Vacuum pipeline online flushing device for polyester melt production

Abstract

The utility model relates to the technical field of polyester production, and discloses a vacuum pipeline online flushing device for polyester melt production, which comprises a vacuum pipeline, a first connecting flange arranged outside the vacuum pipeline, a second connecting flange arranged on the outer side of the first connecting flange, and a spray pipe arranged outside the second connecting flange, a spray head is arranged outside the spray pipe, two fixing mechanisms used for improving the connecting tightness between the first connecting flange and the second connecting flange are arranged on the outer side of the vacuum pipeline, and a dismounting and mounting mechanism used for replacing the spray head is arranged on the inner side of the spray pipe. When the spray head is used, a user can replace the spray head through the dismounting mechanism, and then the connecting tightness between the first connecting flange and the second connecting flange can be improved through the fixing mechanism, so that the effect that the user can conveniently dismount the spray head is achieved, and the use convenience is improved; and the connection tightness between the sliding block and the screw rod can be improved through the spring, and the problem that the sliding block is loosened is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of polyester production, and in particular to an online flushing device for vacuum pipelines in polyester melt production. Background Art

[0002] Polyester melt refers to a substance in which polyester resin is melted into a liquid state under high temperature conditions. Polyester resin is an important synthetic resin with good mechanical properties, chemical resistance and heat resistance. It is widely used in plastic products, fibers, coatings and other fields. During the production of existing polyester melts, a vacuum system is required because some reaction processes need to be carried out under a vacuum state. The vacuum pipe is generally connected between reactors or between the reactor and the vacuum generation system. Due to the strong negative pressure of the vacuum system, the small molecular products in the reactor are sucked out of the reactor and attached to the inner wall of the vacuum pipe. The vacuum pipe needs to be flushed for subsequent use.

[0003] The Chinese utility model patent with application number 201220173320.3 discloses an online flushing device for polycondensation vacuum pipelines of a three-kettle polyester device, which is composed of a high-temperature EG flushing pipeline connection system and a polycondensation vacuum pipeline nozzle system. The high-temperature EG flushing pipeline connection system connects the outlet of the high-temperature EG circulation pump in the three-kettle polyester device and the polycondensation vacuum pipeline nozzle system. The utility model uses the high-temperature EG of 150-200°C in the polyester device to be transported to the high-temperature EG flushing pipeline connection system through the outlet pipeline of the high-temperature EG circulation pump, and performs hot flushing on the vacuum pipeline through the spiral packing sealing nozzle, so that the large and small molecular products entrained and extracted by the polycondensation reaction EG steam are alcoholized and dropped. The utility model device has low investment cost, simple operation, short process and good effect. It can effectively flush the large and small molecular products and scaling inside the vacuum pipeline, effectively deal with and prevent blockage and emergency shutdown of the device, fundamentally extend the operation time of the device, and reduce the probability and cost of unplanned shutdown.

[0004] However, the above technical solution is to fix the spray gun by flange bolts, and the force generated by the spray gun during high-pressure jet flushing can easily loosen the bolts, causing the spray gun to shake and affecting the sealing of the connection, causing leakage. In addition, since the nozzle on the spray gun is in the condensation vacuum pipeline for a long time and often needs to work, it is easily corroded and worn, with a high damage rate, so it often needs to be replaced, and the cumbersome and complicated operation greatly affects work efficiency and is very inconvenient to use. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide an online flushing device for vacuum pipelines for polyester melt production, so as to solve the problem that the above-mentioned technical scheme in the prior art is that the spray gun is fixed by flange bolts, and the force generated by the spray gun during high-pressure spray flushing can easily loosen the bolts, thereby causing the spray gun to shake, and affecting the sealing of the connection, causing leakage. In addition, since the nozzle on the spray gun is in the polycondensation vacuum pipeline for a long time and often needs to work, it is easily corroded and worn, and has a high damage rate. Therefore, it often needs to be replaced, and the cumbersome and complicated operation greatly affects the work efficiency and is very inconvenient to use.

[0006] The utility model provides the following technical scheme: an online flushing device for vacuum pipelines in polyester melt production, comprising a vacuum pipeline, a first connecting flange is arranged outside the vacuum pipeline, a second connecting flange is arranged outside the first connecting flange, a nozzle is arranged outside the second connecting flange, a nozzle for flushing the vacuum pipeline is arranged outside the nozzle, two fixing mechanisms for improving the tightness of the connection between the first connecting flange and the second connecting flange are arranged outside the vacuum pipeline, and a disassembly mechanism for replacing the nozzle is arranged inside the nozzle.

