JP2018183577A - Pipe joint for fire-extinguishing equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint for fire-extinguishing equipment capable of reducing burdens of workers in construction work of pipe joints for the fire-extinguishing equipment and shortening a work time.SOLUTION: The pipe joint for fire-extinguishing equipment includes: a body 1 having a cylindrical shape and including a connection part to a fire-extinguishing equipment pipe, at an end part; branch pipes 2 installed on a lateral surface of the body 1; female screws 5 installed at end-part inner peripheries of the branch pipes 2; and seal parts 6 disposed at inner sides of the female screws 5. An inner periphery diameter of each seal part 6 is smaller an inner periphery diameter of each female screw 5, and the thickness of the end part of the branch pipe 2 in which the female screw 5 is installed is made thinner than the wall thickness of a part in which the seal part 6 is installed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pipe joint connection structure for fire extinguishing equipment.

  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.

  The sprinkler head is mainly installed at a high position such as directly below the roof in a building without a ceiling surface or a ceiling such as a warehouse. Therefore, fire extinguishing equipment piping that sends water from the water storage tank to the sprinkler head is laid at a high position in the room. Work to connect. Therefore, the construction of fire extinguishing equipment piping was a work at a high place where the foot was unstable, and the burden on the worker was great.

  The fire-extinguishing equipment pipe is connected to the sprinkler head via a flexible pipe such as a metal flexible pipe or a resin pipe by branching the main pipe leading to the water storage tank with a multi-joint joint. The diameter of the connection part between the flexible tube and the multi-joint joint is mainly 16A to 25A, and the connection structure is a taper screw structure for pipes. After a seal tape is wound around the thread part, a predetermined torque is applied. As a result, the sealing tape is digged between the threads and the sealing property is obtained.

  However, if a person unaccustomed to the above work performs the above work, leakage may occur due to poor construction. 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. More specifically, a metal wrench or spanner is used as a dedicated tool, and the work of connecting a flexible tube to a multi-joint joint installed overhead using this metal heavy tool is as follows. The burden on the worker was great.

In recent years, the use of a quick pipe joint that does not use screws (see, for example, Patent Document 1) can improve work efficiency and reduce the burden on the operator. However, when the above-described joint is used and the pipe is detached from the joint due to poor bonding, a large amount of water may be discharged into the room, resulting in 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.

JP2015-175494A

  Then, in view of the said problem, in this invention, it aims at providing the fire-extinguishing equipment coupling which can reduce an operator's load in construction work of fire-extinguishing equipment piping, and can shorten work time.

In order to achieve the above object, the present invention provides the following pipe joint for fire extinguishing equipment.
That is, it is cylindrical, and has a main body having a connection portion with a fire extinguishing equipment pipe at the end, a branch pipe installed on the side of the main body, a female screw installed on the inner periphery of the end of the branch pipe, and a female screw The inner diameter of the seal portion is smaller than the inner diameter of the female screw, and the thickness of the end of the branch pipe where the female screw is installed It is a pipe joint for fire extinguishing equipment that is thinner than the wall thickness of the place where it is installed.

  The pipe joint for fire extinguishing equipment having the above structure has a structure in which a female screw and a seal portion are sequentially installed from the end side of the branch pipe so that the fluid inside the main body is sealed by the seal portion so that the fluid does not reach the female screw. This prevents fluid pressure from being applied to the location where the female screw is installed. Moreover, since the female screw does not contact the fluid inside the main body, the female screw portion can be made thin without causing corrosion.

  Furthermore, by forming the female screw as a parallel screw, the work of tightening with a predetermined torque like a conventional taper screw is eliminated, and the connection work can be performed without using a tool such as a wrench or a spanner. When the female screw is screwed, the end face of the branch pipe is screwed in until it comes into contact with a contact surface installed on the outer periphery of a piping member (hereinafter referred to as “male piping member”) provided with a male screw. Thereby, the operator can recognize that the male screw and the female screw are sufficiently screwed together and are in a fastening state, and that the water stop member acts on the seal surface. In addition, even inspectors who check the connection location of fire extinguishing equipment piping, check whether the end face of the branch pipe and the contact surface of the male pipe member are in contact with each other, thereby confirming whether the male screw and female screw are fastened and water-stopping. It can be recognized that the member acts on the sealing surface.

