JPH06101787A - Pipe connecting fitting - Google Patents

Abstract

PURPOSE:To connect pipes in a wide range in airtight and liquidtight form without requiring a welding work by forming a prescribed taper part on the pipe and providing a prescribed packing, freely movable flange, and a tightening fitting. CONSTITUTION:A taper part 2 having a prescribed angle for a shaft 3 is formed at one edge of a pipe 1. A packing 4 is arranged coaxially between the pipe 1, and a communication port 5 and the first taper surface 8 which is parallel to the taper part 2 are formed on the packing 4, and a projection 9 which is continuous in the peripheral direction and has a height of 1-2mm at the nearly center position in the axial direction and an angle of 30-40 deg. from the axis of the taper part 2 of the pipe is formed on the taper surface 8. A pair of freely movable flanges 10 consisting of a cylinder part 11 for the communication of the retcilinear part of the pipe 1 to the inside and a flange part 12 having the second taper surface 13 at the inner peripheral part are provided. A pair of freely molvable flanges 10 are tightened from the left and right by a bolt 15 and a nut 16, and the taper part 2 is compressed by the part of the projection 9, and the connection in airtight and liquidtight form is achieved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe connector for connecting one end of a pair of pipes such as steel pipes, and more particularly to a pipe connector having extremely easy workability on site.

[0002]

2. Description of the Related Art Piping is mainly used for transportation of fluids in various fields such as water and sewage, city gas, various equipments and facilities for industrial and household use. Therefore, as for the piping work, many methods and structures have been conventionally adopted depending on the application.

A particular problem as a concrete work content of this plumbing work is a pipe joint system, that is, a pipe-pipe connecting system. The following is a list of conventional systems and their characteristics will be explained. To do.

First, there is a connection method by electric welding.
This is because the ends of the steel pipes to be connected directly abut each other,
Although it is integrally joined from the outer periphery by electric welding, it has the advantage that the connecting part can be miniaturized, but in the case of outdoor construction such as rainy weather etc. construction cannot be done to prevent electric shock accidents, welding sparks There are drawbacks such as the possibility of fire in the vicinity, and difficulty in taking measures against corrosion in the pipe after welding. Further, in the case of gas welding, it is necessary to carry out the work while melting it with a gas flame, and therefore it takes a lot of time for a hard pipe such as a steel pipe, and it is usually limited to the non-ferrous metal piping work.

Another method is to use a so-called screw-in type pipe joint. This is a method in which a pipe itself to be connected is threaded and screwed, and has a disadvantage that the strength of the pipe is lowered in order to secure a thread cutting margin while it is compact.

Further, there is a so-called mechanical type pipe joint. There are a bite type in which a pipe is compression-bonded as a packing, and a packing type using a rubber packing or the like. Since the former method causes the pipe itself to function as a packing, it is not applicable to a hard pipe such as a steel pipe, and thus has a large limitation in use.
Further, since the latter method uses rubber packing or the like, there are cases in which the required conditions in terms of pressure resistance, corrosion resistance, durability, etc. cannot be satisfied.

As another method, there is a method of using a pipe flange and connecting them through a packing, but as a premise, welding work between the pipe and the flange is required, and the work becomes complicated accordingly, and the above-mentioned drawbacks are also caused. Exists.

[0008] As described above, the conventional pipe connection system requires welding such as fire prevention and requires a high degree of heat work. However, there are problems such as various restrictions on the aspect.

The present invention has been made to solve the above problems, and an object thereof is to obtain a pipe connector having high performance in a wide range without welding work.

