JP2017086189A - Connecting structure for fire-extinguishing equipment pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint structure capable of providing stable sealing performance by thread connection even by an inexperienced person.SOLUTION: A connecting structure for fire-extinguishing equipment pipe has a dual structure formed by an outer cylinder 12 and an inner cylinder 13. The outer cylinder 12 comprises a female joint 1 in which a female screw 14 is installed, and a male joint 2 including a male screw 25 to threadedly engage with the female screw 14 of the outer cylinder 12. The inner cylinder 13 includes: at one end side thereof, a pipe part 22 extending to the outside of the outer cylinder 12; and, at the other end side, an annular seal 19 installed inside the female screw 14. A stopper 21 allowing the outer cylinder 12 to move along the inner cylinder 13 within a prescribed range is provided between the outer cylinder 12 and the inner cylinder 13. When the female screw 14 and the male screw 25 are threadedly engaged, the seal 19 comes into contact with the inside of the male screw 25.SELECTED DRAWING: Figure 2

Description

The present invention relates to the structure of a pipe joint, and more particularly to the structure of a pipe joint used for fire extinguishing equipment piping.

Sprinkler equipment is installed in buildings, shopping centers, etc., which store water for extinguishing fire, sprinkler heads for spraying water, piping for fire extinguishing equipment connecting water tanks and sprinkler heads, water for water tanks Is composed of equipment such as a pump for feeding water to the sprinkler head. Fire extinguishing equipment piping is filled with pressurized water.

Since the sprinkler head is mainly installed on the ceiling surface, the fire-extinguishing equipment piping is also laid at a high position in the room such as the back of the ceiling. For this reason, the construction of fire extinguishing equipment piping was a high-place work and was a heavy burden on the workers.

The fire-extinguishing equipment pipe is branched from the main pipe leading to the water source by a multi-joint joint and connected to the sprinkler head via a flexible pipe such as a metal flexible pipe or a resin pipe. The connection structure between the flexible tube and the multi-neck joint is a screw structure. After a seal tape is wound around the threaded portion, it is screwed in with a predetermined torque so that the seal tape bites into the threads and seals. Sex is obtained.

However, if a person unaccustomed to the work performs the above work, leakage may occur. The leaked part was reworked, which was a factor in reducing work efficiency. Further, in the above work, it is necessary to use a dedicated tool for screwing with a predetermined torque.

In recent years, the use of quick pipe joints that do not use screws (for example, see Patent Document 1) and resin pipes that can be fusion-bonded (for example, see Patent Document 2) can improve work efficiency and burden the operator. Can be reduced. However, if these joints are used and the pipes are detached from the joints due to poor joints, a large amount of water may be discharged into the room to cause water damage. Therefore, there is a view that the use of the above-described screw connection structure has a lower risk of water loss due to poor construction.

JP 2006-226532 A JP 10-118219 A

Therefore, in view of the above, an object of the present invention is to provide a pipe joint structure that enables a person who is unfamiliar with work to obtain a stable sealing performance by screw connection.

In order to achieve the above object, the present invention provides the following pipe joint structure.
In other words, the inner cylinder is composed of a female joint having a double structure of an outer cylinder and an inner cylinder, in which a female screw is installed in the outer cylinder, and a male joint having a male screw that is screwed with the female screw of the outer cylinder. One end of the tube is provided with a pipe part that extends to the outside of the outer cylinder, and the other end is provided with an annular seal inside the female screw, so that the outer cylinder can move within a predetermined range along the inner cylinder In the state where the stopper is provided between the outer cylinder and the inner cylinder, and the female screw and the male screw are screwed together, the seal is in contact with the inside of the male screw.

The female joint has a double structure of an outer cylinder and an inner cylinder, a female screw is provided on the outer cylinder side, and an annular seal is installed on the inner cylinder side. In addition, by installing a male screw on the outer periphery of the male joint that is screwed to the female screw, and making the inner peripheral side a sealing surface that comes into contact with the female joint seal, a stable seal is maintained without being affected by the skill of the operator. Performance can be obtained.

