JP3763875B2 - Pipe fitting - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pipe joint mainly used for a vertical pipe of a sewer.
[0002]
[Prior art]
In the case of connecting a vinyl chloride pipe, an adhesion method as described in Japanese Patent Publication No. 53-33773 is generally employed. However, if the pipes are fixed together by bonding, the pipes are easily destroyed when the ground is distorted or the building vibrates due to an earthquake.
[0003]
On the other hand, as described in Japanese Utility Model Publication No. 56-49383 and Japanese Utility Model Publication No. 54-25702, a pipe having a receiving port at the end and an annular packing attached to the inner periphery of the receiving port. A technique of connecting pipes using a joint is also employed, and it is also known that this technique is more effective in preventing breakage of pipes during an earthquake than the above-described bonding method.
[0004]
[Problems to be solved by the invention]
However, in the technique using the conventional pipe joint, the annular packing is used for the purpose of sealing the gap between the inner peripheral surface of the receiving port and the outer peripheral surface of the tube inserted into the receiving port. Since the cross-sectional shape of the packing is small, the difference between the inner diameter of the receiving port and the outer diameter of the pipe is also small, so when connecting vertical pipes that are piped in the vertical direction, the vertical pipe and the pipe joint are in the vertical direction. Even if the displacement at the time of relative movement can be absorbed, the displacement at the time of relative movement in the lateral direction can hardly be absorbed, and there is a problem that it is very weak against rolling.
[0005]
Moreover, even if an annular packing having a large cross-sectional shape is used and the difference between the inner diameter of the receiving port and the outer diameter of the tube is increased, soil and sand can easily enter the gap between the receiving port and the tube. There arises a new problem that it is difficult to align the axis with the axis of the tube.
[0006]
Furthermore, since a step is generated between the inner peripheral surface of the pipe joint and the inner peripheral surface of the pipe, there is also a problem that when used in a sewer, dirt is caught on the step and causes clogging.
[0007]
Therefore, the present invention focuses on the above-mentioned problems, and the first object is to provide a pipe joint that is strong against both pitching and rolling, and causes filth to be caught even when used in sewers. The second object is to provide a pipe joint that is not made.
[0008]
[Means for Solving the Problems]
In order to achieve the first and second objects, in the pipe joint according to claim 1 of the present invention, at least one end of the tubular part is provided with a receiving port having a larger diameter than the tubular part. And a cap made of an elastic body centered on an insertion port that can be inserted into an end of a tube having a diameter substantially equal to that of the tubular portion and fitted to the tip of the receiving port, and an inner peripheral surface of the receiving port An annular packing made of an elastic material, and having an inner peripheral surface that is in close contact with an outer peripheral surface of an end portion of a pipe inserted into the receiving port, and an inner peripheral surface of the annular packing 3. A pipe according to claim 2, wherein a small-diameter portion is provided to continuously connect the inner peripheral surface of the tubular portion of the joint body and the inner peripheral surface of the end portion of the pipe inserted into the receiving port. In the joint, the annular packing is a cross section opened to the back side of the receiving port. The pipe joint according to claim 3 of the present invention has a U-shaped configuration, and the annular packing is formed in a substantially U-shaped cross section that opens to the distal end side of the receiving port. In the pipe joint according to Item 4, the annular packing is formed to have a hollow cross section.
[0010]
[Action]
In the pipe joint according to the first aspect of the present invention, when the vertical pipe piped in the vertical direction is inserted from the insertion port of the cap and inserted into the receiving port, the axial center of the vertical tube and the axial center of the receiving port are aligned by the cap. The outer peripheral surface of the end portion of the vertical tube is in close contact with the inner peripheral surface of the annular packing. Therefore, even if an annular packing with a large cross-sectional shape is used so that the difference between the inner diameter of the receiving port and the outer diameter of the vertical tube is increased, the gap between the vertical tube and the receiving port is blocked with a cap, Sediment and garbage will not enter the interior.
[0011]
In addition, the vertical tube is movable in the vertical direction along the inner peripheral surface of the annular packing, and is also movably connected in the lateral direction because the annular packing and the cap are formed of an elastic body. Not only the displacement when the vertical pipe and the pipe joint are relatively moved in the vertical direction, but also the displacement when the vertical pipe and the pipe joint are relatively moved in the horizontal direction can be absorbed.
