JP2000310379A - Joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To certainly carry out sealing treatment and facilitate connecting work. SOLUTION: This joint is constituted of a butt member 3 furnished with a base end part 3B having an externally fitting part free to externally fit end parts of a flange part 3A and a pipe 1 to specified positions, an exterior member 4 to cover the flange parts 3A, 3A of the both butt members and the end parts of the two butted pipes 1, 1 from the diametrical directions of the pipes in a state where the butt members on which the pipes 1, 1 are externally fitted are butted to each other and a fastener to operate the flange parts to the side for them to approach each other by operating the exterior member 4 in the diametrically contracting direction and to pressurize, fix and operate the end parts of the pipes on outer surfaces of the base end parts of the butt members. The fastener is constituted free to fasten and operate from above.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe for connecting fluids such as an air supply pipe, a water supply pipe, a gasoline hose, a chemical hose, an oil-resistant hose, and the like, which are used for abutting each other. For joints.

[0002]

2. Description of the Related Art As shown in FIGS. 13 (a) and 13 (b), for example, as shown in FIGS.
A cylindrical body 21 having a flange portion 21A at the tip and an external thread portion 21B on the outer surface is screwed and fixed, and the flange portions 21A and 21A of the two screwed and fixed cylindrical bodies 21 and 21 are abutted against each other. After, both flanges 2
The through holes 21a, 21a formed at appropriate intervals in the circumferential direction of 1A, 21A are aligned in the tube axis direction. Next, the bolt 2 is inserted into these many through holes 21a, 21a from the tube axis direction.
Then, the nut 23 is screwed into the tip of the bolt 22 after the hole 2 is passed through, so that the flange portions 21A, 21A can be connected and fixed in a sealed state. 24 is a rubber packing.

In the above connection method, both flange portions 21A,
In order to uniformly apply the tightening force of 21A in the circumferential direction, a large number of bolts 22 must be tightened, and the connecting operation is troublesome and troublesome.
Further, particularly when the pipe is disposed on the floor in a gap where a large number of machines and devices are disposed, if the through-hole 21a is in the pipe axis direction as described above, the pipe is particularly close to the floor. In order for the bolt 22 to penetrate through the through-hole 21a located below, it must be performed not only in an unstable posture in which the upper body of the body protrudes to near the floor, but also in the unstable posture. However, the connecting operation becomes more troublesome and troublesome, and there is room for improvement. Also, since the flanges 21A, 21A are tightened to seal against the fluid to be pumped,
Inevitably, the A and 21A are inevitably increased in size, causing an increase in the weight of the tubular body 21, making it difficult to abut the flanges 21A and 21A, and conspicuous the above-mentioned inconvenience.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above situation, and has as its object to provide a joint which can reliably perform a sealing process and can easily perform a connecting operation.

[0005]

SUMMARY OF THE INVENTION The present invention, in order to solve the above-mentioned problems, is a joint for connecting pipes adjacent in the pipe axis direction with their one ends abutting each other, A butt member having a distal end portion having a flange portion that can be abutted at one end, and a proximal end portion having an outer fitting portion capable of externally fitting an end portion of the tube to a predetermined position at the other end; In a state where the butting members fitted to each other are butt against each other, an outer member for covering the flange portions of the two butting members and the ends of the two butted tubes from the diametric direction of the tubes, and A clamping tool for operating the flange portions to approach each other and pressing and fixing the end of the pipe to the outer surface of the base end of the butting member. Tool operation from above It is configured to function. Therefore, after the one end of the pipe is externally fitted to the outer fitting portion of the butting member, the butting members are butted against each other. In this state, after covering the outer member with the flange portion of the butting member and the ends of the two tubes from the diametric direction of the tubes, the tightening operation of the fastener is easily performed from above, and the ends of the adjacent tubes are joined together. Can be completed. In addition, since the outer member covers the flange portion of the butting member and the ends of the two tubes, the shape retention strength at the flange portion and the ends of the two tubes can be increased, and the flange portion can be increased as in the conventional case. As compared with the one that secures the shape-retaining strength alone, the size and weight of the flange portion can be reduced, and the work of abutting the flange portions can be performed lightly.

