JPH0211899A - Wear resisting blower - Google Patents

Abstract

PURPOSE:To prevent surfaces of a liner from wearing in its corner part by forming an irregular surface in the surfaces of ceramics along a flow direction of gas in the corner part formed by a bottom wall part of the liner and its side wall part. CONSTITUTION:A channel-shaped liner 20, protected and coated in its internal side surface with ceramics 21, is connected to each blade plate 2 of an impeller. Surfaces of ceramics 21a, 21b in right and left corner parts 25, 26 of the liner 20 are irregularly formed along its lengthwise direction. Consequently, the corner part 25 is prevented from generating a smooth flow of gas, weakening simultaneously even flow energy of dust, and the liner 20 is prevented from easily generating wear in its surface by the dust.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wear-resistant blower in which a liner whose surface is coated and protected with ceramics is attached to blade plates provided radially on an impeller.

[Conventional technology]

The impeller 1 for a blower as shown in FIG. 7, especially for a blower that handles gas containing a lot of fixed fine particles, such as for boiler waste gas, exhaust of earth and sand, dusty air, etc., is as follows. In particular, wear-resistant treatment is required on the surface of each vane plate 2, which is prone to wear. For example, ceramics may be directly bonded to the surface of each vane plate 2, or a protective metallic liner coated with ceramic may be applied to each vane plate. I solved it by installing 2.

Conventionally, when installing a liner, as shown in FIGS. An impeller 1 composed of a main plate 5 and a side plate 6 forming both side walls.
On the other hand, as shown in FIG. 9, a channel-shaped liner 7 consisting of a bottom wall part 8 and left and right side walls 9, 10 is installed from the surface side of the vane plate 2, and the bottom wall part 8 of the liner 7 is A bolt 11 protruding from the blade plate 2 is fastened with a nut 12 from the back side of the blade plate 2.

A bottom wall portion 8 and left and right side wall portions 9, 1 that constitute the liner 7
Ceramics 13 are bonded to each inner surface of the liner 7 to prevent surface abrasion of the liner 7. 14. Before assembling according to 15,
A large number of ceramic pieces of the same shape are bonded in advance to each member 8, 9, 10. By assembling the bottom wall section 8 and the side wall sections 9 and 10 on which these ceramic pieces are laid, a means is taken to cover the inner surface of the liner 7 with the ceramics 13 as a result.

[Problem to be solved by the invention]

However, when the surface of the liner 7 is coated and protected by the above-described means, the ceramic 13 bonded to the bottom wall portion 8
Ceramics 13b, 1 of both ends of a and side wall parts 9, 10
Continuous gaps 16 and 17 are likely to be formed along the gas flow direction at the butt portion with the lower end of liner 3c, and the surfaces of ceramics 13a, 13b, and 13c form smooth surfaces over the entire liner 7. Because of this, the gas flow rate is high, and there is a problem in that the liner 7 itself is subject to wear due to the high flow rate of the dust that has entered the gaps 16 and 17.

Therefore, a technical object of the present invention is to effectively prevent wear of the liner surface at the corner portion between the bottom wall portion and the side wall portion of the liner.

[Means to solve the problem]

In order to solve the above-mentioned problems, the wear-resistant blower according to the present invention has a method in which an uneven surface is formed on the surface of the ceramic along the flow direction of the waste at the corner part of the liner including the bottom wall part and the side wall part. It is said that

[Effect]

According to the above-mentioned means, since an uneven surface is formed on the surface of the ceramic along the direction of gas flow at the corner portion of the liner, the flow velocity of the gas flowing on the surface of the ceramic is weakened by the uneven surface. At the same time, the dust that has entered the gaps between the ceramics and the flow velocity are also weakened, making it possible to prevent surface abrasion of the liner due to dust.

〔Example〕

Embodiments of the present invention will be described in detail below based on the accompanying drawings.

FIG. 1 shows an embodiment of the liner used in the wear-resistant blower according to the present invention, which is similar to the conventional example described above.
A channel-shaped liner 20 whose inner surface is coated and protected with ceramics 21 is fastened to each vane plate 2 of the impeller 1 with bolts 11 and nuts 12.