Furthermore, when a vertical pipe piped in the vertical direction is inserted from the insertion port of the cap and inserted into the receiving port, the inner peripheral surface of the tubular portion of the joint body is connected to the inner peripheral surface of the annular packing by a small diameter portion provided on the inner peripheral surface of the annular packing. The inner peripheral surface of the end of the vertical tube is continuous. Therefore, even if used in the sewer, filth is not caught.
[0012]
In the pipe joint according to the second aspect of the present invention, since the annular packing is formed in a substantially U-shaped cross section opened to the back side of the receiving port, it is deformed when the vertical pipe and the pipe joint are relatively moved in the lateral direction. It is easy and absorbs lateral displacement.
[0013]
In the pipe joint according to the third aspect of the present invention, since the annular packing is formed in a substantially U-shaped cross section opened to the front end side of the receiving port, it is deformed when the vertical pipe and the pipe joint are relatively moved in the lateral direction. It is easy to absorb the displacement when the vertical pipe and pipe joint move relative to each other in the horizontal direction, and when the vertical pipe and pipe joint move relative to each other in the horizontal direction, the cross-sectional shape of the back part of the receiving port is the original shape. Since it can hold | maintain in a close state, it can prevent that a big level | step difference arises at the back of a receptacle.
[0014]
In the pipe joint according to claim 4 of the present invention, since the annular packing is formed in a hollow cross section, the pipe and the pipe joint are easily deformed when the vertical pipe and the pipe joint are relatively moved in the lateral direction. Absorbance of displacement when moving relatively in the horizontal direction is good, and when the vertical pipe and fitting move relatively in the horizontal direction, the cross-sectional shape of the back part of the receiving port can be kept close to the original shape, so It is possible to prevent a large step from occurring in the back. Furthermore, when the vertical pipe and the pipe joint move relative to each other in the lateral direction and a part of the annular packing is compressed and deformed, the air in the hollow part moves in the circumferential direction in the hollow part, so that the distance between the vertical pipe and the receiving port is increased. Since the annular packing swells on the wide side, even if the vertical pipe and the pipe joint move relative to each other in the lateral direction, a gap is hardly generated between the vertical pipe and the receiving port.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
First, the pipe joint of Embodiment 1 will be described in detail. FIG. 1 is a cross-sectional view of a pipe joint A according to the first embodiment, and this pipe joint A is composed of a joint body 1, a cap 2, and an annular packing 3.
[0017]
The joint body 1 includes a cylindrical portion 11 and a receiving port 12 that is provided at one end of the cylindrical portion 11 and has a larger diameter than the cylindrical portion 11. The joint body 1 is generally formed of a thermoplastic resin such as a hard vinyl chloride resin or a polyethylene resin, but is not particularly limited.
[0018]
The cap 2 is formed of an elastic body such as natural rubber or synthetic rubber, and is fitted to the tip of the receiving port 12. The cap 2 has an insertion port 21 into which an end of a pipe P having a diameter substantially equal to that of the cylindrical portion 11 can be inserted, and the receiving port 12 has an opening on the receiving end 12 side. A projecting piece 22 projecting toward the back of 12 is provided.
[0019]
The annular packing 3 is formed of an elastic body such as natural rubber or synthetic rubber, and is provided in close contact with the inner peripheral surface and the inner surface of the receiving port 12. Further, the annular packing 3 is formed in a substantially U-shaped cross section that opens to the distal end side of the receiving port 12, and the inner peripheral surface thereof is in close contact with the outer peripheral surface of the end portion of the pipe P inserted into the receiving port 12. And a small-diameter portion 32 that connects the inner peripheral surface of the tubular portion 11 of the joint body 1 and the inner peripheral surface of the end portion of the pipe P. Further, the upper end portion of the inner peripheral surface is locked to the protruding piece 22 of the cap 2, and the end portion of the pipe P inserted from the insertion port 21 of the cap 2 can be smoothly guided to the inside of the annular packing 3. It can be done.
[0020]
Although it has been described above that the cap 2 and the annular packing 3 are formed of an elastic body such as natural rubber or synthetic rubber, the elastic body may be filled with fibers, an inorganic material, or the like. The annular packing 3 is formed by, for example, extruding a material such as natural rubber or synthetic rubber into a U-shaped cross section, then cutting it to an appropriate length, and fusing and joining the end faces to form an annular shape. Can be manufactured by.
