High-pressure centrifugal compressor

Abstract

The invention relates to the field of centrifugal compressors, in particular to a high-pressure centrifugal compressor which comprises a high-pressure centrifugal compressor body, an air inlet pipe and an exhaust pipe are arranged on the high-pressure centrifugal compressor body, the exhaust pipe is connected with an external pipeline through a connecting mechanism, and a detection mechanism is arranged between the exhaust pipe and the external pipeline in a covering mode. Through the synergistic effect of a tensioning assembly (meshing transmission of a gear ring and a gear) of the connecting mechanism and a spring energy storage structure, rapid fastening sealing of the exhaust pipe and an external pipeline can be achieved only by rotating an operation ring, compared with traditional flange connection, bolts do not need to be operated one by one, the assembling efficiency is remarkably improved, meanwhile, a first spring provides continuous axial pressing force, and the assembling efficiency is improved. A connecting gap caused by vibration or temperature change can be dynamically compensated, it is ensured that the sealing ring is in a tight fit state all the time, and the air leakage risk is effectively avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of centrifugal compressors, and particularly to a high-pressure centrifugal compressor. Background Art

[0002] As a key device for gas boosting and transportation, a high-pressure centrifugal compressor converts the mechanical energy of the prime mover into the pressure energy and kinetic energy of the gas through the high-speed rotation of the impeller. Heat exchangers are usually provided on each stage of the compression unit of the high-pressure centrifugal compressor for waste heat recovery to achieve efficient compression and transportation of the gas.

[0003] Currently, in the actual use of compressors, the connection between the exhaust end and the external pipeline is an important link. Traditional connection methods usually adopt structures such as flange connections. This connection method is not only very troublesome and has low connection efficiency, but also, during long-term operation, due to the influence of factors such as vibration and pressure fluctuations, the connection is prone to looseness, resulting in a decrease in airtightness and gas leakage. Gas leakage not only causes waste of energy, affects production efficiency, but also may pose safety hazards.

[0004] Therefore, the present invention provides a high-pressure centrifugal compressor to solve the above problems. Summary of the Invention

[0005] In view of the above situation, in order to overcome the deficiencies of the prior art, the present invention provides a high-pressure centrifugal compressor to solve the problems that the connection at the exhaust end of the existing compressor is prone to looseness and it is usually impossible to normally detect air leakage at the exhaust end in case of power failure or power outage.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows: A high-pressure centrifugal compressor includes a high-pressure centrifugal compressor body. An air inlet pipe and an exhaust pipe are provided on the high-pressure centrifugal compressor body. The exhaust pipe and the external pipeline are connected by a connection mechanism, and a detection mechanism is covered between the exhaust pipe and the external pipeline; The connection mechanism includes a first ring and a second ring. The first ring is fixedly connected to the outer surface of the exhaust pipe, and the second ring is fixedly connected to the outer surface of the external pipeline. Seals that are tightly attached to each other are installed on the mutually approaching surfaces of the first ring and the second ring, and the two seals are respectively tightly attached to the mutually approaching ends of the exhaust pipe and the external pipeline. Four tension shafts are slidably installed inside the first ring. One end of the tension shaft is fixedly connected to a tension plate. A long strip hole for the tension plate to pass through is opened inside the second ring, and a circular groove is opened inside the first ring, and a rotary tensioning assembly is arranged inside the circular groove.

[0007] Preferably, the rotary tensioning assembly includes a toothed ring and four gears, and the toothed ring and the four gears are rotatably installed inside the circular groove. The gears are key-connected to the pull shaft, and all four gears are engaged with the toothed ring.

[0008] Preferably, an operation ring is sleeved outside the exhaust pipe, and one ends of the four pull shafts away from the pull plate are all slidably connected inside the operation ring.

[0009] Preferably, an arc-shaped block is fixedly connected inside the circular groove. A T-shaped groove is formed inside the arc-shaped block. A T-shaped block is slidably connected inside the T-shaped groove. A connecting rod is fixedly connected to the T-shaped block, and the other end of the connecting rod is fixedly connected to the operation ring.

[0010] Preferably, a rectangular groove for the T-shaped block to slide up and down is formed inside the arc-shaped block, and the rectangular groove communicates with the end of the T-shaped groove.

[0011] Preferably, a cylinder is fixedly connected to the side of the toothed ring close to the operation ring. A first spring is fixedly connected inside the cylinder. The other end of the first spring is fixedly connected to a round rod, and the other end of the round rod slidably penetrates through the cylinder and is fixedly connected to the operation ring.

[0012] Preferably, the detection mechanism includes a first semi-cylindrical cover and a second semi-cylindrical cover. The first semi-cylindrical cover and the second semi-cylindrical cover cover the connection between the exhaust pipe and the external pipe, and the sides of the first semi-cylindrical cover and the second semi-cylindrical cover close to each other are fixedly connected. A detection cylinder is fixedly communicated with the outer surface of the first semi-cylindrical cover. A prompt cylinder is fixedly communicated with the top of the detection cylinder, and first sliding grooves are formed inside both the detection cylinder and the prompt cylinder. The two first sliding grooves are concentric and communicated.

[0013] Preferably, a first sliding plate is slidably connected inside the first sliding groove. A counterweight block is integrally formed on the first sliding plate. A prompt rod is fixedly connected to the upper surface of the first sliding plate. A round hole for the prompt rod to pass through is formed at the top of the prompt cylinder.

[0014] Preferably, an exhaust cylinder is fixedly connected to the outer surface of the second semi-cylindrical cover. Second sliding grooves are formed inside both the exhaust cylinder and the second semi-cylindrical cover. The two second sliding grooves are concentric and communicated. A second sliding plate is slidably connected inside the second sliding groove. A second spring is fixedly connected to the side of the second sliding plate close to the exhaust cylinder, and the other end of the second spring is fixedly connected to the inner wall of the exhaust cylinder.

[0015] Preferably, a vent hole is formed inside the exhaust cylinder.

[0016] The beneficial effects of the present invention are as follows: 1. Through the combined action of the tensioning component of the connecting mechanism (meshing drive between the toothed ring and the gear) and the spring energy storage structure of the present invention, only by rotating the operating ring can the rapid fastening and sealing of the exhaust pipe and the external pipe be achieved. Compared with the traditional flange connection, there is no need to operate the bolts one by one, which significantly improves the assembly efficiency. At the same time, the first spring provides a continuous axial pressing force, which can dynamically compensate for the connection gap caused by vibration or temperature changes, ensuring that the sealing ring is always in a tightly fitting state and effectively avoiding the risk of air leakage.

[0017] 2. By setting up a detection mechanism in the present invention, when leakage occurs at the connection, the leaked gas pushes the counterweight block to drive the prompt rod to rise and extend out of the prompt cylinder, giving a real-time warning in a visual way (such as a colored prompt rod), solving the problem of the failure of traditional electrical detection components in a power-off environment. In addition, the pressure relief structure composed of the exhaust cylinder and the second spring can automatically open the air vent when the system pressure rises abnormally, preventing the risk of explosion caused by overpressure and further improving the safety of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the cross-sectional view of the detection mechanism of the present invention; Figure 3 is the schematic diagram of the first ring, the second ring and the connecting mechanism of the present invention; Figure 4 is the connection schematic diagram of the toothed ring and the gear of the present invention; Figure 5 is the internal schematic diagram of the circular groove of the present invention; Figure 6 is the connection schematic diagram of the circular groove and the arc-shaped block of the present invention; Figure 7 is the structural schematic diagram of the T-shaped block and the connecting rod of the present invention; Figure 8 is the structural schematic diagram of the pull shaft, the gear and the pull plate of the present invention; Figure 9 is the cross-sectional view of the cylinder of the present invention; Figure 10 is the schematic diagram of the detection mechanism of the present invention; Figure 11 is the cross-sectional view of the detection mechanism of the present invention.

[0019] In the figure: 1. High-pressure centrifugal compressor body; 2. Intake pipe; 3. Exhaust pipe; 4. First ring; 5. Second ring; 6. Sealing ring; 7. Circular groove; 8. Tooth ring; 9. Pulling shaft; 10. Gear; 11. Pulling plate; 12. Long strip hole; 13. Arc-shaped block; 14. T-shaped groove; 15. Rectangular groove; 16. T-shaped block; 17. Connecting rod; 18. Cylinder; 19. Round rod; 20. First spring; 21. Operating ring; 22. Limit ring; 23. First semi-cylindrical cover; 24. Second semi-cylindrical cover; 25. Detection cylinder; 26. Prompt cylinder; 27. First sliding plate; 28. Prompt rod; 29. Exhaust cylinder; 30. Second sliding plate; 31. Air release hole; 32. Second spring. Detailed implementation manners

[0020] The following will refer to the accompanying drawings to describe the embodiments of the present invention in detail. Those skilled in the art should understand that these implementation manners are only used to explain the technical principle of the present invention and are not intended to limit the protection scope of the present invention.

