or the like,
After the whole is integrated, the outer periphery can be cut to eliminate unevenness.

6 indicates the welding location.

It is preferable for each impeller control plate 3a to be thin, as shown in FIG. 3, as the shape of the groove 7 will be similar to that obtained by cutting. However, if it is made too thin, it will take a lot of work to laminate the plate, and the plate may peel off. Therefore, use one with an appropriate thickness considering the purpose, strength, etc.

In particular, since the impeller component plate 3a has a roundness on one side of the punched outer shape due to the punching process, by superimposing the roundness on the outside as shown in FIG. The influence on the flow can be reduced.

Although the groove 7 becomes step-like even if it is tilted, the pump efficiency is only slightly reduced, and there is no problem in practical implementation.

As described above, the present invention is made by laminating a plurality of punched impeller structure plates, so there is no need to cut the grooves between each blade, and each impeller structure plate can be Even if polymerization and bonding are required, the number of processing steps can be significantly reduced and processing costs can be reduced.

In particular, since the impeller component plate is stamped using a press, it is suitable for mass production, and the material is not limited; stainless steel plates can also be used, making the material cost lower than gunmetal. Furthermore, it is possible to provide a material that is hard and has excellent corrosion resistance and wear resistance.

As described above, the present invention can reduce both material costs and processing costs, greatly contributing to cost reduction, and has sufficient durability without any restrictions on the material.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a perspective view, FIG. 2 is a vertical front view, and FIG. 3 is a partial sectional view showing another embodiment. 1... Impeller, 2... Boss, 3...
...One plate part, 3a... Impeller component plate.

Claims (1)

[Scope of Claims] 1. An impeller for a vortex flow pump, which is formed by laminating a plurality of stamped impeller structures or plates. 2. The impeller for a vortex flow pump according to claim 1, wherein the impeller structure or plate is a stainless steel plate.