JP2008215607A - Bellows non-thrust expansion pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bellows non-thrust expansion pipe joint eliminating the need of an excessive anchor against an internal pressure thrust, having a simple internal structure, having no projections, usable also in the right-angled direction to the axis thereof, and carrying the internal pressure thrust. <P>SOLUTION: The state of contact between a pushing guide member 15 and a pushing force receiving seat member 10 is maintained through the pressing guide member 15 so biased as to be brought into contact with both the pressing force receiving seat member 10 and a guide flange 4 regardless of the displacement of the guide flange due to the extension or retraction of a pipe. Then, a bellows non-thrust expansion pipe joint BT1 so formed as to form a thrust carrying means 100 for always carrying the internal pressure thrust on a tie rod 7 is formed. The state of contact between the pressing guide 44 and the pressing force receiving seat 51. Then, a bellows non-thrust expansion pip joint BT2 so formed as to form a thrust carrying means 110 for always carrying the internal pressure thrust on the tie rod 7 is formed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a bellows type expansion joint, and more particularly to a bellows type thrustless expansion joint that can easily cope with the displacement of the expansion joint.

  Conventionally, when connecting various production facilities and storage facilities via piping members to transfer steam, gas, LNG, water, oil, etc., expansion pipe joints are used to absorb expansion and contraction of piping. It has been. In addition, a bellows-type expansion joint with a bellows for absorbing expansion and contraction is generally known.

  Bellows type expansion joints are mainly axial type that absorbs axial displacement, axial bending type that absorbs axial bending displacement, right angle type that absorbs displacement in the direction perpendicular to the axis, and universal type that absorbs displacement in all planes. It has been known. Furthermore, a single type using a single bellows and a double type bellows-type expansion pipe joint using a plurality of bellows are used.

  When the temperature of the pipes restrained between the facilities changes, a force is generated to expand and contract the pipes, and a load is applied to the connected equipment. In order to alleviate this, when a single or double expansion pipe joint is provided, this time, both corners holding the expansion pipe joint will be expanded by internal pressure thrust, and the force will be derived in the form of warping of the piping connected through the corner, That depends on equipment and equipment. For this reason, when the force applied to the equipment in the piping that changes in temperature exceeds the permissible limit, a single or double expansion pipe joint is provided at an appropriate position, and an anchor that resists internal pressure thrust at the corner in order to perform its function. Is laid.

  If it is said structure, since a corner does not spread, the force applied to an apparatus can be suppressed without the piping connected via a corner warping.

  FIG. 12 shows an example of a single bellows type expansion joint BT3 which is a basic type of bellows type expansion joint. As shown in the drawing, the bellows-type expansion joint BT3 has a configuration in which a bellows 1 is interposed between end tubes 2 and 2, and each end tube 2 is provided with a flange 3 and a guide flange 4. . The guide flange 4 is fixed to the end tube 2 (provided with a rib 5 if necessary), and the bellows 1 is held within a predetermined interval by a tie rod 7 stretched between the guide flanges 4 on both sides. It has a configuration.

  The tie rod 7 is a guide for suppressing the elongation in the axial direction, and has a role of a limiting bolt for preventing the joint from being damaged if a failure occurs in the anchor of the piping equipment. Yes. Therefore, it has the 1st nut 7a and the 2nd nut 7b for restrict | limiting a maximum elongation allowance, and it is set as the structure which forms the lock nut in a pair and fixes the set length. Reference numeral 6 denotes a set bolt which is attached until the installation of the piping equipment is completed, and after installation, the nut 6a is loosened and removed.

  FIG. 13 shows a basic form of a bellows-type expansion joint (referred to as a balance type) BT4 that cancels the internal pressure thrust. This bellows type expansion joint BT4 is a basic type of straight pipe balance / straight type, straight pipe balance / tee type, curved pipe balance / elbow type, and a plurality of sets of bellows 1A, 1B, 1C are connected to each other. It is set as the structure provided with the tie rod 7A, 7B hold | maintained within a fixed space | interval individually or entirely.

  Moreover, in order to mount each tie rod, a guide flange 4A and a second guide flange 4B provided separately are provided.

  Conventionally, tie rods in single-type and double-type bellows type expansion joints are normally in a free state in the role of a safety device for preventing the bellows from abnormally extending. In the balance type bellows type expansion joint, it functions as a force transmission part between the bellows.

  The straight pipe balance straight type as an expansion joint that counteracts internal pressure thrust has a complicated internal structure, so it cannot be used in the direction perpendicular to the axis, and it cannot be used for piping of powder or slurry fluid. The straight tube balance tee type has large protrusions in the direction perpendicular to the axis and requires a large space. In addition, the straight pipe balance tee type encloses fluid in the protrusions, so it cannot be used if you do not want to seal. The curved pipe balance elbow type has a large projection that is specified in the direction opposite to the expansion and contraction direction, requires a large space in that direction, and encloses fluid from the projection, so if you do not want to enclose it Cannot be used.

The straight tube balance / straight type is limited to the axial direction because the internal structure is a concave-convex inset type. In the straight tube balance tee type, the stream side bellows is as simple as a single unit and can be used in the direction perpendicular to the axis, but requires a large tee-like projection.
The curved pipe balance elbow type is as simple as a single unit and can be used in a direction perpendicular to the axis, but requires a long protrusion in the direction opposite to the expansion / contraction direction.

  Therefore, there is a demand for an expansion joint that cancels out the internal pressure thrust with a simple structure. For example, a washer that connects an operating side bellows and a balance side bellows via a tension rod and can roll in the tilting direction of the tension rod. An application of an expansion bellows having the above has already been filed (see, for example, Patent Document 1).

