JPS5925490Y2 - Automatic slurry supply device for vertical centrifuges - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an automatic slurry supply device for a vertical centrifuge.

Generally speaking, a centrifugal separator uses centrifugal force to press the solids in the slurry supplied into the bowl through a supply pipe against the inner wall of the bowl, and then move the solids to the discharge port at the small end of the bowl using a screw conveyor. This is a separator that discharges liquid from the drain port at the end.

FIG. 1 shows a longitudinal cross-sectional view of a conventional vertical centrifuge, and numeral 1 in the figure is the main body of the vertical centrifuge.

The rotating part of this centrifugal separator consists of a bowl 2, a screw conveyor 3 that rotates with a slight rotational difference inside the bowl 2, and a gear unit 4, which is held in the main body 1 by a bearing 5. There is.

The shape of the bowl 2 is a composite shape of a cone and a cylinder, and a solid content discharge lower is provided in the bowl head 6 on the small end of the conical portion, and a drain port 8 is provided on the bowl head on the large end of the cylindrical portion.

The screw conveyor 3 has a structure in which a blade is spirally wound around the outside of a bubble, and trunnions 9 and 10 are attached to both ends, one of which is connected to the gear unit 4 by a spline, and the other trunnion is connected to the gear unit 4 by a spline. 10 is hollow so that a feed pipe 11 can be inserted therein.

The feed pipe tube 11 extends through the trunnion 10 into the tube to the slurry feed chamber.

The slurry supplied from the feed pipe 11 through the slurry supply port 12 is once accelerated within the hub, fed into the bowl 2, and is pressed against the inner wall of the bowl 2 by centrifugal force. The solids flow through the spiral waterway toward the drain port 8, and the solids are sent to the small end of the bowl by the screw conveyor 3, and are continuously discharged outside the machine from the solids discharge lower.

Further, the feed pipe 11 has a double pipe structure, and the cleaning liquid sent from the cleaning liquid pipe 13 flows outside the feed pipe 11 and is fed into the bubble.

In the figure, 14 indicates the liquid discharge direction, 15 indicates the liquid discharge port, 16 indicates the gas discharge port, and 17 indicates the solid content discharge direction. 16 to the outside of the machine to equalize the process pressure.

Furthermore, since the centrifugal separator shown in Fig. 1 is vertical, when the supply amount of slurry changes and is small, the slurry does not reach the feed port provided inside the bubble, and the slurry flows through the gap between the feed pipe 11 and the feed port. There is a drawback that the solids flow down along the feed pipe 11 and mix with the solids discharged from the solids discharge lower.

Even if the amount of slurry supplied decreases when the centrifuge starts operating, stops operating, or for some other reason, the slurry supplied from the feed pipe 11 or the gap between the feed pipe 11 and the feed port In order to prevent the slurry from flowing down along the feed pipe 11, the speed of the supplied slurry may be kept constant.

That is, if the slurry speed is constant, the valve 18 is provided at the tip of the feed pipe 11 as shown in FIGS. 5 and 6, and when the slurry 19 is supplied in a large amount as shown in FIG. As shown in FIG. 6, when the supply amount of slurry 19 is small, the opening of the valve 18 is made small to prevent the slurry 19 from flowing down from the gap between the feed pipe 11 and the feed port 20 along the feed pipe. It becomes possible to

This invention has an automatic slurry supply adjustment device installed at the tip of the feed pipe, so that even if the slurry supply amount changes, the slurry is always delivered at a constant speed from the tip of the feed pipe to the inner wall of the screw conveyor or the feed port. An object of the present invention is to provide an automatic slurry supply device for a vertical centrifuge that can supply slurry to the top of a vertical centrifuge.

That is, the present invention provides a centrifugal separator that separates solids in slurry supplied from a feed pipe from liquid by centrifugal force. An automatic slurry supply adjustment device comprising: a cylindrical valve; a valve seat disposed within the valve for opening and closing the tip of the feed pipe; and a spring urging the seat to come into contact with the tip of the feed pipe. The present invention relates to an automatic slurry supply device for a vertical centrifugal separator, which is characterized by being provided with.