[0021] As Figures 1-11 shown, a high-pressure centrifugal compressor includes a high-pressure centrifugal compressor body 1. An intake pipe 2 and an exhaust pipe 3 are provided on the high-pressure centrifugal compressor body 1. The exhaust pipe 3 and an external pipe are connected by a connecting mechanism. The connecting mechanism includes a first ring 4 and a second ring 5. The first ring 4 is fixedly connected to the outer surface of the exhaust pipe 3, and the second ring 5 is fixedly connected to the outer surface of the external pipe. Sealing rings 6 that are in close contact with each other are installed on the mutually approaching surfaces of the first ring 4 and the second ring 5, and the two sealing rings 6 are respectively in close contact with the mutually approaching ends of the exhaust pipe 3 and the external pipe. The sealing ring 6 adopts a stepped lip structure and is made of high-temperature resistant silicone rubber. The lip direction is the same as the gas pressure direction, and it can be automatically tensioned under the action of the gas pressure to improve the sealing reliability.

[0022] Four pulling shafts 9 are slidably installed inside the first ring 4. One end of the pulling shaft 9 is fixedly connected to a pulling plate 11. A long strip hole 12 for the pulling plate 11 to pass through is provided inside the second ring 5. A circular groove 7 is provided inside the first ring 4. A rotary tensioning assembly is provided inside the circular groove 7. The rotary tensioning assembly includes a tooth ring 8 and four gears 10. The tooth ring 8 and the four gears 10 are rotatably installed inside the circular groove 7. The gears 10 are key-connected to the pulling shafts 9. The four gears 10 are all meshed with the tooth ring 8. An operating ring 21 is sleeved outside the exhaust pipe 3. One end of the four pulling shafts 9 away from the pulling plate 11 is slidably connected inside the operating ring 21. The pulling shaft 9 can slide along the gear 10, and the rotation of the gear 10 can drive the pulling shaft 9 to rotate. A boss ring is provided at one end of the pulling shaft 9 located inside the operating ring 21, and the operating ring 21 is correspondingly provided with an annular groove for installing the boss ring, aiming to prevent the pulling shaft 9 from moving when the operating ring 21 rotates, while when the operating ring 21 moves horizontally, it will drive the pulling shaft 9 to move accordingly (refer to Figure 6and Figure 8 ), the gear 10 is rotationally connected to the first ring 4 through a limiting ring 22. A limiting groove adapted to the limiting ring 22 is provided inside the first ring 4. An arc-shaped block 13 is fixedly connected inside the circular groove 7. A T-shaped groove 14 is provided inside the arc-shaped block 13. A T-shaped block 16 is slidably connected inside the T-shaped groove 14. A connecting rod 17 is fixedly connected to the T-shaped block 16. The other end of the connecting rod 17 is fixedly connected to the operating ring 21. A rectangular groove 15 for the T-shaped block 16 to slide up and down is provided inside the arc-shaped block 13, and the rectangular groove 15 communicates with the end of the T-shaped groove 14. A cylinder 18 is fixedly connected to the side of the gear ring 8 close to the operating ring 21. A first spring 20 is fixedly connected inside the cylinder 18. The other end of the first spring 20 is fixedly connected to a round rod 19. The other end of the round rod 19 slidably penetrates through the cylinder 18 and is fixedly connected to the operating ring 21. When the operating ring 21 rotates, the T-shaped block 16 first rotates circumferentially along the T-shaped groove 14. When it rotates to the rectangular groove 15, under the elastic force of the first spring 20, the T-shaped block 16 drives the operating ring 21 to slide axially along the rectangular groove 15, and then pulls the pull plate 11 through the pull shaft 9, so that the second ring 5 presses the first ring 4 tightly, realizing the dynamic pressing of the sealing ring 6. Due to the rotational fit between the limiting ring 22 and the limiting groove, it is ensured that the gear 10 and the gear ring 8 remain meshed during the rotation process. At the same time, by using the energy storage characteristic of the first spring 20, an axial pressing force is continuously provided to offset the loosening tendency caused by vibration.

[0023] A detection mechanism is provided between the exhaust pipe 3 and the external pipe. The detection mechanism can completely cover the connection mechanism, and there is a gap for gas flow between the connection mechanism and the detection mechanism. The detection mechanism includes a first semi-circular cover 23 and a second semi-circular cover 24. The first semi-circular cover 23 and the second semi-circular cover 24 are arranged on the connection between the exhaust pipe 3 and the external pipe, and the surfaces of the first semi-circular cover 23 and the second semi-circular cover 24 close to each other are fixedly connected. A detection cylinder 25 is fixedly communicated with the outer surface of the first semi-circular cover 23. A prompt cylinder 26 is fixedly communicated with the top of the detection cylinder 25. First chutes are provided inside both the detection cylinder 25 and the prompt cylinder 26. The two first chutes are concentric and communicated. A first slide plate 27 is slidably connected inside the first chute. The first slide plate 27 is integrally formed with a counterweight block. A prompt rod 28 is fixedly connected to the upper surface of the first slide plate 27. A circular hole for the prompt rod 28 to pass through is provided at the top of the prompt cylinder 26. The top end of the prompt rod 28 is provided with a spherical end, and the surface is coated with a fluorescent warning coating.