The inner surface of the tube is formed flat, and the inner surface of the tube whose end is externally fitted to the butting member and the inner surface of the butting member are flush with each other in the axial direction of the tube. The fluid flowing inside can be caused to flow with low resistance over the entire flow path.

The exterior member comprises a pair of upper and lower half-members having a semicircular cross-sectional shape in which a groove portion into which the flange portions of the butting member are abutted is formed. Bolts are provided at both ends of the split member for connecting the two half members, and bolts penetrate through vertical through holes formed in the flange portions at both ends of the pair of upper and lower half members. By configuring the tightening tool from the nut screwed to the tip of the bolt, it is possible to use only the minimum necessary number of half members, but only by tightening both ends with general-purpose bolts and nuts The pair of upper and lower half members can uniformly tighten the flange portion.

A base end surface of the flange portion is formed in a tapered surface located closer to the base end side toward the inner side in the radial direction of the pipe, and when the flange portions are abutted, the tapered surfaces of the flange portions are brought closer to each other. By forming a tapered surface for pressing operation on the groove formed in the pair of upper and lower half members, it is possible not only to convert the tightening force to the tightening force of the flange portion but also to incline the inclination angles of the tapered surfaces. By simply changing the pressure, the tightening force of the flange portion can be adjusted.

A crimping member for elastically pressing the end of the tube against the outer surface of the base end of the butting member on both sides in the axial direction of the tube among the inner surfaces of the pair of upper and lower half members. A concave portion into which the portion enters is formed. That is, by tightening the half-split member with a small operating force enough to elastically deform the crimping member, it is possible to prevent the pipe from coming off the butting member by using the restoring force of the crimping member. In addition, by inserting a part of the caulking member into the concave portion, the caulking member does not unexpectedly move with respect to the half member, and the caulking member reliably acts on the outer surface of the base end portion of the butting member. Can be done.

[0010] The tube is formed into a corrugated shape having a helical uneven portion on an outer surface, and a coil spring is wound around a concave portion at an end of the corrugated tube, and the end of the tube around which the coil spring is wound is attached to the tube. A coil whose diameter has been expanded to press the end of the tube against the outer surface of the base end of the butting member by externally fitting the outer fitting portion of the butting member having an outer diameter larger than the inner diameter of the coil spring. The elastic restoring force of the spring can be used, so that the tube can be more reliably prevented from coming off the butting member, and also the shape retention strength of the end of the tube can be increased.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a state immediately before one ends of pipes 1 and 1 used for sending a fluid are connected by a joint 2. These pipes 1 and 1 are attached to a fixing member (not shown) fixed to the floor surface, and may be installed anywhere, such as a position slightly above the floor surface or buried in the ground. .

The tube 1 is made of synthetic resin (rubber may be used), which is advantageous for weight reduction, but may be metal or ceramic. As shown in FIG. 2, the tube 1 has a cylindrical tube body 1A having an inner surface 1a formed flat.
And a corrugated shape having a circular cross section provided on the outer surface of the tube main body 1A by heat fusion or the like and having an uneven shape having a helical projection 1B, while reducing the weight. Although the shape retention strength of the tube 1 can be increased, the outer surface of the tube 1 may be formed flat as shown in FIG. Although 1C shown in FIG. 7 is a core buried inside the pipe 1, the core 1C may not be provided. Further, the tube main body 1A and the projection 1B shown in FIG. 2 may be integrally formed.

As shown in FIGS. 1 and 2, the joint 2 has butting members 3, 3 attached to one ends of the tubes 1, 1, respectively, and a flange formed at the tip of the butting members 3, 3. An exterior member 4 for covering 3A, 3A and the ends of the two tubes 1, 1 and operating the exterior member 4 in the radially-reducing direction to press the flange portions 3A, 3A toward each other. The fastening tool 5 for connecting in close contact is a main component.

