JPS637737Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a ball valve with a strainer, and more specifically, the present invention relates to a ball valve with a strainer, and more specifically, to remove foreign matter in a fluid collected by a filter element constituting a strainer. This invention relates to a ball valve with a strainer that has the function of keeping the over area of the filter element constant over a long period of time by separating it from the over chamber of the filter element, and prevents fluid from flowing out when the filter element is removed. be.

(Prior art) Strainers, which are conventionally installed in front of valves, circulation pumps, etc. and used for the purpose of removing foreign matter from the fluid such as sand and iron chips in the pipeline, are installed on the side of the main pipe. A Y-type strainer, in which a filter element is inserted through a branch pipe connected to a proper location, is common. However, the Y-type strainer does not have a mechanism to close the flow of fluid, so when cleaning, repairing, or replacing the filter element, first close the valves installed before and after the Y-type strainer. There was a problem in that the filter element could not be removed until after the filter element had been removed.

As a solution to this problem, a "strainer with a fluid outflow prevention device" is disclosed in Japanese Utility Model Publication No. 56-20020. The strainer has a branch pipe diagonally installed at an appropriate location on the side of the main pipe, a cylinder is provided in the branch pipe, and a valve that closes when the cylinder in the branch pipe is removed is installed in the primary flow path of the main pipe. , also the main 2
This is a so-called Y-type strainer with a check valve provided in the next flow path. However, the Y-type strainer
Although it has the advantage that the fluid does not flow out even if the overtube is removed, the fluid pressure loss on the upstream and downstream sides of the Y-type strainer is large, and the structure is complex, so it requires a large number of parts and is difficult to assemble. This method has problems such as being time consuming and increasing manufacturing costs.

The present inventors previously filed a patent application for a ball valve with a strainer as a solution to these problems. (Special Application No. 165818, 1983). The ball valve with a strainer according to the application utilizes a so-called three-way ball valve, and is characterized in that a filter element is attached to the ball and branch pipe portion.

(Problem to be solved by the invention) In the above-mentioned ball valve with a strainer, the filter element is removed from the main body after the ball is rotated to the closed position by the handle. However, the ball valve with a strainer has been used for a long period of time by being installed in the pipeline for fluid transportation. Then, foreign substances in the filtered fluid (referred to as filtration particles) gradually settle in the filter element or become clogged in the mesh, reducing the excess area and impairing fluid flow. It has been found that there is a problem in that fluid pressure loss in the strainer-equipped ball valve increases due to increased resistance.

The present invention has been developed in consideration of the above problems, and its object is to provide a strainer-equipped ball valve which combines the features of the invention in the inventor's earlier application, and which has the function of preventing the sludge trapped in the excess part of the filter element from settling or clogging, and of keeping the excess surface area of the filter element constant for a long period of time.

(Means for Solving the Problems) As a result of various studies in order to solve the problems of the ball valve with a strainer related to the above-mentioned earlier application, the present inventors found that It has been found through experiments that the fluid flowing into the cylindrical filter convects in the vertical direction, washing away impurities clogging the filter and diffusing precipitated impurities.

Therefore, when we installed a sedimentation chamber for the collected waste at the bottom of the filter element, clogging of the filter element was prevented, and the fluid pressure loss of the filter element did not increase over a long period of time and remained almost constant. The present invention was developed based on the discovery that the

That is, the measures taken to solve the problems of the present invention include an inlet flow path and an outlet flow path that share an axis, a branch flow path that intersects with the flow path in a T-shape, and the three flow paths. In a ball valve equipped with a ball having a substantially T-shaped through hole communicating with the inside,
A filter element consisting of a plate filter and a cylindrical filter following the plate filter is installed in the ball and the branch pipe forming the branch flow path, and the plate filter is connected to the inlet flow path and the outlet flow path. The cylindrical filter and the plate filter are fitted into the inner wall of the ball so as to separate the inlet hole and the outlet hole of the ball communicating with each other, and to divide the branch hole into two, and are located in the branch pipe. At least the upper end of the cylindrical filter is integrated, and the upper end is inserted or fitted into the end of the branched hole of the ball, while the lower end of the cylindrical filter is
It has a settling chamber that communicates only with the overchamber of the cylindrical filter, and is rotatably fixed by a lid detachably attached to the outer end attachment port of the branch pipe. .

The ball valve, which forms the basic structure of the present invention, may be made of metal or plastic, and its material is not particularly limited.

In addition, the structure of the main body may be a union type that holds the ball through a sheet, a type in which the ball holder is attached from both sides or one side, or a type in which the attached state is simply inserted, glued, or screwed. It is not particularly limited.

