Process gas screw compressor double-mechanical-seal device and using method

Abstract

The invention relates to the technical field of sealing parts, in particular to a process gas screw compressor double-mechanical-seal device and a using method.The process gas screw compressor double-mechanical-seal device comprises a mounting base, a movable ring assembly used for sealing is arranged on the mounting base, a connecting assembly is arranged on the movable ring assembly, and a linkage assembly is arranged at the side end of the connecting assembly; a control assembly is arranged on the linkage assembly, a static ring assembly is arranged on one side of the control assembly, and an auxiliary assembly is arranged at the side end of the static ring assembly. Through work of the moving ring assembly and the static ring assembly, pressure can be stably applied to the moving ring, meanwhile, tight attachment of the sealing faces of the moving ring and the static ring can be stably kept when fluid pressure fluctuation is large, and the sealing effect and stability are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of sealing technology, specifically to a dual mechanical seal device for a process gas screw compressor and its usage method. Background Technology

[0002] In equipment such as centrifugal pumps and compressors, the drive shaft runs through the inside and outside of the equipment, and there is a circumferential gap between the shaft and the equipment. The medium in the equipment leaks out through this gap. If the pressure inside the equipment is lower than atmospheric pressure, air leaks into the equipment. Therefore, a shaft sealing device is necessary to prevent leakage. Mechanical seals are one type of shaft sealing device.

[0003] In existing technologies, when mechanical seal devices are in operation, the rotating ring typically moves axially towards the stationary ring due to the fluid pressure within the sealing cavity. Since the rotating ring is usually kept in contact with the stationary ring end face by dynamic compensation via a spring, and the spring connection point is usually fixed separately to the rotating ring, the compensation force applied to the rotating ring is uneven, leading to incomplete contact between the rotating and stationary rings and insufficient sealing performance. Furthermore, when the fluid pressure is too high, the increased displacement distance of the rotating ring accelerates damage to the sealing surface. When fluid pressure fluctuates, the rotating ring needs to withstand rotational inertia, causing dynamic compensation to lag, resulting in momentary leakage and low stability. Therefore, a device is needed that can stably apply pressure to the rotating ring while maintaining a tight seal between the rotating and stationary ring sealing surfaces even with large fluid pressure fluctuations, to avoid insufficient sealing performance and low stability. Summary of the Invention

[0004] The purpose of this invention is to provide a dual mechanical seal device for a process gas screw compressor and its usage method, to solve the problems mentioned in the background art. To achieve the above objective, this invention provides the following technical solution: A dual mechanical seal device for a process gas screw compressor, comprising a mounting base, a rotating ring assembly for sealing on the mounting base, a connecting assembly on the rotating ring assembly, a linkage assembly on the side end of the connecting assembly, a control assembly on the linkage assembly, a stationary ring assembly on one side of the control assembly, and an auxiliary assembly on the side end of the stationary ring assembly.

[0005] Preferably, the rotating ring assembly includes a mounting groove formed inside the mounting base, a positioning seat provided at the side end of the mounting groove, connecting rods evenly distributed around the positioning seat, the other end of the connecting rods being connected to the side end of the mounting base, a rotating ring sleeve rotatably connected inside the mounting groove, an annular groove being formed on the side of the rotating ring sleeve facing the positioning seat, a locking sleeve being provided inside the rotating ring sleeve, and a sealing ring being provided at the side end of the locking sleeve and located inside the rotating ring sleeve.

[0006] Preferably, the connecting assembly includes a plurality of trigger balls, which are evenly arranged in a ring within an annular groove. A rod is connected to the side end of each trigger ball, and the end of the rod slides laterally into the annular groove. Rotating frames are symmetrically arranged on both sides of each trigger ball, with the side ends of the rotating frames connected to the inner wall of the annular groove. An L-shaped trigger is rotatably connected to the rotating frame. A semi-circular sleeve is connected to the side of the L-shaped trigger near the rod via an L-shaped rod and is located on one side of the trigger ball. The side of the L-shaped trigger near the trigger ball is arc-shaped. The side end of the moving ring sleeve is movably connected to the side end of the positioning seat via a locking spring. The locking spring end of the moving ring sleeve is located on one side of each trigger ball and is engaged within every two symmetrically arranged L-shaped triggers.

[0007] Preferably, the linkage component includes a first arc-shaped block fixed to the end of the cue away from the trigger ball, the first arc-shaped block being slidably disposed in an annular groove, a second arc-shaped block being disposed above the first arc-shaped block, the second arc-shaped block being staggered with the first arc-shaped block, the side end of the second arc-shaped block being movably connected to the outer side of the moving ring sleeve via a telescopic rod, a plurality of the first arc-shaped blocks being connected by arc-shaped sealing rings, and a plurality of the arc-shaped sealing rings being slidably engaged with the annular groove.

