JPS637319Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a circular scale pit that separates scale from a liquid containing suspended matter such as scale by a swirling flow. This invention relates to a circular scale pit with an extinguishing structure.

Liquids such as cooling water used in large quantities in the steelmaking process contain many suspended substances such as scale and oil, so it is necessary to separate the scale and oil from these liquids and reuse them or treat them as wastewater. are doing. A circular scale pit is used as a means for separating and removing these suspended substances (hereinafter collectively referred to as scale).

The structure of the circular scale pit is that a flow path for suspended water is provided at the top of an inner cylinder that is vertically installed within the outer cylinder main body, and the flow path is a straight flow path that engages a discharge port in the tangential direction of the inner wall surface of the inner cylinder. The suspended water discharged from the flow path into the inner cylinder becomes a swirling flow along the inner cylinder wall and flows downward, at which time scale is separated by centrifugal separation. . The separated scale is deposited at the bottom of the scale pit under the inner cylinder, and at a suitable time, a bucket suspended from the upper part of the inner cylinder is lowered to the bottom, picked up and lifted up, and removed to the outside. However, in conventional equipment, swirling flow occurs continuously even when the bucket is suspended and lifted, so the bucket rotates due to the influence of this swirling flow, making it difficult to operate the bucket. It was hot.

The purpose of the present invention is to provide a structure that can eliminate the constantly occurring swirling flow at a desired time, thereby improving the efficiency of bucket operation.

In this invention, an annular water conduit is provided around the inner cylinder, and this water conduit is detoured only when it is desired to eliminate swirling flow, thereby suppressing the force of inflowing water and preventing swirling flow from occurring. It is characterized by its structure.

As shown in FIGS. 1 and 2, the circular scale pit of the present invention has an inner tube 2 erected at the center of a main body 1, and a main introduction path that engages from a tangential direction toward the inner wall surface of the inner tube. 3 is provided. The lower region of the inner cylinder 2 is a scale accumulation part, and 21 is an accumulation scale. A bucket 4 is suspended from the upper part of the inner cylinder 2 by a wire 41, and by operating the wire, the bucket is lowered, grabs a scale, and then is pulled up to the outside of the inner cylinder. The cleaned fluid after scale separation passes through the space 32 between the inner cylinder 2 and the outer cylinder 31, overflows into the space (pump pit) 33 between the outer cylinder 31 and the main body 1, and is discharged out of the apparatus by the pump 34 and piping 35.

In addition to this basic configuration, an annular water conduit 5 is provided at approximately the same level as the main water conduit 3 so as to surround the inner cylinder. This annular headrace is connected to the main waterway 3 in a branched manner, but as shown in FIG. Therefore, under normal conditions, water flow 7 (second flow) flowing through the main channel
(Fig.) has become such that almost no water flows into it.

Between the annular water conduit 5 and the inner cylinder 2, a plurality of water troughs 51 are provided at approximately equal intervals in the circumferential direction to communicate the two, and each trough produces a small amount of water flow 8 without flow force. (Fig. 2) can flow into the inner cylinder.

A gate valve 6 is provided in the outlet end area of the main introduction path 3.
is provided. As shown in FIG. 3, this gate valve 6 is a valve that can be raised and lowered by the rotational operation of a motor 61 etc. to open and close the waterway. It is designed so that the outflow port can be blocked.

Next, the operation of the device of the present invention will be explained. Under normal conditions, the gate valve 6 is open, and the suspended water flows forcefully into the inner cylinder 2 from the main water channel 3 as shown by arrow A, forming a swirling flow 7, and the centrifugal separation action continues. be exposed. Eventually, the separated scale is deposited on the bottom and when it reaches the point where it needs to be discharged to the outside, the gate valve 6 is closed. As a result, the suspended water flowing into the main introduction channel 3 is detoured to the branched annular water conduit 5, the flow force is suppressed, and the water flows from the plurality of outflow troughs 51 into the inner cylinder 2 as shown by the broken line in FIG. Water stream 8 flows in little by little.

When the water flows in from the outflow trough, there are no factors that cause swirling flow in terms of water volume, water force, and inflow direction, so the water flow 8 simply flows down inside the inner cylinder, and the swirling flow disappears. . Therefore, even when suspending or lifting the bucket 4, the bucket can be operated quickly without any rotation or vibration caused by the swirling flow.

After the accumulated scale in the bucket is discharged, the gate valve 6 is opened and the suspended water is introduced directly into the inner cylinder from the main channel 3 again to generate a swirling flow and perform scale separation.

According to the circular scale pit of the present invention, since the swirling flow can be extinguished at a desired time, bucket operation for removing scale is extremely easy. In this apparatus, the separation work and the scale removal work are completely distinguished, but the scale removal work time is extremely short and can be carried out efficiently, so that the work efficiency of the separation work as a whole is improved.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a circular scale pit according to the present invention. FIG. 2 is a horizontal sectional view taken along the - line in FIG. 1. FIG. 3 is a perspective view showing an example of a gate valve. Description of symbols, 1...Main body, 2...Inner cylinder, 3...Main introduction channel, 4...Bucket, 5...Annular headrace, 6
...gate valve.

Claims (1)

[Scope of utility model registration request] A vertically erected inner cylinder is provided with a main channel that communicates linearly from the side, and suspended water is introduced from the main introduction channel and flows down while creating a swirling flow inside the inner cylinder to remove the water contained in the suspended water. In a circular scale pit with a structure in which the scale is separated, deposited at the bottom of the inner cylinder, and removed from a bucket, an annular water conduit is provided around the inner cylinder and communicates with the main introduction channel with a step. A large number of flowing water troughs are provided that communicate with the inner cylinder, and a gate valve that can be selectively opened and closed is provided at the inlet of the main introduction path to the inner cylinder, and when the gate valve is open, the main flow of suspended water is A swirling flow is generated by flowing into the inner cylinder from the introduction channel, but when the gate valve is closed, the swirling flow disappears as the suspended water bypasses the trough of the annular water conduit and flows into the inner cylinder. A circular scale pit characterized by its structure.