JP3059023B2 - Filter for pipeline - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter for pipelines, which is particularly advantageously retrofitted to pipelines already plumbed.

[0002]

2. Description of the Related Art A filter of this type is often retrofitted to an already installed pipeline in order to remove foreign matter such as scale contained in a fluid flowing through the pipeline. The conventional process in such a case will be described below with reference to FIG. (A) First, the valve 02 on the upstream side of the line 01 is closed to shut off the flow in the line 01,
(B) The pipe line 01 is cut off in accordance with the length of the casing 04 of the filter 03 to be mounted. (C) A flange 05 is mounted near the opening of the cut-off pipe line 01 by a special pressing wheel or the like. The filter 03 is interposed in the gap 06 of the cut pipe 01, and bolts and the like are inserted into the flanges 05 and 07 of the pipe 01 and the filter 03 to finally fix the filter 03 to the pipe 01.

[0003]

In the case of such a conventional filter for a pipeline, a casing 04 having substantially the same inner diameter and outer diameter as the pipeline 01 is prepared, and the pipeline 01 is set to the length of the casing 04. Since it is necessary to cut off each time, material costs are wasted, and the mounting work is significantly complicated due to cutting off the pipe 01 and mounting the flange 05 on the pipe 01. And other factors that greatly increase the installation cost. Further, the filter 03 having such a configuration cannot provide a sufficient sealing effect between the casing 04 of the filter 03 and the pipe 01 with respect to the pipe 01 which cannot move at all along the axial direction. As a result, it was almost impossible to install.

The present invention has been made in view of such a problem. By replacing the casing of the filter with the conduit itself, wasteful materials are reduced as much as possible, and the work of mounting the filter is simplified. It is another object of the present invention to ensure that the filter can be securely mounted on the pipeline regardless of the axial movement of the pipeline.

[0005]

SUMMARY OF THE INVENTION To achieve the above object, the present invention is directed to a line for a line with a filter element which, when arranged in the line, covers the outlet of the line almost completely. A filter, wherein the filter element comprises a loop-shaped elastic support frame having a peripheral shape adapted to a shape of a flow passage of a pipe, and a flexible filter medium carried around the entire circumference of the support frame. When inserted into the conduit through an opening provided in the peripheral wall of the conduit, the filter element can be deformed along the inner surface of the flow outlet, and at the outer edge of the support frame, a filter element is disposed in the conduit. A plug for closing the opening of the pipeline in the closed state is attached.

[0006]

When the filter element is inserted into the conduit through the opening, the filter element gradually passes through the opening while contracting and deforming in an elongated manner corresponding to the width of the opening.
When the distal end portion of the filter element comes into contact with the inner peripheral wall of the conduit, the filter element starts to gradually expand in the lateral direction, due to the compression between the plug and the inner peripheral wall of the conduit. When the filter element is completely housed in the conduit, the resilient support frame of the filter element is pressed against the inner peripheral wall of the conduit with sufficient pressure over almost the entire circumference, whereby a flexible filter medium is provided throughout the flow outlet. Is stretched out. At this time, the opening of the conduit is closed by a plug provided at the outer edge of the support frame. When the plug is lifted or the support frame is lifted directly to remove the filter element, the filter element gradually contracts and deforms in the reverse order, passing through the opening of the line, Pulled out.

[0007]

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

FIGS. 1 and 2 show the structure of a filter element 1 according to an embodiment of the present invention in detail. The filter element 1 has a loop-shaped elastic support frame 4 having a peripheral shape adapted to the shape of the flow opening 3 of the conduit 2 (FIGS. 3, 4, 5, and 6), and is supported on the support frame 4 over the entire circumference. And a filter material 5 such as a flexible filter paper or a wire mesh. A connecting rod 6 is connected to the support frame 4 of the filter element 1, and a flange 7 is fixed near the connecting portion of the connecting rod 6.
A rubber or plastic plug 9 for closing and sealing the opening 8 of the pipe line 2 (FIGS. 5 and 6) is interposed between the support frame 4 and the outer edge of the support frame 4.