When using the pipe joint structure of the present invention for fire extinguishing equipment piping, connect the inlet side of the multi-joint to the fire extinguishing equipment pipe connected to the water source, use the male joint structure on the outlet side, and A female joint structure can be used for the piping installed between the side and the sprinkler head. The pipe part provided on the one end side of the inner cylinder can be a metallic flexible pipe or a resin pipe.

The outer cylinder of the female joint has an engagement structure that is rotatable about the axis with respect to the inner cylinder, and can be screwed by rotating only the outer cylinder when connecting the male and female joints. Thereby, since it can screw together without rotating the inner cylinder provided with a pipe part, even when the pipe part has a length of several meters, a pipe joint can be connected easily.

In addition to this, by providing a locking member that prevents loosening of the male screw and female screw, it is possible to maintain a screw connection state and a stable sealing performance over a long period of time. A specific structure of the locking member may be a structure that is inserted from the female screw side to the male screw side, or a structure that is inserted into a hole or groove on the male screw side through an opening formed on the female screw side. . Furthermore, the locking member can be installed not only at one place but also at a plurality of places.

As the stopper, a step where the inner cylinder is locked can be installed between the female screw of the outer cylinder and the pipe portion. Alternatively, a stop ring in which the step of the outer cylinder is locked can be installed between the annular seal of the inner cylinder and the pipe portion. Thus, a female joint in which the outer cylinder is rotatably incorporated with respect to the inner cylinder can be configured.

As described above, according to the present invention, it is possible to realize a pipe joint structure that can obtain a stable sealing performance regardless of the skill of an operator. Furthermore, by providing a locking member that prevents the screw part from loosening, it is possible to maintain a screw connection state and a stable sealing performance over a long period of time.

The figure which shows the installation state of the pipe joint of 1st Embodiment provided with the connection structure of fire extinguishing equipment piping of this invention. The principal part sectional drawing of the pipe joint of FIG. XX sectional drawing shown in FIG. Drawing before the connection of the pipe joint of FIG. The principal part sectional view of a 2nd embodiment. The figure which shows the modification of 2nd Embodiment. The figure which shows the modification of a lock ring.

1st Embodiment (FIGS. 1-4)
A pipe joint J1 having the fire extinguishing equipment piping connection structure of the first embodiment includes a female joint 1 and a male joint 2.

As shown in FIG. 1, the female joint 1 is installed on the other end side of a metal flexible pipe 22 to which the sprinkler head 3 is connected on one end side. As shown in FIG. 2, the female joint 1 has a double cylinder structure including an outer cylinder 12 and an inner cylinder 13. The outer cylinder 12 has a hollow cylindrical shape, and the cross-sectional shape is a polygonal shape such as a hexagon or an octagon as shown in FIG. 3, and a female screw 14 is installed inside the upper end side in the figure. Has been. The female screw 14 can be screwed with the male screw 25 of the male joint 2.

A step 15 is provided inside the lower end of the outer cylinder 12 opposite to the side where the female screw 14 is installed. A plurality of openings 16 are formed between the female screw 14 and the step 15, and an annular groove 17 is provided at a position where the opening 16 is formed on the outer periphery of the outer cylinder 12.

A lock ring 18 shown in FIG. 3 is installed in the annular groove 17. The lock ring 18 is formed of an elastic material, and is a locking member that prevents the female screw 14 and the male screw 25 from loosening. A part of the ring of the lock ring 18 is notched, and a position corresponding to the opening 16 is a lock portion 18a bent to the center side.

When the lock ring 18 is fitted in the annular groove 17, the lock portion 18 a projects from the inner peripheral surface of the outer cylinder 12 toward the inner cylinder 13 (see FIG. 3). In this state, the width of the annular groove 17 is preferably set to several mm to 10 mm so that the lock ring 18 cannot be intentionally removed.

The inner cylinder 13 is installed inside the outer cylinder 12. The inner cylinder 13 has a cylindrical shape, and the inside is a flow passage through which a fluid can pass. In the drawing, the upper end of the inner cylinder 13 is inserted into the inner side of the outer cylinder 12, and O-rings 19 and 19 are provided as annular seals on the outer peripheral surface of the insertion portion.

