JPS6129767B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for separating hot suction matter from a suction air flow path.

When separating the aspirate from the suction air flow path, the applicant has previously developed a device that separates the aspirate without breaking the negative pressure in the suction air flow path, including a negative pressure chamber that communicates with the suction device, and the negative pressure chamber. proposed a separation device consisting of a liquid tank that communicates with a vacuum chamber, and an impeller that is installed in a communication section between the liquid tank and a negative pressure chamber. In such a device, the communication portion is sealed with water in the liquid tank, and the water is prevented from flowing into the negative pressure chamber by the centrifugal action of the impeller, and the water is transferred from the negative pressure chamber to the liquid tank via the impeller. The aspirate is evacuated. However, when the above-mentioned separation device was applied to the separation of high-temperature suction materials, the following problems occurred in the water sealing effect. That is, the scum on the surface of the molten metal is sucked, water is injected onto the scum, the scum is cooled and solidified, and the scum and water are removed from the suction airflow containing the solidified scum, the injected water, and the steam generated from this water. In the case of separation, the above separation apparatus was used. However, since the scum reaches the impeller in a short period of time, the inside of the particles of the scum released into the liquid tank is red-hot, so during continuous operation, the water in the liquid tank reaches a high temperature of 90° to 95°C. When red-hot scum is discharged from the impeller in such high-temperature water, boiling occurs instantaneously near the impeller and a large amount of steam is generated. This steam causes the outlet of the impeller to operate in a gas atmosphere, resulting in insufficient water sealing ability and the high temperature water around the impeller flowing back into the negative pressure chamber along with bubbles and steam. Moreover, a large amount of steam is generated in the suction air flow path due to the contact between this backflowing water and the red-hot scum, and steam that exceeds the condensation capacity of the condenser flows into the pipe, thereby reducing the negative pressure. The ability to attract scum from the surface of the molten metal is weakened. In addition, since a large amount of steam is generated in the impeller blades, the scum does not fall through the communication section 4a, but accumulates in the negative pressure chamber 1 or flows to the suction device communication port 2, making it impossible to discharge the scum. Become.

The present invention prevents the deterioration of the liquid sealing effect of the negative pressure chamber due to boiling caused by the high-temperature suction as described above, by providing a liquid injection nozzle.

Hereinafter, an embodiment in which the present invention is applied to the separation of scum sucked from the surface of the molten metal will be described with reference to the drawings.

1 is a negative pressure chamber maintained in a negative pressure state, and includes a cylindrical side wall 1a, a funnel-shaped bottom wall 1b, and a side wall 1a.
It has an upper wall 1c that covers the. A suction device communication port 2, which is connected to a suction device such as a vacuum pump, is opened in the side wall 1a. A suction flow inlet 3 is provided in the upper wall 1c, and the suction flow inlet 3 communicates with a suction head which is disposed opposite to the surface of the molten metal and which sucks scum and injects water onto the sucked scum. The bottom wall 1b is connected to a cylindrical discharge port 4, and the discharge port 4 opens below the liquid surface of the liquid tank 5.
A communication portion 4a between the negative pressure chamber 1 and the liquid tank 5 is formed. An impeller 6 is disposed in the communication portion 4a, and the impeller 6 is fixed to one end of a drive shaft 8 in a cylinder 7 that penetrates the side wall of the liquid tank 5, and is fixed to a pulley 9 at the other end of the drive shaft 8. It is rotationally driven by a drive device through it. The cylindrical body 7 is a support plate portion 10 on the side wall of the liquid tank 5.
The drive shaft 8 is fixed to the cylindrical body 7 via a bearing 11.
is rotatably supported. Cylindrical body 7 of drive shaft 8
An annular watertight wall 12 fixed to the support plate portion 10 is fitted onto the protruding portion from the support plate portion 10 , and a sealing material 13 is interposed between the watertight wall 12 and the drive shaft 8 . The impeller 6 includes a bottom plate 14 screwed onto a threaded portion 8a at one end of the drive shaft 8, an annular upper plate 15 disposed opposite to the bottom plate 14 and externally fitted into the discharge port 4, and a bottom plate 14.
and a vane plate 16 arranged radially between the upper plate 15 and the upper plate 15
Consisting of A sealing material 17 such as a labyrinth is interposed between the inner peripheral edge of the upper plate 15 and the discharge port 4. Annular chambers 20 and 21 are provided above and below the impeller 6 and adjacent to the impeller 6 to form annular nozzles 18 and 19. The upper annular chamber 20 is formed by a wall 22 with an L-shaped cross section fixed to the outer periphery of the discharge port 4 and the upper plate 15 of the impeller 6, and the nozzle 18 is formed between the outer periphery of the upper plate 15 and the wall 22.
It is formed by the lower edge of. Lower annular chamber 21
is the wall body 2 fixed to the support plate part 10 of the liquid tank 5
3, the bottom plate 14 of the impeller 6, and the watertight wall 12, and the nozzle 19 is formed between the outer peripheral edge of the bottom plate 14 and the upper edge of the wall body 23. Both the annular chambers 20 and 21 are connected to a distribution pipe 24 provided annularly around the outer periphery of the discharge port 4 via connection pipes 25 at appropriate intervals in the circumferential direction.
0 and 21, water is supplied from a water supply device 26 via a distribution pipe 24.

