JP2007083102A - Strainer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a strainer not requiring for cutting of water supply even when it is required that water always continuously flows as in waterworks and capable of easily and effectively removing an accumulated foreign matter in resistant to a strong water stream. <P>SOLUTION: The strainer comprises a case member 1 attachable to a pipe P; and a strainer body part B arranged in the case member 1. The strainer body part B has a screen 3 having a large number of small holes capable of capturing the foreign matter in a fluid flowing in the pipe P and made to an approximately cylindrical shape in which an axial direction is approximately parallel to the pipe P. The screen 3 is rotatably operable from the outside, and a reverse washing member 6 slide-contacts with an outer peripheral surface of the screen 3 and capable of discharging the foreign matter deposited on the screen 3 by rotation of the screen 3 is provided on the strainer body part B. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a strainer. Specifically, the strainer includes a case member that can be attached to a pipe, and a strainer main body disposed in the case member. The strainer main body is a foreign substance in a fluid flowing in the pipe. The present invention relates to a strainer having a screen having a number of pores that can be supplemented with a substantially cylindrical shape whose axial direction is substantially parallel to the tube.

  A strainer is provided in the middle of the fluid conduit to filter out various foreign substances present in the fluid. For example, in the middle of water supply pipes buried in the soil, strainers are installed at appropriate intervals, and manholes are provided at the locations where the strainers are provided. The worker removes the foreign matter captured by the strainer regularly or irregularly.

This strainer has a screen with a large number of pores for filtration inside, and the flanges provided at both ends are connected to the flange of the fluid piping via fasteners such as bolts and nuts. The foreign matter in the fluid is captured with a screen and filtered. If foreign matter accumulates, the flow of fluid will deteriorate, so in order to remove the accumulated foreign matter, regular or irregular inspection, removal and cleaning (for example, Patent Document 1)
JP 2004-275958 A

  However, the strainer of the above prior art has a problem that it is necessary to stop the fluid flowing in the pipe in advance in order to remove the accumulated foreign matter with the progress of use. There is a problem of having to.

  Therefore, an object of the present invention is to eliminate water accumulated easily and effectively against the strong water flow even when it is necessary to keep the water constantly flowing as in the case of waterworks. It is to provide a strainer that can.

  The above-mentioned subject is achieved by the invention described in each claim. That is, the strainer according to the present invention includes a case member that can be attached to a pipe, and a strainer main body disposed in the case member. The strainer main body is a fluid that flows in the pipe. In a strainer that has a large number of pores that can capture foreign matter therein and has a substantially cylindrical screen whose axial direction is substantially parallel to the tube, the screen can be rotated from the outside. At the same time, the strainer main body is provided with a backwashing member that is in sliding contact with the outer peripheral surface of the screen and can discharge foreign matter adhering to the screen by the rotation of the screen.

  According to this configuration, since the axial direction of the substantially cylindrical screen that captures foreign matter in the fluid is substantially parallel to the pipe, the resistance to the flow of both bodies can be small, so it is not necessary. Rotating operation in the water state becomes easy, and when the screen is rotated from the outside, the foreign matter adhering to the outer peripheral surface of the screen is surely removed and discharged by the backwash member slidingly contacting the outer peripheral surface of the screen. Therefore, the foreign matter accumulated on the screen can be easily and effectively removed.

  As a result, there is no need to shut off water even when it is necessary to keep water flowing constantly as in waterworks, and a strainer that can easily and effectively remove accumulated foreign matter against strong water flow. Could be provided.

  The backwashing member has a substantially L shape, and a narrow passage is formed on a surface that is in sliding contact with the outer peripheral surface of the screen. It is preferable to be able to discharge from the flow path.

  According to this configuration, due to the contact between the rotating screen and the backwashing member, the removed foreign matter is vigorously discharged by the strong water flow flowing in the pipe.

  It is preferable that a viewing window is provided in the case member so that the outer peripheral surface of the screen is visible from the outside.

  According to this configuration, it is possible to appropriately determine the timing for cleaning the strainer, to reduce wasteful work man-hours, and to clean the foreign water in a timely manner when foreign matter is attached. The water can flow smoothly.

  It is preferable that a discharge port capable of discharging foreign matter attached to the screen is provided at a bottom portion of the case member.

  According to this configuration, large, relatively heavy foreign matter is collected near the bottom discharge port and discharged to the outside according to the properties of the foreign matter, so that foreign matter can be discharged without difficulty.

  It is preferable that the screen and the backwash member are supported by a lid member of the strainer main body.

  According to this configuration, when the screen is to be removed, for example, when the screen is to be removed, it can be easily removed from the case member simply by lifting the lid member of the strainer body, and the work efficiency is good. Can be removed safely.

