JPS6350546Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is used as a joint for connecting pipes in water pipes, etc., and particularly relates to a joint that can expand and contract at the joint.

Various types of expansion joints have been used, but none of them are fully satisfactory in terms of complete water-tightness and easy adjustment of expansion and contraction strength. In other words, since the adjustment mechanism involved in expansion and contraction is the point that presses the waterproof packing,
If the pressure is strong enough, the water stop and brake will work strongly, but if the pressure is weakened, the packing that is released from tightening will be deformed by the water pressure, causing water leakage.

In such a conventional structure, the part where the packing or O-ring is located is a part with a tapered surface on the inside edge of the joint body, and is compressed and deformed by pressing against the tapered surface to stop water. It also performs expansion and contraction brakes. Therefore, the packing is constantly pushed outward by the internal water pressure, and as it moves outward, it easily loosens and water leaks are likely to occur.

The present invention was developed in view of the above circumstances, and its purpose is to relate to an expansion joint that can arbitrarily adjust the expansion and contraction resistance of a union socket regardless of the water-stop packing or O-ring. .

The present invention will be described in detail below with reference to the illustrated embodiments. Reference numeral 1 denotes an expansion joint body, and a union socket 2 is slidably inserted and attached to one end of the body. At the end of the joint body 1 to which the union socket is attached, a step 3 is formed on the inside and a thread 4 is formed on the outside. A threaded portion 5 is provided on the inside of the other end of the joint body, and a stopper piece 6 that projects inward in a ring shape is integrally formed.

A ring-shaped stopper 7 projecting outward is integrally formed on the outer surface of the insertion side edge of the union socket 2.

In connecting the joint body 1 and the union socket 2, a pair of stopper rings 8, 9 and a packing or an O-ring 10 made of the stopper rings are fitted in advance on the union socket side. Tapered surface 11a on the surface
When connected to the joint body, the pair of stopper rings 8, 9 and the O-ring 10 fit into the stepped portion 3, and the brake ring 11 is attached to the edge of the joint body. Make sure they touch each other. Then, the tapered surface 11a of the brake ring is brought into contact with the cap nut 12, and the cap nut 12 is screwed onto the thread 4, and by tightening and loosening the cap nut, the brake ring 11 and the outer peripheral surface of the union socket 2 are brought into contact with each other. The contact pressure, that is, the braking force, can be adjusted.

The brake ring 11 shown in Fig. 3 is used as the brake ring, but it is in the shape of a split ring with a cut-off part 11b, and there is a limit to the degree of tightening depending on the interval between the cut-off parts. It's like this.
Furthermore, the shape of the brake ring 11 is such that, as shown in FIG. 4, a flange portion 11c is provided at the portion that abuts against the joint body to improve the stability of the abutment and the strength of the brake ring itself.

The expansion joint of the present invention configured in this way includes a pair of stopper rings 8 and 9 as well as an O-ring 1.
0 is stored in the step 3 inside the joint body, and the O is stored between the union socket 2 and the joint body 1.
Even if the ring 10 is held in a pressed state and water pressure is applied from the inside, the O-ring 10 is only biased toward the stopper ring 9 located on the outside, and no water leaks. In particular, even if the water pressure becomes high, the pressing pressure of the O-ring against the stopper ring 9 increases and the deformation occurs in the water-stopping direction, so the water-stopping effect increases and water leakage does not occur.

The degree of friction caused by the expansion and contraction of the union socket 2, i.e., the degree of braking, is adjusted by the degree to which the brake ring 11 is pressed against the outer circumferential surface of the union socket 2. In other words, when the cap nut 12 is tightened,
The tapered surface 11a of the brake ring 11 acts to reduce the diameter of the brake ring, and as the brake ring reduces in diameter, the contact pressure with the union socket 2 increases, acting as a brake and restricting the expansion and contraction of the union socket.
When laying water pipes, a water pressure test is performed after the water pipes are connected to check for water leaks, etc. The water pressure applied at this time is 17.5 kg/ ^cm2 , and it is sufficient if the brake is applied so that it does not expand at this level of water pressure. Therefore, the cap nut 12 is tightened to adjust the contact pressure of the brake ring 11 against the union socket so that it expands and contracts at 20 to 25 kg/ ^cm2 . This can be done by experimentally calculating the tightening strength and tightening with a tool such as a torque wrench. Even if the brake ring 11 is tightened in this way, it does not affect the O-ring 10, so there is no change in the water-stopping effect, etc.

As explained above, the expansion joint according to the present invention is
Since the union socket is connected via the cap nut and brake ring, the diameter of the brake ring is reduced by tightening the cap nut, thereby adjusting the contact pressure with the union socket as desired. This provides an excellent effect in that the braking force for expansion and contraction can be adjusted to a predetermined value.

Furthermore, since the braking force is adjusted by reducing the diameter of the brake ring, it has nothing to do with water-stop gaskets or O-rings. Since the ring is sandwiched, even if the water pressure from the inside increases, only a pressing action is applied to the outside stopper ring, which has the effect of further increasing the water-stopping effect without water leakage.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a part of the expansion joint according to the present invention in cross section, Fig. 2 is an enlarged sectional view of the main part of the expansion joint, and Fig. 3 is a brake ring used in the expansion joint. FIG. 4 is a perspective view of a brake ring according to another embodiment. 1...Joint body, 2...Union socket, 3
...Stepped part, 4...Threaded part, 5...Threaded part, 6...
Stopper piece, 7... Stopper, 8, 9... Stopper ring, 10... O ring, 11... Brake ring, 11a... Tapered surface, 12...
Fukuro Natsuto.

Claims (1)

[Scope of utility model registration request] In a pipe joint in which a union socket is slidably inserted into one end of a joint body, a step is formed on the inside of the one end and a thread is formed on the outside, and the union socket A stopper that projects outward is integrally formed on the insertion edge of the
A pair of stopper rings and an O-ring sandwiched between the stopper rings are disposed in the stepped portion so that the stopper engages with the brake ring, and the brake ring can be reduced in diameter by abutting against the end of the joint body. An expansion joint characterized in that the brake ring is configured to be tightened with an appropriate tightening pressure by a cap nut screwed onto the outer thread.