JPS6353425B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a ball valve with a strainer, and more specifically, a ball valve with a strainer that prevents fluid from flowing out when a filter element constituting the strainer is removed. It concerns valves.

(Prior art) Strainers, which are conventionally installed in front of valves, circulation pumps, etc. and used for the purpose of removing foreign substances such as earth and sand and iron scraps from pipelines, are connected to appropriate places on the side of the main pipe. A Y-type strainer, in which a filter element is inserted through a branched pipe, is common. However, with this type of strainer, when cleaning, repairing, or replacing the filter element, the upstream valve must first be closed to prevent fluid from flowing out, and the valve must be separated. It was very troublesome if it was located in a dry place, and there was a lot of fluid leakage.

Further, if there is no valve on the downstream side of the strainer, there is a problem in that when the filter element is removed, the fluid on the downstream side flows out. Therefore,
In order to prevent fluid from flowing out when removing the filter element, valves were required before and after the strainer, and a total of three devices had to be provided.

A strainer with a fluid outflow prevention device was developed in 1983 to solve these problems.
Disclosed in 20020. The strainer has a branch pipe diagonally installed at an appropriate location on the side of the main pipe, a filter cylinder is provided in the branch pipe, and a valve that closes when the filter cylinder in the branch pipe is removed is installed in the primary flow path of the main pipe. In addition, a check valve is installed in the secondary flow path of the main pipe.

That is, when the filter cylinder in the branch pipe is removed, the valves and check valves provided on the primary and secondary sides of the main pipe operate to prevent fluids on the upstream and downstream sides from flowing into the branch pipe. It is something.

(Problems to be Solved by the Invention) However, the strainer described above has the following problems. In other words, although the strainer is one piece of equipment, it actually consists of two pieces: a valve, a filter cylinder, and a valve, and the strainer is connected to the primary side of the main pipe and It is necessary to install a valve and a check valve in the secondary flow path, which complicates the structure, requires a large number of parts, takes time to assemble, and increases manufacturing costs.

In addition, if the valve or check valve is clogged with foreign matter in the fluid or malfunctions, it will malfunction and will not be able to close the outflow of fluid. Alternatively, downstream fluid may flow out, and in some cases, it may be necessary to visit a remote valve to close it.

Furthermore, since the valves and check valves are installed in the flow path, fluid resistance increases. That is,
Fluid pressure loss on the upstream and downstream sides of the strainer increases.

The present invention has been made in view of the problems of the prior art as described above, and its object is to provide a simple structure consisting of essentially one device that prevents fluid from flowing out when the filter element is removed. An object of the present invention is to provide a ball valve with a strainer.

(Means for Solving the Problems) In view of the problems of the above-mentioned prior art, the present inventors have
As a result of various studies on a simple strainer with a structure that allows the filter element to be easily removed without causing fluid to flow out, we focused on a three-way ball valve with a T-shaped flow path. The inventors have discovered that the above object can be fully achieved by installing a filter element inside a branch pipe that forms a channel, and have thus arrived at the present invention.

That is, in order to solve the problems of the prior art of the present invention, the measures taken 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 In the ball valve equipped with a ball having an approximately T-shaped through hole that communicates the three flow paths, a plate-shaped filter and a branch pipe section following the plate filter are provided inside the ball and within the branch pipe forming the branch flow path. A filter element consisting of a filter is installed, and the plate filter is
The inlet hole and the outlet hole of the ball that communicate the inlet flow path and the outlet flow path are divided, and the branch hole is divided into two.
The branch pipe filter and the plate-shaped filter are integrated at the upper end of the branch pipe filter so that the upstream side and the downstream side are separated by the upper end. and the upper end is inserted or fitted into the end of the branch passage hole, while the lower end of the branch pipe filter is connected to a lid body detachably attached to the outer end attachment port of the branch pipe. It is characterized by being rotatably fixed.

The ball valve forming 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 may be one in which a union or ball holder that holds the ball via a seat is attached to the valve body from both sides or one side, or a type in which the attachment is simply inserted, glued, or screwed. Well, this is also not particularly limited.

The strainer section according to the present invention includes a branch pipe forming a branch channel that intersects in a T-shape with an inlet channel and an outlet channel of a ball valve main body, a filter element installed inside the ball and the branch pipe, and It is comprised of a lid body rotatably fixing the lower end of the filter element.