[0008] Preferably, the control component includes an auxiliary groove, which is located at the bottom of the second arc-shaped block away from the first arc-shaped block. A control spring telescopic rod is provided in the auxiliary groove, and the telescopic end of the control spring telescopic rod is arc-shaped and slides in cooperation with the inner wall of the auxiliary groove.

[0009] Preferably, the stationary ring assembly includes a control groove formed inside the mounting base. The control groove is formed at the side end of the mounting groove and is connected in the middle. A stationary ring sleeve is provided in the control groove and is slidably engaged with it. The surface of the stationary ring sleeve has a plurality of locking holes. The position of each locking hole corresponds to the position of each control spring telescopic rod. Each locking hole has an arc-shaped part on the side near the moving ring sleeve. An O-ring seal is laid inside the side of the stationary ring sleeve away from the moving ring sleeve. A control plate is provided at the top of the side of the stationary ring sleeve away from the moving ring sleeve. A locking rod is provided at the bottom of the control plate. A plurality of auxiliary spring telescopic rods are evenly laid around the inner perimeter of the side of the stationary ring sleeve away from the moving ring sleeve. The tail of the auxiliary spring telescopic rod is connected to the inner wall of the control groove.

[0010] Preferably, the auxiliary component includes a control ring rotatably disposed on the side of the stationary ring sleeve. The control ring is rotatably disposed within a control groove. A curved groove is formed on the top of the control ring. The bottom of the locking rod is embedded in the curved groove and slidably engaged with it. Several arc-shaped sliding grooves are formed on the side of the control ring away from the stationary ring sleeve. The arc-shaped sliding grooves are evenly distributed on the control ring with the control ring as the center. A linkage rod is slidably engaged in each arc-shaped sliding groove. The end of the linkage rod is connected to the side of an arc-shaped abutment. The arc-shaped abutment is slidably disposed within a sliding frame. The sliding frame is connected to the side of the stationary ring sleeve. The sliding frame is telescopic. Every two arc-shaped abutments are movably connected by an arc-shaped connecting rod. The arc-shaped abutment and the arc-shaped connecting rod are slidably engaged. Sealing gaskets are laid on the outer sides of both the arc-shaped abutment and the arc-shaped connecting rod.

[0011] Preferably, the mounting base can be installed on the outside of the machine body through the housing, the housing covers the outside of the machine body's output shaft, the bottom of the housing is connected to an oil return pipe through an oil return port, and the other end of the oil return pipe is connected to the air intake end of the machine body.

[0012] Preferably, the method of using the dual mechanical seal device for a process gas screw compressor includes the following steps: S1: The operator installs the mounting base on the outside of the machine body and installs the moving ring sleeve on the power shaft through the locking sleeve. Then, during the operation of the machine body, when the fluid pressure increases, pressure is applied to the rotating moving ring sleeve. Under the action of the positioning seat and the locking spring, the moving ring sleeve moves towards the stationary ring assembly. Since the end of the locking spring connected to the moving ring sleeve is embedded in the annular groove and moves into the annular groove against the trigger ball, the two L-shaped triggers are driven to deflect in opposite directions under the action of the rotating frame through the cooperation of the semi-arc sleeve and the L-shaped rod, thus locking the two L-shaped triggers on the side ends. The ball rod makes the second arc block and the first arc block slide towards the stationary ring assembly, so that the pressure acting on the side end of the moving ring sleeve can be evenly distributed, allowing it to move stably under uniform compensation force. S2: When the fluid pressure fluctuates to the set threshold, the locking spring gradually stretches, causing the end of the locking spring to gradually disengage from the annular groove through the L-shaped trigger. During the disengagement process, the two L-shaped triggers rotate, causing the semi-arc sleeve to squeeze the trigger ball to the other side of the L-shaped trigger. Under the action of the telescopic rod, the first and second arc blocks move towards the moving ring sleeve, causing the control spring telescopic rod originally located in the lock hole to move. With the help of the arc component, each control spring telescopic rod retracts in the auxiliary groove and disengages from the lock hole one by one. When the locking spring stretches to the threshold, all control spring telescopic rods disengage, thereby unlocking the stationary ring sleeve. Under the action of the auxiliary spring telescopic rod, the stationary ring sleeve moves along the control groove, thereby moving in the opposite direction to the moving ring sleeve, causing each lock hole to move back to the position of the control spring telescopic rod. Through the arc component, the telescopic end of the control spring telescopic rod is re-locked, achieving a tight bidirectional fit with the moving ring sleeve. S3: When the stationary ring moves, the control plate and the locking rod drive the control ring to rotate under the action of the curved groove. Then, through the cooperation of the arc-shaped sliding groove and the linkage rod, several arc-shaped contact parts slide along the sliding frame and move away from the center of the control ring. During the movement, the arc-shaped connecting rod unfolds and then abuts against the outside of the connection between the power shaft and the machine body.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: In this invention, when the device is in use, the operator installs it on the outside of the machine body and mounts the rotating ring assembly on the power shaft. During machine operation, as the fluid pressure increases, the rotating ring assembly moves towards the stationary ring assembly. Through the connecting components, the rotating ring assembly is stably stressed, causing the sealing end to contact the stationary ring assembly. When the fluid pressure fluctuates to a set threshold, the linkage components activate the control components, unlocking the stationary ring assembly and causing it to move in the opposite direction, achieving a tight fit with the rotating ring assembly. The auxiliary components further enhance the sealing effect. This process avoids uneven compensation force applied to the rotating ring, ensuring complete fit between the rotating and stationary rings, thus improving the sealing effect and preventing damage to the sealing surface caused by increased rotating ring displacement. Furthermore, it prevents dynamic compensation lag during rotational inertia, preventing instantaneous leakage and improving stability.