  On the other hand, it is possible to form the female screw with a taper screw. With such a configuration, it is possible to connect to a general-purpose taper male screw.

  In addition, with regard to the water stop structure between the male pipe member and the branch pipe, stable water stop performance can be obtained by using an annular water stop member such as an O-ring instead of water stop by a conventional seal tape. . Further, it is possible to save the trouble of winding the sealing tape as in the prior art. Further, since the connection work is a conventional screw structure, the connection procedure is the same as the conventional one, and the operator can easily understand intuitively.

  When an O-ring is used as the water-stopping member, frictional resistance generated when the O-ring is crushed becomes a load on the operator and is one factor in reducing work efficiency. In the above-described pipe joint for fire extinguishing equipment, the water stop member is crushed by the movement when the male pipe member is screwed into the female screw of the branch pipe, so the load on the operator is reduced. Moreover, when installing several water stop members, the movement amount required in order to crush a water stop member, ie, screw length, can be shortened by installing the water stop member from which size differs.

  In addition, when releasing the female screw and male screw, the male screw and female screw are screwed even when the water-stopping member is away from the seal. Even in a state where the pressure is pressurized, the male pipe member is prevented from being pulled out by the pressure of the fluid.

Furthermore, the outer periphery of the tip of the branch pipe has an annular groove, and a female screw is installed inside the annular groove. An indicator that can be installed after the male screw and female screw are fastened can be installed in the annular groove. The indicator can be attached to the position of the annular groove when the end face of the branch pipe is in contact with the male pipe member, and the indicator attached state indicates that the male screw and female screw are connected without any problem. Yes. Although the female screw is installed inside the annular groove, as described above, the fluid inside the main body does not reach the female screw, so there is no problem in the water stopping performance even if the wall thickness is reduced by the annular groove.

As described above, according to the present invention, it is possible to realize a fire-extinguishing equipment joint that can reduce the load on the operator and shorten the work time in the construction work of the fire-extinguishing equipment.

The perspective view of the pipe joint for fire extinguishing equipment of 1st Embodiment. The pipe installation state figure in which the joint of Drawing 1 was installed. The front view of the coupling of FIG. XX sectional drawing of FIG. 3 is a detailed cross-sectional view of the joint portion of FIG. (A) is the external view of an indicator, (b) is the external view seen from the arrow A direction of (a). The modification about arrangement | positioning of the O-ring of 1st Embodiment. The perspective view of the coupling of a 2nd embodiment. Sectional drawing of the coupling of FIG. Sectional drawing of the coupling of 3rd Embodiment. Sectional drawing of the modification 1 of the coupling of 3rd Embodiment. Sectional drawing of the modification 2 of the coupling of 3rd Embodiment.

1st Embodiment (FIGS. 1-7)
FIG. 1 shows a pipe joint T1 for fire extinguishing equipment (hereinafter referred to as a joint T1) according to the first embodiment. Moreover, the state which connected joint T1 of FIG. 1 to fire extinguishing equipment piping is shown in FIG.

  As shown in FIGS. 1 and 2, the main body 1 of the joint T1 has a cylindrical shape through which a fluid can pass. The upper end is connected to the water supply pipe P by a screw structure, and the lower end is closed. A plurality of branch pipes 2 are installed on the side surface of the main body 1 and connected to one end of the flexible pipe F. A sprinkler head S is installed on the other end side of the flexible pipe F. The lower end of the sprinkler head S is installed so as to protrude from the ceiling C to the indoor side. The water supply pipe P and the flexible pipe F are installed substantially parallel to the ceiling C. The flexible pipe F is composed of a metal flexible pipe or a resin pipe.

  A plurality of branch pipes 2 are installed on the side surface of the main body 1, and the branch pipes 2 can be provided at two to six locations on the side surface of the main body. In this embodiment, four places are installed. The branch pipe 2 is a tubular pipe line, and the pipe line communicates with the inside of the main body 1. The outer diameter of the branch pipe 2 is smaller than the outer diameter of the main body 1, and the branch pipe 2 is installed in the radial direction from the side surface of the main body 1.