In the present invention, the term "intersecting in a T-shape" does not necessarily mean perpendicular to the axes of the inlet flow path and the outlet flow path; It means to include.

The filter element installed in the ball and the branch pipe consists of a plate-shaped filter and a branch pipe part filter integrated therein, and both filter parts are bonded, welded, convex-concave fitting, or integrally formed. The filter is integrated at the upper end of the branch pipe filter.

The filter element mainly has a large number of apertures or a grid-like support;
Any type of structure may be used as long as it has a structure in which all the fluid flowing in from the upstream side passes through the port and flows out to the downstream side. In particular, the shape of the branch pipe filter is not limited.

As shown in FIGS. 2 and 3, a preferred shape of the branch pipe filter 5d is such that the upper part of the branch pipe filter 5d is semi-cylindrical, and the lower part is cylindrical and integrated therewith; Alternatively, the entire branch pipe filter 5d may be semi-cylindrical.

Further, the method for attaching the above-mentioned upper part to the upper part support body includes adhesion, welding, etc., but any method may be used as long as it does not come off easily when fluid passes through the upper part.

The material of the above-mentioned part may be metal, plastic such as polyolefin resin, fluorine resin, polyamide resin, or a composite thereof, and can be freely selected according to the properties of the fluid, and the size of the mesh can be selected. It can also be freely selected depending on the size of the 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 to rotate together with the ball when the ball is rotated.

On the other hand, at least the upper end of the branch pipe part filter integrated with the plate filter and located in the branch pipe, at least the part on the upstream side of the plate filter, is open and can be inserted or fitted into the lower end of the branch passage hole of the ball. are combined.

A preferred method of fitting is to provide unevenness on both ends so that the branch pipe filter can also rotate with the rotation of the ball. The branch passage hole of the ball is divided into two by the plate-shaped filter as described above, and the upstream portion thereof is a passage through which a portion of the upstream fluid is guided to the branch pipe filter.

On the other hand, the downstream part flows into the branch pipe,
The branch pipe section provides a passageway for the fluid passed by the filter to the outlet aperture.

In addition, the lower end of the branch pipe filter is rotatably fixed to the outer end attachment port of the branch pipe by a lid removably attached to the outer end of the branch pipe to prevent twisting when the filter element rotates with the ball. There is.

A preferred method for fixing this is to insert the lower end of the branch pipe filter into a socket provided inside the lid through an O-ring. Any method may be used as long as it is fixed.

As can be seen from the above description, the filter element made up of the plate filter and the branch pipe filter is installed so that the upstream side and the downstream side are separated by a section.

Further, the lid may be provided with a drain in order to remove foreign matter in the fluid remaining in the filter element and drain in the branch pipe. The drain may be removed by any commonly used method such as a plug method or a plug method.

A roughly T-shaped ball valve that communicates three flow paths: a ball that is rotatably mounted inside the ball valve body, an inlet flow path and an outlet flow path inside the valve body, and a branch flow path that intersects with the flow path in a T shape. As mentioned above, the plate filter is fitted into the through hole, and the upper end of the branch pipe filter integrated with the plate filter is fitted at the end of the branch passage hole. Inserted or mated.

When the plate-shaped filter is not clogged, the fluid resistance is small, so most of the fluid passes through the plate-shaped filter, and only a small proportion of the fluid flows into the branch pipe filter. However, if the plate filter becomes clogged after a certain amount of use, the proportion of fluid flowing into the branch pipe filter increases.

Here, if the opening area of the downstream part, which is the passage through which the filtered fluid flows to the outlet hole, can be made larger by the branch pipe part filter of the branch passage hole of the ball mentioned above, the pressure of the fluid can be reduced. Although the loss does not increase, if the opening area is not large, the pressure loss will increase, so in that case, a notch is provided in the spherical part of the outer wall of the ball's exit hole in order to reduce the pressure loss. Good too.

The cutout portion is obtained by leaving a portion of the spherical portion in contact with the sealing sheet around the exit hole, and cutting away from the upstream side of the contact portion. The reason for leaving a portion of the spherical portion in contact with the seat is to hold the ball to prevent it from wobbling. By providing the notch, the fluid passed through the cylindrical filter part not only passes through the branch passage hole to the outlet passage hole, but also passes through the notch part and exits through the outlet passage without passing through the branch passage hole. Since it also has a passage leading to the hole, the pressure loss of the fluid is further reduced.