[0014] In this invention, the combined use of components such as the rotating ring assembly and the connecting assembly ensures that the pressure acting on the side of the rotating ring sleeve is evenly distributed, enabling it to move stably under uniform compensation force. The arc-shaped sealing ring increases the sealing performance between the rotating ring sleeve and the stationary ring assembly, and simultaneously enhances the sealing between the rotating ring sleeve and the power shaft. This avoids uneven compensation force applied to the rotating ring, ensures complete fit between the rotating ring and the stationary ring, and thus improves the sealing effect. In this invention, the coordinated use of components such as the control assembly and the stationary ring assembly avoids the increased displacement distance of the rotating ring, which accelerates the damage to the sealing surface. This prevents dynamic compensation lag during the rotational inertia process of the rotating ring, thus preventing instantaneous leakage and improving stability. When the fluid pressure decreases, the locking spring resets and re-locks into the two L-shaped triggers, simultaneously squeezing the trigger ball. The ball rod drives the first and second arc-shaped blocks to reset. During the reset process, the stationary ring sleeve is reset by controlling the cooperation of the spring extension rod and the locking hole.

[0015] In this invention, by using auxiliary components and other parts in conjunction, the arc-shaped connecting rod is driven to unfold during the movement of the stationary ring sleeve, thereby abutting against the outside of the connection between the power shaft and the machine body, further increasing the sealing effect and improving the practicality of the device.

[0016] In this invention, when the sealing surface between the moving ring sleeve and the stationary ring sleeve is damaged due to prolonged use, some lubricating oil leaks from between the moving ring sleeve and the stationary ring sleeve. At this time, the lubricating oil leaks into the housing. Since the pressure at the air inlet of the machine body is always less than that at the exhaust end, it is relatively negative pressure. The lubricating oil inside the housing can be drawn into the air inlet through the oil return port and oil return pipe at the bottom end, and then re-enter the machine body to participate in lubrication. This ensures that the machine body will not be damaged due to seal failure, and also avoids the occurrence of gas leakage. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a cross-sectional view of the mounting base in this invention; Figure 3 This is a partial three-dimensional structural diagram of the present invention. Figure 1 ; Figure 4 This is a partial three-dimensional structural diagram of the dynamic ring assembly and the connecting assembly in this invention; Figure 5 This is a schematic diagram of the three-dimensional structure of the partial explosion in this invention; Figure 6 for Figure 5 Enlarged view of region A in the middle; Figure 7 This is a partial three-dimensional structural diagram of the present invention. Figure 2 ; Figure 8 This is a cross-sectional view of the second arc-shaped block in this invention; Figure 9 This is a partial three-dimensional structural diagram of the present invention. Figure 3 ; Figure 10 This is a partial three-dimensional structural diagram of the stationary ring assembly and auxiliary assembly in this invention; Figure 11 for Figure 10 Enlarged diagram of region B in the middle; Figure 12 This is a schematic diagram of the invention in operation; Figure 13 This is a cross-sectional view of the shell in this invention.

