JPH0413494Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a joint used for integrally connecting a straight pipe and a flexible pipe with high flexibility.

[Prior Art] Conventionally, in construction work in which straight pipes are installed between manholes in order to form an underground conduit, if there are already installed underground objects such as water pipes or gas pipes, In order to bypass this and arrange the pipe, the associated means and construction work are complicated and expensive, and other problems are inevitable. Establishing another burial route to deal with this buried object is
This will require changes to the construction plan, requiring more labor and expense.

In order to deal with and bypass such buried objects, it has been proposed to use flexible pipes and connect the flexible pipes to the pipes. Conventionally, this connection has been made by using a split-open type gripper with an inner peripheral surface that follows the waveform of the outer peripheral surface of the flexible tube and a smooth outer peripheral surface, as seen in Japanese Utility Model Application Publication No. 58-31490. A coupling body having an engagement hole into which the pipe is inserted and held fixedly is used, the outer circumferential surface of the flexible pipe is covered with a gripping body, this is inserted into the coupling body and the pipe is fixedly held, and the pipe is inserted into the other engagement hole of the coupling body. The two have been connected by inserting and holding them in place.

[Problems to be solved by the invention] Although the conventional method of using a gripping body and a coupling body is easy to install, there is a problem in that the connection between the coupling body and the gripping body is weak. The object of the present invention is to provide a joint that can more reliably connect a straight pipe and a flexible pipe together.

[Means for Solving the Problems] The joint of the present invention is a joint that is connected to a flexible pipe that has grooves and protrusions that extend continuously or circularly around the outer circumferential surface, and that has the shape of the outer circumferential surface of the flexible pipe. The flexible tube has an inner circumferential surface that corresponds to the flexible tube and has an inner circumferential surface whose inner diameter decreases from one end to the other end, and an outer circumferential surface whose diameter is substantially constant, is made of a material with lower rigidity than the flexible tube, and is divided into at least two parts along the axial direction. an intermediate joint part that covers the outer periphery of the flexible pipe; and an intermediate joint part that is made of a material that is more rigid than the flexible pipe;
A tubular joint main body having a joint hole having a substantially constant diameter at one end on the inner circumferential surface into which the intermediate joint portion covered by the flexible pipe is inserted, and a joint hole into which the pipe is inserted at the other end; It is characterized by being composed of.

The flexible pipe in which the joint of this invention is used is
It is tubular and has continuous spiral grooves and protrusions on the outer circumferential surface like the outer circumferential surface of a bolt, or it has grooves and protrusions that are formed alternately and the grooves and protrusions go around the circumference in a circle. be. These alternately formed protrusions and grooves allow the flexible tube to contract or expand in the axial direction, making it possible to bend or the like, thereby providing excellent flexibility.

The intermediate joint portion constituting the joint of the present invention is a whole having an inner peripheral surface that substantially corresponds to the outer peripheral surface of the flexible pipe and whose inner diameter decreases from one end to the other end, and a flat outer peripheral surface whose diameter is approximately constant. It has a single tubular shape and is divided into at least two parts in the axial direction. This intermediate joint portion contacts and covers the uneven outer circumferential surface of the flexible tube so as to make a complete circumference, and turns the uneven outer circumferential surface of the flexible tube into a flat outer circumferential surface having a substantially constant diameter. When the intermediate joint part is divided into two parts, it is preferable that the intermediate joint part is divided into two parts in a plane including the central axis. In the case of three divisions, it is preferable that the division is axially symmetrical with a central angle of 120 degrees. The intermediate joint portion is made of a material less rigid than the flexible pipe, such as flexible resin or rubber.

The tubular joint body constitutes the main part of the joint, and is made of a material that is more rigid than the flexible pipe. This tubular joint main body has at least one end of the joint hole into which the intermediate joint portion covered by the flexible pipe is inserted, and whose inner peripheral surface has a substantially constant diameter, and the other end thereof has a joint hole into which the pipe is inserted. have,
It has at least one through hole. The tubular joint body itself may be the same as a normal joint for connecting straight pipes with a constant diameter. Further, the tubular joint main body may have two, three, or more joint holes with the same or different diameters on the inner circumferential surface.

[Operations and Effects of the Invention] The joint of the present invention having the above-mentioned configuration covers the outer circumferential surface of the end of the flexible pipe to be joined with the divided intermediate joint part, and the outer circumferential surface of the end is covered with a flat surface with a large diameter, In other words, it is shaped like a regular pipe with a constant diameter. Since the intermediate joint part is divided in the axial direction, it is possible to easily coat the outer circumferential surface of the flexible pipe, which has irregularities, due to the protrusions and grooves. Further, since the inner circumferential surface of the intermediate joint portion and the outer circumferential surface of the flexible tube do not have mirror-like corresponding surfaces, it is difficult to form a large gap between the two surfaces, and the adhesion is high.

