JPS5827433B2 - pipe joint - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pipe joint of a new structure particularly suitable for ceramic pipes.

Ceramic tubes are allowed to have a dimensional error of ±4 mm even in JIS standards, and it is difficult to connect such inaccurate tubes, so various shapes have been devised over the years, but none of them have sufficient performance. This often caused water to leak from the joints.

In particular, conventional pipe joints are useless when the rubber seal is deformed by high water pressure or the contact point with the twisted inner pipe is damaged. The reality was that only one cold was reported.

In order to eliminate the above-mentioned drawbacks, the inventor of the present invention has conducted extensive research into rubber packing O that is resistant to deformation and damage.
The inventors discovered that it is sufficient to fix a rubber gasket, which has two lips and is covered with a frame at specific locations, to the inside of the socket of the tube, and thus completed the present invention.

A first lip is provided at the inner tip of the cylindrical portion, a second lip is provided at the inner end, and a first lip is provided between the first lip and the second lip.
A plurality of lip fixing grooves are provided, a contact piece is provided protruding from the first lip tip on the opposite side of the second lip to be pressed against the first lip fixing groove when the first lip is bent, and a flange is provided at the tip of the cylindrical portion. A rubber gasket is provided, and a frame is placed over the flange, so that the cylindrical portion can be fitted inside one of the tube socket portions, and the tip of another tube can be fitted inside the cylindrical portion. This is a pipe joint that is characterized by:

The present invention will be explained in detail below along with embodiments shown in the drawings.
It has a removable first lip 2 and a replaceable second lip 3 in this order from the distal end side.

A contact piece 9 is provided at the tip of the first lip 2 almost perpendicularly to the first lip 2, and a contact piece 9 is provided between the first lip 2 and the second lip 3 inside the cylinder 1. A large number of fixing grooves 8 are bored.

A plurality of anti-slip protrusions 10 are provided on the outside of the cylindrical portion 1 near the second lip 3.

A locking pawl 11.12 is formed integrally with the flange 4 at the tip of the cylindrical portion 1, and the frame 5 is hooked onto this pawl 1L12 to cover the flange 4.

The frame 5 is made of hard plastic, metal, or the like.

In the pipe joint configured in this manner, the narrow diameter portion of the cylinder 1 is fitted inside the socket portion 13 while the collar portion 4 is brought into contact with the tip end side of the tube.

At this time, several grooves are provided inside the socket part 13,
It is preferable that the anti-slip protrusion 10 be engaged with the protrusion 10, as this will result in a more secure fit.

For fitting inside the socket part T, it may be fixed using an adhesive, but if adhesive is used, it is likely to cause problems with airtightness during the period of use, so it is recommended to fix it by baking it inside the socket part 7. Good.

When another pipe 14 is inserted into the pipe joint constructed as described above, the first lip 2 and the second lip 3 are bent toward the base of the pipe 15 while being in contact with the other pipe 14.

As described above, since the front joint of this example is in contact with the pipe 14 in two stages through the two lips 2 and 3, water will not leak even if one of the lips is damaged.

Further, the contact piece 9 at the tip of the first lip 2 strongly contacts the first lip fixing groove 8 and is fixed there.

Therefore, the 11th J-tube 2 is tightened more strongly at this point and exerts a pressure P on the inner pipe 14.

That is, during use, the first lip 2 is expanded and curved by the tube inserted into the front joint, and the contact piece 9 at the tip is pressed against the first lip fixing groove 8.
At that point, the bending resistance increases, and since the intermediate portion between the base of the first lip 2, which is curved in an arcuate shape in cross section, and the contact piece 9 has elasticity, the tube can be elastically deformed in the radial direction, and the tube is bent. vinegar.

As a result, the outer periphery of the pipes to be joined can be strongly tightened to completely prevent liquid leakage, and since the intermediate portion of the first lip 2 presses against the outer periphery of the pipe in an elastically deformable state, it can be used for a long period of time. Unlike conventional rubber gaskets, it does not deform and cause leaks.

Furthermore, even after the contact piece 9 is pressed against the first lip fixing groove 8, the middle part of the first lip 2 can be elastically deformed in the radial direction of the pipe, so that it can withstand variations in the outer diameter of the pipes to be joined. It has the advantage of being highly adaptable.

In particular, ceramic tubes and humid tubes have large dimensional errors (variations) in their outer diameters, so these can be suitably used.

Since the frame 5 covers the bent flange 4I, even if the inner tube 14 is strongly inserted and the first lip 2 and the second lip 3 are bent strongly, the flange 4 will not deform accordingly. It is always in contact with the tip of the socket part 7 in its 1D shape.

Therefore, unlike conventional rubber gaskets, it does not deform and cause water leakage during long-term use.

As described above, in the front joint of the present invention, the rubber packing is provided with a first lip and a second lip, a first lip fixing groove is formed between them, and a first lip fixing groove is formed at the tip of the first lip to fix the first lip when bent. Since the contact piece that can come into contact with the groove is provided protrudingly, when the first lip is expanded and curved during use, the contact piece
The intermediate part between the base of the 11th J-tube and the contact piece that is pressed against the lip fixing groove can be elastically deformed in the radial direction, increasing the clamping force of the tube, preventing liquid leakage, and adapting to variations in the outside diameter of the tube. It also has a larger capacity and does not deform or leak like conventional rubber gaskets, even after long-term use.

Moreover, since the flange is covered with a frame, it is durable against deformation and breakage of the gasket.

By bending the folded lip, even pipes with slight dimensional errors can be absorbed and joined.

The front joint of the present invention is suitable for joining ceramic pipes, but it can also be applied to concrete pipes, humid pipes, etc.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing the packing used in the front joint of the present invention, Fig. 2 is a front view of the same, Fig. 3 is a side view of the same, and Fig. 4 is an enlarged sectional view showing the main parts of the packing. FIG. 5 is a front view showing a frame placed on the packing, FIG. 6 is a cross-sectional view showing the front joint of the present invention, and FIG. 7 is a cross-sectional view showing the front joint of the present invention in use. 1... Cylindrical part, 2... First lip, 3
...Second lip, 4...Trim section, 5...
...Frame, 6...Compatzkin, 7...
...Socket part, 8...First lip fixing groove, 9
...Contact piece, 10...Slip prevention protrusion, 14.15...Pipe.

Claims (1)

[Claims] 1 A first lip is provided at the inner tip of the cylindrical part, a second lip is provided at the inner end, and a plurality of first lip fixing grooves are provided between the first lip and the second lip, and the first lip is fixed at the tip of the first lip. A rubber packing having a contact piece that is pressed against the first lip fixing groove when the 11th J tube is bent is protrudingly provided on the opposite side of the second lip, and a flange provided at the tip of the cylindrical portion, and a frame that covers the flange. A pipe joint, characterized in that the cylindrical part is fitted inside one pipe socket part, and the tip of another pipe can be fitted inside the cylindrical part.