JP2655392B2 - Telescopic flexible pipe joint - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telescopic flexible pipe joint for connecting a connected pipe, which is a pipe for transporting gas, water, oil or the like, so that the pipe can be expanded and contracted.

[0002]

2. Description of the Related Art In a conventional telescopic flexible pipe joint a shown in FIG. 6, two connected pipes b and c are arranged in series with an interval L therebetween, and outside the connected pipes b and c. The socket pipe d loosely fitted to the pipes 2 is disposed across the opposed pipe ends e and f of the two connected pipes b and c, and is loosely fitted outside the connected pipes b and c.
The fastening rings g and h are arranged on both sides of the socket tube d and are connected to each other by a plurality of connecting bolts k. The tapered surfaces i and j on the inner surfaces of both ends of the socket tube d and the connected tubes b and c are connected to each other. The rubber packing rings m and n sandwiched between the outer peripheral surfaces are pressed against the outer peripheral surfaces of the connected tubes b and c by the tightening rings g and h, and the respective connected tubes b and c are respectively pressed. Sealed slidably in the axial direction X.

In this telescopic flexible pipe joint a, a socket pipe d
Since the clamp rings g and h are loosely fitted to the connected tubes b and c, gaps W1 and W2 exist between the socket tubes d and the clamp rings g and h and the connected tubes b and c. ing. For this reason, the connected pipes b and c connected by the telescopic flexible pipe joint a can bend in the directions of the double arrows Z1 and Z2 with the portion where the packing rings m and n are pressed against each other as a fulcrum.

[0004] In the telescopic flexible pipe joint a, a tightening ring g,
h, the packing rings m, n pressed against the outer peripheral surfaces of the connected pipes b, c seal the connected pipes b, c so as to be slidable in the axial direction X of the connected pipes b, c. Is extensible within the range of the interval L between the pipe ends e and f, and is also contractible within a range until the pipe ends e and f reach the vicinity immediately below the packing rings m and n.

[0005] For this reason, in the telescopic flexible pipe joint a, expansion and contraction of the connected pipes b and c due to a temperature change of the environment surrounding the connected pipes b and c are predicted in advance, and from the pipe ends e and f. By setting the distance to the vicinity immediately below the packing rings m and n and the distance L between the pipe ends e and f in a designed manner, the expansion and contraction of the connected pipes b and c within the predicted range can be absorbed. Can be.

However, a force that moves the connected pipes b and c in the axial direction X beyond the predicted range acts on the connected flexible pipes a and c as in the case of an earthquake. In case,
The pipe ends e and f of the connected pipes b and c move beyond the vicinity immediately below the packing rings m and n, and transported objects such as gas, water, oil, and the like transported in the connected pipes b and c. May leak or flow out of the connected pipes b and c.

The conventional pipe joint 1 shown in FIGS.
In the above, a storage portion 10 is formed in each of the tightening rings 4 and 5, and a chip 12 having a biting tooth 11 inside the storage portion 10,
A cap 13 for protecting a biting portion of the biting tooth 11 in the connected pipes 2 and 3 from corrosion is stored therein.
Two chips 12 are arranged at equal intervals in the circumferential direction on the outer peripheral surface of each of the connected tubes 2, 3, and the bite teeth 11 are fixed to the connected tubes 2 by lock bolts 14 screwed to the respective storage portions 10.
3 is pressed into contact with the outer peripheral surface thereof, and the pressing force applied to the connected pipes 2 and 3 by the pressure contact is balanced, so that the biting teeth 1
1 is fixed to the connected pipes 2 and 3 by cutting into the outer peripheral surfaces of the connected pipes 2 and 3.

For this reason, in the pipe joint 1, each connected pipe 2,
3 is prevented from sliding in the axial direction X. Since the structure other than the structure described above is the same as that of the telescopic flexible pipe joint a, the description thereof is omitted.