Since the butting members 3 and 3 are the same, one of the butting members 3 will be described. One end of the butting member 3 is in surface contact with the other butting member 3 as shown in FIGS. A flange portion 3A constituting a tip portion having a possible flat tip surface 3a;
Has a cylindrical outer fitting portion 3b having an outer diameter substantially the same as the inner diameter of the tube 1 so that one end of the tube 1 can be fitted to the outside, and an end face of the tube 1 for regulating the outside fitting position of the tube 1. End portion 3B having an annular receiving portion 3c for receiving a spring, and a cylindrical intermediate portion 3C located between the flange portion 3A and the base end portion 3B.
Thus, the butting member 3 is formed.
The two parts may be integrally formed of a synthetic resin (or may be made of rubber), or may be formed of metal, ceramic, or the like.

An O-ring 7 made of rubber, synthetic resin, or the like is provided at a substantially radially intermediate portion of the distal end surface 3a of the flange portion 3A.
An annular groove 3M is formed to allow a part of the O-ring 7 to enter, and the O-ring 7 is elastically deformed by abutting the flange portions 3A and 3A and operating them toward each other, thereby sealing the two. Processing is performed.
The shape of the O-ring 7 is not limited to that shown in the figure. Further, when the butting member 3 is formed of hard rubber or the like, there is an advantage that the O-ring 7 can be made unnecessary by integrally forming the seal portion with the butting member 3.

The other end surface 3T of the flange portion 3A is formed in a tapered surface located closer to the base end side toward the inner side in the radial direction of the pipe, and the flange portion 3A is brought into contact with the flange portion 3A. Tapered surfaces 6T for pressing the tapered surfaces 3T, 3T of the portions 3A, 3A toward mutually approaching sides are formed in grooves 6M, 6M formed in a pair of upper and lower half members 6, 6, which will be described later. Member 3,
3 was tightened from above and below with half-members 6 and 6 described later, the tightening force was converted to a tightening force for tightening the flange portions 3A and 3A toward each other, and the butting members 3 and 3 were butted together. It can be connected and fixed in the state. By changing the inclination angle of at least one of the tapered surfaces 3T, 3T and 6T, 6T, the flange portions 3A, 3T are changed.
The tightening force of A can be adjusted. By forming the tapered surfaces 3T, 3T and 6T, 6T, there is an advantage that the tightening force can be gradually converted to the tightening force of the flange portions 3A, 3A, but one may be formed as a straight surface. The shape of the other end surface 3T of the flange portion 3A and the pressing surfaces of the half members 6, 6 for pressing the other end surface 3T are not limited to those shown in the drawings.

As shown in FIGS. 1, 3 (a) and 3 (b), the exterior member 4 is composed of a pair of upper and lower half members 6 and 6 having a semicircular cross-sectional shape. There are provided flanges 6A, 6A for connecting 6,6. A groove 6M into which the flange portions 3A, 3A in the abutted state can enter is formed substantially at the center of the inner surfaces of the half members 6, 6 in the tube axis direction, and the half members 6, 6 are formed.
A concave portion 6N into which a part of a semicircular caulking member 10 for elastically pressing the end of the tube 1 against the outer surface of the base end portion 3B of the abutting member 3 is inserted into both ends of the inner surface of the inner surface of the tube axis direction.
Is formed. Vertical through-holes 6a are provided at three places (any number of places) in the tube axis direction of each of the flanges 6A, 6A.
The bolt 5 penetrates the six through-holes 6a, and the six nuts 9 screwed into the tips of the bolts 8 penetrated to form the fastener 5. Therefore, the outer fitting portions 3b, 3b of the two flange portions 3A, 3A
After fitting one end of each of the two tubes 1 and 1 to the outside, the two flange portions 3A and 3A are abutted. In this state, two sets of concave portions 6N, 6N, 6 of a pair of upper and lower half members 6, 6 are provided.
After fitting the caulking members 10 (four in total) into the N and 6N, respectively, the half members 6 and 6 are inserted into the grooves 6M and 6M of the half members 6 and 6 so that the flange portions 3A and 3A enter the grooves 6M and 6M. Is placed on both flange portions 3A, 3A from above and below. And
The six bolts 8 are connected to the flanges 6A, 6 at both ends of the half members 6, 6.
A and 6A are respectively penetrated from above through the through holes 6a, 6a, 6a, and nuts 9 are screwed into the tips of the bolts 8 from below. Then, by rotating each bolt 8, the diameter of the half members 6, 6 is reduced. At this time,
The tapered surfaces 6T, 6T formed on the half members 6, 6 press the tapered surfaces 3T, 3T of the flange portions 3A, 3A toward each other, and tighten the flange portions 3A, 3A. Deformed crimping members 10, 10, 1
Due to the restoring force of 0, 10, the tubes 1, 1 are pressed against the butting members 3, 3 so that the tubes 1, 1 do not come off the joint 2. The caulking members 10, 10 may be fitted in the recesses 6N, 6N of each half member 6 in advance.
In this case, the concave portions 6N of the half member 6 are
If the caulking members 10 and 10 are completely fixed to 6N, the caulking members 10 and 10 do not unexpectedly move with respect to the recesses 6N and 6N of the half member 6, which is advantageous in handling. The caulking member 10 is also inserted into the groove 6M so that both flanges 3A,
3A may be tightened by the restoring force of the caulking member 10. One end of each of the two half members 6 and 6 may be pivotally connected to each other, or may be made of an openable and closable elastic material or the like.
It may be composed of a single character-shaped member, and the specific configuration of the exterior member 4 may be any. In addition, the number of members can be reduced by using the two half members 6 and 6, but the number of members may be three or more. Further, the fastening tool 5 may be constituted by other than the general-purpose bolts 8 and nuts 9.