  An embodiment of a strainer according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a front sectional structure showing the inside of the strainer according to the present embodiment (the screen 3 is represented by a sectional view of the upper half of the screen 3), and FIG. 2 is a sectional view taken along the line AA of the strainer of FIG. 3 shows a planar structure of the strainer of FIG. 1, and FIG. 4 shows a front structure showing a state in which the strainer of FIG. 1 is mounted on an existing pipe. Hereinafter, an example in which the strainer of the present embodiment is provided in the middle of a water pipe will be described.

  As shown in FIG. 4, the strainer S includes a case member 1 connected to the existing pipe P using a push ring 2 that pushes a packing (not shown) to connect to the existing pipe P at both ends, and a strainer inside the case member 1. And a main body B. However, instead of the push wheel 2, a flange may be provided at the end of the case member 1 and connected to the existing pipe P. As shown in FIG. 1, the strainer body B has a screen 3 having a large number of pores. The screen 3 has a large-diameter, generally cylindrical portion having an opening 3a on the rear end side, and a tubular portion 3d having a smaller diameter toward the downstream side. The axis is substantially parallel to the tube axis Z. The screen 3 has both a cylindrical upstream side surface 3b and a body portion 3c configured in a net shape having an opening of about 100 to 150 mesh, and is rotatable around the tube axis Z. Bearings (not shown for the sake of simplicity) are mounted on the outer peripheral portions of the small-diameter cylindrical portion 3d in the longitudinal direction, and an O-ring serving as a seal member is provided on the outer peripheral surface of the small-diameter cylindrical portion 3d. A plurality of (11 in FIG. 1) 11 are mounted between the strainer body B on the downstream side. Further, a seal packing ring 12 is mounted between the bottom of the strainer body B on the downstream side and the case member 1. Arrow F indicates the direction of tap water flow.

  The screen 3 can be rotated from the outside via a handle 4 provided on the upper surface side of the strainer body B on the downstream side. That is, by rotating the handle 4, the screen 3 is moved by the timing belt 5 wound around the gear portion 3e (FIG. 5) provided on the outer surface of the small diameter cylindrical portion 3d of the screen and the handle shaft. It is rotated. In this case, since the rotation axis of the substantially cylindrical screen 3 is parallel to the water flow direction F, the rotation operation itself does not oppose the water flow even when the water flow is strong. There is little resistance, and the rotating operation by the handle 4 is easy and smooth.

  Further, the backwash member 6 that is in sliding contact with the outer peripheral surface of the screen 3 is fixed to the upper inner peripheral surface side of the lid member 20 of the strainer main body B. The backwash member 6 is formed in a substantially L shape having a discharge port 6a at a position where the backwash member 6 is inserted into the upper discharge port of the strainer body B connected to the opening / closing valve 7 on the upper surface side. The inner surface side is in sliding contact with the outer peripheral surface of the screen 3. The backwash member 6 has a narrow slit-like flow path 6b (FIGS. 5 and 6) on the surface in sliding contact with the outer peripheral surface of the screen 3. Since the flow path 6b is formed with a relatively narrow width, the stripped foreign matter is vigorously discharged by the strong water flow flowing in the pipe P. The screen 3 and the backwash member 6 are supported by the lid member 20 of the strainer main body B. In FIG. 6, the surface of the backwash member 6 on the side in sliding contact with the outer peripheral surface of the screen 3 may be formed into a curved surface so as to come into surface contact with the outer peripheral surface of the screen 3.

  When the opening / closing valve 7 is opened and the screen 3 is rotated by operating the handle, the foreign matter adhering to the screen 3 is peeled off in contact with the lower end portion of the backwash member 6, and the removed foreign matter is the momentum of the flowing water. Thus, it passes through the discharge port 6a via the flow path 6b, is discharged to the outside through the opening / closing valve 7, and a large relatively heavy foreign matter is collected near the bottom discharge port 8, and the opening of the bottom opening / closing valve 9 It is discharged from the bottom opening / closing valve 9. As described above, since the discharge ports 6a and 8 provided at two places on the top and bottom of the case member 1 are discharged to the outside according to the properties of the removed foreign matter, the foreign matter can be discharged without difficulty. This can be done without causing troubles such as clogging.

  Further, the case member 1 is provided with a viewing window 10 fitted with a transparent glass or resin plate as shown in FIG. 4 on one side or both sides thereof. The adhesion status is visible from the outside. Therefore, it is possible to properly determine the timing for cleaning the strainer S, to reduce wasteful work man-hours, and to clean the water pipe P smoothly at any time when foreign matter is attached. Water can be allowed to flow through.

  Next, a maintenance method for the strainer main body B constituting the strainer S, which is performed when the screen 3 becomes very dirty or damaged, will be described with reference to FIGS.