Further, in order to absorb an excessive displacement of the three axial directions in the axial direction and the two axial directions orthogonal to the axial direction, an inner guide link outer guide link provided on the intermediate outer peripheral portion of the bellows is brought into contact with the inner peripheral portion via the arcuate engagement portion. In this way, an application has already been filed for a bellows-type expansion pipe joint in which an outer guide link is slidably held in a long hole provided in an arm projecting from a flange (see, for example, Patent Document 2).
JP-A-8-14457 Japanese Patent Laid-Open No. 10-141565

  In the conventional single-type and double-type bellows type expansion joints, there is a problem that a large force is applied to the anchor point due to the internal pressure thrust and the bellows reaction force.

  Further, a pressure balanced expansion joint using a plurality of bellows is a large device and is not suitable for a narrow place such as a compressor inlet / outlet pipe. In particular, the inner surface is complicated, and it is not suitable as a piping device for a granular material or slurry fluid.

  For this purpose, there is a demand for an expansion joint having a simple and compact structure with no internal pressure thrust applied to the anchor point.

  An object of the present invention is to solve the above problems by eliminating the need for an excessive anchor to counter internal pressure thrust, having a simple internal structure, having no protrusions, and being used in a direction perpendicular to the axis, and guaranteeing the internal pressure thrust. It is to provide a shapeless thrust expansion joint.

  In order to achieve the above object, the invention according to claim 1 is a tie rod that connects pipes connected via bellows and stretches guide flanges provided on both sides sandwiching the bellows of the end pipe connected to both ends of the bellows. A plurality of expansion joints, wherein both ends of the tie rod are extended through the guide flanges on both sides, and a pressing force receiving seat member for fitting the extended portion is disposed in the extended portion, Fastened by a nut member provided at the tip of the tie rod, disposed between the pressing force receiving seat member and the guide flange, between the pressing force receiving seat member and the end tube, and Regardless of the displacement of the guide flange due to expansion or contraction of the pipe, the pressure guide member and the pressure force are pressed through the pressure guide member biased to contact both the pressure force receiving seat member and the guide flange. Only to maintain contact with the seat member, and characterized in that the bellows type continuously thrust expansion joints to form a thrust collateral means for collateral always tie rod internal pressure thrust.

  According to the invention of claim 1 having the above-described configuration, the internal pressure thrust generated by the expansion and contraction of the pipe is tie-roded via the thrust securing means formed by the guide flange, the pressing guide member, the pressing force receiving member, and the nut member. Therefore, it is possible to obtain a bellows type non-thrust expansion / contraction pipe joint that reliably secures the internal pressure thrust with a tie rod at all times.

  The invention according to claim 2 is characterized in that the pressing force seat member has a tie rod insertion hole in the central portion and a contact surface that contacts the pressing guide member on the side facing the end tube. The contact surface is an inclined surface inclined in a direction from the surface of the guide flange toward the rising end tube, and an opening angle formed between the inclined surface and the surface of the guide flange is set to an acute angle. A first abutting portion that abuts on the guide flange and a second abutting portion that abuts on the guide flange, the surface of the guide flange being movable through the second abutting portion, and the first abutting portion on the inclined surface An urging member for urging the portion in the direction in which the portion is pressed is disposed.

  According to the invention according to claim 2 having the above-described configuration, even if the guide flange is displaced due to expansion and contraction of the piping, the opening angle between the guide flange surface and the inclined surface of the pressing force seat member is an acute angle. The pressing guide member is urged so as to bite into a wedge shape, so that the displacement of the guide flange can be reliably transmitted to the tie rod, and the internal pressure thrust can be always secured to the tie rod. Further, since the contact is made on the inclined surface, the horizontal component in the direction orthogonal to the axial direction of the internal pressure thrust is reduced, and the size of the tie rod can be set to an appropriate size.

  According to a third aspect of the present invention, the pressing force receiving seat member is a rectangular pressing force receiving seat having a rectangular cross section, the pressing guide member is a pressing guide block having a rectangular cross section, and a flange and a guide flange of an outer peripheral portion of the end tube are provided. The rib member provided between them is a rib member having a pair of left and right guide pieces for guiding both side portions of the pressing guide block, and the side surface portion of the contact portion between the rectangular pressing force receiving seat and the pressing guide block is uneven. It is characterized by having a fitting configuration.

  According to the invention of claim 3 having the above-described configuration, it is possible to guide the pressing guide block that moves according to the expansion and contraction of the pipe, and to prevent the rotation of both the pressing guide block and the square pressing force receiving seat. it can.

  The invention according to claim 4 is provided with a step on the upper part of the second contact portion of the pressing guide block to dispose a biasing member mounting portion, and covers both sides of the biasing member mounting portion with the guide pieces, Further, a cover member that covers the upper part is provided.

  According to the invention which concerns on Claim 4 which has said structure, a biasing member can be hold | maintained in an action | operation area | region, and a biasing member can be act | operated appropriately.

  According to a fifth aspect of the present invention, the pressing guide block is provided with a slot or U-shaped groove portion that allows the insertion of the tie rod regardless of the displacement of the pressing guide block, and the top portion of the rectangular pressure receiving seat. A spherical concave portion is provided on the nut member, and the nut member is fastened with a spherical washer that matches the spherical concave portion, so that the square pressure receiving seat can be eccentric with respect to the tie rod. It is said.

  According to the invention according to claim 5 having the above-described configuration, it is possible to cope with the core misalignment of the pipe, and the pressing guide block and the rectangular pressing force receiving seat can always be brought into contact with each other in a surface contact state.

  The invention according to claim 6 is characterized in that a tension member for connecting top portions of the tie rods is mounted.

  According to the invention according to claim 6 having the above-described configuration, a plurality of tie rods provided on the circumference can be displaced integrally, and a load applied to one predetermined tie rod can be reduced. Further, the tie rod can be protected from an abnormal urging force of the urging member.