By the way, in the pipe joint 1, the pressing force on the connected pipes 2 and 3 due to the pressure contact of the tip 12 is balanced, so that the socket pipe 6 and the tightening rings 4 and 5 are connected to the connected pipes 2 and 3.
3, there are gaps W3 and W4. For this reason,
The connected tubes 2 and 3 can bend in the directions of the double arrows Z3 and Z4 with the contact portion between the tip 12 and the lock bolt 14 as a fulcrum.

In the joint 1, since the connected pipes 2 and 3 are prevented from sliding in the axial direction X, the connected pipes 2 and 3 are moved in the axial direction X as in the case of an earthquake. Even when a force acts on the connected pipes 2 and 3,
The tube ends 2a, 3a of 3 do not exceed the vicinity immediately below the packing rings 7, 8. Therefore, there is no danger that the transported object such as gas, water, or oil transported in the connected pipes 2 and 3 leaks out of the connected pipes 2 and 3 in the pipe joint 1.

However, since the connected pipes 2 and 3 are prevented from sliding in the axial direction X, the connected pipes 2 and 3 expand and contract in the axial direction X due to a temperature change or the like. In case of movement or movement due to earthquake, vibration, etc., the expansion and contraction and movement cannot be absorbed, and as a result, the main equipment such as storage tanks, pumps, and various valve mechanisms connected by pipelines will be damaged There is a risk.

[0012]

In view of the danger of the telescopic flexible pipe joint a shown in FIG. 6 and the danger of the pipe joint 1 shown in FIG. When the connected pipe is slidable in the axial direction and the force to slide the connected pipe beyond its set range acts on the connected pipe in the event of an earthquake, etc. Expansion and contraction flexibility that can prevent sliding of the connected pipe by setting the maximum blocking force so that the main equipment is not damaged due to the blocking. It is an object to provide a pipe joint.

[0013]

According to a first aspect of the present invention, there is provided a socket in which two connected tubes are arranged in series at an interval and are loosely fitted to the outside of the connected tube. A pipe is arranged over both opposed pipe ends of the connected pipes, and two tightening rings loosely fitted to the outside of the connected pipe are arranged on both sides of the socket pipe, and a plurality of connecting bolts are used. The packing rings, which are connected to each other and are sandwiched between the inner surfaces of both ends of the socket tube and the outer peripheral surface of the connected tube, are pressed against the outer peripheral surface of the connected tube by the tightening ring, and each connected tube is The following configuration is added to the telescopic flexible pipe joint that is slidably sealed in the axial direction.

That is, according to the first aspect of the present invention, each of the two or more chips mounted on the outer peripheral surface of each connected pipe has a biting tooth extending toward the pipe end of the connected pipe, It is housed inside a housing part formed in the tightening ring, and both connected tubes are movable only in the axial direction separated from each other,
The biting teeth are pressed against the outer peripheral surface of the connected pipe by a lock bolt screwed into the storage portion, and are arranged at positions where the pressing force on the connected pipe due to the pressing is balanced. The bolt contact surface is a tapered surface gradually approaching the outer peripheral surface of the connected pipe from the end near the pipe end to the other end of the connected pipe, and the initial contact of the lock bolt on the tapered surface. A configuration in which a convex portion that abuts on a lock bolt and prevents sliding of the connected pipe is formed at an end near the pipe end remote from the position is added to the telescopic flexible pipe joint. ing.

According to the second aspect of the present invention, the opening formed in the receiving portion formed in the tightening ring allows a chip to be inserted into and taken out of the storing portion while the tightening ring is loosely fitted to the outside of the connected pipe. The configuration in which the portion is formed is added to the first aspect of the present invention.

According to the third aspect of the present invention, the storage portion is formed on the lock ring separate from the tightening ring, and two or more connecting bolts among the plurality of connecting bolts for connecting the two tightening rings to each other. The lock ring is detachably fixed to the tightening ring by
A configuration in which a storage portion is attached to the tightening ring is added to the first or second aspect of the present invention.

