JPS6034884B2 - Dehydration equipment - Google Patents

Description

[Detailed description of the invention] The present invention relates to a novel dewatering device.

Specifically, we would like to provide a new and useful dewatering device that is suitable as a dewatering device for obtaining product sand by removing moisture from raw sand material immediately after collection, or for removing moisture from mud to facilitate transportation. That is. In the production of product sand, it is common to first separate the collected raw materials by floating and refining the mud using a washing and vertical sorting device, and then remove the water contained during the washing and vertical sorting from the remaining sand to obtain product sand. It is true.

Conventionally, a sealed tank connected to a dehydrated material storage tank and a vacuum pump is provided, the washed sand raw material is stored in the dehydrated material storage tank, and the inside of the sealed tank is made to have a negative pressure. The water was sucked out of the sand raw material and stored in a closed tank, and the water collected in the closed tank was discharged using a drainage pump system. However, with conventional devices like this, if the drain pump is operated during dewatering, the negative pressure in the closed tank will drop through the drain pump system, so when draining water, the vacuum must be turned off. The pump had to be stopped once and then the drain pump had to be started, making it impossible to perform continuous dewatering, which was extremely inefficient. Therefore, we prepared two sealed tank systems for each dehydrated material storage tank.
When one sealed tank becomes full, it switches to the other sealed tank system to perform dehydration, and then the other sealed tank is drained.By switching between the two systems, continuous dehydration operation can be achieved. It is possible to make it possible.

However, preparing two sealed tank systems in this way increases the cost extremely, and the control becomes complicated, which increases the frequency of failures. do not have.

Therefore, the present invention was devised in view of the above-mentioned drawbacks of conventional dewatering equipment, and provides a new and useful dewatering equipment that enables continuous dewatering operation without increasing installation costs. It is equipped with a sealed tank connected to a vacuum pump and a storage tank for dehydrated materials at the top, and a submersible pump installed near the bottom. The system is characterized in that a check valve is placed in the system for discharging water to the outside so as to block the flow of water to the submersible pump side.

The details of the dewatering apparatus of the present invention will be explained below according to illustrated embodiments. In the figure, 1 is a storage tank for dehydrated materials.

The dehydrated material storage tank 1 consists of a hemispherical concrete bottom body 2 and a cylindrical part 3 erected from the upper part of the bottom part 2, and between the upper part of the bottom part 2 and the lower end of the cylindrical part 3. is completely sealed. Inside the bottom body 2, rocks with a large diameter are arranged at the bottom, rocks 4 with diameters gradually decreasing toward the top, and sand 5 are stacked in the top layer. 6 is a sealed water tank.

The upper part of the water receiving tank 6 is connected to a dehydrated material storage tank 1 by a conduit 7.
The two bottom parts of the bottom body are connected through a lotus. 8 is a vacuum pump, and this pump 8 is connected to the upper part of the water receiving tank 6 through a conduit 9.

1. A submersible pump installed at the bottom of the river water receiving tank 6.
A drainage system path 11 extends from the submersible pump 10 to the outside.

In the middle of the drainage system path 11, there are two check valves 12a,
12b are provided at intervals and to block water flow toward the submersible pump 10 side. Further, a portion 11' of the drainage system path 11 between the check valves 12a and 12b is arranged substantially vertically, with at least the side of the check valve 12b being at a higher position. 13 is a pump;
Check valves 12a and 12b for the water supply tank 14 and the drainage system line 11
It is inserted in the middle of a conduit 15 that connects the portion 11' between the two.

The dewatering apparatus according to the present invention described above is operated as follows. Note that this operation will be explained based on the case where the dewatering apparatus of the present invention is used in a dewatering process for removing moisture from sand.

First, the washed sand raw material 16 still containing moisture is put into the cylindrical portion 3 of the dehydrated material storage tank 1, and then the vacuum pump 8 is driven. Then, the moisture in the sand raw material 16 flows from the interparticle gaps of the sand and rocks 4 layered in the bottom body 2 of the dehydrated material storage tank 1 → the conduit 7 → the space inside the water receiving tank 6 → the conduit 9 → the vacuum pump 8 The water 17 is then collected in the water receiving tank 6. On the other hand, the submersible pump 10 in the water receiving tank 6 is driven, and the water 17 accumulated in the water receiving tank 6 is discharged to the outside of the water receiving tank 6 via the drainage line 11.

At this time, since the check valves 12a and 12b act as a barrier on the side opposite to the submersible pump, the water in the water receiving tank 6 can be easily discharged.
By the way, as a result of drainage by the submersible pump 01, the water 17 in the water receiving tank 6 may decrease or disappear.

In such a case, the submersible pump 10 will be in a state close to idling, but there is a check valve 12 in the middle of the drainage system line 11.
a, 12b are provided, so through this path,
The degree of reduced pressure in the water receiving tank 6 is not impaired, and the dewatering ability of the vacuum pump 8 is not reduced. In particular, if the conduit on the outside from the check valve 12a is kept vertical or close to the vertical position, when the water in the water tank 6 runs out and the check valve 12a is closed, the check valve 12a can be closed immediately before The water that has passed collects in the outer portion of the check valve 12a (the portion 11' between the check valves 12a and 12b of the drainage line 11), contributing to increasing the degree of sealing in the check valve 12a. Moreover, such a degree of sealing is achieved when the check valve 12
By providing yet another check valve on the outside of a, water will surely stay in the portion 11' of the drainage system path 11, making it more reliable. Furthermore, if another pump 13 is provided to constantly supply water to the above-mentioned section of the drainage system path 11, the sealing at this section will be almost complete. As is clear from the above description, in the dewatering device of the present invention, a check valve is arranged in the system line for discharging the water in the water receiving tank to the outside so as to block the water flow toward the submersible pump side. Therefore, the degree of depressurization in the closed tank is not impaired through this drainage system, and therefore, both the vacuum pump and the submersible pump can be operated continuously, resulting in extremely good dewatering efficiency.

[Brief explanation of drawings]

The drawing is a system diagram showing an embodiment of the dewatering apparatus of the present invention. Explanation of symbols, 1...Dehydrated material storage tank, 6...
...Water tank, 8...Vacuum pump, 10.
... Submersible pump, 11 ... Drainage system line, 1
2a, 12b...Check valve, 13...Pump.

Claims (1)

[Claims] 1. A sealed tank connected to a vacuum pump and a storage tank for dehydrated material at the upper part, and a submersible pump installed near the bottom. A dewatering device characterized in that a check valve is arranged in a system line for discharging water to the outside so as to block water flow to a submersible pump side. 2. The dewatering device according to claim 1, characterized in that two check valves are arranged in the discharge system path so as to block water flow to the submersible pump side. 3. The dewatering device according to claim 2, wherein a line for supplying water via a suitable pump is connected to the line between the two check valves.