JP2507100Y2 - 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 an adapter and a tubular member are connected by a cap nut via an O-ring provided on an abutting surface of the adapter, and particularly, an inspection window capable of inspecting an attached state of the O-ring. The present invention relates to a pipe joint.

[Prior art]

Conventionally, ORS has been used as a pipe joint for connecting by connecting an O-ring at the end of the abutting surface of the connecting pipe portion of the adapter connected to the tubular member.
ORFS (O-RING SEAL FACE) fitting is known. Since this pipe joint uses a rubber O-ring,
High airtightness can be obtained in the sealing property in the high-pressure to low-pressure line, and 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 the O-ring is covered with the cap nut,
In the unlikely event that the O-ring is not installed or comes off, it cannot be known from the outside. In addition, if the O-ring falls off or is twisted during the process of rotating and screwing the cap nut, it cannot be inspected. Therefore, if the O-ring is tightened while protruding from the O-ring groove, the O-ring may be damaged or oil leakage may occur. On the other hand, the O-ring may be fixed to the O-ring groove by baking or the like, but there is a drawback that the O-ring is difficult to mount or replace. Further, Japanese Utility Model Publication No. 1-28398 discloses a structure in which the mounting state of a gasket held by a retainer can be inspected through a peep nut viewing window. However, with the above configuration, although the gasket held by the retainer can be inspected, it is necessary to take sufficient measures when the O-ring fits into the groove that is formed in the midway position of the abutting end surface of the connecting pipe and opens. There was a drawback that I could not.

[Problems to be solved by the device]

The present invention has been made in view of the above circumstances, and its main problem is to fix the state of the O-ring fitted in the opening groove formed at the middle position of the abutting end surface of the connecting pipe portion to the cap nut. An object of the present invention is to provide a pipe joint that can be inspected from the outside by opening an inspection window at a predetermined position.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention has a tubular member having a flange portion at its tip, slidably fitted with a cap nut hooked on the flange, and attached to the abutting end surface of the connecting pipe portion of the adapter. An O-ring groove is provided in an annular shape, and the O-ring is fitted thereinto, and the annular member and the adapter are abutted with each other through the O-ring without a gap to allow the inner hole to communicate with each other. In the pipe joint for connecting the tubular member and the adapter by screwing the cap nut to the screw, an O-ring groove is formed by a concave groove formed in a circular shape at an intermediate position of the abutting end surface of the connecting pipe portion and opening. An O-ring that is set to be longer than the groove height of the O-ring groove and has a thickness and a part of which protrudes to the outside is fitted, and the O-ring groove is fitted on the outer peripheral surface of the cap nut on the outer peripheral extension of the end surface of the tubular member. And open corresponding to the protruding width of the O-ring. Formed by Toru設 the Kenmado, have taken the technical means that.

