JPH0639192Y2 - Pipe fitting - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention relates to an improvement of a pipe joint in which the adapter and a tubular member are connected with a cap nut via a seal ring provided on an abutting surface of the adapter, and more particularly to a pipe joint in which the ring does not easily come off.

[Prior art]

Conventionally, a ring groove is provided at an abutting surface end of a connecting pipe portion of an adapter connected to a tubular member, and an ORS or ORFS (O-RING) is used as a pipe joint for fitting and connecting an O-ring in the ring groove.
SEAL FACE) Fitting is known. In this pipe joint, since the rubber O-ring is used as the seal ring, high airtightness can be obtained in the sealing property of the high pressure to low pressure line, and the vibration resistance can be maintained. The size is small, and the cap nut can be screwed into the mating tubular joint member in the same manner as the conventional face seal fitting regardless of the O-ring seal, and the mounting work is easy. However, since an O-ring with a small wire diameter is used due to space limitations, there is a possibility that the O-ring once fitted into the groove will fall out of the ring groove in the process of tightening the cap nut due to insufficient rigidity. There was a demand for higher assembly quality. Therefore, the following measures can be considered to prevent the O-ring from falling off. (A). Structure in which the O-ring is fixed to the ring groove with an adhesive In this structure, the use of adhesive may accelerate the deterioration of the lubricating oil and form an adhesive layer between the seal and the metal. However, there is a drawback that the sealing performance is deteriorated. (B) A structure in which a slight taper of 3 ° to 5 ° is provided on the outer wall of the ring groove. In this structure, the effect of restraining the O-ring due to the taper is not so remarkable. (C). Ring groove with dovetail groove With this configuration, the dovetail groove itself has problems in production technology,
It also leads to an increase in processing man-hours. Furthermore, there is a possibility that the tip of the groove may damage the O-ring.

[Problems to be solved by the device]

The present inventor has devised the present invention as a result of research and development in view of the above circumstances, and its main problem is to use a square ring instead of an O ring as a seal ring, and to use a tapered surface of the inner and outer peripheral walls of the ring groove. The purpose of the invention is to provide a pipe joint that restrains the square ring to prevent it from falling off.

[Means for solving problems]

In order to solve the above problems, the present invention provides (a). A cap nut to be hooked on the flange is slidably fitted on a tubular member having a flange at the tip, and a ring ring is provided in the abutting end face of the connecting pipe of the adapter to fit a square ring. , The tubular member and the adapter are abutted with each other through the square ring without leaving a gap so that the inner hole can communicate with each other, (b). Screwing the cap nut to a screw engraved on the outer periphery of the connecting pipe to connect the tubular member and the adapter (c). The ring groove is formed by inclining the inner peripheral wall surface and the outer peripheral wall surface of the ring groove in substantially the same direction in accordance with the inclination direction of the peripheral wall surface of the square ring to be fitted, (d). A technical measure is taken to fit the inclined peripheral wall surface of the square ring in the inclined direction of the peripheral wall surface of the ring groove and to restrain it in the falling direction.

[Action]

The abutting surface of the adapter on which the square ring is attached is butted against the tip of the tubular member, the cap nut is rotated to screw it into the screw of the adapter, and the end surface of the adapter can be fixed at a position where it closely adheres to the tubular member without any gap. it can. At this time, since the square ring in the ring groove is constrained by either one of the inclined inner peripheral wall surface and the outer peripheral wall surface of the ring groove, even if a force in the falling direction is applied to the square ring, the square ring is pressed down inside the ring groove. Held in. Furthermore, if the corners of the ring groove are formed as curved surfaces, there is no risk of damaging the square ring even if it abuts against the square ring.

