Vacuum system cleaning device and polyester film production apparatus

Abstract

The utility model discloses a kind of vacuum system cleaning device and polyester film production equipment, it is related to polyester film production equipment technical field, and wherein, vacuum system cleaning device includes condensate import pipeline, scraper condenser and vacuum unit, scraper condenser includes cylinder and spray assembly, cylinder is equipped with condensation cavity, spray assembly includes nozzle assembly and sealing assembly, nozzle assembly includes spray branch pipe, nozzle, liquid inlet flange and mounting flange, the inner end of spray branch pipe is inserted into condensation cavity, and nozzle is installed, sealing assembly includes the fixed flange, split ball valve and packing flange connected in sequence, spray assembly further includes limiting assembly, limiting assembly includes connecting piece and limiting piece, when nozzle moves to packing flange, mounting flange can be limited by limiting piece in limiting position Limiting constraint.The technical scheme provided by the utility model can keep vacuum state for vacuum system, production line does not stop production, and improve the dismounting convenience of nozzle.

Description

Technical Field

[0001] This utility model relates to the technical field of polyester film production equipment, and in particular to a vacuum system cleaning device and polyester film production equipment. Background Technology

[0002] Polyester film, or PET film, is a transparent plastic film made of polyethylene terephthalate (PET). Its production process utilizes a polycondensation unit. During the polycondensation reaction, ethylene glycol molecules are released, existing in a gaseous form within the reactor. To ensure the polycondensation reaction continues, this ethylene glycol vapor must be removed promptly. A vacuum system is used to extract the ethylene glycol vapor from the reactor, increasing the vacuum level inside the reactor and thus promoting polymer chain growth and increasing the degree of polymerization.

[0003] When ethylene glycol vapor is rapidly extracted from the reactor, oligomers inside the reactor are carried away by the vapor and enter the vacuum system. Condensed ethylene glycol, sprayed through nozzles on the scraped condenser, condenses the extracted vapor. The condensed glycol is then collected in a hot well at the bottom of the scraped condenser for recycling. Non-condensable gases are continuously extracted by the vacuum unit, simultaneously capturing the oligomers carried by the ethylene glycol vapor, thus achieving online cleaning of the vacuum system.

[0004] Among them, nozzles, as important components of spray towers, are prone to clogging if they are not cleaned in a timely manner after prolonged use. On the one hand, how to prevent air from entering the scraper condenser during nozzle disassembly to maintain the vacuum system and ensure uninterrupted production; on the other hand, how to improve the ease of nozzle disassembly are both technical problems that urgently need to be solved in this field. Utility Model Content

[0005] The main objective of this invention is to provide a vacuum system cleaning device and a polyester film production equipment, aiming to solve at least one of the aforementioned technical problems.

[0006] To achieve the above objectives, the present invention proposes a vacuum system cleaning device, comprising a condensate inlet pipeline, a scraper condenser, and a vacuum unit, wherein the scraper condenser comprises:

[0007] The cylindrical body includes a condensation chamber. The side wall of the cylindrical body has mounting holes communicating with the condensation chamber, and the top wall of the cylindrical body has a vacuum extraction port communicating with the condensation chamber. The vacuum extraction port is connected to the vacuum unit.

[0008] A spray assembly includes a nozzle assembly, a sealing assembly, and a limiting assembly. The nozzle assembly includes a spray branch pipe, a nozzle, an inlet flange, a mounting flange, and an inlet valve. The inner end of the spray branch pipe extends into the condensation chamber and is fitted with the nozzle. The outer end of the spray branch pipe is connected to the inlet flange via the inlet valve. The inlet flange is detachably connected to the condensate inlet pipeline. The sealing assembly includes a fixed flange, a split ball valve, and a packing flange connected in sequence. The split ball valve is installed on the cylinder through the fixed flange and communicates with the mounting hole. The packing flange has a sealing structure inside, and the mounting flange is detachably connected to the packing flange.

[0009] The limiting assembly includes a connector and a limiting member. The limiting member is movable on the connector in a direction intersecting the installation direction of the nozzle assembly and has a limiting position and a releasing position. When the nozzle moves to the packing flange, the mounting flange is limited and constrained by the limiting member in the limiting position. After the limiting member switches to the releasing position, the inner end of the spray branch pipe can freely exit the packing flange.

