JP2605195B2 - Pipe joint structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint structure, and more particularly, to an improvement of a pipe joint structure applied when connecting various pipes.

[0002]

2. Description of the Related Art Conventionally, as this kind of pipe joint structure, there are, for example, an invention described in Japanese Patent Application Laid-Open No. 57-161391 and a device described in Japanese Utility Model Application Laid-Open No. 60-24990.

That is, in the former case, as shown in FIG. 6 (a), a set screw 20 is screwed into a screw hole 19 formed at a predetermined interval in a circumferential direction of the joint body 1b, thereby forming the screw hole. Ring-shaped tip 21 set in a biased state at 19
Is pressed, and the cutting edges 22, 22 formed on the inner peripheral edges of both ends of the tip 21 are cut into the outer peripheral surface of the tubular body C to connect the tubular body C.

On the other hand, in the latter case, as shown in FIG. 6 (b), a female screw portion 23 is formed on the inner peripheral surface of one end of the joint body 1b, and a ring-shaped push screw 24 is screwed into the female screw portion. As a result, the back surface of the ring-shaped tip 25 set in a biased state in the screw hole of the female screw portion 23 of the joint body 1b
The cutting edges 27, 27 formed at the inner peripheral edges of both ends of the tip 25 are cut into the outer peripheral surface of the tubular body C to connect the tubular body C.

[0005]

However, when the tube C is inserted into the joint body 1b, it is easy to set the two in a state where they are misaligned as shown in FIG. 7. Therefore, in the case of the former, in this state, If the setscrew 20 is screwed in, the tip 21 will not bite into the outer peripheral surface of the tube C, and the sealing effect of the packing 28 will be reduced and not only the fluid will leak, but also the tube C will be disengaged from the joint body 1b. It had a fatal problem of getting out. Further, the screwing work of the set screw 20 performed against the elastic force of the tip 21 is extremely complicated, and this is one of the causes of the above-mentioned poor biting.

Further, in the latter case, since the set screw body 24 is screwed into the female screw portion 23 of the joint body 1b, the pipe C is set out of center as described above, or the pipe C is set. If the screw itself is deformed or the like, the push screw body 24 cannot be screwed to the end, and even if it can be screwed in, the chip 25 cannot be sufficiently pressed against the elastic force of the chip 25. In this case, there is a disadvantage that the fluid leaks or the tube C is pulled out.

Further, the screwing operation of the push screw body 24 is extremely complicated, and the thread cutting work of the push screw body 24 and the joint main body 1b is troublesome, and the cost is extremely increased. is there.

Therefore, the present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a tube joint structure which can easily and surely connect pipes and is easy to manufacture. .

[0009]

That is, in order to solve the above-mentioned problems, the present invention is to fit a pipe to a joint body 1 in which a packing 3 and a movable body 4 for pressing the packing 3 are provided inside an opening 1a. In the pipe joint structure to be inserted and connected, a ring-shaped or partially cut-out ring-shaped first ring body 5 having an inward elastic force is attached to a groove 6 provided on the outer peripheral surface of the pipe. In order to press the first ring body 5 with the inner wall 7a and press the packing 3 at the tip end 7d via the movable body 4, a ring-shaped pressing body 7 is formed on the outer peripheral surface of the tubular body and the joint body 1 A ring-shaped second portion having an elastic force outward and having at least a partially cutout is formed in an annular concave portion 12 mounted between the inner peripheral surfaces of the joint body 1 and formed on the rear side of the inner peripheral surface of the joint body 1. A tubular body in which a two-ring body 14 is fitted so as to prevent the pressing body 7 from coming off. It is a hand structure.

[0010]

Accordingly, in the pipe joint structure characterized by the above-described structure, first, the pipe is inserted and set in the joint main body 1 in which the packing 3 and the movable body 4 are internally mounted, and then inserted into the pipe. The pressing body 7 is pressed between the tubular body and the joint body 1 until the inner wall 7a of the distal end of the pressed body 7 engages with the first ring body 5 attached to the groove 6 of the tubular body.

In this case, even if the tubular body and the joint body 1 are set in a state where they are misaligned, the pressing body 7
When the pipe is thin, the pipe can be connected straight to the joint body 1 while its deformation is corrected, and the packing 3 is a movable body. 4 receives an appropriate pressing force.