The elastic supporting frame 4 includes an elastic frame 10 preferably made of steel or hard plastic, and a flexible rubber or plastic strip 1 fixed to the outer peripheral surface of the frame 10.
And 1. The elastic support frame 4 has an oval or elliptical shape in a natural state where it is not subjected to an external force, but has a substantially circular shape in a natural state corresponding to the shape of the flow opening 3 of the conduit 2. If it is configured to expand, there is an advantage that the support frame 4 or the strip 11 and the inner peripheral wall 12 of the conduit 2 can be more securely adhered.

When the filter element 1 is inserted into the conduit 2 on the outer peripheral surface of the strip 11, the inner peripheral wall 12 of the conduit 2
It is advantageous if a projection 13 is provided for abutting against and preventing displacement. Further, if a V-shaped cut is formed on the outer peripheral surface of the strip 11 that expands in the circumferential direction outward, the strip 11 contracts and expands more smoothly along the plane of the flow opening 3.

At the upper end of the connecting rod 6, a trapezoidal or truncated square pyramidal detent member 14 which contracts downward is fixed. The detent member 14 cooperates with a detent tube 15 (FIGS. 4, 5 and 6) when the filter element 1 is inserted into the pipeline 2 to rotate or rotate the filter element 1 as described later. Prevent misalignment.

The filter element 1 is connected to a pipe 2
When the filter element 1 is to be retrofitted inside, the opening 8 for passing the filter element 1
Is provided. The width of the opening 8 can be made somewhat smaller than the width of the outlet 3 of the conduit 2 since the filter element 1 can contract and expand along the plane of the outlet 3.

Next, a connecting saddle comprising an upper saddle 16 and a lower saddle 17, a detent tube 15 and a guide cylinder 18 are respectively fitted to the pipe line 2 so as to be aligned with the position of the opening 8. , 20, 21. In this case, a connection short pipe 22 can be provided upright on the upper saddle 16 as necessary.

An operation rod 24 provided with an operation handle 23 and a filter element 1 which has already been elongated and contracted by receiving a compressive force from an inner wall 25 are accommodated in the guide tube 18 in advance. In this case, as shown in FIG. 1, the operating rod 24 and the filter element 1 are connected to each other via, for example, the external thread 26 of the distal end of the operating rod 24 and the corresponding female screw 27 of the rotation preventing member 14.

The inner peripheral wall 28 of the detent tube 15 is formed in a truncated pyramid shape which also contracts downward so as to fit the detent member 14 having a truncated quadrangular pyramid shape. However, the dimensions of the truncated square pyramid-shaped inner peripheral wall 28 must be large enough to allow the passage of the flange 7 and the plug 9.

Next, when the filter element 1 is pushed down through the operation handle 23, the filter element 1
Passes through the non-rotating pipe 15, the connecting short pipe 22, and the opening 8, and enters the pipe line 2. In this case, since the filter element 1 is already elongated and contracted in the guide tube 15, the amount of new contraction deformation of the filter element 1 required to pass through the opening 8 of the conduit 2 is small, and therefore the filter element It is not necessary to particularly increase the force for pushing down the filter element 1, so that the filter element 1
The wear and stresses experienced by them are negligible.

The filter element 1 gradually passes through the opening 8 while slightly shrinking, and then, as shown in FIG.
When the filter element 1 is in contact with the bottom of the inner peripheral wall 12, the filter element 1 is compressed between the connecting rod 6 and the inner peripheral wall 12,
This time it begins to expand gradually in the horizontal direction. At the same time, the detent member 14 starts to enter the detent tube 15, and the expansion direction of the filter element 1 is gradually defined so as to be parallel to the plane of the flow opening 3 of the conduit 2.

As shown in FIG. 5, the filter element 1
Is completely accommodated in the conduit 2, the resilient support frame 4 of the filter element 1 is pressed against the inner peripheral wall 12 of the conduit 2 with sufficient pressure over substantially the entire circumference, whereby the flow opening 3 A flexible filter medium 5 is spread over the entire area.
Further, at this point, the detent member 14 is rotated by the detent tube 15.
The filter element 1 is tightly fitted to achieve the rotation of the filter element 1 and the plug 9 completely closes the opening 8 of the conduit 2.