[0010] In one embodiment, the limiting component further includes an elastic reset member, whose elastic potential energy increases as the limiting member moves from the limiting position toward the releasing position.

[0011] In one embodiment, the limiting member includes a limiting part, a telescopic part, and a mounting part distributed and connected in sequence along a first direction. The telescopic part is movably inserted through the connecting member. The mounting part and the limiting part are located on opposite sides of the connecting member, and the limiting part is located close to the spray branch pipe. The elastic reset member is connected between the mounting part and the connecting member.

[0012] In one embodiment, at the restricted position, the limiting portion abuts against the end face of the mounting flange away from the packing flange to restrict the spray branch pipe from exiting the packing flange.

[0013] In one embodiment, the limiting portion has a limiting side and a guide side opposite to each other in the installation direction of the nozzle assembly. The limiting side is disposed near the packing flange, and the guide side extends obliquely towards the spray branch pipe in the direction near the packing flange. During the insertion of the spray branch pipe into the sealing assembly, the outer periphery of the mounting flange slides against the guide side.

[0014] In one embodiment, the guide side is configured as a convex arc surface.

[0015] In one embodiment, the inlet valve is configured as a gate valve, and the axis of the handwheel of the gate valve is perpendicular to the first direction.

[0016] In one embodiment, the elastic reset member is configured as a compression spring, one end of which is welded and fixed to the mounting portion, and the other end of which is welded and fixed to the connector.

[0017] In one embodiment, the connector includes intersecting and connected connecting lugs and a connecting rod, the connecting lugs being fixed to the circumferential side of the packing flange, the connecting rod extending from the connecting lugs in a direction away from the split ball valve, and the limiting member being located at the end of the connecting rod away from the connecting lugs.

[0018] In one embodiment, the sealing structure includes a plurality of sealing rings distributed along the axial direction of the spray branch pipe, and the sealing rings are in a sealing fit with the spray branch pipe.

[0019] This utility model also proposes a polyester film production equipment, including the aforementioned vacuum system cleaning device.

[0020] The technical solution of this utility model, on the one hand, by setting a split ball valve and a packing flange, ensures that the condensation chamber remains in a vacuum state during the disassembly and assembly / removal of the spray assembly, thus preventing production line interruption. On the other hand, by setting a limiting component, it can prevent the spray assembly from being misoperated, which could lead to the condensation chamber failing to maintain a vacuum state, and also provides a clear indication, allowing users to intuitively understand whether the nozzle has retracted from the split ball valve and entered the packing flange, thereby improving the convenience of the spray assembly's assembly and disassembly / removal operations. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0022] Figure 1 A schematic diagram of the structure of a scraper condenser in an embodiment of the vacuum system cleaning device provided by this utility model;

[0023] Figure 2 This is a schematic diagram of the structure of an embodiment of the spray assembly provided by this utility model;

[0024] Figure 3 for Figure 2 The illustrated embodiment is a structural diagram of the nozzle assembly in another state;

[0025] Figure 4 for Figure 3 A partial structural diagram of the middle section when the nozzle assembly is in another state;

[0026] Figure 5 for Figure 3 A schematic diagram of the nozzle assembly.

[0027] Explanation of icon numbers:

[0028] 100. Cylinder body; 101. Condensation chamber; 102. Mounting hole; 103. Vacuum extraction hole;

[0029] 200. Spray assembly; 210. Nozzle assembly; 211. Spray branch pipe; 212. Nozzle; 213. Inlet flange; 214. Mounting flange; 215. Inlet valve; 216. Handwheel; 220. Sealing assembly; 221. Fixed flange; 222. Split ball valve; 223. Packing flange; 224. Sealing structure; 225. Mounting pipe;

[0030] 300, Limiting component; 310, Connector; 311, Connecting lug; 312, Connecting rod; 320, Limiting component; 321, Limiting part; 322, Telescopic part; 323, Mounting part; 324, Limiting side; 325, Guide side; 330, Elastic reset component.

