JPH08135867A - Coupling for fluid piping - Google Patents

Abstract

PURPOSE: To provide a coupling for a fluid pipe which enables the installation and demounting between a male shaped coupling part and a female shaped coupling part in one-touch operation and realizes the sure lock. CONSTITUTION: When a joint pipe 43 is inserted into a fitting hole 7 and a projection member 45 is inserted inside from a hole opening groove part 11, one end part 41a of a body 41 makes contact with the cylindrical part 23b of a sleeve 23 having a collar at the initial position. When the joint pipe 43 is inserted furthermore, the projecting member 45 is introduced into an annular peripheral groove part 9. Since the sleeve 23 having the collar is shifted in this state to the innermost part from the initial position, an urging force is always applied to the joint pipe 43 from the sleeve 23 having the collar. When the projection member 45 reaches a recessed part 13 for engagement by turning a coupling plug rightward or leftward, the projection member 45 is naturally pushed into a recessed part 13 for engagement by the urging force, since the urging force is always applied to the joint pipe 43 from the sleeve 23 having the collar, and the joint state between the projection member 45 and the recessed part 13 for engagement is held.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a joint used for connecting fluid pipes.

[0002]

2. Description of the Related Art Conventionally, the problems to be solved by the invention
A screw type was used as a joint for fluid piping. In the case of this screw-in type, for example, a female joint structure formed with a tapered female screw and a male joint structure formed with a tapered male screw are connected by screwing, and the liquid is made by using packing or seal tape. Although it is used to prevent leakage, it requires a lot of construction man-hours and requires skill and experience because it uses a waterproofing method using packing and sealing tape. In this case, for example, if the screwing is inappropriate, water leakage may occur due to insufficient screwing, or damage may occur due to over-tightening and water leakage may occur due to this damage.

Therefore, the applicant of the present application filed Japanese Patent Application No. 3-100.
No. 154 (see Japanese Patent Laid-Open No. 4-331887) proposes a fluid pipe joint that can be connected with a small number of steps and does not cause connection failure or joint damage. The structure of this joint and its connecting method will be briefly described as follows. Insert the cylindrical joint pipe of the male joint portion into the cylindrical fitting hole provided in the main body of the female joint portion, and then insert the protruding member erected on the outer periphery of the joint pipe into the hole of the fitting hole. It is put into the annular peripheral groove formed in the inner circumference of the fitting hole through the hole mouth groove formed in the outer diameter direction from the mouth. In this state, if a screw is screwed into the screw hole formed in the hole groove portion from the outer periphery of the main body, the hole groove portion is closed by the screw, so that the protruding member is prevented from coming off via the hole groove portion. . Therefore, the connected state of the male joint structure and the female joint structure is maintained.

Further, Japanese Patent Laid-Open No. 4-331887 also discloses a locking recess formed in the hole circumferential direction from the annular peripheral groove portion. When the coupling pipe is rotated in the annular peripheral groove portion, The projection member falls into this concave portion to stop the rotation, and after the fluid is introduced into the concave portion, it is held by the hydraulic pressure.

However, considering the case where the sprinkler head is on the male joint side, for example, it is actually the case that the mating female joint portion has a little head protruding from the ceiling surface, etc. There is a lot of work involved when installing or removing the sprinkler head. In the case of the screw-in type described above, the sprinkler head is actually attached and removed by hooking and rotating the sprinkler head with a special tool.
The work is very troublesome. Particularly, in order to achieve a reliable lock by screwing, which is basically a frictional force, it is necessary to screw in firmly, so a considerable force is required even when removing. The same applies when a faucet is attached to a wall surface or the like.

Further, in the case of the joint of Japanese Patent Application Laid-Open No. 4-331887, since the basic mounting is not a type in which the basic mounting is realized by screwing, the above problem does not occur, but the protruding member passes through the hole groove portion. In order to prevent the screw from coming off, it is necessary to screw the screw. Considering that the female joint portion is often slightly protruding from the ceiling surface or the like as described above, further work can be expected without the work of screwing such screws. However, the reliable lock of both must be realized.

Therefore, the present invention solves the above-mentioned problems and allows a male joint portion and a female joint portion to be attached / detached with a single touch even with a simple structure, and yet a fluid pipe for realizing a reliable lock is realized. The purpose is to provide a joint.