[0021]
Next, a usage example of the pipe joint A will be described with reference to FIG. In FIG. 2, is a fabric foundation K of a building, and a connection drain pipe P1 connected to an indoor building drain pipe (not shown) passes through the cloth foundation K, and the outdoor side of the connection drain pipe P1. A drainage vertical pipe P2 is connected to the end of this through an elbow E1. Further, in the ground, a site drainage pipe P3 having one end connected to a drainage basin or a manhole (not shown) is buried sideways, and an elbow E2 is connected to the other end of the site drainage pipe P3. Yes. The pipe joint A of the present embodiment is used to connect the elbow E2 and the drainage vertical pipe P2.
[0022]
FIG. 3 is an enlarged view of the main part of FIG. 2. One end of the elbow E2 embedded in the ground is fitted to the cylindrical part 11 of the joint body 1, and the lower end of the drainage vertical pipe P2 is the cap 2. Is inserted from the insertion port 21 and inserted into the receiving port 12.
[0023]
At this time, in the drainage vertical pipe P2, the axis of the drainage vertical pipe P2 and the axis of the receiving port 12 are aligned by the cap 2, and the outer peripheral surface of the end is a large diameter portion of the inner peripheral surface of the annular packing 3 31 is in close contact. Therefore, even if the cross-sectional shape of the annular packing 3 is large due to the large difference between the inner diameter of the receiving port 12 and the outer diameter of the drainage vertical tube P2, the gap between the drainage vertical tube P2 and the receiving port 12 is blocked by the cap 3. As a result, earth and sand and dust do not enter the interior of the receiving port 12.
[0024]
Further, the drainage vertical pipe P2 is movable in the vertical direction indicated by the arrow Y along the large-diameter portion 31 on the inner peripheral surface of the annular packing 3, and the annular packing 3 and the cap 2 are formed of an elastic body. As a result, the drainage vertical pipe P2 and the pipe joint A are not only displaced in the vertical direction but also moved in the horizontal direction. Can also be absorbed. Moreover, since the annular packing 3 is formed in a substantially U-shaped cross section that opens to the distal end side of the receiving port 12, it is easy to deform when the drainage vertical pipe P2 and the pipe joint A are moved relative to each other in the horizontal direction. When the drainage vertical pipe P2 and the pipe joint A are moved relative to each other in the horizontal direction, the cross-sectional shape of the back part of the receiving port 12 is kept close to the original shape as shown by the two-dot chain line. Therefore, it is possible to prevent a large step from occurring in the back of the receiving port 12.
[0025]
That is, in this pipe joint A, when connected to the drainage vertical pipe P2, it is possible to absorb the displacement when the drainage vertical pipe P2 and the pipe joint A are relatively moved in the vertical direction, and in the lateral direction. Since it can absorb the displacement when it moves relatively, it is strong against both pitch and roll. In addition, even if the drainage vertical pipe P2 and the pipe joint A move relative to each other in the lateral direction, it is possible to prevent a large step from occurring in the depth of the receiving port, so that the drainage vertical pipe P2 and the pipe joint A are laterally moved. The drainage efficiency does not decrease after the relative movement.
[0026]
Next, the pipe joint B of Embodiment 2 will be described based on FIG.
This pipe joint B is provided with a plurality of circumferentially extending protrusions 23 in the insertion port 21 of the cap 2b so that water can be reliably stopped between the pipe P inserted from the insertion port 21 and the cap 2b. It has become. Further, the cap 2b is not provided with the protruding piece 22, and the end of the large-diameter portion 31 of the annular packing 3b is curved to the outer peripheral side, so that the pipe P inserted from the insertion port 21 is formed. The end portion can be smoothly guided to the inside of the annular packing 3b. Further, a locking ring 4 is provided between the receiving port 12 and the cap 2b, and the outer periphery of the annular packing 3b is inserted into the locking ring 4 when the pipe P is pushed inside the annular packing 3b. A locking portion 41 is provided so that the portion does not move in the opposite direction to the pushing direction of the pipe P. Since other configurations are the same as those of the first embodiment, the same reference numerals as those of the first embodiment are given to the drawings, and description thereof is omitted.
[0027]
Next, the pipe joint C of Embodiment 3 will be described based on FIG. In this pipe joint C, an annular packing 3 c is formed in a substantially U-shaped cross section that opens to the back side of the receiving port 12. Therefore, the cap 2c is not provided with the protruding piece 22 for locking the annular packing 3c. Since other configurations are the same as those of the first embodiment, the same reference numerals as those of the first embodiment are given to the drawings, and description thereof is omitted.
[0028]
Next, the pipe joint D of Embodiment 4 is demonstrated based on FIG. 6 and FIG.