  The invention according to claim 7 is characterized in that a pair of jig locking members having jig locking holes are arranged on the rib member so as to face both sides of the biasing member mounting portion.

  According to the invention of claim 7 having the above-described configuration, even if the urging member has a strong urging force, the jig that integrally pushes the urging member, the pressing guide member, and the pressing force receiving member is used. Thus, the urging member can be compressed and easily attached to the tie rod.

The invention according to claim 8 is characterized in that the pressing guide member is a roller-shaped pressing guide roller, the pressing force receiving seat member is a horizontally long pressing force receiving seat corresponding to the pressing guide roller, and a flange at an outer peripheral portion of the end tube. An arm rib is provided at a predetermined position on the circumference where the tie rod is disposed between the guide flange and the guide flange, and the tie rod is extended to the vicinity reaching the arm rib.
It is attached so as to abut on both the base end portion pivotally supported by the arm rib, the arm connecting portion connected to the tip end portion of the tie rod, and the laterally long pressing force receiving seat attached to the guide flange and the tie rod. An arm member provided with a tip portion that supports the pressed guide roller to be biased, and when the arm rib moves due to expansion and contraction of a pipe, a link mechanism is formed in which the arm member rotates around the arm connecting portion, Thrust securing means that a pressing guide roller provided at the tip of the arm member via a link mechanism abuts against the laterally long pressing force receiving seat regardless of the displacement amount of the guide flange, and always maintains an internal pressure thrust on the tie rod. It is characterized by forming.

  According to the invention which concerns on Claim 8 which has said structure, since the internal pressure thrust produced by expansion / contraction of piping is transmitted to a tie rod via a thrust ensuring means, an internal pressure thrust can always be reliably ensured with a tie rod.

  According to a ninth aspect of the present invention, the arm member is composed of a pair of arm members provided to face each other so as to sandwich the arm rib and the tip of the tie rod, and each arm member is rotated to the arm rib. A base end portion that is freely pivoted, a first arm that extends from the base end portion in the radial direction of the pipe and has the arm connecting portion, and an L shape from the distal end side of the first arm toward the bellows In addition to having a second arm that bends, a connecting plate that penetrates and connects the tip portions of each second arm is provided, and support rods are loosely fitted on both sides of the connecting plate, and a spherical washer. And both end portions in the axial direction of the pressing guide roller are mounted on the tips of the two support rods.

  According to the invention according to claim 9 having the above-described configuration, the two pieces of arm members sandwiching the arm rib provided between the flange of the end tube and the guide flange at a predetermined position on the circumference where the tie rod is disposed are used. Therefore, the tie rod is positioned at the center of the two arm members, and the pressure of the pressure guide provided at the tip of the arm member can be easily and reliably transmitted to the tie rod.

  According to a tenth aspect of the present invention, the pressure guide roller is slidably mounted through an insertion hole having a diameter larger than the diameter of the support rod, and the spring for biasing the pressure guide roller in the direction of the transfer plate A notch part which is provided with a member and the tie rod is disposed between the pressing guide roller and the transfer plate, and allows contact between the pressing guide roller and the pressing force receiving seat but does not allow contact with the tie rod. Is provided on the pressing guide roller.

  According to the invention of claim 10 having the above configuration, the pressing guide is always in contact with the guide flange and the pressing force receiving seat via the spring member that constantly biases the pressing guide in the tie rod direction. Can do.

  The invention according to claim 11 is characterized in that an extension member is attached to the tip of the tie rod, and the arm member is connected to the extension member.

  According to the eleventh aspect of the invention having the above-described configuration, in the initial state at the time of pipe installation, the position of the arm connecting portion is adjusted via the extension member so that the pressing guide is always placed between the guide flange and the pressing force receiving seat. It can arrange | position so that it may contact | connect.

  According to a twelfth aspect of the present invention, the length from the arm connecting portion to the distal end side of the first arm provided by bending the second arm is larger than the arm length from the base end portion to the arm connecting portion. By using a link mechanism that lengthens the arm length, the movement displacement of the arm rib due to expansion and contraction of the pipe is enlarged, and the pressing guide is moved.

  According to the invention according to claim 12 having the above-described configuration, since the pressing guide can be moved by increasing the amount of expansion / contraction displacement of the pipe, the bellows type thrustless expansion / contraction pipe joint that can respond sensitively to the expansion / contraction displacement, Become.

  According to the present invention, using the displacement of the end pipes on both sides of the bellows, the internal pressure thrust and the bellows reaction force are always secured by the tie rod, so that an excessive anchor is unnecessary regardless of the single bellows type, A bellows type thrustless expansion and contraction pipe joint that has a simple internal structure, has no projections, can be used in a direction perpendicular to the axis, and ensures internal pressure thrust and bellows reaction force can be obtained.

  Hereinafter, embodiments of a bellows type non-thrust expansion / contraction pipe joint according to the present invention will be described in detail with reference to the drawings.

  First, the configuration of the bellows-type no-thrust expansion / contraction pipe joint BT1 according to the first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic explanatory diagram of the whole, FIG. 2 is a view taken along arrow AA in FIG. 1, and FIG. 3 is a view taken along arrow BB in FIG. FIG. 4 is an enlarged view of a main part, FIG. 5 and FIG. 6 show a cross-sectional view of the main part, and FIG. 7 shows an enlarged view of the main part showing a concavity and convexity fitting configuration.

  As shown in FIG. 1, the bellows-type non-thrust expansion / contraction pipe joint BT1 according to the first embodiment of the present invention is similar to the above-described conventional single bellows-type expansion / contraction pipe joint BT3 (see FIG. 12). Each end tube 2 is provided with a flange 3 and a guide flange 4 with a bellows 1 interposed therebetween. The guide flange 4 is fixed to the end tube 2, and a plurality of tie rods 7 are stretched between the guide flanges 4 on both sides.