[0007] As a preferred embodiment of the above technical solution, the first connecting flange is connected to the second connecting flange by a plurality of bolts and nuts.

[0008] As a preferred embodiment of the above technical solution, the two fixing mechanisms are both arranged on the outside of the vacuum pipe, and the two fixing mechanisms are symmetrically distributed, and the specifications and dimensions of the two fixing mechanisms are the same.

[0009] As a preferred embodiment of the above technical solution, the fixing mechanism includes a base fixedly connected to the outside of the vacuum pipe, a limiting rod is fixedly connected to the inner side of the base, a slider is axially slidably connected to the outside of the limiting rod, a spring is fixedly connected to the outside of the slider, and a screw is also threadedly connected to the outside of the slider, a handle is fixedly connected to the end of the screw away from the slider, a support plate is fixedly connected to the side of the slider away from the spring, and a pressure plate is fixedly connected to the bottom of the support plate. The user can insert the nozzle into the vacuum pipe, and then install the nozzle in the vacuum pipe through the first connecting flange, the second connecting flange and a plurality of bolts. Then the user can rotate the handles on the outside of the two fixing mechanisms. The rotation of the handle drives the screw to rotate, and the rotation of the screw drives the slider to move through the limiting rod. The movement of the slider will drive the support plate and the pressure plate to move and squeeze the spring. When the pressure plate moves to a certain position, it will squeeze the second connecting flange, thereby improving the tightness of the connection between the first connecting flange and the second connecting flange.

[0010] As a preferred embodiment of the above technical solution, both ends of the limit rod are fixedly connected to the inner side of the base, one end of the screw is rotatably connected to the inner side of the base through a bearing and the other end of the screw passes through the base and is fixedly connected to the handle, one end of the spring away from the slider is fixedly connected to the inner side of the base, and the spring is distributed on the outer side of the limit rod, and the pressure plate is positioned between two adjacent bolts on the second connecting flange.

[0011] As a preferred embodiment of the above technical solution, the disassembly and assembly mechanism includes a card slot provided on the inner side of the nozzle and a sealing ring arranged on the outer side of the nozzle, the inner side of the card slot is fixedly connected with four positioning rods distributed at equal angles, the outer side of the positioning rod is plugged with a socket, the outer side of the socket is fixedly connected with a positioning ring, the top of the positioning ring is fixedly connected with a nozzle, the outer side of the nozzle close to the positioning ring is provided with a first external thread, the outer side of the nozzle close to the card slot is provided with a second external thread, the outer side of the second external thread is connected with an internal thread, the outer side of the internal thread is fixedly connected with a sleeve, and the nozzle The end of the tube away from the nozzle is connected to a connecting tube for conveying flushing liquid. The user can convey the flushing liquid into the nozzle through the connecting tube, and then spray it out through the nozzle, thereby flushing the vacuum pipe. The user can insert the positioning ring at the bottom of the nozzle into the groove inside the nozzle, and connect the socket on the positioning ring with the positioning rod in the groove. The user can then rotate the sleeve, and the sleeve will fix the nozzle and the nozzle under the cooperation of the internal thread on the inner side thereof, the first external thread on the nozzle, and the second external thread on the nozzle, thereby connecting the nozzle and the nozzle.

[0012] As a preferred embodiment of the above technical solution, the nozzle consists of two thick circular tubes and one thin circular tube, the two thick circular tubes are connected to the thin circular tube, the left thick circular tube is connected to the connecting tube, the diameter of the thin circular tube is smaller than the sleeve, and the sealing ring is arranged on the outside of the thin circular tube, the second external thread and the groove are distributed on the right thick circular tube, the size of the positioning ring matches the groove, the number of the jacks is the same as the positioning rod, four jacks are all opened on the positioning ring, and the positions of the four jacks correspond to the four positioning rods, the specification size of the first external thread is the same as the second external thread, and the specification of the internal thread matches the first external thread and the second external thread.

[0013] As a preferred embodiment of the above technical solution, when it is necessary to further improve the connection sealing between the sleeve, the nozzle and the nozzle, the user can wrap the raw tape around the first external thread and the second external thread to achieve the connection sealing between the sleeve, the nozzle and the nozzle.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The utility model is provided with a vacuum pipeline, a fixing mechanism, and a disassembling mechanism. When in use, the user can insert the positioning ring at the bottom of the nozzle into the card slot inside the nozzle pipe, and the insertion hole on the positioning ring is plugged into the positioning rod in the card slot. Then the user can rotate the sleeve, and the sleeve will fix the nozzle and the nozzle pipe under the cooperation of the internal thread inside the sleeve and the first external thread on the nozzle and the second external thread on the nozzle pipe, so that the nozzle and the nozzle pipe are connected. Then the user can insert the nozzle into the vacuum pipeline, and then install the nozzle in the vacuum pipeline through the first connecting flange, the second connecting flange and a plurality of bolts. Then the user can rotate the two The handle on the outside of the fixing mechanism rotates to drive the screw to rotate, and the rotation of the screw drives the slider to move through the limit rod. The movement of the slider will drive the support plate and the pressure plate to move and squeeze the spring. When the pressure plate moves to a certain position, it will squeeze the second connecting flange, thereby improving the tightness of the connection between the first connecting flange and the second connecting flange, so as to achieve the effect of facilitating the user to disassemble the nozzle, thereby improving the convenience of use. The spring on the outside of the slider will improve the tightness of the connection between the slider and the screw, thereby avoiding the slider from loosening after long-term vibration, thereby affecting the tightness of the connection between the nozzle and the vacuum pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a first-person perspective stereogram of a vacuum pipeline online flushing device for polyester melt production;

[0017] Figure 2 It is a cross-sectional view from the first perspective of a vacuum pipeline online flushing device for polyester melt production;

[0018] Figure 3 A cross-sectional view from a second perspective of a vacuum pipeline online flushing device for polyester melt production;

[0019] Figure 4 for Figure 3 A schematic diagram of the structure enlargement in the middle;

[0020] Figure 5 for Figure 3 Enlarged schematic diagram of the structure at point B in the middle.

[0021] In the figure: 1. vacuum pipe; 11. base; 12. limit rod; 13. slider; 14. spring; 15. screw; 16. handle; 17. support plate; 18. pressure plate; 2. first connecting flange; 3. second connecting flange; 4. nozzle; 41. slot; 42. sealing ring; 43. positioning rod; 44. socket; 45. positioning ring; 46. first external thread; 47. second external thread; 48. internal thread; 49. sleeve; 5. nozzle. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0023] Embodiment 1

[0024] like Figure 1 , Figure 2 and Figure 3 As shown, the utility model provides a technical solution: an online flushing device for vacuum pipelines in polyester melt production, comprising a vacuum pipeline 1, a first connecting flange 2 is arranged outside the vacuum pipeline 1, a second connecting flange 3 is arranged outside the first connecting flange 2, a nozzle 4 is arranged outside the second connecting flange 3, a nozzle 5 for flushing the vacuum pipeline 1 is arranged outside the nozzle 4, two fixing mechanisms for improving the tightness of the connection between the first connecting flange 2 and the second connecting flange 3 are arranged outside the vacuum pipeline 1, a disassembly mechanism for replacing the nozzle 5 is arranged inside the nozzle 4, and the first connecting flange 2 is connected to the second connecting flange 3 by a plurality of bolts and nuts.

[0025] like Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, the two fixing mechanisms are both arranged on the outside of the vacuum pipe 1, and the two fixing mechanisms are symmetrically distributed. The specifications and sizes of the two fixing mechanisms are the same. The fixing mechanisms include a base 11 fixedly connected to the outside of the vacuum pipe 1, a limit rod 12 fixedly connected to the inner side of the base 11, a slider 13 axially slidably connected to the outside of the limit rod 12, a spring 14 fixedly connected to the outside of the slider 13, a screw 15 threadedly connected to the outside of the slider 13, a handle 16 fixedly connected to the end of the screw 15 away from the slider 13, and a handle 16 fixedly connected to the end of the slider 13 away from the slider 13. One side of the spring 14 is fixedly connected to a support plate 17, and the bottom of the support plate 17 is fixedly connected to a pressure plate 18. Both ends of the limit rod 12 are fixedly connected to the inner side of the base 11. One end of the screw rod 15 is rotatably connected to the inner side of the base 11 through a bearing, and the other end of the screw rod 15 passes through the base 11 and is fixedly connected to the handle 16. One end of the spring 14 away from the slider 13 is fixedly connected to the inner side of the base 11, and the spring 14 is distributed on the outer side of the limit rod 12. The pressure plate 18 is located between two adjacent bolts on the second connecting flange 3.

[0026] By setting the above-mentioned mechanism, when in use, the user can insert the nozzle 4 into the vacuum pipe 1, and then install the nozzle 4 in the vacuum pipe 1 through the first connecting flange 2, the second connecting flange 3 and a plurality of bolts. Then the user can rotate the handle 16 on the outside of the two fixing mechanisms. The rotation of the handle 16 drives the screw 15 to rotate. The rotation of the screw 15 drives the slider 13 to move through the limit rod 12. The movement of the slider 13 drives the support plate 17 and the pressure plate 18 to move and squeeze the spring 14. The pressure plate 18 moves to a certain position to squeeze the second connecting flange 3, thereby improving the connection tightness between the first connecting flange 2 and the second connecting flange 3, and the spring 14 on the outside of the slider 13 improves the connection tightness between the slider 13 and the screw 15, thereby avoiding the problem of the slider 13 loosening after being subjected to long-term vibration.

[0027] Embodiment 2

[0028] like Figure 1 , Figure 2 and Figure 3 As shown, Figure 2 , Figure 3 and Figure 4 As shown, an online flushing device for vacuum pipelines in polyester melt production comprises a vacuum pipeline 1, a first connecting flange 2 is arranged outside the vacuum pipeline 1, a second connecting flange 3 is arranged outside the first connecting flange 2, a nozzle 4 is arranged outside the second connecting flange 3, a nozzle 5 for flushing the vacuum pipeline 1 is arranged outside the nozzle 4, two fixing mechanisms for improving the tightness of the connection between the first connecting flange 2 and the second connecting flange 3 are arranged outside the vacuum pipeline 1, a disassembly and assembly mechanism for replacing the nozzle 5 is arranged inside the nozzle 4, and the first connecting flange 2 is connected to the second connecting flange 3 by a plurality of bolts and nuts.

[0029] like Figure 2 , Figure 3 and Figure 4As shown, the disassembly and assembly mechanism includes a slot 41 provided on the inner side of the nozzle 4 and a sealing ring 42 provided on the outer side of the nozzle 4. The sealing ring 42 can improve the connection sealing performance between the nozzle 4 and the vacuum pipe 1. Four positioning rods 43 distributed at equal angles are fixedly connected to the inner side of the slot 41. A plug hole 44 is inserted on the outer side of the positioning rod 43. A positioning ring 45 is fixedly connected to the outer side of the plug hole 44. A nozzle 5 is fixedly connected to the top of the positioning ring 45. A first external thread 46 is provided on the outer side of one end of the nozzle 5 close to the positioning ring 45. A second external thread 47 is provided on the outer side of one end of the nozzle 4 close to the slot 41. An internal thread 48 is connected to the outer thread of the second external thread 47. A sleeve 49 is fixedly connected to the outer side of the internal thread 48. A connecting pipe for conveying flushing liquid is connected to the end of the nozzle 4 far from the nozzle 5. The user can transport the flushing liquid into the nozzle 4 through the connecting pipe, and then spray it out through the nozzle 5, so as to flush the vacuum pipe 1. The nozzle 4 is composed of two thick round tubes and one thin round tube. The two thick round tubes are connected to the thin round tube. The left thick round tube is connected to the connecting pipe. The diameter of the thin round tube is smaller than the sleeve 49, and the sealing ring 42 is arranged on the outside of the thin round tube. The second external thread 47 and the groove 41 are distributed on the right thick round tube. The size of the positioning ring 45 matches the groove 41. The number of the jacks 44 is the same as the positioning rod 43. The four jacks 44 are all opened on the positioning ring 45, and the positions of the four jacks 44 correspond to the four positioning rods 43. The specification size of the first external thread 46 is the same as the second external thread 47, and the specification of the internal thread 48 matches the first external thread 46 and the second external thread 47.

[0030] By setting the above-mentioned mechanism, when in use, the user can insert the positioning ring 45 at the bottom of the nozzle 5 into the slot 41 inside the nozzle 4, and the insertion hole 44 on the positioning ring 45 is plugged into the positioning rod 43 in the slot 41. Then the user can rotate the sleeve 49, and the sleeve 49 will fix the position of the nozzle 5 with the cooperation of the internal thread 48 on the inner side thereof and the first external thread 46 on the nozzle 5 and the second external thread 47 on the nozzle 4, so that the nozzle 5 is connected to the nozzle 4. When disassembly is required, the user can rotate the sleeve 49 in the opposite direction, and the sleeve 49 will gradually separate from the first external thread 46 on the nozzle 5 and the second external thread 47 on the nozzle 4 and move to the thin round tube. The user takes out the positioning ring 45 at the bottom of the nozzle 5 from the slot 41 to complete the disassembly of the nozzle 5.

[0031] The above embodiments are only used to illustrate the technical solution of the present invention, but not to limit it.

Claims

1. A vacuum pipeline online flushing device for polyester melt production, comprising a vacuum pipeline (1), characterized in that: A first connecting flange (2) is arranged outside the vacuum pipe (1), a second connecting flange (3) is arranged outside the first connecting flange (2), a nozzle (4) is arranged outside the second connecting flange (3), a nozzle (5) for flushing the vacuum pipe (1) is arranged outside the nozzle (4), two fixing mechanisms for improving the tightness of the connection between the first connecting flange (2) and the second connecting flange (3) are arranged outside the vacuum pipe (1), and a disassembly mechanism for replacing the nozzle (5) is arranged inside the nozzle (4).

2. The vacuum pipeline online flushing device for polyester melt production according to claim 1, characterized in that: The first connecting flange (2) is connected to the second connecting flange (3) via a plurality of bolts and nuts.

3. The vacuum pipeline online flushing device for polyester melt production according to claim 1, characterized in that: The two fixing mechanisms are both arranged on the outside of the vacuum pipe (1), and the two fixing mechanisms are symmetrically distributed, and the specifications and dimensions of the two fixing mechanisms are the same.

4. The vacuum pipeline online flushing device for polyester melt production according to claim 1, characterized in that: The fixing mechanism comprises a base (11) fixedly connected to the outside of the vacuum pipe (1), a limiting rod (12) fixedly connected to the inner side of the base (11), a slider (13) axially slidably connected to the outside of the limiting rod (12), a spring (14) fixedly connected to the outside of the slider (13), a screw (15) threadedly connected to the outside of the slider (13), a handle (16) fixedly connected to one end of the screw (15) away from the slider (13), a support plate (17) fixedly connected to the side of the slider (13) away from the spring (14), and a pressure plate (18) fixedly connected to the bottom of the support plate (17).

5. The vacuum pipeline online flushing device for polyester melt production according to claim 4, characterized in that: Both ends of the limit rod (12) are fixedly connected to the inner side of the base (11), one end of the screw rod (15) is rotatably connected to the inner side of the base (11) through a bearing, and the other end of the screw rod (15) passes through the base (11) and is fixedly connected to the handle (16), one end of the spring (14) away from the slider (13) is fixedly connected to the inner side of the base (11), and the spring (14) is distributed on the outer side of the limit rod (12), and the pressure plate (18) is located between two adjacent bolts on the second connecting flange (3).

6. The vacuum pipeline online flushing device for polyester melt production according to claim 1, characterized in that: The disassembly and assembly mechanism comprises a slot (41) provided on the inner side of the nozzle (4) and a sealing ring (42) arranged on the outer side of the nozzle (4); the inner side of the slot (41) is fixedly connected with four positioning rods (43) distributed at equal angles; the outer side of the positioning rod (43) is plugged with a socket (44); the outer side of the socket (44) is fixedly connected with a positioning ring (45); the top of the positioning ring (45) is fixedly connected with a nozzle (5); the outer side of one end of the nozzle (5) close to the positioning ring (45) is provided with a first external thread (46); the outer side of one end of the nozzle (4) close to the slot (41) is provided with a second external thread (47); the outer thread of the second external thread (47) is connected with an internal thread (48); the outer side of the internal thread (48) is fixedly connected with a sleeve (49); the end of the nozzle (4) away from the nozzle (5) is connected with a connecting pipe for conveying flushing liquid.

7. The vacuum pipeline online flushing device for polyester melt production according to claim 6, characterized in that: The nozzle (4) is composed of two thick round tubes and one thin round tube. The two thick round tubes are connected to the thin round tube. The thick round tube on the left is connected to the connecting tube. The diameter of the thin round tube is smaller than the sleeve (49). The sealing ring (42) is arranged on the outside of the thin round tube. The second external thread (47) and the clamping groove (41) are both distributed on the right thick round tube. The size of the positioning ring (45) matches the clamping groove (41). The number of the plug holes (44) is the same as that of the positioning rod (43). The four plug holes (44) are all arranged on the positioning ring (45). The positions of the four plug holes (44) correspond to the four positioning rods (43). The specification size of the first external thread (46) is the same as that of the second external thread (47). The specification of the internal thread (48) matches that of the first external thread (46) and the second external thread (47).

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