The second concave portion 12 of the joint body 1
When the ring body 14 is fitted, the pressing body 7 does not come off from the joint main body 1, so that the first ring body 5 and the second ring body 14 can prevent inadvertent removal of the tubular body. Thus, the pipe body and the joint body 1 can be securely and firmly connected.

[0013]

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1 and FIG. 2, reference numeral 1 denotes a return-shaped vertical main body which is externally fitted to the joined ends of stainless steel pipes A and B. The gasket 3 is inserted until it comes into contact with each of the protrusions 2 protruding from the substantially central portion of the inner peripheral surface, and has a notch in the openings 1 a formed on both sides of the protrusion 2, and presses the packing 3. Movable body 4 for
Are sealed in this order to seal the pipes A and B and the joint body 1.

Reference numeral 5 denotes a ring-shaped expandable / contractible first ring body in which a resilient force is applied inwardly to a groove 6 provided on the outer peripheral surface on the distal end side of each of the tubes A, B, that is, the first ring body. 5 is mounted in an expanded state.

7 is inserted between the vertical main body 1 and the pipes A and B to press the movable body 4 at the tip 7d,
This is a pressing body for pressing the ring body 5 with the inner wall 7a. The inner wall 7a is formed in a tapered shape so as to be able to engage with the first ring body 5 as shown in FIG. Is provided with a plurality of notches 8 at predetermined intervals in the circumferential direction. When the pressing body 7 is mounted, its rear end face is set to be flush with the rear end face of the joint body 1, and the inner diameter of the pressing body 7 is smaller than the outer diameter of the pipes A and B. Are formed in slightly larger dimensions.

Reference numeral 9 denotes a plurality of screw holes formed at predetermined intervals in the joint body 1 with an inclination angle orthogonal to the inclination angle of the notch surface 8 of the pressing body 7 mounted on the joint body 1. The tip end of the tightening body 10 screwed into 9 is in contact with the cutout surface 8 of the pressing body 7. Note that a hexagonal hole 11 is provided in the head of the fastening body 10.

Numeral 12 denotes annular concave portions formed on the inner peripheral surface of the end portion of the joint body 1 at the end portion. A plurality of through holes 13 communicating with the annular concave portions 12 are formed at predetermined intervals in a radial direction.
Reference numeral 14 denotes a partially cut-out second ring body as shown in FIG. 3, and a check / pull-out piece 16 made of thin aluminum is fastened to the vicinity of the cut-out portion 15, and its tip end is formed. It is naked from the joint body 1. In addition, the second ring body 1
The width L of the space 17 formed between the inner peripheral surface of the joint body 1 and the outer peripheral surface of the pressing body 7 is set so that the inner ring 4 can be inserted into the joint body 1. , The inserted second ring body 14 is fitted and fitted in the annular concave portion 12 of the joint body 1 in a state receiving an outward elastic force, and is engaged with the end of the pressing body 7. Its detachment is prevented.

The present embodiment is constructed as described above. When connecting each of the pipes A and B to the joint body 1, first, the first ring body 5 is inserted into the pipes A and B, The first ring member 5 is securely set in the groove portion 6 because the first ring member 5 has an inward elastic force.

Then, the packing 3 and the movable body 4 are mounted in the joint main body 1 and the ends of the pipes A and B are attached to the joint main body 1 in a state where the pipes A and B are externally fitted to the joint main body 1. Until it comes into contact with the convex portion 2 of. Thereafter, the pressing body 7 is pressed toward the joint body 1 and inserted between the joint body 1 and the pipe. Even if the pipes A and B are deformed, the inner periphery of the pressing body 7 is pressed. Even if such a love shape is corrected by the surface, and even if the tubes A and B are externally fitted to the joint body 1 in a state of misalignment, the tube A and B are fixed to the tapered surface of the inner wall 7a of the pressing body 7 while correcting the misalignment. As a result, the first ring body 5 is reliably pressed.

When the pressing body 7 is mounted at a desired position, its rear end face is dimensioned so as to be flush with the rear end face of the joint body 1, so that the mounting state can be checked visually or by tentacles. Easy to do.