In the inner cylinder 13, the step 20 is installed in the vicinity of the step 15, and the outer diameter on the side where the O-rings 19, 19 above the step 20 are installed is larger than the outer diameter of the portion below the step 20. ing. The steps 15 and 20 have an engagement structure in which the outer cylinder 12 is rotatable about the axis with respect to the inner cylinder 13. More specifically, in a state where the step 15 and the step 20 are engaged, only the outer cylinder 12 can be rotated around the axis and screwed into the male screw 25.

Further, a ring-shaped stopper 21 is provided on the outer peripheral surface below the step 20, and the step 15 is locked by the stopper 21 to restrict downward movement. The outer cylinder 12 can move within a predetermined range along the inner cylinder 13 by the step 20 and the stopper 21, and the inner cylinder 13 is prevented from coming out of the outer cylinder 12. Further, the outer cylinder 12 is configured to be able to idle with respect to the inner cylinder 13.

Below the stopper 21 of the inner cylinder 13, it joins with the flexible piping 22 which is a pipe part by welding. The flexible pipe 22 is long and has a length of several meters. When the female screw 14 and the male screw 25 are screwed together, only the outer cylinder 12 on which the female screw 14 is installed is rotated to provide the male screw 25. Since it is not necessary to rotate the flexible pipe 22, the working efficiency can be improved.

As shown in FIG. 1, the male joint 2 is installed in the multi-joint 11 in which many male screws 25 are installed. The male joint 2 has a cup shape and is provided with a plurality of male screws 25 on the side surface. The upper end of the male joint 2 is connected to a fire extinguishing equipment pipe 4 connected to a water supply source, and the lower end is a bottom surface.

The inside of the male screw 25 is hollow and allows fluid to pass therethrough. The male screw 25 can be screwed with the female screw 14 described above, and the inner side of the male screw 25 contacts the O-rings 19 and 19 in a state of being screwed with the female screw 14. The water supplied from the fire extinguishing equipment pipe 4 can be supplied to the sprinkler head 3 through the pipe joint J1 through the inside of the male screw 25.

A slope 26 is formed at the outer peripheral end on the tip side of the male screw 25. The tip of the slope 26 is disposed closer to the center axis (not shown) of the pipe joint J1 than the tip of the lock portion 18a of the lock ring 18.

An annular lock groove 27 is provided between the slope 26 and the male screw 25. The lock groove 27 can be engaged with the lock portion 18a. A step 28 larger than the outer diameter of the male screw 25 is formed on the root side of the male screw 25, and the female screw 14 and the male screw 25 are screwed to a position where the end surface of the step 28 and the end surface of the female joint 1 are in contact with each other. Combine. Accordingly, the lock groove 27 and the lock portion 18a are set at appropriate positions.

The lock ring 18 is used in a joint described in Japanese Patent Application Laid-Open No. 2004-52839. Since this joint is not premised on removing the connected resin pipe, the screw once tightened is held as it is. The In contrast, in the present invention, the female joint 1 and the male joint 2 are detachable, and the method of using the lock ring 18 is different from that of Japanese Patent Application Laid-Open No. 2004-52839.

More specifically, in the present application, in order to prevent the female screw 14 and the male screw 25 from rotating in the loosening direction, the lock portion 18a is inserted into the opening 16 and the tip of the lock portion 18a is engaged with the lock groove 27. ing. As a result, when the screw is to be rotated in the loosening direction, the tip of the lock portion 18a hits the side surface 27a of the lock groove 27 and rotation is prevented.

On the other hand, in Japanese Patent Application Laid-Open No. 2004-52839, the lock portion 18a is inserted into the male screw side hole and the female screw side hole in a state where the screw is screwed together, thereby preventing the screw from rotating. For this reason, a highly precise processing technique is required so that the positions of the holes overlap in a screwed state. In the present invention, since the rotation is prevented by the side surface 27a of the lock groove 27 as described above, there is an advantage that the processing becomes easy.

