JPS6119266Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a sleeve type adhesive joint device.

Generally, as shown in Fig. 1, when a socket 3 (usually a JISB2301 threaded malleable cast iron pipe fitting, etc.) is used to connect steel pipes 1 and 2, the bending angle θ at the time of leakage is It is about 4 degrees or less (depending on the pipe diameter). Incidentally, reference numerals 4 and 5 in the figure are frames, and arrow A indicates the direction of the load.

As a method for further increasing the above-mentioned bending angle θ, that is, improving the bending deformation, the method shown in FIG. 2 can be considered. In Fig. 2, 1 and 2 are steel pipes to be connected to each other, and near the tips of these steel pipes 1 and 2, male threads 6 and 7 are provided, respectively, with diameters decreasing in the direction of the pipe. . Reference numeral 8 denotes a sleeve type joint, which has female threads 9 and 10 that can be screwed into the male threads 6 and 7, respectively. 11,
Reference numeral 12 denotes an adhesive, which is inserted between the threaded portion of the male threads 6, 7 and the female threads 9, 10, the subsequent inner wall of the open end side of the sleeve type joint 8, and the outer wall of the steel pipes 1, 2. ing.

In the case shown in FIG. 2, the bending angle described above is large, and deformation of several tens of degrees is possible.

By the way, in the sleeve type adhesive joint device shown in FIG. 2, when assembling it, the broken line 1 in FIG.
As shown at 3 and 14, the adhesives 11 and 12 overflow into the pipe of the sleeve-type joint 8, resulting in a decrease in the cross-sectional area of the pipe, increasing flow resistance and reducing the flow rate.

SUMMARY OF THE INVENTION An object of the present invention is to provide a sleeve-type adhesive joint device that eliminates the above-mentioned drawbacks and prevents adhesive from overflowing into the tube of the sleeve-type joint.

The present invention has been made to achieve the above-mentioned purpose, and is provided in the vicinity of the tips of two steel pipes to be connected, and can be screwed with a male screw whose diameter decreases in the direction toward the tips. A sleeve-type joint having separate female threads is provided, and an adhesive is inserted into the threaded portion between the male thread and the female thread and the subsequent portion between the inner wall on the open end side of the sleeve-type joint and the outer wall of the steel pipe. The sleeve-type adhesive joint device has a bent part in the center that can absorb displacement in the axial direction, and separate tapered parts whose diameter gradually decreases from the center toward both ends. is formed, and the outer diameter of the above-mentioned both ends is smaller than the inner diameter of the above-mentioned steel pipe, and the outer diameter of the above-mentioned center vicinity of the above-mentioned taper part is provided with a cylindrical inner tube formed to have a larger diameter than the inner diameter of the above-mentioned steel pipe, A sleeve type adhesive joint device in which the tapered part of the cylindrical inner pipe is fitted to the steel pipe so that the adhesive leaking from the threaded part to the center side of the sleeve type joint is received by the cylindrical inner pipe. This is what we provide.

An embodiment of the present invention will be described in detail below with reference to FIGS. 3 to 8. FIG. 3 shows the assembled state of the sleeve type adhesive joint device of the present invention, and the same reference numerals as in FIG. 2 indicate the same elements. Reference numeral 15 is a cylindrical inner tube made of, for example, synthetic resin or rubber, and as shown separately in FIGS. 4 and 5, there is a bent part 16 in the center with a U-shaped cross section that can absorb displacement in the axial direction. , and separate tapered portions 19 and 20 each having a smaller diameter from the center toward both ends 17 and 18 are provided. The outer diameters of both end portions 17 and 18 are smaller than the inner diameters of the steel pipes 1 and 2, and the outer diameters of the tapered portions 19 and 20 near the center are larger than the inner diameters of the steel pipes 1 and 2. It is formed.