[0008]

In order to achieve the above object, the invention according to claim 1 has a substantially cylindrical shape having a cylindrical fitting hole axially formed inside one end thereof. A fitting for a fluid pipe constituted by fitting a cylindrical coupling pipe of a male coupling portion into the fitting hole of the female coupling portion, wherein the male coupling portion is provided on the outer periphery of the coupling pipe. On the other hand, the projecting member is provided upright, while the female joint portion is formed in an outer circumferential direction from an annular peripheral groove portion formed in the inner periphery of the fitting hole and a hole opening of the fitting hole. Together with the hole mouth groove portion communicating with the peripheral groove portion, the locking recess formed from the annular peripheral groove portion in the hole mouth direction, the coupling pipe fitted in the fitting hole in the hole mouth direction. It is urged to move the projecting member provided on the coupling pipe to a position in the annular circumferential groove that coincides with the engaging recess. The when is the joint fluid piping, characterized in that a pressing capable biasing mechanism that protrusion member in the locking recess.

According to a second aspect of the present invention, in the urging mechanism, the urging member that abuts on the coupling pipe of the male joint portion is moved inward from the initial position by the coupling pipe. It is configured to generate a biasing force,
2. The fluid according to claim 1, wherein the projecting member of the coupling pipe that is in contact with the biasing member at the initial position is displaced from the annular circumferential groove portion toward the hole mouth side. It is a pipe joint.

According to a third aspect of the present invention, the projecting members of the male joint portion are provided in pairs on the outer circumference of the coupling pipe so as to be axially symmetrical, while on the other hand, the female joint portion is provided with the pair of projecting members. 3. The fluid pipe joint according to claim 1 or 2, wherein at least one set of the hole mouth groove portion and the locking concave portion is also provided on the axis.

According to a fourth aspect of the invention, a plurality of the locking recesses of the female joint portion are provided in the annular groove portion at predetermined angular intervals, and the fluid according to the first or second aspect of the invention. It is a joint for piping.

[0012]

According to the first aspect of the present invention having the above-described structure, the fluid pipe is formed by fitting the cylindrical coupling pipe of the male joint portion into the cylindrical fitting hole of the female joint portion. The joint will be described below. The operation will be described according to the procedure for first attaching both. First, the protruding member on the outer periphery of the coupling pipe is put into the annular peripheral groove portion via the hole / groove portion of the female joint portion. Next, when the male joint portion is rotated and the protruding member is moved within the annular circumferential groove portion to a position that coincides with the locking recess, the protruding member is pressed by the biasing mechanism into the locking recess. Therefore, the projecting member and the locking recess are engaged with each other so that they are not separated from each other.

When both are to be removed, first, the protrusion member pressed by the biasing mechanism into the locking recess is
The coupling pipe is rotated in a state of returning to the annular circumferential groove portion against the biasing force. Then, the projecting member is moved to a position that coincides with the hole mouth groove portion, and is removed from the annular circumferential groove portion to the outside via the hole mouth groove portion.

As described above, the projection member is engaged with the locking recess by the biasing mechanism only by rotating the projection member in the annular circumferential groove until it coincides with the locking recess. Therefore, the structure is simple. However, the male joint and female joint can be attached with one touch. Further, since the projecting member is pressed against the locking recess by the biasing mechanism, it can be securely locked. Further, the protrusion member can be removed with one touch by rotating the protrusion member in a state of returning to the annular peripheral groove portion against the biasing force of the biasing mechanism and pulling it out of the hole groove portion.

Since both attachment and detachment can be realized with one touch as described above, the work precision does not deteriorate even by an unskilled worker. Further, since separate parts such as screws are not necessary, the parts are not lost, and the screw itself is screwed in, so that the work itself and the working space therefor are unnecessary. Therefore, even when there is little work space in the surroundings or in a place where the surroundings are dark, it is only necessary to move the projecting member along a predetermined path, and therefore work can be performed easily.

As the urging mechanism, the urging member is brought into contact with the coupling pipe of the male joint portion, and the urging force is generated by moving the coupling member from the initial position to the inner side by the coupling pipe. It is preferable that the projecting member of the coupling tube that is configured as described above and that is in contact with the biasing member at the initial position is displaced from the annular peripheral groove portion toward the hole opening side.