[0024] An exhaust cylinder 29 is fixedly connected to the outer surface of the second semi-circular cover 24. Second chutes are provided inside both the exhaust cylinder 29 and the second semi-circular cover 24. The two second chutes are concentric and communicated. A second slide plate 30 is slidably connected inside the second chute. A second spring 32 is fixedly connected to the side of the second slide plate 30 close to the exhaust cylinder 29. The other end of the second spring 32 is fixedly connected to the inner wall of the exhaust cylinder 29. An air leakage hole 31 is provided inside the exhaust cylinder 29.

[0025] Working principle: Initial state: The pull plate 11 is axially aligned with the long hole 12, the T-block 16 is located at the starting end of the T-slot 14, the first spring 20 is in a compressed state, but is limited by the obstruction of the arc block 13 and cannot push the operating ring 21 to slide outward. The first slide plate 27 of the detection mechanism is located at the bottom of the detection tube 25 under the action of the gravity of the counterweight block, the prompt rod 28 is completely retracted into the prompt tube 26, and the second slide plate 30 closes the air leakage hole 31 under the action of the second spring 32.

[0026] Connection process: Push the outer pipe axially until it is pressed against the exhaust pipe 3, align the first ring 4 with the second ring 5, and pass the pull plate 11 through the long hole 12. At this time, it is in an aligned state, so it can pass through easily. Then rotate the operating ring 21 clockwise. The operating ring 21 drives the gear ring 8 to rotate through the connection between the cylinder 18 and the round rod 19. The rotation of the gear ring 8 can drive the four gears 10 to rotate 90° each (the gear 10 will rotate 90° only when the operating ring 21 rotates to the maximum extent). The gear 10 can drive the pull shaft 9 and the pull plate 11 to rotate. At this time, the pull plate 1 1 is vertically staggered with the long strip hole 12. At the same time, the operation ring 21 rotates to drive the T-shaped block 16 to slide along the T-shaped groove 14 through the connecting rod 17. When the T-shaped block 16 rotates to the rectangular groove 15, the arc block 13 will no longer block the T-shaped block 16. Then the elastic force of the first spring 20 pushes the round rod 19, driving the operation ring 21, the pull shaft 9 and the pull plate 11 to move axially. The end of the pull plate 11 hooks the second circular ring 5, and the second circular ring 5 is tightly pulled toward the first circular ring 4, so that the two sealing rings 6 are compressed and deformed to form a high-pressure seal.

[0027] When disassembling, press the operating ring 21 inward to the maximum extent, and then rotate the operating ring 21 in the opposite direction to the initial position, the T-slot 14 will block the T-block 16, and the pull plate 11 and the long hole 12 will rotate to be flush, and then it can be directly removed.

[0028] When the connection leaks due to looseness or wear of the sealing ring 6, the leaking gas enters the closed detection chamber formed by the first semicircular cover 23 and the second semicircular cover 24. The gas thrust overcomes the weight of the counterweight of the first slide plate 27, pushing the first slide plate 27 up along the first slide groove, and the prompt rod 28 extends out of the top round hole of the prompt tube 26, with the red warning end exposed, reminding the operator to perform timely maintenance.

[0029] If a sudden large amount of leakage occurs or the system is overpressured, the pressure in the detection chamber rises sharply in a short time. The gas pressure overcomes the pre-tightening force of the second spring 32, pushes open the second slide plate 30, and the high-pressure gas is discharged to the external safe area through the air vent 31, avoiding the explosion of the detection mechanism due to excessive pressure. After the pressure relief, the second spring 32 resets and pushes the second slide plate 30 to close the air vent 31 again, maintaining the normal detection function.

[0030] It should be noted that in the description of the present invention, the terms indicating directions or positional relationships such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0031] In addition, it should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0032] So far, the technical solution of the present invention has been described in combination with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the present invention.