Next, the effect will be explained. A suction airflow containing scum, water, and steam flows from the suction flow inlet 3 to the negative pressure chamber 1.
When flowing into the suction device, the suction airflow is decelerated due to the increase in the cross section of the flow path, so that only water vapor and air with light specific gravity are suctioned into the suction device communication port 2. Scum and water are separated from the suction air stream at the outlet section 4
The fallen scum and water are discharged into the liquid tank 5 through the impeller 6 without breaking the negative pressure in the negative pressure chamber 1 due to the centrifugal action of the impeller 6. In this way, scum and water are separated and discharged from the suction air stream. By the way, the scum discharged from the impeller 6 is in a red-hot state, and when discharged into the liquid tank 5, it boils the water in the liquid tank 5. However, water is ejected at high speed from the nozzles 18 and 19 on the upper and lower sides of the impeller 6 at all times or at appropriate times. The components are transported away from the impeller 6. At the same time, the water flow prevents bubbles and steam generated above and below the impeller 6 from approaching the impeller 6. Therefore, the area around the outlet of the impeller 6 does not rotate in a gas atmosphere due to boiling, creating a centrifugal water seal that overcomes the negative pressure inside the impeller, and water, bubbles, water vapor, etc. are removed from the impeller 6.
This prevents the liquid from flowing back into the negative pressure chamber 1. Therefore, there is no problem of inadvertent boiling occurring in the negative pressure chamber 1 and lowering the suction force, and no backflow of scum occurs. If water at a lower temperature than the water in the liquid tank 5 is used for the water spouted from the nozzles 18 and 19, boiling around the impeller 6 is alleviated, which further improves the water sealing effect of the negative pressure chamber 1. do. As such low-temperature water, it is effective to use, for example, water produced in a double water device disposed between the suction device connection port 2 and the suction device.

In the above embodiment, the nozzles 18 and 19 were provided adjacent to the impeller 6, but the nozzles 18 and 19
The position may be in the vicinity of the impeller 6. Further, the nozzles 18 and 19 may be provided at appropriate intervals in the circumferential direction of the impeller 6 instead of being formed in an annular shape as described above.

As explained above, according to the present invention, since the nozzle that injects the liquid in the direction away from the impeller is provided near the impeller, even if the nozzle is used for separating and discharging hot aspirated materials such as red-hot materials, the aspirated materials can be Bubbles and steam generated by boiling due to heat are carried away from the area around the impeller, so there is no backflow of water or steam to the negative pressure chamber, and a drop in negative pressure in the negative pressure chamber can be prevented. .

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, with FIG. 1 being a sectional view of a separation device, and FIG. 2 being an enlarged sectional view of the same portion. 1... Negative pressure chamber, 2... Suction device communication port, 3...
Suction flow inlet, 4...Discharge port part, 4a...Communication part, 5...Liquid tank, 6...Impeller, 8...Drive shaft, 18, 19...Nozzle, 20, 21...Annular chamber.

Claims (1)

[Claims] 1. A negative pressure chamber that communicates with the suction device, a liquid tank that communicates with the negative pressure chamber, an impeller that is provided in the communication section between the liquid tank and the negative pressure chamber, and an impeller that is arranged near the impeller and moves away from the impeller. A separation device equipped with a nozzle that injects liquid in a direction.