[0010]

According to a first aspect of the present invention, there is provided a pipe connecting member, wherein the end portion of the pipe is expanded into a funnel shape and the end portion has a predetermined angle with the shaft. A tapered portion extending in the circumferential direction of the pipe, and a communication port arranged coaxially between the end portions of the pipes for communicating between the pipes and the tapered portion of the pipe at both axial ends thereof. A packing having a first taper surface which is substantially parallel to the inner surface and has a projection of a predetermined height continuous in the circumferential direction of the pipe in the surface, and a tubular portion into which the straight portion of the pipe can be inserted. A pair of free-moving flanges, which are integrally formed with the cylindrical portion and have a flange portion having an inner peripheral portion with a second tapered surface substantially parallel to the outer surface of the tapered portion of the pipe, and the pair of free-moving flanges. Second taper surface and the packing A fastener is provided which engages between the two floating flanges in a state in which the flange portion is arranged so as to sandwich the tapered portion of the pipe with the first tapered surface. The pipes are air-tightly and liquid-tightly connected by compressing the floating flanges through the packing and permanently deforming the protrusions by a predetermined amount.

According to a second aspect of the present invention, in the pipe connector, carbon steel is used for the packing, the protrusion of the first taper surface is formed at a height of 1 to 2 mm at a substantially central position in the width direction, and The angle from the axis of the taper part is 30-40
It is a degree. In this case, an appropriate pressure is evenly applied to the protrusions to exert a reliable sealing function.

According to a third aspect of the present invention, there is provided a pipe connecting tool, wherein the tightening tool is composed of a bolt fitted through a hole formed in the vicinity of the outer periphery of the flange of the floating flange and a nut screwed with the bolt. Is.

According to a fourth aspect of the present invention, there is provided a pipe connector in which a flange portion is integrally formed on an outer periphery of an axial center of the packing, and a bolt is passed through a hole formed near the outer periphery of the packing flange portion. Thus, the occurrence of inclination between the packing shaft and the pipe shaft during tightening work is suppressed.

According to a fifth aspect of the present invention, there is provided a pipe connector, wherein a first engaging portion formed along an outer circumference of the packing and a second engaging portion formed on a surface of the floating flange facing the packing along a circumferential direction.
By engaging both of the locking portions with each other, the packing and one of the pair of floating flanges can be moved in the axial direction during compression tightening between the two floating flanges. It can be held coaxially without being restrained. In this case, since the relative positional relationship between the packing and the floating flange is maintained in an accurate state, the assembling work is simple and the finish thereof is reliable.

According to a sixth aspect of the present invention, there is provided a pipe connector in which a flange portion is integrally formed on an outer periphery of an axial center of the packing, and a shaft portion is provided at both flange portions of one of the pair of floating flanges and the packing flange. Direction hole, the hole formed in one of the flanges is a screw hole to be screwed with the temporary tightening bolt, and the hole formed in the other flange is simply a through hole, and a pair is used to connect a pair of pipes. Prior to compression-tightening between the floating flanges, the provisional tightening bolts are inserted through the insertion holes formed in the one free flange or the packing through which the pipe is inserted and screwed into the screw holes. Due to the first packing
The tapered surface of the pipe and the second tapered surface of the one free flange are used to tighten the tapered portion of the pipe at a pressure lower than that at the time of final connection tightening so that both flange portions can be held in a substantially parallel posture. In this case, first, since the packing and the one floating flange are held in a substantially regular positional relationship, the other remaining floating flange and the pipe are aligned with each other, and the subsequent tightening work with the tightening tool is simple, accurate, and reliable. A connected state can be obtained.

A pipe connector according to a seventh aspect of the present invention is provided with a guide mechanism for holding the packing and one of the floating flanges coaxially without restraining the axial movement of the temporary tightening bolt when it is operated. Is. In this case, the packing and the floating flange can be positioned relative to each other by relying on the guide mechanism, which makes the work extremely easy.

According to an eighth aspect of the present invention, there is provided a pipe connector, wherein the floating flange is divided into a plurality of sections along the circumferential direction thereof, and a plurality of flange pieces are connected to each other. And a coupling mechanism for coupling to an annular one body. In this case, for example, even when the tapered portions are already formed on both ends of the pipe, the floating flange can be attached to the pipe, and the work efficiency is improved.

[0018]

1 is a sectional view showing a pipe connector according to an embodiment of the present invention. In the figure, 1 is a pair of pipes to be connected to each other, and as a specific example, it can be applied to various materials and shapes according to the application, such as carbon steel pipes for piping (JISG3452). Reference numeral 2 denotes a taper portion formed at one end of the pipe 1, which is formed by expanding the end portion of the pipe 1 into a funnel shape, and the surface of the taper portion 2 is 30 to 40 degrees with respect to the axis 3 of the pipe 1. It has an inclination. This processing is usually done in the factory before sending the equipment to the construction site.

Numeral 4 is a packing arranged coaxially with the pipe 1 so as to be inserted between the tapered portions 2 of both pipes 1, and is made of carbon steel such as stainless steel. Mold as shown in. That is, first, the shaft 3
A communication port 5 is formed coaxially with and a flange portion 6 is formed on the outer periphery of the center in the axial direction. In the vicinity of the outer periphery of the flange portion 6, a plurality of holes 7 for inserting bolts of a fastener described later are provided. On the other hand, a first taper surface 8 is formed on both ends of the packing 4 in the axial direction, and the first taper surface 8 of the pipe 1 is arranged when the pipe 1 and the packing 4 are coaxially arranged as shown in FIG. It is formed so as to be parallel to the tapered portion 2. Further, a projection 9 having a height of 1 to 2 mm is provided at the center of the first tapered surface 8 in the width direction so as to be continuous in the circumferential direction.

Returning to FIG. 1, reference numeral 10 denotes a floating flange, which is composed of a tubular portion 11 into which a straight portion of the pipe 1 can be inserted, and a flange portion 12 formed integrally with the tubular portion 11. A second tapered surface 13 finished in a surface parallel to the tapered portion 2 of the pipe 1 is provided on the inner peripheral portion. A hole 14 similar to the hole 7 of the packing 4 is also provided near the outer periphery of the flange portion 12 of the floating flange 10.

Numerals 15 and 16 are bolts and nuts as tightening tools, and the bolts 15 are attached to the pair of left and right floating flanges 1.
0 and the packing 4 inserted between them are inserted into the holes and screwed with the nut 16 to tighten them.

Next, the procedure for assembling this pipe connecting tool, which is usually a work at a construction site, will be described with reference to FIG. First, a pair of pipes 1 to be connected (note that a tapered portion 2 is formed in advance at one end of these pipes 1) are arranged coaxially with the tapered portions 2 facing each other. Therefore,
It is better to prepare an appropriate jig for arranging the pipe 1 coaxially. Next, as shown in FIG. 3, the packing 4 is coaxially arranged between the pipes 1. In addition, the pair of floating flanges 10 are inserted from the straight portion of the pipe 1 so that the flange portions 12 face forward, and the state shown in FIG. 3 is obtained. Insert the bolt 15 by aligning the positions of the holes with the holes 4.

When the floating flange 10 is inserted as described above, the opening diameter of the tubular portion 11 of the floating flange 10 and the pipe 1
There is a relatively large dimensional difference from the outer diameter of the, and after inserting to the vicinity of the tip, a wedge-shaped liner is dispersed and fitted in the circumferential direction between the two to hold them coaxially. If adopted, insertion work can be performed easily and positioning of each component can be performed accurately and reliably.

When the pipe 1, packing 4 and floating flange 10 can be set to the positions shown in FIG. 1, the bolt 1
The nut 16 is screwed on the screw 5, and is tightened evenly to a predetermined torque using a torque wrench or the like.

When both floating flanges 10 are compressed and tightened in this manner, the compressive force of the floating flanges 10 and the first tapered surface 8 of the packing 4 facing each other in parallel with each other via the tapered portion 2 of the pipe 1. Concentrate on the second tapered surface 13. Here, the inclination angle of the tapered portion 2 from the axis 3 is 30 to
Since it is set at 40 degrees, the tightening force can be effectively converted into the compressive force of the taper portion 2 without overworking the pipe 1. That is, when the inclination angle exceeds 40 degrees, the wall thickness of the bent portion of the pipe 1 is greatly reduced during the pipe expanding process, resulting in insufficient workability such as insufficient strength and breakage. On the other hand, if the angle is less than 30 degrees, the tightening force is not effectively converted into the compressive force of the taper portion 2 and slippage in the axial direction easily occurs.

