JPH0543352Y2 - - Google Patents

Description

[Detailed description of the invention] "Purpose of the invention" The present invention relates to the invention of a telescopic flexible pipe joint, which allows easy insertion and removal of the pipe body, allows expansion and contraction smoothly under conditions of little resistance, and which is designed to reduce internal pressure. The object of the present invention is to provide a joint mechanism that exhibits effective sealing performance against both external pressure and external pressure.

(Industrial application field) A pipe joint mechanism that is expandable and flexible.

(Prior Art) In many cases, it is necessary to extend, contract, or flex the pipe bodies connected to each other in a pipe joint, and a number of joint mechanisms that meet such requirements have been proposed in the past.

That is, by forming the packing material that acts as a seal into a hollow shape with a U-shaped cross section, the contact pressure or friction against the tube body is reduced, allowing expansion and contraction of the connected tube body, and the deformation of the packing material is prevented within the housing. Efforts are being made to allow flexibility to a certain extent.

(Problem to be solved by the invention) However, in the conventional products as described above, there is a limit to the amount of expansion/contraction or flexibility that can be tolerated, and expansion/contraction or flexion exceeding the limit can result in conditions where the entire structure is fixed. As a result, a portion of the packing material becomes extremely deformed or twisted, and its sealing action is significantly impaired. Additionally, if the structure allows for expansion, contraction, or bending, the seal against the connected pipe body will be impaired, and the difference in internal and external pressures will fluctuate greatly, especially in fluid pipes that are clearly accompanied by pulsation. Furthermore, it is difficult to ensure an effective seal under conditions that cause vibrations and the like.

In general, it is inevitable that the mechanism configuration becomes complicated and the seal structure becomes large.

"Structure of the invention" (Means for solving the problem) A packing accommodating part formed at the end of a joint body such as a housing or a sleeve has a circular cross section exceeding 180 degrees, and the packing accommodating part is accommodated in the packing accommodating part. Similarly, a protrusion with a circular cross section exceeding 180° is formed at the center in the width direction of the packing, and constrictions are formed at both ends of the protrusion with a circular cross section. The above-mentioned packing accommodating portion is provided with pressure contact portions projecting outwardly from each other, a recessed portion is formed between these pressure contact portions, and a first lip portion is provided at the end of the pressure contact portions, and both sides of the circular cross-sectional protrusion are provided. A telescopic flexible pipe joint characterized in that a second lip portion is formed by forming a notch in the tube.

(Function) The packing accommodating portion formed at the end of the joint body and the circular cross-sectional protrusion at the center in the width direction of the packing accommodated in the packing accommodating portion each have a circular cross-section exceeding 180°, and the cross-section is circular. By forming constrictions at both ends of the part, it is possible to connect the joint body and the packing, and also to facilitate the rotation between the joint body and the packing, that is, the inclined bending of the tube inserted through the packing. become

Further, the constricted portion as described above facilitates the tilting deformation of the first lip portion and stabilizes the contact seal with the surface of the inserted tube.

The pressure contact portions or the first lip portions on both sides of the packing are in balanced pressure contact with the outer surface of the pipe body to be connected, and the second lip portion is pressure-contacted and sealed to the packing receiving portion.

When the pipe to be connected is bent, the circular cross-section protrusion of the packing rotates appropriately within the circular cross-section packing receiving portion under conditions of low overall resistance, following the bending inclination of the pipe, and forming a stable sealing relationship just as in the normal state.

The first lip portion and the second lip portion provided on each side of the packing perform a double sealing action against external pressure and internal pressure, respectively.

(Example) Specific embodiments of the present invention as described above will be described as shown in the accompanying drawings.
A packing accommodating portion 21 formed at the end of the joint body 2 such as a housing or a sleeve has a circular cross section of more than 180° as shown in FIG. 1 or FIG. Packing 1
A circular protrusion 11 having a cross section of more than 180° is also formed in the middle part in the width direction, and press contact parts 12, 12 are provided oppositely on both sides of the packing housing part 21, protruding outward from the packing accommodating part 21, with a constriction part 17 interposed therebetween. A recessed portion 13 as shown in FIG. 2 is formed in the open state between the pressure contact portions 12, 12, and a first lip portion 14 is provided at the end of the pressure contact portion 12, and a packing accommodating portion as described above is provided. A protrusion 1 with a circular cross section fitted into the interior of the 21
A second lip portion 16 is formed by forming cut portions 15 on both sides of the second lip portion 1.
6 is configured to protrude moderately outward from the circular area of the circular cross-sectional protrusion 11 as shown in FIG. 2 in the released state.

