JPH0215568Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a discharge port bush for a centrifugal separator, and more specifically, the present invention relates to a discharge port bush for an inner barrel chamber in a screw decanter type centrifuge having a rotating outer barrel and an inner barrel. This invention relates to an improvement in the mounting structure of an attached outlet bush.

A screw decanter type centrifugal separator has a configuration as shown in FIG. That is, as shown in FIG. 1, there is an inner shell 2 that rotates concentrically inside a rotating outer shell 1, and screw blades 3 are provided on the outer periphery of the inner shell 2. The slurry supplied from the feed pipe 4 is supplied to the inner shell chamber 5, where it is accelerated and discharged into the outer shell 1 from the discharge port 6 of the inner shell chamber 5. Furthermore, here, due to centrifugal force, a solid substance 7 with a large specific gravity is
The structure is such that the solid matter 7 is scraped off by the screw blade 3 and discharged from the discharge port 10, and the liquid 8 flows out from the orifice 9.

In this way, the slurry supplied from the feed pipe 4 is accelerated by the rotating inner barrel chamber 5, so that depending on the type of slurry, the inner surface of the inner barrel chamber 5 is often worn out. Further, the discharge port 6 through which this slurry is discharged may be similarly worn.

As a countermeasure against this wear, the inner surface of the inner barrel chamber 5 has conventionally been overlaid with hardened overlay alloy, or lined with cemented carbide, ceramic, rubber, or the like. Similarly, the discharge port 6 is also filled with hardened alloy or has a replaceable bushing inserted therein.

FIG. 2 shows a bush 11 attached to the discharge port 6 of the inner barrel chamber 5, and a collar 12 prevents the bush from flying outward due to centrifugal force. Further, FIG. 3 shows a structure in which a bush 13 is attached to the discharge port 6 of the inner barrel chamber 5 with a bolt 14.

FIG. 4 is a cross-sectional view taken along the cutting line A-A in FIG. The part 16 is collided with, and this part is severely abraded. That is, the bush 11 is made of a wear-resistant material such as cemented carbide or ceramic.
You can replace it if it wears out, but the inner shell 2
cannot be easily replaced. In order to prevent this, when the bushing 11 is made to protrude inward from the inner surface of the inner barrel chamber 5 as shown in FIG. A portion of the inner surface of the chamber 5 designated by 18 will be worn out.

SUMMARY OF THE INVENTION An object of the present invention is to provide a discharge port bushing that can prevent wear of the discharge port portion of an inner barrel chamber in a screw decanter centrifugal separator.

For this reason, the configuration of the present invention is such that in a screw decanter type centrifugal separator, a discharge port bush with a uniform flange thickness attached to a discharge port of an inner barrel chamber, the bush when viewed from the rotational direction of the inner barrel chamber. The front portion of the flange of the bushing is retracted from the inner surface of the inner barrel chamber in the direction of increasing radius of the inner barrel chamber, and the rear portion of the flange of the bushing is not retracted from the inner surface. It is characterized in that the rear portion is flush with the inner surface or protrudes inward.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 6 and 7.

FIG. 6 shows a first embodiment of the present invention corresponding to the above-mentioned FIG. 4, and FIG. 7 similarly shows a second embodiment of the present invention.

That is, in the case of FIG. 6, the discharge port bush 21 having a uniform flange thickness is mounted at a position offset by H in the rotational direction 24 of the inner barrel chamber 22 with respect to the axis 23 of the inner barrel chamber 22. ing. In the case of FIG. 7, a discharge port bush 21 having a uniform flange thickness is mounted at an angle α with respect to the axis 23. In other words, in both of FIGS. 6 and 7, the front portion 25 of the flange of the discharge port bushing 21 when viewed from the rotational direction 24 is located in the increasing radius direction of the inner barrel chamber 22 from the inner surface of the inner barrel chamber 22. It is retracted, and the rear portion 26 of the collar protrudes inward from the inner surface of the inner barrel chamber 22. Therefore, wear of the inner barrel chamber 22 is prevented.

In FIGS. 6 and 7, the rear portion 26 of the flange of the discharge port bush 21 projects inward from the inner surface of the inner barrel chamber 22, but this rear portion 26 is in contact with the inner surface of the inner barrel chamber 22. May we become one.

As described above, the present invention provides a discharge port bush attached to a discharge port of an inner barrel chamber in a screw decanter centrifuge, in which the front portion of the flange of the bushing as viewed from the rotational direction of the inner barrel chamber is Since it is retracted from the inner surface of the inner barrel chamber in the direction of increasing radius of the inner barrel chamber, abrasion of the inner surface of the inner barrel chamber corresponding to the front portion is prevented, and the rear portion of the flange of the bush is retracted from the inner barrel chamber. Since it is not retracted from the inner surface of the barrel chamber, wear on the inner surface of the inner barrel chamber corresponding to the rear portion is prevented. Moreover, the flange of the discharge port bushing does not have a special shape on its upper surface.
Since the flange has a simple shape with uniform thickness, it is extremely easy to manufacture and install in the inner body chamber, and the front part of the flange wears less than the rear part. Therefore, if the bush has worn out to some extent, it can be rotated and reused.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional front view showing the main parts of a screw decanter type centrifuge, Figure 2 is an enlarged cross-sectional front view showing an example of a conventional discharge port bushing mounting structure, and Figure 3 is another one. FIG. 4 is a cross-sectional side view taken along cutting line A-A in FIG. 2, and FIG. 5 is a cross-sectional side view of another example corresponding to FIG. 4. , FIG. 6 is a cross-sectional side view showing a first embodiment of the present invention, and FIG. 7 is a cross-sectional side view showing a second embodiment of the present invention. 21...Discharge bush, 22...Inner barrel chamber, 23
... Axis center, 24 ... Arrow indicating the direction of rotation, 25
...front part, 26...rear part.

Claims (1)

[Scope of utility model registration request] In a discharge port bush with a uniform flange thickness that is attached to the discharge port of an inner barrel chamber in a screw decanter type centrifuge, the front part of the flange of the bushing when viewed from the rotational direction of the inner barrel chamber is A discharge port bush for a centrifugal separator, characterized in that the bushing is retracted from the inner surface of the barrel chamber in an increasing radius of the inner barrel chamber, and a rear portion of the flange of the bush is not retracted from the inner surface.