When an appropriate compressive force is applied between the tapered surfaces 8 and 13, the force is effectively concentrated on the projection 9 formed on the first tapered surface 8, and the projection 9 is slightly deformed permanently. As a result, the inner surface of the taper portion 2 and the first taper surface 8 of the packing 4 are joined to each other in an airtight and liquid-tight manner, and eventually the pair of left and right pipes 1 are integrally connected via the packing 4 and the inside of both pipes Becomes a communication state through the communication port 5 of the packing 4.

When the height of the projection 9 from the first tapered surface 8 exceeds 2 mm, the tightening force excessively concentrates on the projection 9 and exceeds the level of permanent deformation effective for sealing. Part of it is likely to be damaged, and the tapered portion 2 of the pipe 1 is also damaged. On the other hand, if the height of the protrusion 9 is less than 1 mm, some parts of the protrusion 9 may not reach the tightening force due to the dimensional variation of each part that may occur, and reliable airtight and liquid-tight performance can be obtained. It will not be possible.

FIG. 4 is a sectional view showing a pipe connector according to another embodiment of the present invention. The same or corresponding parts as those of the previous embodiment are designated by the same reference numerals and the description thereof will be omitted. The feature of this embodiment is that, as shown in FIG. 5 as a single body, the first locking portion 17 is provided at the outer peripheral tip of the flange portion 6 of the packing 4, and the packing 4 of the flange portion 12 of the floating flange 10. And a point where the second locking portion 18 is provided on the surface opposite to. Here, a plurality of first locking portions 17 are provided on the outer periphery of the flange portion 6 by processing a leaf spring having a predetermined width at equal intervals, and the packing 4 is moved upward in the arrangement of FIG. By mounting the first locking portion 17 and the second locking portion 18 so as to engage with each other, the floating flange 10 and the packing 4
And will be held on the same axis. Of course, during actual work, the tapered portion 2 of the pipe 1 is inserted between the two in actual operation. In this way, since the packing 4 is coaxially held by the one floating flange 10, the assembling work including the other floating flange 10 can be simplified correspondingly, and the dimensions, the positioning and the like can be easily and surely made. .

The first locking portion 17 and the second locking portion 1
By engaging with each other, the packing 4 and the floating flange 10 are coaxially held so as not to be displaced in the radial direction, but are not mutually restrained within a certain range with respect to axial movement. Has become. Therefore, the tightening / compressing operation by the bolt 15 and the nut 16 can be performed without hindrance in this held state.

Further, in the embodiment shown in FIGS.
Is formed at the widthwise end of the tapered surface 8. There is an advantage that the machining of this part of the packing 4 becomes simpler as compared with the case of the embodiment shown in FIG. 1 provided in the center in the width direction.

FIG. 6 shows a pipe connector according to still another embodiment of the present invention, in which the floating flange 10 and the packing 4, which are the main parts thereof, are shown in particular. That is, FIGS. 6A and 6B are a side sectional view and a front view of the floating flange 10, and FIGS. 6C and 6D are the packing 4 thereof.
FIG. 3 is a side sectional view and a front view of FIG. In the figure,
Reference numerals 9 and 11 to 14 are equivalent to those in the previous embodiment, and duplicated description will be avoided. However, in the embodiment of FIG. 1, a round hole 7 is provided in the flange portion 6 of the packing 4 in order to insert the bolt 15 for tightening between the floating flanges 10. However, here, a semicircular recess 7a is formed. There is.

Reference numeral 19 of the floating flange 10 is an insertion hole formed by penetrating the flange portion 12 in the axial direction, and as shown in FIG.
There are 4 places in the middle. Packing 4 of 20
Is a screw hole formed in the flange portion 6 in the axial direction at a position corresponding to the same radial direction circumferential position as the insertion hole 19 of the floating flange 10, into which a temporary tightening bolt (not shown) can be screwed.