[0031] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0033] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0034] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0035] Polyester film, or PET film, is a transparent plastic film made of polyethylene terephthalate (PET). Its production process utilizes a polycondensation unit. During the polycondensation reaction, ethylene glycol molecules are released, existing in a gaseous form within the reactor. To ensure the polycondensation reaction continues, this ethylene glycol vapor must be removed promptly. A vacuum system is used to extract the ethylene glycol vapor from the reactor, increasing the vacuum level inside the reactor and thus promoting polymer chain growth and increasing the degree of polymerization.

[0036] When ethylene glycol vapor is rapidly extracted from the reactor, oligomers inside the reactor are carried away by the vapor and enter the vacuum system. Condensed ethylene glycol, sprayed through nozzles on the scraped condenser, condenses the extracted vapor. The condensed glycol is then collected in a hot well at the bottom of the scraped condenser for recycling. Non-condensable gases are continuously extracted by the vacuum unit, simultaneously capturing the oligomers carried by the ethylene glycol vapor, thus achieving online cleaning of the vacuum system.

[0037] Among them, nozzles, as important components of spray towers, are prone to clogging if they are not cleaned in a timely manner after prolonged use. On the one hand, how to prevent air from entering the scraper condenser during nozzle disassembly to maintain the vacuum system and ensure uninterrupted production; on the other hand, how to improve the ease of nozzle disassembly are both technical problems that urgently need to be solved in this field.

[0038] In view of this, the present invention proposes a vacuum system cleaning device that can keep the vacuum system in a vacuum state, so that the production line can continue to operate without interruption, and improves the ease of disassembly of the nozzle.

[0039] Please see Figures 1 to 5 ,in, Figure 2The spray assembly 200 shown is in the installed position (i.e., nozzle 212 is inserted into condensation chamber 101). Figure 3 The spray assembly 200 shown is in a state where the nozzle 212 is located inside the packing flange 223, and the mounting flange 214 is blocked by the retaining element 320 and cannot be pulled out further. Figure 4 The spray assembly 200 shown is in a state where the mounting flange 214 has passed the limit member 320 and can continue to be pulled out.

[0040] In one embodiment of this utility model, the vacuum system cleaning device includes a condensate inlet pipeline, a scraper condenser, and a vacuum unit. The scraper condenser includes a cylinder 100 and a spray assembly 200. The cylinder 100 has a condensation chamber 101, and the side wall of the cylinder 100 has a mounting hole 102 communicating with the condensation chamber 101. The top wall of the cylinder 100 has a vacuum extraction port 103 communicating with the condensation chamber 101, and the vacuum extraction port 103 is connected to the vacuum unit. The spray assembly 200 includes a nozzle assembly 210 and a sealing assembly 220. The nozzle assembly 210 includes a spray branch pipe 211, a nozzle 212, and a liquid inlet flange 213. The mounting flange 214 and the inlet valve 215 are installed. The inner end of the spray branch pipe 211 extends into the condensation chamber 101 and is equipped with a nozzle 212. The outer end of the spray branch pipe 211 is connected to the inlet flange 213 through the inlet valve 215. The inlet flange 213 is detachably connected to the condensate inlet pipeline. The sealing assembly 220 includes a fixed flange 221, a split ball valve 222 and a packing flange 223 connected in sequence. The split ball valve 222 is installed on the cylinder 100 through the fixed flange 221 and communicates with the mounting hole 102. The packing flange 223 is provided with a sealing structure 224. The mounting flange 214 is detachably connected to the packing flange 223.

[0041] Please see Figure 1 Specifically, the spray assembly 200 is provided with multiple spray units. The condensate inlet pipeline typically includes a main pipeline, multiple branch pipelines, and multiple branch valves. The branch valves are installed on the branch pipelines one by one. The multiple branch pipelines are connected to the main pipeline respectively, and the opening and closing of the branch valves realizes the conduction or cut-off of the corresponding branch pipelines. The branch pipelines are detachably connected to the liquid inlet flange 213. Each branch pipeline is connected to a nozzle assembly 210.

