JPH0439507Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention connects two pipes, such as water pipes and gas pipes, which are plug-connected, using a plurality of bolts arranged in parallel in the circumferential direction of the pipes to prevent them from coming out. In this case, regarding the structure of the connecting part for forming the hook part of the bolt on the pipe,
More specifically, a connecting ring for connecting to another pipe to be connected to the pipe is fitted onto the outside of the pipe, and recesses are formed on the inner periphery of each of the connecting rings at a plurality of locations spaced apart in the circumferential direction. and each of the recesses holds a ring fixing member that can be pressed and fixed to the outer peripheral surface of the tube,
In order to press and operate the ring fixing member against the outer peripheral surface of the pipe through a pressing tapered surface of the connecting ring that is inclined toward the outer peripheral surface of the pipe as the distance from the connecting end of the pipe with another pipe increases. A push bolt is screwed onto the connecting end side of the ring fixing member, and a latching cutting edge that bites into the outer peripheral surface of the pipe when pressed by the push bolt is attached to the connecting end side of the ring fixing member. By forming the ring over a length larger than the area where the pressing force is applied, it is possible to securely fix the connecting ring by biting the latching cutting edge, and the ring fixing member is attached to the connecting ring. A holding piece for holding the ring fixing member is interposed between the end surface of the ring fixing member opposite to the cutting edge forming part and the inner surface of the recess facing the end surface,
The present invention relates to a structure for connecting a pipe, which allows a connecting ring to be externally fitted onto a pipe with good workability by preventing a ring fixing member from falling off the connecting ring.

[Conventional technology]

Conventionally, as shown in FIG. 7, as the above-mentioned pipe connection structure, a holding piece 8' is connected to a ring fixing member 6' on the back of a location E' where pressing force is applied by a push bolt 7' and a connecting ring. 4' is known (I can't list any references).

[The problem that the idea aims to solve]

However, the conventional pipe connection structure described above has the following problems.

In other words, the holding piece is attached to the back part of the ring fixing member.
Since it was interposed between the ring fixing member and the connecting ring at certain points, it was difficult to maintain a stable posture of the ring fixing member. Therefore, if the ring fixing member rotates about the contact point of the holding piece as a fulcrum due to the rotational force generated by pressing with the push bolt, or if it shifts in the circumferential direction of the pipe, the pipe connection state The pressing tapered surface that receives the pulling force generated due to the fluid conveyance in the pipe and converts the pulling force into a pressing force against the ring fixing member toward the outer peripheral surface of the pipe is biased from the contact point of the holding piece. , the connecting ring may rotate about the contact point as a fulcrum, and as a result, there is a risk that the connecting ring may not be securely fixed to the pipe by the hooking cutting edge of the ring fixing member.

In addition, the pulling force generated during fluid transport as mentioned above can be reduced by
In order to reliably change the pressing force against the ring fixing member toward the outer circumferential surface of the pipe by contact with the push bolt, it is necessary to increase the longitudinal dimension of the pipe at the location where the push bolt applies the pushing force on the ring fixing member. In the case of the conventional structure in which the holding piece was interposed at the back of the area where the holding piece acts, the portion of the connecting ring against which the holding piece comes into contact is opposed to the pulling force. In addition to the fact that it needs to be formed as thick as possible, the above-mentioned ring fixing member, the holding piece, and the thick part of the connecting ring overlap, so the connecting ring becomes thick. However, there were also problems in that handling was troublesome and workability was poor.

In view of the above-mentioned circumstances, an object of the present invention is to provide a pipe connecting portion structure in which the connecting ring can be securely fixed to the pipe and the connecting ring can be easily handled.

