JPH0569480U - Pipe fitting - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a pipe joint with enhanced coupling force with a pipe to be connected. A pair of semi-annular housings 11 are coupled in a ring shape, engaging claws 14 are provided along both sides of the housing along a semi-periphery, and the engaging claws on both sides are connected to two connecting pipes 30.
Annular groove 30a (31a) provided at each end of (31)
In a pipe joint to be engaged across, the engaging claws 14 are provided with a plurality of fastening projections 17 protruding radially and outwardly, and are fastened in a gap between the engaged claws 14 and the annular groove. The protrusion is designed to fit in.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pipe joint generally called a victor type.

[0002]

[Prior Art]

 4 to 7 show an example of a conventional Victorian pipe joint. It has a pair of casting housings 1A and 1B that are vertically symmetrical and formed in a semi-annular shape, and claw portions 1a and 1b are formed on both sides along the inner peripheral edges of both housings 1A and 1B. Two pipes 2A, 2B to be connected are provided with annular grooves (grooves) 2a, 2b in the vicinity of the respective pipe ends, and both sides of the housings 1A, 1B straddle the annular grooves 2a, 2b of the two pipes 2A, 2B. The claw portions 1a and 1b of 1 are engaged. Further, as shown in FIGS. 4 and 5, elastic packings 5 made of rubber are attached along the inner peripheral surfaces of the housings 1A and 1B, and the elastic packings 5 are extended over the respective pipe ends of the pipes 2A and 2B. And attach them closely to these outer peripheral surfaces. Further, the two pipes 2A and 2B are connected by fastening the flanges provided at both ends of the housings 1A and 1B together with the bolt 3 and the nut 4. In this case, both the housings 1A and 1B come into close contact with the elastic packing 5 from the outside, and the elastic packing 5 also comes into close contact with the outer peripheral surface of each pipe end portion over the two pipes 2A and 2B by an elastic force, so that two seal members are provided. The airtightness or the liquidtightness between the tubes 2A and 2B is ensured. Further, as shown in FIG. 6, the width dimension of the claw portion 1a (1b) of the housing 1A (1B) is narrower than the groove width dimension of the annular grooves 2a and 2b of the tubes 2A and 2B, and the width between them is wide. A gap G is provided due to the size difference. The play due to the gap G improves workability during assembly. Further, by providing the play, there is an advantage that the expansion and contraction of the pipes 2A and 2B in the axial direction, the misalignment, the bending, and the like can be absorbed. However, if a gap G larger than necessary is provided as dimensional play, the following problems occur. During use after piping, if load fluctuations due to fluid pressure in the pipes or some external force acts, both pipes 2A and 2B move relative to each other in the pipe axis direction, and rotational force acts. Deformation such as misalignment, bending, and bending occurs. Therefore, the required sealing property cannot be secured. In order to deal with such a problem, it is necessary to reinforce and support the important points of both pipes after the piping with a hanger, which is disadvantageous in terms of equipment cost due to increase in labor and parts. In this regard, there is known a structure in which the play due to the gap G is hardly provided as shown in FIG. That is, if the groove width of the annular groove 2a (2b) of the tube 2A (2B) is narrowed and the gap G formed between the annular groove 2a (2b) and the claw portion 1a (1b) of the housing 1A (1B) is set to zero or minimum, The occurrence of misalignment or bending of the tubes 2A and 2B can be suppressed to some extent.

[0003]

[Problems to be solved by the device]

 However, when the gap G is not provided as in the structure of FIG. 7, there is an advantage that relative deformation between the pipe joint and the pipe can be prevented, but there is no play, so the workability is significantly reduced. There is. In addition, the absence of play cannot avoid some precision error in the pair of housings 1A and 1B, so that it is extremely difficult to match the joint surfaces of the two. In this case, if they are forcibly joined, the elastic packing 5 squeezes out from the joining surface to the outside, which not only deteriorates the appearance but also deteriorates the sealing property of the packing itself. As described above, in the case where the play by the gap G in FIG. 6 is provided and in the case where the play is not provided in FIG. 7, both structures have their respective advantages, and both of them have a problem to be solved. Therefore, an object of the present invention is to solve the above-mentioned various problems, and at the same time, to provide a pipe joint which is improved and also improved in rigidity against bending after connection.