(Operation) By rotating the handle that engages with the ball via the stem, the ball is rotated, and the inlet passage of the valve body and the inlet passage of the ball, and the outlet passage and the outlet passage of the valve body are connected. Once in communication, upstream fluid flows from the inlet channel into the inlet passage.

The fluid flowing into the inlet hole is divided into two types: one is filtered by a plate filter and flows to the outlet hole, and the other is passed by the branch pipe filter and flows through the branch hole to the outlet hole. The divided fluids merge at the outlet hole and flow out into the outlet channel.

The foreign matter in the fluid is separated by the filter element and either adheres to the filter or accumulates at the bottom of the rotatably fixed branch pipe filter.

If a large amount of foreign matter in the fluid is collected in the upper part of the filter element and it becomes necessary to clean it, or if the filter element is damaged and needs to be replaced, by rotating the handle, Move the ball to the closed position, that is, cut off the communication between the inlet channel of the valve body and the inlet hole of the ball, and the outlet channel and the outlet hole, and then attach or detach it to the outer end attachment port of the branch pipe. What is necessary is to remove the lid attached to the branch pipe and rotatably fixing the filter element from the branch pipe, and then take out the filter element.

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

FIG. 1 is a front vertical cross-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 connection with both flow paths is attached. The valve body is integrally provided with a branch pipe 3 forming a branch flow path 3a orthogonal to the valve body.

4 is a ball rotatably supported in the central valve chamber inside the valve body 1; It is held between a sheet 7 attached to the side facing the ball 4. Inside the ball 4, an inlet passage hole 4a communicating with the inlet passage 2b, an outlet passage hole 4b communicating with the outlet passage 1b, and a branch passage hole 4c communicating with the branch passage 3a are formed. Holes 4a, 4b, 4c
In order to connect the three channels 2b, 1b, 3a,
The through hole is approximately T-shaped in cross section. Further, inside the ball 4, an inverted U-shaped fitting groove 4b is provided so as to divide the branch passage hole 4c into two and separate the inlet passage hole 4a and the outlet passage hole 4b from the lower end thereof.
In addition, a concave-convex fitting portion 4e is provided at the lower end of the branch passage hole 4C.
However, a notch 4f is provided at the end of the exit hole 4b, leaving a portion of the contact portion with the sheet 7 intact. (See Figures 4 and 5).

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 described below.

The filter element 5 is composed of a grid-like support 5a made of hard vinyl chloride resin, and a mesh-like support 5b made of polypropylene resin adhesively fixed to the inside thereof, and has a plate-like shape. Filter 5c and branch pipe filter 5d
Both are branch pipe filter 5.
d is integrated by integral molding at the upper end.
(See Figure 2) The plate filter 5c has an inverted U-shaped outer edge, and has an inlet passage 2b and an outlet passage 1b of the valve body 1.
An inverted U is provided on the inner wall of the ball 4 so as to separate the inlet hole 4a and the outlet hole 4b of the ball 4 to be in circular communication, and to divide the branch hole 4c of the ball 4 into two.
It is fitted into a letter-shaped fitting groove 4c.

The branch pipe filter 5d, which is integrated with the plate filter 5c by integral molding and is located in the branch pipe 3, is a cylindrical body having a semi-cylindrical upper part and a cylindrical lower part, both of which are integrally formed. ing.

The upper end of the semi-cylindrical part is open, and the upper peripheral edge thereof is provided with a concave fitting notch 5.
e is fitted into the upstream side portion of the branch passage hole 4c by engaging with the concave-convex fitting portion 4e provided at the end of the branch passage hole 4c of the ball 4.

The semi-cylindrical part, the inner surface of the cylindrical part, and the semicircular ceiling part of the cylindrical part of the branch pipe filter 5d are provided with the above-mentioned bulge part, and the upstream side flowing from the upper end opening of the semi-cylindrical part is provided. All the fluid passes through the hole and flows into the outlet hole 4b of the ball 4.

