JPH0640565U - Mechanical fitting - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the sealing performance of pipe joints and visually confirm the completion of nut tightening. [Structure] A lock ring (4) of a mechanical joint according to the present invention abuts an outer inclined surface (1b) formed on an inner surface of an end of a joint body (1) and an inner surface (5b) of a nut (5), It has an opening (4a) having an inner diameter larger than the outer diameter of the tube (6) to be inserted. Since the lock ring (4) has an opening (4a) having an inner diameter larger than the outer diameter of the inserted tube (6), the lock ring (4) has an outer inclined surface (1b) formed on the inner surface of the end of the joint body (1). The washer (3) is pressed while the diameter of the packing (2) is reduced, and the packing (2) is compressed. Further, the end (5c) of the nut (5) is in contact with the stopper (8), whereby the completion of tightening of the nut (5) can be visually confirmed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pipe joint, particularly a mechanical joint exhibiting sufficient sealing performance, and a mechanical joint capable of visually confirming the tightening amount of the nut.

[0002]

[Prior art]

 As shown in FIG. 3, a conventional mechanical pipe joint has a joint body (1) having threads formed on the outer circumference of the end, a packing (2) arranged inside the joint body, and a pipe (6). Insert the washer (3) that is inserted and contacts the end of the packing, the lock ring (4) that contacts the end of the washer (3) and the opening (5a) of the nut (5), and the lock ring (6). ) Which presses against (). By tightening the nut (5), the inclined surface of the opening (5a) of the nut (5) presses the lock ring. The lock ring (4) sticks to the pipe (6) and compresses the wedge-shaped packing (2) through the washer (3) to seal it.

[0003]

[Problems to be solved by the device]

 When connecting a pair of fixed pipes (6, 6 ') with a conventional mechanical pipe joint, the tightening force of the nut (5) acts only on the lock ring sticking to the pipe, and the packing (2) A phenomenon occurred in which the lock ring (4) adhered to the pipes (6, 6 ') before being sufficiently compressed into. If the lock ring (4) sticks to the pipes (6, 6 ') while tightening the nut (5), the packing (2) will not be compressed sufficiently by the lock ring (4), and therefore the fluid will not flow after installation. There was a leaking flaw. Further, the conventional mechanical pipe fitting has a drawback that the tightening amount of the nut (5) cannot be confirmed. When the operator tightens the nut (5), he hits the lock ring (4) with a hammer and tightens the nut (5) to a predetermined position. As described above, in the conventional mechanical pipe joint, careful work is required to tighten the nut (5) to a predetermined position.

Therefore, an object of the present invention is to provide a mechanical joint that can sufficiently exhibit sealing performance and can visually check the tightening amount of a nut.

[0005]

[Means for Solving the Problems]

 The mechanical joint according to the present invention includes a joint body having a thread formed on the outer periphery of the end, a packing arranged inside the joint body, a washer through which the pipe is inserted and abutting the end of the packing, and an end of the washer. A lock ring that abuts the section, and a nut that has an opening in which the pipe is arranged and that is fitted into a screw of the joint body and compresses the packing. The joint body has an inner inclined surface and an outer inclined surface that are provided in two steps on the inner surface of the end portion. The packing contacts the inner slope of the fitting body, the washer and the pipe. The lock ring is in contact with the outer inclined surface of the joint body and the inner surface of the nut, and has an opening having an inner diameter larger than the outer diameter of the pipe to be inserted. The joint body has a stopper provided at the end of the thread.

[0006]

[Action]

 By tightening the nut, the nut end surface presses the lock ring against the joint body. The lock ring smoothly moves while reducing its diameter along the outer inclined surface and compresses the packing through the washer. As a result, the lock ring is prevented from sticking to the pipe, the nut can be tightened smoothly, and sufficient sealing performance is maintained after the packing has been sufficiently compressed. Further, when the end of the nut is tightened to the position where it comes into contact with the stopper, the lock ring is fixed to the pipe to prevent the pipe from coming out. At the same time, the end of the nut abuts on the stopper, so that the nut tightening can be visually confirmed.