[Means to solve the problem]

The characteristic structure of the pipe connecting part structure according to the present invention is that the end surface of the ring fixing member that can be pressed and fixed to the outer circumferential surface of the tube, on the opposite side from the cutting edge forming part, is pressed against the outer circumferential surface of the tube. A tapered surface is formed on both sides of the application point of the pressing force by the push bolt for actuation, and the ring fixing member is formed on the connecting ring, and the ring fixing member is formed on the connecting ring. While the holding piece for holding is in contact with each of the tapered surfaces, the end face and the inner surface of the recess formed at each of the inner periphery at a plurality of locations spaced apart in the circumferential direction of the connecting ring. The reason is that it is interposed between the end surface and the opposite surface.

[Effect]

In other words, in the ring fixing member, the part where the pressing force is applied by the push bolt needs to be formed with a large dimension in the longitudinal direction of the tube, as described above, but the other parts need to be formed with a large dimension. By forming the end face of that part into a tapered surface, we focused on the fact that there is no need for it, and by forming the end face of that part into a tapered surface, we can insert a holding piece between the tapered surface and the connecting ring, while still maintaining the longitudinal length of the pipe in the recessed part of the connecting ring. An increase in dimension in the direction can be avoided. In addition, this and the fact that the parts of the connecting ring that the holding piece comes into contact with do not have to be very thick on both sides of the area where the pressing force of the push bolt is applied make it possible to reduce the thickness of the connecting ring. The overall thickness can be reduced.

Then, the tapered surface of the end face of the ring fixing member is
Since the ring fixing member is formed on both sides of the location where the pressing force is applied by the push bolt, the holding pieces that come into contact with each of the tapered surfaces can hold the ring fixing member at two different locations in the circumferential direction of the tube from the locations where the pressing force is applied. Therefore, the rotation of the ring fixing member can be restricted and its posture can be stabilized.

Furthermore, the pair of tapered surfaces of the holding piece are formed so that the further away from the action point of the push bolt in the circumferential direction of the tube, the closer they approach the cutting edge forming portion on the opposite side of the end surface. The component forces in the tube circumferential direction of the holding force against the ring fixing member due to contact with the tapered surface of the ring are directed toward the location where the pressing force by the push bolt is applied, and the pair of centripetal component forces Therefore, movement of the ring fixing member in the tube circumferential direction is restricted, and positional displacement can be prevented.

[Effects of the invention] As a result, the thickness of the connecting ring is made thinner, making it easier to handle, while restricting the rotation and movement of the ring fixing member in the pipe circumferential direction. Regardless of the rotational force associated with pressing or the pulling force applied during fluid transfer, the ring fixing member is maintained in an accurate position and posture, and all of its long latching cutting edges are By reliably biting into the outer circumferential surface, the connecting ring can be securely fixed to the pipe, and overall, the connecting ring can be attached to the pipe with good workability, and the connecting ring can be attached to the pipe easily. It has a pipe joint structure that can be securely fixed to the pipe.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

As shown in FIG. 3 and FIG.
The connecting ring 4 is fitted onto the plug-in pipe 2 in a fixed position, and the flange 1a of the socket pipe 1 is connected to the plug-in pipe 2.
and the connecting ring 4 of the plug-in pipe 2 are connected with a plurality of bolts 5 having T-shaped heads, thereby connecting the socket pipe 1 and the plug-in pipe 2 in a state where they are prevented from coming out. It is configured.

As shown in FIGS. 1 to 4, the fixing structure of the connecting ring 4 on the insertion pipe 2 side includes recesses 4a on the inner periphery of each of the connecting rings 4 at a plurality of locations spaced apart from each other in the circumferential direction. A ring fixing member 6, which can be pressed and fixed to the outer circumferential surface of the insertion tube 2, is held in each of the recesses 4a with its position regulated in the tube circumferential direction. A push bolt 7 for pressing and operating the fixing member 6 is screwed into the fixing member 6.