The caulking member 10 is made of a soft synthetic resin or rubber having an elastic force. As shown in FIG.
Although it has a plate shape and a semicircular shape, it may have a cylindrical shape. This cylindrical caulking member requires time and effort for external fitting to the tube 1. The caulking member 10 uses the restoring force to prevent the pipes 1 and 1 from coming off the joint 2 with a small tightening force. However, the half members 6 and 6 are made of, for example, rubber. In this case, the pipes 1, 1 can be pressed against the butting members 3, 3 on the inner surfaces of the half members 6, 6, and the caulking member 10 is not necessarily required, but the caulking member 10 is provided. The case is more advantageous in terms of the tightening operation force.

In FIG. 2, by making the inner surface 3D of the butting member 3 and the inner surface 1a of the tube 1 flush, the fluid guided by the tube 1 is guided with low flow resistance over the entire area of the guide flow path. However, as shown in FIG. 6, the inner surface 3D of the butting member 3 and the inner surface 1a of the tube 1 are provided.
And may not be flush. In FIG. 2, the end of the tube 1 is forcibly expanded in diameter, but a tube in which a large-diameter portion larger than the diameter of the middle portion of the tube 1 is integrally formed at the end may be used.

The caulking member 10 may be embodied in the shape shown in FIGS. That is, by forming a saw blade on the inner surface of the caulking member 10 so that the direction of the blade engages in the direction in which the pipe 1 is pulled out from the joint 2,
Even if the outer surface of the tube 1 is flat, there is an advantage that the tube 1 can be prevented from easily coming off the joint 2. The other configuration is the same as the above-described configuration, and thus the same reference numerals are given and the description is omitted.

The butting member 3 is connected to the
It may be configured as shown in (a) and (b). That is,
By forming a saw blade on the outer surface 3b of the proximal end portion 3B of the butting member 3 in the direction in which the tube 1 is pulled out from the joint 2, the saw blade engages with the inner surface 1a of the tube 1 so that the inner surface 1a is a flat tube 1. However, there is an advantage that the pipe 1 can be prevented from easily coming off the joint 2. The other configuration is the same as the above-described configuration, and thus the same reference numerals are given and the description is omitted.

FIG. 10 shows a case where the crimping member 10 shown in FIGS. 7 and 8 and the butting member 3 shown in FIGS. 9A and 9B are used. By virtue of the crimping member 10 and the butting member 3 that act to lock the pipe 1, it is possible to further prevent the pipe 1 from easily coming off the joint 2. The other configuration is the same as the above-described configuration, and thus the same reference numerals are given and the description is omitted.

FIGS. 11A and 11B show a crimping member 10 having a rectangular uneven portion 10A formed on the inner surface instead of the saw-shaped crimping member 10 shown in FIG. In the case of the caulking member 10 of FIG. 10, unless the direction of the tube axis direction of the caulking member 10 with respect to the half member 6 is set to a predetermined direction (the direction shown in the drawing), Although the saw blade of the caulking member 10 does not act on the tube 1, FIG.
The crimping member 10 of (a) and (b) functions to lock the pipe 1 regardless of the orientation of the crimping member 6 in any direction. In addition to this, there is an advantage that the assembling operation can be performed quickly without checking the orientation. The other configuration is the same as the above-described configuration, and thus the same reference numerals are given and the description is omitted.