According to a fourth aspect of the present invention, a configuration in which the lock ring is divided into two or more in the axial direction is added to the third aspect of the invention.

[0018]

According to the first aspect of the present invention, as shown in FIG. 2, two or more chips 120 mounted on the outer peripheral surface of each of the connected pipes 101, 102 are connected to the fastening rings 104, 102. Since the two connected pipes 101 and 102 are accommodated in the storage part 110 formed in 105 and can be moved only in the axial direction X1 separated from each other, the two connected pipes 101 and 102 are close to each other. When sliding in the direction X2, only the connected tubes 101 and 102 move in the axial direction X2, and the chip pieces 120 do not move together with the connected tubes 101 and 102.

When the connected pipes 101 and 102 slide in the axial direction X2 approaching each other, each connected pipe 1
Each of the two or more chips 120 mounted on the outer peripheral surface of each of the connected pipes 101 and 102 has
Since it extends toward the pipe ends 101 a and 102 a of the connection pipe 102, even if the bite teeth 121 are pressed against the outer peripheral surfaces of the connected pipes 101 and 102 by the lock bolt 111 screwed to the storage portion 110, the bite teeth There is no possibility that 121 is cut into the outer peripheral surfaces of the connected pipes 101 and 102.

On the other hand, when the connected pipes 101 and 102 slide in the axial direction X1 separated from each other, the connecting pipes 101 and 102 have the biting teeth 121 extending toward the pipe ends 101a and 102a of the connected pipes 101 and 102. In each chip 120, a biting tooth 121 is pressed against the outer peripheral surfaces of the connected tubes 101 and 102 by a lock bolt 111, and a lock bolt contact surface 122 is formed on the pipe ends 101 of the connected tubes 101 and 102.
a, 102a, from the end 123 closer to the other end 124, the tapered surface gradually approaches the outer peripheral surface of the connected pipes 101, 102. While gradually digging into 121,
It moves together with the connected pipes 101 and 102 in the axial direction X1.

However, an end 123 of the lock bolt contact surface 122 of each chip 120 near the pipe ends 101a, 102a separated from the initial contact position of the lock bolt 111 is brought into contact with the lock bolt 111 and covered. Since the protruding portion 125 for preventing the sliding of the connecting tubes 101 and 102 is formed, the movement of each chip 120 along with the connected tubes 101 and 102 in the axial direction X1 in which the both connected tubes 101 and 102 are separated from each other. Means that the lock bolt 111 is the tip 1
The chip 120 is blocked by contact with the convex portion 125 of the connector 20, and at this time, each chip 120 is connected to the connected tubes 101 and 102.
The biting teeth 121 are firmly cut into the outer peripheral surfaces of the connecting pipes 101 and 102 and are fixed to the connected pipes 101 and 102, so that even when the connected pipes 101 and 102 slide, the lock bolt 111 abuts on the projection 125 of the tip 120. Blocked by

If a plurality of telescopic flexible pipe joints 100 according to the first aspect of the present invention are used in a pipe at an appropriate interval, both connected pipes 101 and 102 slide in the same axial direction X. Even in the case where the two connected pipes 101 and 102 slide in the axial direction X2 approaching each other, the connected pipes 101 and 102 are interacted by the plurality of telescopic flexible pipe joints 100.
As in the case where the connected tubes 101 and 102 slide in the axial direction X1 that is separated from each other, the sliding of the block 102 is prevented by the lock bolt 111 abutting on the projection 125 of the chip 120.

Therefore, according to the first aspect of the present invention, the distance S between the connected pipes 101 and 102 and the distance T from the initial contact position of the lock bolt 111 to the projection 125 in each chip 120 are designed. By setting, the connected pipes 101 and 102 can slide in the axial direction X within a preset range, and exceed the set range.
When the external force to slide 102 is
When the connection pipes 101 and 102 slide on the lock bolt 11, the projection 125 of the tip 120
Blocked by contact with 1.

