JPH041420Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a packing member, and is used for sealing diaphragm valves, ball valves, etc., for example.

(Prior Art) A conventional packing member used, for example, as a sealing member of a diaphragm valve is shown in FIG.

This diaphragm valve has a packing member d attached to the joint end surface c of the upstream opening b of the valve body a, for example.
abutting the joint end surface g of the connecting sleeve e through the
The connecting sleeve e is tightened and fixed to the valve body b using a union nut f.

In this structure, the packing member d is formed with an annular projection i on one end surface h, and the projection i is fitted onto the joint end surface g of the connecting sleeve e, which faces the one end surface h of the packing member d. An annular recess j is formed.

In this way, by creating a structure in which the protrusion i formed on the packing member d and the recess j formed on the connecting sleeve e are fitted together, the sealing effect is enhanced and running water is prevented from penetrating into the joint part. Ensures that no water leaks occur.

(Problems to be Solved by the Invention) However, simply creating a structure in which the protrusion i formed on the packing member d and the recess j formed on the connection sleeve e are fitted together does not provide a sufficient sealing effect. There is a possibility of water leakage.

(Means for Solving the Problem) The packing member of the present invention has been improved to further enhance the sealing effect, and the packing member is connected to the upstream opening and the downstream opening of the valve body using connection sleeves. are connected to each other, and an annular recess is formed in either the joint end surfaces of the connection sleeves or the joint end surfaces of the upstream opening and the downstream opening, and the packing member has the upstream opening and the downstream opening in the center. A flat annular body having an opening having approximately the same diameter as the downstream opening; an annular protrusion that fits into the annular recess is formed on one end surface of the flat annular body; An annular bulge is formed on the other opposing end surface, and the annular protrusion and both end surfaces on the inner diameter side of the annular bulge are formed into tapered surfaces that gradually widen as they go inward; It has a plurality of annular ribs formed on its surface.

(Operation) An annular projection formed on one end surface of the packing member is fitted into an annular recess formed on, for example, the joining end surface of the upstream opening of the valve body or the joining end surface of the connecting sleeve. At this time, the annular bulge formed on the other end surface of the packing member comes into contact with, for example, the joint end surface of the upstream opening of the valve body that does not have an annular recess or the joint end surface of the connection sleeve, and the one side of the packing member Pressed toward the end surface. As a result, the annular protrusion is distorted and further press-fitted into the annular recess, improving the sealing performance between the annular protrusion and the annular recess. Further, both end surfaces on the inner diameter side of the annular protrusion and the annular bulge are tapered surfaces, and the annular ribs are formed on the tapered surfaces, so that the sealing performance of the portion close to the flow path is improved.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

1 to 3 show a packing member 1 of the present invention, and FIG. 4 shows an example in which this packing member 1 is applied to a diaphragm valve.

In FIG. 4, reference numeral 10 denotes a valve body having a flow path 11 therein, and the bottom wall at the center of the flow path 11 is raised upward to form a partition 12 of the flow path 11.
An opening 18 is provided in the ceiling wall portion facing this partition 12.
is formed, and a diaphragm 13 is provided to cover this opening 18 from above. The diaphragm 13 is made of an elastic material such as synthetic rubber or synthetic resin. A connecting tool 14 is buried in the center of the diaphragm 13 with a connecting portion 14a projecting upward, and a connected portion 15a of the compressor 15 is screwed into the connecting portion 14a, thereby connecting the compressor 15 to the diaphragm. . When the valve is closed, the compressor 15 presses the diaphragm 13 against the partition 12, thereby stopping the flow of fluid. In the figure, 16 is a spindle connected to the compressor 15, 17 is a handle, and 19 is a bonnet, which is integrally attached to the valve body 10 with the diaphragm 13 by bolts and nuts 20. .

In the diaphragm valve configured as described above, the packing member 1 of the present invention connects the upstream opening 21 and the downstream opening 22 of the valve body 10 to the connecting sleeve 2.
It is used as a sealing material between 3 and 23. Here, the connection sleeve 23 is a member for connecting a pipe (not shown) to the valve body 10, and a female threaded portion 23a is formed on the inner peripheral wall of the connection sleeve 23, and a female threaded portion 23a is formed on the outer peripheral portion of the pipe. The structure is such that the connection is made by screwing together the male threaded parts. However, connection sleeve 23
The connection between the pipe and the pipe may be achieved by fitting the tip of the pipe into the connection sleeve 23 and gluing this fitted part.

As shown in FIGS. 1 and 2, the packing member 1 has an upstream opening 2 of the valve body 10 in the center.
1 and an opening 2 having approximately the same diameter as the downstream opening 22. An annular protrusion 4 is formed concentrically with the opening 2 on one end surface 3 (upper surface in FIG. 1) of the packing member 1, and the annular projection 4 is formed on the other end surface 5 (lower surface in FIG. 1). An annular bulge 6 is formed in a portion facing the annular protrusion 4 . A cutout surface 4a is formed at the tip end corner (inner corner in this example) of the annular protrusion 4, and this cutout surface 4a facilitates fitting of the connection sleeve 23, which will be described later, into the annular recess 25. At the same time, it is provided to absorb the distortion of the annular projection 4 when it is press-fitted into the annular recess 25 and to improve the adhesion between the annular projection 4 and the annular recess 25. Further, both end surfaces 3, 5 on the inner diameter side of the annular protrusion 4 and the annular bulge 6 are tapered surfaces that gradually widen as they go inward, and a plurality of annular ribs 7, 7... are formed, and a plurality of annular ribs 8, 8, . Furthermore, as shown in FIG.
Support protrusions 9, 9... are provided at the locations. The support protrusions 9, 9, . . . are provided so that the packing member 1 can be supported by fingers when the packing member 1 is interposed between the valve body 10 and the connection sleeve 23. The presence of the supporting protrusions 9, 9, . . . makes it easier to attach the packing member 1. However, the formation of the support protrusions 9, 9...
It is not limited to one location. The packing member 1 may be made of any elastic material, but is preferably made of rubber elastic material. Further, the cross-sectional shape of the annular protrusion 4 may be square, semicircular, or any other shape as long as it maintains good sealing performance.