[0004]

[Means for Solving the Problems]

 In the pipe joint according to the present invention, a pair of semi-annular housings are coupled to each other in a ring shape, engaging claws are provided along the semi-periphery on both sides in the axial direction of the housing, and two engaging claws on both sides are connected. When engaging over the annular grooves provided at each end of the pipe, the engaging claws are provided with a plurality of fastening projections radially and projecting outward, and the engaging claws and the annular grooves engaged with each other. The protrusion for tightening is engaged in the gap between and. It is preferable to remove the peripheral end portion of the engaging claw as the tightening protrusion in consideration of the assemblability. Further, by providing the taper portion on the side of the fastening projection which faces the annular groove, the initial engagement into the gap G formed between the fastening groove and the annular groove is easy and the assemblability is enhanced.

[0005]

[Action]

 When starting the final tightening with bolts and nuts during piping, the tightening protrusions will bite into the gap between the engaging claw and the annular groove in the annular groove of the pipe with which the engaging claw of the housing engages. And enter. As a result, there is almost no play between the engaging claw and the annular groove, the tubes are firmly connected, and expansion and contraction in the axial direction and bending are suppressed.

[0006]

【Example】

 An embodiment of a pipe joint according to the present invention will be described below with reference to the drawings. As shown in FIG. 1 to FIG. 3, the pipe joint 10 is a pair of semi-annular pipes, and casting housings 11 of the same shape are vertically joined together and joined. On the inner peripheral surface of the housing 11, an elastic packing 20 made of a rubber material and having an annular shape having a size capable of closely contacting the inner peripheral surface of the housing 11 is mounted. Each of the upper and lower housings 11 has left and right coupling flanges 12 and 12 protruding from both ends, and bolts 15 are inserted into respective fastening holes 13 and tightened with nuts 16, so that the upper and lower housings 11 and 11 are fastened together. Be combined. In addition, engaging claws 14 and 14 are provided on both sides in the axial direction of the housing 11 along the semi-circular peripheral edge, and the engaging claws 14 and 14 on both sides are connected to both sides as shown in FIG. The two pipes 30 and 31 are arranged so as to be engaged with annular grooves (grooves) 30a and 31a on the outer circumferences of both pipe ends. As described with reference to FIG. 6, the width dimension of the engaging claw 14 and the annular groove 30a (31a) is set so that a gap G is formed between both members. The annular grooves 30a and 31a of both pipes 30 and 31 are machined on-site with special tools and equipment.

Here, a plurality of convex ribs (tightening projections) 17 are integrally formed on each side surface of the housing 11 on one side and the other side in the axial direction. In the embodiment, one housing 11 is provided with three ribs 17 on one side and another on the other side, and a total of six ribs 17 are radially provided on both side surfaces. As the position where the rib 17 is provided, avoid the inner angle (peripheral end) 12a, 12a of the lower surface of the left and right coupling flanges 12, 12 or the vicinity thereof, and an angle of 30 ° in the embodiment from the diametrical axis of the housing 11. There are a total of 3 places, 2 places that are distributed to the left and right, and 1 place that is located at an upper or lower angle of 90 °.

The reason for avoiding the installation of the rib 17 on the lower surface inner angle 12a of the coupling flange 12 is that the lower surface inner angle 12a of the coupling flange 12 is initially set when engaging with the annular groove 30a (31a) of the pipe 30 (31) to assemble. This is because the rib 17 protruding at this position is a hindrance to the assembly because the rib 17 starts to be engaged with the annular groove 30a (31a). Further, as is apparent from FIG. 2, considering the convenience of engaging the annular groove 30a (31a) with the engagement claw 14 into the gap G, the longitudinal direction of the rib 17 has an axial center. It is provided perpendicular to the passing diameter, that is, perpendicular to the diameter in the left-right direction in the drawing that passes through the lower surfaces of the left and right coupling flanges 12, 12. Except for the above restrictions, the number of ribs 17 installed and the left-right distribution angle that avoids the lower surface inner angle 12a are not limited to 30 ° in view of easy assembly. Further, as shown in the drawing, it is preferable to provide a tapered portion 17a on the side of the rib 17 facing the annular groove 30a (31a). By providing the taper portion 17, the initial engagement in the gap G is easy and the assembling property can be improved.

