JPH029189Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a structure for attaching a flange to the outer peripheral surface of a pipe.

[Conventional technology]

1 and 2 show an example of a conventional flanged pipe.

The horizontal end 1a of the L-shaped pipe 1 is inserted into the hole of the flange 2, and then fixed to the flange 2 in a manner described later.

The horizontal end 1a of the pipe 1 protruding from the inner surface 2a of the flange 2 is inserted into the hole 3a provided in the wall 3, and the pipe is tightened by tightening the bolts 5 inserted into the plurality of mounting holes 4 provided in the flange 2. 1 is
It is attached to the wall 3.

In order to easily attach the flange 2 to the horizontal end 1a of the pipe 1 without welding or screwing, a configuration as shown in FIG. 3 is known.

In FIG. 3, a hole 2 drilled in a flange 2
A plurality of annular grooves 6 perpendicular to the axis are provided on the inner circumferential surface of b.
are carved at a certain pitch. With the horizontal end 1a of the pipe 1 inserted into the hole 2b, a punch 7 having an outer diameter slightly larger than the inner diameter of the horizontal end 1a is inserted into the horizontal end 1a.

Then, the horizontal end portion 1a of the pipe 1 is plastically deformed and expanded in diameter, a protruding ring 8 is formed in the annular groove 6 portion of the flange 2, and the flange 2 is fixed to the pipe 1.

At this time, since each protruding ring 8 is strongly pressed against the edge of the annular groove 6, the fitting portion between the horizontal end 1a of the pipe 1 and the flange 2 is in a sealed state.

In another mounting structure shown in FIG. 4, in order to prevent relative rotation between the horizontal end 1a of the pipe 1 and the flange 9, a plurality of straight lines parallel to the axis are provided on the inner peripheral surface of the flange 9. A groove 11 is carved.

When the punch 7 is pushed into the pipe 1 inserted into the flange 9, an axial protrusion (not shown) is formed on the outer periphery of the pipe 1 at the linear groove 11 portion, and this protrusion and the linear groove The flange 9 is attached to the pipe 1 by the strong pressure contact with the pipe 11.

[Problem that the invention attempts to solve]

In any of the above systems, when an external force or vibration as shown by the arrows in Figs. 1 and 2 acts on the vertical part of the pipe 1 depending on the usage condition of the pipe 1, the horizontal part of the pipe 1 will have an axial line. A force around it or a force that tends to tilt its axis acts.

Due to the action of this external force, the pressure contact part between the protruding ring 8 of the pipe 1 and the annular groove 6 of the flange 2 is worn out, creating a gap in the fitting part, and the horizontal part of the pipe 1 is axially, circumferentially, or radially This causes directional play and the sealing effect at the fitting portion is lost. If this sealing effect is lost, the fluid inside the wall 3 will leak as shown by the arrow in FIG. 3.

[Means for solving problems]

According to the present invention, the above problem can be solved by inserting a pipe into a hole in the flange in which an annular groove is cut at a certain pitch, and inserting a punch having an outer diameter slightly larger than the inner diameter of the pipe into the pipe. By inserting it into the pipe and forming a protruding ring on the outer periphery of the pipe that protrudes into the annular groove of the flange,
In a flange to be attached to a pipe, annular grooves that are inclined at an appropriate angle to the end surface of the flange and parallel to each other are carved at a constant pitch on the inner peripheral surface of the hole in the flange, and these annular grooves are This problem is solved by making at least one of the flange parts continuous and not cut at the end face of the flange.

〔Example〕

In FIG. 5, a plurality of annular grooves 13, which are inclined at an appropriate angle with respect to the end surface of the flange 12 and parallel to each other, are carved at a constant pitch on the inner circumferential surface 12a of the hole in the flange 12. ing.

The annular groove 13 that intersects with the end surfaces 12b and 12c of the flange 12 is partially cut off, but
There is at least one completely continuous annular groove 13 that is not cut by the end faces 12b, 12c of the flange 12.

After inserting the pipe 1 into the hole in the flange 12, when the punch 7 is pushed into the pipe 1,
A protruding ring 1 that fits into the annular groove 13 on the outer periphery of the pipe 1
4 is formed, and the flange 12 is attached to the pipe 1 in a sealed manner.

[Effect of idea]

Since the flange is attached to the pipe using the inclined annular groove in the hole in the flange, the pipe does not rotate around the axis of the hole in the flange or move in the axial direction.

Moreover, since the annular groove in the hole in the flange is inclined, the contact area between it and the protruding ring in the pipe is larger than in the conventional one shown in Fig. 3, and the connection and sealing of the two is better than in the conventional one. In addition to being more reliable than pipes, they also have greater resistance to the tendency of the pipe to tilt its axis.

In addition, since at least one completely continuous annular groove exists on the inner periphery of the flange, the sealing effect at the attachment portion of the pipe and flange is reliably maintained.

[Brief explanation of drawings]

FIG. 1 is a front view illustrating a conventional flanged pipe, FIG. 2 is a right side view, and FIG.
FIG. 4 is a vertical side view showing another example of the conventional flange mounting structure, and FIG. 5 is a flange mounting structure showing an embodiment of the present invention. FIG. 1...pipe, 2...flange, 3...wall,
4...Mounting hole, 5...Bolt, 6...Ring groove, 7
...Punch, 8...Protrusion ring, 9...Flange, 11
... Straight groove, 12 ... Flange, 13 ... Annular groove,
14... protruding ring.

Claims (1)

[Scope of utility model registration request] A pipe is inserted into a hole in which an annular groove is carved at a certain pitch in the flange, and a punch having an outer diameter slightly larger than the inner diameter of the pipe is inserted into the pipe to form a punch around the outer circumference of the pipe.
By forming a protruding ring that protrudes into the annular groove of the flange, the annular grooves that are inclined at an appropriate angle with respect to the end face of the flange and parallel to each other can be formed in the flange that is attached to the pipe. A structure for attaching a flange to a pipe, characterized in that the annular grooves are carved at a constant pitch on the inner peripheral surface, and at least one of these annular grooves is continuous without being cut at the end face of the flange.