JPS59110994A - Controller for fluid flow in duct - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluid flow control device in a pipe, which is capable of not only controlling the flow rate of a liquid flow in a pipe, but also dividing and extracting powder and granules in a liquid flow. The feature is that it also makes it possible to control the following.

For example, the flow rate of fluid flowing through a conduit can be appropriately controlled by providing the conduit with a restrictor or other device that provides flow resistance, or by making the capacity of a pump variable. However, when the fluid flowing through a pipe contains powder or granules, if a part of the powder or granules is to be extracted separately or separated and extracted based on specific gravity, the means for collecting the powder is the pipe. It is necessary to attach it to

By setting appropriate conditions, the present invention not only allows wide-ranging control of the flow rate of the liquid flow in the above-mentioned pipes, but also allows for a wide range of fluid flow, such as divided extraction according to an arbitrary ratio of powder and granules, and separation extraction according to specific gravity. The present invention aims to provide a control device with an extremely simple configuration that can control the following.

Such fluid flow control devices are used to remove sediments from rivers, dams, etc., for example, in civil engineering and foundation construction, when separating earth and sand from excavation mud using muddy water construction methods, in which ground is excavated while circulating muddy water. In the case of fine-grained coal in the mining industry,
When carrying out specific gravity separation of metal minerals, removing impurities from pipelines in the chemical industry, dividing the flow, adding other substances, separating true specific gravity liquids, etc., and waste treatment in urban areas, etc. It can be effectively used for removing high specific gravity substances when carrying out.

Accordingly, the fluid flow control device of the present invention connects a main pipe through which a liquid to be controlled flows and a sub pipe through which a circulating liquid flow flows so that their axes are parallel and both liquids flow in the same direction. ,
At the junction, a communication hole is bored between the two pipes to form a liquid contact area between the two pipes, and at this liquid contact area, gravity and centrifugal force act from the main pipe side to the sub pipe side. It is characterized by the following structure.

Embodiments of the present invention will be described below with reference to the drawings.

The first embodiment shown in FIGS. 1 and 2 shows a straight pipe type fluid flow control device, which includes a main pipe 1 through which the liquid to be controlled flows at a constant flow rate, and a pump 3 etc. to flow the circulating liquid flow. Sub pipe 2
and the opposing sides of both (two openings 4 and 5 are provided, and a partition plate 6 is interposed between these openings 4 and 5 so that both axes are parallel and the liquids of both flow in the same direction. At this joint, both pipes 1 and 2 are connected to the partition plate 6.
One or more communication holes 7 are formed to form a contact area for the liquid, but the shape and size of the communication holes,
The selection should be made according to the purpose of controlling the liquid flow, and if necessary, prepare a large number of partition plates with communicating holes of various shapes and sizes, and divide them according to the properties of the liquid flow. You can use them accordingly.

The main pipe 1 and the sub-pipe 2 are arranged such that the main pipe 1 is arranged above and the sub-pipe 2 is arranged below at the liquid contact part, so that gravity acts from the main pipe side to the sub-pipe side. There is.

In a fluid flow control device having such a configuration, while water or other liquid is allowed to flow through the main pipe 1 at a constant flow rate, water or other circulating liquid is caused to flow through the sub pipe 2 by the pump 3, and both pipes 1,
When both liquids are brought into contact at the contact portion 2, the flow rate on the outflow side in the main pipe 1 can be increased or decreased steplessly in accordance with the □ flow rate of the circulating liquid flow. In this case, if the liquid in the main pipe 1 and the sub pipe 2 are not the same, a part of the liquid in the main pipe 1 is divided into the sub pipe 2, or the liquid in the sub pipe 2 is transferred to the main pipe 2.
If a mixture of two or more liquids is flowing in the main pipe 1, the one with higher specific gravity will be separated and extracted into the sub pipe.

Furthermore, when a slurry containing powder or granules is flowing through the main pipe 1, the flow rate of the liquid on the outflow side of the main pipe 1 can be controlled by flowing the circulating liquid flow through the sub pipe 2, and at the same time, the powder or granules can be controlled. By dividing and extracting a part of the powder into the sub-tube 2, it is possible to separate the powder and granules based on their specific gravity.

The second embodiment shown in FIGS. 6 and 4 shows a spiral type control device, which includes a main pipe 11 through which the liquid to be controlled flows at a constant flow rate, and an auxiliary pipe through which a circulating liquid flow is caused by a pump (not shown) or the like. 12, these two pipes are joined with the main pipe 11 inside and then wound in a spiral shape, and an appropriate number of communication holes 17 are bored between the main pipe 11 and the sub pipe 12 at appropriate places on this spiral pipe. are doing. In this spiral type fluid flow control device, liquid is caused to flow in the same direction through the main pipe 11 and the sub pipe 12, and the two liquids are brought into contact at a contact portion provided with a communication hole 17. Since the pipe is located in the main pipe side, centrifugal force acts from the main pipe side to the sub pipe side. Therefore, the spiral tube can also be used with an appropriate inclination. In addition, 18 in the figure is an inner fixing plate of the spiral tube.