  A flange portion 3 is installed at the outer peripheral end of the branch pipe 2, and an end surface of the flange portion 3 is a contact surface with a flange portion 34 described later. An annular groove 4 is engraved in the vicinity of the flange 3. A ring 41 of an indicator 40 described later is inserted into the annular groove 4. A female screw 5 is provided on the inner peripheral side of the annular groove 4, and a seal portion 6 is further provided on the inner side of the female screw 5, and O-rings 35 and 36 to be described later are disposed. A tapered step 44 is provided in the middle of the seal portion 6, and the step 44 prevents the O-ring 36 from being damaged.

  In the above configuration, the inner peripheral diameter of the seal portion 6 is smaller than the inner peripheral diameter of the female screw 5. As a result, the outer diameter (crest diameter) of the male screw 33, which will be described later, is larger than the inner peripheral diameter of the seal portion 6, so that the seal portion 6 is not damaged by the thread of the male screw 33. Further, the wall thickness of the end portion of the branch pipe 2 where the female screw 5 is installed by the annular groove 4 is thinner than the thickness of the seal portion, but the female screw 5 and the seal portion 6 are sequentially arranged from the end side of the branch pipe 2. By installing, the female screw 5 does not reach the fluid inside the main body 1. Therefore, the thickness of the portion where the female screw 5 is installed can be reduced to reduce the weight.

  Further, since the female screw 5 and the male screw 33 described later are parallel screws, there is no work for tightening with a predetermined torque like a conventional taper screw, and connection work can be performed without using a tool such as a spanner or a pipe wrench used for tightening. Can do. As the screw shapes of the female screw 5 and the male screw 33, a metric screw, a pipe parallel screw, a trapezoidal screw, a saw screw, or the like can be applied. In addition, if the distance moved in the axial direction when the screw rotates once is made 2 mm or more, more preferably 2 mm or more and 6 mm or less by using a trapezoidal screw or a multi-threaded screw structure, the number of rotations of the screw when attaching and detaching is reduced it can. Further, not only the screw structure but also a groove structure can be used.

  Generally, when a screw is rotated by hand or a tool, the screw can be rotated by about 90 to 270 ° by a single operation. When a person unaccustomed to the operation accidentally rotates the screw in the direction of loosening the screw, the movement distance in the axial direction of the male piping member 30 is larger than the axial width (the thickness of the O-rings 35 and 36) of the water stop member. If it is large, there is a possibility that the water stop member is detached from the seal portion 6 and the fluid inside the joint T1 leaks out. Therefore, it is preferable that the axial movement distance when the screw is rotated 90 to 270 ° is smaller than the axial width of the water stop member.

  Further, in the connecting portion 32 described later, a step is formed at a position corresponding to the step 44, and the O-ring installed in the connecting portion 32 in a state where the female screw 5 and the male screw 33 are screwed together as shown in FIG. A step provided between 35 and 36 is arranged close to the step 44 inside the branch pipe 2. Thereby, when the inside of the branch pipe 2 becomes negative pressure, the step of the connecting portion 32 is locked to the step 44, and the movement due to the negative pressure of the connecting portion 32 can be prevented.

  The male piping member 30 connected to the branch pipe 2 includes a male screw member 31 and a connecting portion 32. As shown in FIG. 5, the male screw member 31 has a hollow shape, and a male screw 33 that can be screwed with the female screw 5 is provided on one end side of the outer peripheral portion. The other end side is a gripping portion 38, and the outer peripheral cross-sectional shape is hexagonal or octagonal. A collar part 34 is installed between the male screw 33 and the gripping part 38, and the end surfaces of the collar parts 3, 34 come into contact with the male screw 33 and the female screw 5. The outer diameter of the collar part 34 is equal to the outer diameter of the collar part 3. Further, the outer diameter of the collar portion 34 is larger than the outer diameters of the male screw 33 and the grip portion 38. An end surface of the flange portion 34 on the side of the male screw 33 is a contact surface with the flange portion 3.

  A cylindrical connecting portion 32 is accommodated in the male screw member 31. Two O-rings 35 and 36 having different sizes are installed at the distal end of the connecting portion 32, and are arranged on the seal surface 6 by screwing of the male screw 33 and the female screw 5. Since the O-rings 35 and 36 are crushed by screwing, the frictional resistance is reduced as compared with the case where the connecting portion 32 is pushed straight into the seal surface 6 without a screw.

