Vacuum washing device for polyester device

Abstract

The utility model relates to a vacuum washing device for a polyester device, which comprises a separator, a washer and a dehydrator, the washer is arranged in the separator in a penetrating manner, the dehydrator is sleeved in a gap between the separator and the washer, the washer is provided with a washing cavity, and atomized liquid and gas entering the washing cavity have the same flow direction. The vacuum washing device for the polyester device is small in size and simple in structure, the atomized liquid in the washing cavity and the gas flow direction are set to be the same, the atomized liquid makes contact with the gas more sufficiently, small-molecule polymers in the gas are thoroughly removed, and the service life of the device is prolonged. And the atomized liquid does not cause negative influence on the vacuum degree of the gas source equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of washing equipment, in particular to a vacuum washing device for a polyester device. Background Art

[0002] During the polycondensation stage of the polymerization reaction, BHET (bis(hydroxyethyl) terephthalate)) produced during the esterification process undergoes an intermolecular polycondensation reaction under the catalytic action of high temperature and a catalyst, releasing ethylene glycol (EG) molecules. To increase the degree of polymerization (DP) of the resulting product, the generated EG needs to be quickly separated from the system. To this end, a spray condenser is typically installed at the vapor phase outlet of the polycondensation reactor, and a steam jet vacuum pump unit is installed in the downstream process of the spray condenser. The spray condenser's function is to condense, collect, and recycle the gaseous EG. Non-condensable gases, along with a small amount of condensable gases and small polymers, flow out of the spray condenser's gas outlet and enter the steam jet vacuum pump unit. The small polymers carried by the gas flow continuously accumulate on the inner wall of the vacuum line, gradually reducing the flow rate of the vacuum line and the output of the polymerization unit. When the small polymers accumulate to a certain extent, they can fall off in pieces, directly blocking the vacuum line or the three-stage steam jet vacuum pump unit, causing the polymerization unit to shut down. To avoid this, a vacuum scrubber is typically installed between the spray condenser and the steam jet vacuum pump unit.

[0003] A vacuum scrubber typically utilizes a vertical cylindrical container with an EG nozzle installed at the top and an umbrella-shaped spray system inside. This system utilizes EG liquid atomization to capture condensable gases and small polymers. In this vacuum scrubber, gas from the spray condenser enters the scrubber from the bottom, in the opposite direction of the EG flow inside the scrubber. This increases resistance to gas flow, resulting in poor capture of condensable gases and small polymers and potentially causing a decrease in the vacuum level of the spray condenser. Because there are relatively few similar technical solutions within the field of this application, no examples are provided. Utility Model Content

[0004] In view of the fact that the current vacuum scrubbers have poor capture effects on condensable gases and small molecule polymers, and affect the vacuum degree of the spray condenser, the utility model proposes a vacuum scrubber for a polyester device that ensures the capture effect on condensable gases and small molecule polymers while not affecting the vacuum degree of the spray condenser.

[0005] In order to achieve the above technical effects, the present invention proposes:

[0006] A vacuum scrubbing device for a polyester production plant comprises a separator, a scrubber disposed within the separator, and a dehumidifier disposed within the gap between the separator and the scrubber. The scrubber has a scrubbing chamber, into which atomized liquid and gas flow in the same direction. The scrubbing liquid and gas are introduced into the scrubber, where the scrubbing liquid is atomized and captures small molecular polymers and condensable gases in the gas. The atomized scrubbing liquid and gas flow in the same direction within the scrubber, extending the contact time between the atomized liquid and gas. The dehumidifier within the separator separates the gas from the scrubbing chamber, achieving a thorough scrubbing effect and preventing the atomized liquid from affecting the airtightness of the gas source equipment.

[0007] The separator includes a cylindrical body having an upper end with an upward opening and a lower end with a downward opening. The separator also includes a head connected to the upper end of the body and a conical shell connected to the lower end of the body. The head, cylindrical body, and conical shell are sequentially connected to form the separator.

[0008] The cylindrical body is provided with an air outlet on the side, the head is provided with a center hole, the end with a larger inner diameter of the conical shell is connected to the cylindrical body, and the end with a smaller inner diameter of the conical shell is a liquid outlet. The cone can form a liquid collecting cavity on the inner surface, and an anti-vortex baffle is provided in the liquid collecting cavity. The cylindrical body is provided with an air outlet on the side for discharging the washed gas, the head is provided with a center hole for passing a scrubber, and the center hole and the scrubber are sealed. The conical shell is in a conical cylindrical shape, the end with a larger inner diameter of the conical shell is connected to the cylindrical body, and the end with a smaller inner diameter of the conical shell is a liquid outlet for discharging the washed liquid. The inner surface of the conical shell forms a liquid collecting cavity for collecting the liquid in the separator. An anti-vortex baffle is provided in the liquid collecting cavity for preventing the washed liquid from generating vortexes inside the conical shell. The anti-vortex baffle can be a cross baffle.