According to the first aspect of the present invention, the sliding of the connected tubes 101 and 102 is prevented by the contact between the lock bolt 111 and the convex portion 125 of the chip 120, so that the bite teeth 121 of the chip 120 are broken. Strength, tip 120
By designating the breaking strength of the convex portion 125, the breaking strength of the lock bolt 111, and the like, the lock bolt 11
It is possible to designly set the maximum stopping force due to the contact between the projection 1 and the projection 125 of the chip 120.

According to the first aspect of the present invention, the storage portion 110
Chip 120 by lock bolt 111 screwed to
Biting teeth 121 are pressed against the outer peripheral surfaces of the connected pipes 101 and 102. Therefore, just by tightening the lock bolt 111 with a predetermined torque, the biting teeth 121 of the chip 120 can be connected to the connected pipes 101 and 102 at an appropriate pressure. The pressure can be brought into pressure contact with the outer peripheral surface of the pipe 102, and the pressure at which the biting teeth 121 of the tip 120 can be pressed into contact with the outer peripheral surfaces of the connected tubes 101 and 102 can be adjusted only by adjusting the tightening torque of the lock bolt 111.

Further, according to the first aspect of the present invention, each connected pipe 1
Since the two or more chips 120 mounted on the outer peripheral surfaces of the connection pipes 01 and 102 are arranged at positions where the pressing forces on the connected pipes 101 and 102 due to the pressure contact of the lock bolts 111 are balanced. Connected pipe 1 by 111
Even when the tip 120 is pressed against the outer peripheral surfaces of the connection pipes 01 and 102, the socket pipe 103 and the tightening rings 104 and 105 loosely fitted to the connection pipes 101 and 102 and the connection pipe 10
With gaps W5 and W6 secured between
The connected tubes 101 and 102 can be connected.

According to the second aspect of the present invention, as shown in FIG.
0, the connecting rings 104 and 105 are connected to the connected pipes 101 and 102.
Since the opening 113 for inserting and taking out the chip 120 from the outside to the inside of the storage part 110 in a state of being loosely fitted to the outside is formed, even after the telescopic flexible pipe joint 100 is used for the pipeline, Lock bolt 1 screwed into storage section 110
11 is simply removed from the storage section 110, that is, the connected pipes 101,
Without removing 102 from the telescopic flexible fitting 100;
The chip 120 can be put in and out of the storage section 110.

According to the third aspect of the present invention, as shown in FIG. 5, the lock ring 20 separate from the tightening rings 204 and 205 is provided.
6,207 are formed with two fastening rings 2
A plurality of connecting bolts 2 for connecting the components 04 and 205 to each other
Since the lock rings 206 and 207 are detachably fixed to the tightening rings 204 and 205 by two or more connecting bolts 208 in the reference numeral 08, and the housing portions 210 are attached to the tightening rings 204 and 205, FIG. By fixing the lock rings 206 and 207 to the tightening rings g and h in the illustrated conventional telescopic flexible pipe joint a using the connecting bolts 208, the storage portions 210 are attached to the tightening rings g and h. Can be.

According to the fourth aspect of the present invention, the lock rings 206, 2
07 is divided into two or more in the axial direction (FIG. 4).
6) is added to the invention of claim 3, so that even if the conventional telescopic flexible pipe joint a shown in FIG. Without removing the connected pipes b, c connected by the telescopic flexible pipe joint a from the telescopic flexible pipe joint a.
Then, the lock rings 206 and 207 are
Can be fixed.

According to the third aspect of the present invention, a plurality of connecting bolts 2 for connecting the two tightening rings 204 and 205 to each other are provided.
Since the lock rings 206 and 207 are fixed to the tightening rings 204 and 205 by two or more connecting bolts 208 in the reference numeral 08, the lock rings 206 and 207 are connected to the tightening ring 204 using all the plurality of connecting bolts 208. , 205 are not necessarily fixed.