Returning to the floating flange 10, reference numeral 21 is a guide as a guide mechanism provided on the surface of the flange portion 12 facing the packing 4 at a predetermined height, and as shown in FIG. The arc-shaped plan view is provided at four places at equal intervals in the circumferential direction. The side surface of the guide 21 on the inner diameter side is configured to substantially circumscribe the outer peripheral surface of the flange portion 6 of the packing 4. Further, the height of the guide 21 in the axial direction is such that the bolts 15 and the nuts 1 are provided between the floating flanges 10 for surely connecting the pipes 1.
Even in the state where it is sufficiently tightened by 6, the tip end is kept at a value that does not contact the flange portion 6 of the packing 4.

Next, the procedure for assembling the pipe connector using the floating flange 10 and the packing 4 shown in FIG. 6 will be described. Finally, as described with reference to FIG. 3, the packing 4 is placed in the middle, and the tape portions 2 of both pipes 1 are arranged.
It is necessary to clamp between the floating flanges 10 on both sides so that they are sandwiched, but as described above, these assembling are generally unfavorable site work, and depending on the pipe diameter, packing 4 and both Since the weight of the floating flange 10 may become considerably large, it is not always easy to proceed with the work by aligning the three members on the same axis. If the shaft is misaligned or the parallelism is misaligned, the airtight and liquidtight connection is ensured. I can't get the state. Floating flange 10 and packing 4 of FIG.
This greatly improves this point and makes the work extremely simple and reliable.

That is, the floating flange 10 of FIG. 6 is used as one floating flange 10 (for convenience, referred to as the left floating flange 10 of FIG. 3) through which the pipe 1 is inserted, and the packing 4 of FIG. 6 is also used for this. The outer periphery of the flange portion 6 is fitted into the guide 21 of the floating flange 10 so as to approach the floating flange 10. On the other hand, four temporary fastening bolts (not shown) are inserted through the insertion holes 19 of the floating flange 10 from the left side of FIG. 6 and screwed into the screw holes 20 of the packing 4.
Then, when the temporary tightening bolts are sequentially rotated and evenly tightened, during this time, the guide 21 of the floating flange 10 and the packing 4 abuts on the outer periphery of the packing 4, and the radial relative positional relationship between them is restricted. As a result, they approach each other in a coaxially parallel posture, and eventually the first tapered surface 8 of the packing 4 and the second tapered surface 13 of the floating flange 10 sandwich the tapered portion 2 of the pipe 1 and abut on each other. It becomes a state. First
The tightening is limited to the range in which the projection 9 provided on the tapered surface 8 does not cause permanent deformation.

By the above temporary tightening, the left floating flange 10 in FIG. 3 and the packing 4 are held coaxially in parallel and can be handled as a unit, so that the left and right floating flanges 10 in FIG. Bolt 15 and nut 16
The tightening work becomes extremely easy with the two floating flanges 10 and the packing 4 kept in parallel with each other, so that both tapered surfaces 8 and 13 are also parallel to each other and the tapered portion 2 of the pipe 1 is securely tightened and a sufficient seal is obtained. Be effective.

In the final tightening process, the role of the temporary tightening bolt ends and the tension caused by screwing is released. As a result, the head of the floating flange 10 is lifted up from the flange portion 12, so that the head portion can be turned in the opposite direction and easily recovered.

In the embodiment shown in FIG. 6, the hole formed in the floating flange 10 is the insertion hole 19 and the hole formed in the packing 4 is the screw hole 20, but conversely, the floating flange 10 is provided with the screw hole and the packing. You may make it form an insertion hole in 4. At this time, the temporary tightening bolt is inserted from the packing 4 side. Moreover, the screw hole 20 does not necessarily need to be provided so as to penetrate the flange portion. Further, in the embodiment shown in FIG. 6, the guide mechanism has a structure in which the inner diameter side surface of the guide 21 formed on the floating flange 10 is brought into sliding contact with the outer peripheral side surface of the flange portion 6 of the packing 4, but the invention is not limited to this. Instead of this, for example, the guide may have a cylindrical pin shape, and the guide may be slid through the insertion hole formed in the flange portion 6 of the packing 4.

