JPS5910471Y2 - Connection device between headless pipe and flange pipe - Google Patents

Description

[Detailed description of the invention] This invention relates to a connection device between a headless pipe and a flange pipe.

Generally, it is difficult to connect a headless pipe and a flange pipe, so if the headless pipe is made of a weldable material such as steel, welding a flange to the end of the pipe or Alternatively, a thread may be cut at the end of the tube and a flange may be fitted with a screw, but this process is naturally time-consuming.

Furthermore, it is impossible to weld or twist the cast iron pipes that are currently widely used for water pipes, etc., and joining them requires a great deal of cost and time.

That is, when attempting to install a water control valve in the middle of a pipe that has already been installed, conventionally the method shown in FIG. 4 was used to connect it.

For example, when inserting a water control valve b in the middle of an existing pipe a, cut and remove the middle part of the existing pipe a to a length d that is much longer than the flange spacing C of the water control valve b, and add a flange e at one end. death,
In addition, a short pipe g having a socket f on the other end that fits into the headless pipe part of the existing pipe a, a headless joint pipe i having a flange n at one end, a joint ring k having sockets j at both ends, and the same. The water use valve B was inserted in the middle of the existing pipe A using many materials such as rubber packing and bolts attached to the pipe.

As described above, the conventional method requires a large number of joints, and at the same time, in the case of underground installation, the cutting dimension d of the existing pipe a must be excavated to be larger than the dimension C between the flanges at both ends of the water control valve b. The cut portions on both sides had to be sufficiently exposed, and this excavation required a great deal of labor and time and was very uneconomical.

This invention was developed to improve and eliminate the above-mentioned drawbacks of the conventional method, by reducing the cutting dimensions of the existing pipe as much as possible, and reducing the labor and time required to excavate and expose the water utilization valve insertion part of the existing pipe. The purpose of the present invention is to provide a device that can significantly reduce the amount of damage caused by water control, reduce the number of joints, and quickly and inexpensively insert a water control valve into the middle of existing piping. It is as follows.

In Figures 1 to 3, 1 is an existing water pipe, 2 is a water control valve, and 3 is a stepped portion 8 on the outer circumferential surface to form two stepped tapers 4/, 4// of the same angle. The sleeve has a wedge-shaped cross section with a large diameter portion and a flange 10, and is made of an elastic material such as rubber or plastic.

This sleeve 3 is fitted onto the headless tube 1 with the flange 10 facing toward the cut end of the headless tube 1.

Reference numeral 5 denotes a pressing ring having an L-shaped cross section, and its inner peripheral surface is provided with two large and small tapers 6' and 6'' that almost match the two large and small tapers 4 and 4 of the sleeve 3.

Of the two large and small tapers 67, 5// of this press ring 5, the length in the tube axis direction of the large diameter side taper surface 6'' is longer than the tube axis direction length of the large diameter side taper surface 4' of the sleeve 3. It is made slightly shorter to form a tightening gap in the tube axis direction between the outer end surface of the flange of the pressing ring 5 and the inner end surface of the flange 10 of the sleeve 3.

7 is a tightening rod that tightens the press ring 5 and the flange 2' of the water control valve 2.

The above-mentioned construction equipment will be implemented as follows.

In other words, as shown in FIG.
, Cut it slightly longer than the 2' plane spacing and remove it.

Thereafter, the press ring 5 and the sleeve 3 are fitted into the headless pipe portions at both ends of the cut portion of the water pipe 1 from their free ends, respectively, as shown in FIG. 2.

After that, the water utilization valve 2 is inserted between the cut parts of the water pipe 1 as shown in FIG. 1, and the sleeve 3 is slid onto the end of the headless pipe 1 as shown in FIG. A pressing ring 5 is fitted onto the two-step large and small taper 4/, 4// on the outer circumferential surface of the press ring 5.

Thereafter, the pressing ring 5 and the flange 2' of the water control valve 2 are tightened using the tightening rod 7.

Then, the taper 6'' on the small diameter side of the pressing ring 5 comes into close contact with the taper 4'' on the small diameter side of the sleeve 3, and strongly presses the sleeve 3 in the radial direction.

Then, the stepped portion 9 of the pressing ring 5 is inserted into the sleeve 3 as shown in FIG.
When the sleeve 3 is engaged with the stepped portion 3, the sleeve 3 is compressed in the axial direction together with the tightening movement of the pressing ring 5, and its front surface is strongly pressed against the flange 2' of the water utilization valve 2 as shown in Fig. 3. .

At the same time, the large diameter taper 4' of the sleeve 3 is strongly pressed in the radial direction by the large diameter taper 6' of the pressing ring 5.
It comes into close contact with the outer periphery of the headless tube 1.

In short, the step part 9 of the pressure ring 5 engages with the step part 8 of the sleeve 3, so that the sleeve 3 is forcibly compressed in the axial direction, and the flange 2' of the water control valve 2 and the pressure ring 6 form a sleeve. The flange 10 at the large diameter end of No. 3 is strongly pressed.

Therefore, the watertight effect of this part is further increased, preventing water leakage, and strong pressure is applied in the radial direction, preventing water from leaking between the headless pipe 1 and the sleeve 3. Moreover, the headless pipe 1 can be removed. When attempting to do so, the sleeve 3 wedges into the pressing ring 5 more and more tightly, tightly holding the headless tube 1.
It is possible to securely prevent it from coming off.

