JP2556937Y2 - Flexible tube connection structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure for a flexible pipe, and more particularly to a structure for reliably preventing water leakage when connecting the flexible pipe to a joint.

[0002]

2. Description of the Related Art Conventionally, as a structure for connecting a flexible pipe to a joint, as shown in FIG. 3, a flange (b) integrally formed at an end of the flexible pipe (a) is connected to an end face of a joint body (c). And a flange (f) of a flanged nut (d) which is screwed to the joint body (c) to hold it via a ring-shaped packing (e).

[0003]

In the conventional connection structure, the flange (b) is formed by turning back the end of the flexible pipe (a), but the outer diameter of the flange (b) is reduced. If is set large, the folded portion may be excessively plastically deformed and cracked, so that there is a limit to increasing the outer diameter of the flange. on the other hand,
The inner diameter of the flange (f) of the flanged nut (d) cannot be smaller than the outer diameter of the flexible tube (a) because it must pass through the flexible tube (a). Under such circumstances, the width of the flange (b) that is hooked on the flange (f) cannot be so wide at present. Therefore, when the flanged nut (d) is tightened, a force is applied to the flange (b) to push up the outer peripheral edge thereof by the flange (f). On the other hand, since the packing (e) is in contact with the vicinity of the inner peripheral edge of the flange (b), by tightening the flanged nut (d), the joint body (c) is connected to the flange (b) via the packing (e). A force is applied to push down the inner peripheral edge of). Then, the flange (b) is deformed into a mortar shape by the bending moment generated by the pair of acting forces. In that case, the deformation usually does not occur evenly in the circumferential direction, so that the contact of the flange (b) becomes uneven and water leakage occurs. Further, when the deformation of the flange (b) is excessive, the packing (e) is damaged as shown in FIG.

Conventionally, in order to solve such a problem, as shown in FIG. 5, for example, as shown in FIG. Thus, there has been proposed one in which the rigidity of the flange (g) is increased. However, since the rigidity of the root of the flange (g) is the same as that of FIG. 3 also in this proposal, the flange (g) is deformed into a mortar shape by the bending moment as described above, and the above problem is still solved. Not done.

On the other hand, separately from this, as shown in FIG.
By inserting a metallic ring (h) between the flanged nut (d) and the flange (b) and setting the inner diameter to be smaller than the inner diameter of the nut (d), It has been proposed to transmit the force to the inner peripheral side of the flange (b) to reduce the bending moment. However, in the case of this proposal, the ring (h) is separate from the packing (e).
In addition, during the production, it is necessary to perform a complicated operation of forming the flange (b) by turning the flexible tube (a) back and then forming the flange (b) after passing the ring (h) through the flexible tube (a), which is costly. There is a problem.

The present invention has been made in view of such points, and the purpose thereof is to transmit the force from the flange of the flanged nut to the joint body substantially along the axial direction. It is an object of the present invention to provide a connection structure for a flexible pipe which can solve the above-mentioned problem at a glance by preventing a bending moment from being applied to the inner surface and sealing the inner peripheral side.

[0007]

In order to achieve the above object, a solution of the present invention is to provide a flange integrally formed at an end of a flexible pipe with a joint body and a flanged nut screwed to the joint body. It is assumed that the flexible pipe has a connection structure sandwiched between the flexible pipes. On the other hand, a seal member formed by insert-molding an elastic body on the inner peripheral side of a ring made of a rigid body is provided between the flange of the flexible pipe and the joint body, and the outer diameter of the ring is reduced. The elastic body is set to be larger than the inner diameter of the flange of the nut, and the elastic body is formed so as to be in close contact with the flange of the flexible pipe and the end face of the joint body.

[0008]

With the above arrangement, the force from the flange of the flanged nut is transmitted from the outer peripheral portion of the flange of the flexible pipe to the joint body through the ring of the seal member, and the path is substantially along the axial direction. Depending on the force, no bending moment is applied to the flange. In addition, since the ring bears the compressive force, the elastic body of the seal member is compressed almost only to the thickness of the ring, so that the force transmitted by the elastic body is reduced and the bending moment applied to the inner peripheral portion of the flange is reduced.
Therefore, the flange does not deform into a mortar shape. And the sealing property between the flange and the joint body is maintained by the elastic body which is appropriately deformed.

Further, the seal member itself is a single member, and only needs to be incorporated when the flanged nut is screwed into the joint body, so that the cost is low.

