JPH03559Y2 - - Google Patents

Description

[Detailed description of the invention] (1) Purpose of the invention The present invention relates to the structure of an impeller for a submersible pump.

Since pumps used underwater suck up sediment, the metal impellers, especially the blades, are subject to significant wear.When worn, they must be replaced with new ones to prevent deterioration of pump performance, which is a time-consuming process. The problem is that it requires a lot of work and is expensive to repair.

In recent years, ceramics such as silicon carbide,
Although it is attracting attention as a material that is lightweight, has high hardness, and has excellent wear resistance, it has the drawback of being weak against impact. When removing the impeller, a method is often used in which a spanner or the like is applied to the back surface of the back plate and the impeller is struck with a hammer, so the impeller needs to be strong enough to withstand the impact. Therefore, it has been thought that it is practically difficult to make the impeller made of ceramic.

The purpose of this invention is to provide an impeller for a submersible pump made of ceramic that can be smoothly extracted and removed without causing any impact to the back plate, has excellent wear resistance, and can withstand long-term use. do.

(3) Structure of the invention In the impeller for a submersible pump according to the invention,
An axial hole is drilled in the center boss of the ceramic back plate with a protruding wing plate, multiple through holes are drilled in the back plate along the outer periphery of the boss, and female screws are inserted in the inner periphery. The engraved eyelet-shaped metal tube is inserted into the light transmitting hole and integrally connected to the back plate by caulking or gluing to form an impeller extraction structure.

To explain the drawings illustrating the embodiments,
Reference numeral 1 denotes a back plate made of ceramic such as silicon carbide, which has a vane plate 2 protruding from its surface 1a, and a shaft hole 4 in which a pump shaft S is fitted in a central boss portion 3. 4 has a key groove 8 carved therein. A plurality of through holes 5...5 are arranged in the back plate 1 along the outer periphery of the boss portion 3, and eyelet-shaped metal tubes 7...7 having internal threads 6 carved into the inner periphery are inserted into the through holes 5... 5 and is integrally connected to the back plate 1 by caulking or gluing to form an impeller removal structure, which is used when removing the impeller from the pump shaft S as shown in FIGS. 3A and 3B. . If the impeller is extracted in this manner, it can be smoothly extracted without applying any impact to the ceramic back plate 1 and vane plate 2.

(3) Effects of the invention According to the invention, it is possible to obtain an impeller for a submersible pump with excellent durability by making the entire impeller made of hard ceramic, and also to have an impeller removal structure on the back plate 1. By providing this, there is an advantage that the impeller can be extracted and removed smoothly without damaging the back plate 1 or the blade plate 2.

[Brief explanation of the drawing]

Figure 1 is a vertical sectional side view of the main parts of the impeller of the present invention, Figure 2
The figure is a plan view of the impeller of the present invention as seen from the front side, and Figures 3A and 3B are longitudinal sectional side views of the main parts showing the impeller of the present invention being removed from the pump shaft. 1... Ceramic back plate, 2... Impeller, 3...
...Boss portion, 4...Shaft hole, 5...Through hole, 6...Female thread, 7...Eye-shaped metal tube.

Claims (1)

[Scope of utility model registration request] A shaft hole 4 is bored in the center boss part 3 of a ceramic back plate 1 on which an impeller 2 is protruded, and a plurality of through holes 5...5 are bored in the back plate 1 along the outer periphery of the boss part 3. Then, the eyelet-shaped metal tubes 7...7 with female threads 6 carved on the inner periphery are inserted into the through holes 5...5, and are integrally connected to the back plate 1 by caulking or gluing to form the impeller removal structure. An impeller for a submersible pump characterized by the following structure: