Rotary pipeline expansion joint mechanism

Abstract

The invention relates to the technical field of expansion joint mechanism application, in particular to a rotary pipeline expansion joint mechanism which comprises an expansion joint body, lantern ring sets are arranged at the two ends of the expansion joint body, each lantern ring set is composed of an outer ring, a middle ring and an inner ring, and the middle rings are rotationally connected between the outer rings and the inner rings through sealing bearings; the inner ring is integrally and fixedly connected to the two ends of the expansion joint body, the outer ring and the inner ring are fixedly connected through a plurality of connecting frames, a plurality of connecting lugs are fixedly connected to the periphery of the edge of the outer ring at equal intervals, and a bolt rod is arranged between every two connecting lugs correspondingly distributed at the two ends of the expansion joint body. According to the rotary expansion joint, the service life of the rotary expansion joint body can be remarkably prolonged through radial supporting, axial balance stress and separation of the sealing rings, the overall strength of the rotary expansion joint body can be improved through matching of the radial supporting and the axial balance stress, and use is better guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of telescopic joint mechanism applications, and in particular to a rotary pipeline telescopic joint mechanism. Background Art

[0002] The rotary pipe expansion joint is a device used to absorb axial, radial and angular displacements caused by temperature changes, mechanical vibrations or other external factors in the piping system. This expansion joint is particularly suitable for piping systems that require large rotation angles and displacements, such as thermal power plants, chemical plants, oil refineries, etc.

[0003] The support strength and sealing performance of the rotary pipe expansion joint are very important. Appropriate support needs to be provided during rotation to ensure its stability and reliability. At the same time, good sealing performance can not only prevent external contaminants from entering the expansion joint, but also prevent internal lubricant leakage, thereby ensuring the normal operation and service life of the expansion joint.

[0004] The existing rotary pipe expansion joint relies on its own material properties to expand and contract, and the materials transported in the rotary pipe expansion joint will also be different. When transporting some materials with higher viscosity, the force inside the rotary pipe expansion joint is often uneven due to different flow resistance. It is often the case that some areas inside the expansion joint are heavily loaded and some areas are lightly loaded. This will cause the rotary pipe expansion joint to have a large deformation amplitude and be prone to damage. In addition, the existing rotary pipe expansion joint only has axial deformation restrictions, but not radial deformation restrictions, and its performance strength is insufficient. At the same time, since the rotary pipe expansion joint needs to have a rotation function, for sealing, the rotation will cause wear of the two contact sealing rings, which is not conducive to ensuring the sealing effect of the sealing rings. Summary of the Invention

[0005] Technical problem to be solved: The present invention provides a rotary pipe expansion joint mechanism that can solve the above-mentioned problems.

[0006] Technical solution: In order to achieve the above-mentioned purpose, the present invention adopts the following technical solution: a rotary pipeline expansion joint mechanism, including an expansion joint body, wherein a ring group is provided at both ends of the expansion joint body, the ring group is composed of an outer ring, a middle ring and an inner ring, the middle ring is rotatably connected between the outer ring and the inner ring through a sealing bearing, the inner ring is integrally fixedly connected to the two ends of the expansion joint body, the outer ring and the inner ring are fixedly connected by a number of connecting frames distributed equidistantly around the circumference, and a number of connecting ears are fixedly connected to the edge of the outer ring at equidistant circumference, a bolt rod is provided between two connecting ears correspondingly distributed at both ends of the expansion joint body, and threaded sections are provided at both ends of the bolt rod, and a connecting nut is provided on both sides of each connecting ear, and the connecting nuts on both sides of the same connecting ear are threadedly connected to the same bolt rod.

[0007] A radial support assembly for radially supporting the telescopic joint body is provided on each bolt rod, and an external tube is provided on the outside of the collar groups on both sides. The end of the external tube in contact with the collar group is integrally fixedly connected with a pipe flange, and the middle ring is fixedly connected to the pipe flange by a number of connecting nuts and connecting bolts.

[0008] A sealing groove is provided between the inner ring and the pipe flange. The sealing groove of the inner ring is filled with a second sealing ring, and the sealing groove of the pipe flange is filled with a first sealing ring. A separation component is provided on the second sealing ring for separating it from the first sealing ring.