As shown in FIG. 12A, a coil spring S is wound around the outer surface of the tube main body 1A located between the concave portion at the end of the tube 1, ie, the convex portion 1B. As shown, the end of the tube 1 around which the coil spring S is wound is externally fitted to the external fitting portion 3B of the butting member 3 having an outer diameter larger than the inner diameter of the coil spring S, thereby increasing the diameter. Coil spring S
The tube 1 can be prevented from coming off the butting member 3 by utilizing the elastic restoring force of the tube 1 to return to the original state. The other configuration is the same as the above-described configuration, and thus the same reference numerals are given and the description is omitted.

[0025]

According to the first aspect of the present invention, after the outer member is hung on the flange portion of the butting member, the tightening operation of the fastener is easily performed from above to connect the one end portions of the adjacent pipes. Can be completed, and a joint that can easily perform a connection operation while reliably performing a sealing process can be provided. In addition, by separating the exterior member and the flange portion, it is possible to reduce the size and weight of the flange portion as compared with the conventional case in which the flange portion alone secures the shape-retaining strength, and butts the flange portions against each other. The work can be performed easily and quickly, and the time for the connecting work can be further reduced, and the burden on the operator can be reduced.

According to the second aspect, the inner surface of the pipe is formed flat, and the threaded portion forms an annular groove formed from the end face of the base end toward the tip end in the pipe axis direction. In this case, one end of the tube is sandwiched between the butting members from inside and outside in the tube radial direction, and the shape retention strength of one end of the tube can be increased, which is advantageous in terms of durability. Further, by forming the inner surface of the pipe to be flat, the fluid flowing inside can be made to flow with less resistance, and the flow pressure can be reduced to reduce the running cost.

According to the third aspect, the exterior member comprises a pair of upper and lower halves having a semicircular cross-sectional shape in which a groove portion into which both flange portions can be inserted is formed in a state where the flange portions of the butt member abut against each other. A flange for connecting the two half members at both ends of each half member, and a bolt penetrating through a vertical through hole formed in each of the flange portions at both ends of the pair of upper and lower half members, By forming a fastening tool from a nut screwed to the tip of these penetrated bolts, it is possible to use only the necessary minimum number of half members, but tighten both ends with general-purpose bolts and nuts Only by this, the pair of upper and lower half members can uniformly tighten the flange portion, so that both the manufacturing cost and the operation can be improved.

According to the fourth aspect, the proximal end surface of the flange portion is formed to be a tapered surface located closer to the proximal end side toward the inner side in the pipe radial direction, and the tapered surface of the flange portion is formed in a state where these flange portions are abutted. By forming a tapered surface for pressing operation toward the mutually approaching side in the groove formed in the pair of half members, not only can the tightening force be converted to the tightening force of the flange portion, but also Only by changing the inclination angle, the tightening force of the flange portion can be adjusted.

According to the fifth aspect, the half member is tightened with a small operation force enough to elastically deform the caulking member, thereby preventing the pipe from coming off the butting member by using the restoring force of the caulking member. And the tightening operation can be performed lightly and quickly. In addition, by inserting a part of the caulking member into the concave portion, the caulking member does not unexpectedly move with respect to the half member, and the caulking member reliably acts on the outer surface of the base end portion of the butting member. It is possible to prevent the occurrence of troubles such as insufficient fastening.

According to the sixth aspect, it is possible to use the elastic restoring force of the coil spring whose diameter has been increased by the pressing force for pressing the end of the tube against the outer surface of the base end of the butting member.
Not only can the tube be more reliably prevented from coming off the butting member, but also the shape retention strength at the end of the tube can be increased.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state immediately before two pipes are connected by a joint.

FIG. 2 is a partially sectional plan view showing a state where two pipes are connected by a joint.

3A and 3B show a half-split member, wherein FIG. 3A is a plan view in partial cross section, and FIG. 3B is a front view.