[0018] In the diagram: 1. Mounting base; 2. Moving ring assembly; 21. Mounting groove; 22. Positioning seat; 23. Connecting rod; 24. Moving ring sleeve; 25. Annular groove; 26. Locking sleeve; 27. Sealing ring; 3. Connecting assembly; 31. Trigger ball; 32. Ball rod; 33. Rotating frame; 34. L-shaped trigger element; 35. L-shaped rod; 36. Semi-arc sleeve; 37. Locking spring; 4. Linkage assembly; 41. First arc block; 42. Second arc block; 43. Telescopic rod; 44. Arc-shaped sealing ring; 5. Control Components; 51. Auxiliary groove; 52. Control spring telescopic rod; 6. Stationary ring assembly; 61. Control groove; 62. Stationary ring sleeve; 63. Lock hole; 64. Arc-shaped part; 65. Control board; 66. Locking rod; 67. Auxiliary spring telescopic rod; 7. Auxiliary assembly; 71. Control ring; 72. Curved groove; 73. Arc-shaped slide groove; 74. Linkage rod; 75. Arc-shaped contact part; 76. Sliding frame; 77. Arc-shaped connecting rod; 8. Housing; 9. Machine body; 10. Oil return port; 11. Oil return pipe; 12. Air inlet end. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figures 1 to 11 The present invention provides a technical solution: a double mechanical seal device for a process gas screw compressor, including a mounting base 1, a dynamic ring assembly 2 for sealing on the mounting base 1, a connecting assembly 3 on the dynamic ring assembly 2, a linkage assembly 4 on the side end of the connecting assembly 3, a control assembly 5 on the linkage assembly 4, a stationary ring assembly 6 on one side of the control assembly 5, and an auxiliary assembly 7 on the side end of the stationary ring assembly 6.

[0021] In this embodiment, as Figures 1 to 7As shown, the moving ring assembly 2 includes a mounting groove 21 formed inside the mounting base 1. A positioning seat 22 is provided at the side end of the mounting groove 21. Connecting rods 23 are evenly distributed around the positioning seat 22. The other end of the connecting rods 23 is connected to the side end of the mounting base 1. A moving ring sleeve 24 is rotatably connected inside the mounting groove 21. An annular groove 25 is formed on the side of the moving ring sleeve 24 facing the positioning seat 22. A locking sleeve 26 is provided inside the moving ring sleeve 24. A sealing ring 27 is provided at the side end of the locking sleeve 26 and is located inside the moving ring sleeve 24. The connecting assembly 3 includes a plurality of trigger balls 31, which are evenly arranged in a ring within an annular groove 25. A rod 32 is connected to the side end of each trigger ball 31, and the end of the rod 32 slides laterally with the annular groove 25. A rotating frame 33 is symmetrically arranged on both sides of each trigger ball 31, and the side end of the rotating frame 33 is connected to the inner wall of the annular groove 25. An L-shaped trigger 34 is rotatably connected to the rotating frame 33. A semi-arc sleeve 36 is connected to the side of the L-shaped trigger 34 near the rod 32 via an L-shaped rod 35 and is located on one side of the trigger ball 31. The side of the L-shaped trigger 34 near the trigger ball 31 is arc-shaped. The side end of the moving ring sleeve 24 is movably connected to the side end of the positioning seat 22 via a locking spring 37. The end of the locking spring 37 on the side end of the moving ring sleeve 24 is located on one side of each trigger ball 31 and is locked in each pair of symmetrically arranged L-shaped triggers 34. The linkage component 4 includes a first arc-shaped block 41 fixed to the end of the cue stick 32 away from the trigger ball 31. The first arc-shaped block 41 is slidably disposed in the annular groove 25. A second arc-shaped block 42 is disposed above the first arc-shaped block 41. The second arc-shaped block 42 is staggered with the first arc-shaped block 41. The side end of the second arc-shaped block 42 is movably connected to the outer side of the moving ring sleeve 24 through a telescopic rod 43. A plurality of first arc-shaped blocks 41 are connected by arc-shaped sealing rings 44. A plurality of arc-shaped sealing rings 44 are slidably engaged with the annular groove 25. The operator installs the mounting base 1 on the outside of the machine body 9 and mounts the rotating ring sleeve 24 onto the power shaft using the locking sleeve 26. During operation of the machine body 9, as the fluid pressure increases, pressure is applied to the rotating ring sleeve 24. Under the action of the positioning seat 22 and the locking spring 37, the rotating ring sleeve 24 moves towards the stationary ring assembly 6. Since one end of the locking spring 37 connected to the rotating ring sleeve 24 is embedded in the annular groove 25 and abuts against the trigger ball 31, it moves into the annular groove 25. Then, through the cooperation of the semi-circular sleeve 36 and the L-shaped rod 35, it drives the two L-shaped triggers 34 to rotate on the rotating frame 3. Under the action of 3, the opposite deflection occurs, thereby locking onto the side ends of the two L-shaped triggers 34. The ball rod 32 causes the second arc-shaped block 42 and the first arc-shaped block 41 to slide toward the stationary ring assembly 6, thereby ensuring that the pressure acting on the side end of the moving ring sleeve 24 is evenly distributed, allowing it to move stably under uniform compensation force. The arc-shaped sealing ring 44 increases the sealing between the moving ring sleeve 24 and the stationary ring assembly 6, while the sealing ring 27 further increases the sealing between the moving ring sleeve 24 and the power shaft. This avoids uneven compensation force applied to the moving ring, ensuring complete fit between the moving ring and the stationary ring, thereby improving the sealing effect.

[0022] In this embodiment, as Figures 8 to 11 As shown, the control component 5 includes an auxiliary groove 51, which is located at the bottom of the second arc-shaped block 42 away from the first arc-shaped block 41. A control spring telescopic rod 52 is provided in the auxiliary groove 51. The telescopic end of the control spring telescopic rod 52 is arc-shaped and slides in cooperation with the inner wall of the auxiliary groove 51. The stationary ring assembly 6 includes a control groove 61 formed inside the mounting base 1. The control groove 61 is formed at the side end of the mounting groove 21 and is connected in the middle. A stationary ring sleeve 62 is provided in the control groove 61 and is slidably engaged with it. The surface of the stationary ring sleeve 62 is provided with a plurality of locking holes 63. The position of each locking hole 63 corresponds to the position of each control spring telescopic rod 52. An arc-shaped part 64 is provided on the side of each locking hole 63 near the moving ring sleeve 24. An O-ring seal 27 is laid inside the side of the stationary ring sleeve 62 away from the moving ring sleeve 24. A control plate 65 is provided at the top of the side of the stationary ring sleeve 62 away from the moving ring sleeve 24. A locking rod 66 is provided at the bottom of the control plate 65. A plurality of auxiliary spring telescopic rods 67 are evenly laid around the inner side of the side of the stationary ring sleeve 62 away from the moving ring sleeve 24. The tail of the auxiliary spring telescopic rod 67 is connected to the inner wall of the control groove 61. When the fluid pressure fluctuates to the set threshold, the locking spring 37 gradually stretches, causing the end of the locking spring 37 to gradually disengage from the annular groove 25 through the L-shaped trigger 34. During the disengagement process, the rotation of the two L-shaped triggers 34 causes the semi-arc sleeve 36 to press the trigger ball 31 to the other side of the L-shaped trigger 34. Under the action of the telescopic rod 43, the first arc block 41 and the second arc block 42 move towards the moving ring sleeve 24, causing the control spring telescopic rod 52, which was originally located in the lock hole 63, to move. With the help of the arc member 64, each control spring telescopic rod 52 retracts within the auxiliary groove 51 and disengages from the lock hole 63 one by one. When the locking spring 37 stretches to the threshold, all control spring telescopic rods 52 disengage, thereby unlocking the stationary ring sleeve 62, allowing the stationary ring sleeve 62 to be in the auxiliary spring... Under the action of the telescopic rod 67, it moves along the control groove 61, thereby moving in the opposite direction to the moving ring sleeve 24, causing each locking hole 63 to move back to the position of the control spring telescopic rod 52. Through the arc-shaped part 64, the telescopic end of the control spring telescopic rod 52 is re-locked, achieving a tight fit with the moving ring sleeve 24 in both directions. This avoids the increased displacement distance of the moving ring, which accelerates the damage to the sealing surface. It also prevents dynamic compensation lag during the process of the moving ring bearing rotational inertia, prevents instantaneous leakage, and improves stability. When the fluid pressure decreases, the locking spring 37 resets and re-locks into the two L-shaped trigger parts 34, and simultaneously squeezes the trigger ball 31. Through the ball rod 32, the first arc-shaped block 41 and the second arc-shaped block 42 are reset. During the reset process, through the cooperation of the control spring telescopic rod 52 and the locking hole 63, the stationary ring sleeve 62 is reset.

[0023] In this embodiment, as Figures 10 to 11 As shown, the auxiliary component 7 includes a control ring 71 rotatably disposed on the side of the stationary ring sleeve 62. The control ring 71 is rotatably disposed within the control groove 61. A curved groove 72 is formed on the top of the control ring 71. The bottom of the locking rod 66 is embedded in the curved groove 72 and slides within it. Several arc-shaped sliding grooves 73 are formed on the side of the control ring 71 away from the stationary ring sleeve 62. The several arc-shaped sliding grooves 73 are evenly distributed on the control ring 71 with the control ring 71 as the center. Each arc-shaped sliding groove 73... Each component is slidably fitted with a linkage rod 74. The end of the linkage rod 74 is connected to the side end of the arc-shaped abutment 75. The arc-shaped abutment 75 is slidably disposed in the sliding frame 76. The sliding frame 76 is connected to the side end of the stationary ring sleeve 62. The sliding frame 76 is telescopic. Each pair of arc-shaped abutments 75 is movably connected by an arc-shaped connecting rod 77. The arc-shaped abutment 75 and the arc-shaped connecting rod 77 are slidably fitted. Sealing gaskets are laid on the outer sides of both the arc-shaped abutment 75 and the arc-shaped connecting rod 77. When the stationary ring sleeve 62 moves, the control plate 65 and the locking rod 66 drive the control ring 71 to rotate under the action of the curved groove 72. Then, through the cooperation of the arc-shaped sliding groove 73 and the linkage rod 74, several arc-shaped contact parts 75 slide along the sliding frame 76 and move away from the center of the control ring 71. During the movement, the arc-shaped connecting rod 77 unfolds and then abuts against the outside of the connection between the power shaft and the machine body, further increasing the sealing effect and improving the practicality of the device.