In the structure of the female joint 1 and the male joint 2 described above, it is preferable to make the end portion into a tapered shape or a curved surface shape or chamfering in order to smoothly connect the components. Furthermore, if the shape of the female screw 14 and the male screw 25 is a multi-threaded structure, it can be quickly screwed with a small number of rotations.

Next, a connection procedure between the female joint 1 and the male joint 2 described above will be described.

The multi-joint 11 in which the male joint 2 is installed is connected to the end of the fire extinguishing equipment piping 4 installed in the upper part of the room. First, the female screw 14 of the outer cylinder 12 of the female joint 1 is screwed into the male screw 25 of the male joint 2. At this time, since the outer cylinder 12 is idle with respect to the inner cylinder 13, the inner cylinder 13 does not have to be rotated when the female screw 14 and the male screw 25 are screwed together.

When the female screw 14 and the male screw 25 are screwed together, the slope 26 at the tip of the male screw 25 contacts the tip of the lock portion 18 a of the lock ring 18. When the screw is further tightened, the tip of the lock portion 18 a is elastically deformed in the direction of the outer cylinder 12 by the inclined surface 26, and the lock portion 18 a gets over the inclined surface 26 and engages with the lock groove 27. When the screw is tightened until the end face of the female joint 1 comes into contact with the step 28, the connection is completed.

In the above, the O-rings 19 and 19 are brought into contact with the inner peripheral surface of the male screw 25 in a sealed state in the process of screwing the female screw 14 and the male screw 25. Further, after the connection between the female joint 1 and the male joint 2 is completed, the inner cylinder 13 is rotatable, and is easily installed when the sprinkler head 3 installed at the tip of the flexible pipe 22 is fixed to the ceiling base material 5. be able to. Further, the stopper 21 prevents the inner cylinder 13 from coming out of the outer cylinder 12, and the O-rings 19 and 19 can always be kept in hermetic contact with the inner peripheral surface of the male screw 25.

Further, since the lock portion 18a is engaged with the lock groove 27, the female screw 14 and the male screw 25 cannot be rotated, and it is possible to prevent the screw from being loosened due to vibration after connection.

When a sound is generated when the lock portion 18a is engaged with the lock groove 27, it can be confirmed that the lock portion 18a is engaged with the lock groove 27 by the sound.

To remove the female screw 14 and the male screw 25, the screw can be rotated by removing the lock ring 18 from the annular groove 17 by hooking the tip of a tool such as a screwdriver to the lock ring 18 in the annular groove 17. Thus, the female screw 14 and the male screw 25 can be removed.

Second Embodiment (FIG. 5)
The pipe joint J2 of 2nd Embodiment shown in FIG. 5 comprises the pipe part of an inner cylinder so that attachment or detachment is possible. Hereinafter, although 2nd Embodiment is described, the same code | symbol is attached | subjected about the location same as 1st Embodiment, and description is abbreviate | omitted.

The inner cylinder 31 of the second embodiment has a cylindrical shape, and the configuration above the step portion 15 accommodated in the outer cylinder 12 is the same as that of the first embodiment. On the outer periphery below the step portion 15, a male screw 32 for connection with the flexible pipe 22 that is a pipe portion is engraved.

The flexible pipe 22 has a sprinkler head 3 connected to one end side. The other end is joined to the cap nut 33 by welding or the like, and a female screw 34 that can be screwed with the male screw 32 is engraved on the inner side. Inside the cap nut 33, the end 22 a of the flexible pipe 22 has a tapered shape, and has a shape along the inclined surface 35 inside the cap nut 33.

On the other hand, the front end of the male screw 32 of the inner cylinder 31 has a tapered shape along the inclined surface 35, and when the male screw 32 and the female screw 34 are screwed together, the tapered portion of the front end of the male screw 32 becomes the flexible pipe 22. Since it is pressed against the inclined surface 35 with the inclined surface 22a sandwiched therebetween, the flexible pipe 22 and the cap nut 33 can be firmly fixed.

When connecting the pipe joint J2 to the male joint 1, the female screw 14 and the male screw 25 are screwed together in a state where the male screw 32 and the female screw 34 are screwed in advance.