For this reason, according to the present invention, even if the lock rings 206 and 207 are divided into two in the axial direction (see FIG. 4), the lock rings 206 and 207 may be divided into two.
07 is fixed to the tightening rings g, h of the conventional telescopic flexible pipe joint a shown in FIG. 6 using the connecting bolts 208 when the two tightening rings g, h are connected to each other. Figure 6 Combining
Without removing all the connecting bolts k on one half of the fastening rings g, h in the illustrated plurality of connecting bolts k, one or more of the connecting bolts k on one half of the fastening rings g, h are not removed. By not removing the bolt k, the transported objects such as gas, water, oil, etc., which are being transported in the pipeline, do not leak out of the seal portion of the flexible joint a, so that the flexible joint a is tightened. The lock rings 206 and 207 can be fixed to the rings g and h.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS.
The telescopic flexible pipe joint 100, which is an example to which both the inventions of claim 2 and claim 2 are applied, has two connected pipes 101, 1
02 are arranged in series with an interval S, and the connected pipe 10
A socket tube 103 loosely fitted to the outside of each of the connected tubes 101, 102 has a tube end 101a,
Two tightening rings 104 and 105 loosely fitted to the outside of the connected tubes 101 and 102 are arranged on both sides of the socket tube 103 so as to span six connecting bolts 106.
The rubber packing rings 107 and 108 sandwiched between the tapered surfaces of the inner surfaces of both ends of the socket tube 103 and the outer peripheral surfaces of the connected tubes 101 and 102 are connected to each other by the tightening ring 1.
The pipes 104 and 105 are pressed against the outer peripheral surfaces of the pipes 101 and 102 to seal the pipes 101 and 102 slidably in the axial direction X.

The expandable and contractible flexible pipe joint 100 has six chips 120 arranged at equal intervals in the circumferential direction on the outer peripheral surface of each of the connected pipes 101 and 102, and the pipe ends of the connected pipes 101 and 102 are connected to each other. Biting teeth 1 extending toward 101a and 102a
21 are housed in a housing 110 formed in the fastening rings 104 and 105, and the two connected pipes 101 and 102
Are movable only in the axial direction X1 that is separated from each other, and the bite teeth 121 are pressed against the outer peripheral surfaces of the connected pipes 101 and 102 by a lock bolt 111 screwed to the storage portion 110, and the connected pipes are pressed by the press-contact. The pressing force to 101 and 102 is balanced.

By this balance, the socket tube 103 and the fastening rings 104 and 105 and the connected tubes 101 and 1 are connected.
02 are formed between the connection pipe 10 and the connection pipe 10 by the existence of the gaps W5 and W6.
The reference numerals 1 and 102 are capable of bending in the directions of the double arrows Z5 and Z6 with a contact point between the tip 120 and the lock bolt 111 as a fulcrum. Further, a lock nut 112 for preventing loosening is screwed to each lock bolt 111.

The telescopic flexible pipe joint 100 further includes
20, the lock bolt contact surface 122 is
The connected pipes 101, 102 gradually move from the end 123 near the pipe ends 101a, 102a toward the other end 124 of the pipe 102.
The end 123 of the tapered surface which is close to the outer peripheral surface of the connecting pipe 101 and 102 is in contact with the lock bolt 111 at an end 123 separated from the initial contact position of the lock bolt 111 by the distance T. Convex part 125 that prevents sliding
A chip 120 is inserted into the storage portion 110 of the tightening rings 104 and 105 from outside to inside of the storage portion 110 with the tightening rings 104 and 105 loosely fitted to the outside of the connected tubes 101 and 102. An opening 113 for taking in and out is formed.

Incidentally, in the flexible joint 100, the number of the connecting bolts 106 is six, and the packing ring 10 is provided.
7 and 108 are made of rubber.
The packing rings 107 and 108 are not limited to those made of rubber, but may be made of synthetic resin such as Teflon (a registered trademark of DuPont, USA). It may be a fibrous material used for water pipes or the like, depending on the type of transported goods transported in the pipeline.

