JPH0531404A - Suction type liquid-solid separator - Google Patents

Abstract

PURPOSE:To prevent abrasion of a pump without impairing the original performance of a centrifugal force type liquid-solid separator by providing this liquid- solid separator to the suction side of a pump. CONSTITUTION:The suction side of a pump 40 is connected to the outflow side of a liquid-solid separator 10. The discharge side of solid material in the liquid-solid separator is connected to the upper part of a storage tank 42 via a valve V1. The storage tank is provided with both a lower discharge port 48 having a valve V2 and an air vent pipe 50 having a valve 4. The interval between the discharge side of the pump and the storage tank is connected by a branched pipe 54 having a valve V3. The respective valves are controlled by a valve controlling device 56. While a suction type liquid-solid separator is ordinarily operated, the valve V1 is opened and the valves V2-V4 are closed. The valve V1 is closed and the valves V2-V4 are opened at a time for mode for discharging the stored material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suction type solid-liquid separation device in which a suction-side pump is combined with a solid-liquid separator utilizing centrifugal force. More specifically,
By combining these pumps and solid-liquid separators with a storage tank for discharging solids, a branch pipe, and multiple valves, a suction-type suction system is designed to have the effects of both maintaining the performance of the solid-liquid separators and protecting the pumps. The present invention relates to a solid-liquid separation system.

[0002]

2. Description of the Related Art A solid-liquid separator using centrifugal force has been publicly known, and there are several types such as a cyclone type.
Among them, there is a solid-liquid separator as shown in FIG. 3 as a typical device having excellent performance for separating solid particles contained in a liquid. This solid-liquid separator 10 includes outer barrels 14 and 16 at the upper and lower portions of a separation cylinder 12, respectively.
And an inlet port 18 on the side surface of the upper outer barrel 14,
Further, it is an external structure in which the outflow pipe 20 is arranged by penetrating the upper surface of the outer barrel 14 from above in the separation cylinder 12 to provide an outflow port 21, and a solid matter discharge port 22 is provided below the lower outer barrel 16. .

The internal structure and operating principle of this solid-liquid separator are as follows. Liquid and solid matter (solid particles and the like) flow into the upper chamber 24 in a tangential direction from the inflow port 18 to form a vortex. The liquid and solid matter are accelerated by passing through the slit-shaped special rotation mechanism 26 provided in the tangential direction, and are vigorously flown into the separation cylinder 12. The solid matter heavier than the liquid hits the inner wall of the separation cylinder 12 by centrifugal force, and the separation of the solid matter and the liquid (primary separation) starts. The solid matter slowly settles along the inner wall of the separation cylinder 12 and collects in the lower chamber 28. The liquid that has descended as a rotating vortex is suddenly decelerated by the lower guide vane mechanism 30, the velocity energy is changed to pressure energy, and further solid-liquid separation (secondary separation) is performed. The liquid that does not contain solids rapidly rises due to the central vortex (negative pressure zone), passes through the outflow pipe 20, and flows out from the outlet 21 to the outside. The solid matter accumulated in the lower chamber 28 is discharged from the solid matter discharge port 22 regularly or continuously as needed.

Conventionally, when a solid-liquid separator utilizing centrifugal force as described above is used, the liquid / liquid to be separated into the solid-liquid separator is
A pump for feeding solid matter is installed on the inflow side of the solid-liquid separator. That is, the discharge side of the pump and the inflow side of the solid-liquid separator are connected by piping. The stock solution (liquid containing solid matter) passes through a pump, is pressurized by the pump, is sent to a solid-liquid separator, and is purified there.

[0005]

When the pump is installed on the inflow side of the solid-liquid separator, the pump has a drawback that the liquid to be separated and the solid matter pass through the pump and the pump is easily worn and its life is shortened. Since the solid-liquid separator as described above separates the solid matter by utilizing the centrifugal force generated by the rotation of the liquid passing therethrough, whether the passage of the liquid is due to the pushing force from the inlet, Regardless of the suction force at the outlet, centrifugal force is exerted as long as a certain amount of liquid or more passes through, and performance is exhibited. Therefore, it is conceivable to intentionally install the solid-liquid separator on the suction side of the pump so that only the clean liquid separated from the solid matter is sucked in to protect the pump.

However, in the case of a solid-liquid separator utilizing centrifugal force, if the solid-liquid separator is simply installed on the suction side of the pump, when the solid material discharge port opens during operation, Air is sucked in, causing turbulence in the vortex inside the solid-liquid separator. Therefore, there arises a problem that the original performance of the solid-liquid separator cannot be exhibited. In order to solve this problem, the solid-liquid separation operation has to be interrupted once when the solid matter is discharged. However, this not only lowers the operation efficiency but also the separation performance when the operation is restarted.