  When the pipe connected to the end tube 2 expands and contracts and the length is displaced, the displacement moves the end tube 2 and the guide flange 4 tries to move. In the present embodiment, the internal pressure thrust generated by the expansion and contraction of the pipe is always secured to the tie rod 7 via the thrust securing means 100.

  The thrust securing means 100 includes a pressing force receiving seat member 10 provided so as to fit the tie rod 7 between the nut members 13 and 14 provided at the distal end portion of the tie rod 7 and the guide flange 4, and the pressing force receiving seat member 10. A pressing guide member 15 having a first abutting portion 15a that abuts against the abutting surface (inclined surface 10a), and an urging member 16 that urges the pressing guide member 15 toward the pressing force receiving member. It is configured.

  The pressing guide member 15 includes a first abutting portion 15 a that abuts against the abutting surface of the pressing force receiving seat member 10, and a second abutting portion 15 b that abuts against the guide flange 4. The first contact portion 15a is always pressed against the contact surface (inclined surface 10a) through the contact.

  At this time, the pressing force receiving seat member 10 has a tie rod insertion hole 10d (see FIG. 5) in the center, and an inclined surface 10a is provided on the side facing the end tube as the contact surface. 10a and the guide flange surface are formed at an acute angle, and the pressing guide member 15 is pushed in a wedge shape through the urging member 16 into the acute angle opening, so that the guide flange 4 is displaced. Regardless, the first contact portion 15a is pressed against the inclined surface 10a.

  Further, the side surface portion of the abutting portion between the inclined surface 10a and the first abutting portion 15a is configured to have an uneven fitting structure, so that the pressing force receiving member 10 and the pressing guide member 15 do not rotate. It can contact correctly and reliably, and can maintain this contacted state. This concavo-convex fitting configuration can be constructed by projecting and providing a guide portion that fits and accommodates the other member in one of the members.

  With the configuration described above, the internal pressure thrust generated by the expansion and contraction of the pipe is transmitted from the guide flange 4 through the pressing guide member 15 to the nut members 13 and 14 from the pressing force receiving seat member 10 and secured to the tie rod 7. It becomes. Further, since the contact surface is the inclined surface 10a inclined in the direction from the guide flange surface toward the rising end tube 2, the horizontal component force in the direction orthogonal to the axial direction of the internal pressure thrust is reduced, and the tie rod 7 Can be set to an appropriate size.

  At this time, the low friction member 35 (shown by an imaginary line in FIG. 4) is formed on the contact portion between the inclined surface 10a and the first contact portion 15a and the contact portion between the second contact portion 15b and the guide flange 4. ) To facilitate sliding, even if the guide flange 4 is displaced due to contraction of the pipe, the pressing guide member 15 easily slides on the guide flange, and the pressing force receiving seat member 10 is reliably It is preferable that the structure comes into contact.

  Further, as shown in FIG. 3, the tie rod 7 and the thrust securing means 100 (100A, 100B, 100C, 100D) are equally arranged at four locations on the circumference. The number to be arranged may be three or six on the circumference, and can be appropriately selected depending on the size of the pipe and the magnitude of the internal pressure thrust. Further, by providing the plurality of tie rods 7 and the thrust securing means 100 equally arranged on the circumference, the internal pressure thrust is evenly loaded around the entire circumference of the pipe, so that no abnormal deformation occurs. Is preferred.

  In the first embodiment, the pressing force receiving seat member 10 is a rectangular pressing force receiving seat (10A, 10B) having a rectangular cross section, and the pressing guide member 15 is a pressing guide block (15A, 15B) having a rectangular cross section. . Further, as a rib member provided between the flange 3 and the guide flange 4 on the outer peripheral portion of the end tube 2, a rib member 5A having a pair of guide pieces for guiding the side surfaces of the pressing guide blocks (15A, 15B) is provided. The side surface portion of the abutting portion between the rectangular pressing force receiving seat (10A, 10B) and the pressing guide block (15A, 15B) has a concave-convex fitting configuration. Further, as shown in FIGS. 3 and 7A, the concave-convex fitting structure includes a rectangular pressing force receiving seat 10A having an inclined surface 10a in a central concave portion provided with a guide portion 10b on a side portion. A pressing guide block 15A having a size accommodated in the recess can be used. Further, as shown in FIG. 7 (b), a pressing guide block 15B having a first contact portion 15a in a central concave portion provided with a guide portion 15d on a side portion and a size accommodated in the concave portion. A square pressing force seat 10B can also be used. Regardless of the configuration, the rectangular pressing force receiving seat and the pressing guide block have a concave-convex fitting configuration, thereby maintaining the state where the inclined surface 10a and the first contact portion 15a are in contact with each other. The rotation of the pressing force receiving seats 10A and 10B can be prevented.

  Therefore, even if the pressure guide member 15 (the pressure guide blocks 15A and 15B) moves in the radial direction in conjunction with the expansion and contraction of the piping, the pressure force receiving seat member 10 (the square pressure force receiving seats 10A and 10B) and the pressure guide. The member 15 (pressing guide blocks 15A and 15B) can be contacted correctly and reliably without rotating, and the contacted state can be maintained. Here, 8 is a rib base, and a pair of guide pieces are fixed to the rib base 8 to form a rib member 5A.

  In addition, the urging member 16 is disposed between the pressing guide member 15 (the pressing guide blocks 15A and 15B) and the end tube 2. For this purpose, a step is provided on the upper portion of the second contact portion 15b. A force member mounting portion is provided. This urging member mounting portion is configured to cover both sides with the rib member 5A having the above-described guide piece and further cover the upper portion of the urging member 16 with a cover member 17 (see FIGS. 5 and 6).