【Example】

A preferred embodiment of a pipe joint according to the present invention will be described below with reference to the drawings. The pipe joint 1 using ORS or ORFS fittings shown in FIGS. 1 and 2 is constructed by screwing a hose stem 10 which is a tubular member to a first connecting pipe portion 4 of an adapter 2 with a cap nut 20. Are connected. That is, the hose stem 10 has a flange portion 12 at the tip. A cap nut 20 is slidably fitted onto the stem 10 for the hose, and a step portion 21 formed on the inner circumference of the cap nut 20 is fitted.
The flange portion 12 and the flange portion 12 collide with each other to restrain the movement of the cap nut 20 in the extension direction of the axis, and the tip end side can be positioned. The base end of the stem 10 is fixed to the hose via a mounting bracket 14. On the other hand, the adapter 2 in this embodiment has a wrench-hanging hexagonal portion 9 protruding outward at the center of the pipe, and a first connecting pipe in which a screw is provided on the outer circumference on the coaxial line with the hexagonal portion 9 interposed therebetween. The portion 4 and the second connecting pipe portion 5 are provided. The first connecting pipe portion 4 of the adapter 2 serves as an abutting end surface 11 that abuts the tip surface of the hose stem 10 without a gap. The abutting end surface 11 of the first connecting pipe portion 4 is formed with an annular ring groove 6 whose abutting side is open, and a square ring 7 can be fitted therein. Here, as is more clearly shown in FIG. 3, the ring groove 6 is inclined so that the inner peripheral wall surface 6a is at an angle α and the outer peripheral wall surface 6b is at an angle β so as to be gradually inward toward the abutting end surface 11. ing. Since the inclination angles α and β are the same or close to each other,
Machining in one pass is possible. The square ring 7 has a front surface and a back surface, but the inclination angles α and β are set so that the inner peripheral wall surface 7a and the outer peripheral wall surface 7b which are inclined in parallel are not mistakenly installed in the ring groove 6 in opposite directions.
It is preferable to set large and. Further, since the depth d and the groove width A of the ring groove are set larger than the conventional groove depth (1.3 mm) and groove width (2.4 mm), it is possible to deal with a highly rigid square ring. Therefore, when the square ring 7 is fitted into the ring groove 6 having the above-described structure, the peripheral wall surface (the outer peripheral wall surface 7b in this embodiment) of the square ring is the peripheral wall surface of the ring groove 6 even if a force in the falling direction is applied to the square ring 7. It is restrained by the outer peripheral wall surface 6b in this embodiment, and the fall off of the square ring 7 is prevented. In addition, the bottom wall surface 6c, the outer peripheral wall surface 6b, and the inner peripheral wall surface of the ring groove 6
The corners where 6a and 6a intersect each other have predetermined curvatures R1 and R2.
Since the abutting end surface 11 and the outer peripheral wall surface 6b and the inner peripheral wall surface 6a are also formed into a curved surface with predetermined curvatures r1 and r2,
There is no possibility of damaging the square ring 7 even if it collides with the square ring 7. Next, as shown in FIGS. 1 and 2, a male screw 13 is engraved on the outer periphery of the abutting end surface 11 of the first connecting pipe portion 4,
The cap nut 20 can be screwed onto a female screw portion 22 formed on the inner circumference of the cap nut 20. Therefore, the abutting end surface 11 of the first connecting pipe portion 4 is butted against the tip of the hose stem 10, and the cap nut 20 whose base end is restrained by the flange portion 12 is rotated to rotate the male screw 13 of the first connecting pipe portion 4. The first connecting pipe portion can be connected and fixed to the hose stem 10 at a position where the first connecting pipe portion and the hose stem 10 are in close contact with each other without a gap. Then, the inner holes 8 of the stem 10 and the adapter 2,
It is possible to form a pipe joint that connects 8 '. The structure of the pipe joint provided with the ring groove 6 and the square ring 7 has various design changes based on the connection structure of FIG. 1 and an example thereof will be shown below. In the pipe joint 1A shown in FIG. 4, the adapter 2A has one connecting pipe portion 4A similar to the first connecting pipe portion of the above embodiment, and the other connecting pipe portion 5A is provided with a tapered pipe screw S. It consists of examples. In addition, the same components as those in the first embodiment are designated by the same reference numerals. The same applies to the following examples. In the case of the pipe joint 1B shown in FIG. 5, the tubular member 10B is composed of a tube 16 having a sleeve 15 integrally fixed to the tip thereof, and the adapter 2B is provided with a pair of connecting pipe portions 4B and 5B opposed to each other. 9 shows a different example consisting of a T-shaped chi with. In this case, the pair of connecting pipe portions 4B opposed to each other on the Qi are female threads of the cap nut 20 on the outer circumference, like the first connecting pipe portion of the above-mentioned embodiment.
A male screw 13 that engages with 22 is engraved, and its abutting end surface
A ring groove 6 into which the square ring 7 is fitted is formed at 11. Further, a general mating joint such as a swivel is used for the connecting portion 5B. Therefore, the cap nut 20 is attached to the flange formed on the sleeve 15.
By restraining with 12 and restraining the movement in the extension direction of the axis, the distal end face of the sleeve 15 is brought into close contact with the abutting face 11 of the connecting pipe portion 4B of the Qie, and the cap nut 20 can be rotated and screwed. The cap nut 20 may be formed with an inspection window 23 opening penetrating the inside and outside, and the square ring 7 protruding from the tip of the hose stem 10 can be seen from the outside through the inspection window 23. In the pipe joint 1C shown in FIG. 6, the adapter 2 has one connecting pipe portion 4C having the same structure as the first connecting pipe portion, and the other connecting pipe portion 5C is a base end of a screw portion formed on the outer periphery thereof. O-ring 17
Have different shapes that are fitted together. In the above embodiment, the direction of inclination of the peripheral wall surface of the ring groove corresponds to the direction of inclination of the peripheral wall surface of the square ring. Contrary to the present embodiment, it gradually inclines outward toward the abutting end surface. But it's okay.