  Furthermore, since a plurality of O-rings 35 and 36 of different sizes are installed, the movement amount necessary for crushing the O-rings 35 and 36 is the movement amount of one O-ring, and the screw length of the male screw 33 Can be suppressed. In this embodiment, the O-rings 35 and 36 are installed in the male connecting portion 32, but one O-ring 35 and 36 can be installed on the seal surface 6 of the branch pipe 2 and the outer peripheral surface of the connecting portion 32 as shown in FIG. It is. In this way, the step 44 can be omitted. Further, in FIG. 8, in order to prevent the connection portion 32 from moving when the inside of the branch pipe 2 becomes negative pressure, a step 9 capable of locking the tip of the connection portion 32 is installed inside the branch pipe 2. ing. In the drawing, the step 9 is installed behind the seal surface 6.

  When the male pipe member 30 is removed from the branch pipe 2, the O-rings 35, 36 are separated from the seal surface 6 before the male screw 33 and the female screw 5 are unscrewed, and the internal fluid of the main body 1 escapes. It is possible to prevent the piping member 30 from evacuating vigorously due to the pressure of the internal fluid.

  The end on which the O-rings 35 and 36 are installed protrudes from the male screw member 31 and the opposite end is connected to the flexible pipe F. Since the connection part 37 with the flexible pipe F is housed inside the male screw member 31, it is protected from external force. Further, a gap is formed between the inner periphery of the male screw member 31 and the outer periphery of the flexible pipe F, and this is the movable range of the flexible pipe F. Therefore, even when an excessive load is applied to the flexible pipe F, the movable range is limited, and the connection portion 37 is prevented from being damaged.

  Further, the end of the male pipe member 30 on the side where the flexible pipe F is inserted serves as a contact surface that limits the movable range of the flexible pipe F. The length of the portion accommodated in the male pipe member 30 in the flexible pipe F is 0.5 to 3 times the outer diameter of the flexible pipe F, and is preferably 1 to 2 times. Thereby, excessive bending of the flexible piping F can be prevented while suppressing the length of the male piping member 30 and the connecting portion 32.

  The other end side of the connecting portion 32 is a flange 39a, and the flange 39a can be engaged with a step 39b formed inside the male screw member 31. The outer peripheral diameter of the flange 39 a is smaller than the inner peripheral diameter of the male pipe member 30 on the side where the flexible pipe F is inserted, and the connecting portion 32 can rotate freely with respect to the male pipe member 30. The step 39b is formed up to the end surface of the male piping member 22 on the male screw 21 side. The inner peripheral diameter of the step 39b is smaller than the inner peripheral diameter on the side where the flexible pipe F is inserted. Further, there is an appropriate gap between the inner periphery of the step 39b and the outer periphery of the connecting portion 32, and only one of the male pipe member 30 or the connecting portion 32 is configured to be rotatable around the central axis. .

  As shown in FIG. 5, when the male screw 33 and the female screw 5 are screwed together, a gap is provided between the flange 39a and the end surface of the step 39b. Even when the male screw 33 and the female screw 5 are screwed together by this gap, only the connecting portion 32 can be idled. More specifically, if the end surfaces of the flange 39a and the step 39b are in contact with each other and there is no gap, the contacted portion may become a resistance when the connecting portion 32 rotates, and the connecting portion 32 may be prevented from rotating. By providing the gap, the connecting portion 32 can be rotated smoothly.

  A retaining ring 39c is installed inside an annular groove carved on the outer periphery of the intermediate portion of the connecting portion 32, and the retaining ring 39c engages the tip of the male screw 33 of the male screw member 31. . With these structures, the connecting portion 32 is prevented from coming off from the male screw member 31, and the male screw member 31 is configured to be idle with respect to the connecting portion 32.

  A slope 39 d is provided on the inner periphery of the tip of the male screw 33 of the male piping member 30. The inclined surface 39d is a locking portion of the retaining ring 39c, and the inclined surface 39d is stopped when the connecting portion 32 is pressed toward the flexible piping F by the fluid pressure in the piping after the male screw 33 and the female screw 5 are connected. It has the effect | action which supports the ring | wheel 39c and presses to the central-axis side of the connection part 32. FIG.