In the fire extinguishing equipment piping connection structure described in the above two embodiments, the structure of the female joint 1 is applied to the outlet side of the multi-joint joint, and the structure of the female joint 2 screwed with the female joint 1 is used as a sprinkler. It can also be used for piping to which the head is connected. FIG. 6 shows the connection structure of the second embodiment in which the female joint 1 is installed on the multi-joint joint 11 side and the male joint 2 is applied to an adapter 40 having a flexible pipe 22 to which a sprinkler head 3 is connected. .

Further, the lock ring 18 can be configured by using a lock ring 41 shown in FIG. The lock ring 41 is a ring shape having a notch, and includes a plurality of lock portions 41a that are curved toward the center of the ring at a predetermined interval.

In FIG. 7, the opening 42 is installed at a position corresponding to the lock portion 41a, and three openings 42 are installed in the figure. The opening 42 is provided with a slope 43 along the lock portion 41a. When the lock ring 41 is removed from the annular groove 17, the lock portion 41a moves along the slope 43 so that the lock ring 41 can be removed smoothly. it can.

J1, J2 Pipe fitting 1 Female fitting
2 Male coupling
3 Sprinkler head
4 Fire fighting equipment piping
5 Ceiling base materials
11 Multi-neck joint 12 Outer cylinder
13, 31 Inner cylinder
14, 34 Female screw
15, 20, 28 steps
16, 42 opening
17 annular groove
18, 41 Lock ring
19 O-ring
21 Stopper
22 Flexible piping
25, 32 male screw
26, 35 slopes
27 Lock groove
33 Cap nut
40 adapter

Claims (13)

It consists of a female joint in which the outer cylinder and the inner cylinder have a double structure and a female screw is installed in the outer cylinder, and a male joint that has a male screw that engages with the female screw of the outer cylinder.
One end side of the inner cylinder is provided with a pipe portion extending to the outside of the outer cylinder, and the other end side is provided with an annular seal inside the female screw,
A stopper that allows the outer cylinder to move within a predetermined range along the inner cylinder is provided between the outer cylinder and the inner cylinder,
In the state where the female screw and the male screw are screwed together,
Fire extinguishing equipment piping connection structure, characterized in that the seal contacts the inside of the male screw. 2. The fire fighting equipment piping connection structure according to claim 1, wherein the male screw is installed on the outlet side of the multi-joint joint. The fire extinguishing equipment piping connection structure according to claim 1 or 2, wherein an inlet side of the multi-joint joint is connected to the fire extinguishing equipment piping. The fire extinguishing equipment piping connection structure according to any one of claims 1 to 3, wherein the inside of the screw is a flow passage. The fire extinguishing equipment piping connection structure according to any one of claims 1 to 4, wherein the inside of the male screw and the pipe portion are connected so that fluid can pass therethrough.   The fire extinguishing equipment piping connection structure according to any one of claims 1 to 5, wherein the pipe portion is a metallic flexible piping.   6. The fire extinguishing equipment piping connection structure according to any one of claims 1 to 5, wherein the pipe portion is a resin pipe. The sprinkler head connection structure according to any one of claims 1 to 7, wherein a sprinkler head is connected to one end side of the inner cylinder via a pipe portion. The fire fighting equipment piping connection structure according to any one of claims 1 to 8, wherein the outer cylinder includes an engagement structure that is rotatable about an axis with respect to the inner cylinder. The fire extinguishing equipment piping connection structure according to any one of claims 1 to 9, wherein the outer cylinder includes a locking member that prevents loosening of the female screw and the male screw. The fire-extinguishing equipment piping connection structure according to claim 10, wherein the locking member has a structure inserted from the female screw side to the male screw side. The fire-extinguishing equipment piping connection structure according to claim 10 or 11, wherein the locking member is configured to be inserted into a hole or groove on the male screw side through an opening on the female screw side. The fire extinguishing equipment piping connection structure according to any one of claims 1 to 12, wherein the pipe portion is detachably attached to the inner cylinder.

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