[0042] When it is necessary to disassemble the nozzle assembly 210 to clean the nozzle 212, first close the branch valve to prevent the condensed ethylene glycol in the main pipeline from continuing to flow into the nozzle assembly 210, and close the inlet valve 215. Then, remove the fasteners (e.g., bolts) between the inlet flange 213 and the branch pipeline, as well as the fasteners (e.g., bolts) between the mounting flange 214 and the packing flange 223, so that the nozzle assembly 210 can move freely. Then, pull the nozzle assembly 210 out until the nozzle 212 is completely out of the position of the split ball valve 222, that is, pull it out until the nozzle 212 is back into the packing flange 223. Then, rotate the split ball valve 222 to the closed position to cut off the connection between the condensation chamber 101 and the packing flange 223. Finally, pull the nozzle assembly 210 out of the packing flange 223 completely. At this time, the nozzle 212 on the nozzle assembly 210 can be cleaned. It is understood that by dividing the disassembly and removal of the nozzle assembly 210 into two stages, and rotating the split ball valve 222 to the closed state during the interval between these two stages, the condenser chamber 101 is prevented from communicating with the outside world, and outside air cannot pass through the split ball valve 222 to enter the condenser chamber 101, thereby enabling the condenser chamber 101 and the vacuum system to maintain a vacuum state and the production line to continue production.

[0043] After cleaning, when the nozzle assembly 210 needs to be reinstalled into the condenser chamber 101, first close the inlet valve 215, and insert the nozzle 212 and spray branch pipe 211 of the nozzle assembly 210 into the packing flange 223. Utilize the sealing fit between the spray branch pipe 211 and the sealing structure 224 inside the packing flange 223 to cut off the connection between the packing flange 223 and the outside. Then rotate the split ball valve 222 to the open state so that the nozzle assembly 210 can pass through the split ball valve 222. Continue to insert the nozzle assembly 210 inward until the nozzle 212 is inserted into the condenser chamber 101. Then reinstall the fasteners between the inlet flange 213 and the branch pipe, as well as the fasteners between the mounting flange 214 and the packing flange 223. Finally, open the branch valve and the inlet valve 215 so that the condensed ethylene glycol in the main pipeline can flow into the nozzle assembly 210 and be sprayed into the condenser chamber 101 through the nozzle 212. It is understandable that by dividing the installation operation of the nozzle assembly 210 into two stages, and by utilizing the sealing cooperation between the spray branch pipe 211 and the sealing structure 224 in the packing flange 223, as well as the liquid inlet valve 215 in the closed state, the connection between the packing flange 223 and the outside world is cut off. This ensures that even if the split ball valve 222 is rotated to the open state, the condensing chamber 101 cannot be connected to the outside world, and outside air cannot pass through the packing flange 223 to enter the condensing chamber 101. As a result, the condensing chamber 101 and the vacuum system can maintain a vacuum state, and the production line can continue to operate without interruption.

[0044] Please see Figures 2 to 4Optionally, the spray assembly 200 further includes a limiting assembly 300, which includes a connector 310 and a limiting member 320. The limiting member 320 is movable on the connector 310 in a direction intersecting the installation direction of the nozzle assembly 210, and has a limiting position and an unlimited position. When the nozzle 212 moves to the packing flange 223, the mounting flange 214 is limited and constrained by the limiting member 320 in the limiting position. After the limiting member 320 switches to the unlimited position, the inner end of the spray branch pipe 211 can freely exit the packing flange 223.

[0045] Specifically, when the limiting member 320 is not subjected to external operating force, it is in the restricted position by default. Therefore, when the nozzle assembly 210 is removed, when the nozzle assembly 210 is pulled out until the nozzle 212 is inside the packing flange 223, the nozzle assembly 210 cannot be pulled out further due to the restriction of the limiting member 320 on the mounting flange 214. This ensures that the spray branch pipe 211 still maintains a sealed fit with the sealing structure 224 inside the packing flange 223, thereby ensuring that the condensation chamber 101 remains in a vacuum state.

[0046] It is understandable that if the nozzle assembly 210 is not constrained, and is accidentally pulled out at once, completely detached from the packing flange 223, then since the split ball valve 222 has not yet rotated to the closed state, and the packing flange 223 has lost its sealing effect with the spray branch pipe 211, the condensation chamber 101 can be connected to the outside through the split ball valve 222 and the packing flange 223. In this embodiment, by setting the limiting member 320, the above-mentioned misoperation can be avoided.

