JPS5926687A - Slip-off preventive device for pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pipe removal prevention device, and more particularly to a combustion gas exhaust pipe of a combustion appliance (two preferred means).

The exhaust pipe of a combustion appliance is a thin-walled pipe, and the lid trachea is connected by inserting one pipe (inner pipe) into the other pipe (outer pipe), and the seal at the connection part is Expand the outer tube and place the O-ring.

As a means for preventing the tube from slipping out, an outwardly bulging portion is provided on the inner tube side as well, and a metal fitting that narrows from the Z-axis direction is attached to the bulging portion of the inner and outer tubes. In this case, two operations are required: inserting the inner tube into the outer tube and attaching the metal fittings to prevent the inner tube from coming out. Therefore, it is possible that the user forgets to attach the metal fittings, and in that case, the connection may become disconnected.

Further, as a means for preventing the tube from coming off, it is conceivable to provide a pawl on one tube and engage the bulging portion of the other tube to prevent the tube from coming off, but this requires the attachment of the pawl.

The purpose of the present invention is to have a structure in which the inner tube can be prevented from coming out by simply inserting it into the outer tube, and no other parts are required! There are two things to offer.

In the present invention, a groove Z for an O-ring for sealing is provided in the outer tube, and a groove is also provided in the inner tube. When you go down to pull out the tube, the O-ring is located between the end of the groove on the end side of the outer tube and the end of the groove on the end side of the inner tube, and this prevents it from being pulled out. (Ni, reverse (: Inner tube! When inserting, the O-ring is moved into the groove of the outer tube by the tapered surface of the groove of the inner tube, and the inner tube is C-shaped so that it can be inserted.

An embodiment of the present invention will be described below with reference to FIG. 1 is the outer tube, and the end portion (1 groove 2 is provided).

The groove 2 is formed by protruding semicircularly toward the outside of the tube wall so as to be perpendicular to the axial direction C2 of the tube.

Reference numeral 3 designates an inner tube, the outer diameter of which is large enough to be slid into the outer tube 1, and is provided with a double layer 4 at the end C. This groove 4 is formed in the inner tube. Semicircular inwardly and tapered in the extending direction (i.e., opposite end side) 4
It is configured to bulge out so that it becomes a. Also @ of groove 4
The end side 4b is not tapered, but is formed so that it has two surfaces that are orthogonal to each other as much as possible in the axial direction.
The connection portion between the outer surface 3b and the outer surface 3b is provided in an etched shape as much as possible.

The distal end 3a of the inner tube 30 is tapered, and its tip end diameter is smaller than the root diameter of the groove 4. 5 is an O-ring that is attached to the groove 2 of the outer tube 1.

In the open state, the O-ring 5 has an inner diameter equivalent to the root diameter of the groove 4, and its center diameter is equal to the inner diameter of the outer tube 1 and the inner diameter of the inner tube 3.
approximately equal to the outer diameter of The inner diameter of the groove 2 of the outer tube 1 is large enough to be sealed by the outer surface 3c of the inner tube 3 and the O-ring 5. Further, the width of the groove 2 is approximately the same as or larger than the diameter of the O-ring 5, and is large enough to allow the O-ring 5 to move in the radial direction.

Explain the assembly order. First, the O-ring 5 is placed in the groove 2C of the outer tube 1. When the inner tube 3 is inserted in this state, the O-ring 5 is expanded by the tapered surface (-) of the tip 3a of the inner tube 3, and It enters the groove 2. Therefore, the inner tube 3Z and C
Two can be inserted, and the O-ring 5 is outside.

It passes through the surface 3b7 and enters the groove 4, resulting in the second cause state.

Inner tube 3'! a:' If the inserter is further inserted, the O-ring 5 will be expanded by the tapered surface 4al2, resulting in the state shown in FIG. In this state, the O-ring 5 is in close contact with the groove 2 of the outer tube 1 and the outer surface 3C of the inner tube 30, creating a seal. Moreover, the length of the tube can be changed as required.

