JPH025184Y2 - - Google Patents

Description

[Detailed description of the invention] ``Purpose of the invention'' The present invention relates to the invention of a telescoping flexible pipe joint, which can effectively follow the cross-sectional shape of the pipes to be connected, and can also smoothly insert and remove the pipes. Another object of the present invention is to provide packing for a flexible pipe joint that is easy to assemble.

Industrial applications A pipe joint that is expandable and flexible.

Conventional technology A packing with a C-shaped cross section is used as a pipe joint for connecting pipe bodies. In other words, the excellent deformability of the packing having a C-shaped cross section and a lumen is used to insert and remove the pipe bodies. The purpose is to form a telescopic relationship and to obtain sufficient flexibility of the connected tube bodies, and its configuration is as shown in FIG. 4. In other words, an annular divided engagement part body 10 in which a packing accommodation part 11 and an engagement part 12 for the connection sleeve are arranged in stages is used, and the end locking part 15 of the cylindrical connection sleeve 14 is attached to the engagement part 12. The packing 16 having a C-shaped cross section is accommodated in the packing accommodating portion 11, one side of which is joined to the outer surface of the tube body 1, and the opening of the C-shaped lumen 16a is connected to the tube body 1. The sealing between the packing 16, the tube body 1, and the locking portion 15 is achieved by applying fluid pressure flowing inside the tube 1 to the C-shaped lumen toward the gap between the packing 16, the tube 1, and the locking portion 15. The bent corner portion 16 in the natural state of the packing 16 (the state taken out from the housing portion 11)
The curvature of c is approximately the same as the curvature of the corner portion 11c of the housing portion 11, and on both sides of the bent corner portion 16c there are also straight flat surfaces 16d, 16d in this natural state as shown in FIG. is provided oppositely. Furthermore, the inner lumen 1 is made with respect to the wall thickness t formed by the outer surface of the packing and the inner lumen 16a near the lip portion that joins the locking portion 15 in the packing 16.
The relationship between the wall thickness W at the inner part of the lumen near the lip portion of the tube 6a that joins with the tube body 1 is W = 1.2t to 1.5t, and the relationship between the width l of the joint surface 23 to the tube body 1 and the thickness The thickness t is about l=2.5 to 3t. In addition, the packing height H of the packing 16 in its natural state is
is approximately equal to the height of the accommodating part 11 described above, and even if the packing is high, it is within 15% of the height of the accommodating part 11.

Problems to be Solved by the Invention It is clear that with the prior art as described above, both the flexibility and elasticity of the connected pipe bodies 1 can be obtained to a certain degree, but the C-shaped packing 16 described above Since the back surface 16b of the packing 16 substantially matches the inner surface shape of the container 11 even in its natural state after being taken out from the container 11, the pressure contact with the surface of the tube body 16 is as shown by the imaginary line in FIG. The inclined joint surface 23 portion is limited to the amount pushed into the flat surface of the tube body 1, and the pressure contact force is limited to the elastic restoring force within a limited partial range of the packing 16, Therefore, the initial pressure contact force may not necessarily be sufficient.
In addition, in such a structure, the pressure force against the surface of the tube body 1 is partial at the packing 16 and is within the range shown by the solid line and the imaginary line in FIG. 5, so the roundness of the tube body 1 is If this is not achieved properly, the flat absorbability of the tube body at the joint surface 23' is often not necessarily sufficient. Furthermore, when the tube body 1 expands and contracts as shown by arrow A in FIG. In any case, the sealing performance is unstable because an unreasonable force is applied and the force acting on the joint seal on the pipe body 1 is inevitably lower than when it is joined to the pipe body 1 in the solid line state. Become something.

``Structure of the invention'' Means for solving the problems The present invention has been devised to solve the problems of the conventional products as described above, and includes a locking mechanism that engages with a cylindrical connecting sleeve. A packing accommodating portion having a corner portion is formed in the combined body, and a packing accommodating portion having a C-shaped cross section having a lumen is accommodated in the packing accommodating portion, and the outer surface of the pipe body to be connected by the C-shaped packing and the above-described cylindrical connecting sleeve In the packing, in its natural state, the outer surface facing the inner cavity is curved in a series of circular arcs, and the side wall of the packing is connected to the cylindrical sleeve. The wall thickness on the joint end side relative to the outer surface of the pipe body to be connected is made larger than the thickness, and the height of the packing is 15 mm higher than the height of the packing accommodating portion described above.
% or more.