[0047] On the other hand, when the limiting element 320 of the mounting flange 214 obstructs the nozzle assembly 210 from being pulled out further, the user is clearly informed that the nozzle 212 has been completely removed from the split ball valve 222, allowing the split ball valve 222 to be rotated to switch it to the closed state. After rotating the split ball valve 222 to the closed state, operating the limiting element 320 to switch it to the unrestricted position allows the nozzle assembly 210 to continue the removal and removal operation until the nozzle assembly 210 is completely removed from the packing flange 223.

[0048] The technical solution of this utility model, on the one hand, by setting the split ball valve 222 and the packing flange 223, ensures that the condensing chamber 101 remains in a vacuum state during the disassembly and assembly / removal of the nozzle assembly 210, thus preventing production line interruption. On the other hand, by setting the limiting component 320, it can prevent the nozzle assembly 210 from being misoperated, which could lead to the condensing chamber 101 failing to maintain a vacuum state, and can also provide a clear indication, allowing the user to intuitively understand whether the nozzle 212 has exited the split ball valve 222 and entered the packing flange 223, thereby improving the convenience of the disassembly and assembly of the nozzle assembly 210.

[0049] Of course, in some other embodiments, the limiting component 300 may not be provided. For example, a laser rangefinder and a prompter electrically connected to each other can be provided. Both the laser rangefinder and the prompter are located on the mounting flange 214 and facing the mounting flange 214. They can measure the distance between the mounting flange 214 and the packing flange 223. When the measured distance between the two reaches a preset distance value, the prompter is controlled to emit a prompt sound or a prompt light to indicate to the user that the nozzle 212 has moved to the packing flange 223, and the disassembly and removal operation of the nozzle assembly 210 needs to be paused, and the split ball valve 222 needs to be closed. The preset distance value corresponds to the distance between the mounting flange 214 and the packing flange 223 when the nozzle 212 is inside the packing flange 223. Its value can be set according to the actual size of the spray assembly 200, and this application does not specifically limit it. In other embodiments, the limiting component 300, the laser rangefinder, and the prompter can be provided simultaneously.

[0050] Optionally, the branch line is configured as a flexible metal pipe so that after the branch line is disconnected from the inlet flange 213, it can be moved to make room for the nozzle assembly 210 to move. Of course, in other embodiments, the branch line can also be rotatably connected to the main line, so that the branch line can be rotated away to make room for the nozzle assembly 210 to move.

[0051] Optionally, the sealing structure 224 includes multiple sealing rings distributed along the axial direction of the spray branch pipe 211, and the sealing rings are in sealing engagement with the spray branch pipe 211. This results in a simple and easy-to-implement structure.

[0052] Please see Figure 2Optionally, the sealing assembly 220 also includes an installation tube 225, the inner end of which passes through the installation hole 102. The wall of the installation tube 225 is sealed and welded to the cylinder 100. A fixing flange 221 is welded and fixed to the outer end of the installation tube 225. The nozzle 212 can pass through the installation tube 225 and enter the condensing chamber 101. The scraper condenser also includes an inner sealing plate, the upper end of which is rotatably connected to the installation tube 225 and can rotatably cover the inner end of the installation tube 225. When the nozzle 212 is inserted inward, the nozzle 212 and the spray branch pipe 211 can push open the inner sealing plate and enter the condensing chamber 101. When the nozzle 212 is pulled outward, the inner sealing plate will automatically cover the inner end of the installation tube 225 under the action of gravity, thereby reducing the probability of oligomers in the condensing chamber 101 entering the interior of the sealing assembly 220.

[0053] Please see Figure 4 The limiting component 300 also includes an elastic reset member 330. During the movement of the limiting member 320 from the limiting position to the releasing position, the elastic potential energy of the elastic reset member 330 increases. Thus, the elastic force of the elastic reset member 330 can maintain the limiting member 320 in the limiting position, and by overcoming the elastic force of the elastic reset member 330, the limiting member 320 can be switched to the releasing position, making operation convenient. Of course, in other embodiments, the elastic reset member 330 may not be provided. For example, the limiting member 320 may have two locking structures, which can be selectively locked to the connecting member 310. The two locking structures are spaced apart along the moving direction of the limiting member 320 and correspond to the limiting position and the releasing position respectively.