Thereafter, the flexible tube covered with the intermediate joint portion is inserted and fixed into the joint hole at one end of the tubular joint body.
This insertion and fixation is exactly the same as inserting and fixing a regular diameter pipe into a conventional fitting.
Further, a pipe is inserted and fixed into the joint hole at the other end of the tubular joint main body.

Here, the intermediate joint portion is formed of a material that is less rigid than the flexible pipe, and the tubular joint body is formed of a material that is more rigid than the flexible pipe. As a result, the intermediate joint portion, which has the lowest rigidity, is held between the flexible tube and the tubular joint body in an elastically compressed state, so that the three members are tightly coupled with high sealing performance. In addition, since the inner diameter of the intermediate joint part decreases from one end to the other, the amount of deformation that is elastically compressed increases in the part where the inner diameter decreases, and the above three parts are more firmly connected. be done.

In addition, when covering the intermediate joint part on the flexible pipe and inserting and fixing it into the joint hole of the tubular joint body,
The fixation can be further strengthened by using a sealant, adhesive, etc. on the joint surfaces.

This will be explained below using examples.

[Example 1] The joint of the first embodiment of the present invention is shown in Figures 1 to 4.
9 and 10, respectively. This joint includes a tubular joint body 1 whose longitudinal section is shown in FIG.
It is composed of a pair of intermediate joint parts 2 and 2' divided into two parts. This joint is for connecting a flexible pipe 3 whose side view is shown in FIG.

In addition, FIG. 2 shows a side view of one of the two divided intermediate joint parts 2.

The tubular joint body 1 has a first joint hole 1a, into which a pipe 4 is inserted and fixed, and a second joint hole 1a, which has an inner peripheral surface with different diameters at both ends, and into which a flexible pipe 3 covered with intermediate joint parts 2 and 2' is inserted and fixed. It has two joint holes 1b and a central hole 1c that connects both. Central hole 1c
has a smaller hole diameter than the first joint hole 1a and the second joint hole 1b, and the side surfaces at both ends thereof serve as stopper surfaces for the pipe 4, the intermediate joint parts 2 and 2', and the flexible pipe 3, respectively. . Note that this tubular joint body 1 is made of synthetic resin that is harder than the flexible tube 3.

The intermediate joint parts 2 and 2' are made by dividing a cylindrical pipe into two equal parts in the axial direction, as shown in FIGS.
It has a slightly smaller outer circumferential diameter corresponding to the inner circumferential surface of b. As shown in FIG. 2, the inner circumferential surfaces of the intermediate joints 2 and 2' are alternately formed with protrusions 21 and grooves 22 that extend in the circumferential direction and form a circle as a whole. There is almost a mirror correspondence relationship. Each inner diameter decreases slightly from one end to the other as shown in FIG. Therefore, the thickness of the intermediate joint portions 2, 2' increases slightly from one end to the other end, that is, from the left side to the right side as shown in FIG. The intermediate joint portions 2, 2' are made of a soft synthetic resin that is softer than the flexible tube 3.

As shown in FIG. 3, the flexible tube 3 has a tubular shape whose diameter changes periodically and repeatedly in the axial direction, and is highly flexible. As shown in FIG. 3, the outer circumferential surface of the flexible tube 3 is alternately formed with protrusions 31 and grooves 32 that extend in the circumferential direction and form a circle as a whole. Although the inner circumferential surface and the mirror surface correspond to each other, the outer diameters of each are formed to be approximately constant.

