JPH03278809A - Device for removal of foreign matter for pipe - Google Patents

Abstract

PURPOSE:To automatically remove foreign matter from a pipe by a method wherein a screen is provided in the pipe in such a manner as to allow at least a part of fluid in the pipe to enter the screen, pressures inside and outside the screen are detected and a driving means for opening and closing a shut-off valve is controlled in response to the difference in the pressures thus detected. CONSTITUTION:A pipe 3 is provided therein with a screen 5 in such a manner as to allow at lest a part of fluid in the pipe to enter the screen. A discharge pipe 9 and its shut-off valve 8 are provided to expel the fluid which has entered the screen 5 to the outside of the pipe and a driving means 10 is provided to open and close the shut-off valve 8. The inner pressure of the pipe inside the screen 5 or at its upstream part and outside the screen 5 or at its downstream part are detected by pressure detecting means 11 and 12. A control part 13 controls the action of the driving means 10 in response to the difference between the above-mentioned pressure. As a result, the foreign matter collected by the screen can be removed efficiently and automatically.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a device for removing foreign objects in a pipe, and more particularly to a device for removing foreign objects in a pipe that collects foreign objects contained in a fluid in a pipe with a screen and discharges them outside the pipe. be.

Conventional technology Conventionally, a screen was placed inside the pipe as a foreign matter removal device for collecting foreign matter contained in the fluid flowing inside the pipe and discharging it outside the pipe, and the fluid flowing into the screen was discharged outside the pipe. It is known that the screen is equipped with a discharge pipe and its shutoff valve, and the shutoff valve is opened when foreign matter is accumulated on the screen, thereby discharging the foreign matter collected on the screen together with the fluid out of the pipe. .

Problems to be Solved by the Invention However, with the above configuration, there is a problem in that a person must open and close the shutoff valve, and since the amount of foreign matter collected on the screen cannot be confirmed, unnecessarily large amounts of foreign matter are discharged. Unless fluid is discharged from the pipe to remove foreign matter, clogging of the screen cannot be prevented, and more fluid than necessary is released when discharging foreign matter, making it impossible to efficiently discharge the collected foreign matter. There was a problem.

The present invention solves the above-mentioned conventional problems, and aims to provide an intraductal foreign matter removal device that can efficiently and automatically remove foreign matter collected by a screen.

Means for Solving the Problems In order to solve the above-mentioned problems, the apparatus for removing foreign matter in a pipe according to the present invention is provided by arranging a screen in the pipe so that at least a part of the fluid in the pipe flows into the pipe, and by disposing a screen in the pipe so that at least a part of the fluid in the pipe flows into the pipe. In addition to providing a discharge pipe for discharging the water to the outside of the pipe and its shutoff valve, a means for opening and closing the shutoff valve is also provided, and the pressure difference between the inside of the screen or its upstream part and the outside of the screen or its downstream part is determined by detecting the pressure inside the pipe. Means for controlling the opening/closing drive means accordingly is provided.

According to the above structure, foreign matter contained in the fluid in the pipe is collected by the screen, and a pressure difference is generated between the inside and outside of the screen or between the upstream and downstream sides of the screen, depending on the amount of the collected foreign matter. When the amount of foreign matter collected increases and the differential pressure exceeds a predetermined value, it is detected by the control means, the shutoff valve is opened by the opening/closing drive means, and the foreign matter collected on the screen is discharged together with the fluid inside the screen. It is discharged from the tube to the outside. Furthermore, when the foreign matter is removed from the screen and the differential pressure drops below a predetermined value, the shutoff valve is closed. In this way, foreign objects are automatically removed from inside the tube.

Example Hereinafter, one embodiment of the present invention will be described based on FIG.

In FIG. 1, 1 is a Y inserted in the middle of a fluid pipe 2.
This is a mold strainer, and a branch pipe 4 extends diagonally downward from the middle part of a main pipe 3, and a cylindrical screen 5 is disposed within the branch pipe 4. One end 5a of this screen 5 is in contact with an inclined opening edge 6 formed protrudingly in the middle part of the main pipe 3, and the other end 5b is in contact with a screen retaining ring 7 fixed in contact with the tip of the branch pipe 4. There is. A discharge pipe 9 is connected to the branch pipe 4 via a screen retaining ring 7 and a gate valve 8. The gate valve 8 is configured to be openable and closable by a drive motor 10.

Pressure detection means 11 and 12 are attached to the main pipe 3 at an upstream and downstream part of the inclined opening edge 6, respectively, and their detection signals are inputted to a control section 13 that controls the drive motor 10. In addition, the pressure detection means 11゜12 and the control section 1
Among the functions of 3, a differential pressure gauge may be used for the function of detecting the differential pressure of the detected pressures.