When assembling the sleeve type adhesive joint device shown in FIG. 3 above, first insert the cylindrical inner pipe 15 inside one of the steel pipes 1 as shown in FIG. 6, and then as shown in FIG. , an adhesive 11 is applied to the male thread 6 of the steel pipe 1 described above and the inner wall of the sleeve type joint 8 described above.
8, and the male thread 6 and the female thread 9 of the sleeve type joint 8 are screwed together, as shown in FIG. next,
Adhesive 12 is applied to the male thread 7 of the other steel pipe 2 and the inner wall of the sleeve type joint 8, and the male thread 7 and the female thread 10 are screwed together as shown in FIG. The adhesives 11 and 12 overflowing due to the screw engagement between the male threads 6 and 7 and the female threads 9 and 10 enter between the cylindrical inner pipe 15 and the sleeve-type joint 8, as shown by reference numerals 21 and 22, and therefore enter the inside of the pipe. It does not enter the pipe, and the internal cross-sectional area of the pipe does not decrease as described above.

As mentioned above, the cylindrical inner tube 15 inserted into the steel pipes 1 and 2 has its tapered portions 19 and 20
Since this abutting portion is pressed and tightly contacted by the elasticity of the bent portion 16 of the cylindrical inner tube 15, leakage of the adhesives 11 and 12 into the tube can be sufficiently prevented. Further, due to the elasticity (contraction in the axial direction) of the bent portion 16, the steel pipes 1, 2 and the sleeve type joint 8 are screwed together with the tapered portions 19, 20 in contact with the ends of the steel pipes 1, 2. Allows for relative rotation. The tapered portions 19 and 20 are provided to absorb manufacturing tolerances in the inner diameters of the steel pipes 1 and 2 and to facilitate insertion into the steel pipes 1 and 2.

Therefore, by using the above-mentioned cylindrical inner tube 15, the end surfaces of the steel tubes 1 and 2 can also be protected from corrosion. That is, in the conventional water pipe shown in FIG.
The end face of the pipe is corroded (the corroded parts are indicated by circles 23 and 24), and for this reason, it was necessary to apply an anticorrosive agent when fitting water pipes. By using this, the work of applying the above-mentioned anticorrosive agent can be made unnecessary.
In FIG. 9, reference numeral 25 is the socket described above, and 26 is an anti-corrosion layer applied to the outer and inner surfaces of the steel pipes 1 and 2.

As is clear from the above description, the present invention provides a sleeve-type adhesive joint device that prevents the adhesive from overflowing into the pipe and narrowing the internal cross section of the pipe when adhesive is inserted into the joint during assembly. There is a remarkable effect that can be obtained.

[Brief explanation of the drawing]

1 and 2 are for explaining the present invention. FIG. 1 is a configuration diagram for explaining bending deformation, and FIG. 2 is an assembled diagram with a part cut away.
3 to 8 show an embodiment of the present invention, in which FIG. 3 is a partially cutaway front view showing the assembled state, FIG. 4 is a partially cutaway front view of the main part, and FIG. 5 is a partially cutaway front view of the main part. is a side view of the one shown in FIG. 4, and FIGS. 6 to 8 are partially cutaway front views showing the assembly process. FIG. 9 is a partially cutaway front view showing a conventional example. 1, 2... Steel pipe, 6, 7... Male thread, 8... Sleeve type joint, 9, 10... Female thread, 11, 12
... Adhesive, 15 ... Cylindrical inner tube, 16 ... Bent part, 17, 18 ... End part, 19, 20 ... Taper part.

Claims (1)

[Scope of utility model registration request] A sleeve type joint is provided near the tips of two steel pipes to be connected, each having a male thread whose diameter decreases in the direction toward the tips and a separate female thread that can be screwed into the sleeve, and the male thread and the female thread are connected to each other. In the sleeve-type adhesive joint device, an adhesive is inserted into the threaded part between the sleeve-type joint and the subsequent part between the inner wall on the open end side of the sleeve-type joint and the outer wall of the steel pipe. It has a bent part that can absorb the displacement of the steel pipe, and separate tapered parts are formed that gradually become smaller in diameter from the center toward both ends, and the outer diameter of the above-mentioned both ends is smaller than the inner diameter of the steel pipe. A cylindrical inner tube is formed to have a small diameter and an outer diameter near the center of the tapered portion is larger than the inner diameter of the steel tube, and the tapered portion of the cylindrical inner tube is fitted into the steel tube. A sleeve-type adhesive joint device, characterized in that the cylindrical inner tube receives adhesive leaking from the above-mentioned threaded portion to the center side of the sleeve-type joint.