[0009] As a preferred technical solution of the present invention, the radial support assembly includes several pressing frames that fit into the grooves of the telescopic joint body. The outer center of each pressing frame is fixedly connected to a support rod, and the end of the support rod away from the telescopic joint body is fixedly connected to a connecting ring. The connecting ring is slidably connected to the bolt rod. A plurality of slip rings are slidingly sleeved on the bolt rod. The connecting ring is located between two adjacent slip rings. A spring is provided between the slip ring and the adjacent connecting ring. A set of springs is provided on the bolt rod. The slip rings on the same bolt rod are commonly provided with a distance adjustment component for adjusting the distance between two adjacent pressing frames.

[0010] As a preferred technical solution of the present invention, the distance adjusting component includes a slip ring 2 which is integrally fixedly connected to the slip ring 1. Except for the slip ring 2 at one end, the remaining slip rings 2 are slidably connected to the same slide rod. A spring 2 is provided between two adjacent slip rings 2, and the spring 2 is sleeved on the slide rod.

[0011] As a preferred technical solution of the present invention, a locking bolt 1 is threadedly connected to a slip ring 1 at one end of the bolt rod, and a locking bolt 2 is threadedly connected to a slip ring 2 at the end of the slide rod 1 away from the locking bolt 1.

[0012] As an optimal technical solution of the present invention, the separation component includes a pull ring slidingly connected to the inner ring sealing groove, and a plurality of guide blocks are integrally fixedly connected to the outer edge of the pull ring at equidistant intervals. A guide groove is opened on the middle ring sealing groove corresponding to each guide block, and the guide block is slidably connected in the guide groove, and the pull ring is fixedly connected to the sealing ring 2 through a plurality of connecting pins, and the side of the pull ring away from the sealing ring 2 is integrally fixedly connected to a plurality of arc-shaped miter blocks at equidistant intervals. The miter block is provided with an oblique groove parallel to its oblique surface, and a pull rod extending toward the direction of the telescopic joint body is slidably and limit-connected through a ball head in the oblique groove, and the end of the pull rod away from the miter block is fixedly connected to a connecting rod extending toward the direction of the telescopic joint body, and the outer ends of the connecting rods are fixedly connected to an outer connecting ring, and the inner ends of the connecting rods are fixedly connected to an inner connecting ring, and the inner connecting ring is rotatably connected in the inner ring sealing groove, and a movable groove for the connecting rod to rotate around the central axis of the telescopic joint body is opened on the tube wall of the telescopic joint body corresponding to the position of each connecting rod.

[0013] As a preferred technical solution of the present invention, the contact surfaces of the sealing ring 1 and the sealing ring 2 are both serrated, and the contact surfaces are inclined surfaces.

[0014] Beneficial effects:

[0015] 1. The radial support assembly adopted in the present invention can adaptively balance the force of axial expansion and contraction of the telescopic joint body through the adaptive action of spring 1 and spring 2, ensure that the deformation degree of each section of the telescopic joint body is consistent, effectively avoid the occurrence of local force concentration and deformation overload, and radially support the telescopic joint body through the support rod and the pressing frame, effectively improving the radial strength of the telescopic joint body.

[0016] 2. The separation component used in the present invention can effectively separate and tighten the two contacting sealing rings. In the tightened state, the sealing effect of the sealing ring can be guaranteed. In the separated state, the friction caused by the rotation of the expansion joint body and the external tube can be avoided, effectively extending the service life of the sealing ring.

[0017] 3. The radial support assembly and separation assembly adopted in the present invention are used in combination, which can significantly improve the service life of the rotary telescopic joint body through radial support, axial balanced force and separation sealing ring. The overall strength of the rotary telescopic joint body can be improved through radial support and axial balanced force, making it more secure to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and examples.

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0020] Figure 2 It is a schematic diagram of the cross-sectional three-dimensional structure of the end position of the expansion joint body of the present invention.

[0021] Figure 3 It is a schematic diagram of the three-dimensional structure of the radial support assembly of the present invention.

[0022] Figure 4 It is a schematic diagram of the cross-sectional structure of the connection between the external tube and the expansion joint body of the present invention.

[0023] Figure 5 It is a schematic diagram of the cross-sectional three-dimensional structure of the separation component of the present invention.

[0024] Figure 6 It is a schematic cross-sectional view of the connection structure of the miter block and the pull rod of the present invention.

[0025] Figure 7 It is attached Figure 4 A magnified schematic diagram of area A in the middle.

