An oligomer removal device, related system and method

Abstract

This invention proposes an oligomer removal device, related systems, and methods. The oligomer removal device comprises a horizontal cylinder and a vertical cylinder connected together. The horizontal cylinder has a discharge port and a vacuum interface, while the vertical cylinder has a feed port and a spray cooling interface. A shaft seal and bearing mechanism are fixed to the outer walls of the two end caps of the horizontal cylinder. A rotating shaft passes through the horizontal cylinder, with each end matched to a shaft seal. An auxiliary sealing mechanism is disposed within the accommodating space between the shaft seal / bearing mechanism and the end caps. The isolation bushing assembly of the auxiliary sealing mechanism is fixed to the end caps and has a clearance fit with the rotating shaft. The rotary sealing assembly of the auxiliary sealing mechanism is fixed to the rotating shaft. In a first working state, there is a preset distance between the isolation bushing assembly and the rotary sealing assembly. In a second working state, the isolation bushing assembly and the rotary sealing assembly are in close contact, and the rotating shaft position is kept fixed under atmospheric pressure to provide auxiliary sealing for the horizontal cylinder. The device enables online replacement of the shaft seal and bearing mechanism.

Description

Technical Field

[0001] This invention relates to an oligomer removal device, related system, and method. Background Technology

[0002] Oligomer removal equipment in polyester plant systems is typically connected to spray cooling and vacuum systems. It cools the small-molecule products entrained in the gaseous medium generated during the polycondensation reaction, allowing the formed oligomers to enter a horizontal cylinder. A scraper inside the cylinder, rotating with a shaft, scrapes the oligomers off the inner wall, collecting them with the liquid phase to a recovery device. This prevents the oligomers from clogging the vacuum equipment and pipelines. Currently, oligomer removal equipment in polyester plant systems generally has external shaft seals and bearings on the drive side, while internal bearings are installed on the non-drive side. Whether the internal bearing on the non-drive side or the external shaft seal and bearing on the drive side fails, repair or replacement can only be performed by shutting down the plant for maintenance. This usually requires depressurizing or breaking the vacuum in the horizontal cylinder of the oligomer removal equipment, and may even require material discharge, causing significant inconvenience to the safe, stable, and long-term operation of the polyester plant system. Summary of the Invention

[0003] The inventors of this invention have discovered that existing equipment capable of online replacement of shaft seals and bearings generally employs a positive pressure system, relying on the internal pressure of the equipment cylinder being greater than the external pressure or on the equipment's own weight to achieve auxiliary sealing of the cylinder. Since oligomer removal equipment is a horizontal negative pressure system, it cannot directly rely on the internal pressure of the cylinder being greater than the external pressure or on the equipment's own weight to achieve auxiliary sealing of the cylinder. Therefore, online replacement of shaft seals and bearings has not yet been achieved while the spray cooling equipment and vacuum equipment of the polyester plant system are in operation. To ensure the long-term stable operation of the polyester plant system, how to achieve online replacement of shaft seals in oligomer removal equipment is an urgent technical problem to be solved. In view of the above problems, this invention proposes an oligomer removal device, related systems, and methods to solve or partially solve the above problems. The technical solution proposed by this invention is as follows:

[0004] As a first aspect of the present invention, the present invention provides an oligomer removal device, including a horizontal cylinder, a vertical cylinder, a shaft seal and bearing mechanism, a rotating shaft, and an auxiliary sealing mechanism;

[0005] The horizontal cylinder is connected to the vertical cylinder. The horizontal cylinder is provided with a discharge port and a vacuum interface, and the vertical cylinder is provided with a feed port and a spray cooling interface.

[0006] The shaft seal and bearing mechanism are fixed to the outer walls of the two end caps of the horizontal cylinder; the rotating shaft passes through the horizontal cylinder and its two ends are respectively matched with the shaft seal and bearing mechanism; the auxiliary sealing mechanism is disposed in the accommodating space between the shaft seal and bearing mechanism and the end cap;

[0007] The auxiliary sealing mechanism includes an isolation bushing assembly and a rotary sealing assembly;

[0008] The isolation bushing assembly is fixed to the end cap and has a clearance fit with the rotating shaft to block particulate impurities inside the horizontal cylinder; the rotary sealing assembly is fixed to the rotating shaft.

[0009] In the first working state, there is a preset distance between the isolation bushing assembly and the rotary sealing assembly;

[0010] In the second working state, the isolation bushing assembly and the rotary sealing assembly are fitted together, and the position of the rotating shaft is kept fixed under atmospheric pressure to provide auxiliary sealing for the horizontal cylinder.

[0011] In one or more optional embodiments, the oligomer removal device further includes: a base and a drive mechanism;

[0012] The drive mechanism is connected to the shaft head of the rotating shaft, and the base is fixedly connected to the horizontal cylindrical body.

[0013] In one or more optional embodiments, in the oligomer removal device, the isolation bushing assembly includes an isolation seal and an auxiliary seal seat, the auxiliary seal seat is fixed to the end cap, and the isolation seal is disposed in the area defined by the end cap and the auxiliary seal seat, and is clearance-fitted with the rotating shaft.

[0014] The rotary sealing assembly includes an auxiliary sealing ring and a rotary sealing ring fixed to the rotating shaft; the auxiliary sealing ring is disposed on the rotary sealing ring, and in the second state, the rotary sealing ring is in sealing engagement with the auxiliary sealing seat.

[0015] In one or more optional embodiments, in the oligomer removal device, the auxiliary sealing seat has a groove at one end away from the isolation seal, and the rotating sealing ring has a boss on one side corresponding to the groove, the inner diameter of the groove matching the outer diameter of the boss.

[0016] In one or more optional embodiments, in the oligomer removal device, the end cap includes a flange, and the auxiliary sealing seat is fixed to the flange;

[0017] The isolation bushing assembly also includes a gasket positioned between the flange and the auxiliary sealing seat.

[0018] In one or more alternative embodiments, the oligomer removal device further includes an auxiliary sealing seat ring disposed between the inner wall of the flange and the outer wall of the auxiliary sealing seat.

[0019] In one or more optional embodiments, the oligomer removal device further includes a shaft-side sealing ring disposed between the rotary sealing ring and the rotating shaft.

[0020] In one or more alternative embodiments, the bearings of the shaft seal and bearing mechanism in the oligomer removal device may be sliding bearings or rolling bearings.

[0021] In one or more alternative embodiments, the oligomer removal device further includes a shaft head nut;

[0022] The shaft head nut is screwed to the rotating shaft and is adapted to abut against the shaft seal and bearing mechanism.

[0023] In one or more alternative embodiments, the shaft seal in the oligomer removal device is a mechanical seal, a skeleton seal, or a labyrinth seal.

[0024] In one or more alternative embodiments, the isolation seal in the oligomer removal device is a filler seal, a comb seal, a labyrinth seal, or a skeleton seal.

[0025] In one or more optional embodiments, in the oligomer removal device, the isolation seal is made of at least one of PEEK, PTFE, RPTFE, ePTFE, and brass.

[0026] As a second aspect of the present invention, the present invention also provides a tooling system for online replacement of shaft seals and bearings, including a shaft push-pull mechanism and an oligomer removal device as described above; wherein:

[0027] The shaft system push-pull mechanism includes a leg, a leg support frame, a flange support frame, a flange component, and a thrust bolt;

[0028] The support leg is fixedly connected to the support leg support frame, and the support leg is adapted to be fixed to the end cap of the horizontal cylinder of the oligomer removal equipment; the support leg support frame is detachably connected to the flange support frame; the flange support frame is fixedly connected to the flange component; the flange component is screwed to the thrust bolt.

[0029] The thrust bolt is adapted to rotate within the flange component to switch the oligomer removal device from a first operating state to a second operating state.

[0030] As a third aspect of the present invention, the present invention also provides a polyester apparatus system, including a spray cooling device, a vacuum device, and an oligomer removal device as described above;

[0031] The spray cooling device is connected to the spray cooling interface of the oligomer removal device, and the vacuuming device is connected to the vacuuming interface of the oligomer removal device.

[0032] As a fourth aspect of the present invention, the present invention also provides a method for online replacement of shaft seals and bearings of an oligomer removal device, applicable to the polyester plant system described above, comprising:

[0033] Stop the rotation of the shaft of the oligomer removal device, and push the shaft to move axially to switch the oligomer removal device from the first working state to the second working state;

[0034] In the second working state, the spray cooling equipment and vacuum equipment are kept running to make the isolation bushing assembly and the rotary sealing assembly fit together, and the position of the rotating shaft is kept fixed under atmospheric pressure, thereby achieving auxiliary sealing of the horizontal cylinder of the oligomer removal equipment.

[0035] Perform online replacement of shaft seals and / or bearings in the shaft seal and bearing mechanism.

[0036] Based on the above technical solution, the beneficial effects of the present invention compared with the prior art are as follows:

[0037] The oligomer removal equipment provided in this invention provides an auxiliary sealing mechanism between the end cover of the horizontal cylinder and the shaft seal and bearing mechanism. An isolation bushing assembly is fixed to the end cover, and a rotary seal assembly is fixed to the rotating shaft. When maintenance or replacement of the shaft seal and bearing mechanism is required, the rotating shaft is moved, causing the rotary seal ring to move as well, ensuring a tight fit between the isolation bushing assembly and the rotary seal assembly. Because the horizontal cylinder is always under negative pressure, the air pressure inside the cylinder is lower than atmospheric pressure. Under atmospheric pressure, the rotating shaft remains fixed, achieving auxiliary sealing of the horizontal cylinder. Furthermore, since the rotating shaft does not move under atmospheric pressure, a tight fit between the isolation bushing assembly and the rotary seal assembly is guaranteed, ensuring a good sealing effect within the horizontal cylinder. Maintenance and replacement of the shaft seal and bearing mechanism are possible without discharging, depressurizing, or breaking the vacuum in the oligomer removal equipment, enabling online replacement of the shaft seal and bearings, thereby ensuring the stable operation of the polyester system using this oligomer removal equipment.

[0038] The oligomer removal device provided in this embodiment of the invention, through the gap cooperation between the isolation bushing assembly of the auxiliary sealing mechanism and the rotating shaft, can prevent particulate impurities inside the horizontal cylinder from moving to the outside of the horizontal cylinder, and avoid particulate impurities from entering the shaft seal and bearing mechanism, damaging the sealing and lubrication system between the shaft seal and the bearing, and causing wear of the shaft seal or bearing.

[0039] The oligomer removal device provided in this invention has both the drive-side and non-drive-side bearings located outside the horizontal cylinder. Since the non-drive-side bearings in existing oligomer removal devices are built-in, maintenance and replacement of the non-drive-side bearings are very inconvenient even when the polyester unit is shut down. Therefore, by placing the non-drive-side bearings externally, the harsh operating conditions inside the equipment and the inability to replace them without stopping the machine are avoided. Compared with the prior art, it is easier to maintain and replace the bearings.

[0040] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained in accordance with the structures particularly pointed out in the description, claims and drawings.

[0041] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0042] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the oligomer removal device provided in an embodiment of the present invention;

[0044] Figure 2 This is a schematic diagram of the auxiliary sealing system provided in the first working state according to an embodiment of the present invention;

[0045] Figure 3 This is a schematic diagram of the auxiliary sealing system provided in the second working state according to an embodiment of the present invention;

[0046] Figure 4 This is a schematic diagram of a system structure for online replacement of shaft seals and bearings provided in an embodiment of the present invention;

[0047] Figure 5 This is a schematic diagram of the shaft push-pull mechanism provided in an embodiment of the present invention.

[0048] in:

[0049] 1 is a horizontal cylinder, 101 is the discharge port, 102 is the vacuum port, 103 is the end cap, and 1031 is the flange.

[0050] 2 is a vertical cylinder, 201 is the feed inlet, and 202 is the spray cooling inlet;

[0051] 3 represents the shaft seal and bearing mechanism;

[0052] 4 is the pivot point;

[0053] 5 is the auxiliary sealing mechanism; 501 is the isolation bushing assembly; 5011 is the isolation seal; 5012 is the auxiliary sealing seat; 50121 is the groove; 5013 is the gasket; 5014 is the auxiliary sealing seat sealing ring; 5015 is the countersunk bolt; 5016 is the anti-loosening washer; 502 is the rotary sealing assembly; 5021 is the rotary sealing ring; 50211 is the boss; 5022 is the auxiliary sealing ring; 5023 is the shaft side sealing ring; 5024 is the tapered set screw.

[0054] 6 represents the base;

[0055] 7 represents the drive mechanism;

[0056] 8 represents the shaft head nut;

[0057] 9 is the shaft push-pull mechanism, 901 is the support leg, 902 is the support leg support frame, 903 is the flange support frame, 904 is the flange component, 905 is the thrust bolt; 906 is the fastener. Detailed Implementation

[0058] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0059] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the invention as detailed in the appended claims.

[0060] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0061] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0062] Example 1

[0063] This invention provides an oligomer removal device, referring to... Figures 1-4 As shown, the oligomer removal equipment includes: a horizontal cylinder 1, a vertical cylinder 2, a shaft seal and bearing mechanism 3, a rotating shaft 4, and an auxiliary sealing mechanism 5;

[0064] The horizontal cylinder 1 is connected to the vertical cylinder 2. The horizontal cylinder 1 is provided with a discharge port 101 and a vacuum interface, and the vertical cylinder 2 is provided with a feed port 201 and a spray cooling interface.

[0065] The shaft seal and bearing mechanism 3 is fixed to the outer wall of the two end caps 103 of the horizontal cylinder 1;

[0066] The rotating shaft 4 passes through the horizontal cylinder 1, and its two ends are respectively matched with the shaft seal and bearing mechanism 3;

[0067] The auxiliary sealing mechanism 5 is disposed in the accommodating space between the shaft seal and bearing mechanism 3 and the end cover 103;

[0068] The auxiliary sealing mechanism 5 includes an isolation bushing assembly 501 and a rotary sealing assembly 502;

[0069] The isolation bushing assembly 501 is fixed to the end cap 103 and is clearance-fitted with the rotating shaft 4 to block particulate impurities inside the horizontal cylinder 1; the rotary sealing assembly 502 is fixed to the rotating shaft 4.

[0070] In the first working state, there is a preset distance between the isolation bushing assembly 501 and the rotary sealing assembly 502;

[0071] In the second working state, the isolation bushing assembly 501 and the rotary sealing assembly 502 are fitted together, and the position of the rotating shaft 4 is kept fixed under atmospheric pressure to provide auxiliary sealing for the horizontal cylinder 1.

[0072] In this embodiment of the invention, the oligomer removal device is a component of a polyester unit system. The horizontal cylinder 1 is connected to the vertical cylinder 2. The horizontal cylinder 1 is provided with a discharge port 101 and a vacuum interface, and the vertical cylinder 2 is provided with a feed port 201 and a spray cooling interface. The spray cooling interface of the oligomer removal device can be connected to the spray cooling equipment of the polyester unit system, and the vacuum interface of the oligomer removal device can be connected to the vacuum equipment of the polyester unit system.

[0073] During the operation of the polyester unit system, a vacuum is applied to the oligomer removal equipment, maintaining a negative pressure state inside the vertical cylinder 2 and horizontal cylinder 1. This draws the gaseous medium generated by the forward reaction and the low-molecular-weight products it carries into the vertical cylinder 2. Then, the gaseous medium is condensed by a cooling spray inside the vertical cylinder 2. The condensed liquid phase and low-molecular-weight polymers (i.e., oligomers) enter the horizontal cylinder 1. Since oligomers easily adhere to the inner wall of the horizontal cylinder 1, a scraper is installed inside the horizontal cylinder 1. This scraper is fixed to the rotating shaft 4 by connecting ribs, allowing it to rotate with the shaft 4 as it rotates, thus scraping off the oligomers from the inner wall of the horizontal cylinder 1. The scraped oligomers are discharged along with the liquid phase from the outlet 101 of the horizontal cylinder 1.

[0074] In this embodiment of the invention, the shaft seal and bearing mechanism 3 is fixed to the outer wall of the two end caps 103 of the horizontal cylinder 1. The rotating shaft 4 passes through the horizontal cylinder 1, and both ends are matched with the shaft seal and bearing mechanism 3 respectively. Through the shaft seal and bearing mechanism 3, the rotating shaft 4 is supported and the horizontal cylinder 1 is sealed, ensuring that the horizontal cylinder 1 is in a negative pressure state.

[0075] In this embodiment of the invention, the isolation bushing assembly 501 of the auxiliary sealing mechanism 5 is fixed to the end cap 103 of the horizontal cylinder 1 and is clearance-fitted with the rotating shaft 4. Since the medium entering the horizontal cylinder 1 includes some particulate impurities, the particulate impurities will move along the rotating shaft 4 during the rotation of the rotating shaft 4. Especially for working conditions where the horizontal cylinder 1 is not very clean and small molecule condensates such as oligomers are easily generated, the clearance fit between the isolation bushing assembly 501 and the rotating shaft 4 can prevent the particulate impurities in the horizontal cylinder 1 from moving to the outside of the horizontal cylinder 1, and prevent the particulate impurities from entering the shaft seal and bearing mechanism 3, damaging the sealing and lubrication system between the shaft seal and the bearing, and causing wear of the shaft seal or bearing.

[0076] In this embodiment of the invention, reference is made to Figure 2 As shown, the first working state can be the normal rotation of the rotating shaft 4, which drives the scraper to rotate, thereby scraping off the oligomers from the inner wall of the horizontal cylinder 1; refer to Figure 3 As shown, the second working state can be a working state in which the rotating shaft 4 moves axially in the forward or reverse direction, so that the isolation bushing assembly 501 and the rotary sealing assembly 502 of the auxiliary sealing mechanism 5 on the drive side are in contact. In this working state, the rotating shaft 4 is no longer driven to rotate, and the scraper cannot rotate to scrape off the oligomers on the inner wall of the horizontal cylinder 1. However, at this time, in order to ensure the stable operation of the polyester unit system, the spray cooling equipment and vacuum equipment of the polyester unit system are still working normally, and the horizontal cylinder 1 of the oligomer removal equipment is still in a negative pressure state. Therefore, the atmospheric pressure is greater than the internal pressure of the horizontal cylinder 1, so under the action of atmospheric pressure, the position of the rotating shaft 4 is fixed, and the isolation bushing assembly 501 and the rotary sealing assembly 502 are tightly in contact, thereby sealing the horizontal cylinder 1 and preventing the outside atmosphere from entering the horizontal cylinder 1 and destroying the negative pressure state of the horizontal cylinder 1. In the second working state, the mechanism located outside the horizontal cylinder 1 can be inspected. Since the shaft seal and bearing mechanism 3 is located on the side of the auxiliary sealing mechanism 5 away from the end cover 103 of the horizontal cylinder 1, online maintenance and replacement of the shaft seal and bearing can be realized.

[0077] The oligomer removal device provided in this embodiment of the invention provides an auxiliary sealing mechanism 5 between the end cap 103 of the horizontal cylinder 1 and the shaft seal and bearing mechanism 3. The isolation bushing assembly 501 is fixed to the end cap 103, and the rotary sealing assembly 502 is fixed to the rotating shaft 4. When maintenance or replacement of the shaft seal and bearing mechanism 3 is required, the rotating shaft 4 is moved to drive the rotary sealing ring 5021 to move together, so that the isolation bushing assembly 501 and the rotary sealing assembly 502 are in contact. Since the horizontal cylinder 1 is always under negative pressure, the air pressure inside the horizontal cylinder 1 is less than the atmospheric pressure. Under the action of atmospheric pressure, the rotating shaft 4 is kept in a fixed position, thereby achieving auxiliary sealing of the horizontal cylinder. Since the rotating shaft 4 will not move under the action of atmospheric pressure, it can ensure that the isolation bushing assembly 501 and the rotary sealing assembly 502 are in close contact, thus ensuring the sealing effect inside the horizontal cylinder. The shaft seal and bearing mechanism 3 can be maintained and replaced without the need for material discharge, pressure relief, or vacuum breaking in the oligomer removal equipment, thus enabling online replacement of shaft seals and bearings in the oligomer removal equipment and ensuring the stable operation of the polyester unit system using this oligomer removal equipment.

[0078] The oligomer removal device provided in this embodiment of the invention has both the drive-side and non-drive-side bearings located outside the horizontal cylinder 1. Since the non-drive-side bearings of the prior art oligomer removal devices are built-in, it is very inconvenient to repair and replace the non-drive-side bearings even when the polyester unit is stopped. Therefore, by placing the non-drive-side bearings externally, the situation where the bearings are in harsh working conditions inside the equipment and cannot be replaced without stopping the equipment is avoided. Compared with the prior art, it is easier to repair and replace the bearings.

[0079] In one specific embodiment, refer to Figure 1 As shown, the oligomer removal device also includes: a base 6 and a drive mechanism 7;

[0080] The drive mechanism 7 is connected to the shaft head of the rotating shaft 4, and the base 6 is fixedly connected to the horizontal cylinder 1.

[0081] The oligomer removal device provided in this embodiment of the invention provides overall support for the device by connecting the base 6 to the horizontal cylindrical body 1, ensuring the working stability of the oligomer removal device. The drive mechanism 7 provides power to rotate the rotating shaft 4. In this embodiment, the specific structural form of the base 6 can be referred to in the detailed description in the prior art, and will not be repeated here. In this embodiment, the drive mechanism 7 may include a geared motor, or a drive motor and a reducer. The geared motor is directly connected to the shaft end of the rotating shaft 4, or the reducer is connected between the drive motor and the shaft end of the rotating shaft 4 to drive the rotating shaft 4. The specific implementation of the drive mechanism 7 can also be referred to in the detailed description in the prior art, and will not be specifically limited in this embodiment.

[0082] Of course, the oligomer removal device provided in the embodiments of the present invention may also include other structures described in the prior art, such as a sealing flushing and lubrication system, see reference. Figure 1 As shown, the sealing flushing and lubrication system (not shown in the figure) allows sealing lubricant to enter and exit the shaft seal and bearing mechanism 3, achieving lubrication of the shaft seal and bearing mechanism 3 through the circulating flow of the sealing lubricant. For other specific implementations of the oligomer removal equipment, those skilled in the art can refer to the detailed descriptions in the prior art; therefore, specific limitations are not imposed in this embodiment of the invention.

[0083] In one embodiment, refer to Figure 2 or Figure 3 As shown, the isolation bushing assembly 501 includes an isolation seal 5011 and an auxiliary sealing seat 5012. The auxiliary sealing seat 5012 is fixed to the end cap 103 of the horizontal cylinder 1. The isolation seal 5011 is disposed in the area defined by the end cap 103 and the auxiliary sealing seat 5012, and is clearance-fitted with the rotating shaft 4. The isolation seal 5011 is clamped and fixed by the end cap 103 and the auxiliary sealing seat 5012 to prevent the isolation seal 5011 from shaking during operation, which would affect the isolation effect on particulate impurities. (Refer to...) Figure 2 or Figure 3 As shown, the rotary sealing assembly 502 includes an auxiliary sealing ring 5022 and a rotary sealing ring 5021 fixed to the rotating shaft 4; the auxiliary sealing ring 5022 is disposed on the rotary sealing ring 5021.

[0084] In this embodiment of the invention, in the second state, the rotary sealing ring 5021 and the auxiliary sealing seat 5012 are in a sealing engagement. Specifically, it can be as follows: Figure 2 and Figure 3 As shown, the auxiliary sealing seat 5012 has a groove 50121 at one end away from the isolation sealing member 5011. The rotating sealing ring 5021 has a boss 50211 on one side corresponding to the groove 50121. The inner diameter of the groove 50121 matches the outer diameter of the boss 50211. In the second working state, the inner side of the groove 50121 is in contact with the outer side of the boss 50211. Since the auxiliary sealing ring 5022 is disposed on the rotating sealing ring 5021, when the inner side of the groove 50121 is in contact with the outer side of the boss 50211, the auxiliary sealing ring 5022 is squeezed and undergoes elastic deformation, so that the outer side of the auxiliary sealing ring 5022 is tightly in contact with the inner side of the groove 50121, thereby ensuring the sealing effect between the rotating sealing ring 5021 and the auxiliary sealing seat 5012.

[0085] In one specific embodiment, refer to Figure 2 or Figure 3As shown, the end cap 103 of the horizontal cylindrical body 1 includes a flange 1031, and the auxiliary sealing seat 5012 is fixed to the flange 1031. Since the auxiliary sealing seat 5012 and the flange 1031 are generally made of metal, the isolation bushing assembly 501 may also include a gasket 5013, which is placed between the flange 1031 and the auxiliary sealing seat 5012 to ensure a sealing effect between them. Furthermore, the isolation bushing assembly 501 may also include an auxiliary sealing seat sealing ring 5014, which is placed between the inner wall of the flange 1031 and the outer wall of the auxiliary sealing seat 5012 to further ensure a sealing effect between them.

[0086] In one specific embodiment, refer to Figure 2 or Figure 3 As shown, the isolation bushing assembly 501 may further include a countersunk bolt 5015. The auxiliary sealing seat 5012 is provided with a through hole, through which the countersunk bolt 5015 passes to fasten the auxiliary sealing seat 5012 to the flange 1031. Furthermore, in order to ensure the seal at the through hole of the auxiliary sealing seat 5012, the isolation bushing assembly 501 may further include an anti-loosening washer 5016. The anti-loosening washer 5016 is placed between the through hole of the auxiliary sealing seat 5012 and the countersunk bolt 5015, which can both ensure the sealing effect between the two and prevent the countersunk bolt 5015 from loosening.

[0087] In one specific embodiment, the isolation seal 5011 of the isolation bushing assembly 501 can be a packing seal, a comb seal, a labyrinth seal, or a skeleton seal. The material of the isolation seal 5011 can be a non-metallic material, such as PEEK, PTFE, RPTFE, or ePTFE; or a metal material with good wear resistance and lubricity, such as brass. Of course, the isolation seal 5011 can also be made of other materials described in the prior art, as long as a clearance fit with the rotating shaft 4 is ensured to achieve the blocking effect on the particulate media inside the horizontal cylinder 1. Therefore, this embodiment of the invention does not impose specific limitations on this aspect.

[0088] In this embodiment of the invention, the dimensions of the isolation seal 5011, including the length of the isolation seal 5011, can be selected by those skilled in the art based on the composition of the internal medium of the horizontal cylinder 1 to adapt to the polycondensation reaction process of different media.

[0089] In one embodiment, refer to Figure 2 or Figure 3As shown, the rotary sealing assembly 502 also includes a shaft-side sealing ring 5023, which is disposed between the rotary sealing ring 5021 and the rotating shaft 4. Since both the rotary sealing ring 5021 and the rotating shaft 4 are generally made of metal, placing the shaft-side sealing ring 5023 between them ensures a good sealing effect.

[0090] In this embodiment of the invention, the materials of the auxiliary sealing ring 5022 and the axial sealing ring 5023 can be selected according to the temperature and physical properties of the medium inside the horizontal cylinder 1 of the oligomer removal equipment. For example, the materials can be nitrile rubber, fluororubber, silicone rubber, or perfluoroether rubber. Those skilled in the art can select the appropriate materials based on actual production needs, as long as the sealing effect is guaranteed. Therefore, this embodiment of the invention does not impose specific limitations on these materials.

[0091] In one specific embodiment, refer to Figure 2 or Figure 3 As shown, the rotary sealing assembly 502 may include a tapered set screw 5024, and the rotary sealing ring 5021 is provided with a through hole. The rotary sealing ring 5021 is fastened to the rotating shaft 4 by the tapered set screw 5024 passing through the through hole.

[0092] In one specific embodiment, in the shaft seal and bearing mechanism 3 described above, both the drive end bearing and the non-drive end bearing can be sliding bearings or rolling bearings. Regarding the specific structure of the bearing, those skilled in the art can select a suitable bearing structure based on actual production needs, comprehensively considering factors such as the weight, volume, and load of the oligomer removal equipment. For example, if the oligomer removal equipment is small in size, light in weight, and light in load, a rolling bearing capable of withstanding a certain axial force can be selected; while if the oligomer removal equipment is large in size, heavy in weight, and heavy in load, a sliding bearing can be selected.

[0093] In one specific embodiment, the shaft seal and bearing mechanism 3 can be a mechanical seal, a skeleton seal, or a labyrinth seal. Those skilled in the art can select the specific structural form of the shaft seal according to actual production needs, as long as it can achieve sealing of the horizontal cylinder 1. In this embodiment of the invention, the specific structural form of the shaft seal is not specifically limited.

[0094] In one specific embodiment, refer to Figure 1 As shown, the oligomer removal device also includes a shaft head nut 8; the shaft head nut 8 is screwed to the rotating shaft 4 and is adapted to abut against the shaft seal and bearing mechanism 3.

[0095] In this embodiment of the invention, in the first working state, the shaft head nut 8 is bolted to the rotating shaft 4 and abuts against the shaft seal and bearing mechanism 3. When maintenance or replacement of the shaft seal and bearing mechanism 3 is required, the oligomer removal equipment is stopped, the shaft head nut 8 is loosened, and the rotating shaft 4 can be moved axially. The rotary sealing ring 5021 moves with the rotating shaft 4. When the rotary sealing ring 5021 moves to the position of the auxiliary sealing seat 5012, the oligomer removal equipment is in the second working state, realizing the seal between it and the auxiliary sealing seat 5012, thereby achieving the sealing effect of the auxiliary seal.

[0096] In this embodiment of the invention, when maintenance or replacement of the shaft seal and bearing mechanism 3 is required, the drive mechanism 7 can be removed first, and then the shaft head nut 8 can be loosened, so that the rotating shaft 4 is in a movable state. Then, refer to... Figure 4 As shown, the rotating shaft 4 is moved axially using a pre-configured shaft push-pull mechanism 9. (Refer to...) Figure 5 As shown, the shaft push-pull mechanism 9 includes a leg 901, a leg support frame 902, a flange support frame 903, a flange component 904, and a thrust bolt 905. The leg 901 is fixedly connected to the leg support frame 902 and is adapted to be fixed to the end cap 103 of the horizontal cylindrical body 1 of the oligomer removal equipment. The leg support frame 902 is detachably connected to the flange support frame 903. The flange support frame 903 is fixedly connected to the flange component 904. The flange component 904 is screwed to the thrust bolt 905. The thrust bolt 905 is adapted to rotate within the flange component 904 to switch the oligomer removal equipment from a first working state to a second working state. In use, the support leg 901 and the support leg support frame 902 are first fixed to the end cover 103 of the horizontal cylinder 1 of the oligomer removal equipment. Then, the flange support frame 903 is fixed to the support leg support frame 902 by fastener 906. The fastener 906 can adopt the fastening method in the prior art, such as bolts and nuts. Finally, the rotating shaft 4 is moved by rotating the thrust bolt 905, so that the oligomer removal equipment is switched from the first working state to the second working state.

[0097] Example 2

[0098] Based on the same inventive concept, embodiments of the present invention also provide a system for online replacement of shaft seals and bearings, see reference. Figure 4 and Figure 5 As shown, it includes the oligomer removal device and shaft push-pull mechanism 9 described in Embodiment 1 above; wherein:

[0099] The shaft push-pull mechanism 9 includes a leg 901, a leg support frame 902, a flange support frame 903, a flange component 904, and a thrust bolt 905;

[0100] The support leg 901 is fixedly connected to the support leg support frame 902, and the support leg 901 is adapted to be fixed to the end cap 103 of the horizontal cylinder 1 of the oligomer removal equipment; the support leg support frame 902 is detachably connected to the flange support frame 903; the flange support frame 903 is fixedly connected to the flange component 904; the flange component 904 is screwed to the thrust bolt 905;

[0101] The thrust bolt 905 is adapted to rotate within the flange member 904 to switch the oligomer removal device from a first working state to a second working state.

[0102] The specific implementation of the online replacement system for shaft seals and bearings provided in this embodiment of the invention can be referred to the detailed description of the oligomer removal equipment in Embodiment 1 above. Of course, in the implementation process, those skilled in the art can also refer to the detailed description in the prior art. Where there are repetitions, they will not be repeated.

[0103] Example 3

[0104] Based on the same inventive concept, this invention also provides a polyester apparatus system, including the oligomer removal equipment, spray cooling equipment, and vacuum equipment described in Embodiment 1 above;

[0105] The spray cooling device is connected to the spray cooling interface of the oligomer removal device, and the vacuuming device is connected to the vacuuming interface of the oligomer removal device.

[0106] The specific implementation of the polyester apparatus system provided in this embodiment of the invention can be referred to the detailed description of the oligomer removal equipment in Embodiment 1 above. Repeated descriptions will not be repeated. The specific structure and implementation of the spray cooling equipment and vacuum equipment described above can also be found in the detailed descriptions in the prior art by those skilled in the art. Therefore, this embodiment of the invention does not impose specific limitations on these aspects.

[0107] Example 4

[0108] Based on the same inventive concept, this invention also provides a method for online replacement of the shaft seal and bearing of an oligomer removal device, applicable to the polyester device system provided in Embodiment 3 of this invention, including:

[0109] Stop the rotation of the shaft 4 of the oligomer removal device, and push the shaft 4 to move axially, so that the oligomer removal device switches from the first working state to the second working state;

[0110] In the second working state, the spray cooling equipment and the vacuum equipment are kept running, so that the isolation bushing assembly 501 and the rotary sealing assembly 502 are in contact, and the horizontal cylinder 1 of the oligomer removal equipment is auxiliaryly sealed under atmospheric pressure.

[0111] Perform online replacement of shaft seals and / or bearings in the shaft seal and bearing mechanism.

[0112] The specific implementation of the method for online replacement of shaft seals and bearings of the oligomer removal device provided in this embodiment of the invention can refer to the detailed description of the oligomer removal device in Embodiment 1 above. Repeated descriptions will not be repeated. The specific structure and implementation of the spray cooling device and vacuuming device described above can also be found in the detailed descriptions in the prior art by those skilled in the art; therefore, this embodiment of the invention does not impose specific limitations on these aspects.

[0113] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. The terms "upper," "lower," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0114] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on its differences from other embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. This invention is not limited to any single aspect, nor to any single embodiment, nor to any combination and / or substitution of these aspects and / or embodiments. Each aspect and / or embodiment of this invention can be used alone, or in combination with one or more other aspects and / or other embodiments.

[0115] Finally, it should be noted that the above-described embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit it. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An oligomer removal device, characterized in that, It includes a horizontal cylinder, a vertical cylinder, a shaft seal and bearing mechanism, a rotating shaft, and an auxiliary sealing mechanism; The horizontal cylinder is connected to the vertical cylinder. The horizontal cylinder is provided with a discharge port and a vacuum interface, and the vertical cylinder is provided with a feed port and a spray cooling interface. The horizontal cylinder is equipped with a scraper, which is fixed to the rotating shaft by connecting vertical ribs, so that it can rotate with the rotating shaft when the rotating shaft rotates, thereby scraping off the oligomers on the inner wall of the horizontal cylinder. The shaft seal and bearing mechanism are fixed to the outer walls of the two end caps of the horizontal cylinder; the rotating shaft passes through the horizontal cylinder and its two ends are respectively matched with the shaft seal and bearing mechanism; The auxiliary sealing mechanism is disposed in the accommodating space between the shaft seal and bearing mechanism and the end cover; The auxiliary sealing mechanism includes an isolation bushing assembly and a rotary sealing assembly; The isolation bushing assembly is fixed to the end cap and has a clearance fit with the rotating shaft to block particulate impurities inside the horizontal cylinder; the rotary sealing assembly is fixed to the rotating shaft. In the first working state, there is a preset distance between the isolation bushing assembly and the rotary sealing assembly; the first working state is when the rotating shaft rotates normally, driving the scraper to rotate, thereby scraping off the oligomers from the inner wall of the horizontal cylinder. In the second working state, the isolation bushing assembly and the rotary sealing assembly are fitted together, and the position of the rotating shaft is kept fixed under atmospheric pressure to provide auxiliary sealing for the horizontal cylinder. The second working state is the working state in which the rotating shaft is moved forward or backward along the axial direction to fit together with the isolation bushing assembly and the rotary sealing assembly.

2. The oligomer removal device as described in claim 1, characterized in that, The isolation bushing assembly includes an isolation seal and an auxiliary seal seat. The auxiliary seal seat is fixed to the end cap, and the isolation seal is disposed in the area defined by the end cap and the auxiliary seal seat, and is clearance-fitted with the rotating shaft. The rotary sealing assembly includes an auxiliary sealing ring and a rotary sealing ring fixed to the rotating shaft; the auxiliary sealing ring is disposed on the rotary sealing ring, and in the second state, the rotary sealing ring is in sealing engagement with the auxiliary sealing seat.

3. The oligomer removal device as described in claim 2, characterized in that, The auxiliary sealing seat has a groove at one end away from the isolation sealing element, and the rotating sealing ring has a boss on one side corresponding to the groove, with the inner diameter of the groove matching the outer diameter of the boss.

4. The oligomer removal device as described in claim 3, characterized in that, The end cap includes a flange, and the auxiliary sealing seat is fixed to the flange; The isolation bushing assembly also includes a gasket positioned between the flange and the auxiliary sealing seat.

5. The oligomer removal device as described in claim 4, characterized in that, The isolation bushing assembly also includes an auxiliary sealing seat sealing ring, which is positioned between the inner wall of the flange and the outer wall of the auxiliary sealing seat.

6. The oligomer removal device as described in claim 4, characterized in that, The rotary sealing assembly further includes a shaft-side sealing ring, which is disposed between the rotary sealing ring and the rotating shaft.

7. The oligomer removal device as described in claim 4, characterized in that, The bearings in the shaft seal and bearing mechanism can be sliding bearings or rolling bearings.

8. The oligomer removal device as described in claim 4, characterized in that, The shaft seal is a mechanical seal mechanism, a skeleton seal mechanism, or a labyrinth seal mechanism.

9. The oligomer removal device as described in claim 4, characterized in that, The isolation seal is a packing seal, a comb seal, a labyrinth seal, or a skeleton seal.

10. The oligomer removal device as described in claim 9, characterized in that, The material of the isolation seal is at least one of PEEK, PTFE, RPTFE, ePTFE and brass.

11. A tooling system for online replacement of shaft seals and bearings, characterized in that, Includes a shaft push-pull mechanism and an oligomer removal device as described in any one of claims 1-10; wherein: The shaft system push-pull mechanism includes a leg, a leg support frame, a flange support frame, a flange component, and a thrust bolt; The support leg is fixedly connected to the support leg support frame, and the support leg is adapted to be fixed to the end cap of the horizontal cylinder of the oligomer removal equipment; the support leg support frame is detachably connected to the flange support frame; the flange support frame is fixedly connected to the flange component; the flange component is screwed to the thrust bolt. The thrust bolt is adapted to rotate within the flange component to switch the oligomer removal device from a first operating state to a second operating state.

12. A polyester apparatus system comprising a spray cooling device, a vacuum device, and an oligomer removal device as described in any one of claims 1-10; The spray cooling device is connected to the spray cooling interface of the oligomer removal device, and the vacuuming device is connected to the vacuuming interface of the oligomer removal device.

13. A method for online replacement of shaft seals and bearings of an oligomer removal device, applicable to the polyester plant system as described in claim 12, characterized in that, include: Stop the rotation of the shaft of the oligomer removal device, and push the shaft to move axially to switch the oligomer removal device from the first working state to the second working state; In the second working state, the spray cooling equipment and vacuum equipment are kept running to make the isolation bushing assembly and the rotary sealing assembly fit together, and the position of the rotating shaft is kept fixed under atmospheric pressure, thereby achieving auxiliary sealing of the horizontal cylinder of the oligomer removal equipment. Perform online replacement of shaft seals and / or bearings in the shaft seal and bearing mechanism.

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