In this case, when the projection member is inserted into the annular groove portion from the hole groove portion, the biasing member is moved inward from the initial position. Therefore, when the protrusion member is moved in the annular peripheral groove portion, since the biasing member always biases the coupling pipe, if the protrusion member is moved to a position that coincides with the locking recess, The projecting member is naturally pushed into the locking recess by the biasing force from the biasing member. In other words, it is not necessary for the operator to check the position where the projecting member coincides with the locking recess each time, and the male member is pushed slightly into the locking recess so that the male joint part itself is slightly front side. It is pushed back to, and you can hear the sound of contact between them.

As described above, since the completion state of the lock can be surely confirmed by the texture and the sound, it is preferable in that the working accuracy is prevented from being lowered even by the above-mentioned unskilled worker. Further, even when detaching, when the protrusion member is rotated in the annular circumferential groove portion and moved until it coincides with the hole groove portion, the biasing mechanism tries to return the biasing member to the initial position. The male joint portion is biased in the direction in which the male joint portion is going to come out from the groove portion. for that reason,
When the force applied to the male joint portion is released, the male joint portion naturally separates from the female joint portion. This is because it is not easy to pull the male joint part in the past, even if the lock is released, especially when the female joint part has a little head protruding from the ceiling surface or wall surface in the actual construction situation. However, if the male joint part is naturally separated as in the case of the present invention, the dismounting work itself will be easy and the work efficiency will be improved.

On the other hand, according to a third aspect of the invention, two sets of projecting members of the male joint portion are provided as a set for the shaft, and the hole groove portion and the locking recess of the female joint portion are also provided as a set for the shaft. There are more than one set. The installation / removal method is the above-mentioned claim 1.
Although it is similar to the one described above, the protrusion member is provided on the axis so that it is preferable in terms of achieving a reliable lock. Can be engaged with the recess.

For example, the projection member, the hole mouth groove portion, and the engaging recess portion are all one, and, for example, the hole mouth groove portion and the engaging recess portion are nine.
In the case of arranging them at intervals of 0 degree, for example, in the left rotation, when they are rotated by 90 degrees, they coincide with the locking recesses, but when they are rotated in the right direction, they are rotated by 270 degrees. Of course, it may be finally engaged, but as an example of claim 3, for example, the hole mouth groove portion and the locking concave portion are symmetrical with respect to each other.
If two units are provided at an interval of two degrees, they can be engaged by rotating 90 degrees on either side, and when disengaged, the projecting member will come to the position of the hole groove section if rotated by 90 degrees on either side. good.

It is also possible to consider an application example in which one hole groove portion is provided and two or more locking concave portions are provided.
Two or more sets of hole mouth groove portions may be provided. To put it further,
For example, the projection member, the hole groove portion, and the locking recess are all 120
Various modifications are possible such as providing three at intervals of four or four at 90 degrees. In any case,
It is sufficient that the protruding members can be inserted into the annular groove portion from the hole groove portion, and that all the protruding members can be simultaneously engaged with the locking recesses when rotated by a predetermined angle so as to satisfy the positional relationship.

On the other hand, according to the fourth aspect of the present invention, a plurality of locking recesses are provided in the annular groove portion at a predetermined angular interval. This is, for example, when the positioning of the male joint portion needs to be adjusted. It is valid. That is, when it is desired to adjust the mounting angle of the male joint portion, which is normally exposed to the outside, it can be dealt with by changing the engaging recess for engagement to an optimum one.

[0023]

EXAMPLE An example of a joint for fluid piping according to the present invention will be described below. FIG. 1 shows a partially broken perspective view of a joint body 1 as an example of a female joint portion and a joint plug 3 as an example of a male joint portion. 2 is a partial cross-sectional view of the joint body 1 and the joint plug 3 as viewed from the front, FIG. 3A is a right and left side view of the joint body 1, and FIG. 3B is a right side view of the joint plug.

First, the joint body 1 will be described. The joint body 1 includes a main body 5, a cylindrical fitting hole 7, an annular peripheral groove portion 9, a hole mouth groove portion 11, a first locking concave portion 13, and a second
Locking recess 15, O-ring housing groove 17, and O-ring 1
9, a main body collar portion 21, a collar sleeve 23 as an urging member, a coil spring 25, and a fixing bush 27.
And a parallel female screw portion 29 and a tapered female screw portion 31.