[0026] In the figure: 1. External tube; 2. Telescopic joint body; 3. Radial support assembly; 31. Press frame; 32. Support rod; 33. Locking bolt 1; 34. Spring 1; 35. Connecting ring; 36. Slip ring 1; 37. Pitch adjustment component; 371. Slip ring 2; 372. Spring 2; 373. Slide rod; 374. Locking bolt 2; 4. Bolt rod; 41. Connecting nut 1; 5. Ring assembly; 51. Connecting ear; 6. Pipe flange; 7. Connecting nut 2; 8. Connecting bolt; 9. Middle ring; 10. Connecting frame; 11. Sealing ring 1; 12. Sealing ring 2; 13. Separation assembly; 131. Guide block; 132. Guide groove; 133. External connecting ring; 134. Connecting rod; 135. Movable groove; 136. Pull rod; 137. Internal connecting ring; 138. Miter block; 139. Pull ring. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered by the claims.

[0028] See Figure 1 and Figure 2 A rotary pipeline expansion joint mechanism includes an expansion joint body 2, and ring groups 5 are provided at both ends of the expansion joint body 2. The ring group 5 consists of an outer ring, a middle ring 9 and an inner ring. The middle ring 9 is rotatably connected between the outer ring and the inner ring through a sealed bearing. The inner ring is integrally fixedly connected to the two ends of the expansion joint body 2. The outer ring and the inner ring are fixedly connected by a number of connecting frames 10 that are equidistantly distributed around the circumference. A number of connecting ears 51 are fixedly connected to the edge of the outer ring at equidistant intervals around the circumference. A bolt rod 4 is provided between the two connecting ears 51 correspondingly distributed at both ends of the expansion joint body 2. Threaded sections are provided at both ends of the bolt rod 4. A connecting nut 41 is provided on both sides of each connecting ear 51. The connecting nuts 41 on both sides of the same connecting ear 51 are threadedly connected to the same bolt rod 4.

[0029] See Figure 1 A radial support assembly 3 for radially supporting the telescopic joint body 2 is provided on each of the bolt rods 4, and an external tube 1 is provided on the outside of the collar groups 5 on both sides. The end of the external tube 1 in contact with the collar group 5 is integrally fixedly connected with a pipe flange 6, and the middle ring 9 is fixedly connected to the pipe flange 6 by a number of connecting nuts 7 and connecting bolts 8.

[0030] See Figure 4 A sealing groove is provided between the inner ring and the pipe flange 6, the sealing groove of the inner ring is filled with a sealing ring 2 12, the sealing groove of the pipe flange 6 is filled with a sealing ring 11, and a separation component 13 is provided on the sealing ring 2 12 for separating it from the sealing ring 11.

[0031] See Figure 1 and Figure 3The radial support assembly 3 includes several pressing frames 31 that fit into the grooves of the telescopic joint body 2. The outer center of each pressing frame 31 is fixedly connected to a support rod 32. The end of the support rod 32 away from the telescopic joint body 2 is fixedly connected to a connecting ring 35. The connecting ring 35 is slidably connected to the bolt rod 4. A plurality of slip rings 36 are slidably sleeved on the bolt rod 4. The connecting ring 35 is located between two adjacent slip rings 36. A spring 34 is provided between the slip ring 36 and the adjacent connecting ring 35. The spring 34 is sleeved on the bolt rod 4. The slip ring 36 on the same bolt rod 4 is commonly provided with a distance adjustment component 37 for adjusting the distance between two adjacent pressing frames 31.

[0032] During specific operation, through the interaction of each spring 34, when the telescopic section body 2 undergoes axial expansion and contraction, the telescopic section body 2 is axially expanded and contracted and balanced, so that the external force is shared by each groove segment of the telescopic section body 2, effectively ensuring the service life of the telescopic section body 2. Through the tightening action of the support rod 32 and the pressing frame 31, the telescopic section body 2 is radially supported to ensure the radial deformation strength of the telescopic section body 2.

[0033] See Figure 3 The distance adjustment component 37 includes a second slip ring 371 integrally fixedly connected to the first slip ring 36. Except for the second slip ring 371 at one end, the remaining second slip rings 371 are slidably connected to the same slide rod 373. A second spring 372 is provided between two adjacent second slip rings 371, and the second spring 372 is sleeved on the slide rod 373.