[0054] Please see Figure 4 Optionally, the limiting member 320 includes a limiting part 321, a telescopic part 322, and a mounting part 323 distributed and connected sequentially along a first direction. The telescopic part 322 is movably inserted through the connecting member 310. The mounting part 323 and the limiting part 321 are respectively located on opposite sides of the connecting member 310, with the limiting part 321 positioned close to the spray branch pipe 211. An elastic reset member 330 is connected between the mounting part 323 and the connecting member 310. This results in a simple structure that is easy to implement. Optionally, the limiting part 321 and the telescopic part 322 are threaded together to facilitate replacement of the worn limiting part 321. The first direction can be a vertical direction, i.e., a vertical direction, with both the limiting part 321 and the mounting flange 214 located below the connecting member 310.

[0055] Optionally, the elastic reset member 330 is configured as a compression spring, with one end welded and fixed to the mounting portion 323 and the other end welded and fixed to the connecting member 310. This results in a simple and easy-to-implement structure. Of course, in other embodiments, the elastic reset member 330 is configured as a rubber body, a spring sheet, or a tension spring.

[0056] Please see Figure 3 Optionally, at the restricted position, the limiting part 321 abuts against the end face of the mounting flange 214 away from the packing flange 223 to restrict the spray branch pipe 211 from exiting the packing flange 223. This results in a simple structure and easy operation. Of course, in other embodiments, the mounting flange 214 may be provided with a groove, and the limiting part 321 may engage with the groove to restrict and constrain the mounting flange 214.

[0057] Please see Figure 4 Optionally, the limiting part 321 is provided with a limiting side 324 and a guide side 325 opposite to each other in the installation direction of the nozzle assembly 210. The limiting side 324 is located near the packing flange 223, and the guide side 325 extends obliquely towards the spray branch pipe 211 in the direction near the packing flange 223. During the insertion of the spray branch pipe 211 into the sealing assembly 220, the outer periphery of the mounting flange 214 slides against the guide side 325. Thus, during the installation operation of the nozzle assembly 210, the sliding contact between the outer periphery of the mounting flange 214 and the guide side 325 can cause the limiting part 321 to move towards the release position, so that the mounting flange 214 can pass over the limiting part 321. After the mounting flange 214 passes over the limiting part 321, the limiting part 321 can return to the limiting position under the elastic force of the elastic reset member 330. In this way, the limiting part 321 can be automatically released from its constraint during the installation of the nozzle assembly 210, thereby improving the ease of installation of the nozzle assembly 210.

[0058] Optionally, the guide side 325 is configured as a convex arc surface. This facilitates the manufacturing and processing of the limiting part 321 and improves the smoothness of sliding of the mounting flange 214 on the guide side 325. Of course, in other embodiments, the guide side 325 can also be configured as a sloped plane.

[0059] Please see Figure 3 and Figure 5 ,in, Figure 3 The axis of the handwheel of the gate valve shown extends in a direction perpendicular to the plane of the paper. Figure 5 The axis of the handwheel of the gate valve shown extends in the vertical direction because... Figure 5 Based on Figure 3 The structure shown is obtained by rotating it 90° around the axis of the spray branch pipe 211, so that... Figure 5 The gate valve is able to Figure 5The entire upper portion of the central spray branch pipe 211 is shown. Optionally, the inlet valve 215 is configured as a gate valve, with the axis of the gate valve's handwheel 216 perpendicular to the first direction. That is, the handwheel 216 of the gate valve and the limiting member 320 are offset along the axial direction of the spray branch pipe 211, which avoids motion interference between the handwheel 216 and the limiting member 320 during the assembly and disassembly of the nozzle assembly 210. Of course, in other embodiments, the inlet valve 215 can also be configured with other structural forms, which are not specifically limited in this application.

[0060] Please see Figure 3 Optionally, the connector 310 includes an intersecting and connected connecting lug 311 and a connecting rod 312. The connecting lug 311 is fixed to the circumferential side of the packing flange 223, and the connecting rod 312 extends from the connecting lug 311 in a direction away from the split ball valve 222. A limiting member 320 is provided at the end of the connecting rod 312 away from the connecting lug 311. This design is simple and easy to implement. Furthermore, by providing the connecting lug 311, the connection strength and stability between the connector 310 and the packing flange 223 can be enhanced, thereby improving the positional accuracy of the connecting rod 312 and the limiting member 320 thereon.

