JPH0736226Y2 - Victoric pipe fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a pipe joint called a victor type for connecting pipes having a corrosion-resistant resin lining, such as a water supply pipe for drinks, in particular.

Conventional technology Corrosion of the inside of pipes and pipe fittings is caused by the increase in the amount of chlorine added to prevent deterioration of water quality, for example, as the cause of red water coming out of rust due to corrosion or the deterioration of tap water. There is an inconvenience.

At present, as a type widely used as a water supply pipe, as a corrosion prevention measure, a type in which a corrosion-resistant layer made of a resin lining is applied to both inner and outer peripheral surfaces of a pipe and a pipe joint is mainstream.

By the way, in such a resin-lined pipe, it is often cut into a predetermined length due to the need for size adjustment at the construction site, but at this time, the cut end surface of the pipe is exposed to the metal surface without resin lining. become. As a result, after the pipe joint is connected, corrosion may progress from the exposed pipe end surface of the metal surface, resulting in the inconvenience.

For the purpose of eliminating this, there has been a victoric pipe joint shown in FIG. 9 for example. That is, in the case of this pipe joint, the annular packing 3 is sandwiched and set between the pipe end surfaces of the two pipes 1 and 2 to be connected. As shown,
The packing 3 is provided with lip-shaped seal portions 3a, 3a on both side edges, and the seal portions 3a, 3a on both sides are brought into close contact with the outer peripheral surfaces of the ends of the pipes 1, 2. In addition, a convex contact portion 3b is provided in an annular shape between the seal portions 3a on both sides, so that both end surfaces of the pipes 1 and 2 come into close contact with both side surfaces of the contact portion 3b. It has become. The annular packing 3 having such a shape is closely attached to the inner peripheral surfaces of the pair of upper and lower housings 4. The pair of housings 4 are set over the outer peripheral surfaces of the respective ends of the tubes 1 and 2, and the housings 4 are bolted together to connect the tubes 1 and 2.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In this conventional victoric pipe joint, at the time of assembly, the abutting portion 3b of the packing 3 is sandwiched between the pipe end faces of the pair of opposed pipes 1 and 2 to be connected from both sides 1, 2 This is a structure in which the pair of upper and lower housings 4 are fastened while the pipes are pressed toward the abutting portion 3b of the packing 3 while facing each other.

At this time, by pressing the packing 3 against the contact portion 3b,
The two tubes 1 and 2 may be offset to one side with respect to the center of the housing 4 too much. That is, two tubes 1,
There is a case where the assembling length of No. 2 with respect to the housing 4 is not uniform, and the connecting portion is displaced from the center of the housing 4. Such offset of the tube can lead to imperfect assembly.

The object of the present invention is to make the center of the two pipes of the two pipes relative to the housing not deviated to one of them and to perform centering with good workability, and further, to secure the sealing property between the pipe end faces with a required elastic adhesion force. To provide a type pipe joint.

Means for Solving the Problems A victoric pipe joint according to the present invention includes a pair of semi-annular housings that straddle each end of a pair of connecting pipes and engage with an annular groove provided at each end. And an annular elastic packing that is in close contact with the inside of each housing and in close contact with the outer peripheral surface of each end of the connecting pipe to maintain the sealing property of the connecting portion.

The housing has engaging ridges formed in a circumferentially annular shape at the central portion in the width direction of the inner peripheral surface, and the elastic packings are provided on both side edges of the inner peripheral surface of the housing and the outer peripheral surface of the end portion of the connecting pipe. In addition to having a close seal portion, it has an annular rib portion provided in the central portion of the seal portions on both sides, the annular rib portion is formed with an annular engagement groove to be engaged with the engagement projection of the housing, In this structure, each pipe end surface of the connecting pipe is brought into close contact with the outer surface of the annular rib portion.

Further, in the case of the present invention, if the cross section of the engaging ridge of the housing is formed in a wedge shape, the force that pushes and expands in the left-right direction with respect to the annular engaging groove provided in the annular rib portion increases, and each pipe of the connecting pipe is increased. This is preferable because the close contact with the end face is increased.

Further, according to the present invention, it is preferable to form chamfered portions on both side edges of the mating surface portions of the pair of housings.

Action The annular rib portion of the elastic packing is engaged with the engaging ridge of the housing, and the tube end surfaces of the pair of connecting pipes are brought into close contact with the outer side surface of the annular rib portion while facing each other. As a result, the mounting length of the connecting pipe with respect to the housing becomes uniform, and center alignment is naturally performed. In the annular rib portion of the elastic packing, the engaging ridge on the housing side is engaged in the annular engaging groove, so that the engaging ridge acts as a reinforcing core of the elastic packing. That is, since the pipe end face can be brought into contact with the side face of the annular rib portion of the elastic packing with sufficient pressing force by this reinforcement, the adhesion force to the pipe end face is increased and effective sealing performance can be secured.

