A straight pipe pressure-balanced expansion joint

Abstract

This invention discloses a straight-pipe pressure-balanced expansion joint, relating to the field of pipeline connection technology. It includes an edge corrugated pipe, a central corrugated pipe, and a central ring. Both ends of the central ring are fixedly fitted with central corrugated pipes. A connecting disc is fixedly fitted at the end of each central corrugated pipe away from the central ring. An edge disc is fixedly fitted at the end of each edge corrugated pipe. The edge discs are arranged in a circular array with mating rings, and the connecting discs are arranged in a circular array with mounting rings. A particle extraction component is located at the center of the central ring. The particle extraction component has a first capturing pipe and a second capturing pipe arranged in a horizontal pipe, extending into the vicinity of the corrugated joint gaps of the central and edge corrugated pipes, respectively. Using a drive motor and a vacuum cleaner connected to an external extraction box, coal dust particles in the corrugated joint gaps of the central and edge corrugated pipes can be quickly removed, preventing the long-term accumulation of coal dust particles on the inner wall of the pipe, which would aggravate wear and cause serious problems such as leakage in the expansion joint.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipe connection, in particular to a straight pipe pressure balance type expansion joint. BACKGROUND

[0002] A straight pipe pressure balance type expansion joint is a compensation device used in pipe systems. It is usually made of metal and has a tubular shape. Its main function is to compensate for thermal expansion and contraction caused by temperature changes in the pipe system. When the pipe system is affected by thermal expansion and contraction, the straight pipe expansion joint can absorb the stress and displacement caused by the change in pipe length. Its design principle is based on the pressure change of the medium in the pipe to maintain the pressure balance of the pipe system. The straight pipe expansion joint is usually composed of two metal shells, the inner shell and the outer shell, filled with elastic material such as rubber or metal bellows. When the pipe is affected by thermal expansion and contraction, the elastic material between the inner shell and the outer shell will deform, thereby absorbing the stress caused by the change in pipe length. This design allows the straight pipe expansion joint to maintain the pressure balance of the pipe system while reducing the load on the pipe supports and fixing points.

[0003] The straight pipe pressure balance type expansion joint in the prior art when transmitting high temperature medium, because the high temperature medium such as coal particles flows through the expansion joint, the inner wall of the pipe must be wear-resistant and the coal particles cannot be stored between the corrugations, but the existing straight pipe pressure balance type expansion joint lacks a coal powder suction device, so it cannot completely remove the coal particles from the corrugated joint gap, and the long-term storage of coal particles on the inner wall of the pipe will exacerbate the wear of the inner wall of the pipe, causing the expansion joint to leak and other serious problems. SUMMARY

[0004] The purpose of the present application is to solve the problem of the straight pipe pressure balance type expansion joint in the prior art when transmitting high temperature medium, because the high temperature medium such as coal particles flows through the expansion joint, the inner wall of the pipe must be wear-resistant and the coal particles cannot be stored between the corrugations, but the existing straight pipe pressure balance type expansion joint lacks a coal powder suction device, so it cannot completely remove the coal particles from the corrugated joint gap, and the long-term storage of coal particles on the inner wall of the pipe will exacerbate the wear of the inner wall of the pipe, causing the expansion joint to leak and other serious problems, and a straight pipe pressure balance type expansion joint is proposed.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] The utility model provides a kind of straight pipe pressure balance type expansion joint, including edge bellow, intermediate bellow, intermediate ring, the intermediate ring is fixedly provided with intermediate bellow at both ends, the intermediate bellow is fixedly provided with connecting disc at the end away from intermediate ring, the edge bellow end is fixedly provided with edge disc, the edge disc circular array has docking ring, the connecting disc circular array has mounting ring, the docking ring, mounting ring are provided with the fastening assembly that will make between edge bellow and intermediate bellow stable fixed connection, the inner wall of intermediate ring circular array has three groups of gas supply tank, and the three groups of gas supply tank end are fixedly provided with center tube in common, the center tube is provided with the grain suction assembly that the material particle between edge bellow, intermediate bellow wave is sucked.

[0007] Optionally, the fastening assembly includes a fastening screw, a first bolt, and a second bolt, the head of the fastening screw is fixedly provided with a nut, the mounting ring and the docking ring are one-to-one corresponding in position, and the inner diameters of the mounting ring and the docking ring are the same.

[0008] Optionally, the fastening screw passes through the mounting ring and the docking ring from inside to outside in sequence, the first bolt and the second bolt are screwed into the docking ring on both sides of the fastening screw in sequence, and the gap between the first bolt and the second bolt is equal to the width of the docking ring.

[0009] Optionally, one group of the gas supply tanks extends from the inner wall of the intermediate ring to the outer wall of the intermediate ring, and one group of the gas supply tanks is fixedly provided with a top cover at the top, and the top cover is fixedly provided with a quick connector at the center position of the top.

[0010] Optionally, the grain suction assembly includes a horizontal pipe, a vertical bevel gear, and a horizontal bevel gear, and the horizontal bevel gear is concentrically fixedly arranged at the output end of a driving motor.

[0011] Optionally, the driving motor is fixedly arranged at the bottom of a mounting frame, the mounting frame is fixedly arranged at the bottom of the gas supply tank, and the bottom of the mounting frame is provided with a communication groove.

[0012] Optionally, the center tube is fixedly provided with a sealing cover at both ends, the horizontal pipe is rotatably arranged at the center position of the two sealing covers, the vertical bevel gear is fixedly arranged at the end of the horizontal pipe, and the vertical bevel gear is stably meshed with the horizontal bevel gear.

[0013] Optionally, the horizontal pipe is sequentially and equidistantly provided with a first capture pipe and a second capture pipe in the horizontal direction, the length of the first capture pipe is equal to the radius of the inner cavity of the edge bellow, and the length of the second capture pipe is equal to the radius of the inner cavity of the intermediate bellow.

[0014] Compared with the prior art, the utility model has the following advantages:

[0015] 1. The intermediate ring center position of the application is provided with a particle extraction assembly, the horizontal pipe of the particle extraction assembly is provided with a first capture pipe and a second capture pipe, which respectively extend into the near space of the corrugated section of the intermediate corrugated pipe and the edge corrugated pipe, and the coal powder particles in the space of the corrugated section of the intermediate corrugated pipe and the edge corrugated pipe can be quickly extracted by using the driving motor and the dust collector connected to the air supply tank, so as to avoid the problem that the long-time accumulation of coal powder particles on the inner wall of the pipeline will aggravate the wear of the inner wall of the pipeline and cause serious problems such as leakage of the expansion joint.

[0016] 2. The particle extraction assembly of the application is a horizontal pipe, and the first capture pipe and the second capture pipe are equidistantly arranged on the outer wall of the horizontal pipe, and the horizontal pipe is driven to rotate by the driving motor under the cooperation of the vertical bevel gear and the horizontal bevel gear, the driving motor drives the first capture pipe and the second capture pipe on the horizontal pipe to rotate, and the ends of the first capture pipe and the second capture pipe move along the corrugated section space of the edge corrugated pipe and the intermediate corrugated pipe, so as to facilitate the complete cleaning of the coal powder particles in the corrugated section space of the edge corrugated pipe and the intermediate corrugated pipe. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the application.

[0018] Figure 2 It is a schematic diagram of the local structure of the particle extraction assembly and its connecting piece.

[0019] Figure 3 It is another view of the structure of the application. Figure 2

[0020] Figure 4 It is a schematic diagram of the local structure of the air supply tank and its connecting piece.