On the other hand, on the joint end surface 24 of the connection sleeve 23,
An annular protrusion 4 formed on the packing member 1
An annular recess 25 into which the holder is fitted is formed.

Then, the one side end surface 3 of the packing member 1 and the joint end surface 24 of this connection sleeve 23 are brought into contact with each other,
With the annular protrusion 4 of the packing member 1 fitted into the annular recess 25 of the connection sleeve 23, the other end surface 5 of the packing member 1 is brought into contact with the joint end surface 26 of the upstream opening 21 of the valve body 10, The connection sleeve 23 is tightened and fixed to the valve body 10 by a union nut 30.

At this time, the annular bulge 6 of the packing member 1 that is in contact with the joint end surface 26 of the upstream opening 21 is crushed by the tightening of the union nut 30, and the stress is transferred to the annular protrusion provided on the opposite side. 4
The annular protrusion 4 is distorted and the connecting sleeve 2
It will be press-fitted into the annular recess 25 of No. 3. In addition, since both end surfaces on the inner diameter side of the annular protrusion 4 and the annular bulge 6 are tapered, these portions are also crushed from both sides by tightening the cap, and the tapered surfaces are formed on the tapered surfaces. Since the annular ribs 7, 7... are also crushed, the flow path 11
Sealing performance improves in areas close to . Further, since the annular ribs 8, 8, . . . formed on both end surfaces on the outer diameter side of the annular protrusion 4 and the annular bulge 6 are also crushed, the sealing properties of these parts are also improved.

Note that although the above description describes the case where the connection sleeve 23 is joined to the upstream opening 21, the same applies to the case where the connection sleeve 23 is joined to the downstream opening 22, so the explanation is omitted here. ing.

Further, in the above embodiment, the annular recess 25 is formed on the joint end surface 24 of the connection sleeve 23, but an annular recess is formed on the joint end surface 26 of the upstream opening 21, and the annular recess and the packing member 1 are formed. Alternatively, the annular protrusion 4 may be fitted. Furthermore, although the above embodiment shows an example in which the packing member of the present invention is applied to a diaphragm valve, it can also be applied to, for example, a ball valve, and in this case, the same method as in the above embodiment can be performed.

(Effect of the invention) As explained above, according to the packing member of the invention, when the packing member is interposed between the valve body and the connection sleeve, the annular bulge is located on the upstream side that does not have the annular recess. The pressure is applied to the joint end surface of the opening and the downstream opening or the joint end surface of the connection sleeve, and the stress acts on the annular projection, distorting the annular projection and press-fitting it into the annular recess, so that the packing member, the valve body, and Improves sealing performance with the connection sleeve. In addition, both end surfaces on the inner diameter side of the annular protrusion and the annular bulge are tapered surfaces that gradually widen as they go inward, and an annular rib is formed on this tapered surface, so that the end surfaces are closer to the flow path. This improves the sealing performance at certain locations and effectively prevents water leakage.

[Brief explanation of the drawing]

Figures 1 to 3 show the packing member of the present invention, Figure 1 is a partially cutaway front view, Figure 2 is a partially enlarged sectional view, Figure 3 is a plan view, and Figure 4 is a main body. A front view showing a partial cross section of an example in which the packing member of the invention is applied to a diaphragm valve, and FIG. 5 is a partial cross-sectional view showing an example in which a conventional packing member is applied to a valve. 1... Packing member, 3... One side end surface, 4...
...Annular protrusion, 5...Other side end surface, 6...Annular bulge, 7, 8...Annular rib, 9...Support protrusion, 1
0... Valve body, 21... Upstream opening, 22...
Downstream opening, 23... Connection sleeve, 24, 2
6... Joint end surface, 25... Annular recess.

Claims (1)

[Claims for Utility Model Registration] 1. Connecting sleeves are connected to the upstream opening and downstream opening of the valve body through packing members, and the joint end faces of these connecting sleeves or the upstream opening and downstream opening In the valve, the packing member is a flat annular body having an opening in the center having approximately the same diameter as the upstream opening and the downstream opening; An annular protrusion that fits into the annular recess is formed on one end face of the flat annular body, and an annular bulge is formed on the other end face opposite to the annular protrusion, and the annular protrusion and the annular A packing member characterized in that both end surfaces on the inner diameter side of the bulging portion are formed into tapered surfaces that gradually widen as they go inward, and a plurality of annular ribs are formed on the tapered surfaces. 2. The packing member according to claim 1, wherein a plurality of support protrusions are formed on the outer peripheral edge of the packing member.