JPH0718094U - Pipe fitting - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention relates to the structure of a pipe joint using a connection nut. [Structure] A small-diameter portion 2 and a medium-diameter portion 3 are continuously provided via a step portion 4, and a flange portion 5 having a diameter larger than the middle-diameter portion 3 is further provided at an end of the medium-diameter portion 3 with an engaging step portion 6. The joint body 1 formed via the connecting nut 12, the inner diameter of which is larger than the outer diameter of the collar portion 5 of the joint body 1, and the mounting groove 14 formed in the inner periphery of the base end portion; The retaining ring that is non-detachably fitted and retained in the mounting groove 14 and has an inner diameter smaller than that of the collar portion 5 and is capable of engaging with the engaging step portion 6 when at least fitted into the mounting groove 14. In the pipe joint consisting of 15 and the connecting nut 12, the gap R between the tip surface of the joint body 1 and the step portion 4
It was set to be longer than the distance S between the front end surface and the retaining ring 15.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to the structure of a pipe joint using a connection nut.

[0002]

[Prior art]

 FIGS. 4 and 5 show a conventional pipe joint in a longitudinal section of a main part. In the figure, a indicates a tubular joint body, b indicates a connecting nut, and c indicates a pipe joined to the joint body a by a connecting nut b. A thread groove d is formed on the outer periphery of the other end of the joint body a, and a tightening nut e screwed into the thread groove d is tightened so that a small diameter copper pipe f can be connected thereto. There is.

The joint body a has a large-diameter portion g whose outer periphery is formed in the same hexagonal shape as the tightening nut e and a small-diameter portion h. The small-diameter portion h is provided with a step portion i at the tip thereof. A middle diameter portion j is continuously provided, and a flange portion k having a diameter larger than that of the middle diameter portion j is formed at the tip of the middle diameter portion j via an engagement step portion 1. Reference numeral m denotes an annular seal material arranged between the tip surface of the joint body a and the tip surface of the pipe c.

On the other hand, the connection nut b has an inner diameter larger than the outer diameter of the flange portion k of the joint body a, and a mounting groove n is formed on the inner periphery of the base end portion thereof, and a latch ring o is fitted in the mounting groove n. Has been done. The ring o is a C-shaped elastic ring made of metal, which is externally fitted to the joint body a at the small diameter portion h and then reduced in diameter, and then inserted into the connection nut b to be elastically expanded to be fitted in the mounting groove n. Retained. Since the ring o has an inner diameter smaller than that of the flange portion k when fitted in the mounting groove n, it is shown in FIG. 4 when the connection nut b is screwed into the thread groove p of the pipe c. Thus, the pipe c can be connected to the joint main body a by engaging the engaging step portion l.

[0005]

[Problems to be solved by the device]

 By the way, in the case of the above connection, unless the joint body a is held straight against the pipe c, as shown in FIG. 5, the connection nut b is engaged with the thread groove p while the ring o is engaged with the step i. There is a risk that it will be tightened. As a result, such a joint failure may occur and the seal may be incomplete, resulting in water leakage.

[0006]

[Means for Solving the Problems]

 The pipe joint of the present invention is intended to solve the above problems, and a small-diameter portion and a medium-diameter portion are continuously provided through a step portion, and a flange having a diameter larger than the middle-diameter portion is further provided at the tip of the medium-diameter portion. Part formed through the engagement step part, a connection nut having an inner diameter larger than the outer diameter of the flange part of the joint body and a mounting groove formed on the inner circumference of the base end part, and the middle diameter part of the joint body. The retaining ring is irremovably fitted and retained in the mounting groove by the outer periphery, and has a retaining ring capable of engaging with the engaging step portion when the inner diameter is smaller than the collar portion when at least fitted in the mounting groove. In the pipe joint, the gap between the tip surface of the joint body and the step is set longer than the gap between the tip surface of the connecting nut and the retaining ring.

[0007]

[Action]

 As described above, by taking the length of the middle diameter part sufficiently, the hook ring will always be located in the middle diameter part in the situation where the connection nut can be screwed into the mating pipe, so it can be locked on the stepped part. There is no risk of the rings engaging, and defective joints are prevented.