  Therefore, the urging member 16 can be accommodated in the urging member mounting portion, and various types of urging members 16 can be adopted and mounted. For example, the coil spring 16A shown in FIG. 5 can be stored, or the buckling plate 16B shown in FIG. 6 can be stored and used.

  In addition, other urging members and urging devices can be used, and the type of the urging member 16 is not particularly limited.

  Regardless of which method is used, the urging member 16 that urges the pressing guide member 15 in the direction of the pressing force receiving seat member 10 over the entire range of the expansion / contraction range of the bellows 1 is attached. It is important to keep it.

  Further, a long hole-shaped or U-shaped groove portion 15c (see FIGS. 3 and 7) that allows the pressing guide member 15 (the pressing guide blocks 15A and 15B) to pass through the tie rod 7 regardless of the displacement of the pressing guide member. ), A spherical recess 10c (see FIG. 5) is provided at the top of the pressing force receiving member 10, and the nut members 13 and 14 are fastened with a spherical washer 11 that matches the spherical recess 10c. It is configured to do. The two nut members 13 and 14 are fastened to each other via the washer 12, so that the nut can be fastened in a lock nut state to prevent the nut from loosening. Therefore, the pressing force receiving seat member 10 (rectangular pressing force receiving seats 10A and 10B) fixed in a state of being fitted to the tie rod 7 through the tie rod insertion hole 10d can be aligned with the tie rod 7. Even if some misalignment occurs in the piping, the pressing force receiving seat member 10 (square pressing force receiving seats 10A and 10B) and the pressing guide member 15 (pressing guide blocks 15A and 15B) are always in surface contact. .

  Further, as shown in FIGS. 1 and 2, by attaching a tension member 22 that connects the connecting members 21 provided on the top of the tie rod 7, a plurality of tie rods 7 that are equally distributed on the circumference are integrated. And the load on one predetermined tie rod can be reduced. In addition, when the turnbuckle 23 is provided on the tension member 22, a plurality of tie rods on the circumference can be relatively helped to prevent the tie rod from being bent.

  As described above, a plurality of tie rods 7 are provided approximately equally on the outer peripheral portion of the end tube 2, and thrust securing means 100 (for example, 100A, 100B, 100C, 100D) is interposed in each tie rod 7, Further, since the top portions of the tie rods 7 including the pressing force receiving member 10 that interposes the spherical washer 11 are connected to each other by the tension member 22 including the turnbuckle 23, the abnormal biasing force of the biasing member is reduced. Even if it occurs, the plurality of tie rods 7 can be displaced integrally, and damage to the tie rods 7 can be prevented.

  Further, a pair of ear-shaped jig locking members 20 having jig locking holes 20a are arranged on the rib member 5A so as to face both sides of the biasing member mounting portion. If it is this structure, even if it is the urging member 16 with strong urging | biasing force, a part of jig | tool will be latched (hooked) to the jig | tool latching hole 20a, The urging member 16 can be compressed and easily assembled using a jig (not shown) that integrally presses the pressing force receiving seat member 10, and the apparatus can be assembled safely. The jig locking member 20 can be fixed to either the guide piece or the rib base 8 that forms the rib member 5A, or across both.

  Next, the configuration of the bellows-type thrustless expansion joint BT2 according to the second embodiment of the present invention will be described with reference to FIGS. FIG. 8 is a schematic explanatory diagram of the whole, FIG. 9 shows a CC arrow view of FIG. 8, and FIG. 10 shows a DD arrow view of FIG.

  The bellows type non-thrust expansion / contraction pipe joint BT2 according to the present invention also has a configuration in which the bellows 1 is interposed between the end pipes 2 and 2 in the same manner as the bellows type non-thrust expansion / contraction pipe joint BT1 described above. The end tube 2 is provided with a flange 3 and a guide flange 4. The guide flange 4 is fixed to the end tube 2 (a rib 5 is provided if necessary), and a tie rod 7 is stretched between the guide flanges 4 on both sides.

  When the pipe connected to the end tube 2 expands and contracts and the length is displaced, the displacement moves the end tube 2 and the arm rib 3 tries to move. In the present embodiment, this displacement is used to transmit the displacement of the guide flanges 4 and 4 to the tie rod 7 via the thrust ensuring means 110.

  For this purpose, an arm rib 38 is provided between the flange 3 of the end tube 2 and the guide flange 4 at a predetermined position on the circumference where the tie rod 7 is disposed, and the tie rod 7 is extended to the vicinity reaching the arm rib 38. An end portion 39 pivotally supported by the arm rib 38, an arm connecting portion 40 connected to the tip end portion of the tie rod 7, and a pressing force receiving seat 51 attached to the guide flange 4 and the tie rod 7. The arm member 41 including a tip portion that supports the pressing guide 14 that is urged so as to be in contact with both of them is provided.

  Further, when the arm rib 38 moves due to the expansion and contraction of the pipe, a link mechanism is formed in which the arm member 41 rotates around the arm connecting portion 40, and a pressing guide 44 provided at the tip of the arm member 41 via the link mechanism is provided. The displacement of the guide flange 4 is transmitted to the tie rod 7, and the thrust securing means 110 is formed to constantly secure the internal pressure thrust to the tie rod 7.

  With this configuration, the internal pressure thrust generated by the expansion and contraction of the pipe is transmitted to the tie rod 7 via the thrust securing means 110, so that the internal pressure thrust can always be reliably secured with the tie rod. Further, since the internal structure is not complicated and there are no projections, the inner cylinder 30 can be provided.

  Furthermore, this thrust ensuring means 110 is configured to be equally distributed at a plurality of locations on the circumference of the pipe. For example, it is equally distributed on the circumference and is provided at four locations (see FIGS. 9 and 10). The number of arrangements varies depending on the size of the pipe. And you may provide in 6-8 places.

