JPH0543345Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a connection structure between an unwinding pipe used as fire extinguishing equipment and a socket to which a sprinkler head is attached.

[Conventional technology]

Conventionally, in fire extinguishing equipment for sprinklers,
As shown in the figure, an unwinding pipe 3 is connected via a T-shaped joint 2 to a main pipe 1 through which extinguishing fluid such as water is supplied,
The sprinkler head S was attached to a socket 4 connected to the end of the unwinding pipe 3. The unwinding pipe 3 is formed by connecting a plurality of short pipes 3a, 3b, 3c with elbows 3d, 3e. Then, by adjusting the lengths of the short pipes 3a, 3b, and 3c as appropriate according to the current setting, the main pipe 1
The vertical distance between the branch point and the sprinkler head S, that is, the installation height of the sprinkler head S, and the installation position of the sprinkler head were set. F is a ceiling board.

However, it is troublesome to adjust the lengths of the short tubes 3a, 3b, and 3c.

Furthermore, since the connection between the unwinding pipe 3 and the socket 4 is made by screwing together a tapered male thread and a tapered female thread, it is difficult to set the threading allowance accurately in advance, and the short pipes 3a, 3
Even if the installation height of the sprinkler head S is adjusted by adjusting the current lengths of b and 3c, it will be necessary to make further fine adjustments by increasing or decreasing the threading allowance of the socket 4 to the end of the unwinding pipe 3. There are many. However, as mentioned above, since the connection between the unwinding pipe 3 and the socket 4 is made by screwing together the tapered male thread and the tapered female thread, it is necessary to increase or decrease the threading allowance of the socket 4, especially to reduce the threading allowance. This is not only undesirable in terms of maintaining the strength of the connection between the unwinding pipe 3 and the socket 4 and the sealing performance of the threaded portion, but also the adjustable range is extremely short (about one or two threads). This method is limited and cannot be said to be very effective.

On the other hand, the connection structure between the unwinding pipe and the socket disclosed in Japanese Utility Model Application No. 60-52488 connects the unwinding pipe and the socket by screwing together a parallel male thread and a parallel female thread. It's becoming like that. According to this, the installation height of the sprinkler head can be adjusted over a wider range by increasing or decreasing the threading allowance of the socket due to the characteristics of the parallel thread.

However, connections for fluid piping, such as those used in fire extinguishing equipment, are usually made by threading a tapered male thread and a tapered female thread, and a connection method by threading a parallel male thread and a parallel female thread is not adopted. Hateful. One of the reasons for this is the difficulty in ensuring sealing properties at the connection points. In the above-mentioned publication, this problem regarding sealing performance is solved by the following means.

That is, the parallel male threads of the socket are screwed into the parallel female threads of the outer cylinder connected to the unwinding pipe, and the two are connected so that the socket can move relative to the outer cylinder in the axial direction. Insert an O-ring between the outer cylinder and the socket, and use the elastic restoring force of the O-ring to press this O-ring against the straight inner surface of the outer cylinder (inner surface parallel to the axis) to seal the gap between the outer cylinder and the socket. That is.

[The problem that the idea aims to solve]

However, there are more than ten seals with O-rings.
Since high water pressure (kg/ ^cm2) is applied, it is recommended that the contact force between the O-ring, outer cylinder, and socket be strong enough to withstand the water pressure, so that when adjusting the installation height of the sprinkler head, the socket The force required to rotate the socket increases, making it difficult to rotate the socket, and requiring a special tool such as a spanner, which is troublesome.

On the other hand, if the force required to rotate the socket is reduced so that the socket can be rotated by hand, there is a trade-off problem in that the contact force is insufficient and it becomes difficult to achieve reliable sealing.

This idea was created in view of the above problems.
Basically, the unwinding pipe and the socket are connected by screwing a parallel male thread and a parallel female thread, and the installation height of the sprinkler head attached to the socket can be adjusted over a wide range by turning the socket by hand. In addition to doing so, ten
The object of the present invention is to provide a connection structure between a sprinkler unwinding pipe and a socket, which can secure sealing properties that can sufficiently withstand water pressure as high as Kg/cm ² .

[Means to solve the problem]

The connection structure between the sprinkler unwinding pipe and the socket of the present invention is such that a packing receiving part whose diameter expands outward is provided on one side of a threaded part in which a parallel female thread is formed, and the socket is extended into the threaded part. A connection structure between a socket having a connection port for a sprinkler head in a cylindrical part and a sprinkler unwinding pipe having a parallel male thread at the end, wherein the parallel male thread of the unwinding pipe is connected to the parallel female thread of the socket. is screwed in, and the ring-shaped first packing screwed onto the parallel male thread is tightened by the tightening nut screwed onto the parallel male thread, so that the tapered packing receiving surface of the packing receiving portion and the tightening nut are tightened. and the inner peripheral portion of the first packing closely fits and engages with the parallel male thread, and further,
A ring-shaped second packing screwed onto the parallel male thread is tightened by a lock nut screwed onto the parallel male thread, and tightly contacts the upper surface of the tightening nut and the tapered packing receiving surface formed on the lock nut. and the inner circumferential portion of the second packing closely engages with the parallel male screw.

