JPH0738871U - Detachment prevention fitting - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a separation prevention pipe joint that can minimize expansion and contraction of the joined socket and socket in the axial direction of the pipe, but does not increase water resistance. . [Structure] A ring-shaped liner 11 is provided between the inner end surface 9 of the receiving opening 1 and the tip portion 10 of the insertion opening 7 on the inner periphery of the receiving opening 1, and the inner peripheral surface of the receiving opening 1 and the liner 11 are arranged. A ring-shaped rubber member 12 for centering the liner 11 is arranged between the rubber member 12 and the outer peripheral surface. When the insertion opening 7 tries to move further toward the rear side of the receiving opening than the position where the insertion opening ring 8 of the insertion opening 7 is engaged with the lock ring 5, the tip portion 10 of the insertion opening 7 comes into contact with the liner 11 to regulate the position. Therefore, the expansion and contraction dimension of the receiving opening 1 and the insertion opening 7 can be minimized. Further, since the liner 11 is properly centered and held by the rubber member 12, the liner 11 is prevented from protruding into the flow path, and the resistance of water does not increase.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a separation prevention pipe joint, and more particularly to a slip-on type separation prevention pipe joint in which the receiving port and the insertion port can be joined by inserting the insertion port into the receiving port.

[0002]

[Prior art]

 Slip-on type pipe fittings are constructed so that a sealing material is installed inside the receiving port, and the insertion port is inserted into the receiving port while compressing the sealing material so that the receiving port and the insertion port can be joined. ing. For example, a slip-on type pipe joint that has a slip-prevention prevention function and that can be expanded and contracted by moving the receiving port and insertion port slightly in the axial direction There is one as shown in 3.

A seal material accommodating groove 2 is formed on the inner periphery of the receiving port 1, and an annular seal material 3 is arranged in the seal material accommodating groove 2. Further, a lock ring accommodating groove 4 is formed on the inner side of the seal material accommodating groove 2, and a metal lock ring 5 divided in the circumferential direction is attached to the lock ring accommodating groove 4. A centering rubber ring 6 for centering the lock ring 5 is arranged between the outer peripheral side of the lock ring 5 and the inner peripheral side of the lock ring receiving groove 4. An insertion ring 8 is fitted to the outer periphery of the tip of the insertion port 7 as a protruding portion that can engage with the lock ring 5 from the rear side of the receiving port. The reference numeral 7a is a protrusion formed on the outer periphery of the tip of the insertion slot 7, and has an inclined surface in a tapered shape.

At the time of joining the receiving opening 1 and the insertion opening 7, first, the sealing material 3 is housed in the sealing material housing groove 2 of the housing 1, and the centering ring 6 is mounted in the lock ring housing groove 4. The lock ring 5 is arranged on the inner circumference thereof. By inserting the insertion opening 7 into the receiving opening 1 in this state, the sealing material 3 is first compressed on the outer periphery of the insertion opening 7 to secure the seal between the receiving opening 1 and the insertion opening 7. It Further, when the lock ring 5 is held by the centering ring 6 without being eccentric, and the insertion opening 7 is pushed into the inner peripheral side of the lock ring 5 in this state, the protrusion 7a of the insertion opening 7 is inclined. When the lock ring 5 is elastically expanded by the surface and the insertion opening 7 is further pushed, the insertion opening ring 8 passes through the lock ring 5, and thereafter, the lock ring 5 returns to the original state and is securely It fits on the outer periphery of the insertion slot 7. For this reason, even if the insertion opening 7 tries to move away from the receiving opening 1, the insertion opening ring 8 abuts on and engages with the inner side surface of the lock ring 5, thereby exerting a reliable removal preventing function.

By the way, when such a separation prevention pipe joint is arranged in a curved piping place, when the separation prevention pipe joint is applied to a deformed pipe such as a bent pipe, the pipes at both ends of the deformed pipe are Since the axial directions are different from each other, when the insertion opening 7 and the receiving opening 1 are expanded and contracted along one pipe axial direction, the other end side of the deformed pipe moves in a direction different from the axial center direction of the other end side. As a result, it may not be possible to maintain a good bonding relationship. Therefore, it is desirable to minimize the amount of expansion and contraction at the joint of deformed pipes.

As a separation prevention pipe joint that can cope with this problem, one shown in FIG. 4 is conceivable. That is, in addition to the configuration shown in FIG. 3, a metal ring-shaped liner 11 is arranged between the inner end surface 9 of the receiving opening 1 and the tip portion 10 of the insertion opening 7 on the inner periphery of the receiving opening 1. . According to this configuration, when the insertion opening 7 is further moved toward the rear end surface side of the receiving opening 1 from the position where the insertion opening ring 8 abuts and engages with the rear side surface of the lock ring 5, the tip of the insertion opening 7 is moved. Since the portion 10 comes into contact with the side surface of the liner 11 on the side of the receiving opening to restrict the movement of the insertion opening 7, the expansion and contraction dimension is reduced by the width dimension of the liner 11 along the pipe axis direction, and the insertion opening 1 and the insertion opening 1 are inserted. The expansion and contraction dimension with the mouth 7 can be minimized. Further, the liner 11 is arranged in a recess formed by the inner surface of the receiving opening 1, the rear end surface 9 of the receiving opening 1, and the tip portion 10 of the insertion opening 7, and the flow path of water flowing inside is flattened. Therefore, it is possible to prevent an increase in the flow path resistance of water caused by the unevenness.

[0007]

[Problems to be solved by the device]

 However, in the separation prevention pipe joint shown in FIG. 4, the liner 11 is vertically displaced inside the receiving port 1 and slightly protrudes from the water flow path (shown by an imaginary line in FIG. 4), or is depressed. However, in this case, the flow path resistance of water may increase due to the protrusion and the recess of the liner 11.