In a fluid flow control device having such a configuration, when a liquid flows at a constant flow rate through the main pipe 11 and a circulating liquid flow flows through the sub pipe 12, centrifugal force acts on the liquid flowing through both spiral pipes. Since centrifugal force can be controlled by flow velocity,
It is particularly effective for specific gravity separation of powder and granular materials, and can improve the accuracy of O2 separation. In this case, the factors that govern the separation accuracy include the amount of powder supplied, the flow rate in the pipe (flow velocity), the inclination angle of the device, the position, size, and shape of the communication hole, etc.
It is desirable to set these appropriately as well.

Note that, of course, in the case of the second embodiment, fluid flow can be controlled over a wide range as in the case of the first embodiment.

Experimental examples using the above apparatus will be explained below.

Embodiment In the straight pipe type device shown in Figs. 1 and 2, the length 1
Flow rate 2 in the horizontal main pipe with a diameter of 20Qmm and a diameter of 20mWφ
For the water flowing at ゜'/mLn, the circulating water flow flowing in the same direction in the circulation Takigawa subpipe is %15'/m1fL to 4
The contact was made by changing the flow rate every 1 man 5' up to 5'/min.

The communication hole that forms the fluid contact area in both pipes has a width of 10
mm, length 10, 20, 30, 50, 70.100mm
The flow rate on the outflow side of the horizontal main pipe was measured for each of six different types.

As a result, even if the flow rate of water flowing into the horizontal main pipe is constant,
By increasing the flow rate of the circulating water flow, the flow rate on the outflow side of the main pipe can be increased, and it can also be applied to the main pipe and the sub pipe, and it has been confirmed that control to obtain the desired flow rate on the outflow side is possible within this range. did it.

Example: Coal having a particle size of 14 to 48 mesh and a specific gravity of 1.3 to 1.5, and cleaned waste rock of the same particle size and specific gravity of 1.6 to 2.2,
Using a powder sample mixed at a weight ratio of % and waste stone addition%,
A slurry having a solid weight of 10% based on water was prepared and passed through the main pipe under the same experimental conditions as described above, and the divided inflow ratio of the powder into the sub pipe and the state of separation of the solids based on specific gravity were measured.

As a result, assuming that the amount of water that passes through the main pipe and is obtained on the outflow side is approximately the same as that on the inflow side, under the above conditions, the flow rate of the circulating water flow and the area of contact between the water flows in both pipes are selected appropriately. It was recognized that by determining the powder weight on the outflow side of the main pipe, it was possible to arbitrarily determine the weight of the powder particles in the range of 95% to 70%.

In this case, as the flow rate of the circulating water stream increases, the weight of the powder particles guided to the outflow side of the main pipe increases, and it goes without saying that the particles can be allowed to flow in even more.

In addition, under several different conditions, the flow rate of the circulating water flow and the contact area were selected so that the weight of the powder particles passed through the horizontal main pipe and obtained on the outflow side was 3% (20% on the circulating water flow side). The above flow rate is 32 kale and the contact length is 5Q.
In the case of in, waste rock accounted for 12% (coal 8%) of the solid weight (20%) on the circulating water side, and the best separation result was obtained. This is 60% of the waste rock that passes through the main pipe.
This corresponds to

Embodiment The spiral type device shown in FIGS. 3 and 4 was
A main pipe and a sub pipe of 0 mmφ are joined, and the inner diameter of the main pipe is 250 mm with the main pipe inside, and the winding interval is 5Q 771
7) Construct by winding 15 times in a spiral shape with L,
For each turn of this spiral tube, one communication hole with a diameter of 3 mm was provided between the main tube and the sub tube to form a fluid contact portion.

The slurry sample with lO% concentration used in Experimental Example 2 was
By flowing water into the main pipe under the same conditions as above and passing circulating water through the sub pipe, results showing basically the same tendency as in Experimental Examples 1 and 2 were obtained, but the equipment was rotated at 45°. In the real number results obtained by tilting, in the best case, 9 of the total amount of waste rock is
0% could be recovered.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a first embodiment of the present invention, FIG. 2 is an exploded perspective view of the main parts thereof, and FIG. 6 is a plan view of a second embodiment of the present invention.
FIG. 4 is a partially cutaway front view thereof. 1.11--Main pipe, 2.12@...Sub-pipe, 7,
F.0 communication hole. first intestine

Claims (1)

[Claims] 1. Connect the main pipe that flows the liquid to be controlled and the sub pipe that flows the circulating liquid flow so that their axes are parallel and both liquids flow in the same direction, and create communication between the two pipes at the joint. A fluid in a conduit characterized in that a hole is formed to form a liquid contacting part of both pipes, and gravity or centrifugal force acts from the main pipe side to the sub-pipe side at this liquid contacting part. flow control device.