  With respect to the state of FIG. 4, as shown in FIG. 7 (hereinafter, the flange portion is also omitted in FIGS. 8 to 10), the work gate valve device 13 is mounted so as to surround the upper portion of the strainer main body B. For example, as shown in the enlarged portion of FIG. 7, this attachment is fixed by pressing several points on the overhanging portion of the lid portion of the strainer body B using a bolt 19 having a sharp tip. Can be done.

  Next, as shown in FIG. 8, a pressure tank member 14 having flanges at the upper and lower ends is attached to the upper part of the working gate valve device 13, and a lifting shaft 15 is connected to the strainer main body B. An upper lid 16 having a lifting shaft 15 at the center is connected and attached to the upper end of the pressure tank member 14. Then, for fixing the connection bolt 21 used for connection between the case member 1 and the strainer main body B, a tool is inserted from the gap between the lower end portion of the working gate valve device 13 and the existing pipe P. Release by. However, the method for releasing the connection between the case member 1 and the strainer body B is not limited to this. In addition, the connection between the lifting shaft 15 and the strainer body B is, for example, a threaded portion provided at the lower end of the lifting shaft 15 and a female screw portion (illustrated) provided on the upper portion of the threaded portion and the strainer body B. Can be connected by screwing together.

  Furthermore, as shown in FIG. 9, when the lifting shaft 15 is pulled up using a rotating jig (not shown) and the strainer main body B is pulled up, and the strainer main body B reaches the upper side of the working gate valve 13. Then, the gate valve opening / closing handle 17 is rotated to feed the gate valve 18 to block the vertical space.

  When the feeding operation of the gate valve 18 is completed, as shown in FIG. 10, the strainer body B is taken out together with the upper lid 16 and the lifting shaft 15, and the strainer body B is removed from the lifting shaft 15 to maintain the strainer body B. Will do. In this case, since the screen 3 and the backwashing member 6 are supported by the lid member 20, the removal work becomes easy.

  When the maintenance of the strainer main body B is completed, the strainer main body B can be accommodated in the case member 1 and connected through a procedure reverse to the above-described procedure. During this time, tap water flowing in the pipe P is not blocked.

[Another embodiment]
(1) Although the above embodiment has been described with reference to an example in which a strainer is provided in the middle of a water supply pipe, the strainer of the present invention can also be used in the middle of other fluid piping such as industrial water piping.
(2) In the above embodiment, the screen has been described as an example of a mesh having a mesh size of about 100 to 150 mesh, but various screens can be selected according to the properties of the fluid. The manufacturing method may be a porous material such as a punching plate in which a large number of pores are formed in a plate material in addition to a knitted wire, and the manufacturing method is not particularly limited.
(3) In the above embodiment, the case member 1 and the substantially L-shaped backwash member 6 are shown as separate bodies. However, the backwash member is formed integrally with the case member by a method such as casting. May be.

Sectional front view which shows the inside of the strainer which concerns on one Embodiment of this invention. A-A line sectional view of the strainer of FIG. Top view of the strainer in FIG. Front view showing a state in which the strainer of FIG. 1 is mounted on an existing pipe The perspective view which shows the connection of the screen and backwash member which comprise the strainer of FIG. The fragmentary perspective view of the backwash member which slidably contacts with the screen of FIG. Partial front sectional view for explaining a maintenance method of the strainer main body in FIG. Partial front sectional view for explaining a maintenance method of the strainer main body in FIG. Partial front sectional view for explaining a maintenance method of the strainer main body in FIG. Partial front sectional view for explaining a maintenance method of the strainer main body in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Case member 3 Screen 6 Backwash member 6b Flow path 8 Outlet 10 Viewing window 20 Lid member B Strainer main-body part P Pipe

Claims (5)

A case member that can be attached to a pipe and a strainer main body disposed in the case member. The strainer main body has a large number of pores that can capture foreign substances in the fluid flowing in the pipe. A strainer having a substantially cylindrical screen whose axial direction is substantially parallel to the tube;
The screen can be rotated from the outside, and a backwashing member is provided on the strainer main body so as to be in sliding contact with the outer peripheral surface of the screen and capable of discharging foreign matter adhering to the screen by the rotation of the screen. Strainer characterized by. The backwashing member has a substantially L shape, and a narrow passage is formed on a surface that is in sliding contact with the outer peripheral surface of the screen. The strainer according to claim 1, wherein the strainer can be discharged from the flow path. The strainer according to claim 1, wherein a viewing window is provided in the case member, and an outer peripheral surface of the screen is visible from the outside. The strainer according to any one of claims 1 to 3, wherein a discharge port capable of discharging foreign matter attached to the screen is provided at a bottom portion of the case member. The strainer according to any one of claims 1 to 4, wherein the screen and the backwash member are supported by a lid member of the strainer main body.

Images