[0009] The scrubber includes a connecting pipe and an extension pipe, the connecting pipe being passed through the central hole, the air inlet being provided on the side of the connecting pipe located outside the separator, the connecting pipe being sealed at one end outside the separator and being provided with a liquid inlet pipe, the liquid inlet pipe being connected to a nozzle, the nozzle being located inside the scrubber, the extension pipe being a conical pipe, the end of the extension pipe having a smaller inner diameter being connected to the connecting pipe, the inner side of the connecting pipe and the inner side of the extension pipe forming the scrubbing chamber. The connecting pipe and the extension pipe are connected, the connecting pipe being passed through the central hole, the connecting pipe and the central hole being sealed, the connecting pipe being partially located outside the separator and partially located inside the separator, the portion of the connecting pipe located outside the separator being provided with an air inlet, the air inlet being provided on the side of the connecting pipe, the liquid inlet pipe being connected to a nozzle, the nozzle being located inside the scrubber, the connecting pipe being sealed at one end outside the separator and being provided with a liquid inlet pipe, the extension pipe being a conical pipe, the end of the extension pipe having a smaller inner diameter being connected to the connecting pipe, the inner side of the connecting pipe and the inner side of the extension pipe forming the scrubbing chamber, the atomized liquid and gas being in contact within the scrubbing chamber.

[0010] The dehumidifier includes a first cover tube and a second cover tube, both of which are cylindrical, the first cover tube and the second cover tube have the same height, the inner diameter of the first cover tube is larger than the inner diameter of the second cover tube, the first cover tube and the second cover tube are arranged with their axes coinciding, the second cover tube is connected to the scrubber, and the dehumidifier also includes a plurality of swirl blades evenly arranged between the first cover tube and the second cover tube, the swirl blades having a certain angle in the vertical direction and a certain angle in the radial direction of the first cover tube. The dehumidifier includes two coaxially arranged cylindrical structural components, including a first cover tube with a larger inner diameter and a first cover tube with a smaller inner diameter, the second cover tube is connected to the scrubber, and a plurality of swirl blades are evenly arranged between the first cover tube and the second cover tube, the swirl liquid sheet having a certain angle in the vertical direction and a certain angle in the radial direction of the first cover tube. When the scrubbed gas passes through the dehumidifier, due to the action of the swirl blades, the liquid droplets in the gas are moved in a direction away from the axis of the first cover tube under the action of centrifugal force.

[0011] The dehumidifier also includes a ring plate. The ring plate is annular, with an inner diameter slightly smaller than the inner diameter of the first shield tube. The ring plate and the first shield tube are arranged to coincide with each other and are connected to each other. The outer diameter side of the ring plate is connected to the inner side of the separator. The ring plate is provided with a number of evenly spaced tear holes. The ring plate is annular, with an inner diameter slightly smaller than the inner diameter of the first shield tube. The ring plate and the first shield tube are arranged to coincide with each other and are connected to each other. The outer diameter side of the ring plate is connected to the inner side of the separator. The ring plate is provided with a number of evenly spaced tear holes. The tear holes are used to discharge the droplets separated by the dehumidifier.

[0012] The inner side of the separator, the outer side of the scrubber located inside the separator, and the water remover form a gas-liquid separation chamber. The gas-liquid separation chamber is used to separate the scrubbed gas into gas and liquid, and separate the residual liquid droplets in the gas.

[0013] The dewatering device and the inner surface of the separator form a liquid receiving tank, into which the liquid separated by the gas-liquid separation chamber flows. The dewatering device and the inner surface of the separator form a liquid receiving tank, into which the liquid separated by the gas-liquid separation chamber adheres to the inner surface of the separator, and the accumulated liquid droplets flow into the liquid receiving tank below the gas-liquid separation chamber.

[0014] The beneficial effects of the utility model are:

[0015] The vacuum scrubber for polyester device of the utility model has small size and simple structure. The spraying direction of the nozzle is the same as the flow direction of the gas entering the air inlet. The atomized EG liquid is in contact with the gas for a longer time, and the small molecular polymer is completely removed. It also avoids the problem that the gas and the spraying direction are opposite to each other and affect the vacuum degree of the gas source equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of a vacuum washing device for a polyester device.

[0017] Figure 2 It is a structural diagram of the scrubber.

[0018] Figure 3 It is a structural diagram of the cyclone plate water removal device.

[0019] Figure 4 It is a structural diagram of the scrubber in Example 2.