Next (when inner tube 3 is removed from the state of 1st brother 3 causes, state C in Figure 2
Two. In this state, O-ring 5 is shrinking, so
The O-ring 5 comes into contact with the end side 2a of the groove 2 and the end side 4b of the groove portion 4, and is in a state of being sheared.

Therefore, the inner tube 3 cannot be pulled out any further, and is prevented from being pulled out.

In this case, it is necessary that the connection between the outer surface 3b and the end side 4b of the groove 4 be as etched as possible, and that the end side 4b have a surface as perpendicular to the axial direction as possible.

In the above embodiment, the end side 2a of the groove 2 is perpendicular to the axial direction, but the outside may be tapered. In this case, the O-ring 5 becomes ζ2 so that it is reduced, and 0
Unless the outer diameter of the ring 5 becomes smaller than the inner diameter of the outer tube 1, it will not come off.

In addition, in order to perform sealing in the state shown in Fig. 2 (- indicates the width of groove 2 and the diameter of the groove 4), the width of groove 2 and the diameter of groove 4 should be appropriately designed so as to contact the core (
Two.

Further, even if the root diameter of the groove 4 is sufficiently smaller than the inner diameter of the O-ring 5, it is possible to prevent the groove from slipping out. The minimum diameter of the leading edge 3a is 0
The ring 5Z is expanded to a size that allows the inner tube 3 to be inserted therein.

As described above, the present invention is provided with an outer groove recessed outward, and the axial width of the layer is such that the 0 ring can be moved in the radial direction; The inner tube is provided with a groove that can be sealed by the outer surface excluding the groove and an O-ring, the inner diameter of which is smaller than the outer diameter of the O-ring on the end side of the groove of the outer tube, and the inner tube is recessed inward. A tapered portion with a smaller diameter tip is provided on the end side of the inner tube than the inner tube, and the opposite end side of the layer is provided in a tapered shape, and the outer diameter on the end side of the layer is larger than the inner diameter of the O-ring,
The connection part between the end side of the layer and the end side of the inner tube is etched (two are provided, and the end side of the layer and the end side of the groove of the outer tube are connected by C2).
C so that the ring is held within the space defined by the two grooves.
Since it can be split into two parts, the inner tube 7 and the outer tube (
It is secured by just two insertions and down.

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of the pipe removal prevention device of the present invention. Fig. 1 is a longitudinal cross-sectional view of the pipes in a connected state, and Fig. 2 is a longitudinal cross-sectional view of the pipes in a state in which the pipes are combined and made the longest. Figure 3 is a vertical cross-sectional view of the tubes combined and shortened, and Figure 4 is an enlargement of section A in Figure 2. 1...Outer tube 2...Groove 2a. ...End side of groove 2 3...Inner pipe 3a...
Tip 4... Groove 4a... Opposite end side of the groove 4C... End side of the groove 5... 0 ring, 7, half 1n, 2 figures

Claims (1)

[Claims] 1 Consisting of an outer tube, an inner tube inserted into the outer tube, and an O-ring located between the outer tube and the inner tube, an outwardly recessed groove is provided in the outer tube so that the axis of the groove The width in this direction is set so that the O-ring can be moved in the radial direction, and the inner diameter of the groove is set so that it can be sealed by the O-ring and the outer surface of the inner tube excluding the groove described later. To make the inner diameter smaller than the outer diameter of the O-ring and to provide an inwardly recessed groove in the inner tube, a tapered part with a small diameter tip is provided on the end side of the inner tube than the groove, and the groove is recessed inward. The end side is tapered, and the outer diameter of the end side of the groove is set larger than the inner diameter of the O-ring, so that the connection between the end side of the groove and the end side of the inner tube is A pipe retainer, characterized in that the O-ring is held in the space defined by the two grooves by the end side of the groove and the end side of the groove of the outer tube. Device.