  FIG. 5 shows a state in which the male screw 33 and the female screw 5 are screwed together. In this state, the indicator 40 can be engaged with the flange portions 3 and 34. The indicator 40 is provided with a ring 41 lacking a part of a ring, and a holding part 42 for pressing and holding the side surface 3a of the flange parts 3 and 34 is provided between the two rings 41 and 41.

  As shown in FIG. 6A, the inner edge of the ring 41 is U-shaped, the inner edges of the tips 43 of the ring 41 are formed substantially parallel, and the inner diameter of the ring 41 is the annular groove shown in FIG. The diameter d4 is 4 or more. By forming the tips 43 and 43 substantially parallel, the indicator 40 cannot be moored at a location where the outer diameter is smaller than the diameter d4 of the annular groove 4.

  The space | interval of the rings 41 and 41 is substantially the same as the thickness t when the opposing end surfaces of the collar parts 3 and 34 are contacting as shown in FIG. As a result, when the operator attaches the indicator 40 to the hooks 3 and 34 after the female screw 5 and the male screw 33 are screwed together, if the tip 43 of the ring 41 interferes with the hooks 3 and 34, the screw is fastened. Can be recognized as insufficient. On the other hand, when the indicator 40 is mounted at the position of the flanges 3 and 34 when the female screw 5 and the male screw 33 are in the fastened state, the tip 43 of the ring 41 is inserted into the annular groove 4 to avoid interference with the main body 1. . The tip 43 of the other ring 41 is inserted through the grip portion 38 along the side surface of the collar portion 34.

  The holding part 42 is provided with a holding part 42 a installed at the position farthest from the tip 43 of the ring 41 and two holding parts 42 b installed between the holding part 42 a and the tip 43. The holding part 42b is installed so as to face the side surface 3a of the flange parts 3 and 34. The front end 43 side of the holding portion 42 b is a flat surface 42 c that faces the front end 43. In FIG. 6A, the side surfaces 3a of the flange portions 3 and 34 indicated by two-dot chain lines are pressed and held by three holding portions (42a, 42b, and 42b). The end of the holding portion 42b on the distal end 43 side is slightly curved inward to prevent the collars 3 and 34 held inside the holding portion 42 from being detached. The rings 41 and 41 prevent the holding portion 42 from being displaced from the side surfaces of the flange portions 3 and 34 due to vibration or external force.

  The indicator 40 is configured to be connectable only to the flange portions 3 and 34, and a non-mounting portion of the indicator 40 is installed in the vicinity of the flange portions 3 and 34. More specifically, when the indicator 40 is attached to the gripping portion 38, the inner diameter of the ring 41 is larger than the outer diameter of the gripping portion 38 adjacent to the flange portion 34. Therefore, when the holding portion 42a is directed downward, the indicator 40 Cannot be attached to the grip portion 38. When the holding portion 42a is faced upward, the indicator 40 may be placed on the grip portion 38 and installed. However, since the indicator 40 falls off with a slight vibration, the indicator remains stable for a long time. 40 cannot be installed in the gripping part. Similarly, when the indicator 40 is placed on the flexible pipe F, the indicator 40 falls off without being stabilized.

  On the other hand, when the indicator 40 is to be mounted on the outer peripheral portion of the branch pipe 2, the protrusion 7 installed on the outer peripheral portion of the branch pipe 2 prevents the indicator 40 from being installed. More specifically, the protrusion 7 is disposed adjacent to the annular groove 4, and the outer diameter of the protrusion 7 is larger than the inner diameter of the ring 41. For this reason, if it is going to attach the indicator 40 to the protrusion part 7, the front-end | tip 43 of the ring 41 and the protrusion part 7 will interfere. Further, since the width of the protrusion 7 is wider than the distance between the pair of rings 41, 41, the protrusion 7 cannot be passed between the rings 41, 41.