Unlike the conventional example described above, the liner 20 has a bottom wall portion 22.
The left and right side walls 23 and 24 are integrally formed in advance, and the ceramic 21 is bonded to the entire inner surface thereof. This bonding structure of the ceramics 21 is such that, particularly at the left and right corner portions 25 and 26 of the liner 20, the surface of the ceramic 21a bonded to the inner surface of the left side wall portion 23 and the ceramic 21b bonded to the inner surface of the bottom wall portion 22.
The end surface of the ceramic 21c is in contact with the inner surface of the right side wall 24, and the ceramic 21c is joined to the inner surface of the right side wall 24 on the surface of the ceramic 21b.
The structure is such that the end faces of the two are in contact with each other.

In this embodiment, as shown in FIG.
2 and the left side wall portion 23 (only the corner portion 25 is shown).

The surface of liner 21b is non-uniform along the length of liner 20. That is, these ceramics 21a,
21b is made by laying a large number of rectangular parallelepiped ceramic pieces on the inner surface of the liner 20 and brazing them. For example, among the ceramic pieces to be joined to the bottom wall part 22, pieces A and B are attached to other standard ceramic pieces 27. Of the ceramic pieces C and D joined to the left side wall portion 23, pieces C and D are provided so as to protrude from the surface of the other standard ceramic piece 28.

The small pieces A and B have the same planar shape as the standard ceramic piece 27, as shown in FIGS. It belongs to On the other hand, small piece C
, D has a step formed on the surface side as shown in FIG. 5, and the thickness dimension t1 of the lower part is adjusted to the thickness of the standard ceramic piece 28 shown in FIG. The thickness dimension t2 is approximately twice as large as that of the first embodiment. The height h3 below the stepped portion is large enough to allow the standard ceramic piece 27 to fit therein.

Therefore, in this embodiment, when the inner surface of the liner 20 is covered and protected with the ceramic 21, an uneven surface is formed along the longitudinal direction of the liner 20 at the corner portion 25, as shown in FIG.

Therefore, when gas containing dust flows over the surface of the ceramics 21, the small pieces A, B, C, and D of the ceramics act as weirs, particularly at the corner portions 25, and prevent the smooth flow of the gas.

As a result, the flow force of the dust contained in the gas is weakened at the same time, and even if there is a gap between the ceramics 21a and 21b at the corner part 25 and the dust enters, the liner due to the dust 20 surface wear is less likely to occur.

In the above embodiment, one corner portion 25 has been described, but the other corner portion 26 has a similar configuration.

Furthermore, the configuration of the liner is not limited to the case where the bottom wall and the left and right side walls are integrated in advance as in this embodiment, but the liner may be assembled after bonding ceramics as in the conventional example. also applies.

Further, in the above embodiment, an example was explained in which an uneven surface was formed by protruding from the surface of a standard ceramic piece, but an uneven surface may be formed by placing a ceramic piece shorter than the surface of the standard ceramic piece. A combination of both is also possible. Furthermore, it goes without saying that the shape and number of ceramic ink pieces for forming the uneven surface are not limited to those of the above embodiments.

〔effect〕

As explained above, according to the wear-resistant blower according to the present invention, the flow velocity of the gas containing dust is weakened at the corner portions of the liner, so if there is a gap in the ceramics at the corner portions, dust may enter. Even so, wear on the liner surface due to dust is less likely to occur,
We were able to further improve the durability of the liner.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a liner attachment part showing an embodiment of a wear-resistant blower according to the present invention, Fig. 2 is a perspective view of the main part of Fig. 1, and Figs. 3 to 6 show examples of ceramic pieces. 7 is a front view of the blower impeller, FIG. 8 is a vertical cross-sectional view of FIG. 7, and FIG. 9 is a cross-sectional view of a liner mounting portion in a conventional example. 1... Impeller 2... Vane plate 7.20... Liner 13.21... Ceramics 22... Bottom wall part 23... Left side wall part (side wall part) 24... Right side wall Part (side wall part) 25.26... Corner part Patent applicant Sumitomo Cement Co., Ltd. Figure 1 Figure Figure Figure

Claims (1)

[Claims] A wear-resistant blower in which a liner whose surface is coated and protected with ceramics is attached to each vane plate provided on the impeller, the liner having a bottom wall portion and a side wall portion. , a wear-resistant blower characterized in that at the corner portions of both wall portions, an uneven surface is formed on the ceramic surface along the gas flow direction.