FIG. 7 is a structural view showing a floating flange 10 used in a pipe connector according to still another embodiment of the present invention. The greatest feature of this embodiment is that the floating flange is composed of two split flange pieces, and the pair of semicircular flange pieces are integrally connected at the site where the piping work is performed. Hereinafter, the details will be described with reference to FIG. 7. FIG. 7 shows one of the divided flange pieces 22. FIG. 7A is a front view thereof, FIG. 7B is a right side view thereof, and FIG.
Is a rear view thereof, and (d) and (e) are a coupling ring and a coupling pin, respectively, as a coupling mechanism required when coupling the pair of flange pieces 22.

In the figure, a cylinder portion 11, a flange portion 12,
The second taper surface 13, the hole 14, the insertion hole 19, and the guide 21 are the same as those in the embodiment of FIG. Reference numeral 25 denotes a first coupling groove as a coupling mechanism, which is formed in a semicircular arc shape at a predetermined depth in the axial direction on the surface of the flange portion 22 of the flange piece 22 facing the packing 4, and as shown in the drawing, It is provided in two places, upper and lower. Reference numeral 26 is a second coupling groove as a coupling mechanism, which is also formed in a semicircular arc shape at a predetermined depth in the axial direction on the end surface of the tubular portion 11 of the flange piece 22, and is provided at two upper and lower positions. Reference numeral 27 denotes a third coupling groove formed in a semicylindrical shape in the radial direction, as shown in FIG.

Next, the flange piece 22 shown in FIG. 7, another flange piece 22 having exactly the same shape, and the coupling ring 23 and the coupling pin 24 shown in FIGS. 7 (d) and 7 (e).
A procedure for connecting both flange pieces 22 by using to complete the floating flange 10 having an integral structure will be described. First, 2
The individual flange pieces 22 are held so that their front surfaces in FIG. At the site, this work is performed by inserting the straight portion of the pipe 1 into the tubular portion 11. In this state, the grooves of the first and second coupling grooves 25 and 26 are formed into a complete annular shape by the abutting of the flange pieces 22, so that the coupling shown in FIG. Fit the ring 23. At the same time, the third coupling groove 27
Since the groove shape of is also a perfect cylinder by the abutting of both flange pieces 22, the coupling pin 24 shown in FIG. 7E is fitted into this groove 27.

Since the grooves 25, 26, 27, the coupling ring 23, and the coupling pin 24 are machined to have proper fitting dimensional tolerances, they are surely fitted to each other, so that the above-described embodiment has been described. An integral floating flange 10 similar to the above is assembled. That is, by fitting the coupling ring 23 into the first and second coupling grooves 25 and 26, the radial and circumferential positions of the pair of flange pieces 22 are reliably restrained. Further, by fitting the coupling pin 24 into the third coupling groove 27, the axial positions of the pair of flange pieces 22 are securely restrained.

After connecting the pair of flange pieces 22 to form the floating flange 10, the original pipe connecting work is started.
Since the contents are the same as those in the above-mentioned embodiment, the description will not be repeated.

The following effects can be obtained by adopting the split coupling type floating flange 10. That is, in the above-described embodiment, the pipe expanding work for forming the taper portion 2 at the end of the pipe 1 is usually performed in a factory as described above, but when this processing is performed at both ends of the pipe 1, the pipe expanding work is performed. Prior to the above, it is necessary to insert the pipe 1 into the floating flange 10. Therefore, the pipe 1 and the floating flange 10 must be conveyed in a combined form from the factory to the site.
The handling is complicated and the packing specifications are complicated and large, which is uneconomical. However, the split coupling type floating flange 10 shown in FIG.
By adopting the above, these inconveniences are eliminated, and the pipe 1 and the floating flange 10 can be handled separately, so that handling such as transportation becomes simple and inexpensive.