Also, by forming the engaging ridges of the housing and the annular engaging grooves on the side of the elastic packing to be engaged with the housing into wedge shapes, the slope force of the wedge increases the contact force of the connecting pipe to the pipe end face. . In addition, the wedge-shaped cross section allows the dimensions of each member to have some play, and high machining accuracy is not required at least in the mating dimension of the engaging projection and the annular rib portion.

Further, by providing the chamfered portions on the mating surface portions of the pair of semi-annular housings, the workability of assembling the pair of opposing connecting pipes is improved.

Embodiment An embodiment of the pipe joint according to the present invention will be described below with reference to the drawings.

1 to 3 show a first embodiment of the pipe joint of the present invention. The pipe joint 10 has a pair of vertically-symmetrical semi-annular casting housings 11, 11 as a main body, and usually, these pairs are bound together to form an annular shape. Two housing members 11, 11
Is set on a rubber elastic packing 20 formed in a ring shape, as shown in FIG. Each of the housings 11 has a coupling flange 11a extending to the outside in the radial direction, and the fastening bolts 12 are attached to the left and right coupling flanges 11a.
A through hole 11b is provided through which the pair of housings 11 and 11 are fastened together by a combination of a bolt 12 and a nut 13.

As shown in FIG. 1, the housing 11 is provided with claw portions 11c, 11c on both sides in the width direction (width dimension in the drawing: W).
These claw portions 11c, 11c are adapted to engage with annular grooves (grooves) 30a, 31a provided in the vicinity of the ends of the two connecting pipes 30, 31, respectively. That is, by engaging the claw portions 11c, 11c of the housing 11 with the annular grooves 30a, 31a across the two connecting pipes 30, 31, the pipe is prevented from coming out. Connection pipe 30, 31
The groove width dimension of each of the annular recessed grooves 30a, 31a is set to be slightly larger than the width dimension of the claw portion 11c of the housing 11, and is set so that a gap is created between them when engaged during assembly. . This gap is a pair of housings for connecting pipes 30 and 31.
The dimensional play of 11, 11 is provided for the purpose of facilitating assembly work. An anticorrosion layer made of a resin lining 32 is formed on the inner peripheral surface of each of the connecting pipes 30 and 31.

Further, each housing 11 has ribs (engaging ridges) 15 extending in a semi-circular shape in the circumferential direction at the central portion in the width: W direction on the inner peripheral surfaces thereof.
Is provided. As shown in the figure, by making the cross-section of the rib 15 into an inverted trapezoidal wedge shape, there is an effect that the engagement force with the annular rib portion 21 of the elastic packing 20 described later is doubled.
Further, the rib 15 needs to be provided at the center of the width dimension W of the housing 11. The reason for this will be described later,
This is because the respective end portions of the two connecting pipes 30 and 31 from the left and right sides are evenly incorporated into the housing 11 from the left and right sides when the pipe is installed.

Here, the elastic packing 20 shown in FIG. 2 is formed by molding a rubber or elastic resin into an annular shape, and is provided with an annular rib portion 21 protruding inward. There is. The annular rib portion 21 has an annular engaging groove 21a that opens outward, and the cross section of the annular engaging groove 21a is a housing.
The rib 15 is formed in a wedge shape with the same taper angle as the rib 15 on the 11 side so that the entire rib 15 can be elastically adhered. However, the annular engaging groove 21a on the side of the elastic packing 20 may not be formed in a wedge shape but may be formed in a slit shape having a quadrangular cross section. If formed in a wedge shape, it is preferable that the width dimension of the annular engaging groove 21a be made slightly narrower than that of the rib 15 on the housing 11 side so that the rib 15 is engaged to elastically expand. Further, seal portions 22, 22 are provided along the entire circumference from both sides of the opening end of the annular rib portion 21. The tip of each seal portion 22 is a tongue-shaped lip portion 22a,
As shown in FIG. 1, the entire seal portion 22 including the lip portion 22a has an inner peripheral surface of the housing 11 and a connecting pipe 30 (31).
Is shaped so as to be able to come into close contact with the outer peripheral surface of the end portion of.