The object of the present invention is to solve the above-mentioned drawbacks of the prior art and to install the solid-liquid separator on the suction side of the pump without impairing the original performance of the solid-liquid separator utilizing centrifugal force. In this way, the suction-type solid-liquid separation device in which the wear of the pump is prevented is provided.

[0008]

According to the present invention, a suction side of a pump is connected to an outflow side of a solid-liquid separator utilizing centrifugal force, and a solid matter discharge side of the solid-liquid separator is first opened and closed. It is connected to the upper part of the storage tank via a valve, and the storage tank is provided with a lower discharge port having a second on-off valve and an air vent pipe, and a third space is provided between the discharge side of the pump and the storage tank. It is a suction type solid-liquid separation device connected by a branch pipe having an on-off valve. Usually, the first, second, and third on-off valves are automatic on-off valves, and are equipped with a valve control device that controls each automatic on-off valve. The valve control device opens the first automatic opening / closing valve and closes the second and third automatic opening / closing valves during normal operation, and closes the first automatic opening / closing valve in the stored-material discharge mode, and closes the second and third automatic opening / closing valves. Control for opening the automatic on-off valve 3 is performed.

Further, particularly when the storage tank is large, a fourth automatic opening / closing valve is provided in the air vent pipe, and the valve control device controls the valve to be closed during normal operation and opened during the stored material discharge mode. Is preferred.

[0010]

[Function] During normal operation, the solid-liquid separator and the storage tank communicate with each other inside and are integrated, and the storage tank is isolated from the others and the inside is completely filled with liquid. Excellent solid-liquid separation performance. The separated solid matter settles in the storage tank. In the stored material discharge mode, the solid-liquid separator is completely separated from the storage tank by closing the first opening / closing valve, so that the solid-liquid separator alone can provide the original excellent solid-liquid separation performance. It exerts and accumulates the separated solids in the lower chamber. On the other hand, in the storage tank, the solid matter stored inside can be discharged regardless of the solid-liquid separator. After discharging, by connecting to the solid-liquid separator again with the inside completely filled with liquid, normal operation is resumed. Therefore, in the system of the present invention, the solid-liquid separator can continuously perform the solid-liquid separation operation during the normal operation and the solids discharge mode.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an overall explanatory view showing an embodiment of a suction type solid-liquid separation device according to the present invention. This device is mainly composed of a solid-liquid separator 10 utilizing centrifugal force, a pump 40 for circulating a liquid therein, a storage tank 42 for storing solid matter, and several automatic opening / closing valves. .

Here, the solid-liquid separator 10 has the same structure as that described in FIG. The outlet 21 of the solid-liquid separator 10 is connected to the suction side of the pump 40 by a main pipe 44. The solid matter discharge port 22 of the solid-liquid separator 10 is connected to the upper part of the storage tank 42 via a manual opening / closing valve 46 and a first automatic opening / closing valve V ₁ . A discharge port 48 provided with a _second automatic opening / closing valve V ₂ is provided in the lower portion of the storage tank 42, and an air vent pipe 50 is attached to the upper portion. A branch pipe 54 having a _third automatic opening / closing valve V ₃ is connected between the main pipe 52 on the discharge side of the pump 40 and the upper part of the storage tank 42. Further, a fourth automatic opening / closing valve V ₄ is installed in the air vent pipe 50. The automatic opening / closing valves V _{1 to} V ₄ are controlled to open / close by a signal from the valve control device 56.

Further, in this embodiment, a manual valve 58 for pressure adjustment is provided in the main pipe 52 on the discharge side of the pump 40,
Pressure gauges G are respectively provided on the inflow side and the outflow side of the solid-liquid separator 10 and before and after the manual valve 58 of the discharge side main pipe 52 of the pump 40.
_{1 to} G ₄ are installed.

Each automatic opening / closing valve V ₁ by the valve controller 56
The timing of the opening / closing operation of V ₄ is shown in FIG. During normal operation, the first automatic open / close valve V ₁ is open and the other automatic open / close valves V _{2 to} V ₄ are all closed. The stock solution (liquid containing solid matter) first enters the solid-liquid separator 10 by the suction force of the pump 40. In the solid-liquid separator 10, solid-liquid separation is performed according to the above-described operation principle, and the solid matter is settled and accumulated in the storage tank 42. The purified liquid is sucked into the pump 40 from the outlet 21 through the main pipe 44, and is discharged from the main pipe 52 on the discharge side.

