JP5238310B2 - Housing type pipe fitting - Google Patents

Description

  The present invention is applied to various pipes such as water supply, fire extinguishing, cooling water, cold / hot water, drainage, etc., and a gasket is fitted to both pipe ends of the two pipes joined to each other so as to be opposed to each other. And a housing-type pipe joint that seals fluid by tightening with a tightening means such as bolts and nuts.

As this type of housing-type pipe joint, for example, those shown in FIGS. 6 and 7 are known (see, for example, Patent Document 1). The housing type pipe joint is formed on the outer periphery between the circumferential grooves (grooves) 3 and 4 of the pipe end portions 1a and 2a of the pipes 1 and 2 that mutually join the pipe end portions 1a and 2a to each other. A pair of arcuate and sectional groove-shaped housings 6 and 6 are covered with a packing 5, and the flange 6 d of one housing 6 and the flange 6 d of the other housing 6 are tightened by tightening means including a bolt 8 and a nut 9. Thus, the fluid in the pipes 1 and 2 is sealed to prevent the pipes 1 and 2 from being detached from the housings 6 and 6.
The housing 6 includes an arc-shaped central abdominal wall 6a and a pair of side walls 6b and 6c projecting radially inward from both side ends of the central abdominal wall 6a, and pipe ends 1a and 2a of two pipes 1 and 2 and packing. 5 is formed, and flanges 6d and 6d are formed at both ends in the circumferential direction of the central abdominal wall 6a, and one pipe 1 extends radially inward from the inner peripheral end of one side wall 6b. A first fitting protruding wall 11 that fits in the circumferential groove 3 of the second pipe 2 and a second fitting that extends radially inward from the inner circumferential end of the other side wall 6c and fits in the circumferential groove 4 of the other pipe 2 A mating wall 12 is formed.

JP 2003-42360 A

The housing type pipe joint is formed by engaging the first and second fitting projection walls 11 and 12 of the housing 6 with the circumferential grooves 3 and 4 of the pipes 1 and 2 as the bolts 8 and nuts 9 are tightened. The pipes 1 and 2 are prevented from being pulled out from the housings 6 and 6.
However, the housing type pipe joint has elasticity and flexibility due to the clearance between the pipe ends 1a and 2a of the pipes 1 and 2 and the housings 6 and 6, and the gap between the pipe ends 1a and 2a. For this reason, when the internal pressure is applied, the pipe is stretched or meandered, and the hanging metal fittings holding the pipes 1 and 2 are damaged due to the elongation, and the appearance is deteriorated due to the meandering.
In addition, when the pipes 1 and 2 are joined to each other with the housing-type pipe joint, the shaft cores are aligned using a hanging fitting or the like so that the pipes 1 and 2 are not misaligned or inclined. Centering work was not easy.

The present invention has been made to solve such problems, and the object of the present invention is to suppress the flexibility of the housing-type pipe joint as described above so that the pipe does not meander during internal pressure loading. An object of the present invention is to provide a housing-type pipe joint that can easily join two pipes in an axially aligned state without misalignment or inclination, thereby improving workability.
Another object of the present invention is to provide a housing-type pipe joint that can prevent the pipe from expanding and contracting when an internal pressure is applied, and that can prevent breakage of the pipe hanging bracket.