In the telescopic flexible pipe joint 100, the six chips 120 are arranged at equal intervals in the circumferential direction on the outer peripheral surface of each of the connected pipes 101, 102, and the connected pipes 101, 102 by the lock bolt 111. The pressing force is balanced by two or more chips 12 that balance the pressing force.
The arrangement of 0 is not limited to the arrangement at equal intervals in the circumferential direction on the outer peripheral surfaces of the connected pipes 101 and 102, and may be, for example, an arrangement of a flexible joint 200 described later.

The telescopic flexible pipe joint 100 is an example of an embodiment to which both the first and second aspects of the present invention are applied. Although formed, in the telescopic flexible pipe joint according to claim 1, since the presence or absence of the opening 113 in the storage portion 110 is not limited, the storage portion 110 may not have the opening 113.

Next, referring to FIG. 3, FIG. 4, and FIG. 5, the expansion and contraction flexible which is an example in which each of the first, second, third, and fourth inventions is applied. The pipe joint 200 will be described. However, in the description of the telescopic flexible pipe joint 200, the same members as those of the telescopic flexible pipe joint 100 are denoted by the same reference numerals as those of the telescopic flexible pipe joint 100.
The description of the same structure as 00 is omitted.

In FIG. 3, FIG.
As shown in FIG. 5, a housing 210 is formed on lock rings 206 and 207 separate from the tightening rings 204 and 205, and six connecting bolts for connecting the two tightening rings 204 and 205 to each other. The lock rings 206 and 207 are detachably fixed to the tightening rings 204 and 205 by the four connecting bolts 208 in 208, and the storage portions 21 are attached to the tightening rings 204 and 205.
0 is provided, and the chip 12 is inserted into the storage portion 210 from the outside of the storage portion 210 while the lock rings 206 and 207 are loosely fitted to the outside of the connected tubes 101 and 102.
An opening 213 for taking in and out 0 is formed.

Each of the lock rings 206 and 207 is divided into two parts in the axial direction so that the lock pieces 206a, 206b and 2
07a, 207b, and each lock piece 206
a, 206b, 207a, and 207b are fastened to the fastening ring 2 by two of the six connecting bolts 208.
04, 205, and detachably fixed to the connecting bolt 211.
Are connected to each other.

In the flexible joint 200, the four pipes mounted on the outer peripheral surfaces of the connected pipes 101 and 102, respectively.
The two chips 120 are arranged two by two in line symmetry with respect to a dividing line that divides the lock rings 206 and 207 into two in the axial direction.
The pressing force to 102 is balanced.

The telescopic flexible pipe joint 200 is an example of an embodiment to which the first, second, third and fourth aspects of the present invention are applied.
In the above, the lock rings 206 and 207 are divided in the axial direction. However, in the telescopic flexible pipe joint according to the third aspect, whether or not the lock ring is divided in the axial direction is not limited. It may be a thing.

In the flexible joint 200, the lock rings 206 and 207 having the storage portion 210
08, it is fixed to the tightening rings 204 and 205, and the storage portions 210 are formed in the tightening rings 204 and 205.
In the telescopic flexible pipe joint according to claim 1, the tightening rings 204, 2 are provided.
It is sufficient that the storage part 210 is formed in the locking part 204 and the method of forming the storage part 210 in the fastening rings 204 and 205 is not limited. Adhesive or binding bolt 20
The storage portion 210 may be formed on the tightening rings 204 and 205 by being fixed to the tightening rings 204 and 205 with a bolt or the like other than the bolt 8.

Further, in the telescopic flexible pipe joint 200, the lock rings 206 and 207 separate from the tightening rings 204 and 205 have the storage portion 210, and the lock rings 206 and 207 are
The storage portions 210 are formed on the tightening rings 204 and 205 by being fixed to the fitting rings 04 and 205. In the telescopic flexible pipe joint according to claim 1, the tightening rings 204 and 205 and the storage portion are individually formed. The storage portion may be manufactured and fixed to the tightening rings 204 and 205 by means of welding, bonding, bolts, or the like, and the storing portion 210 may be formed in the tightening rings 204 and 205.