The strainer section according to the present invention includes a branch pipe forming a branch channel that intersects the inlet channel and the outlet channel of the ball valve body in a T-shape, a filter element installed inside the ball and the branch pipe, and a filter element installed inside the ball and the branch pipe. It is composed of a lid body having a settling chamber to which the lower end of the filter element is rotatably fixed.

The filter element installed in the ball and the branch pipe consists of a plate-shaped filter and a cylindrical filter integrated with the plate-shaped filter,
Both filter portions are integrated at the upper end portion or the upper end portion and the lower end portion of the cylindrical filter by adhesion, welding, concave-convex fitting, integral molding, or the like.

The filter element is mainly composed of a porous or lattice-shaped support and a support attached to the support, and a preferred shape is shown in FIGS. 2 to 4. For example, a cylindrical filter is divided into two at the center and integrated to separate the upstream and downstream sides, or the upper part of the cylindrical filter is a semi-cylindrical part and the lower part is integrated into it. Examples include cylindrical ones.

However, any type of filter may be used as long as it has a structure in which all the fluid flowing in from the upstream side passes through the passage and flows out to the downstream side. In particular, the shape of the cylindrical filter installed in the branch pipe is limited. It is not something that will be done.

Further, the material of the mesh-like portion may be metal, plastic such as polyolefin resin, fluorine resin, or polyamide resin, or a composite thereof, and can be freely selected according to the properties of the fluid. Further, the size of the mesh can be freely selected depending on the size of foreign matter in the fluid.

The plate-shaped filter is provided on the inner wall of the ball so as to separate the inlet hole and the outlet hole of the ball that communicate the inlet flow path and the outlet flow path of the valve body, and to divide the branch hole of the ball into two. It is fitted into a groove or protrusion. This fitting method allows the filter element to rotate together with the ball when the ball is rotated.

On the other hand, at least the portion of the upper end of the cylindrical filter integrated with the plate filter and located in the branch pipe that is upstream of the plate filter (when the valve is open) is open, and the lower end of the branch hole of the ball inserted or fitted into the section. As mentioned above, the branch holes of the ball are divided into two by a plate-shaped filter.
The upstream portion thereof is a passage through which a portion of the upstream fluid is guided to the cylindrical filter.
On the other hand, its downstream portion serves as a passage for the fluid flowing into the branch pipe and passed through the cylindrical filter to the outlet hole.

Further, the lower end of the cylindrical filter is covered by a lid body which is detachably attached to the outer end attachment port of the branch pipe and has a settling chamber inside that communicates only with the overchamber of the cylindrical filter. The filter element is rotatably fixed so that it does not twist when rotated together with the ball. The fixing method is not particularly limited, but for example, the fixing method may include fixing at the upper end of a hollow cylindrical precipitation chamber provided on the lower side inside the lid.
The lower end of the cylindrical filter is brought into close contact with an annular socket groove having an outer diameter slightly larger than the outer diameter of the cylindrical filter via an annular Teflon sheet, or an annular Teflon sheet and a rubber elastic sheet,
Preferred methods include a method of rotatably fixing.

The precipitation chamber is provided so as to communicate only with the chamber of the cylindrical filter. Here, the overchamber is a hollow chamber provided in the cylindrical filter and surrounded by a frame consisting of the overportion support and the underside. This is where the upstream fluid is passed through first. Although it is necessary to consider the opening area of the upper end opening of the precipitation chamber depending on the shape of the lower end of the cylindrical filter, a circular opening having a diameter comparable to the inner diameter of the cylindrical filter is provided. It is preferable to close the lower end of the cylindrical filter other than the overchamber so that the precipitation chamber communicates only with the overchamber. Since the precipitation chamber is a room for collecting wastes collected by the filter element, it is preferable to make it as large as possible.

The lid may be an integrally molded product or may be constructed by adhering a cylindrical body having a settling chamber to a perforated lid having an annular socket groove, and is not particularly limited. Further, the lid may be provided with a drain for removing waste accumulated in the precipitation chamber. The drain may be removed by any commonly used method such as a plug method or a plug method.

(Function) The function of the ball valve with a strainer of the present invention will be explained based on FIG. 1 showing one embodiment thereof.

When the ball 4 is moved from the closed state to the open state by rotating the handle 14 that is engaged with the ball 4 via the stem 13, the upstream fluid flows through the union inserted and bonded into the valve body 1. 2 flows into the inlet passage 4a of the ball 4 from the inlet channel 2b.