Next, the tightening body 10 is screwed into the screw hole 9 of the joint body 1.
, The front end of the tightening body 10 comes into contact with the cutout surface 8 of the pressing body 7. In this case, even if the pressing body 7 is not inserted to the desired position, the screw hole 9 is inclined inward of the joint body 1. 1 can be moved inside, so that the pressing body 7 can be inserted to a desired position.

As a result, the separation of the pressing body 7 is prevented, and the first ring body 5 having an inward elasticity does not separate from the groove 6 of the tube body. Since the removal of A and B is prevented, the two pipes A and B can be reliably and firmly connected, and the packing 3 does not receive the appropriate pressing force and the fluid does not leak from the connection portion.

Next, when the second ring body 14 is inserted from the space 17 in a state where it is contracted against its elastic force, and the contracted state is released by the annular concave portion 12 of the joint body 1, the second ring body 14 is released. Reference numeral 14 is expanded and fitted in the annular concave portion 12 of the joint body 1 in a biased state. This attachment state can be confirmed by checking the second ring body 14 and also by the amount of the stripped piece 16 exposed.

In this case, since the second ring body 14 engages with the end of the pressing body 7, the joint body 1 of the pressing body 7
Will be prevented twice. In addition, since the second ring body 14 is partially cut-out ring-shaped, the second ring body 14 is engaged with the pressing body 7 over substantially the entire circumference when the second ring body 14 is attached to the annular concave portion 12, so that an excellent detachment preventing effect can be exhibited.

As described above, the connecting operation of the two tubes A and B can be performed very simply and quickly.

On the other hand, for example, the packing 3, the movable body 4, the first
When the pressing body 7 is detached from the joint body 1 to disassemble the ring body 5 and the like and disassembled, first, as shown in FIG. If the 2 ring body 14 is pressed and the check / pull-out piece 16 is pulled out in this state, the fitting state between the annular recess 12 of the joint body 1 and the second ring body 14 is partially released, and the same. By performing the work on other through holes 13,
The second ring body 14 can be easily removed.

Next, the tightening body 10 is screwed into the screw hole 9 of the joint body 1.
If the pressing body 7 is detached from the joint body 1 by
Each of the pipes A and B can be pulled out of the joint body 1,
The replacement of the first ring body 5 and the like and other repairs and repairs can be easily performed.

Since the pipe joint structure having the above structure has an extremely simple structure, it has an advantage that it can be manufactured easily and at low cost.

In the above embodiment, the distal end of the tightening member 10 screwed into the screw hole 9 of the joint body 1 is brought into contact with the notch 8 of the pressing member 7 to release the pressing member 7. Although the prevention is performed, the separation of the pressing body 7 can be sufficiently prevented only by the second ring body 14, so that the separation prevention means by the tightening body 10 is not necessarily required.

In this embodiment, the rear end face of the pressing body 7 is connected to the joint body 1 so that the mounting state of the pressing body 7 can be checked from the outside.
However, the rear end surface of the pressing body 7 may project from the joint body 1 by a predetermined dimension.

Further, it is possible to provide a flange 7b at the other end of the pressing body 7 as shown in FIG. 5, for example, and there is an advantage that the operation of inserting and removing the pressing body 7 can be easily performed. However, in this case, the flange 7b may be provided with a hole 7c for inserting the second ring body.

In this embodiment, a through-hole 13 communicating with the annular concave portion 12 of the joint body 1 is provided and a second ring body 14 is provided.
The check / pull-out piece 16 is attached to the above, but these are not necessarily provided, and may be provided as needed.
In the case where the through-holes 13 are provided, for example, if the through-holes 13 are formed in a long hole shape, it is possible to cope with one through-hole 14, and the specific number is not limited.

Further, the pipes A and B to be connected are not limited to those made of stainless steel, but can be applied to pipes made of cast iron or the like, and the specific material of the pipes does not matter.

Further, in this embodiment, the first ring body 5 is formed in a ring shape, but it may be formed in a partially notched ring shape, and the second ring body 14 is a ring having at least a partially notched ring. Any shape is acceptable.

In addition, the specific configuration such as the shape of the joint body 1 can be freely changed in any design within the range intended by the present invention.

