JPH083828Y2 - Pipe fitting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a pipe joint such as a welded branch saddle for a fire hydrant.

[Prior Art] FIG. 7 shows a branch saddle A for a fire hydrant, which is an example of a conventional pipe joint. The saddle A is welded to the pipe wall 101 of the main pipe 100, and the internal passage A ₁ of the saddle A is connected to the main pipe 100.
Is connected to the pipeline 100 '. The main pipe 100 and the pipe B are formed by screwing and fastening the taper female screw part a formed on the inner periphery of the taper male screw part b provided on the pipe end of the pipe B.
It was supposed to be connected with. S is the weld, SP
Is a sprinkler.

In such a saddle A, when connecting the pipe B to the main pipe 100, a procedure of rotating the pipe B and screwing the taper male screw part b into the taper female screw part a of the saddle A is often adopted. Further, as the pipe B, not only straight pipes, but also pipes of various shapes such as unwinding pipe for sprinkler whose middle portion is bent into an elbow shape as shown in FIG. 7 are used, and tightening of those pipes is also possible. A pipe wrench is often used as the tool.

[Problems to be solved by the invention] By the way, in the construction of piping for fire hydrants, a method is adopted in which the piping parts are unitized in advance in the factory in order to improve the workability on site, and then they are transported to the construction site and assembled. The saddle A is welded and joined at predetermined intervals, and the above-mentioned threaded straight pipe, unwound pipe, and other parts are examples of the unitized parts.

On the other hand, although piping work for a fire hydrant may be performed in a narrow space such as between a building ceiling and an indoor top plate, a pipe B bent like an unwinding pipe may be connected to the main pipe 100.
When the pipe B is rotated with a tightening tool such as a pipe wrench to screw the taper male screw part b into the taper female screw part a of the saddle A, the bent portion of the pipe B draws a circular locus with a large radius R. Will be turned. Therefore, when the work has to be performed in a narrow space, the bent portion of the pipe B may become an obstacle and the work of screwing the pipe B cannot be performed.

In that case, the pipe end of the pipe B may be forcibly and electrically welded to the saddle A to be joined. However, in such a case, not only the quality and strength of the joint may not be sufficiently ensured, but also Electric welding in a narrow space has a very bad working environment, and there is a risk of fire and a worker's risk of being burned by welding sparks. Furthermore, it is preferable for safety and hygiene such as inhaling welding fume. It is easy to cause a situation that does not exist. Further, since the prescribed tightening torque of the pipe is set to be larger as the diameter is larger, the connecting work of the large-diameter pipe in a place where the scaffolding is poor becomes a heavy labor for the worker.

As described above, the conventional saddle A has various problems in workability and work environment in relation to the work space.
The same problem exists not only in the welded branch saddle for fire hydrants but also in various tubular pipe joints joined to the pipe wall of the pipe body and having internal passages communicating with the pipe passages of the pipe body.

The present invention has been made in view of the above situation,
Corresponding to various conditions such as working space, working environment, working conditions, etc., select any one of welding type joint, screw type joint and groove type joint to always use for suitable pipe connection. It is an object of the present invention to provide a pipe joint that can be used.

[Means for Solving the Problems] In order to achieve the above object, the pipe joint according to the present invention comprises:
A tubular pipe joint, which is welded to a pipe wall of a pipe body and has an internal passage communicating with the pipe line of the pipe body, wherein an end portion of the pipe is provided near a tip opening of the tubular joint body. Is formed by welding, and a joint for welding type joint that can be welded to the pipe is formed, and an annular shape is formed on the inner periphery of the tubular joint main body at a position adjacent to this welded joint on the inner side in the axial direction. A female threaded portion for a threaded joint, which is smaller in diameter than the welded joint and has a diameter smaller than that of the welded joint, and which is capable of screwing and fastening a male threaded portion formed at the tube end of the threaded pipe, and the welded joint An annular groove is formed on the outer periphery of the tubular joint body at a location adjacent to the inner side in the axial direction, and a groove type joint packing is provided on the outer surface of the tubular joint body adjacent to the annular groove on the tip opening side. It is characterized in that a contact seat surface is formed.

[Operation] According to the present invention, when connecting a straight pipe or an unwinding pipe in which a wide working space is secured, the internal thread portion formed on the inner periphery of the tubular joint body is formed at the pipe end of the threaded pipe. It can be used as a threaded joint with very good workability by screwing the male threaded part together, and it is possible to screw it in a place where there is no concern that sparks will scatter around flammable materials or the pipe is bent. When connecting under non-working conditions, the end of the pipe is inserted into the welded joint formed in the vicinity of the tip opening of the tubular joint body, and the pipe is fillet welded to the welded joint. It is possible to use it as a welded joint that can sufficiently secure the quality and strength of the Large diameter pipe When connecting in places where it is difficult to increase the tightening torque or where the work space is narrow and it is difficult to rotate the pipe, use the annular groove formed on the outer periphery of the tubular joint body and the packing contact seat surface. Thus, it can be used as a groove-type joint in which a reliable sealing can be achieved and a secure coupling without fear of dropping is desired.