  Further, a plurality of rib-shaped protrusions 8 are installed on the outer periphery of the branch pipe 2, and the protrusions 8 are installed in a straight line along the central axis (not shown) of the pipe line of the branch pipe 2. In FIG. 1, rib-shaped protrusions 8 are installed from the branch pipe 2 to the adjacent branch pipe 2. Similarly, a rib-like protrusion 8 is provided from the branch pipe 2 toward the upper end side of the main body 1. As shown in FIG. 3, the rib-like projecting portion 8 has a height that is in contact with the outer circumferential circle of the projecting portion 7, so that the tip 43 of the ring 41 is similar to the projecting portion 7. So that the indicator 40 cannot be mounted.

  As described above, the indicator 40 can be attached only to the positions of the collar portions 3 and 34 by the ring 41 and the holding portion 42 and can be attached when the collar portions 3 and 34 are in contact with each other. Therefore, it can be easily determined from a remote location that the female screw 5 and the male screw 33 are in a fastening state and the water-stopping member is acting on the seal surface.

  In addition, the indicator 40 has a function of maintaining the screwed state of the male screw 33 and the female screw 5 in a state where the indicator 40 is attached to the flange portions 3 and 34. More specifically, in order to remove the male screw 33 from the female screw 5, the male screw 33 must be rotated in a direction in which the collars 3 and 34 are separated. However, when the indicator 40 is attached to the collars 3 and 34, the collars 3 and 34 are sandwiched by the rings 41 and 41, so that the male screw 33 cannot be rotated and removed from the female screw 5. Accordingly, the indicator 40 prevents the male screw 33 and the female screw 5 from rotating in the direction in which they are removed.

Second Embodiment (FIGS. 8 to 9)
Next, a second embodiment of the present invention will be described. The adapter 51 used in the second embodiment shown in FIGS. 8 and 9 has a cylindrical shape, and has a screw structure 51 on one end side as a connection portion with the water supply pipe P of the fire extinguishing equipment. The internal structure of the other end side 52 is substantially the same as that of the branch pipe 2 of the first embodiment. In addition, the same code | symbol is attached | subjected to the location with the same structure as 1st Embodiment, and detailed description is abbreviate | omitted.

  The outer peripheral portion on the other end side of the adapter 50 has the same function as the above-described protrusion 7, and the outer diameter on the other end side is larger than the inner diameter of the ring 41, so the indicator 40 is attached to the other end side of the adapter 50. The structure is not possible. The flat surface 53 formed on the other end side 52 is used as a grip portion when the screw structure 51 is screwed into the water supply pipe P.

  The adapter 50 can implement | achieve the pipe joint which has a function similar to 1st Embodiment by connecting the screw structure 51 to the general branch joint used for fire extinguishing equipment piping. Moreover, the joint T2 can be installed in the water supply piping of the existing sprinkler equipment, and the flexible piping F provided with the male piping member 30 can be connected.

3rd Embodiment (FIGS. 10-12)
Next, a third embodiment of the present invention will be described. The firefighting equipment pipe joint T3 of the third embodiment shown in FIG. 10 has a Qi shape, and has a branch pipe 61 in the middle portion of the side surface of the cylindrical main body 60. Pipe screws 62 that can be connected to commercially available pipe joints, steel pipes, and the like are installed at both ends of the main body 60, and the internal structure of the branch pipe 61 is substantially the same as that of the branch pipe 2 of the first embodiment. In addition, the same code | symbol is attached | subjected to the location with the same structure as 1st Embodiment, and detailed description is abbreviate | omitted.

  Pipe screws 62 and 62 installed at both ends of the main body 60 are connected to the fire extinguishing equipment pipe P. The joint structure of the third embodiment can be used when the sprinkler head is installed in a portion where the protective section is narrow.

  Further, as a first modification of the joint structure of the third embodiment, a joint T31 shown in FIG. 11 has the same structure at both ends of the main body 60 as the branch pipe 2 of the first embodiment, and pipe screws 62 are installed on the branch pipe 61. It is also possible to configure.

In addition to this, in the joint T32 shown in FIG. 12 as the modified example 2, both ends of the main body 60 have the same configuration as that of the branch pipe 2 of the first embodiment, and the branch pipe 61 has the configuration of the male pipe connecting portion 30 described above. can do. By doing so, the branch pipe 2 can be added by connecting the male pipe connection part 30 of the joint T32 to one branch pipe 2 in the existing joint T1.