The cross-sectional shape of the rib 15 of the housing 11 is preferably wedge-shaped as in the embodiment, but may be formed in a straight plate shape. Also in this case, the annular engaging groove 21a on the elastic packing 20 side
It is desirable to make the groove width of the groove narrower than the width of the rib 15. At this time, as shown in FIG. ₁ , the relationship between the inner peripheral diameter d ₁ of the claw portions 11c on both sides of the housing 11 and the inner peripheral diameter d ₂ of the rib 15 is that d ₁ ≦ d ₂ It is a condition for achieving workability and function. For example, the claws 11c, 1 on both sides of the housing 11
1c is engaged with the annular grooves 30a, 31a of the connecting pipes 30, 31 on both sides to fix both pipes. Before fixing both tubes, the housing 11
The rib 15 is engaged with the annular engagement groove 21a of the elastic packing 20 and swells, and pushes both connection pipes 30 and 31 outwards on the axis line to prevent the housing 11 from being disabled. This is because.

Here, FIG. 8 shows a partial perspective view of the pair of housings 11, 11 on one side. The other housing in this figure
A mating surface 11e with 11 is shown, and the semicircular claw portions 11c and 11c as described above are provided on both sides of the mating surface 11e. A chamfered portion 11f inclined inward is provided at the base end portion of each claw portion 11c.

An example of use and operation of the pipe joint of the first embodiment having the above configuration will be described.

When connecting the two connecting pipes 30 and 31, the two pipes 30 and 31 are arranged with their ends facing each other. If you need
The connecting pipes 30 and 31 are cut into a predetermined size, and the opposing pipe end faces 30b and 31b are exposed by forming a layer between the metal surface of the pipe body and the surface of the resin lining 32.

In this state, the elastic packing 20 is elastically fitted so as to straddle the outer peripheries of the connection pipes 30 and 31. As a result, the pair of upper and lower housings 11, 11 are held together and set. At this time, as shown in FIG. 8, the mating surfaces 11e, 11e of the pair of housings 11, 11 have claw portions 11c, 1 extending from both sides thereof.
Since the chamfered portion 11f inclined inward is provided at the base end portion of 1c, the claw portions 11c, 11c on both sides are easily engaged with the annular grooves 30a, 31a of the left and right connecting pipes 30, 31. Further, at this time, the rib 15 on the inner peripheral side of the housing 11 engages with the annular engaging groove 21a of the annular rib portion 21 of the elastic packing 20. Next, connecting pipes 30, 31
When a slight force is applied to both of them, the tube end faces 30b, 31b of both of them come into contact with the outer surface of the annular rib portion 21 of the elastic packing 20 from the left and right and are in close contact with each other. Even if a force is applied to face the two connecting pipes 30 and 31, and the pipe end faces 30b and 31b are brought into contact with the elastic packing 20, the rib 15 of the housing 11 fitted to the annular rib portion 21 is being reinforced. The core compensates for rigidity. Therefore, the pipe end faces 30b and 31b of the two connecting pipes 30 and 31
However, the housing 11 does not become excessively large or small by being offset to one side with respect to the center. That is, by abutting the rib 15 (including the annular rib portion 21 of the elastic packing 20) in the center position from the left and right, the two connecting pipes 30 and 31 on both sides are engaged with the housing 11 in equal amounts. Will be done. Further, since the outer surface of the annular rib portion 21 of the elastic packing 20 is in close contact with the respective pipe end surfaces 30b and 31b of the connecting pipes 30 and 31, the end surfaces exposed by cutting are covered and protected.

Since the ribs 15 on the housing 11 side and the annular engagement groove 21a on the elastic packing 20 side are wedge-shaped in cross section, the wedge-shaped rib 15 engages the annular groove 21a in the left-right direction. The effect of elastic expansion is enhanced, and the contact adhesion between the outer surface of the annular rib portion 21 and the tube end surfaces 30b and 31b of the connecting tubes 30 and 31 increases.

In contrast to the first embodiment described above, FIG. 4 shows a second embodiment of the present invention. As described above, the first embodiment has a structure in which the semi-annular rib 15 is integrally provided on the inner peripheral surface of the housing 11.
On the other hand, in the case of the second embodiment, the semi-annular rib portion 16 is separately molded, and the rib portion 16 is bonded to the inner peripheral surface of the housing 11 with an adhesive, or the concave and convex fitting, welding, and baking are performed. The structure is connected by a suitable means such as fitting. The other members are exactly the same as those in the first embodiment, and therefore the same reference numerals are given and their description is omitted.

Moreover, FIG. 5 shows a third embodiment. In this case, the elastic packing 20 shown in the first embodiment is changed in shape. That is, it is a structure in which elastically expandable and contractible bellows-shaped crimp portions 24, 24 are provided on both outer sides of the annular rib portion 21,
By bringing the tube end faces 30b, 31b of the connecting pipes 30, 31 into contact with the crimp portions 24, 24, the crimp portions 24 are contracted by this contact force. Due to the elastic restoring force of the crimped portion 24 that contracts, the connecting pipe 3
This is a structure in which the adhesion of 0 and 31 to the tube end faces 30b and 31 is increased as compared with the case of the first embodiment, and the sealing property is further improved.