FIG. 4 is a front view of a caulking member.

FIG. 5 is a side view of the butting member in a partial cross section.

FIG. 6 is a partially sectional plan view showing a case where the inner surface of the tube and the inner surface of the butting member are not flush.

FIG. 7 is a partially sectional plan view showing a state where two pipes of different shapes are connected by a joint.

FIG. 8 is a plan view of a caulking member having another shape.

FIG. 9 (a) is a sectional view of a second example using a butting member having another shape.
Sectional view showing a state where two pipes are connected by a joint, (b)
FIG. 6 is a side view showing a partially sectioned butting member having another shape.

FIG. 10 is a cross-sectional view showing a state where two pipes are connected by a joint using a crimping member of another shape and a butt member of another shape.

FIG. 11A is a cross-sectional view showing a state where two pipes are connected by a joint using a caulking member having another shape and a butt member having another shape. (B) is a plan view of the caulking member shown in (A).

12A is a side view showing a state immediately before the coil spring is wound around the end of the tube, and FIG. 12B is a cross-sectional view showing a state where the two tubes around which the coil spring is wound are connected by a joint.

FIG. 13A is a longitudinal side view showing a conventional example in which two pipes are connected by a joint, and FIG.
-I sectional drawing.

[Explanation of symbols]

1 Pipe 1A Pipe main body 1B Projection 1a Inner surface 2 Joint 3 Butt member 3A Flange (tip) 3B Base 3C Intermediate 3D Inner 3M, 3N Groove 3T Base end (
3a Tip surface 3b Threaded portion 3X Convex surface 3Y Concave surface 4 Exterior member 5 Clamping tool 6 Half member 6A Flange 6M Groove 6T Tapered surface 6a Through hole 7 O-ring 8 Bolt 9 Nut 10 Caulking member 10A 20 Pipe 20A Female thread 20a Through hole 21 Cylindrical body 21A Flange 22 Bolt 23 Nut 24 Packing S Coil spring

Claims (6)

[Claims] 1. A joint for connecting pipes adjacent in the pipe axis direction with their one ends abutting against each other, comprising a tip having a flange that can be abutted at one end, and A butt member having a base end at the other end having an outer fitting portion capable of externally fitting the end of the tube to a predetermined position; A flange member and an outer member for covering the ends of the two butted tubes from the diametric direction of the tube, and operating the outer member in the radially-reducing direction to operate the flange portions toward each other. And a fastener for pressing and fixing the end of the pipe to the outer surface of the base end of the butting member, wherein the fastener is configured to be capable of being tightened from above. . 2. The inner surface of the tube is formed flat, and the inner surface of the tube whose end is fitted to the butting member and the inner surface of the butting member are flush with each other in the axial direction of the tube axis. The joint according to 1. 3. The exterior member comprises a pair of upper and lower half-members having a semicircular cross-sectional shape in which a groove portion into which both flange portions can be inserted is formed in a state where the flange portions of the butting member abut against each other. A flange is provided at both ends of each half member for connecting the two half members, and a bolt penetrates a vertical through hole formed in each of the flange portions at both ends of the pair of upper and lower half members. The joint according to claim 1, wherein the fastener comprises a nut screwed into a tip of the penetrated bolt. 4. A base end surface of the flange portion is formed in a tapered surface located closer to the base end side inward in a pipe radial direction, and the tapered surfaces of the flange portions are brought closer to each other in a state where the flange portions are abutted with each other. The joint according to claim 1, wherein a tapered surface for performing a pressing operation on a side to be formed is formed in the groove formed in the pair of upper and lower half members. 5. A caulking member for elastically pressing the ends of the tube against the outer surface of the base end of the butting member on both sides of the inner surfaces of the pair of upper and lower half members in the axial direction of the tube. The joint according to claim 3, wherein a concave portion into which a part of the joint is inserted is formed. 6. The tube is formed into a corrugated shape having a spiral uneven portion on an outer surface, and a coil spring is wound around a concave portion at an end of the corrugated tube, and the end of the tube around which the coil spring is wound. 2. The joint according to claim 1, wherein the outer periphery of the butting member having an outer diameter larger than the inner diameter of the coil spring is externally fitted.