[0024] In this embodiment, as Figures 12 to 13 As shown, the mounting base 1 can be installed on the outside of the machine body 9 through the housing 8. The housing 8 covers the outside of the output shaft of the machine body 9. The bottom of the housing 8 is connected to the oil return pipe 11 through the oil return port 10. The other end of the oil return pipe 11 is connected to the air intake end 12 of the machine body 9. When the sealing surface between the moving ring sleeve 24 and the stationary ring sleeve 62 is damaged due to prolonged use of this device, some lubricating oil will leak from between the moving ring sleeve 24 and the stationary ring sleeve 62. At this time, the lubricating oil leaks into the housing 8. Since the pressure at the air inlet 12 of the machine body 9 is always less than that at the exhaust end, and is relatively negative, the lubricating oil inside the housing 8 can be drawn into the air inlet 12 through the oil return port 10 at the bottom and the oil return pipe 11, and thus re-enter the machine body 9 to participate in lubrication. This ensures that the machine body 9 will not be damaged due to sealing failure, and also avoids the occurrence of gas leakage.

[0025] In this embodiment, as Figures 1 to 11 As shown, a method for using a dual mechanical seal device for a process gas screw compressor includes the following steps: S1: The operator installs the mounting base 1 on the outside of the machine body 9 and installs the moving ring sleeve 24 on the power shaft through the locking sleeve 26. Then, during the operation of the machine body 9, when the fluid pressure increases, pressure is applied to the rotating moving ring sleeve 24. Under the action of the positioning seat 22 and the locking spring 37, the moving ring sleeve 24 moves towards the stationary ring assembly 6. Since the end of the locking spring 37 connected to the moving ring sleeve 24 is embedded in the annular groove 25 and respectively abuts against the trigger ball 31 to move into the annular groove 25, the two L-shaped triggers 34 are driven to deflect in opposite directions under the action of the rotating frame 33 through the cooperation of the semi-arc sleeve 36 and the L-shaped rod 35, thereby locking the two L-shaped triggers 34 on the side ends. The second arc block 42 and the first arc block 41 slide towards the stationary ring assembly 6 through the ball rod 32, so that the pressure acting on the side end of the moving ring sleeve 24 can be evenly distributed, so that it can move stably under the uniform compensation force. S2: When the fluid pressure fluctuates to the set threshold, the locking spring 37 gradually stretches, causing the end of the locking spring 37 to gradually disengage from the annular groove 25 through the L-shaped trigger 34. During the disengagement process, the rotation of the two L-shaped triggers 34 causes the semi-arc sleeve 36 to press the trigger ball 31 to the other side of the L-shaped trigger 34. Thus, under the action of the telescopic rod 43, the first arc block 41 and the second arc block 42 move towards the moving ring sleeve 24, causing the control spring telescopic rod 52, which was originally located in the lock hole 63, to move and retract with the help of the arc member 64. This causes each control spring telescopic rod 52 to retract within the auxiliary groove 51, disengaging from the locking hole 63 one by one. When the locking spring 37 is stretched to the threshold, all control spring telescopic rods 52 disengage, thereby unlocking the stationary ring sleeve 62. The stationary ring sleeve 62 moves along the control groove 61 under the action of the auxiliary spring telescopic rod 67, thus moving in opposite directions to the moving ring sleeve 24, causing each locking hole 63 to move back to the position of the control spring telescopic rod 52. Through the arc-shaped piece 64, the telescopic end of the control spring telescopic rod 52 is re-engaged, achieving a tight bidirectional fit with the moving ring sleeve 24. S3: When the stationary ring sleeve 62 moves, the control plate 65 and the locking rod 66 drive the control ring 71 to rotate under the action of the curved groove 72. Then, through the cooperation of the arc-shaped sliding groove 73 and the linkage rod 74, several arc-shaped contact parts 75 slide along the sliding frame 76 and move away from the center of the control ring 71. During the movement, the arc-shaped connecting rod 77 unfolds and then abuts against the outside of the connection between the power shaft and the machine body.