[0037]

As described above, according to the present invention, the pressing body is mounted between the joint body and the pipe body. When the pressing body is mounted, the core is inserted while the misalignment of the tube is corrected by the inner peripheral surface thereof, and particularly when the tube is thin, even if the tube is deformed, etc. The pressing body can be mounted while the deformation or the like is corrected.
Therefore, a special effect is obtained in that the pipes are connected while being misaligned as in the related art, and there is no inconvenience that the fluid leaks from such connected portions.

Further, since the second ring body is configured to be fitted into the annular concave portion of the joint body so as to prevent the pressing body from being detached, the pipe body may be accidentally pulled out of the joint body. There is also an effect that the connection can be made surely and firmly without any.

Further, since the present invention is different from the conventional one in that the pressing body is pressed and attached to the joint body as described above, a series of connecting work becomes extremely easy, and the manufacturing thereof is also simplified. There is also a special effect that it can be performed at low cost.

[Brief description of the drawings]

FIG. 1A is a half sectional view of a pipe joint structure showing an embodiment of the present invention, and FIG. 1B is a schematic side view showing a part of FIG.

FIG. 2 is an enlarged sectional view of a main part showing a connection state between a pipe and a joint body.

FIG. 3 is a front view of a second ring body.

FIG. 4 is an enlarged side view of a main part showing a procedure for removing a second ring body.

FIG. 5 is an enlarged sectional view of a main part showing another embodiment.

6A and 6B are enlarged cross-sectional views of a main part showing a conventional example.

FIG. 7 is an enlarged cross-sectional view of a main part showing a conventional connection state of pipes.

[Explanation of symbols]

 A: pipe B: pipe 1 ... joint body 1a ... opening 3 ... packing 4 ... movable body 5 ... first ring body 6 ... groove 7 ... pressing body 7a ... inner wall 7b ... flange 7c ... hole 7d ... tip DESCRIPTION OF SYMBOLS 8 ... Notch surface 9 ... Screw hole 10 ... Tightening body 12 ... Annular concave part 13 ... Through hole 14 ... Second ring body 16 ... Confirmation and extraction piece 17 ... Space part

Claims (6)

(57) [Claims] 1. An outer peripheral surface of a tubular body in a tubular body joint structure in which a tubular body is inserted and frozen in a joint body 1 in which a packing 3 and a movable body 4 for pressing the packing 3 are provided in an opening 1a. The first ring body 5 is pressed by the inner wall 7a in order to mount the first ring body 5 having a ring shape or a partially cut-out ring shape and having an inward elastic force into the groove portion 6 provided at A pressing body 7 of a ring body, which presses the packing 3 via the movable body 4 at the portion 7d, is connected to the outer peripheral surface of the tubular body and the joint main body 1.
A ring-shaped recessed portion having an elastic force outward and having at least a partially cutout is provided in an annular concave portion 12 mounted between the inner peripheral surfaces of the joint body 1 and formed on the rear side of the inner peripheral surface of the joint body 1. Second
A pipe joint structure, wherein a ring body 14 is fitted to prevent the pressing body 7 from coming off. 2. The joint body 1 is provided with a screw hole 9 which is inclined inward, and the tightening body 1 is provided in the screw hole 9.
0 is screwed in, and the leading end thereof is brought into contact with a cutout surface 8 formed on the outer peripheral surface of the pressing body 7 with an inclination angle orthogonal to the inclination angle of the screw hole 9, thereby pressing the pressing body. 7 is moved to the joint body 1 side, and the packing 3 is moved through the movable body 4.
The pipe joint structure according to claim 1, wherein the pipe joint structure is configured to be able to press. 3. The joint body 1 has an annular recess 12
The pipe joint structure according to claim 1 or 2, wherein at least one or more through-holes (13) communicating with the pipe are provided in a radial direction. 4. The two-ring body 14 includes a check / pull-out piece 16 that projects out of the joint body 1 when the second ring body 14 is mounted in the annular recess 12.
The pipe joint structure according to any one of claims 1 to 3, wherein one end thereof is fixed to the pipe (4). 5. A flange 7b is provided at one end of the pressing body 7, and the flange 7b has a hole 7 for mounting the second ring body.
The pipe joint structure according to any one of claims 1 to 4, wherein c is provided. 6. The space 17 formed between the outer peripheral surface of the rear part of the pressing body 7 and the inner peripheral surface of the joint body 1 is formed to have a size into which the second ring body 14 can be inserted. 6. The pipe joint structure according to any one of 1 to 5.