[0061] This utility model also proposes a polyester film production equipment, which includes a vacuum system cleaning device. The specific structure of the vacuum system cleaning device is as described in the above embodiments. Since this second subject adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here.

[0062] The polyester film production equipment employs a biaxial stretching process, the flow of which includes: raw material mixing, drying, extrusion, casting, longitudinal stretching, transverse stretching, traction, and winding. A vacuum system is integrated into the extrusion equipment, which includes the aforementioned vacuum system cleaning device.

[0063] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A vacuum system cleaning device, characterized in that, It includes a condensate inlet pipeline, a scraped condenser, and a vacuum unit, wherein the scraped condenser includes: The cylindrical body includes a condensation chamber. The side wall of the cylindrical body has mounting holes communicating with the condensation chamber, and the top wall of the cylindrical body has a vacuum extraction port communicating with the condensation chamber. The vacuum extraction port is connected to the vacuum unit. A spray assembly includes a nozzle assembly, a sealing assembly, and a limiting assembly. The nozzle assembly includes a spray branch pipe, a nozzle, an inlet flange, a mounting flange, and an inlet valve. The inner end of the spray branch pipe extends into the condensation chamber and is fitted with the nozzle. The outer end of the spray branch pipe is connected to the inlet flange via the inlet valve. The inlet flange is detachably connected to the condensate inlet pipeline. The sealing assembly includes a fixed flange, a split ball valve, and a packing flange connected in sequence. The split ball valve is installed on the cylinder through the fixed flange and communicates with the mounting hole. The packing flange has a sealing structure inside, and the mounting flange is detachably connected to the packing flange. The limiting assembly includes a connector and a limiting member. The limiting member is movable on the connector in a direction intersecting the installation direction of the nozzle assembly and has a limiting position and a releasing position. When the nozzle moves to the packing flange, the mounting flange is limited and constrained by the limiting member in the limiting position. After the limiting member switches to the releasing position, the inner end of the spray branch pipe can freely exit the packing flange. The limiting component also includes an elastic reset member, whose elastic potential energy increases as the limiting member moves from the limiting position toward the releasing position. The limiting member includes a limiting part, a telescopic part, and a mounting part distributed along a first direction and connected in sequence. The telescopic part is movably inserted through the connecting member. The mounting part and the limiting part are located on opposite sides of the connecting member, and the limiting part is located close to the spray branch pipe. The elastic reset member is connected between the mounting part and the connecting member. The elastic reset element is configured as a compression spring, one end of which is welded and fixed to the mounting part, and the other end of which is welded and fixed to the connecting part; At the restricted position, the limiting part is limited to abutting against the end face of the mounting flange away from the packing flange, so as to restrict the spray branch pipe from exiting the packing flange; The limiting part has a limiting side and a guide side opposite to each other in the installation direction of the nozzle assembly. The limiting side is located near the packing flange, and the guide side extends obliquely towards the spray branch pipe in the direction near the packing flange. The guide side is configured as an outwardly convex arc surface. During the process of inserting the spray branch pipe into the sealing assembly, the outer periphery of the mounting flange slides against the guide side.

2. The vacuum system cleaning device as described in claim 1, characterized in that, The inlet valve is configured as a gate valve, and the axis of the handwheel of the gate valve is set perpendicular to the first direction.

3. The vacuum system cleaning device as described in claim 1, characterized in that, The connector includes intersecting and connected connecting lugs and a connecting rod. The connecting lugs are fixed to the circumferential side of the packing flange, and the connecting rod extends from the connecting lugs in a direction away from the split ball valve. The limiting member is located at the end of the connecting rod away from the connecting lugs. And / or, the sealing structure includes a plurality of sealing rings distributed along the axial direction of the spray branch pipe, the sealing rings being in a sealing fit with the spray branch pipe.

4. A polyester film production equipment, characterized in that, Includes a vacuum system cleaning device as described in any one of claims 1 to 3.

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