JPH0618115Y2 - Pipe fitting - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a pipe joint, in particular, a nylon hose,
The present invention relates to a pipe joint suitable for connecting flexible pipes.

[Conventional technology]

Generally, as a pipe body used for pressure piping with a small diameter, pressure resistance,
From the viewpoint of excellent flexibility, nylon hoses are often used, and as an example of a joint for connecting hoses of this type, there is a conventional structure shown in FIG.

To explain this in detail, in FIG. 2, 1 indicates a joint,
Reference numeral 2 denotes a nylon hose as a tubular body connected to the joint 1. The joint 1 has a metal joint body 3, a metal socket 4, and a rubber protective sleeve 5. Among them, the joint body 3 has a joint mounting end 3A having an outer circumference threaded, a joint body 3B having a nut formed on the outer circumference, and a hose 2 to which the outer circumference of the nut-side base is threaded. The nipple portion 3C is integrally formed as shown. The nipple portion 3C has a structure in which the thread cutting position and the hose connecting position are separated by a step, and the socket 4 is located at the thread cutting position.
Are screwed together.

Therefore, at the time of connection, after inserting the hose 2 into the annular space formed by the nipple portion 3C and the socket 4 as shown, the socket 4 is caulked, and then the protective sleeve 5
Is fitted over the socket 4 and part of the hose 2 as shown. The protective sleeve 5 prevents the hose 2 from being bent near the boundary between the connecting portion and the hose 2 due to bending.

[Problems to be solved by the device]

However, in such a conventional pipe joint, since the protective sleeve 5 is set tightly in terms of its function, the external fitting work is difficult and time-consuming.
Since the socket 4 has a structure to be fitted externally, it is necessary to sufficiently lengthen the axial direction in contact with the hose 2 to reduce the bending pressure. Therefore, the entire protective sleeve 5 inevitably becomes large, There is a problem that the connecting portion is bulky and the joint space becomes large.

The present invention has been made in view of the above problems of the prior art, and it is an object of the present invention to solve the problem of facilitating mounting of a protective sleeve for preventing breakage of a tubular body and reducing the joint space. And the subject.

[Means for Solving the Problems]

In order to solve the above problems, the present invention provides a nipple portion that connects a flexible pipe body, a socket that presses and holds the pipe body connected to the nipple portion from the outer periphery, and a socket of the socket. A protective sleeve made of an elastic body, one end of which is locked to the inner surface of the end portion on the tube body insertion port side and is externally fitted to the tube body.

[Action]

In the present invention, the tubular body is inserted into the annular space between the socket and the nipple portion, in which the protective sleeve is locked at the end portion on the tubular body insertion port side, and the socket is caulked from the outer periphery to secure the tubular body to the nipple portion. Hold with and. Alternatively, insert the tube into the nipple,
After pressing and holding the pipe with the socket, attach the protective sleeve. The protective sleeve has one end press-fitted between the socket and the hose to engage the inside of the socket with the protective sleeve. In this state, the protective sleeve made of an elastic body intervenes as a cushioning material inside and outside the end portion of the socket on the tube body insertion port side. Therefore, even if the pipe body is bent, the bending pressure applied to the pipe body at the boundary of the connecting portion can be reduced, and a reliable bending prevention effect can be obtained. on the other hand,
Since the protective sleeve is not fitted over the socket,
Since the socket is not bulky and can be locked before being caulked, the mountability is significantly improved as compared with the case where the socket is externally fitted.

〔Example〕

 An embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, 11 indicates a pipe joint, and 12 indicates a nylon hose as a pipe body connected to the joint 11. The joint 11 has a joint body 13 made of metal, a socket 14 made of metal, and a protective sleeve 15 made of rubber.

Among these, the joint main body 13 includes a joint mounting end 13A, a joint main body 13B having a nut formed on the outer periphery thereof, a screw portion 13Ca formed on the outer periphery of the base portion on the nut side, and a connecting portion 13Cb for connecting the hose 2. Nipple portion 1 having
3C is integrally molded as shown. Nipple part 13
C has a structure in which the threaded portion 13Ca and the connection portion 13Cb are separated by a step H having a dimension corresponding to the wall thickness of the hose 12. Further, a predetermined number of circumferential grooves 16 for preventing the hose from coming off are formed on the outer peripheral surface of the connecting portion 13Cb.

Further, the socket 14 is formed in a cylindrical shape, and is caulked from the outer periphery when connecting the hose as shown in the drawing, so that the joint body 13
The B side is thick and the opposite side is thin cylindrical.
Then, the inner peripheral surface of the socket 14 on the joint body 13B side is threaded so as to be screwed into the threaded portion 13Ca of the nipple portion 13C, so that the hose 12 is connected to the nipple portion 13C.
, 17 which are opposed to the circumferential grooves 16, .., 16 of the nipple portion 13C are integrally formed on the inner peripheral surface of the central portion sandwiched between the connecting portion 13Cb and the connecting portion 13Cb. Has been formed. Further, as shown in the drawing, the inner peripheral surface of the end portion of the socket 14 on the hose insertion port side is formed with a tapered surface 18a having a diameter that decreases toward the central portion and a key groove 19a continuous with the tapered surface 18a.