Finally, as shown in FIG. 6, the guide cylinder 18 is removed from the detent tube 15, and the operating rod 24 is removed from the detent member 14, and a pressing member 29 is attached to the detent tube 15 instead. The holding member 29 is for holding down the rotation preventing member 14 via the holding protrusion 30 provided integrally.

When the filter element 1 is loaded, as described above, the strip 11 and the projection 13 are attached to the inner peripheral wall 1 of the pipe 2.
In addition to being crimped with sufficient force to 2, the detent member 14 fits tightly into the detent tube 15,
There is no danger of the filter element 1 being undesirably moved by the pressure of the flowing medium in the line 2.

The step of removing the filter element 1 is as follows.
It is no longer clear that this is done in exactly the reverse order.

[0022]

According to the present invention, since the casing of the filter is replaced by the pipe itself, material waste is reduced. Basically, it is only necessary to provide a relatively small opening for the contracted filter element to pass through the conduit, so that the operation of mounting the filter is greatly simplified. Furthermore, the filter according to the invention can be mounted on pipes that cannot move at all along the axial direction.

[0023]

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of a filter element.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a cross-sectional view of an initial stage of inserting a filter element into a pipeline.

FIG. 4 is a cross-sectional view of a stage when a filter element is being inserted into a pipeline.

FIG. 5 is a cross-sectional view showing a state where the filter element is completely inserted into the pipe.

FIG. 6 is a cross-sectional view showing a step of holding a filter element in a pipeline.

FIG. 7 is a longitudinal sectional view showing a conventional filter mounting process.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Filter element 2 Pipeline 3 Flow port 4 Support frame 5 Filter medium 6 Connecting rod 7 Flange 8 Opening 9 Plug body 10 Frame body 11 Strip 12 Inner peripheral wall of pipe 2 13 Projection 14 Detent member 15 Detent pipe 16 Upper Saddle 17 Lower saddle 18 Guide tube 19 Flange connection part 20 Flange connection part 21 Flange connection part 22 Short connection pipe 23 Operation handle 24 Operation rod 25 Inner wall of guide cylinder 26 Male screw 27 Female thread 28 Inner peripheral wall of detent pipe 29 Holding member 30 Presser projection

Claims (10)

(57) [Claims] Claims: 1. A filter for a pipeline comprising a filter element which is arranged in a pipeline and substantially completely covers an outlet of the pipeline, the filter element comprising a filter element of the pipeline. It consists of a loop-shaped elastic support frame having a peripheral shape conforming to the shape, and a flexible filter medium carried on the support frame over the entire circumference, and is inserted into the pipeline through an opening provided in the peripheral wall of the pipeline. When the filter element is deformed along the inner surface of the flow opening, a plug for closing the opening of the pipe is attached to the outer edge of the support frame while the filter element is arranged in the pipe. A filter for a pipeline characterized by being used. 2. The pipeline according to claim 1, wherein the elastic supporting frame comprises a loop-shaped steel frame and a flexible rubber or plastic strip fixed to an outer peripheral surface of the frame. Filter for 3. The elastic support frame expands in a substantially circular shape in a natural state without receiving an external force.
2. A filter for a pipeline according to 1.). 4. The filter for a pipeline according to claim 2, wherein the strip has a V-shaped cut extending in the circumferential direction outward. 5. The pipe according to claim 2, wherein a projection is provided on an outer peripheral surface of the strip to abut against an inner peripheral wall of the pipe to prevent displacement. filter. 6. A stopper member is fixed to the plug or the support frame via a connecting rod, and the stopper member is provided outside the conduit when the filter element is inserted into the conduit. The pipe filter according to any one of claims 1 to 5, wherein the filter is adapted to be fitted into the arranged detent pipe so as to be relatively non-rotatable. 7. The filter for a pipeline according to claim 6, wherein an operation rod for inserting the filter element into the pipeline or pulling out the filter element from the pipeline can be attached to the detent member. 8. The filter for a pipeline according to claim 7, wherein the operation rod is guided by a guide means attachable to the detent pipe. 9. The filter for a pipeline according to claim 6, wherein a pressing member for holding the detent member can be attached to the detent tube. 10. The filter for a pipeline according to claim 6, wherein the detent pipe is fixed to the pipeline via a connecting saddle.