JP2858980B2 - How to remove foreign matter from cyclone - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for separating contaminated sand and other substances by using a cyclone and, when the cyclone is clogged with foreign substances, to a method for removing the foreign substances by backwashing.

[0002]

2. Description of the Related Art Soil collected from a sewage treatment plant or the like contains particles having different particles and contains a large amount of organic substances. Since this sand cannot be directly dumped and used for landfill, it is necessary to separate the sand. There is a method of using a cyclone to separate this dirty sand. In this cyclone separation method, dirty sand is supplied together with the washing water from the tangential direction of the upper periphery, a large part of the separated weight is taken out from the lower part, and light substances such as the wastewater and organic substances after washing are discharged from the upper part of the cyclone It is supposed to be.

[0003]

If the cyclone is used to separate the dirt and sand, the cyclone may be clogged without separating and discharging the organic substances and the large trash in the dirt. Conventionally, when such clogging occurs, the cyclone is decomposed to remove foreign matter. Therefore, there is a disadvantage that it takes time and effort to remove the foreign matter, and the separation operation for removing the foreign matter is temporarily interrupted.

According to the present invention, when clogging occurs in a cyclone, the direction of washing water supplied to the cyclone is switched,
It is an object of the present invention to remove the clogged foreign matter together with the washing water and remove it with a screen installed outside the cyclone, thereby easily removing the cyclone foreign matter.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object. A backwash passage is provided in a cyclone, and backwashing is performed by switching a valve to flow back washing water. The gist is that the clogged foreign matter is caused to flow out of the cyclone through a drain pipe, and the foreign matter is removed by a screen provided in a bypass passage.

[0006]

[Function] When clogging occurs in the cyclone during the separation of dirty sand, the supply of washing water to the cyclone is switched from the upper part to the lower part of the cyclone, and the foreign matter that caused the clogging in the cyclone is removed by this washing water for back washing. Discharged from sewage outlet from cyclone. At this time, the sewage flow path from the cyclone is also switched to guide the backwash sewage to the screen, where foreign matter is removed. As a result, foreign substances can be easily removed without decomposing the cyclone, and the sewage from the backwashing is removed by the screen, so that even if returned to the sand basin, the wastewater is not circulated and clogged again.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the illustrated embodiment. In the figure, reference numeral 1 denotes a cyclone having a required capacity, and a supply pipe for supplying washing water together with the contaminated sand is connected to the outer periphery of the upper part of the cyclone, and the contaminated sand and the cleaning water are supplied tangentially to the upper part inside the cyclone. A swirling flow is generated inside. A sand discharge pipe 3 for discharging sand separated by natural gravity is connected to a lower portion of the cyclone 1, and valves 2A and 3A are provided at the tip of the sand discharge pipe 3 and the supply pipe 2, that is, near the cyclone. A bypass pipe 4 is connected between the upstream side of the valve 2A of the supply pipe 2 and the upstream side of the valve 3A of the sand discharge pipe 3.
, And a valve 4A is arranged in the bypass pipe 4, preferably near the sand discharge pipe.

A drain pipe 5 is connected to the upper part of the cyclone 1 for draining dirty sand and sewage after washing. The drain pipe 5 is connected to an upstream side and a downstream side of a valve 5A. The bypass passage 6 is connected, and a valve 6 is connected to the bypass passage 6.
A and a screen 7 for removing foreign matter in sewage are provided.

When the contaminated sand collected from a sewage treatment plant, a sand basin, or the like is supplied into the cyclone 1 through the supply pipe 2 together with the washing water, sand and organic substances are separated due to the specific gravity difference due to the swirling flow in the cyclone. The heavy sand falls in the cyclone and is discharged from the sand discharge pipe 3, and the organic matter is discharged together with the sewage through the discharge pipe 5 above the cyclone. At this time,
Valves 2A, 3A, 5A are open and valves 4A and 6A are closed. When clogging occurs in the cyclone 1, the valves 2A, 3A and 5A are closed, and the valves 4A and 6A are opened. Then, the supply of the dirty sand may be stopped, and only the cleaning water may be supplied.
As in the conventional separation step, the sand and the washing water may be supplied simultaneously. As a result, the cleaning water is supplied from the lower part of the cyclone 1, and the foreign matter that has clogged in the cyclone flows back together with the cleaning water supplied from the opposite direction, and is directly discharged from the cyclone 1 through the cyclone 1. It is discharged outside. However, since the valve 5A is closed and the valve 6A on the side of the bypass passage is open, it flows down in the bypass passage 6. When passing through the screen 7, foreign matter in the sewage is captured and removed by the screen 7, and only the sewage is discharged through the discharge pipe. After the foreign matter is removed from the system by back washing the cyclone in this manner, the valve 2
A, 3A and 5A are opened and the valves 4A and 6A are closed to restart the conventional separation operation.

[0010]

According to the present invention, a backwashing passage is provided in the cyclone, the washing water is backflowed by switching the valve to backwash, and the clogged foreign matter flows out of the cyclone through the drain pipe. This is removed by the screen provided in the bypass passage, so that even if the cyclone is clogged, foreign matter can be easily removed simply by backwashing without disassembling the cyclone. By allowing the sewage from the washing to pass through the screen, foreign substances can be reliably removed from the system.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an embodiment for removing foreign matter from a cyclone of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cyclone 2 Supply pipe 2A valve 3 Sand discharge pipe 3A valve 4 Bypass pipe 4A valve 5 Drain pipe 5A valve 6 Bypass passage 6A valve 7 Screen

Claims (1)

(57) [Claims] 1. A back washing passage is provided in a cyclone, and washing water is back-flowed by switching a valve to back-wash, and clogged foreign matter is caused to flow out of the cyclone through a drain pipe and bypassed. A cyclone foreign matter removing device, wherein the foreign matter is removed by a screen disposed in a passage.