[Embodiment] FIG. 1 is a partial sectional view of a pipe joint according to an embodiment of the present invention. Reference numeral 1 denotes a pipe body, for example, a water supply main pipe of a fire hydrant pipe provided in a space between a building ceiling and an indoor top plate is selected. 2 is a branch saddle for fire hydrants as a pipe joint.
The saddle 2 has a tubular shape, and the tubular saddle body 2A
The end portion of the pipe 5 is located near the tip opening 21 of the (joint body).
(See FIG. 4) is inserted to form a joint 22 for a welding joint, which will be described later, capable of welding and joining the pipe 5, and at a position adjacent to the weld joint 22 on the inner side in the axial direction. A female thread portion 23 for a threaded joint, which will be described later, is formed on the inner circumference of the cylindrical saddle 2A, and a taper male thread portion 41 (see FIG. 3) formed at the tube end of the threaded tube 4 can be screwed and fastened, and An annular groove 24 having a predetermined width is formed on the outer periphery of the tubular saddle body 2A adjacent to the welded joint portion 22 on the axially inner side, and the tip opening 21 side adjacent to the annular groove 24 is formed. On the outer surface of the cylindrical saddle body 2A, a contact surface 25 for a groove type joint packing described later is formed. The diameter of the welded joint portion 22 is slightly larger than the maximum diameter of the tapered female screw portion 23, and an annular step portion 26 is provided between the welded joint portion 22 and the tapered female screw portion 23. A flange 27 and a protrusion 28 are provided on the other end of the saddle 2.
As is apparent from FIGS. 1 and 2, the protrusion 28 is the saddle 2
Although it is provided at a plurality of positions on the inner peripheral portion of the other end of the above, it may be annular.

The saddle 2 is joined to the pipe body 1 by welding the flange 27 to the pipe wall 11 in a state where the protrusion 28 is inserted into the circular hole 12 formed in the pipe wall 11 of the pipe body 1 and positioned. The internal passage 29 communicates with the pipe line 13 of the pipe body 1 in a branched manner. 3 is a welded part.

An example of use of the pipe joint having the above-mentioned configuration as a screw type joint is shown in FIG. That is, the taper female thread portion 23 is connected to the pipe 4
The pipe body 1 and the threaded pipe 4 are connected by screwing and fastening the taper male screw portion 41 provided at the pipe end.

The method of use as such a threaded joint is the same as that of the conventional example described in FIG. 7, and can be used for connecting straight pipes or unwinding pipes when a wide working space is secured. Is.

An example of using the above pipe joint as a welded joint is shown in FIG. That is, the pipe end 51 of the pipe 5 is inserted into the welded joint portion 22, the end face thereof is abutted against the step portion 26, and the pipe 5 is joined to the welded joint portion 22 by fillet welding. For the welding in this case, a straight welded joint portion 22 formed specially as a spot to be welded to the saddle 2 is selected, and since it is fillet welding that can easily secure a large joint strength, The quality and strength of the joint are markedly improved as compared with the case where forced welding as described at the beginning is performed, and high quality and strength are sufficiently secured.

Such a welding joint can be used in a place where there is no concern that welding sparks will scatter around flammable materials or in a place where the working space is sufficiently wide. According to this method, the pipe connected to the saddle 2 can be used. It can be connected without rotating.

An example of using the above pipe joint as a groove type joint is shown in FIG. Further, FIG. 6 shows a packing 71, which is a component of the groove type joint, and a pair of couplings 72, 72. The packing 71 is made of an annular elastic material having a U-shaped cross section, and the ridges 71a on both sides in the width direction of the packing 71,
71b is fitted on the outer surfaces of the tube walls which are butted against each other. Further, the couplings 72, 72 have a halved shape, and each has a pair of annular convex portions 74, 74, a packing accommodating groove 75 formed between the annular convex portions 74, 74, and a flange portion 76. , 76 and. In FIG. 5, the pipe 6 is concentrically butted with the saddle 2 at a constant interval, and a contact seat surface 61 formed on the outer surface of the pipe end of the pipe 6.
A pair of couplings that covers the packing 71 by straddling the contact surface 25 of the saddle 2 and the packing 71.
Each of the annular projections 74, 74 of 72, 72 is connected to the annular groove 24 and the pipe 6 on the saddle 2 side.
The annular groove 63 formed on the side of the coupling 72, 72 using the flange portions 76, 76 of the couplings 72, 72 and the bolts 81.
It is tightened using the nut and the nut 82. When the pipe body 1 and the pipe 6 are connected in this way, the bolt 81 and the nut 82
The annular projections 74, 74 of the pair of couplings 72, 72 tightened by are fitted into the annular groove 24 on the saddle 2 side and the annular groove 63 on the pipe 6 side, and the saddle 2 and the pipe 6 may fall off. Securely coupled together, and at the same time packing 7 by the couplings 72, 72
1 is compressed and the ridges 71a and 71b are the contact surfaces on the saddle 2 side.
25 and the contact surface 61 on the side of the pipe 6 are firmly adhered to each other to provide a reliable sealing property. The bolt 81 and the nut 82 can be easily tightened by using an electric tool such as an impact wrench without requiring a large work space.

