JPS5934499A - Impeller for blower - Google Patents

Abstract

PURPOSE:To improve durability by fitting a high antiwear property ceramic reinforcement in the side end of a gas suction port of each blade. CONSTITUTION:A fit reinforcement 7 constituted from ceramics is formed on the end with a U-shaped bent surface 7a and provided in the inside central portion with a fit groove 7b fitting the side end of a suction port of a blade 5 and cut out of the base end surface. The fit reinforcement 7 thus constituted is further provided on one side end face with a side socket 7d and on the other side end face with a side projection 7c. A plurality of the fit reinforcements 7 constitute a socket system coupling integrally connected by one side projection 7c inserted into the other side socket 7d of adjacent reinforcement. The ceramic fit reinforcement has large bending strength, particularly extremely high hardness at the room temperature and high temperature and very high anti-wear property so that each blade is prevented from wear even under hard environment and condition and its durability is remarkably improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an impeller for a blower installed in various industrial furnaces for blowing or exhausting air, and is intended to improve the service life of the impeller.

Conventionally, this type of blower mainly consists of an impeller and a casing, both of which are made of metal, mainly cast iron or steel.

The gas that passes through the blower contains a wide variety of foreign substances and dust depending on the equipment in which it is installed, its constituent materials, the raw materials used, and even the environment of the product. As is well known, blowers are used under extremely harsh conditions. In particular, foreign substances mixed in heavy industry-related furnaces are often highly abrasive, such as various ores, slag, coke, coal, bricks, slag, and earth and sand. The wear and damage of the blades in the parts close to the blades was extremely severe, and they had to be replaced frequently, resulting in an extremely troublesome and grave problem in which the operation of the equipment had to be interrupted.

Some attempts have been made to weld a hardfacing material made of wear-resistant alloy or to line the gas inlet portion of the impeller with a liner, but the wear resistance is still insufficient.
At present, satisfactory results have not yet been obtained.

This invention was made in order to solve the above-mentioned conventional problems and to meet the demands of the industry. This was achieved by creating a structure in which a reinforcing fitting member molded from wear-resistant ceramic is fitted.

Next, this invention will be described in detail with reference to the embodiments shown in the drawings. First, there is a casing having a suction (on one side) and an outlet 3, an impeller rotating within the casing by power drive of a shaft B. So, multiple blades 5 are attached. Next, 7 is a reinforcing fitting made of ceramic material of the quality shown in Table 1, and as shown in Figures 5 and 4 of the drawings, the tip is formed into a U-shaped tip curved surface 7a. A fitting groove 7h, which fits into the suction port 2 side end portion of the blade j, is provided in the inner center portion by cutting from the base end surface. Roughly speaking, the reinforcing fitting member 7 with the above configuration is
A side support lower d is provided on the side end surface, and a side protrusion 7C corresponding to the side support lower d is provided on the other side end surface, and the plurality of reinforcing fitting members 7 are adjacent to one side protrusion. 7t is a socket type joint that is inserted into the other side support lower d and connected as one unit.

Therefore, in this invention, the suction port portion of each blade j of the impeller! A plurality of reinforcing members 7 connected to each other by the socket type joints are connected to the side ends of the reinforcing members 7, as shown in Figure 3. As shown in the figure, these are provided by fitting into fitting grooves 7b, respectively.

table /.

As described above, in this invention, a reinforcing fitting member made of a wear-resistant ceramic material is fitted to the end of the suction port side of each blade of the impeller, so that the ceramic reinforcing fitting member has a high bending strength. It has extremely high hardness, especially at room temperature and high temperature, and has excellent abrasion resistance, and can completely and strongly protect the gas inlet part of each blade, which is the most susceptible to wear and damage. Prevents wear on each vane in any harsh environment or conditions, such as when pumping gas containing highly abrasive foreign substances such as various ores, slag, coke, coal, bricks, slag, and dirt. However, it has the outstanding effect of significantly improving its service life. Therefore, there is no need for frequent replacement of blades or interruption of equipment operation unlike in the past, and there are excellent effects such as long-term stable use is guaranteed.

In addition, in this invention, a method is adopted for attachment by fitting the ceramic reinforcing surface member to the end of the blade using a concave-convex fitting method, which makes the fitting more advantageous due to the centrifugal force effect caused by the rotation of the impeller. It is something that can be made effective.

In addition, if the tip of the reinforcing fitting member is made into a U-shaped tip curved surface as shown in the embodiment of the drawing, it is mechanically most advantageous against impact with mixed foreign matter, and also in order to prevent collision of the flow of the blade. will also be beneficial. Furthermore, if the reinforcing fitting member is a multi-section structure using an inro joint type, adjacency that may occur due to the difference in thermal expansion coefficient between the metal impeller and the ceramic reinforcing surface member due to the temperature of the passing gas body. In response to the problem of opening gaps between ceramic members,
This can be effectively handled by preventing the passing gas from coming into direct contact with the metal impeller.

Embodiment A blower constructed according to the present invention is
When installed in the furnace top dust collector of a steelmaking blast furnace and put into practical use with the following specifications, the amount of wear (thickness) was measured after 1 year of continuous use, and the maximum wear was only 7 mm, which was an extremely small amount. , is still in operation.

Conventional metal impellers had an average lifespan of about two months, and were so worn that they were no longer usable.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a longitudinal side view of a conventional blower, FIG. 1 is a longitudinal front view of the same, and FIG. is a perspective view of the same, FIG. 5 is a front view of the casing of the ceramic reinforcing fitting member, and FIG. 3 is a side view of the same. /09. casing, 250. Suction port, 3.0. Sending [+)ll...impeller, j,...impeller, Otsu1. ．． shaft,
7.・, Reinforcement fitting member, 7θ20. Tip curved surface A7b...
・Fitting groove, 7C・0. Side protrusion, 7d... Side socket, Patent applicant Tokyo Ceramics Co., Ltd. Hamaba J Blower Co., Ltd. (7) 1%l Figure

Claims (1)

[Claims] An impeller for a centrifugal blower, characterized in that a reinforcing fitting member made of a wear-resistant ceramic material is fitted to the suction port side end of each blade of the impeller.