  Further, an arm length T1 from the base end portion 39 to the arm connecting portion 40, and an arm connecting portion so that the link mechanism moves the pressing guide 44 by expanding the displacement of the arm rib 38 due to expansion and contraction of the pipe. The arm ratio with the arm length T2 from 40 to the tip side of the first arm where the second arm is bent is set to 1 or more (preferably 2 times or more and 5 times or less).

  With this configuration, it is possible to move the pressing guide 44 by enlarging the expansion / contraction displacement amount of the pipe, and it is possible to respond sensitively to the expansion / contraction displacement.

  The arm member 41 is composed of two arm members 41 a and 41 b provided opposite to each other so as to sandwich the arm rib 38 and the tip end of the tie rod 7, and each arm member is rotatable with respect to the arm rib 38. A base end portion 39 pivotally supported on the first arm 111, a first arm 111 extending from the base end portion 39 radially outward of the pipe and having the arm connecting portion 40, and an L shape from the first arm 111 toward the bellows The second arm 112 is bent.

  Further, a transfer plate 42 that penetrates and connects the tips of the respective second arms 112 is provided, and the support rods 43 are loosely fitted on both sides of the transfer plate 42, and the spherical washer 13a (see FIG. 4). The pressure guide 14 is a roller-like member, and both end portions in the axial direction of the roller-like member are attached to the tips of the two support rods 43.

  In addition, the urging means is always attached to the guide flange 4 and the pressing force receiving seat 51 regardless of the movement of the pressing guide 44. This configuration will be described in detail with reference to FIG.

  As shown in FIG. 11A, the thrust ensuring means 110 includes an arm member 41 pivotally connected to an arm rib 38 fixed to the end tube 2, a transfer plate 42 attached to the distal end portion of the arm member 41, A support rod 43 provided so as to penetrate the transfer plate 42 and a roller-shaped pressing guide 44 attached to the free end side of the support rod 43 are provided.

  The insertion hole provided in the pressing guide 44 has a diameter slightly larger than the diameter of the support rod 43, and the pressing guide 44 is slidably attached to the support rod 43. Further, a spring member 45 for urging the pressing guide 44 in the direction of the transfer plate 42 is provided, and the tie rod 7 is disposed between the pressing guide 44 and the transfer plate 42 so that the pressing guide 44 and the pressing force are The pressing guide 44 is provided with a notch 44a that permits contact with the receiving seat 51 but does not allow contact with the tie rod 7.

  Further, the extension member 50 is attached to the tip of the tie rod 7 and the arm member 41 is connected to the extension member. That is, the extension member 50 and the first arm 111 are connected to the pivot connection state by the arm connection part 40. The arm connecting portion 40 may be provided by extending the tip of the tie rod 7 without using the extension member 50. However, by using the extension member 50 whose length can be adjusted, it is appropriate depending on the apparatus size. It becomes possible to adjust the length of the tie rod. In any case, the arm member 41 is pivotable about the arm connecting portion 40 by pivotally connecting the tie rod 7 and the arm member. Further, a pressing force receiving seat 51 is attached to a predetermined position of the tie rod 7 via a fixing member 52.

  As shown in FIG. 11B, the support rod 43 is inserted into the mounting hole 42a having a diameter larger than that of the support rod 43, and the support rod 43 is mounted via the spherical washer 43a and the spherical nut 43b. The support rod 43 can swing with respect to the transfer plate 42. Further, the nuts 43c and 43d form a fixed nut, which can be fixed by setting it within a predetermined swing range.

  The pressing guide 44 mounted on the free end side of the support rod 43 is loosely fitted to the support rod 43 through an insertion hole having a diameter larger than the diameter of the support rod. It is slidable. Further, the spring member 45 attached to the shaft end and the stop nut 45a prevent the support rod 43 from coming off. Further, with the posture in which the free end side of the support rod 43 is moved away from the bellows 1, the pressing guide 44 is brought into contact with the guide flange 4, and the pressing guide 44 is pressed against the guide flange 4 by the biasing force of the spring member 45. The configuration is as follows.

  As described above, since the support rod 43 is attached to the transfer plate 42 via the spherical washer and the spherical nut, the pressing guide 44 can reliably transmit the load by contact with the guide flange 4, The load can be transmitted by the pressing force due to the urging force of the spring member 45 and the pressing force due to the displacement of the link mechanism.

  In order not to apply the load of the internal pressure thrust to the anchor point, it is obvious that the arm length ratio of the link mechanism and the biasing force of the spring member 45 are set within an appropriate range. That is, it is important that the arm ribs 38 be moved within the expansion / contraction range of the spring member 45 even if the arm ribs 38 are moved by expansion / contraction of the piping.

  In this embodiment, as the thrust securing means 110 having the pressing guide 44, as shown in the CC arrow view of FIG. 9, four thrust securing means 110A, 110B, 110C, and 110D are arranged equally on the circumference. Provided. The arm member 41 has two arm members 41a and 41b provided opposite to each other. The arm member 41 is pivotally supported by the arm rib 38 at the base end portion 39, and a transfer plate 42 is provided at the distal end portion. It is provided through.

  Support rods 43a and 43b are mounted on both sides of a transfer plate 42 provided through the arm members 41a and 41b, respectively. And the roller-shaped press guide 44 is mounted | worn with the front-end | tip part of these two support rods 43a and 43b.