[0046]

According to the first aspect of the present invention, the sliding of the connected pipe in the axial direction is prevented by the contact between the lock bolt and the projection of the tip.
By designably setting the distance from the initial contact position of the lock bolt to the convex portion in each tip, the connected pipe can slide in the axial direction within a preset range, and the setting range When an external force that slides the connected pipe in the axial direction beyond it acts on the connected pipe during an earthquake or the like,
There is an effect that the sliding of the connected pipe can be prevented against the external force.

According to the first aspect of the present invention, the breaking strength of the biting teeth of the tip, the breaking strength of the projecting portion of the chip, the breaking strength of the lock bolt, and the like are designed and set, so that the projecting portion of the lock bolt and the tip are designed. The maximum blocking force by contact with the pipe can be set in design, so even if the sliding of the connected pipe is prevented by the contact between the lock bolt and the convex part of the tip, it is necessary to connect with the pipe. Before the main equipment such as storage tanks, pumps, and various valve mechanisms are damaged due to the above-mentioned blockage, the bite teeth of the chip, the convex part of the chip or the lock bolt, etc. are broken, and the main equipment is damaged. There is also an effect that it can be prevented from occurring.

According to the first aspect of the present invention, since the biting teeth of the tip are pressed against the outer peripheral surface of the connected pipe by the lock bolt screwed into the storage portion, the lock bolt is merely tightened with a predetermined torque. With this, the biting teeth of the chip can be pressed against the outer peripheral surface of the connected pipe with an appropriate pressure, and the pressure at which the biting teeth of the chip are pressed against the outer peripheral surface of the connected pipe can be adjusted simply by adjusting the tightening torque of the lock bolt. Can also be adjusted.

Further, according to the first aspect of the present invention, the connection is made in a state where gaps W5 and W6 (see FIG. 2) are secured between the socket tube and the tightening ring loosely fitted to the connection tube and the connection tube. Since the pipes can be connected, there is also an effect that the connected pipes can be bent in the directions of the double arrows Z5 and Z6 (see FIG. 2) with the contact portion between the tip and the lock bolt as a fulcrum.

According to the second aspect of the present invention, the chip can be put in and out of the storage portion without removing the connected pipe connected by the telescopic flexible pipe joint from the telescopic flexible pipe joint. Even after using the pipe joint for the pipeline, the lock piece can be inspected, repaired, replaced, etc. without removing the connected pipe connected by the telescopic flexible pipe joint from the telescopic flexible pipe joint. This has the effect.

According to the third aspect of the present invention, the lock rings are fixed to the tightening rings g and h in the conventional telescopic flexible pipe joint a shown in FIG.
3. A telescopic flexible pipe joint a according to claim 1 or 2, wherein a storage portion can be attached to the h, without performing any processing on the conventional telescopic flexible pipe joint a. This has the effect that the joint can be modified.

According to the fourth aspect of the present invention, even if the conventional telescopic flexible pipe joint a is already used for the pipeline, the connected pipe connected by the telescopic flexible pipe joint a can be expanded and contracted. Since the lock ring can be fixed to the tightening rings g and h of the conventional telescopic flexible pipe joint a using the connecting bolts without removing it from the flexible pipe joint a, the conventional telescopic flexible pipe joint a has already been used. Telescopic flexible pipe joint a even when used in pipelines
The conventional telescopic flexible pipe joint a can be remodeled into the telescopic flexible pipe joint according to claim 3 without removing the connected pipe connected with the telescopic flexible pipe joint a. .