The main body 5 is a metal member having a cylindrical outer periphery, and the cylindrical fitting hole 7 is formed from one end 5a to the other end 5b of the main body 5. The annular peripheral groove portion 9 is
It is formed at a position a predetermined distance from the one end 5a.
The hole mouth groove portion 11 is formed in the outer diameter direction from the shaft center at the one end portion 5 a and communicates with the annular peripheral groove portion 9.

The first locking recess 13 is a round hole formed so as to penetrate from the outer circumference to the inner circumference of the main body 5.
The first locking recess 13 is formed on one edge 9 of the annular circumferential groove 9.
It is opened around b. That is, the annular circumferential groove portion 9
Is formed at a position closer to the one end portion 5a (shifted by half). Further, the second locking recess 15 is the first locking recess 1
It is formed so as to be axisymmetric with respect to 3.

The O-ring accommodating groove 17 is formed at a position deeper than the annular peripheral groove 9 (on the other end 5b side), and the O-ring accommodating groove 17 has an O-ring 19 therein. . The main body flange 21 is formed at a position further inside the O-ring housing groove 17 by a predetermined distance (on the other end 5b side). The main body collar 21 has a collar sleeve 23.
Of the cylindrical portion 2 of the collared sleeve 23 by engaging the collar portion 23a of the
3b is arranged so as to face the one end 5a side.

The fixing bush 27 is screwed and fixed to a parallel female screw portion 29 provided on the other end portion 5b side of the main body collar portion 21, and the fixing bush 27 and the collar sleeve 23 are connected to each other. A coil spring 25 is contracted and interposed between the two. The urging force from the coil spring 25 causes the collar sleeve 23 to move to the collar portion 23.
The state where a is in contact with the main body flange portion 21 is set as the initial position so that it can be moved a predetermined distance on the other end portion 5b side.

Further, as shown in FIG. 2, the tapered female screw portion 31 is formed from the other end portion 5b of the main body 5 to just before the parallel female screw portion 29. Then, the fluid supply pipe 33 and the like are screwed into the tapered female screw portion 31. Next, the joint plug 3 will be described. The joint plug 3 includes a main body 41, a collar portion 42, a coupling pipe 43, and a protruding member 45.
And a flow path 47. The flange 42 is provided near the center of the main body 41, and the coupling pipe 43 is formed from one end 41 a of the main body 41 to the flange 42. Coupling pipe 4
3 has a cylindrical shape and is provided with an insertion hole 43a for the projection member 45.

The protruding member 45 has a cylindrical shape and is inserted and fixed in the insertion hole 43a. Next, joint body 1
The procedure for connecting the connector and the joint plug 3 will be described with reference to FIGS. First, the one end 41 a of the coupling pipe 43 is inserted from the one end 5 a side of the fitting hole 7. Next, when the projecting member 45 is inserted into the inside of the hole groove portion 11, before the projecting member 45 enters the annular circumferential groove portion 9, the tip of the coupling pipe 43, that is, the main body 4 is inserted.
One end portion 41a of No. 1 abuts on the tip of the cylindrical portion 23b of the collared sleeve 23 at the initial position. This state is shown in FIG.

Then, when the coupling pipe 43 is further inserted, the protruding member 45 enters the annular circumferential groove portion 9 as shown in FIG. In this state, the connecting pipe 43 reaches the O-ring 19, and a liquid leakage preventing seal between the joint body 1 and the joint plug 3 is formed. In addition, the coupling pipe 43 moves the collared sleeve 23 from the initial position to the inner side (that is, the collar portion 23a of the collared sleeve 23 moves away from the main body collar portion 21 provided on the inner periphery of the fitting hole 7). , Coil spring 2
5 is further contracted to connect the collar sleeve 23 to the connecting pipe 4
Bias is always added to 3.

Next, the joint plug 3 is rotated right or left. As a result, the protruding member 45 moves away from the hole groove portion 11 and enters the annular circumferential groove portion 9. After that, fitting plug 3
When the projection member 45 reaches the first locking recess 13 or the second locking recess 15 by continuing to rotate, the urging force is always applied from the collar sleeve 23 to the coupling pipe 43 as described above. Therefore, the projecting member 45 is naturally pushed into the locking recesses 13 and 15 by the biasing force and is pressed against the wall surface thereof. In this way, the engagement state between the projecting member 45 and the locking recesses 13 and 15 is maintained.