[0008]

【Example】

 Next, an embodiment of the present invention will be described with reference to FIGS. In the figure, the joint body 1 has a small-diameter portion 2 and a medium-diameter portion 3 which are continuously provided via a step portion 4, and a flange portion 5 having a diameter larger than that of the medium-diameter portion 3 is further provided at the tip of the medium-diameter portion 3. Are formed via the engagement step portion 6. Reference numeral 7 is a tightening nut that is screwed into a screw groove 8 formed on the outer circumference of the other end of the joint body 1, and 9 is a large-diameter hexagonal outer circumference. The step portion 4 is formed in a taper shape, and the engagement step portion 6 is formed upright in an arc shape. Reference numeral 10 denotes a rubber annular seal member arranged on the tip surface 11 of the joint body 1.

On the other hand, the connection nut 12 has a thread groove 13 formed on the inner peripheral surface thereof, the thread groove 13 having a diameter larger than the outer diameter of the collar portion 5. A mounting groove 14 is formed on the inner circumference of the base end portion, and a retaining ring 15 is fitted in the mounting groove 14.

However, in the present invention, the distance R between the tip surface of the joint body 1 and the step portion 4 (including the thickness of the annular seal member 10) is the distance S between the tip surface of the connection nut 12 and the retaining ring 15. Set it to be longer. That is, when the medium diameter portion 3 is sufficiently long and the tip surface of the connecting nut 12 is projected from the tip surface of the joint body 1, the latch ring 15 is set so as to be positioned at the medium diameter portion 3 without fail. Make sure that the ring 15 does not engage with the step portion 4. FIG. 2 shows a state in which the connection nut 12 is tilted. In this state in which the tilted locking ring 15 is engaged with a part of the step portion 4 in this manner, the tip surface of the connection nut 12 is the tip of the joint body 1. Does not protrude from the surface. Therefore, as shown in FIG. 3, according to this pipe joint, the joint body 1 can always be connected straight by screwing the connection nut 12 into the thread groove 17 of the pipe 16 of the counterpart. By forming the step portion 4 in a taper shape, the transition of the latch ring 15 from the small diameter portion 2 to the medium diameter portion 3 is smoothed.

Of course, the present invention can be used not only for joining pipes as shown in this embodiment but also for joining parts of equipment such as faucets and flow meters.

[0012]

[Effect of device]

 Thus, according to the pipe joint of the present invention, it is possible to always surely join and to prevent the joining failure.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a pipe joint according to the present invention.

FIG. 2 is a vertical sectional view of a pipe joint according to the present invention.

FIG. 3 is a longitudinal sectional view of the pipe joint of the present invention when in use.

FIG. 4 is a vertical sectional view of a conventional pipe joint.

FIG. 5 is a vertical sectional view of a conventional pipe joint.

[Explanation of symbols]

 1 Joint Main Body 2 Small Diameter Part 3 Medium Diameter Part 4 Stepped Part 5 Collar Part 6 Engagement Step Part 10 Annular Sealing Material 12 Connection Nut 13 Screw Groove 14 Mounting Groove 15 Locking Ring 16 Piping R Interval S Interval

Claims (1)

[Scope of utility model registration request] 1. A joint in which a small diameter portion and a medium diameter portion are continuously provided via a step portion, and a flange portion having a diameter larger than the middle diameter portion is further formed at an end of the middle diameter portion via an engaging step portion. The main body, a connection nut having an inner diameter larger than the outer diameter of the flange portion of the joint body and having a mounting groove formed on the inner periphery of the base end, and the outer diameter of the middle diameter portion of the joint body are non-removably fitted and retained in the mounting groove. In a pipe joint comprising at least a retaining ring having an inner diameter smaller than that of the collar portion and capable of engaging with the engaging step portion when fitted in at least the mounting groove, a tip surface of the joint body and a step portion The pipe joint is characterized in that the gap is set longer than the gap between the tip surface of the connection nut and the retaining ring.