JPS634491Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a strainer cleaning device, and more particularly to a device for cleaning a strainer by causing a portion of passing fluid to flow backwards without removing the strainer from a pipe line.

Conventionally, many devices have been proposed for cleaning a strainer by causing the passing fluid to flow backwards, including Japanese Utility Model Publication No. 36-22677. However, these cleaning devices are large compared to the diameter of the pipe and have a complicated structure, so they not only require a large installation space but are also expensive. It had drawbacks such as not being able to be applied to certain situations.

The object of this invention is to provide a cleaning device that can eliminate the drawbacks of conventional strainer cleaning devices as described above.

This invention will be explained with reference to embodiments shown in the drawings.

In Figs. 1 to 4, 1 is a casing having an inlet 2 on one side and an outlet 3 on the other side. A downstream pipe 4 is connected to the outlet 3 of this casing, and a strainer 5 is arranged in this connected part. It is set up. A cylindrical valve chamber 6 with an open top is formed approximately in the center of the casing 1, and this valve chamber has upper and lower walls 7a, 7b, and a valve chamber 6 that is erected at a desired distance between the upper and lower walls 7a, 7b. A fluid communication path 8 is formed between these side walls, and a space 9,
A valve body 7 formed at 9' is rotatably disposed. The peripheral edges of the upper and lower walls 7a, 7b of the valve body 7 and the outwardly bent edges of both end portions of the side walls 7c, 7d are in sliding contact with the inner peripheral wall of the valve chamber 6. Also, casing 1
In the center of the outlet 3, an intermediate valve seat 10 facing the fluid flow direction is erected over the entire height so that its front and rear edges are in contact with the valve chamber 6 and the strainer 5. A presser rib 11 is similarly erected at the center of the inlet end of the downstream pipe 4.
The center portion of the strainer 5 is held between these members 10 and 11. Through holes 12 and 13 are formed in the lower wall 7b in the cavities 9 and 9', and these through holes are moved to a position where the downstream edge of the side wall 7c faces the upstream edge of the intermediate valve seat 10. When (Figure 5),
A through hole 15 and a through hole 12 bored in the bottom wall 14 of the valve chamber 6
match, and when the downstream edge of the side wall 7d moves to a position opposite to the upstream edge of the intermediate valve seat 10, the through hole 16 and the through hole 13 formed in the bottom wall 14 of the valve chamber 6 are aligned. It's starting to match. Upper and lower walls 7a,
Rotating shafts 17 and 17' are integrally and coaxially erected at the center of 7b, and the upper part of the rotating shaft 17 is connected to the upper cover 1.
8 and extends to the outside, and the lower part of the rotating shaft 17' passes through the bottom wall 14 of the valve chamber 6. Rotating shaft 17
The upper end is formed into a square shape, and an arrow 19 indicating the direction of the valve body 7 in the valve chamber 6 is engraved on the square end face, as shown in FIG. A scale plate 20 is provided.
A recess is provided at the lower end of the rotating shaft 17', into which the head 22 of the adjustment bolt 21 is fitted, and the head 22 is prevented from coming out by a fixing ring 23. The bolt 21 is screwed into a screw hole of a lower cover 24 attached to the casing 1, and by rotating this bolt 21,
The gap between the lower wall 7b and the bottom wall 14 is adjusted via the rotating shaft 17'. Note that 25 is a lock nut for the bolt 21.

A discharge pipe 27 equipped with a gate valve 26 is disposed below the casing 1, and this discharge pipe 27 is connected to the through holes 15 and 1 by branch pipes 28a and 28b, respectively.
6.

The effects of the above will be explained.

Under normal conditions (when not being cleaned), the side walls 7c and 7d of the valve body 7 are parallel to the flow direction as shown in FIGS. 1 to 4, and the arrow 19 points to the 0 scale on the scale plate 20, and Valve 26 is closed. The fluid then flows from the inlet 2 through the strainer 5,
Foreign matter that cannot pass through will adhere to the upstream side.

Next, foreign matter as described above will be cleaned, but if you want to clean the strainer 5, the rotating shaft 7
An operating handle (not shown) is fitted to the upper end of the valve body, and the valve body 7 is rotated clockwise by this handle so that the arrow 19 points to the R scale on the scale plate 20. Then, the downstream edge of the side wall 7c of the valve body 7 comes into sliding contact with the upstream edge of the intermediate valve seat 10, and the space 9 is positioned so as to communicate with the downstream pipe 4 (FIG. 5).
In this position, the fluid flowing in from the inlet 2 flows into the side wall 7c.
The water does not flow to the left upstream side of the strainer 5 in the flow direction because it is blocked by the flow direction, but flows out from the downstream pipe 4 through the right side of the strainer 5 on the opposite side, the downstream side of the strainer 5, and the downstream pipe 4. If the gate valve 26 is opened here, the side wall 7
The void 9 formed on the outside of c is the corresponding through hole 1.
2, 15 and the discharge pipe 27 and the pressure is reduced, a part of the fluid on the downstream side of the strainer 5 flows into the space 9 through the left side of the strainer 5. The foreign matter adhering to the left upstream side is cleaned and finally discharged to the discharge pipe 27.