According to the procedure described above, the joint body 1
And the connection plug 3 are connected with one touch, and the locked state is maintained. Next, the procedure for removing the both will be described. First, the protrusion member 45 is pressed against the locking recesses 13 and 15 by the collared sleeve 23.
Is returned to the annular circumferential groove portion 9 against the urging force, and the joint plug 3 is rotated. Then, the protruding member 45
Is moved to a position that coincides with the hole groove portion 11, the urging force of the coil spring 25 causes the collared sleeve 2 to move.
Since 3 tries to return to the initial position, the projecting member 45 pushes the coupling pipe 43 in a direction in which the projecting member 45 tries to come out from the hole groove portion 11.

Therefore, when the worker removes the force applied to the joint plug 3, the worker naturally separates from the joint body 1.
In this way, when the protruding member 45 is pulled out from the hole groove portion 11, the removal is completed. The effects of the joint of the fluid pipe of the present embodiment, which has the configuration described above and can be attached / detached according to the above procedure, will be listed. Since it can be installed and removed with one touch,
There is no need for advanced technology or years of experience, and the work accuracy does not deteriorate even for unskilled workers. Further, since separate parts such as screws are not necessary, the parts are not lost, and the screw itself is screwed in, so that the work itself and the working space therefor are unnecessary. Therefore, even when there is little work space in the surroundings or in a place where the surroundings are dark, it is only necessary to move the projecting member 45 according to a predetermined route, and thus work can be performed easily. Even if the operator does not know the positions of the locking recesses 13 and 15, that is, how much the joint plug 3 should be rotated to bring the locking state into the locked state, the protruding member 45 naturally causes the locking recesses 13. By being pushed into 15,
Since the joint plug 3 itself is pushed back slightly to the front side, and a sound of contact between them (for example, a metal contact sound such as "chacha" because it is made of metal) is heard,
It can be easily determined that the locked state is completed. In this way, the completion state of the lock can be surely determined by the texture and the sound, so that even an unskilled worker does not deteriorate the working accuracy. At the time of removal, when the projecting member 45 is moved to a position that coincides with the hole groove portion 11 and the worker removes the force applied to the joint plug 3, the worker naturally separates from the joint body 1. This is often the case when the joint body 1 is slightly protruding from the ceiling surface, wall surface, or the like indicated by the two-dot chain line in FIGS. In such a case, conventionally, it was not easy to pull the joint plug 3 itself even if the lock was released, but if the joint plug 3 is naturally pushed out as in this embodiment, it can be removed. The work itself becomes easier and the work efficiency also improves.

The present invention is not limited to the above embodiments, and various embodiments can be carried out without changing the gist of the present invention. Some of the other embodiments will be described with reference to FIG. Joint body 101 shown in FIG. 7 (A)
Is used as a set with the joint plug 103 shown in (B), and the joint plug 103 is provided with two projecting members 45 and 46 as a set on the axis. Further, the joint body 101 is provided with one pair of hole mouth groove portions 11 and 12 and locking recess portions 13 and 15, respectively, which are axially symmetrical. The method of attachment / detachment is the same as that of the above-mentioned embodiment, but since the projection members 45 and 46 are provided on the shafts, it is preferable in terms of realizing reliable locking. In addition, the left and right sides are engaged by rotating 90 degrees, and the left and right sides are engaged by rotating by 90 degrees, so that the protruding member comes to the position of the hole groove portion, which is convenient.

That is, in the case of the embodiment of FIG. 1 described above, for example, when it is rotated to the left and engaged with the second locking recess 15, it is necessary to rotate it by 90 degrees by rotating it clockwise when removing it. Good, but if you rotate it to the left, you need to rotate it by 270 degrees. Then, since it engages with the first locking recess 13 once in the middle of the process, it is a work of further releasing the engagement and then rotating it further by 90 degrees. Of course, the effect that it can be removed with one touch still does not change, but it is preferable from the viewpoint of usability that it can be locked by rotating it 90 degrees on either side, and it can be rotated 90 degrees on either side when removing it. I can say.

Incidentally, in FIG. 7 (A), the hole mouth groove portion 1
An application example in which 1 and 12 are one set and two or three or more locking recesses are provided is also conceivable, and two or more sets of hole groove portions may be provided. Further speaking, for example, a protruding member,
Various modifications can be considered, such as providing three hole mouth grooves and three locking recesses at 120-degree intervals, or four at 90-degree intervals. In any case, the projection members can be inserted into the annular peripheral groove portion from the hole opening groove portion, and if the rotation is performed by a predetermined angle, all the projection members should be in such a position that all the projection members are simultaneously engaged with the locking concave portion. Good.