As mentioned above, the present invention involves pressing a pressure ring on a headless tube and a flange tube with a sleeve made of an elastic material between them, and using multiple tightening rods at evenly spaced positions on the circumference of the tube. In a device for tightening the connection in the direction, the inner diameter surface matches the outer diameter surface of the headless tube and has a uniform diameter in the axial direction, and a stepped portion 8 is provided in the middle of the outer diameter surface, and both sides of this stepped portion The sleeve is made of an elastic material and has a wedge-shaped cross-section, which has two steps of tapered surfaces of the same angle in a step-like shape in the axial direction, and also has a flange extending outward toward the outside diameter at the large diameter end. , the inner diameter surface has a step-like tapered surface of two steps, large and small, which coincides with the two steps of large and small steps of the outer diameter of the sleeve, and has a step portion 9 in the middle, and The axial length of the tapered surface is the step part 8 of the sleeve.
The length in the axial direction of the tapered surface on the larger diameter side is slightly shorter than that of the tapered surface on the larger diameter side, and a flange portion that matches the flange of the flange pipe is formed on the outer diameter surface of the larger diameter end of the tapered surface on the larger diameter side. It consists of a pressing ring with an L-shaped cross section, in which the insertion holes of the attachment rods are equally spaced around the circumference and parallel to the tube axis, and the pressing ring and the sleeve are arranged with the large diameter end of their tapered surfaces facing the tube end. and insert it onto the headless pipe, and fit the step-like tapered surface of the inner diameter of the press ring to the step-like taper surface of the outer diameter of the sleeve, and support the flange of the sleeve between the press ring and the flange pipe. Since the pipe is tightened in the axial direction using a tightening rod,
By tightening the press ring 5 and the flange 2' of the water control valve 2 in the pipe axial direction with the tightening rod 7, there is a gap between the outer end surface of the press ring 5 and the inner end surface of the flange 10 of the sleeve 3. The difference between the lengths of the large-diameter tapered surfaces of the two creates a tightening margin for compressing the sleeve 3 in the tube axis direction, and the two large and small tapers 4/, 4/l on the inner surface of the pressing ring 5 form the outer surface of the sleeve 3. The sleeve 3 tightly engages with the two steps of large and small tapers 6/, 6// to tighten the diameter of the sleeve 3 firmly on the outer peripheral surface of the headless tube 1, and at the same time, the presence of the stepped portion prevents the axial movement of the snob. The flange 10 of the sleeve is tightly compressed and brought into close contact with the flange 2' surface of the water control valve 2 by the flange of the pressure ring 5 to enhance the water retention effect, and at the same time, as a compression reaction force of the sleeve in the direction of the pipe axis. sleeve 3
The sleeve 3 is compressed into close contact with the outer surface of the headless tube 1, thereby increasing the watertight effect, thereby ensuring water leakage prevention and preventing the headless tube from slipping out. .

[Brief explanation of the drawing]

The drawings are explanatory diagrams of the headless pipe connection device according to this invention, and FIG. 1 is an overall view of a state in which a water control valve is inserted into a part of a water pipe using the device of this invention. FIGS. 2 and 3 are longitudinal sectional views of the connection part, and the second
The figure shows the state before connection, FIG. 3 shows the state after connection, and FIG. 4 is an explanatory diagram of a conventional connection method. 1... Headless pipe, 2... Water control valve, 2'.
...Flange, 3...Sleeve, 4',
4”...Two steps of large and small taper 5...
Pressing ring, 6/, 5//... double taper,
7...Tightening rod, 8...Step part, 9...
...Danbe, 10...Tsubabe.

Claims (1)

[Scope of utility model registration request] In a device that tightens and connects a pressure ring on a headless pipe and a flange pipe in the pipe axial direction with a plurality of tightening rods at equidistant positions on the circumference by sandwiching a sleeve made of an elastic material between them. , has an inner diameter surface that coincides with the outer diameter surface of the headless tube and has a uniform diameter in the axial direction, and a step 8 is provided in the middle of the outer diameter surface, and this step has two large and small steps of the same angle on both sides. A sleeve made of an elastic material and having a wedge-shaped cross section, the tapered surface of which has a step-like shape in the axial direction, and a flange that protrudes toward the outside diameter at the large diameter end; The inner diameter surface has a stepped taper surface of two steps, large and small, with a step 9 in the middle, and the axial length of the tapered surface on the larger diameter side than the step 9. is slightly shorter than the axial length of the tapered surface on the larger diameter side than the stepped portion 8 of the sleeve, and a flange portion that matches the flange of the flange pipe is formed on the outer diameter surface of the larger diameter end of the larger diameter tapered surface. At the same time, this flange part is made up of a pressing ring with an L-shaped cross section, in which the insertion holes for the tightening rods are arranged at equal positions on the circumference and parallel to the tube axis, and the pressing ring and the sleeve are connected to each other by the large diameter of their tapered surfaces. The sleeve is inserted into a headless tube with the radial end facing the tube end, and the step-like tapered surface on the inner diameter of the press ring is fitted into the step-like taper surface on the outer diameter of the sleeve, and the press ring and flange pipe are interposed therebetween. A connection device for a headless pipe and a flange pipe, characterized in that the flange of the sleeve is held and tightened in the pipe axial direction with a tightening rod.