[0021] Figure 5 It is another view of the structure of the application. Figure 4

[0022] In the figure: 1, edge disc; 110, butt joint ring; 2, edge corrugated pipe; 3, connecting disc; 31, mounting ring; 4, fastening screw; 41, first bolt; 42, second bolt; 5, intermediate corrugated pipe; 6, intermediate ring; 7, center cylinder; 71, air supply tank; 8, sealing cover; 9, horizontal pipe; 91, first capture pipe; 92, second capture pipe; 10, mounting frame; 100, communication groove; 11, driving motor; 12, horizontal bevel gear; 13, vertical bevel gear; 14, top cover; 15, quick connector. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the application will be described clearly and completely below in combination with the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, not all the embodiments. ​​

[0024] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0025] Referring to Figures 1-5 A straight pipe pressure balance type expansion joint, comprising an edge bellows 2, an intermediate bellows 5, an intermediate ring 6, the intermediate bellows 5 is fixedly arranged at both ends of the intermediate ring 6, the intermediate bellows 5 is fixedly arranged with a connecting disc 3 at one end away from the intermediate ring 6, the edge bellows 2 is fixedly arranged with an edge disc 1 at the end, the edge disc 1 is circularly arranged with a butt joint ring 110, the connecting disc 3 is circularly arranged with a mounting ring 31, the butt joint ring 110 and the mounting ring 31 are arranged with a fastening assembly for stably and fixedly connecting the edge bellows 2 and the intermediate bellows 5.

[0026] The fastening assembly comprises a fastening screw 4, a first bolt 41 and a second bolt 42, the head of the fastening screw 4 is fixedly arranged with a nut, the mounting ring 31 and the butt joint ring 110 are one-to-one corresponding in position, the inner diameters of the mounting ring 31 and the butt joint ring 110 are the same, the fastening screw 4 passes through the inside of the mounting ring 31 and the butt joint ring 110 in sequence, the first bolt 41 and the second bolt 42 are screwed into the two sides of the butt joint ring 110 in sequence, and the head of the fastening screw 4 is integrally fixedly arranged on the butt joint ring 110.

[0027] The gap between the first bolt 41 and the second bolt 42 is equal to the width of the butt joint ring 110, due to the existence of the fastening assembly, the edge bellows 2 can compensate the deformation of the working pipe connected to the expansion joint in the axial direction, and the intermediate bellows 5 is provided with two groups, and the setting of the intermediate bellows 5 compensates the deformation of the working pipe connected to the expansion joint in the non-axial direction.

[0028] The inner wall of the intermediate ring 6 is circularly arranged with three groups of gas supply tanks 71, the three groups of gas supply tanks 71 are fixedly arranged with a center cylinder 7 at the end, one group of gas supply tanks 71 extends from the inner wall of the intermediate ring 6 to the outer wall of the intermediate ring 6, one group of gas supply tanks 71 is fixedly arranged with a top cover 14 at the top, and the top cover 14 is fixedly arranged with a quick connector 15 at the top center position, which is used for external connection of a dust collector.

[0029] The center tube 7 is internally provided with a particle suction assembly for sucking the material particles between the edge bellows 2 and the middle bellows 5, which comprises a horizontal pipe 9, a vertical bevel gear 13 and a horizontal bevel gear 12.

[0030] The mounting frame 10 is fixedly arranged at the bottom of the air supply tank 71, and the bottom of the mounting frame 10 is provided with a communication groove 100. The center tube 7 is fixedly arranged with two sealing covers 8 at both ends, and the horizontal pipe 9 is rotatably arranged at the center position of each of the two sealing covers 8. The horizontal pipe 9 is fixedly arranged with the vertical bevel gear 13 at the end, and the vertical bevel gear 13 is stably meshed with the horizontal bevel gear 12.

[0031] The horizontal pipe 9 is sequentially and equidistantly provided with a first capturing pipe 91 and a second capturing pipe 92 in the horizontal direction. The length of the first capturing pipe 91 is equal to the radius of the inner cavity of the edge bellows 2, and the length of the second capturing pipe 92 is equal to the radius of the inner cavity of the middle bellows 5.

[0032] The specific implementation steps and principles of the present application are as follows:

[0033] When it is necessary to simultaneously remove the coal powder particles in the edge bellows 2 and the middle bellows 5, the quick connector 15 is connected to the dust collector, and the driving motor 11 is started. On the one hand, the driving motor 11 drives the two groups of horizontal pipes 9 to start rotating through the horizontal bevel gear 12 and the vertical bevel gear 13. Since the end of the horizontal pipe 9 close to the vertical bevel gear 13 is an open end, the driving motor 11 drives the first capturing pipe 91 and the second capturing pipe 92 on the horizontal pipe 9 to rotate, and the ends of the first capturing pipe 91 and the second capturing pipe 92 move along the clearance of the circumferential bellows of the edge bellows 2 and the middle bellows 5. The dust collector sucks out the coal powder particles in the clearance of the circumferential bellows of the edge bellows 2 and the middle bellows 5 through the air supply tank 71, the communication groove 100 of the mounting frame 10, the horizontal pipe 9, the first capturing pipe 91 and the second capturing pipe 92.