Effect According to the present invention as described above, the outer surface of the packing forms a cross-sectional shape different in its natural state from that of the packing housing portion having the corner portion of the engaging portion body,
Since it is a series of circular arcs and its height is 15% or more larger than the packing housing portion, the packing is not only compressed in the height direction when attached to the pipe body, but also has its arcuate curved portion. is bent to enter and join the corner portion of the engaging part body to form a stable sealing relationship, and to achieve a preferable pressure seal due to the restoring force of the bent state as described above. It is possible to form a preferable sealing state even in a pipe body that has been heated, and to ensure stable sealing conditions even when the pipe body expands and contracts.

Embodiment A specific embodiment of the present invention will be described with reference to the attached drawings. As shown in FIG. An engaging part body 10 which has a curved surface 6b and is accommodated therein.
This is similar to the conventional one shown in FIG. 5 described above, in which the packing accommodating portion 11 and the engaging portion 12 for the connecting sleeve are provided in stages.
The end locking portion 1 of the sleeve 14 is attached to the engaging portion 12.
The packing 6 accommodated in the packing accommodating portion 11 is as shown in FIG. 2 in its natural state when taken out from the packing accommodating portion 11. The relationship between the wall thickness t of the portion close to the lip portion that connects to tube body 15 and the wall thickness W of the portion close to the lip portion that connects to tube body 1 (the area protruding from the inner part of the inner cavity 6a) is W= 1.8~
2.5, that is, the wall thickness t is about the same as that of the conventional pipe joint shown in Fig. 5 with the same dimensional conditions, while the W is approximately twice that of the conventional pipe joint described above. The wall thickness W increases as it approaches the joint surface with the tubular body 1. Also, regarding the width l of the joint surface 3 to the tube body 1, l = 3t
4t, this l is also increased with respect to the wall thickness t at least by an amount corresponding to the increase in W. Furthermore, the height of the packing 6 in such a natural state is the same as that of the packing accommodating portion 1 of the engaging part body 10, whose relationship with the engaging part body 10 is shown in FIG.
15% or more, preferably 15 to 40% larger than the height of No. 1. The radius of curvature of the above-mentioned curved surface is at least 4 times or more, preferably 5 to 8 times, the radius of curvature of the corner portion 11c. That is, by housing the packing 6 in the housing portion 11, as shown in FIG.
A gap 7 is formed between the series of arcuate curved surfaces 6b and the corner portion 11c of the accommodating portion 11.
When the packing 6 in its natural state is pressed against the outer surface of the pipe body, the joint surface 3 is pushed up to the joining line C...C and packed toward the corner 11C. The whole part is pushed in and deformed to close the gap 7, and the joint surface 4 part engages with the locking part 15 and the first
Assemble as shown.

That is, it is clear that the packing 6 is sufficiently compressed in the height direction and is bent to join to the outer surface of the tube body 1.

``Effect of the invention'' According to the invention as described above, the packing 6 is not only appropriately compressed in the height direction but also bent and set in the housing part, so that the connected pipe body 1 is flat. It is clear that it is possible to form a pipe fitting that effectively follows changes in the pipe diameter and has a large amount of flat absorption even under conditions where the pipe body 1 is compressed as described above even when the pipe body 1 expands and contracts. The packing 6 can respond sufficiently quickly, and there is no tendency for the packing 6 to float up from the surface of the tube, thus ensuring a stable sealing relationship even when the tube expands and contracts. This is a highly effective idea in practical terms.

[Brief explanation of drawings]

The drawings show embodiments of the invention,
Fig. 1 is a partial sectional view showing the device according to the present invention in its usage state, Fig. 2 is an explanatory diagram of the structural relationship of the packing in its free state, and Fig. 3 is a state in which the packing is set in the engaging member. cross-sectional view, 4th
The figure is a partial sectional view similar to FIG. 1 showing the conventional device in use, and FIG. 5 is an explanatory diagram of the structure of the packing in a free state. However, in these drawings, 1 is a tube body, 3,
4 is the joint surface, 6 is the packing, 6a is the inner cavity,
6b is an arcuate curved surface, 7 is a gap, 10 is an engaging part body, 11 is a packing accommodating part thereof, 11c is a corner part thereof, 12 is an engaging part thereof, 14 is a sleeve, and 15 is a locking part. It is something.

Claims (1)

[Scope of utility model registration request] A packing accommodating portion having a corner portion is formed in the engaging portion body adapted to engage with the cylindrical connection sleeve, and a packing accommodating portion having a C-shaped cross section having a bore is accommodated in the packing accommodating portion, and the packing is connected by the C-shaped packing. In a device that seals between the outer surface of the pipe body and the cylindrical connection sleeve,
In its natural state, the packing is curved in a series of circular arcs on the outer surface facing the inner cavity, and the connecting end to the outer surface of the tubular body to be connected to the cylindrical sleeve is formed by the thickness of the connecting end side of the packing. A telescopic flexible pipe joint mechanism characterized in that the wall thickness on the part side is large and the height of the packing is 15% or more greater than the height of the packing accommodating part.