The fluid that has flowed into the inlet hole 4a is passed through the plate filter 5c, and then passes through the outlet hole 4 of the ball 4.
b, and a cylindrical filter 5d that passes through the upstream side of the branch passage hole 4c and is installed in the branch pipe 3.
It is divided into those that flow into the inner overchamber and those that flow into the overchambers. Furthermore, the fluid that has flowed into the cylindrical filter 5d is passed through the passage part 5b of the passage chamber, passes through the downstream side of the branch passage hole 4c, and flows to the outlet passage hole 4b.
The fluids that have merged at the outlet flow path 1b of the valve body 1 flow out.

The foreign matter in the fluid is collected by the plate filter 5c and the ridge 5b of the cylindrical filter, and either adheres to the ridge 5b or descends to the bottom of the cylindrical filter 5d and is further disposed below. It accumulates in the precipitation chamber 11c of the lid 11 provided in the. Further, the waste adhering to the filter section 5b is washed away mainly by the downward flow of the fluid flowing in from the upstream side, and similarly descends and accumulates in the settling chamber 11c. While the fluid is flowing, the above condition continues to be repeated, so the filter element 5
The excess area of the valve body 1 is always kept constant over a long period of time, and an increase in pressure loss on the upstream and downstream sides of the valve body 1 is therefore suppressed for a long time.

If a large amount of waste accumulates in the sedimentation chamber 11c and it becomes necessary to remove it, it can be removed by removing the drain 12 provided at the bottom of the sedimentation chamber 11c and discharging it along with the fluid out of the valve.

In addition, cleaning the filter element 5,
If it becomes necessary to replace the handle 14,
By rotating the ball 4, the ball 4 is moved to the closed state, and then the lid body 11, which is removably attached to the outer end attachment port of the branch pipe 3 and rotatably fixes the filter element 5, is branched. Just remove it from the tube 3 and then take out the filter element 5. That is, filter element 5
can be removed from the valve body 1 without any fluid flowing out.

(Example) Hereinafter, the present invention will be explained in more detail based on the example drawings.

FIG. 1 is a front vertical sectional view of a hard vinyl chloride resin ball valve with a strainer in an open state, showing an embodiment of the present invention.

In the figure, 1 is one end (in the figure, the downstream end)
The pipe connection part 1a and the flow path 1b (in the figure, the outlet flow path,
Hereinafter, it will be referred to as an outlet flow path. ), and a union 2 having a pipe connection part 2a and a flow path 2b (inlet flow path in the figure, hereinafter referred to as inlet flow path) is inserted and adhered to the other end, and a T-shaped The valve body is integrally provided with a branch pipe 3 forming a branch flow path 3a orthogonal to the valve body.

A ball 4 is rotatably mounted in the central valve chamber inside the valve body 1. The ball 4 is
The ball 4 is sandwiched between a seat 6 attached to the side of the union 2 facing the ball 4 and a seat 7 attached to the side of the valve body 1 facing the ball 4. Inside the ball 4, an inlet through hole 4a communicating with the inlet flow passage 2b, an outlet through hole 4b communicating with the outlet flow passage 1b, and a branch through hole 4c communicating with the branch flow passage 3a are formed. These three through holes 4a, 4b, 4c
In order to communicate the three flow paths 2b, 1b, and 3a,
The cross section of the branch through hole 4c is approximately T-shaped. An inverted U-shaped fitting groove 4d is provided inside the ball 4, dividing the branch through hole 4c in half and dividing the inlet through hole 4a and the outlet through hole 4b from the lower end of the branch through hole 4c. An annular cutout groove 4e having an inner diameter larger than the inner diameter of the branch through hole 4c is provided at the lower end of the branch through hole 4c.

5 is installed inside the ball 4 and the branch pipe 3,
This filter element forms a strainer together with the branch pipe 3 and a lid 11 to be described later. The filter element 5 includes a lattice-like support 5a made of hard vinyl chloride resin, and a mesh-like support 5b made of polypropylene resin, which is adhesively sandwiched thereon or bonded to the inner side thereof.
In terms of shape, it is composed of a plate filter 5c and a cylindrical filter 5d.

The plate filter 5c has an inverted U-shaped outer edge, and has an inlet passage hole 4 of a ball 4 that communicates the inlet passage 2b of the union 2 with the outlet passage 1b of the valve body 1.
It is fitted into the inverted U-shaped fitting groove 4d provided on the inner wall of the ball 4 so as to separate the outlet hole 4b from the outlet hole 4b and divide the branched hole 4c of the ball 4 into two. The lower part of the plate-shaped filter 5c extends in the vertical direction, and is fitted and fixed at the upper and lower ends of the cylindrical filter 5d.