On the other hand, the joint body 111 shown in FIG.
In the annular groove 9, seven locking recesses 51 to 57 are provided at a predetermined angle (in this case, 45 degrees).
This is effective when positioning adjustment is required on the joint plug side. That is, when it is desired to adjust the attachment angle of the joint plug, which is a portion that is normally exposed to the outside, if the engaging recesses 51 to 57 to be engaged are changed to optimal ones, this can be handled at 45 degree intervals.

Further, supplementary description will be made of the recesses 13 and 15 for locking. In the embodiment shown in FIG. 1, the projection member 45 having a cylindrical shape is formed in a semi-cylindrical recess so that only half of the protruding member 45 is fitted. Was there. This is because the projecting member 45 causes the locking recesses 13, 1 even when a force is applied to rotate the coupling pipe 43.
At least half of the protruding member 45 is adapted to engage with the locking recesses 13 and 15 so as not to come off from 5.
Therefore, as shown in FIG. 7 (D), the projection member 45 may be set to a depth such that the projection member 45 is entirely engaged with the snap ring. preferable.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a joint body 1 and a joint plug 3.

FIG. 2 is a partial cross-sectional view of the joint body 1 and the joint plug 3 as viewed from the front.

3A is a right and left side view of the joint body 1, and FIG. 3B is a right side view of the joint plug.

FIG. 4 is an explanatory diagram of a connection procedure between the joint plug 3 and the joint body 1.

FIG. 5 is an explanatory diagram of a connection procedure between the joint plug 3 and the joint body 1.

FIG. 6 is an explanatory diagram of a connection procedure between the joint plug 3 and the joint body 1.

FIG. 7 is an explanatory diagram showing another embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Joint body 3 ... Joint plug 5 ... Main body 5a ... One end 5b ... The other end 7 ... Fitting hole 9 ... Annular peripheral groove 11 ... Hole slot groove 13 ... First locking recess 15 ... Second locking Recessed portion 17 ... O-ring storage groove 19 ... O-ring 21 ... Main body flange portion 23 ... Collar sleeve 23a ... Collar portion 23b ... Cylindrical portion 25 ... Coil spring 27 ... Fixing bush 41 ... Main body 41a ... One end portion 42 ... Collar portion 43 ... Coupling pipe 45 ... Projection members 51-57 ... Recessing recess

Claims (4)

[Claims] 1. A cylindrical coupling pipe of a male joint portion is fitted in the fitting hole of a substantially cylindrical female joint portion having a cylindrical fitting hole formed in one end portion in the axial direction. Is a fitting for a fluid pipe configured by fitting, wherein the male joint portion includes a protruding member that is provided upright on the outer circumference of the coupling pipe, while the female joint portion is the fitting member. An annular peripheral groove portion formed on the inner periphery of the hole, a hole mouth groove portion formed in the outer diameter direction from the hole mouth of the fitting hole and communicating with the peripheral groove portion, and the annular peripheral groove portion to the hole mouth Direction, and the coupling recess fitted in the fitting hole is urged toward the hole opening direction, and the projection member provided in the coupling pipe is provided in the annular peripheral groove portion. An urging mechanism capable of pressing the projecting member to the locking recess when it is moved to a position that coincides with the locking recess. Joint fluid piping, characterized in that there was e. 2. The urging mechanism is configured to generate an urging force by moving an urging member, which comes into contact with the connecting pipe of the male joint portion, from the initial position to the inner side by the connecting pipe. 2. The projection member of the coupling pipe, which is in contact with the biasing member at the initial position, is arranged so as to be displaced toward the hole mouth side from the annular peripheral groove portion. Fluid piping joints. 3. The projecting members of the male joint portion are provided as a set of two in axial symmetry on the outer periphery of the coupling pipe, while the projecting members of the female joint portion and the hole mouth groove portion and the engaging portion are provided. The fitting for a fluid pipe according to claim 1 or 2, wherein at least one set of recesses for stopping is also provided on the axis. 4. The locking recess of the female joint portion,
A plurality of fluid pipe joints according to claim 1 or 2, wherein a plurality of them are provided in the annular groove portion at predetermined angular intervals.