In the joint of the first embodiment, first, as shown in FIG. 9, a set of two intermediate joint parts 2, 2' which are divided into two parts are covered on the outer circumferential surface of one end of the flexible pipe 3. That is, as shown in FIG. 4 and FIG.
In addition, the protrusions 21 of the intermediate joint portions 2 and 2' are fitted into the grooves 32 of the flexible tube 3, respectively.
As shown in FIG. 9, the pair of intermediate joints 2 and 2' are arranged such that the end surface of the inner peripheral surface having the larger diameter is aligned with the end surface of the flexible tube 3. The end portion with a larger inner circumferential diameter shown on the left side of FIG. 2 is thinner than the end portion with a smaller inner diameter shown on the right side of FIG. Therefore, the diameter of the outer peripheral surface on the end surface side of the intermediate joint parts 2, 2' that cover the end surface side of the flexible pipe 3 is the inner circumference of the second joint hole 1b of the tubular joint body 1, as shown on the left side in FIG. It has a diameter slightly smaller than the diameter of the outer circumferential surface of the intermediate joint portion 2 before deformation.
However, the diameter of the outer circumferential surface of the end of the intermediate joint portions 2, 2' that cover the portion of the flexible tube 3 that is farther from the end surface is
Since the diameter of the inner circumferential surface of this portion is small, the flexible tube 3 is overlapped with the flexible tube 3 as shown on the right side in FIG. The end of the flexible tube 3 covered with the intermediate joint parts 2, 2' is inserted and fixed into the second joint hole 1b of the tubular joint body 1, as shown in FIG. At this time, since the diameter of the outer circumferential surface on the distal end side of the flexible tube 3 that covers the intermediate joint parts 2, 2' is slightly smaller than the diameter of the inner circumferential surface of the second joint hole 1b, the distal end thereof can be easily removed. It can be inserted into the second engagement hole 1b.
However, at the time of insertion, the diameter of the outer circumferential surface of the intermediate joint portions 2, 2' increases as the distance from the tip increases due to being covered with the flexible tube 3 as shown in FIG. It takes a lot of force to do that. Inserted intermediate joint part 2
The other end portion of 2' is the second joint hole 1 of the tubular joint body 1.
The inner circumferential surface of the second joint hole 1b and the outer circumferential surface of the flexible tube 3 are compressed by the inner circumferential surface of the second joint hole 1b and the outer circumferential surface of the flexible tube 3. Closely adheres to the surface. Therefore, the tubular joint body 1 and the flexible pipe 3 are connected to the intermediate joint portions 2, 2'.
It is firmly fixed through. This state is shown in the vertical sectional views of FIGS. 4 and 10. Note that the first joint hole 1b
A normal pipe 4 is inserted and fixed therein as shown in FIGS. 4 and 10.

By using the joint of the first embodiment described above, one end of the flexible pipe 3, which has many irregularities, can be connected to the second end.
It can be inserted and fixed into the joint hole 1b without wobbling.
Further, when joining, the flexible pipe 3, pipe 4, and tubular joint body 1 can be connected without rotating, and workability is extremely excellent when working on long pipes.

[Second Embodiment] The joint of the second embodiment of the present invention is shown in FIGS. 5 to 8.
As shown in the figure. This joint is composed of a tubular joint main body 5 whose longitudinal section is shown in FIG. 5, and a pair of intermediate joint parts 6, 6' which are divided into two parts. This joint is the 7th
This is for connecting a flexible pipe 7 whose side view is shown in the figure. In addition, FIG. 6 shows a side view of one of the two divided intermediate joint parts 6.

The tubular joint body 5 has a first joint hole 5a at both ends into which pipes 4 having different hole diameters are inserted and fixed, and a second joint hole 5b into which a flexible pipe 7 covered with intermediate joint parts 6 and 6' is inserted and fixed. and a central hole 5c connecting the two. The center hole 5c has a smaller hole diameter than the first joint hole 5a and the second joint hole 5b, and the side surfaces at both ends thereof are stopper surfaces for the pipe 4, the intermediate joint portions 6 and 6', and the flexible pipe 7, respectively. It's summery. Note that this tubular joint body 5 is made of synthetic resin that is harder than the flexible tube 7.

The intermediate joint parts 6, 6' are made by dividing a cylindrical tube into two equal parts in the axial direction, and the outer peripheral surface thereof has a slightly smaller outer peripheral diameter corresponding to the inner peripheral surface of the second joint hole 5b of the tubular joint body 5. have. As shown in FIG. 6, the inner circumferential surfaces of the intermediate joint portions 6, 6' are formed with continuous spiral protrusions 61 and grooves 62, and have substantially mirror-like correspondence with the outer circumferential surface of the flexible tube 7. The inner diameter of each of them decreases slightly from one end to the other, as shown in FIG. Therefore, the thickness of the intermediate joint portions 6, 6' increases slightly from one end to the other end, that is, from the left side to the right side as shown in FIG. Note that this intermediate joint portion 6 is made of a soft synthetic resin that is softer than the flexible tube 7.

The flexible pipe 7 has protrusions 7 as shown in FIG.
It has a tubular shape with an outer peripheral surface in which the grooves 1 and 72 are continuous in a spiral shape, and is highly flexible. As mentioned above, the outer circumferential surface of the flexible pipe 7 has the intermediate joint portion 6,
Although the inner peripheral surface of 6' corresponds to a mirror surface, its outer diameter is formed to be approximately constant.