  Since the tie rod 7 is located near the center of the roller-shaped pressing guide 44, a notch 44 a for avoiding interference with the tie rod 7 is provided. Further, the contact with the tie rod 7 is not permitted, but the notch 44a having a width enough to permit the contact between the pressing guide 44 and the pressing force receiving seat 51 attached to the tie rod 7 is formed into a roller shape. Even if the pressing guide 44 is close to the tie rod 7, the pressing guide 44 and the tie rod 7 are not in direct contact with each other. Furthermore, by providing the pressing force receiving seat 51 at a predetermined position of the tie rod 7, it becomes possible to have a configuration in which the roller-shaped pressing guide 44 is always in contact. Therefore, when the pipe expands and contracts, the bellows 1 contracts, the guide flange 4 moves, and the link mechanism operates, the pressing guide 44 moves outward in the radial direction of the pipe and presses against the pressing force receiving seat 51. By doing so, a pressing force is applied to the tie rod 7 via the guide flange 4, and the internal pressure thrust can be surely secured.

  The pressing force receiving seat 51 has a rectangular shape corresponding to the outer shape of the roller-shaped pressing guide 44 as indicated by an imaginary line in the figure. However, the shape is not particularly limited, and it may be a large circular seat, and may be configured so as to contact the roller-shaped pressing guide 44 and transmit the force to the tie rod 7.

  Furthermore, the surface that contacts the roller-shaped pressing guide 44 is an inclined surface 51a that engages with the roller-shaped outer periphery, and the opening angle between the inclined surface 51a and the guide flange surface is an acute angle, The surface of the guide flange 4 forms a wedge-shaped guide, and the roller-shaped pressing guide 44 can bite into the structure. With this configuration, the tie rod 7 can reliably secure the internal pressure thrust, the internal pressure thrust is not burdened on the anchor point, and the bellows 1 is not damaged.

  Further, as described above, the spring member 45 that urges the pressing guide 44 in the direction in which the pressing guide 44 is brought into contact with the pressing force receiving seat 51 is provided, and the pressing guide 44 is attached to the support rod 43 with the spherical washer 43a and the spherical nut 43b. Therefore, regardless of the position of the arm rib 38, the pressing guide 44 can always be in contact with the inclined surface 51a and the guide flange 4 surface. With this configuration, the displacement of the end tube 2, that is, the movement of the guide flange 4 is always transmitted to the tie rod 7 via the pressing guide 44, and the tie rod 7 can reliably secure the internal pressure thrust.

  As described above, according to the present invention, the bellows type non-thrust expansion / contraction provided with the thrust securing means 100 that maintains the contact state between the pressing guide member 15 and the pressing force seat member 10 and constantly secures the internal pressure thrust to the tie rod 7. Since the bellows type non-thrust expansion and contraction pipe joint BT2 including the thrust coupling means 110 that maintains the contact state between the pressure guide 44 and the pressure receiving seat 51 and constantly secures the internal pressure thrust to the tie rod 7 is provided. Regardless of the displacement of the guide flange due to expansion and contraction of the pipe, the pressure guide member biased to abut against both the pressing force receiving seat member and the guide flange, regardless of the method, A bellows type non-thrust expansion / contraction pipe joint configured to maintain the contact state between the pressing guide member and the pressing force receiving seat member and to ensure that the internal pressure thrust is always secured to the tie rod. It made.

  For this reason, in any configuration of bellows type non-thrust expansion / contraction pipe joints, the internal pressure thrust is received by the tie rod 7 regardless of the single bellows type, so that an excessive anchor to counter the internal pressure thrust is unnecessary and economical. It can be said that there is. Further, since the internal structure is complicated and there are no protrusions, a large space is not required, and the inner cylinder 30 can be provided, and can be used for a granular material or a slurry fluid.

  Furthermore, since it is a single type, it can also be used in a direction perpendicular to the axis, and a single set of bellows, which is necessary for a plurality of sets in a conventional balanced expansion pipe joint, can be improved. Therefore, the internal structure can be simplified, and a bellows-type thrustless expansion joint that can be used for a granular material or a slurry fluid can be obtained.

It is a schematic explanatory drawing of 1st embodiment of the bellows type non-thrust expansion-contraction pipe joint which concerns on this invention. It is an AA arrow line view of FIG. It is a BB arrow line view of FIG. It is CC arrow line view of FIG. FIG. 4 is a DD arrow view of FIG. 3. It is principal part sectional drawing which shows a modification. It is a principal part enlarged view which shows the fitting structure of an unevenness | corrugation, Comprising: (a) shows the combination of a concave square pressing force receiving seat and a convex pressing guide block, (b) is a convex square pressing force. The combination of a receiving seat and a concave pressing guide block is shown. It is a schematic explanatory drawing of 2nd embodiment of the bellows type non-thrust expansion-contraction pipe joint which concerns on this invention. It is an EE arrow line view of FIG. It is a FF arrow line view of FIG. It is a schematic explanatory drawing of a thrust ensuring means, (a) shows the side view, (b) has shown the principal part enlarged view. It is sectional drawing of the conventional single type bellows expansion-contraction pipe joint. It is a schematic explanatory drawing of the conventional balance type bellows expansion-contraction pipe joint.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bellows 2 End pipe 3 Flange 4 Guide flange 7 Tie rod 10 Pressing force seat member 10A, 10B Rectangular pressing force seat 10a Inclined surface (contact surface)
DESCRIPTION OF SYMBOLS 15 Press guide member 15A, 15B Press guide block 38 Arm rib 41 Arm member 42 Transfer plate 43 Support rod 44 Press guide 51 Pressing force receiving seat 51a Inclined surface (contact surface)
100 Thrust guarantee means (first embodiment)
110 Thrust guarantee means (second embodiment)
BT1 Bellows-type no-thrust expansion joint (first embodiment)
BT2 Bellows type thrustless expansion / contraction pipe joint (second embodiment)

Claims (12)