The cylindrical filter 5d, which is integrated with the plate filter 5c and located in the branch pipe 3, is formed in a cylindrical shape and includes a lattice-shaped upper part support 5a and an upper part adhered to the inner peripheral surface thereof. 5b. As described above, the lower extension of the plate filter 5c is inserted into the center of the cylindrical filter 5d so as to divide the cylindrical filter 5d into two, and the upper part of the plate filter 5c is inserted into the center of the cylindrical filter 5d. By fitting into the notch 5f provided on the upper end surface of the cylindrical filter 5d, the lower end is fixed in a semicircular shape with a semicircular closing section (blind) 5h provided on the lower end surface of the cylindrical filter 5d. It is fixed and integrated by fitting between the rings 5g.

(See FIGS. 2 and 3) The upper end of the cylindrical filter 5d is open on both sides with the plate filter 5c in the center, while the lower end of the cylindrical filter 5d is open when the valve is open. The upstream portion of 5c is open, and the downstream portion is closed by a closing portion 5h. That is, when the valve of the cylindrical filter 5d is opened, the semi-cylindrical hollow chamber formed by the semi-cylindrical part located on the upstream side and the extension part of the plate-like filter 5c is filled with fluid flowing from the upstream side. 5e.

The upper end of the cylindrical filter 5d is connected to the ball 4.
It is inserted and fitted into an annular notch groove 4e provided at the lower end of the branch passage hole 4c, and the lower end thereof
1 through an annular Teflon sheet 8 and a rubber elastic sheet 9, and is rotatably fixed so as not to twist when rotating together with the ball 4.

Another preferred embodiment of the filter element 5 is shown in FIG. This filter element 5 consists of a cylindrical filter 5d whose upper part is semi-cylindrical and whose lower part is integrally formed into a cylindrical shape, and a plate-shaped filter 5c which is integrated at its upper end. The upper end surface of the semi-cylindrical portion and the lower end surface of the cylindrical portion are open, and the extension surface of the plate filter 5c of the semi-cylindrical portion and the semicircular ceiling portion of the cylindrical portion are open. , the upper part is provided by adhesive.

Reference numeral 11 denotes a lid body made of hard vinyl chloride resin that is screwed onto the outer peripheral part 3b of the outer end attachment port of the branch pipe 3 with an O-ring 10 interposed between it and the lower end surface of the branch pipe 3. be.

An annular groove 11a for mounting the O-ring 10 is provided on the lower side of the female thread provided on the inner peripheral surface of the upper end of the lid body 11, and on the inner peripheral side thereof,
an annular socket groove 11b having a circular opening approximately equal to the inner diameter of the cylindrical filter 5d and having an outer diameter slightly larger than the outer diameter of the cylindrical filter 5d;
is installed protrudingly. An annular Teflon sheet 8 and a rubber elastic sheet 9 are mounted on top of each other in the annular socket groove 11b, and the lower end of the cylindrical filter 5d is tightly fitted in contact with the Teflon sheet 8. . The cylindrical filter 5d has a lid body 1.
1 is screwed onto the outer periphery 3b of the outer end attachment port of the branch pipe 3, and is pressed against the ball 4 at the annular socket groove 11b via the Teflon sheet 8 and the rubber elastic sheet 9. The annular socket groove 1
The reason why the outer diameter of the cylindrical filter 5d is made slightly larger than that of the cylindrical filter 5d is to facilitate the rotation of the cylindrical filter 5d. The purpose of bringing the lower end surfaces into contact is to improve the sliding of the cylindrical filter 5d and also to facilitate rotation.

A hollow cylindrical settling chamber 11c is provided at the bottom of the annular socket groove 11b, communicating with the opening thereof and having an inner diameter larger than the inner diameter of the opening. As shown in FIG. 1, the settling chamber 11c is preferably provided as large as possible, but it may also be formed into a hollow cylindrical shape having the same inner diameter as the opening of the annular socket groove 11b. The precipitation chamber 11c is a chamber in which the waste collected in the filter chamber 5e in the cylindrical filter 5d descends together with the fluid and precipitates,
The waste in the settling chamber 11c is diffused by the fluid, and the possibility of returning to the settling chamber 5e is reduced. A screw hole 11d penetrating to the outside of the lid 11 is provided at the center of the bottom of the settling chamber 11c, into which a drain 12 is screwed.

13 is a stem fitted into an engagement groove provided on the upper part of the ball 4.

14 is a handle that is fitted and fixed to the upper part of the stem 13.

