JPH022149Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the connection structure of various types of piping such as the supply and exhaust pipes of water heaters. After engagement through the hole, a partially cut-out elastic tightening ring is fitted between the engagement ribs to prevent the piping from rotating and the boss from coming off. It is an object of the present invention to provide a piping connection structure that can prevent disconnection and prevent leakage of exhaust gas, etc.

As a conventional connection means for this type of piping, one of the insertion portions at both ends of the piping is provided with a concave portion that bulges in the axial and circumferential directions, and an engaging convex portion is provided on the other side, and the convex portion is engaged with the concave portion. There are some types that are designed to prevent them from coming off by rotating them later, but in some cases, when installing several pipes in a row, or if they are rotated carelessly after assembly, the engaging protrusion may not move in the axial direction. There were problems such as the engagement protrusion sometimes coming off due to alignment with the recess.

This idea was designed to solve the above-mentioned conventional problems, and the connecting parts at both ends of the pipe were made with large and small diameters so that they could be fitted together, and the connecting parts on the large diameter side had two parts near the end and the center. The engagement rib portions of the rows are formed to bulge at predetermined intervals, and a notch hole is provided in the axial direction from the end to the center-side engagement rib portion, and the connection portion on the small diameter side is engaged through the center-side engagement rib portion. A boss part that can be inserted and locked into the rib part is formed, and after the boss part of the connecting part of the pipe that is connected to the centrally located engaging rib part of the large diameter side connecting part of the pipe is engaged through the notch hole, the engaging rib part An elastic tightening ring with a portion cut out in between is fitted across the notch hole to prevent both pipes from turning and preventing them from coming off, and even if they rotate, the boss will not come off. This invention relates to the invention of a pipe connection structure that uses an elastic fastening ring to prevent the piping from slipping out of the engaging rib portion, thereby ensuring that both pipes are prevented from coming off, simplifying the connection structure of the pipe connection, and also maintaining airtightness. .

This invention will be explained below based on embodiments shown in the drawings.

In the embodiment shown in FIGS. 1 to 6, one connecting portion 1a of the pipe 1 is made slightly larger in diameter than the other connecting portion 1b so that they can be fitted together, and one connecting portion 1a has an end portion and an end portion. Two rows of engaging rib portions 2 and 3 are bulged near the center at a predetermined interval suitable for fitting a retaining elastic tightening ring 6, which will be described later.
In addition, a sealing rib part 4 is formed at an appropriate position closer to the center than the engaging rib part 3, and the second row of the engaging rib part 3 is used for engaging a boss part 8 to be described later, and the sealing rib part 4 is used for engaging a boss part 8 to be described later. The boss portion 8 (described later) extends axially into the rib portion 3.
A notch hole 5 is provided in which the ribs 2 and 3 are inserted, and a portion of the outer periphery between the rib portions 2 and 3 of the first and second rows is cut out, and a retaining elastic ring 6 having a notch 6a is cut out using elasticity. Connecting portion 1a by fitting across hole 5
and prevents the boss portion 8 from coming off.
The sealing rib portion 4 also has a sealing O.
The ring 7 is inserted to tightly fit the small-diameter connecting portion 1b into the large-diameter connecting portion 1a to maintain airtightness.
A boss portion 8 that engages into the engaging rib portion 3 through the rib portion 3 is provided to protrude slightly. Therefore, when connecting the connecting parts of the pipes 1 and 1, the boss part 8 is fitted into the engaging rib part 3 through the notch hole 5 and rotated, and the elastic tightening ring 6 for preventing slipping is inserted between the rib parts 2 and 3. Even if the boss portion 8 tries to return through the notch hole 5 by fitting it across the notch hole 5, the elastic tightening ring 6 prevents it from coming off.
Make sure that it does not come off if you hit it. That is, piping 1
When connecting the pipes 1 to 1, align the boss part 8 of one pipe 1 with the notch hole 5 of the pipe 1 to be connected as shown in FIG. (the position of the engaging rib 3), and at that position, rotate it along the circumference inside the engaging rib part 3 to engage the engaging rib part 3, and then as shown in FIGS. 4 and 5. A retaining elastic tightening ring 6 shown in FIG. 6 is fitted between the rib portions 2 and 3, and is tightened and fixed in a state where it traverses the outer periphery of the notch hole 5.

According to this invention described above, the boss portion of the piping is inserted into the engaging rib portion through the notched hole of the piping connecting it, and is rotated to engage the engaging rib portion, and the elastic tightening ring for preventing slipping is inserted through the notched hole between the engaging rib portions. Since the connection part can be tightened and held with a simple structure that is fitted across, the piping is difficult to rotate, and even if the boss part matches the notch hole after installation, the boss part can be caught by the elastic ring to prevent it from coming off, so the boss part will not rotate. There is no risk of it coming off and disconnecting the piping. Since the engagement between the boss portion and the notch hole is easy to see, this has the effect of making it easy to confirm the state of engagement.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view showing an embodiment of the pipe connection structure of this invention in a connected state, Figs. 2 to 4 are plan views showing the order in which the pipes are connected, and Fig. 5 is an elastic tightening ring portion for preventing the pipes from coming off. FIG. 6 is a perspective view of the elastic tightening ring for preventing slippage. 1...Piping, 1a...Large diameter side connection part, 1b...
... Connection part on the small diameter side, 2, 3 ... Engagement rib part, 4 ...
... Rib portion for sealing, 5 ... Notch hole, 6 ... Elastic tightening ring for preventing removal, 8 ... Boss portion.

Claims (1)

[Scope of utility model registration request] The connecting portions at both ends of the pipe 1 are made with large and small diameters so that they can be fitted to each other, and the connecting portion 1a on the large diameter side has two rows of engaging rib portions 2 and 3 at the ends and near the center at a predetermined interval. While forming a bulge, a notch hole 5 is provided in the axial direction from the end portion to the center-side engaging rib portion 3, and the connecting portion 1b on the small diameter side is inserted and locked into the center-side engaging rib 3 through the notch hole 5. After providing a flexible boss part 8 and locking the boss part 8 of the connecting part 1b of the pipe 1 that connects to the engaging rib part 3 of the connecting part 1a of the pipe 1, a part is cut out between the engaging rib parts 2 and 3. A piping connection structure characterized in that an elastic tightening ring 6 is fitted across the cutout hole 5.