Next, to explain the operation, the fluid flowing in the fluid pipe line 2 passes through the screen 5 by the Y-shaped strainer 1, and the foreign matter contained in the fluid is collected by the screen 5 and removed. The fluid flows downstream. On the other hand, when foreign matter is collected on the screen 5, the eyes become clogged, and a difference in fluid pressure is generated between the upstream and downstream parts of the screen 5 depending on the amount of foreign matter. This differential pressure is detected by pressure detection means 11 and 12 and input to the control section 13. When the amount of foreign matter increases and the detected differential pressure exceeds a predetermined value, the control unit 13 drives the drive motor 10 and opens the gate valve 8. As a result, a part of the fluid that has flowed into the screen 5 is discharged from the discharge pipe 9 to the outside of the fluid conduit 2 through the gate valve 8 together with the foreign matter collected by the screen 5, and the screen 5 is cleaned. Further, when the foreign matter is removed from the screen 5 and the differential pressure falls below a predetermined value, the drive motor 10 is driven in the opposite direction by a command from the control section 13, and the gate valve 8 is closed.

Note that, when the differential pressure between the upstream and downstream portions of the screen 5 reaches 0.1 to 2.0 kgf/aJ, the control unit 13 drives the drive motor 10 to open the gate valve 8, so that the differential pressure becomes 0. .1k
When the value falls below gf/aJ, the drive motor 10 is reversely driven to close the gate valve IO. This is because if the differential pressure for opening and closing operations is set to less than 0.1 kgf/aJ, there is a risk of malfunction, and if it is set to more than 2.0 kgf/cJ, too much foreign matter will accumulate on the screen 5, which is inconvenient.

In the above embodiment, a gate valve is also provided at the outlet of the main pipe 3,
When discharging foreign matter, this may be closed to discharge the foreign matter all at once.

Next, another embodiment of the present invention will be described based on FIG.

The strainer 21 of this embodiment has a main pipe 22 made of a straight pipe.
A screen 23 whose downstream end is closed in the lower half of the cross section of the flow path inside the
is arranged, and the upper half of the cross section of the flow path in the main pipe 22 is configured so that the fluid passes through it as it is. 24 is main pipe 2
2 from above and opens into the screen 23, and an underground fire hydrant 25 is attached to the upper end of the discharge pipe. This fire hydrant 25 is provided with a drive motor 26 for opening and closing. A pressure detection means 27 for detecting the internal pressure of the screen 23 and a pressure detection means 28 for detecting the external pressure are provided, and the detection signal is transmitted to the drive motor 2.
The signal is inputted to a control section 29 that drives and controls 6.

In this embodiment as well, when foreign matter accumulates in the screen 23 as in the above embodiment, a pressure difference is generated between the outside and the outside of the screen 23, and as a result, the fire hydrant 25 is automatically opened by the control unit 29, and the fire hydrant 25 is opened inside the screen 23. When the inflowing fluid flows out to the outside through the discharge pipe 24 and the fire hydrant 25, foreign matter is discharged along with it. Moreover, when the foreign matter is discharged and the differential pressure decreases, the fire hydrant 25 is automatically closed.

Effects of the Invention According to the in-pipe foreign matter removal device of the present invention, when foreign matter is collected by the screen and the differential pressure between the inside and outside of the screen, or between the upstream and downstream sides thereof, exceeds a predetermined value, this is detected by the control means. and the shutoff valve is opened by the opening/closing driving means.
The foreign matter collected on the screen is discharged from the discharge pipe along with the fluid, and when the foreign matter is removed from the screen and the differential pressure drops below a predetermined value, the shutoff valve is closed. The effect is that foreign matter can be efficiently removed from the pipe without wasting it.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of one embodiment of the intraductal foreign matter removal device of the present invention, and FIG. 2 is a longitudinal sectional front view of another embodiment of the invention. 1... Y-type strainer, 5, 23... Screen,
8...Gate valve, 9,24...Discharge pipe, 10,26...
...Drive motor. 11.12, 27.28...Pressure detection means, 13.2
9...Control unit, 21...Strainer, 25...Fire hydrant.

Claims (1)

[Claims] 1. A screen is arranged in the pipe so that at least a part of the fluid in the pipe flows in, and a discharge pipe and a shutoff valve are provided for discharging the fluid that has flowed into the screen to the outside of the pipe, and a means for driving the shutoff valve to open and close is provided. 1. A device for removing foreign matter in a pipe, comprising means for detecting pressure inside the screen or an upstream part thereof and outside the screen or downstream thereof, and controlling an opening/closing drive means according to the differential pressure therebetween.