[Effect of device]

According to this invention, since the inner and outer peripheral wall surfaces of the ring groove are inclined in the same direction, even if a force is applied to the fitted angular ring in the falling direction, the angular wall is constrained by the inclined peripheral wall surface of the ring groove. The square ring can be securely held in the ring groove without using an adhesive or the like, and can be detached without using any special tool. Moreover, since the width of the opening of the ring groove does not become narrow unlike the dovetail groove, the square ring is not damaged. Furthermore, since the peripheral wall of the ring groove is inclined in the same direction, molding becomes easy. In addition, although the square ring can have a large cross-sectional area and rigidity can be improved, it is not necessary to set the screw size of the connecting pipe part and the oil passage of the inner hole larger than the conventional size. Similar sizes can be maintained.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of an essential part of a pipe joint of the first embodiment, FIG. 2 is a longitudinal sectional view of an essential part when a hose stem is connected to an adapter, and FIG. 3 is an enlarged cross section of a ring groove and a square nut. 4 and 5 are views showing a pipe joint of another embodiment in which the second screw of the adapter of FIG. 1 is a taper screw, and FIG. 5 uses a tube having a sleeve welded instead of the stem of FIG. FIG. 6 is a view showing a pipe joint of another embodiment in which a Qi is used in place of the adapter, and FIG. 6 is a sectional view of a main part of still another embodiment in which a tube having a sleeve welded is used in place of the stem in FIG. is there. 1 …… Pipe joint 2 …… Adapter 4 …… First connecting pipe part 5 …… Second connecting pipe part 6 …… Ring groove 6a …… Inner peripheral wall surface 6b …… Outer wall surface 6c …… Bottom wall surface 7 …… Corner Ring 7a …… Inner wall surface 7b …… Outer wall surface 11 …… Abutting end surface 14 …… Hose mounting part

Claims (2)

[Scope of utility model registration request] 1. A tubular nut having a flange portion at its tip is slidably fitted with a cap nut to be hooked on the flange, and an annular ring groove is provided on an abutting end surface of a connecting pipe portion of an adapter. A square ring is fitted, the tubular member and the adapter are abutted through the square ring without a gap to allow communication of the inner hole, and the cap nut is attached to the screw engraved on the outer circumference of the connecting pipe portion. A pipe joint for connecting a tubular member and an adapter by screwing, wherein the ring groove is aligned with the inclination direction of the peripheral wall surface of the square ring to be fitted, and the inner peripheral wall surface and the outer peripheral wall surface of the ring groove are in the same direction. A pipe joint which is inclined substantially in parallel, and in which the peripheral wall surface of the square ring that is inclined is fitted in and constrained in the falling direction in accordance with the inclination direction of the peripheral wall surface of the ring groove. 2. The pipe joint according to claim 1, wherein the corner portion of the ring groove is formed into a curved surface.