On the other hand, if the floating flange 10 is of the split joint type, it is intuitively feared that the air-tight and liquid-tight function at the time of pipe connection may be hindered. But this concern is not necessary at all. That is, as described with reference to FIG. 1, the airtight and liquid-tight function of the pipe connector according to the present invention is achieved by the packing
First taper surface 8 of the projections, in particular projections 9 formed on the surface thereof.
Is pressed against the tapered portion 2 of the pipe 1. The role of the floating flange 10 is to secure the pressure. Therefore, the joining surface of the pair of flange pieces 22 joined together is not required to have the airtight and liquidtight performance by itself, and the pipe 1 is prevented by the second tapered surface 13.
From the back surface of the taper portion 2 to the first taper surface 8 of the packing 4.
It is sufficient if the gap between the joint surfaces is small to the extent that the pressure applied to the surface is not interrupted in the circumferential direction.
This is reliably achieved by the coupling mechanisms 23 to 27 shown in FIG.

Note that the coupling mechanism in the split coupling type shown in FIG. 7 is only an example, and various modifications can be applied in consideration of manufacturing conditions of each part, cost, and final required specifications. Needless to say.

Further, although stainless steel was used as the material of the packing 4 in each of the above-mentioned embodiments, other types of carbon steel materials may be used, and brass or the like may be used if the conditions such as the fluid handled in the pipe allow. Materials may be used. Also,
Even if the pipe is not limited to the circular steel pipe and has various shape materials, the present invention can be similarly applied and has the same effect.

[0048]

As described above, according to the present invention, since a predetermined taper portion is formed on the pipe and a predetermined packing, a floating flange and a fastener are provided, the pipe can be used in a wide range without welding work. Can be air-tightly and liquid-tightly connected.

Also, the material of the packing, the height of its protrusion,
Further, by limiting the inclination of the taper portion to a predetermined material and range, the sealing function can be obtained more reliably and stably.

Further, the bolt of the fastener is inserted into the hole formed in the flange portion of the packing,
The packing is prevented from falling during tightening work, and the work becomes easier.

Further, by providing a predetermined engaging portion on the packing and the floating flange so that they can be engaged with each other, the packing is held coaxially with one floating flange during tightening work. Minute work becomes easy.

Further, by forming a predetermined insertion hole and a screw hole and preliminarily holding one of the floating flange and the packing integrally with the temporary tightening bolt, originally, the three tightening and assembling work of both the floating flange and the packing can be performed. In reality, the work is performed by two persons, workability becomes extremely easy, and a reliable connected state exhibiting a high air-tight and liquid-tight function can be stably obtained.

Furthermore, by providing a predetermined guide mechanism, the above-mentioned temporary tightening work becomes easier and more reliable.

Further, by adopting a system in which predetermined flange pieces are integrally connected by a connecting mechanism to form a floating flange, the work of inserting the pipe into the free flange prior to the connecting work can be easily performed on site. Therefore, handling including transportation from the factory to the site is extremely convenient and cost is reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing a pipe connector according to an embodiment of the present invention.

FIG. 2 is a view showing the packing of FIG. 1 alone.

FIG. 3 is a view showing a state where the pipe connector of FIG. 1 is being assembled.

FIG. 4 is a sectional view showing a pipe connector according to another embodiment of the present invention.

FIG. 5 is a view showing the packing and the floating flange of FIG. 4 independently.

FIG. 6 is a view showing a pipe connector according to still another embodiment of the present invention, particularly its floating flange and packing.

FIG. 7 is a view showing a pipe connecting member according to still another embodiment of the present invention, particularly a flange piece thereof.