On the other hand, the lower end of the branch pipe filter 5d, that is, the lower end of the cylindrical portion, is open, and is inserted into a socket 11a provided in the lid 11 via an O-ring 8 and fixed rotatably. has been done.

Furthermore, a circular Teflon flat packing 9 is attached to the bottom of the socket 11a to assist the rotation of the filter element 5.

The lid body 11 has a circular flat packing 14.
The branch pipe 3 is closed by contacting the branch pipe 3, and is screwed to the outer peripheral part 3b of the outer end attachment port, and in the center thereof,
A drain 10 is provided.

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

13 is a handle that is fitted and fixed to the upper part of the stem 12.

In the ball valve with a strainer of this embodiment, when the ball 4 is opened by rotating the handle 13, 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 a filter portion 5b attached to a plate-shaped filter 5c and flows out to the outlet hole 4b of the ball 4. The water is passed through a certain filter portion 5b and is divided into those flowing out to the outlet hole 4b through the downstream side of the branch passage hole 4c of the ball 4 and the notch portion 4f. The fluid that has flowed into the outlet hole 4b flows into the valve body 1.
flows into the outlet flow path 1b formed by the flow path, and flows into the downstream pipeline.

On the other hand, if a large amount of foreign matter in the fluid is collected inside the filter element 5 and the filter element 5 needs to be cleaned or replaced, the handle 13 should be rotated 90 degrees. to close the ball 4 and open the inlet channel 2b-
The communication between the inlet passage hole 4a, the outlet passage 1b and the outlet passage hole 4b is cut off, and then the lid body 11 is removed from the branch pipe 3, and the filter element 5 is pulled out.

Incidentally, when rotating the ball 4, the filter element 5 is connected to the portion where the ball 4 is fitted, that is, the plate filter 5c - the fitting groove 4d, the branch pipe section, the notch 5e at the upper end of the filter 5d, the branch passage hole. 4c
The filter element 5 rotates together with the ball 4 by fitting the concave and convex fitting portions 4e, but the lower end of the filter element 5 also fits into the socket 11a provided in the lid 11.
Since the filter element 5 is rotatably fixed by an O-ring 8 and a flat packing 9 made of Teflon (registered trademark) attached to the filter element 5, the filter element 5 will not be twisted.

(Effects of the Invention) As explained above, the ball valve with a strainer according to the present invention has a structure that combines all three functions of a primary valve, a strainer, and a secondary valve, which were conventionally required, in one valve. It is a simple and highly functional valve. Therefore, the flow of fluid can be closed on the spot by simply rotating the handle, and the filter element can be immediately removed from the valve body without fluid flowing out, making operation extremely simple and greatly improving work efficiency. do.

Further, although the pressure loss of the fluid is almost the same as that of the conventional Y-type strainer, 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 drawings]

FIG. 1 is a front vertical sectional view showing one embodiment of the ball valve with a strainer of the present invention, and FIG.
Perspective view of the filter element in Figure 3
The figure is a perspective view showing another embodiment of the filter element, FIG. 4 is a bottom view of the ball in FIG. 1,
FIG. 5 is a downstream side view of the ball in FIG. 1. 1... Valve body, 2... Union, 3... Branch pipe, 4... Ball, 5... Filter element, 6, 7... Seat, 8... O-ring, 9...
...Teflon packing, 10...Drain drain, 11
... Lid body, 12 ... Stem, 13 ... Handle,
14...Tairapatskin.

Claims (1)

[Claims] 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 a substantially T-shaped through hole that communicates the three flow paths. In the ball valve having a ball inside, a filter element consisting of a plate filter and a branch pipe section filter following the plate filter is installed inside the ball and a branch pipe forming a branch flow path, The filter is fitted into 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, and to divide the branch hole into two parts. and a plate filter are integrated at the upper end of the branch pipe filter so that the upstream side and the downstream side are separated by a cross section, and the upper end is inserted or fitted into the end of the branch passage hole. A ball valve with a strainer, characterized in that the lower end of the branch pipe filter is rotatably fixed by a lid detachably attached to the outer end attachment port of the branch pipe. . 2. The ball valve with a strainer according to claim 1, wherein a notch is provided on the spherical surface of the outer wall of the outlet hole of the ball. 3. The ball valve with a strainer according to claim 1 or 2, characterized in that the lid body is provided with a drain.