[Effect]

In the present invention, when the lock nut and tightening nut are loosened, the socket can be easily rotated by hand in the forward or reverse direction. When the socket is rotated in the forward or reverse direction, the socket is moved up and down depending on the direction and amount of rotation.

Further, the socket is prevented from loosening not only by the lock nut but also by the tightening nut. Then, at the connecting tube place, the first packing is in close contact with the tapered packing receiving surface of the packing receiving part provided in the socket and the lower surface of the tightening nut, and the inner peripheral part thereof is in close contact with the parallel male screw. interlocking, and
The second packing is in close contact with the upper surface of the tightening nut and the tapered packing receiving surface formed on the lock nut, and its inner circumference is tightly engaged with the parallel male screw, thereby creating a double seal. be done.
In particular, the first and second packings, whose inner peripheries closely engage with the parallel male threads of the unwinding tube, were previously screwed into the parallel male screws provided at the end of the unwinding tube. , its inner circumference reliably comes into close contact with the crests and troughs of the parallel male thread.

〔Example〕

Figure 1 shows two S-shaped tubes 51 and 52 and a U-shaped tube 53.
The sprinkler unwinding pipe 5 formed by connecting the above is connected to the extinguishing fluid distribution pipe (for example, a water supply main pipe) 1 in a branched manner via the saddle 11, and the unwinding pipe 5 and the socket 4 are connected. 3 shows a state connected by a connection structure according to an embodiment of the present invention.

A short tube 54 formed by a nipple or the like having a parallel male thread 55 is connected to the end of the unwinding tube 5. With this configuration, the end of the unwinding tube 5 is provided with a parallel male thread 55. ing.

The socket 4 is provided with a packing receiving part 43 having an outwardly tapered diameter on one side of a threaded part 42 having a parallel female thread 41 formed on its inner surface, that is, at one end of the socket 4. The other side, that is, the gasket receiving part 4 with the threaded part 42 in between.
A bulging portion 44 having a larger diameter than the threaded portion 42 is provided on the opposite side of the screw portion 3 . In addition, the bulging portion 4
A cylindrical portion 45 extends from the cylindrical portion 4.
A connection port 36 for the sprinkler head S is provided at the top. The length of the bulging portion 34 is relatively long.

The effective length of the parallel male thread 55 is sufficiently longer than the effective length of the parallel female thread 41. As shown in detail in FIG. 2, the parallel female thread 41 of the threaded portion 42 of the socket 4 is screwed into the parallel male thread 55, and the ring-shaped first packing 61 is screwed onto the parallel male thread 55. is tightened by the tightening nut 7 screwed onto the parallel male thread 55, and the above-mentioned packing receiving portion 43 is in a compressed state.
The tapered packing receiving surface 43a and the tightening nut 7
It is in close contact with the lower surface 7a of the. Further, the inner circumferential portion 61a of the first packing 61 is tightly engaged with the parallel male screw 55 in a compressed state. In addition,
The lower surface 7a of the tightening nut 7 is pressed against the end surface of the seal receiving portion 43. FIG. 5 shows the tightening nut 7.

Further, as shown in detail in FIG. 2, the ring-shaped second packing 62 screwed onto the parallel male screw 55 is tightened and compressed by the lock nut 8 screwed onto the parallel male screw 55. The locking nut 8 has a concave tapered packing receiving surface 8a and the upper surface 7b of the tightening nut 7.
It is closely attached to. Furthermore, the parallel male screw 5 is
It is closely interlocking with 5. The flat lower surface 8b of the lock nut 8 is pressed against the upper surface 7b of the tightening nut 7, and the socket 4 is prevented from loosening by the cooperation of the lock nut 8 and the tightening nut 7. FIG. 4 shows the lock nut 8.

As shown in detail in FIG. 6, the first packing 61
A parallel female thread 64 is formed on the inner periphery of a rubber packing main body 63 having a bullet-shaped cross-sectional shape in an uncompressed state, and this parallel female thread 64 is screwed into the parallel male thread 23. In addition, a Teflon coating 65 is applied to the outer surface to improve sliding properties with the parallel male screw 55, and at the same time, the excellent heat resistance of the Teflon coating 65 increases the fire resistance of the first packing 61 as a whole. ing. The maximum outer circumferential diameter of the first packing body 61 is set to be equal to the maximum diameter of the inner circumferential surface of the packing receiving part 43, and the number of threads of the parallel female thread 64 is 2.
It is set to ~3. Furthermore, parallel female thread 64
The valley has a sharp V-shaped cut. The second gasket 62 is the same as the first gasket 61.