The ring fixing member 6 has, on its socket pipe 1 side,
The latching cutting edge 6a, which bites into the outer circumferential surface of the insertion tube 2 when pressed by the push bolt 7, is made to have a length larger than the area E where the pressing force by the push bolt 7 is applied in the circumferential direction of the insertion tube 2. It is formed across the board. Further, an auxiliary cutting edge 6b is formed on the opposite side of the forming portion of the cutting edge 6a. The contact surface 6A of this ring fixing member 6 with the push bolt 7 is as follows:
Each of them is formed into a pressing tapered surface t in an inclined position that approaches the outer circumferential surface of the insertion tube 2 as the distance from the socket tube 1 increases.

In other words, when the plug-in pipe 2 is connected to the socket pipe 1, the pulling force generated when fluid is transported inside both pipes 1 and 2 acts on the plug-in pipe 2, causing the plug-in pipe to 2, the ring fixing member 6 moves together with the pressing tapered surface t and the push bolt 7, which applies a pressing force to the ring fixing member 6 toward the outer peripheral surface of the insertion tube 2. The latching cutting edge 6a and the auxiliary cutting edge 6b can be caused to bite into the outer circumferential surface of the insertion tube 2.

Further, as shown in FIG. 2B, the connecting ring 4
A holding piece 8 for holding the ring fixing member 6 is attached to the end surface 6X of the ring fixing member 6 on the opposite side from the cutting edge 6a forming part and to the end surface 6X of the inner surface of the recess 4a of the connecting ring 4. It is interposed between the opposing inner surface 4b. In other words, the above-described configuration prevents the ring fixing member 6 from falling out of the recesses 4a formed in a large number in the circumferential direction of the connecting ring 4, so that the connecting ring 4 can be attached to the insertion tube 2. The work of fitting externally,
The ring fixing member 6 is positioned close to the socket pipe 1 within the recess 4a of the connecting ring 4 so as to be able to do it skillfully and easily.

As shown in FIG. 1, the intervening structure of the holding piece 8 is such that the end face 6X of the ring fixing member 6 on the opposite side from the cutting edge 6a forming portion is located on both sides of the location E where the pressing force is applied by the push bolt 7. The tapered surfaces 6 get closer to the cutting edge 6a forming portion as the distance from the action point E along the circumferential direction of the insertion tube 2 increases.
B, 6C, and a pair of holding pieces 8A, 8B
are interposed in contact with each of the tapered surfaces 6B and 6C, respectively.

In other words, the parts on both sides of the point E where the pushing force is applied by the push bolt 7 are not as strong as the point E where the above-mentioned pulling force is applied to the outer peripheral surface of the tube of the ring fixing member 6. Since it is not necessary to increase the longitudinal dimension of 2, the end surface 6X on the opposite side from the part where the cutting edge 6a is formed is formed into a tapered surface 6B,
6C, the tapered surfaces 6B, 6
Although the holding piece 8 is interposed between C and the connecting ring 4, the recess 4a of the connecting ring 4 can be made smaller in the longitudinal direction of the insertion tube 2, and in addition, the holding piece 8 Since the portion of the connecting ring 4 that receives the ring does not need to be very thick, the connecting ring 4 as a whole is made thin so that it can be easily handled.

Further, the ring fixing member 6 is attached to a pair of holding pieces 8A, 8 at two different locations in the circumferential direction of the insertion tube 2 from the location E where the pressing force is applied by the push bolt 7.
By holding the ring fixing member 6 at B, the posture of the ring fixing member 6 is stabilized, and the rotation of the ring fixing member 6 due to the rotational force caused by the pressing operation by the push bolt 7 is prevented, and the ring fixing member 6 is prevented from rotating. The connecting ring 4 is reliably fixed to the insertion tube 2 by biting the locking cutting edge 6a into the outer circumferential wall of the insertion tube 2.

Furthermore, since the pair of tapered surfaces 6B and 6C that the pair of holding pieces 8A and 8B abut are tilted in opposite directions, the ring fixing member 6
is held in a state where there is no positional deviation in the circumferential direction of the insertion tube 2, and the posture of the ring fixing member 6 is prevented from being disturbed due to the above-mentioned pulling force being transmitted unevenly to the ring fixing member 6. , so that it is possible to avoid uncertain fixing of the connecting ring 4 to the insertion tube 2.