[0010]

Embodiments will be described below. FIG. 1 shows a connection structure of an embodiment, 1 is a flexible pipe, 2 is a flange formed integrally with the end of the flexible pipe 1 by flange turning, 3 is a joint body, and 4 is screwed to the joint body 3. A flanged nut, wherein the flange 2 is sandwiched between an end face of the joint body 3 and a flange 4 a of the flanged nut 4.

[0011] Between the flange 2 and the joint body 3,
A seal member 5 as shown in FIG. 2 is provided. The seal member 5 includes a ring 5a made of a rigid body such as a steel material, and an elastic body 5b made of, for example, rubber, which is insert-molded on the inner peripheral side of the ring 5a. The outer diameter of the ring 5a is set to be larger than the inner diameter of the flange 4a of the nut 4. The thickness of the ring 5a is set to about 80% of the thickness of the elastic body 5b (substantially equal to the diameter of the elastic body 5b) in a state where the ring 5a is not subjected to the restraining force (the state of FIG. 2). Therefore, when the flanged nut 4 is tightened (the state shown in FIG. 1), the elastic body 5b is deformed and is in close contact with the flange 2 of the flexible pipe 1 and the end face of the joint body.

Therefore, in the above embodiment, when the flanged nut 4 is tightened, the force from the flange 4a of the flanged nut 4 passes through the ring 5a of the sealing member 5 from the outer periphery of the flange of the flexible pipe 1 and the joint body 3 And the path is substantially along the axial direction, so that no bending moment is applied to the flange 2 by this force. In addition, since the ring 5a bears the compressive force, the elastic member 5b of the seal member 5 is compressed only up to the thickness of the ring 5a, and the force transmitted by the elastic member 5b decreases, and the bending moment applied to the inner peripheral portion of the flange is reduced. Become smaller. Therefore, the flange 2 does not deform into a mortar shape. And the sealing property between the flange 2 and the joint main body 3 is maintained by the elastic body 5b which is appropriately deformed. As a result, water leakage can be effectively prevented.

Further, the sealing member 5 itself is a single member, and it is only necessary to incorporate the sealing member 5 when the flanged nut 4 is screwed into the joint body 3, so that the cost can be reduced.

In the above embodiment, the ring 5a is made of a steel material. However, a rigid body having a certain degree of rigidity may be used, and general metals and other various materials can be used. Although the elastic member 5b is made of rubber, any material may be used as long as the material has lower rigidity than the ring 5a and is deformed and adheres to the flange 2 of the flexible pipe 1 and the end face of the joint body.

[0015]

As described above, the connecting structure of the flexible pipe according to the present invention is such that the elastic body is insert-molded between the flange of the flexible pipe and the joint body on the inner peripheral side of the ring made of the rigid body. While setting the outer diameter of the ring larger than the inner diameter of the flange of the nut,
Since the elastic body is formed so as to be in close contact with the flange of the flexible pipe and the end face of the joint main body, the seal between the flange and the joint main body is sealed by the elastic body of the seal member. By not applying a bending moment that deforms the mortar into a mortar shape, water leakage can be effectively prevented, and costs can be reduced in terms of the configuration of the seal member and ease of assembly.

[Brief description of the drawings]

FIG. 1 is a longitudinal side view of an embodiment,

FIG. 2 is a longitudinal sectional side view of the seal member of the embodiment in a state where it is not subjected to a binding force,

FIG. 3 is a diagram corresponding to FIG. 1 of a conventional example,

FIG. 4 is a longitudinal side view showing a conventional example in a water leakage state;

FIG. 5 is a diagram corresponding to FIG. 1 of another conventional example,

FIG. 6 is a diagram corresponding to FIG. 1 of still another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flexible pipe 2 Flange 3 Joint main body 4 Nut with flange 4a Flange 5 Seal member 5a Ring 5b Elastic body I Flexible pipe B Flange C Joint body D Nut with flange E Packing F

Claims (1)

(57) [Scope of request for utility model registration] 1. A flexible pipe connection structure in which a flange integrally formed at an end of a flexible pipe is held between a joint body and a flanged nut screwed to the joint body.
A seal member formed by insert-molding an elastic body on the inner peripheral side of a ring made of a rigid body is provided between the flange of the flexible pipe and the joint body, and the outer diameter of the ring is set to the inner diameter of the flange of the nut. A flexible pipe connection structure characterized in that the elastic body is set to be larger than the elastic pipe and the elastic body is formed so as to be in close contact with the flange of the flexible pipe and the end face of the joint body.