In the pipe joint D, the annular packing 3d is formed in a hollow cross section. Therefore, the cap 2d is not provided with the protruding piece 22 for locking the annular packing 3d. In addition, when the drainage vertical pipe P2 and the pipe joint D are relatively moved in the horizontal direction and a part of the annular packing 3d is compressed and deformed in the use state as shown in FIG. 7, the air in the hollow portion is circumferentially moved in the hollow portion. Since the annular packing 3d swells as shown by a two-dot chain line on the side where the interval between the drainage vertical pipe P2 and the receiving port 12 is widened, the drainage vertical pipe P2 and the pipe joint D are relatively moved in the lateral direction. Even so, it is difficult for a gap to be formed between the drainage vertical pipe P2 and the receiving port 12.
[0029]
The embodiment of the present invention has been described in detail with reference to the drawings, but the specific configuration is not limited to this embodiment, and even if there is a design change or the like without departing from the gist of the present invention. It is included in the present invention. For example, in the embodiment, the pipe joint in which the receiving port is provided at one end of the cylindrical part is shown, but the receiving port may be provided at both ends of the cylindrical part. Further, the cylindrical portion does not need to be formed straight, and may be formed by bending or bending at a predetermined angle so that it can be used instead of the elbow.
[0030]
【The invention's effect】
As described above, in the pipe joint according to claims 1 to 4 of the present invention, when the vertical pipes connected in the vertical direction are connected, the vertical pipe and the pipe joint are relatively moved in the vertical direction. Can be absorbed, and can also absorb the displacement when moved relatively in the lateral direction, so that the effect of being strong against both pitch and roll is obtained.
In addition, when connecting vertical pipes that are piped in the vertical direction, the inner peripheral surface of the tubular portion of the joint body and the end of the vertical pipe are formed by the small-diameter portion provided on the inner peripheral surface of the annular packing. Since it can be made continuous with the peripheral surface, it is possible to obtain an effect that filth is not caught even when used in the sewer.
[0031]
In the pipe joint according to the third aspect of the present invention, even if the vertical pipe and the pipe joint move relative to each other in the lateral direction, it is possible to prevent a large step from occurring in the back of the receiving port. The effect that the drainage efficiency is not lowered after the joint and the relative movement in the lateral direction can be obtained.
[0032]
In the pipe joint according to claim 4 of the present invention, even if the vertical pipe and the pipe joint move relative to each other in the lateral direction, it is possible to prevent a large step from occurring in the back of the receiving port, Since it is possible to prevent a gap from being formed between the receiving ports, an effect that the drainage efficiency does not decrease after the vertical pipe and the pipe joint relatively move in the horizontal direction can be obtained.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a pipe joint according to a first embodiment.
FIG. 2 is a perspective view showing an example of use of the pipe joint of the first embodiment.
FIG. 3 is a longitudinal sectional view of a main part III in FIG. 2;
FIG. 4 is a longitudinal sectional view of a pipe joint according to a second embodiment.
FIG. 5 is a longitudinal sectional view of a pipe joint according to a third embodiment.
FIG. 6 is a longitudinal sectional view showing a pipe joint of a fourth embodiment.
FIG. 7 is a longitudinal sectional view showing a usage state of a pipe joint according to a fourth embodiment.
[Explanation of symbols]
A, B, C, D Pipe fitting 1 Fitting body 11 Tubular portion 12 Receiving port 2, 2b, 2c, 2d Cap 21 Insertion port 3, 3b, 3c, 3d Annular packing 32 Small bore

Claims (4)

At least one end of the cylindrical part, a joint body provided with a receiving port having a larger diameter than the cylindrical part,
A cap made of an elastic body having an insertion port that can be inserted into an end portion of a pipe that is fitted to a tip portion of the receiving port and has a diameter substantially equal to the cylindrical portion,
An annular packing made of an elastic body, having an inner peripheral surface that is provided in close contact with the inner peripheral surface of the receiving port, and has an inner peripheral surface that is in close contact with the outer peripheral surface of the end of the pipe inserted into the receiving port;
With
A small-diameter portion is provided on the inner peripheral surface of the annular packing to connect the inner peripheral surface of the tubular portion of the joint body and the inner peripheral surface of the end of the pipe inserted into the receiving port. Pipe fittings.   The pipe joint according to claim 1, wherein the annular packing is formed in a substantially U-shaped cross section that opens to the back side of the receiving port.   The pipe joint according to claim 1, wherein the annular packing is formed in a substantially U-shaped cross section that is open to a tip end side of the receiving port.   The pipe joint according to claim 1, wherein the annular packing is formed in a hollow shape in cross section.

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