FIG. 6 shows a fourth embodiment. In the case of the fourth embodiment, the crimping portion provided on the elastic packing 20 as shown in FIG.
In place of 24, a flange-shaped flange portion 25 is extended to the annular rib portion 21, and the flange portion 25 is brought into contact with the inner peripheral surface of each of the connecting pipes 30 and 31 on both sides and the outer peripheral surface of the pipe end. Seal part 22,
It is a structure in which the pipe end is pinched by the inner and outer circumferences together with 22. As a result, the sealability at the tube end faces 30b and 31b is further enhanced.

Finally, FIG. 7 shows a fifth embodiment. This is an embodiment which should be called a modification of the fourth embodiment shown in FIG. That is,
This is a structure in which the flange portion 25 in the fourth embodiment is separately molded, and the flange member 26 and the partial annular rib portion 21 are joined by fitting the convex portion 26a and the concave portion 21b.

Advantageous Effects As described above, the victoric pipe joint of the present invention has an annular rib (engaging ridge) at the center of the inner peripheral surface of the housing.
Is provided, and the annular engaging groove provided in the annular rib portion of the elastic packing is attached to this rib, and this rib increases the rigidity as a reinforcing core of the elastic packing, and the pipe end surface is provided with the annular rib portion. Can be brought into contact with a sufficient pressing force.
As a result, sufficient adhesion to the pipe end surface can be obtained,
A high sealing property can be secured.

Further, by bringing the respective tube end surfaces of the tube into close contact with the annular rib portion of the elastic packing from both sides, it is possible to make the pair of tubes have a uniform installation length in the housing. That is, it is possible to perform center alignment so that the tube end surface of each tube does not deviate to either one of the centers of the housing.

In particular, in the case of a pipe lined with resin on the inner and outer peripheral surfaces, when the metal or lining layer is exposed on the connection end face due to cutting, the structure protects the end face of the pipe, which is effective in preventing corrosion of the pipe end face. Therefore, it is possible to take thorough measures against red water.

[Brief description of drawings]

1 to 3 show a first embodiment of a victoric pipe joint according to the present invention. FIG. 1 is a sectional side view of a side portion of a connecting portion of a pair of pipes, and FIG. 2 is a sectional side view of an elastic packing. FIG. 3 and FIG. 3 are front cross-sectional views by a partial cross section. FIG. 4 is a sectional side view of a second embodiment of the present invention, FIG. 5 is a sectional side view of a third embodiment, FIG. 6 is a sectional side view of a fourth embodiment, and FIG. The side assembly sectional drawing of 5th Example is shown. FIG. 8 shows a partial perspective view of the housing of the embodiment provided with a chamfer on the mating surface. FIG. 9 shows a partially assembled sectional view of a conventional pipe joint. 10 …… Pipe joint, 11 …… Housing, 15 …… Rib (engaging ridge), 16 …… Rib part, 20 …… Elastic packing, 21 …… Annular rib part, 21a …… Annular engaging groove, 22 …… Seal part, 24 ……
Crimping part, 25 …… flange part, 30, 31 …… pair of connecting pipes,
30a, 31a ... annular grooves (grooves), 30b, 31b ... pipe end faces.

Claims (3)

[Scope of utility model registration request] 1. A pair of semi-annular housings that straddle each end of a pair of connecting pipes and engage with an annular groove provided in each end, and each end of the connecting pipe that is in close contact with the inside of each housing. In a victoric pipe joint that includes an annular elastic packing that holds the sealing property of the connection portion in close contact with the outer peripheral surface of the part, a housing is provided in the center of the inner peripheral surface in the width direction so as to project annularly in the peripheral direction. The elastic packing has a seal portion that is in close contact with the inner peripheral surface of the housing and the outer peripheral surface of the end portion of the connecting pipe on both side edges of the elastic packing, and the annular packing provided in the central portion of the seal portion on both sides. It is characterized in that it has a rib portion, and this annular rib portion is formed with an annular engagement groove to be engaged with the engagement protrusion of the housing, and each pipe end surface of the connecting pipe is brought into close contact with the outer surface of the annular rib portion. Pipe fittings. 2. The pipe joint according to claim 1, wherein the engaging projection of the housing has a wedge-shaped cross section. 3. The pipe joint according to claim 1, wherein chamfered portions are formed on both side edges of the mating surface portions of the pair of housings.