[Explanation of symbols]

1 is a pipe, 2 is a tapered portion, 3 is a shaft, 4 is packing, 5
Is a communication port, 6 is a flange portion, 7 is a hole, 8 is a first tapered surface, 9 is a protrusion, 10 is a floating flange, 11 is a cylindrical portion, and 12 is a cylindrical portion.
Is a flange portion, 13 is a second tapered surface, 14 is a hole, 15
Is a bolt, 16 is a nut, 17 is a first locking portion, 18 is a second locking portion, 19 is an insertion hole, 20 is a screw hole, 21 is a guide, 22 is a flange piece, 23 is a coupling ring, 24 Are coupling pins, and 25 to 27 are first to third coupling grooves.

Claims (8)

[Claims] 1. A method for connecting one ends of a pair of pipes arranged on the same axis to each other, wherein the ends of the pipes are expanded into a funnel shape, and the ends have a predetermined angle with the shaft. A tapered portion extending in the circumferential direction of the pipe is formed, and a communication port which is coaxially arranged between the end portions of the both pipes for communicating between the both pipes and a taper of the pipe at both axial ends thereof. A packing having a first taper surface, which is a surface substantially parallel to the inner surface of the section and has a projection of a predetermined height continuous in the circumferential direction of the pipe, and a tube into which the straight portion of the pipe can be inserted Part and a pair of floating flanges formed integrally with the tubular part and having a second tapered surface on an inner peripheral portion thereof having a second tapered surface substantially parallel to the outer surface of the tapered part of the pipe, and the pair of floating flanges. As its second taper surface The packing includes a fastener that engages between the two floating flanges in a state in which the flange is arranged so as to sandwich the tapered portion of the pipe with the first tapered surface of the packing. A pipe connector characterized in that the two pipes are air-tightly and liquid-tightly connected by compressing and clamping the floating flanges via the packing and permanently deforming the protrusions by a predetermined amount. 2. Carbon steel is used for the packing, and
The projection of the first taper surface is formed at a height of 1 to 2 mm at a substantially central position in the width direction, and the angle from the axis of the taper portion of the pipe is set to 30 to 40 degrees. Pipe connector. 3. The fastener is composed of a bolt mounted through a hole formed in the vicinity of the outer periphery of the flange of the floating flange and a nut screwed with the bolt. The pipe connector described. 4. A packing shaft and pipe at the time of tightening work by forming a flange portion integrally with the outer periphery of the center of the packing in the axial direction and passing a bolt through a hole formed in the vicinity of the outer periphery of the packing flange portion. The pipe connector according to claim 3, wherein an inclination with respect to the axis of the pipe is suppressed. 5. A first member formed along the outer periphery of the packing.
And a pair of floating flanges by engaging the locking portions with each other by engaging the locking portions with a second locking portion formed on a surface of the floating flange facing the packing in the circumferential direction. 4. The pipe according to any one of claims 1 to 3, characterized in that either one of them can be held coaxially without restraining the axial movement during compression tightening between the floating flanges. Connector. 6. A packing is integrally formed with a flange portion on the outer periphery of the center of the packing in the axial direction, and an axial hole is formed in both flange portions of one of the pair of floating flanges and the packing flange. The hole formed in one of the flange parts is a screw hole to be screwed with the temporary tightening bolt, and the hole formed in the other flange part is simply an insertion hole.Compression tightening between a pair of floating flanges to connect a pair of pipes. Prior to this, by inserting the temporary tightening bolt through the insertion hole formed in the one floating flange or the packing through which the pipe is inserted and screwing it into the screw hole, the first of the packing is obtained. Tighten the tapered portion of the pipe with the taper surface and the second tapered surface of the one floating flange at a pressure lower than that at the time of final connection tightening, and keep both flanges in a substantially parallel posture. The pipe connector according to claim 3 or 4, wherein the pipe connector is capable of being held. 7. A guide mechanism for holding the packing and one of the floating flanges coaxially without restraining the axial movement of the temporary tightening bolt when the temporary tightening bolt is operated. Pipe connector. 8. A plurality of flange pieces constituting a plurality of sections each having a floating flange divided into a plurality of sections along the circumferential direction thereof, and a coupling for coupling these flange pieces to each other and to an annular integral body. The pipe connector according to any one of claims 1 to 7, which is configured by a mechanism.