[0034] The above is only the preferred specific implementation method of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacement or change according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A straight pipe pressure balanced expansion joint comprising an edge bellow (2), an intermediate bellow (5), an intermediate ring (6), characterized in that, The intermediate ring (6) is fixedly provided with an intermediate bellow (5) at both ends, the intermediate bellow (5) is fixedly provided with a connecting disc (3) at one end away from the intermediate ring (6), the edge bellow (2) is fixedly provided with an edge disc (1) at the end, the edge disc (1) is circularly arrayed with a docking ring (110), the connecting disc (3) is circularly arrayed with a mounting ring (31), the docking ring (110) and the mounting ring (31) are provided with a fastening assembly for stably and fixedly connecting the edge bellow (2) and the intermediate bellow (5), the inner wall of the intermediate ring (6) is circularly arrayed with three groups of gas supply boxes (71), the three groups of gas supply boxes (71) are fixedly provided with a center cylinder (7) at the end, the center cylinder (7) is internally provided with a particle suction assembly for sucking the material particles between the edge bellow (2) and the intermediate bellow (5), one group of the gas supply boxes (71) extends out of the intermediate ring (6) from the inside of the intermediate ring (6), one group of the gas supply boxes (71) is fixedly provided with a top cover (14) at the top, and the top cover (14) is fixedly provided with a quick connector (15) at the top center position.

2. A straight pipe pressure balanced expansion joint according to claim 1, characterized in that, The fastening assembly comprises a fastening screw (4), a first bolt (41) and a second bolt (42), the head of the fastening screw (4) is fixedly provided with a nut, the mounting ring (31) and the docking ring (110) are one-to-one corresponding in position, and the inner diameters of the mounting ring (31) and the docking ring (110) are the same.

3. A straight pipe pressure balanced expansion joint according to claim 2, characterized in that, The fastening screw (4) sequentially penetrates the inside of the mounting ring (31) and the docking ring (110), the first bolt (41) and the second bolt (42) are screwed into the docking ring (110) on both sides of the fastening screw (4) in sequence, and the gap between the first bolt (41) and the second bolt (42) is equal to the width of the docking ring (110).

4. A straight pipe pressure balanced expansion joint as claimed in claim 1, wherein, The particle suction assembly comprises a horizontal pipe (9), a vertical bevel gear (13) and a horizontal bevel gear (12), and the horizontal bevel gear (12) is concentrically and fixedly arranged at the output end of a driving motor (11).

5. A straight tube pressure balanced expansion joint as claimed in claim 4, wherein, The driving motor (11) is fixedly arranged at the bottom of a mounting frame (10) at the top, the mounting frame (10) is fixedly arranged at the bottom of the gas supply box (71), and the bottom of the mounting frame (10) is provided with a communication groove (100).

6. A straight tube pressure balanced expansion joint as claimed in claim 5, wherein, The center cylinder (7) is fixedly provided with a sealing cover (8) at both ends, the horizontal pipe (9) is rotatably arranged at the center position of the two sealing covers (8), the horizontal pipe (9) is fixedly provided with a vertical bevel gear (13) at the end, and the vertical bevel gear (13) is stably engaged with the horizontal bevel gear (12).

7. A straight tube pressure balanced expansion joint as claimed in claim 6, wherein, The horizontal pipe (9) is sequentially and equidistantly provided with a first capture pipe (91) and a second capture pipe (92) in the horizontal direction, the length of the first capture pipe (91) is equal to the radius of the inner cavity of the edge bellow (2), and the length of the second capture pipe (92) is equal to the radius of the inner cavity of the intermediate bellow (5).

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