[Another example]

Next, another embodiment of the present invention will be listed.

<1> In the previous embodiment, the pair of holding pieces 8
A and 8B have been described as being interposed in a state in which they are respectively in contact with the pair of tapered surfaces 6B and 6C of the ring fixing member 6, but instead of that, as shown in FIG. The ring fixing member 6 may be configured as an integral member having tapered surfaces 8a and 8b corresponding to the pair of tapered surfaces 6B and 6C.

<2> As in the previous embodiment, when the ring fixing member 6 is held by a pair of holding pieces 8A, 8B, the pair of holding pieces 8A, 8B may be connected to each other with a string, chain, etc. For example, it is useful because it can prevent the holding pieces 8A, 8B from dissipating during intervening work.

<3> In the previous embodiment, the structure in which the push bolt 7 was brought into direct contact with the ring fixing member 6 was explained, but
In carrying out the present invention, a pressing member 9 may be interposed between the pressing bolt 7 and the ring fixing member 6, as shown in FIG. In that case, even if the pressing tapered surface t is formed on the upper surface 6A of the ring fixing member 6 and the lower surface 9A of the pressing member 9 as shown in the figure, only one of the pressing tapered surfaces t is formed.
may be formed.

<4> In the previous embodiment, a structure was explained in which the ring fixing member 6 was formed with the latching cutting edge 6a and the auxiliary cutting edge 6b, but in implementing the present invention,
The auxiliary cutting edge 6b may be omitted.

<5> Note that although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the pipe connection structure according to the present invention, FIG. 1 is a sectional view of the main part, and FIG. 2 A and B are A-A in FIG. 1, respectively.
3 is a cross-sectional view of the tube connection part, FIG. 4 A and B are sectional views taken along C-C line and D-D line in FIG. FIG. 6 is a sectional view corresponding to FIG. 1 and FIG. 2A showing different embodiments, respectively. FIG. 7 is a sectional view corresponding to FIG. 1 showing a conventional example. 1...Other pipe, 2...Pipe, 4...Connection ring, 4
a... recess, 4b... inner surface, 6... ring fixing member, 6a... cutting edge, 6B, 6C... tapered surface,
6X...End face, 7...Press bolt, 8...Holding piece, E...Action point, t...Tapered surface for pressing.

Claims (1)

[Scope of utility model registration request] A coupling ring 4 for coupling with another pipe 1 to be connected to the pipe 2 is fitted onto the pipe 2, and recesses are formed on the inner periphery of each of the coupling rings 4 at a plurality of locations spaced apart in the circumferential direction. 4a, and a tube 2 is inserted into each recess 4a.
A ring fixing member 6 that can be pressed and fixed on the outer peripheral surface of the pipe 2 is held, and the connecting ring 4 is pressed in an inclined posture that approaches the outer peripheral surface of the pipe 2 as the distance from the connecting end of the pipe 2 with the other pipe 1 increases. A push bolt 7 for pressing and operating the ring fixing member 6 against the outer circumferential surface of the pipe is screwed onto the connecting end side of the ring fixing member 6 through the tapered surface t. The latching cutting edge 6a bites into the outer circumferential surface of the pipe when pressed by 7.
is formed to have a longer length than the area E where the pressing force is applied by the push bolt 7 in the circumferential direction of the pipe 2, and a holding member for holding the ring fixing member 6 in the connecting ring 4. piece 8
and a pipe connection structure interposed between an end surface 6X of the ring fixing member opposite to the cutting edge 6a forming part and an inner surface 4b of the inner surface of the recess 4a that faces the end surface 6X. , the end surface 6X is
Tapered surfaces 6B and 6C are formed on both sides of the application point E of the pressing force by the push bolt 7, and the holding piece 8 are interposed in a state where they are in contact with each of the tapered surfaces 6B and 6C.