In the ball valve with a strainer of this embodiment, when the ball 4 is opened by rotating the handle 14, the fluid flowing from the upstream pipeline flows through the inlet channel 2b formed by the union 2. It passes through and flows into the inlet hole 4a of the ball 4. The fluid that has flowed into the inlet hole 4a is passed through the passage 5b of the plate-shaped filter 5c, flows out into the outlet passage 4b of the ball 4, and flows into the passage chamber 5e of the cylindrical filter 5d. The branch passage hole 4c of the ball 4 is passed through the passing portion 5b.
and one that flows out to the outlet hole 4b through the downstream side of the outlet hole 4b. The fluid that has flowed into the outlet passage 4b flows through the outlet passage 1b formed by the valve body 1.
and flows into the downstream pipeline.

Plate filter 5c and cylindrical filter 5d
The waste collected in the filter chamber 5e settles with the downward flow of the fluid or by washing the part where the filter part 5b is clogged with the fluid.
The precipitation chamber 11c, which is provided inside the chamber 1 and communicates only with the overchamber 5e, is stored in the precipitation chamber 11c. A downstream portion of the lower end surface of the cylindrical filter 5d is a closed portion 5h.
Since the sedimentation chamber 11c is blocked by the sedimentation chamber 11c, the waste material in the sedimentation chamber 11c will not flow out to the downstream side.

If a large amount of waste accumulates in the settling chamber 11c and it becomes necessary to take it out, the drain 12 can be removed from the lid 11 and taken out together with the fluid. When the filter element 5 needs to be cleaned or replaced, the handle 14 is rotated to close the ball 4 and prevent the upstream and downstream fluids from flowing into the branch pipe 3. Then, the lid 11 is removed from the branch pipe 3 and the filter element 5 is pulled out.

(Effects of the invention) As explained above, the ball valve with a strainer according to the invention has a sedimentation chamber provided in the lid below the filter element, so that foreign matter in the fluid collected by the filter element ( Since the filter element (filtering material) is settled by the flow of fluid and collected in the settling chamber, the filter element's filter element is less likely to be clogged, damage to the filter element is prevented, and the filter element's excess area remains constant for a long time. This also prevents an increase in pressure loss between the upstream and downstream sides of the valve. Therefore, the period of cleaning and replacement of the filter element can be extended.

In addition, it is a highly functional valve with a simple structure that combines all three functions of the primary valve, strainer, and secondary valve that were conventionally required, so you can easily adjust the handle on the spot. Just by rotating, the flow of fluid can be closed, and the filter element can be immediately removed from the valve body without fluid flowing out, making the operation extremely simple and improving work efficiency.

Furthermore, the pressure loss of the fluid is not much different from that of the conventional Y-type strainer, and the distance between the surfaces of the device itself can be reduced, and the structure is simple, so it has the effect of reducing costs.

[Brief explanation of the drawing]

FIG. 1 is a front vertical cross-sectional view showing one embodiment of the ball valve with a strainer of the present invention, and FIGS. 2 and 3 are perspective views from above and below of the filter element in FIG. 1. Figure, 4th
The figure is a perspective view showing another embodiment of the filter element. 1... Valve body, 2... Union, 3... Branch pipe, 4... Ball, 5... Filter element, 5c... Plate filter, 5d... Cylindrical filter, 6, 7... Seat, 8 ... Teflon sheet, 9 ... Rubber elastic sheet, 10 ... O-ring, 11 ... Lid body, 11c ... Sedimentation chamber, 12 ...
Drain drain, 13...Stem, 14...Handle.

Claims (1)

[Claims for Utility Model Registration] 1. An inlet flow path and an outlet flow path that share an axis, a branch flow path that intersects with the flow path in a T-shape, and 3.
In a ball valve equipped with a ball having a substantially T-shaped through hole for communicating a flow path, a plate filter and a cylindrical filter following the ball are disposed inside the ball and in a branch pipe forming a branch flow path. A filter element is installed, and the plate filter divides the inlet hole and the outlet hole of the ball that communicate the inlet flow path and the outlet flow path, and divides the branch hole into two. The cylindrical filter fitted to the inner wall of the ball and located in the branch pipe and the plate filter are integrated at least at the upper end of the cylindrical filter, and the upper end is inserted into the end of the branch passage hole of the ball. On the other hand, the lower end of the cylindrical filter has a settling chamber that communicates only with the overchamber of the cylindrical filter, and is removably attached to the outer end attachment port of the branch pipe. A ball valve with a strainer, which is rotatably fixed with a lid body. 2. The ball valve with a strainer according to claim 1, wherein the lid body is provided with a drain.