JPS6231139Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a screw for a centrifuge, and more specifically, it is a screw decanter type centrifuge having a large number of tiles made of cemented carbide that are directly welded to the screw blades. This relates to improvements to the body screw.

As shown in FIGS. 1 and 2, the conventional inner screw of this type has a fan-shaped tile a made of cemented carbide, and its root portion b and tip portion c are connected to the inner screw blade. It was welded to d. For this reason, the screw wears mainly from the tip c of the tile a, but if the wear progresses to the tip bead e, the tile a will fall off, so the tile a will wear out from the tip bead e. It can only be used up to the front. In addition, since the root part b and the tip part c are welded to the inner body screw blade d, the welding process is not only two steps, but also the root part of tile a For b, the surface of tile a is not visible and welded (see root bead f)
However, for the tip part c, the back side of the tile a must be welded while the back side of the tile a is not visible (see tip bead part e), so the welding process is a two-step process involving inverting the screw inner body, which complicates the welding work. There were some shortcomings.

The present invention is a centrifuge screw that can be used effectively until the entire tip of a cemented carbide tile is worn out, can be welded in one step, and can reduce the weight of the tile. The purpose is to provide the following.

For this reason, the configuration of the present invention is such that in the inner screw of a screw decanter type centrifugal separator, which has a large number of tiles made of cemented carbide directly welded to the screw blades, each tile has a battledore with a narrowed base. It is characterized by the fact that the gaps between the bases of adjacent tiles are filled with beads and welded together.

An embodiment of the present invention will be described below with reference to FIGS. 3 and 4.

In Figures 3 and 4, 1 is a cemented carbide tile, 2 is its base, 3 is the tip,
4 is an inner screw blade, and 5 is a bead portion.

That is, as shown in FIG. 3, the tile 1 has a battledore shape with the base 2 tapered.
The gaps between adjacent tiles 1 are filled with beads (see bead portions 5) and welded to the inner screw blades 4. As shown in FIG. 3, it is desirable that the width w of the welded portion be such that it can be welded in one bead.

In the screw for a centrifuge configured as shown in FIGS. 3 and 4, the welding part is shared with the adjacent tile, so there is no need to weld the tip 3, and therefore the tip of the tile 1 Even if the entire surface of the section 3 is worn out, it will not fall off from the inner shell screw blade 4, allowing effective use of the tile 1. In addition, the number of welded parts will be halved compared to the conventional tile a, and the inner shell will not fall off. The trouble of inverting and welding is also eliminated. Furthermore, since the tile 1 is shaped like a battledore, it weighs less than a conventional fan-shaped tile.

As mentioned above, in the present invention, each tile has a battledore shape with a narrow base, and the gap between the bases of adjacent tiles is filled with beads and welded to the inner screw blade. As mentioned in the example, the entire tip of the tile can be used effectively until it wears out, and since there is only one surface to be welded, it is extremely simple, requires less welding material, and reduces the weight of the tile. decrease, etc.
The effects of this invention are extremely large.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing an example of a conventional screw for a centrifuge, Fig. 2 is a sectional view taken along the cutting line A-A in Fig. 1, and Fig. 3 is an embodiment of the present invention. FIG. 4 is a sectional view taken along cutting line B--B in FIG. 3. 1...Tile, 2...Root part, 3...Tip part,
4...Inner body screw blade, 5...Bead portion.

Claims (1)

[Scope of utility model registration request] In the inner screw of a screw decanter centrifuge, which has a large number of tiles made of cemented carbide that are directly welded to the screw blades, each tile is shaped like a battledore with a narrow base, and the tiles are adjacent to each other. It is characterized by the gap at the base of the tile being filled with beads and welded.
Screw for centrifuge.