JPH0215111Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a blind plug used to close the opening of piping such as a hose or pipe.

For example, as a blind stopper of this kind,
As shown in the publication, an outer cylinder is provided on the outer periphery of a plug body that closes the opening of the pipe, a tube insertion gap is formed between the plug body and the outer cylinder, and a tube insertion gap is formed in this tube insertion gap. It is known that the open end of the tube is inserted and the inner and outer walls of the tube are elastically sandwiched between the stopper body and the outer cylinder.

However, in such conventional blind plugs, the pipe is simply clamped between the plug body and the outer cylinder, and the sealing performance is poor, so gas inside the pipe may leak or leaks may occur from outside into the pipe. In addition, since the blind plug easily comes off from the pipe, problems such as the blind plug disappearing during transportation have occurred.

Therefore, the objective of this invention was to provide a blind plug for piping that has sufficient sealing performance and retaining performance.The main feature of this design is that an outer cylinder is attached to the outer periphery of the plug body that closes the opening of the pipe. In a blind plug for piping, in which a pipe insertion gap is formed between the plug main body and the outer cylinder, and the open end of the pipe is inserted into the pipe insertion gap, the outer peripheral wall of the plug main body and the inner peripheral wall of the outer cylinder Annular protrusions are formed at shifted positions on the outer periphery of the tube, and a holding groove for holding down an O-ring attached to the outer periphery of the tube is formed in the outer cylinder. Therefore, the annular protrusions located on the inner and outer walls of the tube are shifted in the axial direction of the tube, so that a force is applied to the tube in the direction of bending the tube inward using one of the annular protrusions as a fulcrum. Therefore, the reaction force strengthens the connection and improves the retaining performance, and the reaction force applied to the outer cylinder increases the pressing force against the O-ring attached to the tube.
The sealing performance is improved and the above object can be achieved.

Examples of this invention will be described below with reference to the drawings.

An embodiment of this invention is shown in FIGS. 1 and 2, and a blind plug 1 for piping according to this invention is made of a material having a certain elasticity such as synthetic resin, and includes a plug body 2 and an outer cylinder 3. and has.

The plug body 2 has a cylindrical shape with a bottom, and is inserted into the opening of the tube 5 from the bottomed part of the plug body 2.
The opening is blocked. Further, the outer cylinder 3 is provided so as to wrap around the outer periphery of the stopper main body 2, and the outer cylinder 3
One end is connected to the outer circumferential wall 4 of the plug body 2, and the other end extends in the insertion direction of the plug body 2, forming a tube insertion gap 6 between the plug body 2 and the outer cylinder 3. The open end of the tube 5 is inserted into the insertion gap 6.

Annular protrusions 8 and 9 are formed on the outer circumferential wall 4 of the stopper body 2 and the inner circumferential wall 7 of the outer tube 3, respectively. In this embodiment, the annular protrusion 8 of the stopper body 2 fits inside the lace processing part 10 formed in the tube 5, while the annular protrusion 9 of the outer cylinder 3 fits inside the lace processing part 10 formed in the tube 5.
The annular protrusions 8, 9 are crushed by contacting the outer peripheral wall of
As a result, a force is applied to the tube 5 in the direction of bending the pipe 5 inward from the annular protrusion 9 using the annular protrusion 8 as a fulcrum, so that the reaction force strengthens the connection.

Further, the outer cylinder 3 is expanded one step slightly before the tip, and a presser groove 12 is provided inside the expanded portion.
is formed. Then, an O-ring 11 is attached to the outer periphery of the tube 5 in advance with this holding groove portion 12.
One side of the O-ring 11 is held down, and the other side of the O-ring 11 is held down by the threaded part 10 of the tube 5, sealing the peripheral portion of the O-ring 11. In that case, the outer cylinder 3
The pressing force on the O-ring 11 increases due to the reaction force from the cylinder 5.

In order to insert the blind plug 1 for piping constructed as described above into the pipe 5, first, the opening of the pipe insertion gap 6 of the blind plug 1 is opposed to the open end of the pipe 5, and then the pipe insertion gap 6 is inserted into the pipe 5. When the part 6 is forcefully inserted into the tube 5, the annular protrusion 8 of the stopper body 2 reaches the inside of the corded part 10 of the tube 5 and is fitted, and the O-ring 11 previously attached to the outer periphery of the tube 5 is inserted. is pressed between the holding groove part 12 and the string drawing part 10.

According to this embodiment, the annular protrusion 8 of the plug body 2 is fitted inside the string-drawing part 10 of the tube 5, so compared to simply crushing the annular protrusion 8. It can be made more difficult to escape.

3 and 4, another embodiment of this invention is shown, which differs from the previous embodiment in the following points.

First of all, in that embodiment, the plug body 2
The annular protrusions 8 and 9 of both the outer cylinder 3 and the outer cylinder 3 are crushed by the tube 5. Second, the tip portion of the outer cylinder 3 is widened into a tapered shape to form a flange contact portion 17, and this flange contact portion 17 is connected to the flange processing portion 16 of the pipe 5.
It is pressed against the annular projection 9 of the outer cylinder 3 as a fulcrum. Since a force is applied to the annular protrusion 9 in the direction of outward expansion, a force that tends to contract inward is applied to the periphery of the tip of the flange contact portion 17, and as a result, the flange contact portion 17 contacts the flange processing portion 16 of the pipe 5. This ensures close contact and further improves sealing performance.

In addition, in the above two embodiments, the processing section 10 of the pipe 5,
The design has been changed to accommodate the differences between the 16 models, and the basic functions and effects are the same.

As described above, according to this invention, the annular protrusions are formed on the stopper body and the outer cylinder at different positions, and the annular protrusions are used to clamp the inner and outer walls of the tube at appropriate distances. In order to apply pressure, a bending force is applied to the tube, so the reaction force strengthens the connection and improves the ability to prevent it from coming off, and the reaction force applied to the outer cylinder also reduces the O This increases the pressing force against the ring and improves sealing performance. Further, since the closing operation is completed simply by inserting the tube insertion gap into the open end of the tube, the operation is easy.

[Brief explanation of the drawing]

Fig. 1 is a half-sectional view showing a blind plug for piping according to an embodiment of this invention, Fig. 2 is a sectional view showing the blind plug for piping according to the above, inserted into a pipe, and Fig. 3 is a half-sectional view of the blind plug for piping according to an embodiment of this invention. FIG. 4 is a cross-sectional view showing a blind plug for piping according to another embodiment, and FIG. 1...Blind plug for piping, 2...Blug body, 3...Outer cylinder, 4...Outer peripheral wall, 5...Pipe, 6...Pipe insertion gap, 7...Inner peripheral wall, 8, 9... Annular process, 11...
...O-ring, 12...pressing groove.

Claims (1)

[Scope of utility model registration request] An outer cylinder 3 is attached to the outer periphery of the plug body 2 that closes the opening of the pipe.
In the blind plug 1 for piping, in which a pipe insertion gap 6 is formed between the plug body 2 and the outer cylinder 3, and the open end of the pipe is inserted into the pipe insertion gap 6, the outer periphery of the plug body 2 is Annular protrusions 8 and 9 are formed on the wall 4 and the inner circumferential wall 7 of the outer cylinder 3 at offset positions, respectively, and a holding groove 12 for holding down the O-ring 11 attached to the outer periphery of the tube is formed on the outer cylinder 3. A blind stopper for piping characterized by the fact that it is formed.