[0026] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A process gas screw compressor double mechanical seal device, comprising a mounting base (1); characterized in that The mounting base (1) is provided with a dynamic ring assembly (2) for sealing, the dynamic ring assembly (2) is provided with a linkage assembly (3), the side end of the linkage assembly (3) is provided with a linkage assembly (4), the linkage assembly (4) is provided with a control assembly (5), one side of the control assembly (5) is provided with a static ring assembly (6), and the side end of the static ring assembly (6) is provided with an auxiliary assembly (7).

2. A process gas screw compressor dual mechanical seal assembly as claimed in claim 1, wherein: The dynamic ring assembly (2) comprises a mounting groove (21) formed in the mounting base (1); The side end of the mounting groove (21) is provided with a positioning seat (22), the positioning seat (22) is uniformly provided with a connecting rod (23) around, and the other end of the connecting rod (23) is connected with the side end of the mounting base (1); The dynamic ring sleeve (24) is rotatably connected in the mounting groove (21); The side of the dynamic ring sleeve (24) facing the positioning seat (22) is provided with an annular groove (25); The inner side of the dynamic ring sleeve (24) is provided with a locking sleeve (26); The side end of the locking sleeve (26) is provided with a sealing ring (27) and located in the dynamic ring sleeve (24).

3. A process gas screw compressor dual mechanical seal assembly as claimed in claim 2, wherein: The linkage assembly (3) comprises a plurality of trigger spheres (31), and the plurality of trigger spheres (31) are uniformly arranged in the annular groove (25) in a ring shape; The side end of the trigger sphere (31) is connected with a ball rod (32); The trigger sphere (31) is symmetrically provided with a rotating frame (33) on the two sides, and the rotating frame (33) is rotatably connected with an L-shaped trigger piece (34); The side of the L-shaped trigger piece (34) close to the ball rod (32) is connected with a semicircular sleeve (36) through an L-shaped rod (35) and located on one side of the trigger sphere (31); The side end of the dynamic ring sleeve (24) is movably connected with the side end of the positioning seat (22) through a locking spring (37); The locking spring (37) end of the side end of the dynamic ring sleeve (24) is located on one side of one trigger sphere (31) and clamped in every two symmetrically arranged L-shaped trigger pieces (34).

4. A process gas screw compressor dual mechanical seal assembly as claimed in claim 3, wherein: The linkage assembly (4) comprises a first arc-shaped block (41) fixed at the end of the ball rod (32) away from the trigger sphere (31); The upper side of the first arc-shaped block (41) is provided with a second arc-shaped block (42), and the second arc-shaped block (42) is staggered with the first arc-shaped block (41); The side end of the second arc-shaped block (42) is movably connected with the outer side of the dynamic ring sleeve (24) through an extension rod (43); A plurality of first arc-shaped blocks (41) are connected through arc-shaped sealing rings (44).

5. A process gas screw compressor dual mechanical seal assembly as claimed in claim 4, wherein: The control assembly (5) comprises an auxiliary groove (51) formed at the bottom of the end of the second arc-shaped block (42) away from the first arc-shaped block (41); The auxiliary groove (51) is provided with a control spring extension rod (52); The extension end of the control spring extension rod (52) is arc-shaped and is in sliding fit with the inner wall of the auxiliary groove (51).

6. A process gas screw compressor dual mechanical seal assembly as claimed in claim 5, wherein: The static ring assembly (6) comprises a control groove (61) formed in the mounting base (1); The control groove (61) is arranged at the side end of the mounting groove (21) and is in communication at the middle part; The static ring sleeve (62) is arranged in the control groove (61) and is in sliding cooperation with the control groove (61); A plurality of lock holes (63) are arranged on the surface of the static ring sleeve (62); The position of each lock hole (63) corresponds to the position of each control spring telescopic rod (52); Each lock hole (63) is provided with an arc-shaped part (64) on the side close to the dynamic ring sleeve (24); An O-shaped sealing ring (27) is arranged on the inner side of the side of the static ring sleeve (62) away from the dynamic ring sleeve (24); A control plate (65) is arranged on the top of the side of the static ring sleeve (62) away from the dynamic ring sleeve (24); A clamping rod (66) is arranged on the bottom of the control plate (65); A plurality of auxiliary spring telescopic rods (67) are arranged on the inner side of the side of the static ring sleeve (62) away from the dynamic ring sleeve (24); The tail of the auxiliary spring telescopic rod (67) is connected with the inner wall of the control groove (61).

