JPH0237014Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a seal ring that is interposed for fluid sealing when connecting pipe bodies. Belongs to a field.

(Prior art) Conventionally, a seal when connecting pipes is achieved by interposing a packing between the flanges of the two pipes to be connected, by attaching a packing to the inside of a tightening bag nut, or by attaching a packing to the connecting end of the pipes. Measures such as fitting cylindrical packing have been adopted.

(Problems to be solved by invention) However, when inserting packing between the flanges or inserting packing inside a cap nut, a method that can be adopted for a pipe body having flanges or annular protrusions Therefore, it cannot be used to connect a tube body with a male thread provided on the outer circumferential wall of the tube body. In addition, when a cylindrical packing is fitted to the connecting end of the pipe, not only is the end face and threaded part not necessarily completely watertight, but the effective cross-sectional area of the pipe is limited by the cylindrical packing. There were problems such as restrictions. Particularly in lining steel pipes and the like, there has been no effective means for preventing rust from occurring in the threaded portions.

(Means for solving the problem) However, this invention is a ring in which a sealing material is integrally coated on the outer circumferential side and end face of a reinforcing core ring, and on the outer circumferential side of the ring, a pipe female is attached. A seal ring provided with a male thread that is screwed into the threaded portion was proposed for connection to a pipe body, thereby solving the above-mentioned conventional problems. The reinforcing core ring is, for example,
It can be made of non-rusting metal such as brass or stainless steel, or made of hard resin such as nylon or Bakelite. Usually, rubber or Teflon is suitable as the sealing material, but any material having appropriate elasticity and toughness can be used. However, the material must be highly resistant to the fluid flowing inside the tube. The seal ring of this invention can be used in various pipe connections, such as valves, elbows, sockets, and other pipe fittings.

Since the seal ring of this invention is screwed into the female thread of the tube body, it needs to be hooked to a rotational force application tool used when screwing it in. For example, as in the embodiment, protrusions may be provided symmetrically or grooves or recesses may be provided, but other known structures for locking this type of ring and the rotational force applying device may be used.

(Efficacy of the invention) This invention has a sealing material applied to the threaded part and the end face, so it not only seals the contact part with the end face of the pipe to be connected, but also seals the threaded part with the female thread part. I will do it. Therefore, the threaded portion of the pipe to be connected (for example, a lining steel pipe) is reliably sealed from the fluid passing through the pipe.

Furthermore, in use, since the tube to be connected is screwed in after being screwed in in advance, it serves as a stopper and can prevent the end of the tube from entering abnormally due to over-tightening.

(Example 1) In FIGS. 1 and 2, a seal ring 5 is constructed by baking and depositing rubber layers 3 and 4 on the outer circumferential side and end surface of a reinforcing core ring 1 made of brass having a screw 2 on the outer circumferential side wall. do. In the figure, numerals 6 and 6 are projections provided diametrically symmetrically on the inner circumferential side of the reinforcing core ring 1, and are used to engage a rotational force applying device.

(Example 2) In FIGS. 3 and 4, Teflon (registered trademark) layers 8 and 9 are molded and adhered to the outer peripheral side and end surface of the stainless steel reinforcing core ring 7, and the Teflon layers 8 and 9 are The seal ring 12 is constructed by providing a screw 10 on the outer circumferential side of the seal ring 12.
Reference numeral 11 indicates a groove for engaging the rotational force applying device.

This example differs from Example 1 in that the reinforcing core ring is not provided with a screw, but if the sealing material is strong enough to withstand tightening, it is not necessarily necessary to provide a screw with the reinforcing core ring. do not have.

(Example 3) In FIG. 5, rubber layers 3 and 4 are molded and adhered to the outer circumferential side and end face of a reinforcing core ring 7 made of stainless steel, and the inner circumferential side of the rubber layer 4 adhered to the end face is thickened. The seal ring 13 is provided with an annular convex portion 4a as a thickness.
It is composed of

The annular convex portion 4a is provided to prevent the rubber layer 4 from coming into contact with a burr 15 (see FIG. 8) generated at the end of the lining steel pipe 14 by thread cutting. Therefore, it is preferable that the protrusion height of the annular convex portion is equal to or greater than the protrusion length of the burr 15 (usually about 15 mm). For example, if the protrusion height is 1.5 mm, the interference can be set to 0.5 mm, which is the difference from the burr protrusion of 1 mm.