An expansion pipe joint comprising a plurality of tie rods for connecting guide flanges provided on both sides of a bellows of an end pipe connected to both ends of the bellows by connecting pipes via the bellows,
Both ends of the tie rod are extended through the guide flanges on both sides, a pressing force receiving seat member for fitting the extended portion is provided in the extended portion, and a nut member provided at the distal end portion of the tie rod As we stop,
Between the pressing force receiving seat member and the guide flange, between the pressing force receiving seat member and the end tube, and against both the pressing force receiving seat member and the guide flange. Regardless of the displacement of the guide flange due to expansion and contraction of the piping, the contact state between the pressing guide member and the pressing force receiving seat member is maintained through the pressing guide member biased so as to contact the inner pressure thrust constantly. A bellows-type thrustless expansion and contraction pipe joint, characterized in that it forms a thrust securing means for securing the tie rod. The pressing force receiving seat member has a tie rod insertion hole in the center, and has a contact surface that contacts the pressing guide member on the side facing the end tube, and the contact surface is a guide flange. As an inclined surface inclined in the direction from the surface toward the rising end tube, the opening angle formed by the inclined surface and the guide flange surface is an acute angle,
The pressing guide member is provided with a first abutting portion that abuts on the inclined surface and a second abutting portion that abuts on the guide flange, and the guide flange surface is movable through the second abutting portion. The bellows-type thrustless expansion and contraction pipe joint according to claim 1, wherein a biasing member that biases the first abutting portion in a direction in which the first contact portion is pressed against the inclined surface is disposed.   The pressing force receiving seat member is a rectangular pressing force receiving seat having a rectangular cross section, the pressing guide member is a pressing guide block having a rectangular cross section, and the rib member provided between the flange on the outer peripheral portion of the end tube and the guide flange is the pressing member. The rib member has a pair of left and right guide pieces for guiding both side surface portions of the guide block, and the side surface portion of the abutting portion between the rectangular pressing force receiving seat and the pressing guide block has an uneven fitting configuration. The bellows type non-thrust expansion and contraction pipe joint according to claim 1 or 2, characterized by the above-mentioned.   An urging member mounting portion is provided by providing a step at the upper part of the second abutting portion of the pressing guide block, a cover member is provided to cover both sides of the urging member mounting portion with the guide pieces and further cover the upper portion. The bellows type non-thrust expansion / contraction pipe joint according to claim 3.   A slot or U-shaped groove that allows the insertion of the tie rod regardless of displacement of the pressing guide block is provided in the pressing guide block, and a spherical recess is provided at the top of the rectangular pressing force receiving seat, 5. The nut member is fastened with a spherical washer that matches the spherical recess, so that the rectangular pressure receiving seat can be eccentric with respect to the tie rod. Bellows type thrustless expansion and contraction pipe joint as described.   The bellows-type thrustless expansion / contraction pipe joint according to any one of claims 1 to 5, further comprising a tension member that connects top portions of the tie rods.   7. The pair of jig locking members having jig locking holes are disposed on the rib members so as to face both sides of the biasing member mounting portion. Bellows type thrustless expansion and contraction pipe joint. The pressing guide member is a roller-shaped pressing guide roller, the pressing force receiving seat member is a horizontally long pressing force receiving seat corresponding to the pressing guide roller, and the flange between the outer peripheral portion of the end tube and the guide flange, An arm rib is provided at a predetermined position on the circumference where the tie rod is disposed, the tie rod is extended to the vicinity to reach the arm rib, and
It is attached so as to abut on both the base end portion pivotally supported by the arm rib, the arm connecting portion connected to the tip end portion of the tie rod, and the laterally long pressing force receiving seat attached to the guide flange and the tie rod. An arm member provided with a tip portion supporting the pressed guide roller to be biased,
When the arm rib moves due to expansion and contraction of the pipe, a link mechanism is formed in which the arm member rotates around the arm connecting portion as a rotation center, and a pressing guide roller provided at the tip of the arm member via the link mechanism is provided with the guide flange. 3. A bellows-type non-thrust expansion / contraction pipe joint according to claim 2, wherein said bellows type thrustless expansion / contraction pipe joint is formed so as to abut against said laterally long pressure receiving seat regardless of the amount of displacement, and to constantly secure an internal pressure thrust to a tie rod. . The arm member is composed of a pair of arm members provided to oppose each other so as to sandwich the arm rib and the tip of the tie rod, and each arm member is pivotally supported by the arm rib so as to be pivotally supported. A first arm extending from the base and the base end to the outside in the radial direction of the pipe and having the arm connecting portion, and a second arm bent in an L shape from the distal end side of the first arm toward the bellows And
Providing a connecting plate that penetrates and connects the tip portions of the respective second arms, and attaches support rods to both sides of the connecting plate in a loosely coupled state via a spherical washer;
The bellows-type thrustless expansion and contraction pipe joint according to claim 8, wherein both end portions in the axial direction of the pressing guide roller are attached to the tips of the two support rods.   The pressure guide roller is slidably mounted through an insertion hole having a diameter larger than the diameter of the support rod, and a spring member for urging the pressure guide roller in the direction of the transfer plate is provided, and the pressure guide roller The tie rod is disposed between the pressing plate and the transfer plate, and a notch portion is provided in the pressing guide roller that allows contact between the pressing guide roller and the pressing force receiving seat but does not allow contact with the tie rod. The bellows type no-thrust force expansion joint according to claim 8 or 9.   The bellows-type thrustless expansion / contraction pipe joint according to any one of claims 8 to 10, wherein an extension member is attached to the tip of the tie rod, and the arm member is connected to the extension member.   A link mechanism that increases the arm length from the arm connecting portion to the distal end side of the first arm provided by bending the second arm rather than the arm length from the base end portion to the arm connecting portion. The bellows-type thrustless expansion / contraction pipe joint according to any one of claims 9 to 11, wherein the pressure guide is moved by enlarging the displacement of the arm rib due to expansion and contraction of the pipe.

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