[0007]

【Example】

 An embodiment of the mechanical joint according to the present invention will be described below with reference to FIGS. 1 and 2, the same parts as those shown in FIG. 3 are designated by the same reference numerals and the description thereof will be omitted.

As is apparent from FIG. 1, the joint body (1) of the mechanical joint according to the present invention has an inner inclined surface (1a), an outer inclined surface (1b), an inner inclined surface (1a) and an outer inclined surface (1b). ) And a stepped portion (1c) is formed. In the illustrated embodiment, the inner inclined surface (1a) and the outer inclined surface (1b) have different inclination angles, but they may be formed at the same angle. The rubber packing (2) is in contact with the inner inclined surface (1 a) of the joint body (1), the washer (3) and the pipe (6). The lock ring (4) comes into contact with the outer inclined surface (1b) formed on the inner surface of the end of the joint body (1) and the inner surface (5b) of the nut (5), and the lock ring (4) is connected to the pipe (6). ) It has an opening (4a) having an inner diameter larger than the outer diameter of the pipe (6) inserted so that the pipe (6) slides smoothly. The joint body (1) has a stopper (8) provided at the threaded end. A bail (7a) is provided between the end of the screw and the stopper (8).

In the above structure, the inner surface (5b) of the nut (5) presses the end portion (4b) of the lock ring (4) by tightening the nut (5) during rotation. Since the lock ring (4) has an opening (4a) with an inner diameter larger than the outer diameter of the inserted pipe (6), the lock ring (4) slides smoothly on the pipe (6) and the joint body (1) ) The diameter is reduced along the outer inclined surface (1b). The lock ring (4) presses the washer (3) and compresses the packing (2). By sufficiently tightening the nut (5), the packing (2) is pressed against the outer surface of the pipe (6), and sufficient sealing performance is exhibited. Further, the lock ring (4) having a reduced diameter is fixed to the pipe (6) at a predetermined position on the outer inclined surface (1b) to prevent the pipe (6) from coming out. The washer (3) contacts the step (1c) of the joint body (1) to prevent the packing (2) from being damaged. Further, as shown in FIG. 2, since the end (5c) of the nut (5) contacts the stopper (8), it is possible to visually confirm completion of tightening of the nut (5).

[0010]

[Effect of device]

 As described above, the present invention has an advantage that the lock ring is fixed to the pipe even after the packing is sufficiently compressed with respect to the fixed pipe, and the completion of tightening the nut can be visually confirmed. Therefore, the mechanical joint can be easily and securely attached to the pipe, and sufficient sealing performance of the mechanical joint by the packing can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of a mechanical joint according to the present invention in a hand-tightened state.

FIG. 2 is a sectional view of the mechanical joint according to the present invention in a state where final tightening is completed.

FIG. 3 is a sectional view of a conventional mechanical pipe joint.

[Explanation of symbols]

1 ・ ・ Coupling body 1a ・ ・ Inner sloped surface, 1b ・ ・ Outer sloped surface, 2 ・ ・ Packing, 3 ・ ・ Washer, 4 ・ ・ Lock ring, 4a ・ ・ Opening part ・ 5 ・ ・ Nut, 5b ・ ・Inside,
6, 6 '... Pipe, 7 ... screw, 7a ... burr, 8 ... stopper

Claims (1)

[Scope of utility model registration request] 1. A joint main body having a thread formed on the outer periphery of the end, a packing arranged inside the joint main body, a washer through which a pipe is inserted and abutting the end of the packing, and an end of the washer. In a mechanical joint having a lock ring that abuts and a nut that has an opening in which a pipe is arranged and that is fitted into a screw of a joint body and compresses packing, the joint body has two steps on the inner surface of the end portion. It has an inner inclined surface and an outer inclined surface provided, the packing contacts the inner inclined surface of the joint body, the washer and the pipe, and the lock ring can contact the outer inclined surface of the joint body and the inner surface of the nut. A mechanical joint having an opening with an inner diameter larger than the outer diameter of the pipe to be formed, and a joint body having a stopper provided at a threading end portion and capable of contacting a tightened nut.