Similarly to the joint of the first embodiment, the joint of the second embodiment first covers the outer circumferential surface of one end of the flexible tube 7 with a pair of intermediate joint parts 6, 6' divided into two parts. That is, as shown in FIG.
The groove 62 of the flexible tube 7 is fitted into the groove 72 of the flexible tube 7, and the protrusion 61 of the intermediate joint portions 6, 6' is fitted into the groove 72 of the flexible tube 7, respectively. The pair of intermediate joints 6, 6' is arranged such that the end face of the inner peripheral surface having the larger diameter is aligned with the end face of the flexible tube 7, as in the first embodiment. The end portion of the flexible tube 7 covered with the intermediate joint portions 6, 6' is inserted and fixed into the second joint hole 5b of the tubular joint body 5. At this time, the intermediate joint portion 6,
The diameter of the outer circumferential surface on the distal end side of the flexible tube 7 covered with the flexible tube 6' is slightly smaller than the diameter of the inner circumferential surface of the second joint hole 5b, so that the distal end can be easily inserted into the second joint hole 5b. can. For subsequent insertions,
The intermediate joint part 6, as it gets farther from the tip part,
Since the diameter of the outer circumferential surface of 6' is increased by being covered by the flexible tube 7, a large force is required to insert it into the second joint hole 5b. As shown in FIG. 8, the other end of the inserted intermediate joint 6, 6' is compressed between the inner peripheral surface of the second joint hole 5b of the tubular joint body 5 and the outer peripheral surface of the flexible tube 7, and the intermediate joint Deformed due to the softness of the material of the parts 6, 6' themselves,
The inner circumferential surface of the second joint hole 5b and the outer circumferential surface of the flexible tube 7 are in close contact. Therefore, the tubular joint main body 5 and the flexible tube 7 are firmly fixed via the intermediate joint portions 6, 6'.

A normal pipe 4 is inserted and fixed into the first joint hole 5a. This state is shown in the longitudinal sectional view of FIG.

By using the joint of this second embodiment,
One end of the flexible tube 7, which has many irregularities, can be inserted and fixed into the second joint hole 5b without wobbling. In addition, when joining, the flexible pipe 7, pipe 4, and tubular joint body 5 can be connected without rotating.
Extremely good workability when working on long pipes.

[Brief explanation of the drawing]

1 to 4, FIG. 9, and FIG. 10 respectively show a joint according to a first embodiment of the present invention, and FIG. 1 is a longitudinal cross-sectional view of a tubular joint main body constituting the joint;
Figure 2 is a side view showing one side of the intermediate joint, which is another component, Figure 3 is a side view of the flexible pipe in which the joint is used, and Figure 4 is a longitudinal cross-section showing the flexible pipe and the pipe connected. A top view, FIG. 9 is a vertical cross section showing the state before the flexible tube is covered over the tubular joint body, and FIG. 10 is a vertical cross section showing the state after the tubular joint body is covered with the flexible pipe.
5 to 8 show a joint according to a second embodiment of the present invention, in which FIG. 5 is a longitudinal cross-sectional view of the tubular joint main body constituting the joint, and FIG. 6 is a middle section showing other components. FIG. 7 is a side view showing one side of the joint, and FIG. 8 is a side view of the flexible pipe in which the joint is used.
The figure is a longitudinal sectional view showing a state in which a flexible pipe and a pipe are connected. 1, 5...Tubular joint body, 2, 2', 6, 6'...
...Intermediate joint part, 3,7...Flexible pipe, 4...
...Pipe, 21, 31, 61, 71... Projection, 2
2, 32, 62, 72... groove.

Claims (1)

[Claims for Utility Model Registration] A joint that is connected to a flexible pipe that has grooves and protrusions that extend continuously or circularly around the outer circumferential surface, and that substantially corresponds to the outer circumferential shape of the flexible pipe and that extends from one end to the other end. The flexible tube has an inner circumferential surface whose inner diameter decreases toward the outer circumference and an outer circumferential surface whose diameter is approximately constant, is made of a material with lower rigidity than the flexible tube, is divided into at least two parts along the axial direction, and is coated on the outer circumference of the flexible tube. an intermediate joint part formed of a material more rigid than the flexible pipe, and having a joint hole at one end having a substantially constant diameter on the inner circumferential surface into which the intermediate joint part covered by the flexible pipe is inserted; and a tubular joint body having a joint hole at the other end into which a pipe is inserted.