When the solids are accumulated to some extent in the storage tank 42, the operation is switched to the storage discharge mode. First, the first automatic open / close valve V ₁ is closed to disconnect the solid-liquid separator 10 from the storage tank 42. Thereby, the solid-liquid separator 10 can continue the solid-liquid separation operation as it is. On the other hand, when the second automatic opening / closing valve V ₂ is opened, the solid matter accumulated in the storage tank 42 can be discharged. At that time, the third automatic opening / closing valve V ₃
Is opened, a part of the high-pressure clean liquid flows from the discharge side of the pump 40 into the storage tank 42 through the branch pipe 54, and the solid matter accumulated in the storage tank 42 is pushed out and stored. The tank 42 is cleaned. The back pressure of the liquid passing through the branch pipe 54 is adjusted by controlling the opening / closing degree of the manual valve 58. After cleaning, the second automatic opening / closing valve V ₂ is closed, and the fourth automatic opening / closing valve V ₄ of the air vent pipe 50 is opened. Since the third automatic opening / closing valve V ₃ is kept open, the clean liquid is stored in the storage tank 42.
Accumulate inside. When the liquid has accumulated until it is ejected to the outside through the air vent pipe 50, the fourth automatic opening / closing valve V ₄ is closed and the third automatic opening / closing valve V ₃ is closed. This completes the operation of discharging the solid matter.

After that, the first automatic on-off valve V ₁ is opened again,
All other automatic on-off valves V _{2 to} V ₄ are closed and the normal operation mode is returned to. At this time, the inside of the storage tank 42 is filled with liquid and air is not mixed in, so the separation performance of the solid-liquid separator is not impaired.

The valve control device 56 has a built-in timer and automatically executes the above sequence. Further, it is possible to automatically switch between the normal operation mode and the solid matter discharge operation mode. Needless to say, the operation mode can be switched as necessary by operating the manual switch.

The preferred embodiment of the present invention has been described above in detail, but the present invention is not limited to such a configuration. In the above-described embodiments, the automatic opening / closing valve is used in all, and opening / closing is controlled by the valve control device. This configuration is simple and preferable, but in some cases it may be performed manually. It is preferable to provide an opening / closing valve on the air vent pipe in order to prevent the entry of air, but especially in the case of a small-scale system, omission of the opening / closing valve does not cause much trouble. Further, the present invention is not limited to the solid-liquid separator as shown in FIG. 3, but can be applied to all types of solid-liquid separators utilizing centrifugal force.

[0019]

As described above, according to the present invention, since the solid-liquid separator is installed on the suction side of the pump as described above, the solid matter has already been separated and removed from the liquid flowing through the pump, and the wear of the pump can be prevented. It is possible to extend the life of the. And in the present invention, a storage tank is connected to the solid-liquid separator, and by devising such that air is not sucked into the solid-liquid separator by controlling several on-off valves, solid-liquid separation using centrifugal force is performed. The separation performance of the machine is not impaired. In the device of the present invention, since the solid-liquid separation operation can be continued even in the solid matter discharge mode, the operation efficiency is good.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a suction type solid-liquid separator according to the present invention.

FIG. 2 is an explanatory view showing opening / closing timings of the respective automatic opening / closing valves.

FIG. 3 is an explanatory view of the structure and operation of a typical example of a solid-liquid separator using centrifugal force.

[Explanation of symbols]

10 Solid-Liquid Separator 21 Outlet 22 Solid Discharge Port 40 Pump 42 Storage Tank 44 Main Pipe 48 Solid Discharge Port 50 Air Vent Pipe 54 Branch Pipe V ₁ First Automatic Open / Close Valve V ₂ Second Automatic Open / Close Valve V ₃ 3rd automatic opening / closing valve V ₄ 4th automatic opening / closing valve

Claims (3)

[Claims] 1. A suction side of a pump is connected to an outflow side of a solid-liquid separator utilizing centrifugal force, and a solid discharge side of the solid-liquid separator is connected to an upper part of a storage tank via a first opening / closing valve. The storage tank is provided with a lower outlet having a second opening / closing valve and an air vent pipe, and a branch pipe having a third opening / closing valve is provided between the discharge side of the pump and the storage tank. A suction-type solid-liquid separator characterized by being connected. 2. The first, second, and third on-off valves are automatic on-off valves, each of which is provided with a valve control device that controls each of the automatic on-off valves. Control to open the automatic open / close valve, close the second and third automatic open / close valves, and close the first automatic open / close valve and open the second and third automatic open / close valves in the stored-material discharge mode. The solid-liquid separation device according to claim 1, which is performed. 3. An air vent pipe is provided with a fourth automatic opening / closing valve,
The solid-liquid separation device according to claim 2, wherein the valve control device performs control such that the valve control device is closed during normal operation and opened during the stored-material discharge mode.