As described in claim 1, the present invention will be described with reference to the reference numerals attached to FIGS. 1 to 3 for easy understanding of the contents of the invention. Circumferential grooves 28 and 29 are formed on the outer periphery. A pair of arcuate and cross-sectionally grooved housings 20 that are placed on the outer circumferences of the pipe ends 26a, 27a of the two pipes 26, 27 that join the pipe ends 26a, 27a in a mutually opposing manner via the packing 24. , 20, and the housing 20 is formed by an arc-shaped central abdominal wall 20 a and a pair of side walls 20 b, 20 c projecting radially inward from both ends of the central abdominal wall 20 a and both pipe ends 26 a, 27 a and packing 24. And the flanges 20d and 20d are formed at both ends in the circumferential direction of the central abdominal wall portion 20a, and extends radially inward from the inner peripheral end of the one side wall 20b. Circumferential groove 8 and a second fitting projection wall 32 extending radially inward from the inner circumferential end of the other side wall 20c and fitting into the circumferential groove 29 of the other pipe 27. In the housing-type pipe joint, the flanges 20d and 20d of the pair of housings 20 and 20 that are opposed to each other are fastened by fastening means 23 including bolts 21 and nuts 22 and the like. Of these, one end of the connecting annular body 25 is provided on the inner peripheral surface of the pipe end 26 a of one pipe 26, and the other end of the connecting annular body 25 is provided on the inner peripheral surface of the pipe end 27 a of the other pipe 27. The projecting end face 31c of the first fitting projecting wall 31 where the projecting end face 31a and the inner side face 31b meet is an entrance angle part on the side close to the pipe end face 26b in the circumferential groove 28 of one pipe 26. 28a or in the vicinity of the corner 28a, the second fitting An exit corner 32c where the projecting end surface 32a of the projecting wall 32 and the inner surface 32b meet is at an entrance angle 29a near the tube end surface 27b in the circumferential groove 29 of the other pipe 27 or in the vicinity of the entrance angle 29a. While being engaged with each other, both ends of the connecting annular body 25 are bulging formed at portions corresponding to the inner diameter sides of the circumferential grooves 28 and 29 on the inner peripheral surfaces of the pipe end portions 26a and 27a, respectively. It is characterized in that it is abutted against the end portions 33a, 34a on the tube end face side of the portions 33, 34 .
According to such a configuration, since the pipes 26 and 27 are kept straightly connected by the connecting annular body 25, the flexibility of the pipes 26 and 27 is suppressed, and the pipes 26 and 27 are subjected to an internal pressure load. Does not meander.
Further, when joining the two pipes 26 and 27, one end of the connection annular body 25 is fitted into the inner peripheral surface of the pipe end 26a of one pipe 26, and then the pipe end 27a of the other pipe 27 is connected. By fitting the other end of the annular body 25, the pipes 26 and 27 can be easily aligned with each other without any misalignment or inclination.

According to the configuration of this, at the time of rise of the water pressure in the pipe 26, 27, Izusumi portion 31c of the first and second fitting projections 31 and 32, 32c and inlet corner 28a of the circumferential groove 28, 29, and 29a It is possible to prevent the pipes 26 and 27 from extending due to the engaging action. At the time of pressure reduction in the pipes 26 and 27, both ends of the connecting annular body 25 are piped by an action in which the pipe end face side end portions 33a and 34a of the bulging portions 33 and 34 in both pipe end portions 26a and 27a are abutted. 26 and 27 can be prevented from shrinking.

  ADVANTAGE OF THE INVENTION According to this invention, flexibility can be suppressed and the housing type pipe joint which piping does not meander at the time of internal pressure load can be provided. In addition, the two pipes can be easily joined to each other in an axially aligned state without misalignment or inclination, and workability can be improved.

  A preferred embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a half-sectional view of a housing-type pipe joint according to an embodiment of the present invention, FIG. 2 is a side view of the housing-type pipe joint, FIG. 3 is an enlarged view of the main part in FIG. (C) is a half-broken cross-sectional view showing the setting process of the connecting annular body and packing.

  1 to 3, a housing-type pipe joint includes a pair of arc-shaped housings 20, 20, tightening means 23 including a bolt 21 and a nut 22 for tightening ends of the housings 20, 20, and a housing 20. A packing 24 to be accommodated and a connecting annular body 25 are provided.

  The pipes 26 and 27 to be joined by the pipe joint are made of stainless steel pipes or steel pipes, and the pipe ends 26a and 27a of the pipes 26 and 27 are provided with circumferential grooves (grooves) 28 and 29, respectively, on the pipe end faces 26b and 27b. Is formed by roll rolling or the like at a predetermined distance. The packing 24 is a self-sealing type formed in a ring shape with a lip groove shape in cross section, and is made of synthetic rubber or the like.