[Operation] The abutting surface of the adapter on which the O-ring is mounted is butted against the tip of the tubular member, and the cap nut is rotated and screwed into the screw of the adapter, and the end surface of the adapter is fixed at a position where it closely adheres to the tubular member without a gap. can do. At this time, since the inspection window is opened in the cap nut, a part of the O-ring protruding from the midway position of the abutting surface of the adapter can be seen from the inspection window, and whether the O-ring is attached or not can be seen. This can be confirmed, and the abutment surface of the adapter abuts the tip end surface of the tubular member without a gap by the tightening rotation of the cap nut, so that it is possible to check the presence or absence of the protruding state of the O-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 fitting shown in FIGS. 1 and 2 is the first connecting pipe portion 4 of the adapter 2.
A hose stem 10 serving as a tubular member is screwed with a cap nut 20 to connect the two. That is, the stem 10 for the hose uses the flange portion 12 at the tip. A cap nut 20 is slidably fitted on the stem 10 for the hose, and a step portion formed on the inner circumference of the cap nut 20.
21 and the flange portion 12 abut against each other so that the cap nut 20 can be restrained from moving in the extension direction of the axis, and can be positioned on the tip end side. 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. An annular O-ring groove 6 is formed at a midway position of the abutting end surface 11 of the first connecting pipe portion 4, and an O-ring 7 having a thickness longer than the groove height of the O-ring groove 6 is formed. Can be fitted. As a result, the O-ring 7 fitted in the O-ring groove 6 is inserted.
Part of its tip protrudes outward. A male screw 13 is provided on the outer circumference of the abutting end surface 11 of the first connecting pipe portion 4.
Are engraved, and can be screwed onto the 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 '. Here, in this invention, as shown in FIG. 3, an inspection window 23 is formed on the outer peripheral surface of the cap nut 20. In the case of the illustrated example, the inspection window 23 is transparently provided on one flat surface of the outer peripheral surface of the cap nut 20 formed of a hexagonal cylinder, and the opening position thereof is set on the outer peripheral extension of the tip end surface of the hose stem 10. In addition, the diameter is set so as to correspond to the protruding length L of the O-ring 7 and longer than that, so that the protruding portion can be seen entirely in the axial direction. Therefore, in the state before connection, as shown in Fig. 3, the inspection window
The O-ring 7 protruding from the tip of the hose stem 10 can be seen from the outside through 23. Two inspection windows 23 are provided at 180 ° intervals in the circumferential direction of the cap nut 20, but the number of the inspection windows 23 is not particularly limited, and one inspection window 23 or the one shown in FIG. As shown in FIG. Next, in the pipe joint 1A shown in FIG. 5, 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 different embodiments. 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. Next, in the case of the pipe joint 1B shown in FIG. 6, a tubular member 10B
Is a tube 16 having a sleeve 15 integrally fixed to the tip thereof, and the adapter 2B is a T-shaped Qi having a pair of connecting pipe portions 4B and 5B branching opposite to each other. In this case, the pair of connecting pipe portions 4B facing each other on the Qi are engraved on the outer periphery thereof with male screws 13 which are screwed into the female screw 22 of the cap nut 20, similarly to the first connecting pipe portion of the above-mentioned embodiment. Further, an O-ring groove 6 into which the O-ring 7 is fitted is formed on the abutting end face 11. Further, a general mating joint such as a swivel is used for the connecting portion 5B. Therefore, the cap nut 20 is restrained by the flange 12 formed on the sleeve 15 to restrain the movement in the extension direction of the axis, and the tip end surface of the sleeve 15 is brought into close contact with the abutting surface 11 of the connecting pipe portion 4B of the Qi. The cap nut 20 can be turned and screwed. In the pipe joint 1C shown in FIG. 7, 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 formed on the outer periphery thereof and is formed at the base end of the screw portion. Ring 17
Have different shapes that are fitted together. In each of these embodiments, the mounting state of the O-ring 7 can be monitored from the inspection window 23 when the cap nut 20 rotates, as in the first illustrated embodiment. In the case of the above-mentioned embodiment, the adapter has a pair of connecting pipe parts, and each tubular member is illustrated as a separate structure.
In this invention, the adapter may have one of the connecting pipe portions integrally fixed to the tubular member.

[Effect of device]

According to this invention, since the inspection window is provided on the cap nut,
You can inspect from the outside if you forget to install the O-ring.
Also, the operator can confirm whether the O-ring does not drop from the O-ring groove even when the cap nut is being threaded. In particular, even when the O-ring is damaged by tightening the cap nut with the O-ring protruding from the ring groove, the O-ring can be inspected from the outside so that re-work can be performed before passing the hydraulic oil. Useless work can be prevented in advance. In this way, the worker can perform the work while visually checking the assembled state of the O-ring, so that the work can be reliably performed and the reliability of the product can be improved.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of the main part of the pipe joint of the first embodiment, FIG. 2 is a vertical cross-sectional view of the main part when a stem for a hose is connected to an adapter, and FIG. 3 is a state before tightening a cap nut. The figure which shows the positional relationship of a certain adapter, the stem, and the inspection window, FIG. 4 is a top view which shows a different Example when many inspection windows are provided,
FIG. 5 is a diagram showing a pipe joint of another embodiment in which the second screw of the adapter of FIG. 1 is a taper screw, and FIG. 6 uses a tube with a sleeve welded in place of the stem of FIG. FIG. 7 is a view showing a pipe joint of another embodiment in which Qi is used in place of FIG. 7, and FIG. 7 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 of FIG.

[Explanation of symbols]

 1 …… Pipe joint 2 …… Adapter 4 …… First connection pipe part 5 …… Second connection pipe part 7 …… O ring 10 …… Stem 11 …… Abutting end face 14 …… Hose mounting part 15 …… Sleeve 20 …… Cap nut 23 …… Inspection window

Claims (2)

(57) [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 O-ring groove is annularly provided on the abutting end face of the connecting pipe portion of the adapter. The O-ring is fitted, and the tubular member and the adapter are abutted with each other through the O-ring without a gap to allow the inner hole to communicate with each other, and the cap nut is attached to the screw engraved on the outer periphery of the connecting pipe portion. In a pipe joint that is screwed to connect a tubular member and an adapter, an O-ring groove is a circular groove formed in a circular shape at an intermediate position of an abutting end surface of the connecting pipe portion and has a groove height of the O-ring groove. Is set to a thickness longer than the length of the
A ring is fitted, and an inspection window is provided on the outer peripheral surface of the cap nut, which is on the outer peripheral extension of the end surface of the tubular member and opens corresponding to the protruding width of the O-ring. And pipe fittings. 2. The pipe joint according to claim 1, wherein the cap nut is a hexagonal nut, and a plurality of inspection windows are provided at equal intervals on a flat surface of a peripheral wall thereof.