Further, according to the fourth aspect of the present invention, the transported objects such as gas, water and oil in the pipeline in which the conventional telescopic flexible pipe joint a is used are leaked from the telescopic flexible pipe joint a. Instead, the lock ring can be fixed to the tightening rings g and h of the telescopic flexible pipe joint a using the connecting bolts, so that the conventional telescopic flexible pipe joint a is already used for the pipeline. Therefore, even when the transported object is being transported in this pipeline, the conventional telescopic flexible pipe joint a can be replaced with the telescopic flexible pipe joint according to claim 3 without stopping the transport. It also has the effect that it can be modified.

[Brief description of the drawings]

FIG. 1 is a side view showing one embodiment of the first and second embodiments.

FIG. 2 is a cross-sectional view showing a part of the cross section taken along line BB of FIG.

FIG. 3 is a side view showing an example of the first, second, third, and fourth embodiments.

FIG. 4 is a plan view showing a lock ring in FIG. 3;

FIG. 5 is a cross-sectional view showing a part of the cross section taken along line CC of FIG.

FIG. 6 is a front view showing an example of a conventional product in a half section.

FIG. 7 is a side view showing another example of a conventional product.

8 is a sectional view taken along line AA of FIG.

[Explanation of symbols]

100, 200 Telescopic flexible pipe joints 101, 102 Connected pipes 101a, 102a Pipe ends 103a and 102a of both connected pipes 103 Socket pipes 104, 105, 204, 205 Tightening rings 106, 208 Coupling bolts 107, 108 Packing rings 110, 210 Storage part 111 Lock bolt 113, 213 Storage part opening 120 Chip 121 Chip biting tooth 122 Chip lock bolt abutment surface 123 End of lock pipe abutment surface of chip near the pipe end of lock pipe abutment surface 124 The other end of the lock bolt contact surface of the chip 125 The convex portion of the chip 206, 207 Lock ring S Spacing between both connected pipes X Axial direction of connected pipe X1 Axial direction where both connected pipes are separated from each other

Claims (4)

(57) [Claims] 1. Two connected pipes are arranged in series at an interval, and a socket pipe loosely fitted to the outside of the connected pipe is arranged straddling opposed pipe ends of the two connected pipes. Two fastening rings loosely fitted to the outside of the connected pipe are arranged on both sides of the socket pipe and connected to each other by a plurality of connecting bolts, and the inner surface of both ends of the socket pipe and the outer peripheral surface of the connected pipe are connected to each other. In a telescopic flexible pipe joint, a packing ring sandwiched between the pipes is pressed against the outer peripheral surface of the connected pipe by the tightening ring, and each connected pipe is slidably sealed in its axial direction. The two or more chips mounted on the outer peripheral surface of each connected pipe have bite teeth extending toward the pipe end of the connected pipe, and each of the chips has a storage portion formed in the tightening ring. It is housed inside, and both connected pipes can be moved only in the axial direction separated from each other, The biting teeth are pressed against the outer peripheral surface of the connected pipe by a lock bolt screwed into the pipe, and are arranged at positions where the pressing force against the connected pipe due to the press contact is balanced. The surface is a tapered surface that gradually approaches the outer peripheral surface of the connected pipe from the end near the pipe end to the other end of the connected pipe, and is separated from the initial contact position of the lock bolt on the tapered surface. A telescopic flexible pipe joint characterized in that a convex portion is formed at an end near the pipe end to abut on a lock bolt to prevent sliding of the connected pipe. 2. A receiving portion formed in the fastening ring is formed with an opening through which a chip is inserted into and taken out of the receiving portion while the fastening ring is loosely fitted to the outside of the connected pipe. The telescopic flexible pipe joint according to claim 1. 3. A storage portion is formed in a lock ring separate from the tightening ring, and the lock ring is formed by two or more connecting bolts among a plurality of connecting bolts connecting the two tightening rings to each other. The telescopic flexible pipe joint according to claim 1 or 2, wherein the joint is detachably fixed to the tightening ring, and the accommodating portion is attached to the tightening ring. 4. The telescopic flexible pipe joint according to claim 3, wherein the lock ring is divided into two or more in the axial direction.