  The housing 20 includes an arc-shaped central abdominal wall 20a and a pair of side walls 20b and 20c projecting radially inward from both side ends of the central abdominal wall 20a. And the flanges 20d and 20d are formed at both ends of the central abdominal wall portion 20a in the circumferential direction, and extend radially inward from the inner peripheral end of the one side wall 20b. A first fitting protrusion 31 that fits into the circumferential groove 28 and a second fitting that extends radially inward from the inner peripheral end of the other side wall 20c and fits into the circumferential groove 29 of the other pipe 27 A protruding wall 32 is formed.

The connecting annular body 25 is made of a stainless steel pipe, a steel pipe or the like, and is formed in a circular cross section or a ring shape having a C cross section as shown in FIG. 5, and is almost formed on the inner peripheral surfaces of the pipe ends 26a and 27a of the pipes 26 and 27. It has an outer diameter that can be fitted without a gap.
One end of the connecting annular member 25 is radially inward at the same time as the formation of the circumferential groove 28 at a portion corresponding to the inner diameter side of the circumferential groove 28 on the inner peripheral surface of the pipe end 26 a of one pipe 26. It is fitted until it hits the tube end surface side end portion 33a of the bulging portion 33 formed in a bulging shape. In the connecting annular body 25 protruding from the pipe end portion 26a, the pipe end portion 27a of the other pipe 27 corresponds to the inner diameter side of the circumferential groove 29 on the inner peripheral surface of the pipe end portion 27a. And is inserted into the tube end surface side end portion 34a of the bulging portion 34 formed so as to bulge inward in the radial direction simultaneously with the formation of the circumferential groove 29 until the other end portion of the connecting annular body 25 abuts. The ends 26a and 27a are opposed to each other in an axial alignment state so as to face each other with a gap g. That is, the length L of the connecting annular body 25 is the tube end side end of the bulging portions 33, 34 on the inner peripheral surfaces of the pipe end portions 26a, 27a of the pipes 26, 27 facing each other with a gap g. It is set approximately equal to the interval B between the portions 33a and 34a.

  In the housing 20, as shown in FIG. 3, the corner portion 31 c where the projecting end surface 31 a of the first fitting projecting wall 31 meets the inner surface 31 b on one side wall 20 b is a circumferential groove 28 of one pipe 26. An angle-of-incidence portion 32c where the projecting end surface 32a of the second fitting projection wall 32 and the inner side surface 32b meet on the other side wall 20c near the angle-of-incidence portion 28a on the side close to the tube end surface 26b. The other pipe 27 is configured to be engaged with the entrance angle portion 29a on the side close to the tube end surface 27b of the circumferential groove 29 or in the vicinity of the entrance angle portion 29a.

  Next, the usage aspect of the housing type pipe joint of the said structure is demonstrated.

  First, as shown in FIG. 4A, the connecting annular body 25 is connected to the inner peripheral surface of the pipe end 26a of one of the two pipes 26 and 27, and one end of the pipe end 26a is connected to the pipe end 26a. It fits in until it hits the pipe end surface side end portion 33a of the bulging portion 33 on the inner peripheral surface.

  Next, as shown in FIG. 4B, the pipe end 27a of the other pipe 27 is connected to the connecting annular body 25 projecting from the pipe end 26a of the pipe 26 to the inner peripheral surface of the pipe end 27a. It fits in until the other end part of the annular body 25 for connection contacts the pipe end surface side edge part 34a of the bulging part 34. As a result, the pipe ends 26a and 27a are abutted in an axial alignment state so as to face each other with a gap g. Thus, when joining the two pipes 26 and 27, one end of the connecting annular body 25 is fitted into the inner peripheral surface of one pipe end 26a, and then the other pipe end 27a is connected to the connecting annular body 25. By fitting the other end, the pipes 26 and 27 can be easily faced to each other in an axially aligned state without misalignment or inclination, and the centering operation can be easily performed.

  Next, as shown in FIG. 4C, the packing 24 set in advance on one pipe end portion 26a is moved toward the other pipe end portion 27a so as to evenly straddle both pipe end portions 26a and 27a. Set correctly.

  Next, as shown in FIG. 1, the housings 20, 20 are covered from above the packing 24 to accommodate the pipe end portions 26 a, 27 a and the packing 24 in the concave grooves 30, and the first side wall 20 b is first. The fitting projection wall 31 is fitted into the circumferential groove 28 of one pipe 26, and the second fitting projection wall 32 of the other side wall 20 c is fitted into the circumferential groove 29 of the other pipe 27.

  Finally, as shown in FIG. 2, the flanges 20 d and 20 d facing each other of the housings 20 and 20 are fastened by fastening means 23 including bolts 21 and nuts 22. The bolt 21 and the nut 22 are tightened to obtain a sealed state that prevents fluid from leaking from the pipe ends 26a and 27a of the pipes 26 and 27, and as shown in FIG. The exit corner 31 c is in the vicinity of the entrance corner 28 a of the circumferential groove 28 of one pipe 26, and the exit corner 32 c of the second fitting protrusion 32 is in the vicinity of the entrance corner 29 a of the circumferential groove 29 of the other pipe 27. A state of being engaged with each other strongly is obtained. At the same time, one end of the connecting annular member 25 is connected to the tube end surface side end 33a of the bulging portion 33 in one tube end 26a, and the other end of the connecting annular member 25 is connected to the other tube end 27a. A state is obtained in which the tube end surface side end portion 34a of the bulging portion 34 abuts and engages strongly. Therefore, when the water pressure in the pipes 26 and 27 is increased or reduced, the pipes 26 and 27 can be sufficiently prevented from expanding or contracting, and the hanging bracket 35 for hanging the pipes 26 and 27 (FIG. 4A). Can be prevented from being damaged.

  Since the pipes 26 and 27 are kept straightly connected by the connecting annular body 25, the flexibility of the pipes 26 and 27 is suppressed, and the pipes 26 and 27 do not meander when the internal pressure is applied. Can be secured.

It is a half notched sectional view of a housing-type pipe joint according to an embodiment of the present invention. It is a side view of the housing type pipe joint. It is an enlarged view of the principal part in FIG. (A)-(c) is a half notched cross-sectional view which shows the setting process of the annular body for connection and packing. It is a perspective view which shows the cyclic | annular body for a connection of another Example. It is a half notched cross-sectional view of a housing type pipe joint of a conventional example. It is a side view of the housing type pipe joint of FIG.

20 Housing 20a Central abdominal wall 20b, 20c Side wall 20d Flange 21 Bolt 22 Nut 23 Tightening means 24 Packing 25 Connection annular body 26, 27 Piping 26a, 27a Pipe end 26b, 27b Pipe end face 28, 29 Circumferential groove 28a, 29a Corner part 30 Groove 31 First fitting protrusion 32 Second fitting protrusion 31c, 32c Outer corner part

Claims (1)

A pair of arc-shaped and cross-sectional groove-shaped housings are provided on the outer circumferences of the pipe ends of the two pipes that join the pipe ends having circumferential grooves formed on the outer circumference in a mutually opposing manner, through packing, This housing forms a concave groove that accommodates both pipe ends of the two pipes and the packing by an arc-shaped central abdominal wall and a pair of side walls projecting radially inward from both side ends of the central abdominal wall, And while forming a flange in the circumferential direction both ends of the central abdominal wall portion, a first fitting projection wall extending radially inward from the inner circumferential end of one side wall and fitting into a circumferential groove of one pipe, A second fitting projecting wall extending radially inward from the inner peripheral end of the other side wall and fitting into a circumferential groove of the other pipe; and A screw that is tightened with a tightening means such as a nut. In managing type joint,
One end of the connecting annular body is provided on the inner peripheral surface of the pipe end of one of the two pipes, and the other end of the connecting annular body is provided on the inner peripheral surface of the pipe end of the other pipe. Fitted ,
The exit corner portion where the projecting end surface and the inner surface of the first fitting projecting wall meet is located at or near the entrance angle portion on the side close to the tube end surface in the circumferential groove of one pipe. While the projecting end face of the fitting projecting wall meets the inner corner of the projecting corner, the corner of the other pipe is engaged with the corner near the pipe end in the circumferential groove, or near the corner, Both ends of the connecting annular body are butted against the end portions on the tube end surface side of the bulging portions respectively formed on the inner peripheral surfaces of the both tube end portions corresponding to the inner diameter side of the circumferential groove . A housing-type pipe joint.

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