The present invention solves the above-mentioned problems, and it is possible to increase the flow path resistance of water while minimizing the expansion and contraction of the joined receiving port and insertion port in the tube axial direction. It is intended to provide a non-separation prevention pipe joint.

[0009]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention installs a lock ring in a lock ring receiving groove formed on the inner circumference of a receiving port, and installs the lock ring on the outer periphery of the tip of the insertion port inserted into the receiving port. A protrusion is provided to prevent the detachment of the insertion slot from the receiving opening, and the protruding portion engages with the lock ring between the rear end surface of the receiving opening and the tip of the insertion opening on the inner periphery of the receiving opening. A ring-shaped liner is provided to restrict the movement of the insertion slot by contacting the tip of the insertion slot when the insertion slot moves further toward the receiving end far side relative to the combined position. A ring-shaped elastic member for centering the liner is provided between the peripheral side and the outer peripheral side of the liner.

[0010]

[Action]

 With the above configuration, since the liner is centered by the ring-shaped elastic member, the liner is prevented from protruding into the flow channel, and the flow channel resistance of water is prevented from increasing.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. The same functions as those of the conventional one are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 1, a ring-shaped metal liner 11 is arranged between the rear end surface 9 of the receiving opening 1 and the tip portion 10 of the insertion opening 7 on the inner periphery of the receiving opening 1. There is. Further, a rubber member 12 for centering the liner 11 is arranged between the inner peripheral side of the receiving port 1 and the outer peripheral side of the liner 11. The rubber member 12 is formed in a ring shape as shown in FIGS. 2 (a) and 2 (b).

At the time of joining the receiving opening 1 and the insertion opening 7, first, the rubber member 12 is attached to the inner periphery of the receiving opening 1 at a position near the rear end surface 9. Then, the liner 11 is housed inside the rubber member 12 such that the inner side surface of the liner 11 contacts the inner end surface 9 of the receptacle 1. Further, the seal material 3 is housed in the seal material housing groove 2 of the receiving port 1, the centering ring 7 is mounted in the lock ring housing groove 4, and the lock ring 5 is arranged on the inner periphery thereof. In this state, by inserting the insertion opening 7 into the receiving opening 1 until the insertion opening ring 8 passes through the lock ring 5, the lock ring 5 fits on the outer periphery of the insertion opening 7, and the insertion opening 7 receives. Even if it tries to move in a direction away from the mouth 1, the insertion opening ring 8 abuts on the back side surface of the lock ring 5 and engages with each other, so that a reliable removal preventing function is exhibited.

In this case, since the tip end portion 10 of the insertion opening 7 comes into contact with the side surface of the liner 11 on the receiving opening side with a slight expansion / contraction distance, relative movement between the receiving opening 1 and the insertion opening 7 is restricted, The expansion and contraction dimension of the receiving opening 1 and the insertion opening 7 can be minimized. Further, since the liner 11 is properly centered by the rubber member 12 and held without being eccentric, the liner 11 is prevented from vertically shifting and protruding into the flow passage, and the flow passage resistance of water is increased. There is nothing to do.

In the above embodiment, the case where the insertion ring 8 is provided at the tip portion 10 of the insertion opening 7 has been described, but the insertion opening ring 8 is not provided as a separate body, but the insertion opening ring 8 is provided. It goes without saying that the same operational effect can be obtained even when the distal end portion 10 of the insertion opening 7 is integrally formed in a shape similar to the shape provided with. Further, the liner 11 is not limited to being made of metal, and may be any member that has rigidity, and may be one that is divided in the circumferential direction.

[0016]

[Effect of device]

 As described above, according to the present invention, the protruding portion on the outer periphery of the tip end portion of the insertion slot engages with the lock ring between the inner end surface of the reception slot and the front end portion of the insertion slot. A ring-shaped liner is provided to restrict the movement of the insertion slot by contacting the tip of the insertion slot when the insertion slot moves further toward the receiving end far side relative to the position. By providing a ring-shaped elastic member for centering the liner between the liner and the outer peripheral side of the liner, the expansion and contraction distance between the receiving port and the insertion port can be minimized while Protrusions are prevented and water resistance is minimized. As a result, a good joint relationship can be maintained even if the separation prevention pipe joint is installed in a curved piping place.

[Brief description of drawings]

FIG. 1 is a sectional view of a separation prevention pipe joint according to an embodiment of the present invention.

2 (a) and 2 (b) are a front view and a side view of a rubber member of the separation preventing pipe joint.

FIG. 3 is a cross-sectional view of a conventional separation prevention pipe joint.

FIG. 4 is a cross-sectional view of a conventional separation prevention pipe joint.

[Explanation of symbols]

 1 Receptacle 4 Lock Ring Receiving Groove 5 Lock Ring 7 Insertion Port 8 Insertion Ring 9 Back End Face 10 Tip Part 11 Liner 12 Rubber Member (Elastic Member)

Claims (1)

[Scope of utility model registration request] 1. A lock ring is installed in a lock ring accommodating groove formed on the inner circumference of the receiving opening, and the lock ring is engaged with the outer periphery of the tip end portion of the inserting opening to be inserted into the receiving opening. A protrusion is provided to prevent the protrusion from coming off from the receiving port, and the protrusion is inserted between the rear end surface of the receiving port and the tip of the insertion port on the inner circumference of the receiving port rather than the position where the protruding portion engages with the lock ring. A ring-shaped liner is provided to restrict the movement of the insertion opening by contacting the tip of the insertion opening when the opening further moves toward the receiving end rear surface side. A separation prevention pipe joint, characterized in that a ring-shaped elastic member for centering the liner is provided between the outer periphery side and the outer peripheral side.