Claims

1. A high-pressure centrifugal compressor, comprising a high-pressure centrifugal compressor body (1), characterized in that, An air inlet pipe (2) and an exhaust pipe (3) are provided on the high-pressure centrifugal compressor body (1). The exhaust pipe (3) is connected to an external pipe through a connecting mechanism, and a detection mechanism is covered between the exhaust pipe (3) and the external pipe; The connecting mechanism includes a first ring (4) and a second ring (5). The first ring (4) is fixedly connected to the outer surface of the exhaust pipe (3), and the second ring (5) is fixedly connected to the outer surface of the external pipe. Sealing rings (6) that are in close contact with each other are installed on the mutually approaching surfaces of the first ring (4) and the second ring (5), and the two sealing rings (6) are respectively in close contact with the mutually approaching ends of the exhaust pipe (3) and the external pipe. Four pull shafts (9) are slidably installed inside the first ring (4). One end of the pull shaft (9) is fixedly connected to a pull plate (11). A long slot (12) for the pull plate (11) to pass through is formed inside the second ring (5). A circular groove (7) is formed inside the first ring (4), and a rotary tensioning assembly is arranged inside the circular groove (7).

2. The high-pressure centrifugal compressor according to claim 1, characterized in that, The rotary tensioning assembly includes a toothed ring (8) and four gears (10). The toothed ring (8) and the four gears (10) are rotatably installed inside the circular groove (7). The gears (10) are connected to the pull shafts (9) through keys, and the four gears (10) are all meshed with the toothed ring (8).

3. The high-pressure centrifugal compressor according to claim 2, wherein, An operation ring (21) is sleeved outside the exhaust pipe (3). The ends of the four pull shafts (9) away from the pull plate (11) are all slidably connected inside the operation ring (21).

4. A high-pressure centrifugal compressor according to claim 3, characterized in that, An arc-shaped block (13) is fixedly connected inside the circular groove (7). A T-shaped groove (14) is formed inside the arc-shaped block (13). A T-shaped block (16) is slidably connected inside the T-shaped groove (14). A connecting rod (17) is fixedly connected to the T-shaped block (16), and the other end of the connecting rod (17) is fixedly connected to the operation ring (21).

5. A high-pressure centrifugal compressor according to claim 4, characterized in that, A rectangular groove (15) for the T-shaped block (16) to slide up and down is formed inside the arc-shaped block (13), and the rectangular groove (15) is communicated with the end of the T-shaped groove (14).

6. The high-pressure centrifugal compressor according to claim 5, characterized in that, A cylinder (18) is fixedly connected to the surface of the toothed ring (8) close to the operation ring (21). A first spring (20) is fixedly connected inside the cylinder (18). The other end of the first spring (20) is fixedly connected to a round rod (19). The other end of the round rod (19) slidably penetrates through the cylinder (18) and is fixedly connected to the operation ring (21).

7. The high-pressure centrifugal compressor according to claim 1, characterized in that, The detection mechanism includes a first semi-cylindrical cover (23) and a second semi-cylindrical cover (24). The first semi-cylindrical cover (23) and the second semi-cylindrical cover (24) cover the connection part between the exhaust pipe (3) and the external pipe, and the mutually approaching surfaces of the first semi-cylindrical cover (23) and the second semi-cylindrical cover (24) are fixedly connected. A detection cylinder (25) is fixedly communicated with the outer surface of the first semi-cylindrical cover (23). A prompt cylinder (26) is fixedly communicated with the top of the detection cylinder (25), and first chutes are formed inside both the detection cylinder (25) and the prompt cylinder (26). The two first chutes are concentric and communicated.

8. The high-pressure centrifugal compressor according to claim 7, characterized in that A first sliding plate (27) is slidably connected inside the first sliding groove. The first sliding plate (27) is integrally formed with a counterweight. A prompting rod (28) is fixedly connected to the upper surface of the first sliding plate (27). A round hole for the prompting rod (28) to pass through is formed at the top of the prompting cylinder (26).

9. The high-pressure centrifugal compressor according to claim 7, characterized in that, An exhaust cylinder (29) is fixedly connected to the outer surface of the second semi-cylindrical cover (24). Second sliding grooves are formed inside both the exhaust cylinder (29) and the second semi-cylindrical cover (24). The two second sliding grooves are concentric and communicate with each other. A second sliding plate (30) is slidably connected inside the second sliding groove. A second spring (32) is fixedly connected to one side of the second sliding plate (30) close to the exhaust cylinder (29). The other end of the second spring (32) is fixedly connected to the inner wall of the exhaust cylinder (29).

10. A high-pressure centrifugal compressor according to claim 9, characterized in that, A vent hole (31) is formed inside the exhaust cylinder (29).

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