7. A process gas screw compressor dual mechanical seal assembly as claimed in claim 6, wherein: The auxiliary assembly (7) comprises a control ring (71) rotatably arranged at the side end of the static ring sleeve (62); The control ring (71) is rotatably arranged in the control groove (61); A curved groove (72) is arranged on the top of the control ring (71); The bottom of the clamping rod (66) is embedded in the curved groove (72) and is in sliding cooperation with the curved groove (72); A plurality of arc-shaped sliding grooves (73) are arranged on the side of the control ring (71) away from the static ring sleeve (62); Each arc-shaped sliding groove (73) is in sliding cooperation with a linkage rod (74); The end of the linkage rod (74) is connected with the side end of an arc-shaped abutting part (75), and the arc-shaped abutting part (75) is slidably arranged in a sliding frame (76); The sliding frame (76) is connected with the side end of the static ring sleeve (62); The sliding frame (76) is arranged in an extendable manner; Each two arc-shaped abutting parts (75) are movably connected through an arc-shaped connecting rod (77); The arc-shaped abutting part (75) and the arc-shaped connecting rod (77) are in sliding cooperation; The outer sides of the arc-shaped abutting part (75) and the arc-shaped connecting rod (77) are both provided with sealing pads.

8. A process gas screw compressor dual mechanical seal assembly as claimed in claim 1, wherein: The mounting base (1) is mounted on the outer side of the machine body (9) through a shell (8), and the shell (8) covers the outer side of the output shaft of the machine body (9); The bottom of the shell (8) is communicated with an oil return pipeline (11) through an oil return port (10), and the other end of the oil return pipeline (11) is communicated with the air inlet end (12) of the machine body (9).

9. A method of using a process gas screw compressor dual mechanical seal arrangement, using a process gas screw compressor dual mechanical seal arrangement according to any one of claims 1 to 8, characterized in that, The method comprises the following steps: S1: The staff installs the shell (8) on the outside of the machine body (9), and installs the dynamic ring sleeve (24) on the power shaft through the locking sleeve (26), and then during the operation of the machine body (9), when the fluid pressure increases, the dynamic ring sleeve (24) in the rotating process is subjected to pressure, and the dynamic ring sleeve (24) is moved to the static ring assembly (6) under the action of the positioning seat (22) and the locking spring (37), and since one end of the locking spring (37) connected with the dynamic ring sleeve (24) is embedded in the annular groove (25), and respectively abuts against the trigger ball (31) to move into the annular groove (25), and through the cooperation of the semi-arc sleeve (36) and the L-shaped rod (35), the two L-shaped triggers (34) are driven to be oppositely deflected under the action of the rotating frame (33), thereby being clamped at the side ends of the two L-shaped triggers (34), and the second arc-shaped block (42) and the first arc-shaped block (41) are slid towards the static ring assembly (6) through the ball rod (32), thereby enabling the pressure acting on the side end of the dynamic ring sleeve (24) to be uniformly stressed, so that it can stably move under the uniform compensation force; S2: When the fluid pressure fluctuates to a set threshold, the locking spring (37) is gradually stretched at this time, so that the end of the locking spring (37) gradually separates from the L-shaped trigger (34) out of the annular groove (25), and in the process of separation, the two L-shaped triggers (34) are rotated to make the semi-arc sleeve (36) extrude the trigger ball (31) to the other side of the L-shaped trigger (34), so that the first arc-shaped block (41) and the second arc-shaped block (42) move towards the direction of the dynamic ring sleeve (24) under the action of the telescopic rod (43), so that the control spring telescopic rod (52) originally located in the lock hole (63) moves, and is retracted by the arc-shaped part (64), so that each control spring telescopic rod (52) is retracted in the auxiliary groove (51) and gradually separates from the lock hole (63), when the locking spring (37) is stretched to the threshold, so that all the control spring telescopic rods (52) are separated, thereby unlocking the static ring sleeve (62), so that the static ring sleeve (62) moves along the control groove (61) under the action of the auxiliary spring telescopic rod (67), thereby moving oppositely with the dynamic ring sleeve (24) to make each lock hole (63) move to the position of the control spring telescopic rod (52) again, and the telescopic end of the control spring telescopic rod (52) is clamped again through the arc-shaped part (64), so as to realize the close fit with the dynamic ring sleeve (24) in both directions; S3: When the static ring sleeve (62) moves, the control plate (65) and the clamping rod (66) drive the control ring (71) to rotate under the action of the curved groove (72), and then through the cooperation of the arc-shaped sliding groove (73) and the linkage rod (74), a plurality of arc-shaped abutting parts (75) are driven to slide along the sliding frame (76) and move away from the center of the control ring (71), and in the process of moving, the arc-shaped connecting rod (77) is unfolded, and then abuts against the outside of the connection between the power shaft and the machine body.

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