The operation or working relationship of the device according to the present invention as described above is as shown in FIG. 3 and subsequent figures. That is, the protrusion 11 having a circular cross section is received in the accommodating part 21 to form a coupling relationship, and when the pipe body 3 to be connected is inserted, the protruding part 11 having a circular cross section of the packing 1 accommodated in the accommodating part 21 is inserted as appropriate. The packing 1 is rotated and displaced with no residual stress remaining in the packing 1, so that the inner surface of the pressure contact portion 12 or the first lip portion 14 becomes parallel to the outer surface of the tube body 3 with almost no resistance. The tube body 3 can be inserted and connected without opening the housing or the sleeve 2 in parts, that is, with the packing 1 still attached to the sleeve 2.

The working relationship in the normal state when the pipe body 3 to be connected is inserted and connected is as shown in FIG. The lip portion 16 is pressure-sealed against the inner surface of the circular cross-section housing portion 21,
As a result, a double seal mechanism is formed against both external pressure and internal pressure. In other words, overlapping sealing mechanisms are formed by the lip portions 14 and 16 on the left side in the drawing against external pressure, and by the lip portions 14 and 16 on the left side in the drawing against internal pressure, so it is stable against both internal and external pressure. It is. Also, the first lip portions 14, 14 are connected to the tube body 3.
The reaction force caused by being pressed against the outer surface of the circular protrusion 1
Since the packing 1 is balanced in one part, even if the packing 1 can be rotated to a certain extent, the packing 1 forms a stable set state.

If the pipe body 3 to be connected is bent, the fourth and fifth
As shown in the figure, the packing 1 is rotated by an appropriate angle within the accommodating part 21, and the tip of the accommodating part 21 is positioned within the constricted part 17 and smoothly follows the bent angle. Moreover, each lip part 1
4, 16 does not change at all, that is, the second lip portion 16 has a circular cross-section in the receiving portion 21.
It is clear that the first lip part 14 and the entire packing 1 rotate within the packing accommodation part 21 with almost no resistance, so the fourth lip part 14 and the fourth lip part 14 are the same.
In any state shown in FIG. 5, the amount of compression is the same as in the case shown in FIG. 1, and a stable sealing state is ensured. The resistance to bending of the tube body 3 is also small, and the tube body 3 has excellent flexibility.

In addition, when the tube body 3 is deformed, as shown in FIG. 6, even if it deforms from the solid line state to the imaginary line state, the entire packing 1 will receive the load, and the packing 1 will be affected by the circular protrusion 11. Since sufficient volume is provided, a balanced and stable state can be maintained. When the pipe body 3 is deformed from the virtual line state to the solid line state, the both side press-contact parts 12 or the first lip part 14 are balanced and follow the deformation, and the packing 1
The basic form of the seal is stably maintained to ensure an appropriate sealing relationship.

"Effects of the Invention" It is clear that according to the invention as explained above, the circular cross-sectional protrusion can rotate with almost no resistance within the packing accommodating part, and can ensure sufficient expansion/contraction and flexibility. Moreover, even in such a bent state, the entire packing rotates and follows within the housing part, so a stable sealing relationship is always formed, and unreasonable compressive deformation or torsional force or residual stress is not applied to a part. Since there are no holes, an effective sealing effect can be obtained, and since the packing is simply accommodated by forming a circular cross-sectional accommodating portion at the end of the sleeve or housing, it can be used freely without complicating or increasing the size of the structure. In addition, when inserting and removing the pipe body to be connected, the smooth rotation of the packing ring as described above can be obtained appropriately, so it is sufficient to simply insert and remove the pipe end with the packing attached, making it extremely easy to handle. This invention has the advantage of being simple and has great practical effects.

[Brief explanation of the drawing]

The drawings show the technical content of the present invention; Fig. 1 is a cross-sectional view of the device according to the present invention, Fig. 2 is a cross-sectional view showing the packing in a naturally released state, and Fig. 3 shows the pipe to be connected. Figures 4 and 5 are cross-sectional views showing the relationship between the insertion and removal operations of the body, Figures 4 and 5 are cross-sectional views showing the working relationship when the tube body is bent, and Figure 6 is a cross-sectional view showing the packing follow-up state when the tube body is deformed. be. In these drawings, 1 is a packing, 2 is a housing or a sleeve, 3 is a pipe body to be connected, 11 is a circular cross-sectional projection, 12 is a pressure contact part,
13 is a recessed part, 14 is a first lip part, 15 is a notch part, 16 is a second lip part, 17 is a constricted part, 2
1 indicates a packing accommodating portion.

Claims (1)

[Scope of utility model registration request] The packing accommodating portion formed at the end of the joint body such as a housing or sleeve has a circular cross section of more than 180°, and the widthwise central portion of the packing accommodated in the packing accommodating portion also has a cross section of more than 180°. A protrusion with a circular cross section is formed, and a constriction is formed at both ends of the protrusion with a circular cross section, and pressure contact portions are provided on both sides of the packing that protrude to the outside of the packing accommodating portion via the constriction. A recessed portion is formed between these press-contact portions, and a first lip portion is provided at the end of the press-contact portion, and a notch portion is formed on both sides of the circular cross-section protrusion to form a second lip portion. A telescopic flexible pipe joint featuring: