JP3145106B2 - Metal pipe fittings and connection methods - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a metal pipe joint having a simple structure, and further relates to a metal pipe connection method capable of performing a prescribed pipe work even in a limited place.

(Prior Art) In order to connect a large-diameter metal pipe, a flange-type connection method is generally used in consideration of the mechanical strength of the pipe connection part, the workability of piping, and the like. Flange type fittings
A flange member is inserted into the end of the pipe in a socket type or a slip-on type, and thereafter, the flange member is fixed to the pipe by welding. In this pipe joint, it is not easy to match the bolt holes of the flange member at the time of piping, and the bolt holes must be aligned even if the pipe is forcibly twisted, which causes a delay in piping work and a cause of pipe damage. become. For this reason, the lap joy-type flange member is fitted to the pipe, and the stub end is welded to the end of the pipe, so that the flange member can be freely turned at the time of bolt connection.

(Problems to be Solved by the Invention) In the flange type pipe joining method, the diameter of the flange member is generally large even if the flange member is a wrap joy type flange member.
In a limited piping area, the flange member hinders the pipe connecting portion from being piped as prescribed, and the pipe may be curved. In this case, if the ends are butt-welded or screwed together using a socket, nipple, bushing, etc., the piping can be made as specified, but the pressure resistance and mechanical strength of the pipe connection and the large diameter pipe In many cases, it cannot be used due to the workability of piping.

The present invention has been proposed in order to improve the above-mentioned problems relating to conventional pipe joints, and is a metal pipe having a simple structure, easy installation, and a pipe joint having a predetermined pressure resistance and mechanical strength. The purpose of this is to provide a joint. Another object of the present invention is to provide a method for connecting metal pipes that can be piped uniformly even in a limited pipe area.

(Means for Solving the Problems) In order to achieve the above object, the joint 1 according to the present invention includes:
As shown in FIGS. 1 and 2, the housing members 4, 4 having substantially semicircular annular side surfaces surrounding the flange portions 3, 3 of the metal pipes 2 are provided.
And a circular packing 5 disposed between the flanges 3 and 3, and two sets of bolts and nuts 6 and 6 penetrating through the linear extensions of both housing members. Generally, the metal pipe 2 may be made of a large diameter stainless steel or steel, and the housing member 4 may be made of steel. With respect to the housing member 4, its sides are slightly smaller than the full semi-circular ring, its outer diameter is larger than the diameter of the collar 3 and its inner diameter is
Smaller than the diameter of. As shown in FIG. 1, the cross section of the housing member 4 has both inner surfaces extending outward toward the center, and this embodiment may be entirely arcuate as shown in FIG. Instead of forming such a spread, a circular tapered member 7 (FIG. 4) may be provided, and this may be arranged in contact with the rear of the collar portion. As shown in FIG. 5, the metal pipe may be formed with a bulging end 8, in which case housing members 9, 9 having substantially semicircular sides surrounding the bulging end, And a thick annular packing 10 disposed around the two bulging ends and two sets of bolts and nuts 11 (see FIG. 6) penetrating the linear extensions of both housing members. The housing member 9 has a lateral width whose both ends exceed the bulging end 8 of the metal pipe and reach a normal diameter portion.

In the connection method according to the present invention, as shown in FIG. 7, a lap joy-shaped flange member 12 is fitted to both metal pipes 2 and then the end of the metal pipe 2 is processed to form a flange portion 3. Or by swelling to form the swelling end 8. At the end of the pipe 2,2, two flange members 1
Position 2 and 12 and bolt and nut 13 to flange member
After the joints 12 and 12 are joined and temporarily assembled, a joint having a housing member having a substantially semicircular side may be used instead of the two flange members, and the packing 5 or 10 may be crimped or pressed by the joint.

(Operation) In the joint 1 according to the present invention, the housing members 4 and 4 are connected to each other in a circular annular shape with bolts and nuts 6 and 6 and tightened. 5 is pressed to maintain airtightness. When the bulging end 8 is formed in place of the flange 4, the two metal pipes are held by the housing members 9, 9 and the annular packing 10 is pressed down to maintain the airtightness. In the method of the present invention, since the packing is crimped or pressed by the joint after temporarily assembling with the wrap joy-type flange members 12, 12, the outer diameter of the joint is smaller than that of the flange member 12, The pipe connection can be piped as specified in the limited pipe area.

(Embodiment) The present invention will be described with reference to the drawings. A joint 1 according to the present invention is a housing member 4, 4 having a substantially semicircular annular side surface surrounding a metal pipe 2 and flanges 3, 3. From both ends, a linear extension 20 (FIG. 2) is formed horizontally. The steel housing member 4 has a length of 90 mm, for example.
mm, the height is 44 mm, and the total length including the extensions 20, 20 is 134 mm. The cross section of the housing member 4 is substantially inverted U-shaped, as is both extensions 20. Housing member 4
As shown in FIG. 1, the inner side surfaces 21 and 21 extend outward toward the center as shown in FIG. The two extension portions 20 are provided with through holes, respectively, and bolts and nuts 6 are inserted into opposed through holes of both housing members to assemble the joint 1.

In the connection method of the present invention, the metal pipe 2 used is a stainless steel pipe, for example, having a diameter of 6 cm and a length of 5.5 m. As shown in FIG. 7, the wrap joy-shaped flange members 12, 12 used for temporary assembly are made of steel, and have a center hole of about 6.2 cm. After fitting the synthetic rubber ring band 24 and the flange member 12 to the end of the pipe 2,
The end of the stainless steel pipe 2 is formed by a known boring machine to form a brim portion 3, and then the other end of the pipe is processed in the same manner. The pipe 2 may be transported or stored at the piping site after the above processing is completed at the factory. At the piping site, close the ends of pipes 2, 2 arranged vertically or in an inclined direction, and close the two flange members 1
In this case, the ring band 24 is folded in half and arranged just behind the flange member 12 as shown in FIG. 8, and the flange member 12 is heavy due to the elasticity of the ring band. Also prevent its falling and slippage. next,
After the circular packing 5 is interposed between the end faces of the flanges of both the pipes 2, the two flange members 12, 12 are connected by bolts and nuts 13. The ring band 24 to be used can form uneven inner surfaces of various shapes to prevent slippage. For example, a plurality of circular protrusions are formed on the inner surface, or a V-shaped annular groove is provided in the middle in the axial direction, and the two are easily folded in the axial direction at the location of the annular groove. Further, if a plurality of slits extending from the front peripheral end of the ring band to the middle in the axial direction are formed at equal intervals in the circumferential direction, in order to hold a large and heavy flange member, even if the ring band is considerably thick, When each slit is pushed open, it can be folded in two in the axial direction. When the temporary assembly work is completed, it is necessary to temporarily fix the pipe 2 to a wall surface or the like. During this temporary fixing operation, the ring band 24 is moved along the peripheral surface of the pipe to a position where the fixing bracket 26 such as a U-bolt is attached, and stops inside the fixing bracket. Next, tighten the fixing bracket 26,
Temporarily fix 2.

After temporarily fixing the pipes 2, 2, remove the bolts and nuts 13,
The two flange members 12, 12 are detached. Flange members 12,12
Can be easily detached from the pipe 3 after temporary storage if it can be disassembled. Further, if the other end of the pipe is unprocessed, it may be removed therefrom, and if it is a thin flange member dedicated to temporary assembly, it may be cut and removed. Thereafter, as shown in FIG. 9, a bolt and a nut 11 are attached to one of the extension portions 20 and 20 of the housing members 4 and 4 of the joint 1, and are disposed so as to surround the flange portions 3 and 3 of the two metal pipes 2. . The housing members 4, 4 are brought close to each other as shown by a dashed line in FIG. 9, and bolts and nuts 11 are also attached to the other extensions 20 and 20. When the two sets of bolts and nuts 11 are strongly tightened, the inner surfaces 21, 21 expand outward toward the center in the cross section of the housing member 4. The packing 5 is strongly pressed between the flanges 3 and 3 to maintain airtightness. Finally, tighten the fixing brackets 26, 26, and when the pipes 2, 2 are completely fixed, the rubber ring band 24
Is interposed between the inner surface of the fixture 26 and the outer peripheral surface of the pipe 2, and electrically insulates the fixture from the pipe 2. The outer diameter of the housing members 4 and 4 of the joint 1 is considerably smaller than that of the flange member 12 so that the pipe joints can be straightened or formed at a prescribed angle even in a limited piping area such as a corner of a wall surface. Can be plumbed.

In order to maintain the airtightness by pressing the packing 5, the entire cross section of the housing member 30 may be arc-shaped as shown in FIG. Further, instead of the two inner surfaces of the housing member expanding outward, the circular taper members 7 are arranged in contact with the rear of the flange portion 3 as shown in FIG. May be attached.

The joint 35 shown in FIG.
The housing members 9, 9 having substantially semicircular sides surrounding the housing member, the rubber annular packing 10 disposed around the two bulging ends inside the housing member, and the linear extension portions 37 of both housing members 9 are provided. It consists of two sets of bolts and nuts 11 that penetrate. The steel housing member 9 has a length of, for example, 100 mm and a height of 46 mm, and has a total length of 150 mm including the extensions 37, 37. The width of the housing member 9 is 68 mm, and both ends thereof
38, 38 reach the normal diameter portion beyond the bulging end 8 of the metal pipe 36. The housing member 9 is formed with a semicircular side recess which communicates with both ends 38, 38 on the flat surface, and comprises a central recess 39 and both side recesses 40, 40. Central dent 39
Is, for example, 25 mm in width and 88 mm in diameter, and the annular packing 10
Can be fitted. The recesses 40 on both sides have a diameter of 68 mm on the recess 39 side and a diameter of 60 mm on the side end 38 side. When the bulging end portion 8 of the pipe 36 is fitted, the pipe 36 is fixed by the circular connection of the two flange members 9, 9. it can.

In the case of the joint 35, the metal pipe 36 used is a stainless steel pipe, for example, having a diameter of 60 mm. Metal pipe 36
After fitting a ring member and a flange member, the end of the metal pipe 2 is bulged by an outer diameter of 68 mm and a width of 16 mm. This bulging process may be performed, for example, by forming a bulged end 8 by pushing a shell-type plug into the end of the pipe heated and energized at a pipe processing factory or a piping site. pipe
After fitting the annular packing 10 between 36 and 36, it is temporarily assembled with a flange member as in the above-described embodiment. After the pipes 36, 36 are temporarily fixed, the flange members are detached, and then the bolts and nuts 11 are attached to the extension portions 37 of the housing members 9, 9, respectively. The housing members 9, 9 are connected in a circular shape by bolts and nuts 11, 11, and the bulging ends 8, 8 of both metal pipes 36 are connected.
And the annular packing 10 is arranged. When two sets of bolts and nuts 11 are strongly tightened, both housing members 9,
The swelling ends 8, 8 of both metal pipes 36 are held by 9 and the annular packing 10 is pressed down to maintain airtightness.

(Effects of the Invention) In the joint according to the present invention, the two housing members are simply connected and tightened in a circular shape with two sets of bolts and nuts, and the flanges or the bulging ends of the metal pipes are formed by the two housing members. In order to maintain airtightness, the structure is simple and piping work is easy, and almost no water leakage accidents occur. According to the connection method of the present invention, the packing is crimped or pressed down by the joint of the present invention after temporarily assembling with the wrap joy-shaped flange member. Since the outer diameter of this joint is smaller than that of the flange member, even in a limited piping area, the pipe is not bent by the flange member, and the pipe connection portion is formed in a straight line or at a right angle as prescribed. Can be plumbed. Further, according to the connection method of the present invention, since the pipe itself only swells or bulges its end without performing any welding or the like, the working operation is simple and quick, and the pipe is made of stainless steel. However, no electrolytic corrosion occurs at the pipe joint.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of a pipe showing a joint according to the present invention,
2 is a side view of the joint shown in FIG. 1, FIGS. 3 and 4 are partial cross-sectional views each showing a modification of the present invention, and FIG. 5 is a partial cross-section of a pipe showing another modification of the present invention. Fig. 6, Fig. 6 is a side view of the joint of Fig. 5, Fig. 7 is a partial cross-sectional view of a pipe end showing a temporarily assembled state by a flange member, and Fig. 8 is a cross-sectional view of a ring band arranged behind the flange member. FIG. 9 is a side view showing a fitting order of the joint of the present invention. 1 ... joint, 2 ... metal pipe, 3 ... pipe flange,
4 ... housing member, 5 ... packing, 6 ... bolt and nut, 12 ... flange member, 13 ... bolt and nut.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16L 21/00 F16L 21/06 F16L 23/02

Claims (4)

(57) [Claims] 1. A joint for positioning a wrap joy-shaped flange member fitted to an end of a pipe, temporarily assembling the two flange members to temporarily fix the pipe, and then detaching and mounting the two flange portions. And two housing members having substantially semicircular side surfaces surrounding the flange portions of both metal pipes and having an arc-shaped cross section as a whole, a circular packing disposed between the two flange portions, and a linear shape of both housing members. It consists of two sets of bolts and nuts penetrating the extension, and in the cross section of the housing member, both inner side surfaces are spread outward toward the center, so that the two sets of bolts and nuts are used to make both flange members circular. A metal pipe joint which can be connected and tightened, and the outer diameter of a housing member is smaller than that of a flange member, so that a pipe connection portion can be piped in a limited pipe area as prescribed. 2. A joint for positioning a wrap joy-shaped flange member fitted to an end of a pipe, temporarily assembling the two flange members to temporarily fix the pipe, and then detaching and mounting the two flange portions. And two housing members having substantially semicircular sides surrounding the flanges of the metal pipes, a circular packing disposed between the two flanges, a circular taper member disposed behind and in contact with each flange, and both housing members. The two flanges are connected to each other in a circular shape by two sets of bolts and nuts, comprising two sets of bolts and nuts penetrating through the linear extension of the tapered member. A metal pipe joint that allows a pipe joint to be piped in a limited pipe area as specified by the outer diameter of the housing member being smaller than that of the flange member. 3. A joint for positioning a wrap joy-shaped flange member fitted to an end of a pipe, temporarily assembling the two flange members to temporarily fix the pipe, and then detaching the two flange portions for mounting. Two housing members having substantially semicircular sides surrounding the bulging ends of the metal pipes, an annular packing fitted in an inner recess of the housing member and disposed around the bulging ends, and both housings. It consists of two sets of bolts and nuts that penetrate the linear extension of the member. When the two sets of bolts and nuts are used to join the two flange members in a circular shape and tighten them, the two housing members directly press the annular packing and seal it tightly. A metal pipe fitting that maintains its character. 4. A lap joy-shaped flange member is fitted to a metal pipe, and the ends of the metal pipe are bulged or bulged to position two flange members at the ends of both pipes. At that time, place the ring band immediately behind the flange member, prevent the flange member from falling or slipping by the tightening elasticity of the ring band, combine the two flange members with bolts and nuts, and temporarily assemble them. After detaching the flange member, using a joint having a housing member having a substantially semicircular side surface, attaching bolts and nuts to both extensions of the housing member of the joint, crimping the packing by tightening two sets of bolts and nuts Alternatively, a method of connecting a metal pipe in which a pipe joint is laid as specified in a restricted and limited piping area.