After cleaning the left side of the strainer 5 in this way, turn the handle counterclockwise so that the arrow 19 points to the L scale on the scale plate 20. Then, the downstream edge of the side wall 7d of the valve body 7 comes into sliding contact with the upstream edge of the intermediate valve seat 10, and the space 9' is positioned so as to communicate with the downstream pipe 4. Then, the same phenomenon as described above occurs on the right side of the strainer 5, and the right upstream side of the strainer 5 is cleaned.

When closing the flow, close the gate valve 26 and move the valve body 7 counterclockwise from the L scale position past the O and R scales until the arrow 19 points to the scale plate 20.
When the valve body 7 is rotated so as to point to the S scale above, the side walls 7c and 7d of the valve body 7 become perpendicular to the flow direction as shown in FIG. 6, and the flow is completely closed.

After cleaning the strainer 5 as described above, close the gate valve 26 and rotate the valve body 7 so that the arrow 19 points to the 0 scale on the scale plate 20. The strainer 5 returns to its normal position and performs filtration using the strainer 5.

Although the above description has been made with respect to horizontal conduits for convenience of explanation, it is also applicable to other vertical conduits or inclined conduits. When applied to a vertical pipe or an inclined pipe and when the fluid flows down naturally, a separate gate valve is provided on the outlet side of the downstream pipe 4, and the strainer 5 is cleaned by closing this gate valve. You can also do it. In other cases, the diameter of the discharge pipe 27 is made smaller than the diameters of the inlet 2 and outlet 3, and the amount of discharge from the branch pipes 28a and 28b is reduced, so that the strainer 5 can be removed without stopping the flow. Can be washed.

Although the branch pipes 28a and 28b are connected to the lower part of the casing 1, the valve body 7 and the upper cover 18 are placed close to each other, and the through holes 12 and 13 are connected to the upper wall 7a of the valve body 7.
Alternatively, through holes 15 and 16 may be provided in the upper cover 18 of the casing 1, respectively, and branch pipes 28a and 28b may be connected to the through holes 15 and 16, respectively.

Furthermore, instead of manually operating the rotating shafts 7, 7' and the gate valve 26 using the operating handle, it is also possible to automatically operate the rotating shafts 7, 7' and the gate valve 26 using an automatic drive device. Needless to say, it can be done.

Figures 7 and 8 show another embodiment of this invention, in which the through holes 12, 13, 15, 16 provided in the previous embodiment,
Instead of the branch pipes 28a, 28b and the gate valve 26,
Through holes 15', 16' are bored in the peripheral wall of the casing 1 on the downstream side of the valve chamber 6, and these through holes 15', 1
Branch pipes 28a' and 28b' are connected to the branch pipes 28a' and 28b', respectively.
In this case, the gate valves 26, 2
By closing one side of the strainer 6' and opening the other side, it becomes possible to clean the strainer of foreign matter.
The other parts and effects are the same as those of the previous embodiment, so the same parts are given the same reference numerals and the explanation will be omitted.

Since this device is constructed as described above, it is not necessary to stop the flow in the pipe line or to remove the strainer from the pipe line, and foreign matter adhering to the strainer can be quickly and reliably cleaned.Moreover, the overall structure In addition to being small and inexpensive and not requiring a large installation space, it also has excellent effects such as being applicable to horizontal, vertical, and inclined pipes.

[Brief explanation of drawings]

Fig. 1 is a plan view of an embodiment of this invention, Fig. 2 is a longitudinal sectional front view of the same, Fig. 3 is a longitudinal sectional side view of the same,
Fig. 4 is a cross-sectional plan view of the same in the normal state (non-cleaning state), Figs. 5 and 6 are cross-sectional plan views for explaining the action of the above, and Figs. 7 and 8 show another embodiment of this invention. It is a drawing for explaining. 1... Casing, 2... Inlet, 3... Outlet, 4... Downstream pipe, 5... Strainer, 6... Valve chamber, 7... Valve body, 7
a, 7b... Upper and lower walls, 7c, 7d... Side walls, 8... Communication passage, 10... Intermediate valve seat, 12, 13... Through hole, 15,
16...Through hole, 17, 17'... Rotating shaft.

Claims (1)

[Claims for Utility Model Registration] 1. A valve chamber is formed inside a casing equipped with a strainer on the outlet side, and a valve chamber is provided with upper and lower walls, and a valve chamber is provided with a vertical wall at a desired distance between the two walls. A fluid communication path is formed between the side walls, and a valve body having a cavity formed by the side walls and the casing wall is rotatably disposed outside the valve body, and the peripheral edges of the upper and lower walls and Both end edges of the side wall are in sliding contact with the inner circumferential wall of the valve chamber, and an intermediate valve seat facing the fluid flow direction is installed at the center of the outlet of the casing so that its front and rear ends are in contact with the valve chamber and the strainer. and further provided with a through hole in the casing wall that communicates with the cavity when the downstream edge of one of the side walls is positioned so as to face the upstream edge of the intermediate valve seat. A strainer cleaning device characterized by having a perforation. 2. The scope of the utility model registration claim, in which the through hole is formed in one of the upper and lower walls corresponding to the cavity of the valve body, and in the upper wall or lower wall of the casing facing this wall so as to match each other. The strainer cleaning device according to item 1. 3. The strainer cleaning device according to claim 1, wherein the through hole is formed in the peripheral wall of the casing on the downstream side of the valve chamber.