Next, an example and a function of connecting the pipes 30 and 31 by the pipe joint 10 of the embodiment will be described. As an example of an assembly procedure at the time of piping, as shown in FIG. 2, the axial lines of the two pipes 30 and 31 to be connected are aligned so that their pipe ends face each other, and the lip seal portions 21 on both sides of the elastic packing 20 are arranged. , 21 are mounted on the outer peripheral surfaces of the end portions of both pipes 30 and 31. A pair of housings 11 and 11 are joined so as to embrace the elastic packing 20 inside, and joint flanges 12 and 12 of both housings are temporarily tightened with a bolt 15 and a nut 16. However, the pair of housings 11, 11 are temporarily assembled with the bolts 15 and the nuts 16, and the elastic packing 30 is attached along the inner peripheries of both the housings 11, 11 in advance, and the pipe joint in the temporarily assembled state. It is also possible to insert the tube ends of the tubes 30 and 31 into the tube 10 from both sides.

As a result, the final tightening with the bolt 15 and the nut 16 is performed. By the final tightening, the left and right engaging claws 14, 14 of the pair of upper and lower housings 11, 11 engage with the annular grooves 30a, 31a of the tubes 30, 31, respectively. At the time of engagement, the lower surface inner angle 12a of the engagement claw 14 first engages with the annular groove 30a (31a). The plurality of ribs 17 are also engaged in the gap G formed in the annular groove 30a (31a) by the engagement of the engagement claws 14. By engaging the rib 17 into the gap G, the engaging force in the annular groove 30a (31a) of the engaging claw 14 is increased and tightened, that is, there is no play and the connection torque of the pipes 20 and 21 is increased and strengthened. It When the rib 17 is engaged in the gap G, the rib 17 is provided with the tapered portion 17a, which facilitates the assembling and has an advantage that it is not easily scratched.

By firmly coupling the pair of housings 11 and 11, the elastic packing 20 is brought into close contact with the inner peripheral surface of the housing 11, and the lip seal portions 21 and 21 on both sides are pipe end portions of the pipes 30 and 31. Stick to the outer peripheral surface. Due to the close contact of the elastic packing 20, the pipes 30 and 31 on both sides are connected while ensuring a required liquid tightness or air tightness.

[0012]

[Effect of the device]

 As described above, the pipe joint according to the present invention is suitable for the victoric type, and the engaging claw of the housing is provided with a plurality of ribs (tightening projections) protruding outward so that After tightening, when the engaging claw is engaged with the annular groove of the pipe to be connected, the rib bites into the gap between the engaging claw and the annular groove, and there is almost no play, and the bending load is reduced. It is effective in suppressing the expansion and bending in the axial direction by strengthening the connection between the pipes.

[Brief description of drawings]

FIG. 1 is a front view of a partial cross-section of an assembled pipe using a victoric pipe joint according to an embodiment of the present invention.

FIG. 2 is an assembled side view of a partial cross-section with a connection pipe by the pipe joint of the embodiment.

FIG. 3 is a perspective view of a housing of the pipe joint of the embodiment.

FIG. 4 is a side sectional view of an assembly with a connecting pipe using a conventional Victaulic pipe joint.

FIG. 5 is a front cross-sectional view of assembly with a connecting pipe using a conventional victoric pipe joint.

FIG. 6 is a partial assembly sectional view of a pipe using a conventional pipe joint.

FIG. 7 is a partially assembled sectional view of a conventional pipe joint of another type.

[Explanation of symbols]

10. ． Pipe joint, 11. ． Housing, 12. ． Coupling flange, 13. ． Bolt fastening holes, 14. ． Engaging claws, 1
5. ． Bolts, 17. ． Rib (protrusion for tightening), 17
a. ． Tapered portion, 20. ． Elastic packing, 30, 3
1. ． The connected tubes, 30a, 31a. ． An annular groove.

Claims (3)

[Scope of utility model registration request] 1. A pair of semi-annular housings are coupled to each other in a ring shape, engaging claws are provided along the semi-periphery on both sides of the housing in the axial direction, and the engaging claws on both sides are provided at each end of two connecting pipes. In a pipe joint that engages over an annular groove provided in a section, a plurality of fastening projections are provided on the engaging claw in a radially protruding manner, and a gap between the engaged claw and the annular groove is provided. A pipe joint characterized in that a locking projection is engaged with the. 2. A plurality of fastening projections are provided radially except the peripheral end portion of the engaging claws so as to project outwardly.
The pipe fitting described in. 3. The pipe joint according to claim 1, wherein a taper portion is provided on a side of the fastening projection which faces the annular groove.