[0034] During specific operation, through the interaction of the spring 2 372, the sliding rings 371 are adaptively equidistant from each other, ensuring that the stress states of all the springs 1 34 on the entire bolt rod 4 are consistent, further being able to secondary distribute the external force and improve the force balancing effect of the telescopic joint body 2.

[0035] See Figure 3 The locking bolt 33 is threadedly connected to the slip ring 1 36 at the end position of one side of the bolt rod 4, and the locking bolt 2 374 is threadedly connected to the slip ring 2 371 at the end position of the side of the slide rod 1 373 away from the locking bolt 1 33.

[0036] During specific operation, the length of the radial support assembly 3 is limited by using the locking bolt 1 33 and the locking bolt 2 374 together, so that the radial support assembly 3 can adapt to the length of the telescopic joint body 2, ensuring the adaptive force balance of the spring 1 34 and the spring 2 372.

[0037] See Figure 4 、 Figure 6 and Figure 7The separation component 13 includes a pull ring 139 that is slidably connected to the inner ring sealing groove. A plurality of guide blocks 131 are fixedly connected to the outer edge of the pull ring 139 at equal intervals. A guide groove 132 is provided on the sealing groove of the middle ring 9 corresponding to each guide block 131. The guide block 131 is slidably connected in the guide groove 132. The pull ring 139 is fixedly connected to the sealing ring 2 12 through a plurality of connecting pins. A plurality of arc-shaped miter blocks 138 are fixedly connected to the side of the pull ring 139 away from the sealing ring 2 12 at equal intervals. The miter block 138 is provided with an oblique groove parallel to its oblique surface. A pull rod 136 extending in the direction of the telescopic joint body 2 is connected in a limited manner through a ball head sliding in the inclined groove. One end of the pull rod 136 away from the miter block 138 is fixedly connected to a connecting rod 134 extending in the direction of the telescopic joint body 2. The outer ends of the connecting rods 134 are commonly fixedly connected to an outer connecting ring 133, and the inner ends of the connecting rods 134 are commonly fixedly connected to an inner connecting ring 137. The inner connecting ring 137 is rotatably connected to the inner ring sealing groove. A movable groove 135 for rotating the connecting rod 134 around the central axis of the telescopic joint body 2 is provided on the tube wall of the telescopic joint body 2 at a position corresponding to each connecting rod 134.

[0038] During specific operation, the external ring 133 is manually rotated to drive the connecting rod 134 to control the rotation of the pull rod 136, and the pull rod 136 controls the pull ring 139 through the inclined groove to pull the sealing ring 2 12, so as to achieve the separation effect of the sealing ring 11 and the sealing ring 2 12, and can make the sealing ring 11 and the sealing ring 2 12 have no contact when the telescopic joint body 2 and the external tube 1 rotate, avoiding the wear of the sealing ring 11 and the sealing ring 2 12 caused by the rotation, and improving the service life of the sealing ring 11 and the sealing ring 2 12.

[0039] See Figure 4 The contact surfaces of the sealing ring 11 and the sealing ring 2 12 are both serrated, and the contact surfaces are inclined.

[0040] In specific operation, setting a serrated contact surface can increase the contact area and improve the sealing effect, and setting an inclined surface can further increase the contact area.

[0041] When using:

[0042] S1: Through the interaction of each spring 1 34, when the telescopic section body 2 undergoes axial expansion and contraction, the telescopic section body 2 is axially expanded and contracted and balanced, so that the external force is shared by each groove segment of the telescopic section body 2. Through the tightening action of the support rod 32 and the pressing frame 31, the telescopic section body 2 is radially supported. Through the interaction of the spring 2 372, the sliding rings are adaptively equidistant, so that the force state of all the springs 1 34 on the entire bolt rod 4 is consistent, further sharing the external force for a second time.

[0043] S2: By using the locking bolt 1 33 and the locking bolt 2 374 in conjunction with each other, the length of the radial support assembly 3 is limited so that the radial support assembly 3 can adapt to the length of the telescopic joint body 2.

[0044] S3: When the telescopic joint body 2 and the external tube 1 are rotated, the connecting rod 134 is driven by manually rotating the external ring 133 to control the rotation of the pull rod 136. The pull rod 136 controls the pull ring 139 through the inclined groove to pull the sealing ring 2 12, thereby separating the sealing ring 11 and the sealing ring 2 12.