[0020] Figure Number:

[0021] 1. Separator; 2. Scrubber; 3. Water remover; 4. Scrubbing chamber; 5. Gas-liquid separation chamber; 6. Liquid collecting chamber; 7. Liquid receiving tank; 11. Cylindrical barrel; 12. Head; 13. Conical shell; 14. Anti-vortex baffle; 15. Air outlet; 16. Liquid outlet; 21. Connecting pipe; 22. Extension pipe; 23. Air inlet; 24. Liquid inlet pipe; 25. Nozzle; 31. First cover cylinder; 32. Second cover cylinder; 33. Ring plate; 34. Swirl blade; 35. Tear hole. DETAILED DESCRIPTION

[0022] The following describes the implementation of the present invention through specific embodiments. People familiar with this technology can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0023] The utility model provides a vacuum cleaning device for a polyester device. The preferred embodiments of the vacuum cleaning device for a polyester device are described below.

[0024] Example 1

[0025] like Figure 1 As shown, the vacuum washing device for a polyester device includes a separator 1, a scrubber 2 disposed within the separator 1, and a water remover 3 disposed within the separator 1 and connected to the scrubber 2. The separator 1 includes a cylindrical body 11 having an upper end with an upward opening and a lower end with a downward opening. The separator 1 also includes a head 12 connected to the upper end of the body and a conical shell 13 connected to the lower end of the body. The head 12, cylindrical body 11 and conical shell 13 are connected in sequence. The head 12 adopts an elliptical head 12 structure and is provided with a center hole. The center hole is used to pass the scrubber 2. The cylindrical body 11 has an upper end with an opening facing upward and a lower end with an opening facing downward. The upper end of the body is connected to the head 12, and the lower end of the body is connected to the conical shell 13. An air outlet 15 is provided on the side of the cylindrical body 11 for discharging the washed gas. The air outlet 15 is a hole opened on the side of the cylindrical body 11 and connected to a tubular structure, and a flange is connected to the other end of the tubular structure; a section with a larger inner diameter of the conical shell 13 is connected to the cylindrical body 11, and an end with a smaller inner diameter is a liquid outlet 16. The outside of the liquid outlet 16 is connected to a tubular structure, and the other end of the tubular structure is connected to a flange. An anti-vortex baffle 14 is provided on the inner side of the conical shell 13 near the liquid outlet 16. The anti-vortex baffle 14 is a cross structure.

[0026] like Figure 2 As shown, the scrubber 2 includes a connecting pipe 21 and an extension pipe 22 that are interconnected. The connecting pipe 21 is inserted into the center hole. The connecting pipe 21 and the center hole are sealed. A portion of the connecting pipe 21 is located inside the separator 1, and a portion is located outside the separator 1. An air inlet is provided on the side of the portion located outside the separator 1. The air inlet is formed by opening a through hole on the side of the connecting pipe 21 and connecting one end of a tubular structure, and connecting a flange at the other end of the tubular structure. The end of the connecting pipe 21 located outside the separator 1 is closed and penetrated by a liquid inlet pipe 24. The liquid inlet pipe 24 is used to connect and transport the washing liquid and transport the washing liquid into the scrubber 2. The liquid inlet pipe 24 is located inside the scrubber 2 and is connected to the nozzle 25 at one end. The nozzle 25 sprays the washing liquid in the liquid inlet pipe 24 into the scrubber 2; the extension pipe 22 is a conical tube, located on the inner side of the scrubber 2, and is connected to the connecting pipe 21 at the end with a smaller inner diameter. The atomized washing liquid sprayed by the nozzle 25 can be gathered on the inner side of the extension pipe 22, flow through the inner side of the extension pipe 22, and drip from the end with a larger inner diameter under the action of gravity, and enter the inner side of the conical shell 13 of the separator 1.

[0027] like Figure 3As shown, the water eliminator 3 includes a first cover tube 31 and a second cover tube 32 with two different inner diameters arranged with two coinciding axes. The inner diameter of the first cover tube 31 is larger than the inner diameter of the second cover tube 32. A number of swirl blades 34 are evenly arranged between the first cover tube 31 and the second cover tube 32. The swirl blades 34 have a certain angle in the vertical direction and in the radial direction with the first cover tube 31. When the gas passes through the swirl blades 34 of the water eliminator 3, a rotating flow will be generated, and the droplets in the gas are separated from the gas by the centrifugal force. The water eliminator 3 also includes a ring plate 33. The inner diameter of the ring plate 33 is slightly smaller than the inner diameter of the first cover tube 31. The ring plate 33 is coaxially arranged and connected to the first cover tube 31. The outer side surface of the ring plate 33 is connected to the inner surface of the cylindrical body 11. Twelve evenly arranged tear holes 35 are provided on the ring plate 33.