According to the above connection structure, the first packing 61 is securely in surface contact with the packing receiving surface 43a of the packing receiving part 43, the lower surface 7a of the tightening nut 7, and the parallel male thread 55 due to its elastic restoring force. This ensures a highly reliable seal (generally liquid or water tight). Similarly, the second packing 6
2 is firmly in close contact with the upper surface 7b of the tightening nut 7, the tapered packing receiving surface 8a of the locking nut 8, and the parallel male thread 55 due to its elastic restoring force in a state of surface contact, resulting in a highly reliable seal. gender is ensured.
Therefore, the first packing 61 and the second packing 6
2 ensured high sealing properties, and moreover, they exerted a double sealing action to maintain even more reliable sealing properties, and the internal passage of the unwinding tube 4 was filled with more than 10 kg/cm ² . Even if high-pressure water is supplied, water leakage will not occur.

To adjust the installation height of the sprinkler head, all you have to do is loosen the lock nut 8 and tightening nut 7 and rotate the socket 4 a predetermined amount in the forward or reverse direction, as shown in Figure 3. Since the rotation can be easily performed by hand, the installed height of the sprinkler head can be adjusted easily, quickly and accurately. After adjusting the installation height of the sprinkler head,
Tighten the tightening nut 7 and locking nut 8. When tightening the tightening nut 7, use the first packing 61 that has been fitted shallowly into the parallel male screw 55 in advance.
Screw it in while rotating it together with the tightening nut 7. Similarly, when tightening the lock nut 8, the second gasket 62 is screwed in while rotating together with the lock nut 8. In FIG. 3, arrows X and Y indicate the direction in which the tightening nut 7 and lock nut 8 extend when tightened.

In the unwinding tube 5 shown in FIG.
The connection tube place A between the shaped tubes 51 and 52, and the S-shaped tube 51
and the U-shaped tube 53 may be connected to each other by using a parallel male thread and a parallel female thread, and may have a double seal configuration similar to the connection structure of the present invention. Of course.

Furthermore, in this embodiment, the first gasket 61 and the second gasket 62 are made of rubber, but
These gaskets may be made of metal. It is desirable for such a metal packing to be finished to the extent that the parallel female threads on the packing side come into close surface contact with the parallel female threads on the unwinding tube side.

[Effect of idea]

As described above, according to the present invention, by screwing together the parallel male thread and the parallel female thread, it is possible to finely adjust the installation height of the sprinkler head over a wide range, and also by simply turning the socket by hand. The installation height of the sprinkler head attached to the socket can be easily, quickly and reliably adjusted. Therefore, the troublesome work involved in adjusting the socket by rotating it using a special tool as in the past is eliminated.

Nevertheless, the first seal and the second seal not only individually exert a reliable sealing effect, but also work together to exert a double sealing effect, so that more reliable sealing performance is maintained. It drips and provides a reliable seal even when extinguishing fluids such as water are delivered at high pressures.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view showing how the connection structure according to the embodiment of the present invention is used, Fig. 2 is an enlarged cross-sectional view showing the main parts of the connection structure, and Fig. 3 shows the tightening nut and lock nut. Fig. 4 is a plan view of the locking nut seen from below; Fig. 5 is a plan view of the tightening nut seen from below;
FIG. 6 is a sectional view for explaining the cross-sectional shape of the first packing, and FIG. 7 is a longitudinal sectional side view of a conventional example. 4... Socket, 5... Unwinding pipe, 7... Tightening nut, 7a... Lower surface of tightening nut, 7b... Upper surface of tightening nut, 8... Lock nut, 8a...
Packing receiving surface of lock nut, 41...parallel female thread of threaded part, 43... packing receiving part, 43a...
Packing receiving surface, 44... bulging part, 45... cylindrical part,
46... Connection port, 55... Parallel male thread of unwinding pipe, 61... First packing, 61a... Inner peripheral part of first packing, 62... Second packing, 62a...
...Inner circumference of second packing, S...Sprinkler head.

Claims (1)

[Claims for Utility Model Registration] A packing receiving part with an outwardly expanding diameter is provided on one side of a threaded part in which a parallel female thread is formed, and a connection port for a sprinkler head is provided in a cylindrical part extending from the threaded part. A connection structure between a socket provided with a socket and a sprinkler unwinding pipe having a parallel male thread at the end, wherein the parallel female thread of the socket is screwed into the parallel male thread of the unwinding pipe, and the parallel male thread is screwed into the parallel male thread. The threaded first ring-shaped packing is tightened by a tightening nut screwed onto the parallel male thread thereof, and is brought into close contact with the tapered packing receiving surface of the packing receiving portion and the lower surface of the tightening nut, and The inner peripheral part of the first packing closely engages with the parallel male thread,
Furthermore, a ring-shaped second packing threaded onto the parallel male thread is tightened by a lock nut threaded onto the parallel male thread, so that the upper surface of the tightening nut and the tapered packing receiving surface formed on the lock nut are connected to each other. A connection structure between a sprinkler unwinding pipe and a socket, characterized in that the inner circumferential portion of the second packing closely engages with the parallel male thread.