[0045] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A rotary pipe expansion joint mechanism, comprising an expansion joint body, characterized in that: A collar group is provided at both ends of the telescopic joint body, and the collar group consists of an outer ring, a middle ring and an inner ring. The middle ring is rotatably connected between the outer ring and the inner ring through a sealed bearing, and the inner ring is integrally fixedly connected to the two ends of the telescopic joint body. The outer ring and the inner ring are fixedly connected by a number of connecting frames equidistantly distributed around the circumference. A number of connecting ears are fixedly connected to the edge of the outer ring equidistantly around the circumference. A bolt rod is provided between two corresponding connecting ears at both ends of the telescopic joint body, and threaded sections are provided at both ends of the bolt rod. A connecting nut is provided on both sides of each connecting ear, and the connecting nuts on both sides of the same connecting ear are threadedly connected to the same bolt rod. Each bolt rod is provided with a radial support assembly for radially supporting the expansion joint body. External tubes are provided on the outside of the collar groups on both sides. The ends of the external tubes that contact the collar group are integrally fixedly connected with pipe flanges. The middle ring is fixedly connected to the pipe flanges by a number of connecting nuts and connecting bolts. A sealing groove is provided between the inner ring and the pipe flange. The sealing groove of the inner ring is filled with a second sealing ring, and the sealing groove of the pipe flange is filled with a first sealing ring. A separation component is provided on the second sealing ring for separating it from the first sealing ring.

2. The rotary pipe expansion joint mechanism according to claim 1, characterized in that: The radial support assembly includes several pressing frames that fit into the grooves of the telescopic joint body. The outer center of each pressing frame is fixedly connected to a support rod. The end of the support rod away from the telescopic joint body is fixedly connected to a connecting ring. The connecting ring is slidably connected to the bolt rod. A plurality of slip rings are slidingly sleeved on the bolt rod. The connecting ring is located between two adjacent slip rings. A spring is provided between the slip ring and the adjacent connecting ring. A set of springs is provided on the bolt rod. The slip rings on the same bolt rod are commonly provided with a distance adjustment component for adjusting the distance between two adjacent pressing frames.

3. The rotary pipe expansion joint mechanism according to claim 2, characterized in that: The distance adjustment component includes a slip ring 2 which is integrally fixedly connected to the slip ring 1. Except for the slip ring 2 at one end, the remaining slip rings 2 are slidably connected to the same slide rod. A spring 2 is provided between two adjacent slip rings 2, and the spring 2 is sleeved on the slide rod.

4. The rotary pipe expansion joint mechanism according to claim 3, characterized in that: A locking bolt 1 is threadedly connected to a slip ring 1 at one end of the bolt rod, and a locking bolt 2 is threadedly connected to a slip ring 2 at the end of the slide rod 1 away from the locking bolt 1.

5. The rotary pipe expansion joint mechanism according to claim 1, characterized in that: The separation component includes a pull ring that is slidably connected to the inner ring sealing groove, and a plurality of guide blocks are integrally fixedly connected to the outer edge of the pull ring at equal distances around the circumference. A guide groove is provided on the middle ring sealing groove corresponding to each guide block. The guide block is slidably connected to the guide groove, and the pull ring is fixedly connected to the sealing ring 2 through a plurality of connecting pins. The pull ring is away from the sealing ring 2 and is integrally fixedly connected to a plurality of arc-shaped miter blocks at equal distances around the circumference. The miter block is provided with an oblique groove parallel to its oblique surface, and a pull rod extending in the direction of the telescopic joint body is slidably and limit-connected through a ball head in the oblique groove. The end of the pull rod away from the miter block is fixedly connected to a connecting rod extending in the direction of the telescopic joint body. The outer ends of the connecting rods are fixedly connected to an outer connecting ring, and the inner ends of the connecting rods are fixedly connected to an inner connecting ring. The inner connecting ring is rotatably connected to the inner ring sealing groove, and a movable groove for rotating the connecting rod around the central axis of the telescopic joint body is provided on the tube wall of the telescopic joint body corresponding to the position of each connecting rod.

6. The rotary pipe expansion joint mechanism according to claim 5, characterized in that: The contact surfaces of the sealing ring 1 and the sealing ring 2 are both sawtooth-shaped, and the contact surfaces are inclined surfaces.

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