An embodiment of the present invention will be explained below with reference to the drawings. Fig. 2 shows an embodiment of the slurry supply automatic adjustment device 21 of the invention, and it is attached to the tip of the feed pipe 11 of a vertical centrifuge as shown in Fig. 1. It shall be established.

In the case of the embodiment shown in FIG. 2, this slurry supply automatic adjustment device 21 includes a valve 24 that is screwed into a screw 22 cut on the outer periphery of the tip of the feed pipe 11, and has a large number of openings 23 on the side surface, and a feed valve 24. A valve seat 25 is attached to and removed from the tip of the pipe 11 to open and close the tip of the pipe, and a valve seat 25 is stretched between the top surface of the valve seat 25 and the inner end wall of the valve 24, and the valve seat 25 is attached to the tip of the feed pipe 11. It is composed of a coil spring 26 which is biased so as to come into contact with each other.

Further, a guide rod 27 is vertically provided in the center of the upper surface of the valve seat 25 and projects outward from the hole 24 a in the center of the valve 24 .

Next, the action will be explained.

The state shown in Figure 2 is the assembled state, but the feed vibe 1
When the slurry 19 is supplied into the valve seat 25 as shown by the arrow, the slurry 19 pushes against the coil spring 26 and pushes the valve seat 25 against the coil spring 26.
It is pushed up as shown in the figure, and is supplied from the gap 28 between the feed pipe 11 and the valve seat 25, through the opening 23 of the valve 24, and onto the feed port.

In addition, the valve seat 25
Since the force pressing on the coil spring 26 changes, the force compressing the coil spring 26 also changes proportionately and thus the opening 23 of the valve 24 changes.
The opening area (length l) corresponding to the gap 28 changes proportionally, and the slurry 19 is supplied at a constant speed.

As explained in detail above, the present invention is constructed so that the flow energy of the slurry itself rising in the feed vibrator pushes up the valve seat against the biasing force of the spring, and the slurry is ejected from the opening of the valve. Since the slurry itself determines the opening degree of the valve and ejects it, when the supply of slurry is stopped, the valve is closed by the biasing force of the spring, and no dripping occurs on the outside of the valve.

As described above, in the present invention, the slurry supplied to the feed pipe can maintain a constant supply speed by itself.

That is, if the slurry supply amount: A cyyf per second, the gap between the feed pipe and the valve seat at that time: l Cm, the total width of the valve opening: W Cm, then the souffling speed υ at that time is the slurry supply amount per second as above. When it becomes X times, that is, XAcm3, the gap between the feed pipe and the valve seat at that time becomes lXXcm, so the velocity of the slurry at that time is vX, and the slurry always flows at a constant speed from the tip of the feed pipe into the centrifuge, i.e. Since it is supplied onto the inner wall of the screw conveyor or onto the feed port, it will not flow down along the feed pipe through the gap between the feed pipe and the feed port, and there will be no drawbacks such as incomplete separation.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view showing an example of a conventional vertical centrifuge;
Fig. 2 is a side sectional view of an automatic slurry supply device showing an embodiment of the present invention, Fig. 3 is a side sectional view showing a different operating state from Fig. 2, and Fig. 4 is a view taken in the direction of the X arrow in Fig. 3. , 5 and 6 are sectional views for explaining the principle of the present invention, respectively. Explanation of main parts of the figure 11...Feed pipe, 19...Slurry, 21...Slurry supply automatic adjustment device, 23...Opening, 24...・・・
... Valve, 25 ... Valve seat, 26.
...Coil spring.

Claims (1)

[Scope of utility model registration request] In a centrifugal separator that separates solids in slurry supplied from a feed pipe from liquid by centrifugal force, a cylindrical valve with a closed upper end and multiple openings on the side is installed at the tip of the feed pipe. and is arranged within the same valve,
a valve seat that opens and closes the tip of the feed pipe;
An automatic slurry supply device for a vertical centrifugal separator, comprising an automatic slurry supply adjustment device comprising a spring that urges the sheet to come into contact with the tip of a feed pipe.