The present invention is not limited to the embodiment and the modification described above, and the branch pipe 2 and the pipe screw 62 can be separately installed at the lower end of the main body 1 in the joint T1 of the first embodiment. Further, the pipe end structures of various joints such as Qi and elbow can be configured by appropriately selecting the branch pipe 2, the male pipe joint portion 30, pipe screws, and the like.

T1 Firefighting equipment pipe fittings
1, 60 body
2 branch pipe
3, 34
4 annular groove
5 Female screw
30 Male piping connection
31 Male thread
32 connecting part
33 Male Screw
35, 36 O-ring
40 indicator
41 ring
42 (42a, 42b) holding part
43 Tip of the ring
50 adapter
F Flexible tube

Claims (18)

A main body that is cylindrical and has a connection portion with a fire extinguishing equipment pipe at the end,
A branch pipe installed on the side of the main body,
A female screw installed on the inner periphery of the end of the branch pipe;
It consists of a seal part arranged behind the female screw,
The inner diameter of the seal part is smaller than the inner diameter of the female screw,
A pipe joint for fire extinguishing equipment, characterized in that the thickness of the end of the branch pipe where the female screw is installed is thinner than the thickness of the part where the seal is installed. The pipe joint for fire extinguishing equipment according to claim 1, wherein the water stop member provided in the seal portion is annular, and the sizes of the plurality of water stop members installed are different from each other. The pipe joint for fire extinguishing equipment according to claim 2, wherein the seal portion is provided with a tapered step. The pipe joint for fire extinguishing equipment according to any one of claims 1 to 3, wherein the end face of the branch pipe is in contact with the contact face of the male pipe member when the water stop member acts on the sealing surface. The pipe joint for fire extinguishing equipment according to any one of claims 1 to 4, wherein an annular groove is provided on an outer periphery of a distal end portion of the branch pipe, and a female screw is installed inside the annular groove. The pipe joint for fire extinguishing equipment according to any one of claims 1 to 5, further comprising an indicator that is inserted into the annular groove after the male screw installed in the male piping member and the female screw are fastened. The pipe joint for fire extinguishing equipment according to any one of claims 1 to 6, wherein the branch pipe is installed in a radial direction from a side surface of the main body. The pipe joint for fire extinguishing equipment according to any one of claims 1 to 7, wherein an adapter having a structure of the branch pipe is connected to a pipe joint having a plurality of connection ports. The pipe joint for fire extinguishing equipment according to any one of claims 1 to 8, wherein the female screw and the male screw are parallel screws. The pipe joint for fire extinguishing equipment according to any one of claims 1 to 8, wherein the female screw and the male screw are tapered screws. The pipe joint for fire extinguishing equipment according to any one of claims 1 to 10, wherein the indicator prevents rotation in a direction in which the male screw and the female screw are removed. The collar part installed on the end face of the branch pipe and the collar part installed on the male pipe member are in contact with each other when the female screw and the male screw are in the threaded state. The pipe joint for fire extinguishing equipment according to any one of claims 1 to 11, wherein the indicator is pressed and held. A ring in which a part of the ring is missing is installed in the indicator, and the ring is inserted into the annular groove of the branch pipe along the side surface of the collar when attached to the collar. The pipe joint for fire extinguishing equipment according to claim 12. The pipe joint for fire extinguishing equipment according to any one of claims 1 to 13, wherein a step that can be engaged with the tip of the connecting portion is provided inside the branch pipe. The branch pipe structure according to claim 1 is provided at an end of a cylindrical main body, and the branch pipe installed on the side surface of the main body has a connection portion with a fire extinguishing equipment pipe. Pipe fittings. The pipe joint for fire extinguishing equipment according to claim 15, wherein the connection portion with the fire extinguishing equipment piping is a structure connectable to the branch pipe according to claim 1. The pipe joint for fire extinguishing equipment according to any one of claims 1 to 16, wherein the female screw and the male screw have a distance of 2 mm or more in the axial direction when the screw rotates once. The pipe joint for fire extinguishing equipment according to any one of claims 1 to 16, wherein an axial movement distance when the screw is rotated by 90 to 270 ° is smaller than an axial width of the water stop member.

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