According to such a method of use as the groove type joint, there is no room for welding sparks to be scattered and it is not necessary to rotate the pipe 6, so that there is a combustible material in the surroundings and it is not preferable to perform welding work. It is preferably used in a place where the scaffolding of the worker is bad and it is difficult to increase the tightening torque of the pipe, or in a place where the work space is small and it is difficult to rotate the unwinding pipe connected to the saddle 2.

In the pipe joint described above, the annular groove 24 of the saddle 2 may be formed by cutting a predetermined portion of the saddle wall in an annular shape, by rolling the saddle wall, or by forging the saddle 2. At this time, the annular groove 24 may be forged at the same time, and in the case of forging, it is preferable that the taper female screw portion 23 be forged and then cut and threaded.

In this embodiment, the welded branch saddle 2 for a fire hydrant was described as a pipe joint, but the pipe joint of the present invention is not limited to that for a fire hydrant.
It can be similarly applied to other fluid pipes. Of course, in some cases, the taper female screw portion 23 described in the embodiment may be replaced with a straight female screw portion.

[Advantages of the Invention] As described above, according to the present invention, when connecting a straight pipe or an unwinding pipe having a wide working space, the internal thread portion formed on the inner circumference of the tubular joint body is threaded. When the male threaded portion formed on the pipe end is screwed and fastened, the tubular joint body is used when connecting in locations where there is no risk of sparks spattering on the surrounding combustible material or work conditions where the pipe is bent and screwing cannot be performed. Insert the end of the pipe into the welded joint formed in the vicinity of the tip opening of the pipe, fillet weld the pipe to the welded joint, and perform welding work when flammable materials are present around the welded joint. When connecting in a place where it is difficult to rotate the pipe where the working space is small or where the tightening torque is difficult to increase, such as a large-diameter pipe where the scaffolding of the operator is bad An annular groove and a groove formed on the outer periphery of the joint body. By using a single cylindrical joint body that integrally forms an internal thread portion, a welded joint, an annular groove, and a packing contact bearing surface, such as using a bearing contact surface for packing, it is possible to reduce the working space. According to various conditions such as working environment and working conditions, any one of screw type joint, weld type joint and groove type joint can be selected and used. An effect that a good pipe connecting work can be performed is exhibited.

[Brief description of drawings]

FIG. 1 is a partial sectional view of a pipe joint according to an embodiment of the present invention, and FIG.
The figure is a plan view of the saddle, FIG. 3 is a partial sectional view showing an example of use as a screw type joint, FIG. 4 is a partial sectional view showing an example of use as a welding type joint, and FIG. 5 is a groove type joint. FIG. 6 is a partial sectional view showing a usage example, FIG. 6 is a perspective view of a packing and a coupling which are groove type joint parts, and FIG. 7 is a partially cutaway side view showing a usage state of a conventional example. 1 ... Pipe, 2 ... Saddle (pipe joint), 11 ... Pipe wall, 13
...... Tube line, 21 …… Tip opening, 22 …… Welding joint,
23 …… Tapered female thread (female thread), 24 …… annular groove, 25
…… Beat seat, 29 …… Internal passage of pipe fitting, 71 …… Packing.

Claims (1)

[Scope of utility model registration request] 1. A tubular pipe joint, which is welded to a pipe wall of a pipe body and has an internal passage communicating with the pipe line of the pipe body, the pipe joint body being provided at a location near a tip opening of the tubular joint body. Is formed with a joint for welding type joint that can be welded and joined by inserting the end of the pipe, and the inside of the tubular joint body adjacent to this welded joint on the inner side in the axial direction. A female thread portion for a threaded joint is formed on the circumference through an annular step portion, which is smaller in diameter than the welded joint portion and can be screwed and fastened with a male thread portion formed at the pipe end of the threaded pipe, and An annular groove is formed on the outer periphery of the tubular joint body adjacent to the welded joint on the axially inner side, and the outer surface of the tubular joint body on the tip opening side adjacent to the annular groove is formed. A pipe joint characterized in that a contact surface of a groove type packing is formed.