According to this embodiment, there is no risk that the rubber layer 4 will be damaged by the burr 15 of the lining steel pipe 14.

(Usage Example 1) Figures 6 to 8 show the case where the seal ring of this invention is used in a valve.

That is, in FIGS. 6 and 7, the seal ring 5 is screwed onto the inside of the connecting pipe 17 of the valve casing 16, and then the lining steel pipe 14 is screwed onto the inside, where 18 is the lining and 19 is the valve. 20 is a valve stem. In the above, since the seal ring 5 serves as a stopper, there is no risk that the end of the steel pipe will be screwed in excessively and reach the valve seat and damage it.

Next, FIG. 8 shows a case in which the seal ring 13 shown in Example 3 is used in place of the seal ring 5. In this usage example, the lining steel pipe 14
The inner circumferential side of the end surface is in contact with the annular convex portion 4a of the rubber layer 4, and the outer circumferential side of the end surface of the lining steel pipe 14 and the rubber layer 4
A gap 21 is formed between them. Even if a burr 15 exists on the end face of the lining steel pipe 14, the burr 15 will be contained within the gap 21. Therefore, there is no risk that the rubber layer 4 will be damaged by the burrs 15.

(Usage Example 2) Figure 9 shows a case where the seal ring of this invention is used in an elbow.

That is, a seal ring 5 is installed inside one side of the elbow 22.
are screwed together, and then a lining steel pipe 23 is screwed together.

In the above usage example, the seal ring seals both the end faces and threaded portions of the lining steel pipes 14 and 23, so there is no risk that the fluid passing through the steel pipes will come into contact with the end faces and threaded portions.

(Effect of the invention) According to this invention, the sealing material is applied to the outer periphery of the reinforcing core ring, and a screw is provided, so that the female thread is first screwed into the inside of the tube connection part, and then the male screw tube is inserted. When the bodies are screwed together and tightened, the screws of the female threaded tube body and the screws of the seal ring will be screwed together airtightly, and
Since the end face of the seal ring and the end face of the male threaded tube body come into airtight contact, there is an effect that the end face of the male threaded tube body and the threaded portion can be reliably sealed from the fluid flowing inside the tube body. Therefore, even when a lining steel pipe is used, there is no fear that the threaded portion or end face will rust.

Furthermore, when used in a pipe joint, the seal ring acts as a stopper and has the effect of preventing excessive tightening of the pipe bodies to be connected.

[Brief explanation of drawings]

Fig. 1 is an enlarged front view of Embodiment 1 of this invention, Fig. 2 is an enlarged sectional view, Fig. 3 is an enlarged sectional view of Embodiment 2, Fig. 4 is an enlarged front view, and Fig. 5 is an enlarged sectional view of Embodiment 1. Similarly, FIG. 6 is an enlarged sectional view of Example 3, FIG. 6 is a partial sectional view showing the case where the seal ring of this invention is used in a valve, FIG. 7 is an enlarged partial sectional view of FIG. 6, and FIG. Similarly, FIG. 9 is a partial cross-sectional enlarged view showing the case where the seal ring of Example 3 is used, and FIG. 9 is a partial cross-sectional view showing the case where it is also used in an elbow. 1... Reinforcement core ring, 3, 4... Rubber layer, 4a
... Annular convex portion, 5 ... Seal ring, 6 ... Protrusion, 7 ... Reinforcement core ring, 8, 9 ... Teflon layer, 11 ... Hanging layer, 12, 13 ... Seal ring.

Claims (1)

[Claims for Utility Model Registration] 1. A seal ring in which a sealing material is applied to the outer circumferential side and end face of a reinforcing core ring, and a male thread is provided on the outer circumferential side of the ring to be screwed into the female threaded part of the tube body. . 2. The seal ring according to claim 1, wherein the reinforcing core ring is made of brass or stainless steel. 3. The seal ring according to claim 1, wherein the sealing material is rubber or Teflon (registered trademark). 4. The seal ring according to claim 1, wherein the pipe body is a valve, elbow, socket, or pipe joint.