Further, the protective sleeve 15 is formed in a cylindrical shape having an inner diameter that is fitted onto the hose 12. The protective sleeve 15 is provided on the outer peripheral surface of the tip portion thereof with the socket 14
Tapered surface 18a and key groove 19b having a shape opposite to and fitted to the tapered surface 18a and key groove 19b.
Are integrally formed.

Here, the key groove 19a and the protrusion 19b constitute a locking mechanism.

Next, the function and effect of this embodiment will be described.

First, in order to connect the joint 11 and the hose 12, the hose 12 is inserted from the side of the protective sleeve 15 while the protective sleeve 15 is locked to the socket 14 by the locking mechanism, and the hose 12 is brought into contact with the step of the nipple portion 13C. Contact. Next, the socket 14 is caulked from the outer periphery, and the hose 12 is attached to the nipple portion 1.
It is sandwiched between 3C and the socket 14. Alternatively, the hose 12
First, the protective sleeve 15 and the socket 14 are externally fitted in this order in advance. Then, the tip portion of the protective sleeve 15 on the side of the protrusion 19b is attached to the tapered surface 1 of the socket 14.
8a is pushed between the socket 14 and the hose 12, and the protective sleeve 15 is elastically deformed so that the key groove 19a and the protrusion 19b are fitted to each other.
Prevent dropout of 5.

Next, in this state, the hose 12 is fitted onto the connecting portion 13Cb of the nipple portion 13C of the joint 11. Then, the socket 14 and the protective sleeve 1 fitted integrally with the socket 14
After moving the socket 5, the socket 14 is screwed into the threaded portion 13Ca of the nipple portion 13C, and then the socket 14 is caulked from the outer periphery to complete the connection.

In this embodiment, since the hose 12 is connected as described above, the hose 12 receives the radial force from the connecting portion 13Cb due to the elastic deformation of the hose 12, and the circumferential groove 16, , 16 and the protrusions 17, ..., 17 exert a holding force in the radial direction, so that the rigidity of the hose 12 in the pulling direction is sufficiently obtained, and the dropping of the hose 12 is prevented.

In addition, the protective sleeve 15 is elastic at its boundary at the nipple portion 13C to reach the hose 12, and the hose 12 is elastic.
Reduces bending load on. At the same time, the protective sleeve 15 is interposed so that the end of the metal socket 14 does not directly contact the outer cover of the nylon hose 12. Therefore, even when the hose 12 is repeatedly bent,
It does not break at the end of the nipple portion 13C.

Further, since a part of the protective sleeve 15 is fitted into the socket 14 to obtain the same function as that of the conventional example described above, the joint 11 can be downsized. In particular, the length in the axial direction of the joint can be remarkably shortened, and the outer diameter of the connecting portion is not bulky.

Furthermore, in this embodiment, unlike the conventional case where the protective sleeve is externally fitted over the entire connecting portion after the hose is connected, a part of the protective sleeve may be engaged with the socket 14 before being caulked. Therefore, there is also an advantage that the mounting work is facilitated and the work efficiency is remarkably improved.

In the above-mentioned embodiments, the case where the tube body is made of nylon is explained, but the present invention is not necessarily limited to this. For example, the tube body is made of polyethylene or vinyl hose. Also, the joint may be a plastic joint, and the same applies to these cases.

Further, in the above-described embodiment, the protective sleeve 15 is connected to the socket 14 before connecting the hose 12 (before caulking the socket 14).
The hose 12 and the hose 12 are fitted and engaged with each other. However, the hose 12 may be fitted by press-fitting between the two after connection if necessary.

Furthermore, the engagement mechanism between the protective sleeve 15 and the socket 14 is not necessarily limited to the one having the above-described structure, and it is sufficient that the same engagement as described above can be performed on the inner peripheral surface of the socket 14. Further, the material of the protective sleeve 15 may not be rubber.

Furthermore, the connection between the socket 14 and the joint body 13B is, in addition to the connection by screwing as in the embodiment, for example, the socket 14 is provided with an inner collar and the joint body 13B is provided with a protrusion on the outer peripheral surface thereof to engage them. You may do it.

[Effect of device]

Since the present invention is constructed and functions as described above,
Since the end portion of the protective sleeve can be engaged with the end portion of the socket on the tube insertion port side and can be interposed between the inner peripheral surface of the socket and the outer peripheral surface of the socket, bending due to bending of the hose can be accurately prevented. . At the same time, the work of interposing the protective sleeve is significantly easier than that of the conventional external fitting, and the work efficiency is improved, and the protective sleeve is made small by partially interposing it inside the socket. It is possible to reduce the axial length of the pipe joint, and the outer diameter of the connecting part is not bulky, which can promote downsizing of the entire pipe joint and save space when connecting. Effect is obtained.

[Brief description of drawings]

FIG. 1 is a partial sectional view showing an embodiment of the present invention, and FIG. 2 is a partial sectional view showing a conventional example. In the figure, 11 is a pipe joint, 12 is a nylon hose as a tubular body, 13C is a nipple portion, 14 is a socket, and 15 is a protective sleeve.

Claims (1)

[Scope of utility model registration request] 1. A nipple portion for connecting a flexible pipe body, a socket for pressing and holding the pipe body connected to the nipple portion from the outer periphery, and an end of the socket on the pipe body insertion port side. And a protective sleeve made of an elastic body, one end of which is locked to the inner surface of the portion and which is fitted over the tubular body.