[0028] There is a washing chamber 4 inside the scrubber 2, and the inner side surfaces of the connecting pipe 21 and the inner side surfaces of the extension pipe 22 form the washing chamber 4. The atomized washing liquid sprayed by the nozzle 25 and the gas entering from the air inlet 23 contact in the washing chamber 4 and wash the gas. The atomized washing liquid can adhere to the inner side surfaces of the connecting pipe 21 and the extension pipe 22, accumulate to form droplets, and flow through the inner side surfaces of the extension pipe 22 under the action of gravity and drip into the liquid collecting chamber 6 below the extension pipe 22. The gas flows through the inner surface of the extension pipe 22 and contacts with the washing liquid to achieve a washing effect. After the scrubbed gas exits the expansion pipe 22, it passes through the dehumidifier 3 and enters the gas-liquid separation chamber. The gas-liquid separation chamber is composed of the outer surface of the scrubber 2 located within the separation chamber, the inner surface of the separator 1, and the dehumidifier 3. After the gas passes through the swirl blades 34, a rotating flow is generated. The liquid droplets in the gas are centrifuged and adhere to the inner surface of the separator 1 in the gas-liquid separation chamber. After the droplets accumulate, they flow through the inner surface of the separator 1 under the action of gravity and fall into the liquid receiving tank 7. The gas after gas-liquid separation is discharged through the gas outlet 15 of the cylindrical body 11. The liquid receiving tank 7 is composed of the dehumidifier 3 and the inner surface of the separator 1. The liquid dripping into the liquid receiving tank 7 is discharged through the tear hole 35 and enters the liquid collecting chamber 6. The liquid collecting chamber 6 is composed of the inner surface of the conical shell 13. The liquid collecting chamber 6 is provided with a cross-shaped anti-vortex baffle 14. The scrubbing liquid and the liquid separated from the gas and liquid are collected by the liquid collecting chamber 6 and recycled through the liquid outlet 16.

[0029] The following describes the working state of the vacuum washing device for polyester device:

[0030] The air inlet 23 of the scrubber 2 is connected to the spray condenser, the liquid inlet pipe 24 of the scrubber 2 is connected to the EG circulation pump, the air outlet 15 is connected to the steam jet vacuum pump unit, and the liquid outlet 16 is connected to the fine filter. During operation, the EG washing liquid is pumped into the liquid inlet pipe 24, and the EG washing liquid is sprayed into the washing chamber 4 in a conical shape through the liquid inlet pipe 24 and the solid cone nozzle 25, with good atomization effect. The EG mixed steam from the spray condenser is introduced into the air inlet 23, and the EG mixed steam enters the washing chamber 4, where it fully contacts the atomized EG washing liquid. Due to the same flow direction, the EG mixed steam and the atomized EG washing liquid are in contact for a long time, and the washing effect is good. At the same time, the EG washing liquid sprayed by the solid cone nozzle 25 will also flow through the inner surface of the scrubber 2 and flow down from the end of the extension pipe 22. During this period, the EG mixed steam contacts the EG washing liquid on the inner surface of the scrubber 2, which can also achieve a washing effect. The EG washing liquid flowing out of the washing chamber 4 The G washing liquid flows into the liquid collecting chamber 6. The conical structure of the liquid collecting chamber 6 concentrates the EG washing liquid at the liquid outlet 16. The cross-shaped anti-vortex baffle 14 installed in the liquid collecting chamber 6 prevents the EG washing liquid from generating vortices, which would affect its collection. The EG mixed steam flowing out of the washing chamber 4 passes through the water eliminator 3 and enters the gas-liquid separation chamber. The EG mixed steam is generated by the swirl blades 34 in the water eliminator 3 and rotates. The centrifugal force of the rotating flow causes droplets in the EG mixed steam to accumulate on the inner surface of the separator 1. The accumulated droplets then flow under gravity into the liquid receiving tank 7. Through the tear holes 35 in the liquid receiving tank 7, they drip into the liquid collecting chamber 6 below, where they are recovered along with the EG washing liquid. The gas separated from the gas and liquid enters the steam jet vacuum pump unit through the gas outlet 15. The EG washing liquid and steam condensate collected in the liquid collecting chamber 6 enter the fine filter. After being filtered by the fine filter, the EG washing liquid is re-injected into the EG circulation pump, which pumps the EG washing liquid into the liquid inlet pipe 24 for recycling.

[0031] Example 2

[0032] like Figure 4 As shown, the extension pipe 22 of the scrubber 2 is configured as a structure consisting of two tapered pipes with large diameter ends relatively connected, one of the small diameter ends is connected to the connecting pipe 21, and the other small diameter end serves as an outlet for the scrubbing liquid.

[0033] The vacuum scrubber for a polyester plant includes a separator 1, a scrubber 2 disposed within the separator 1, and a dehumidifier 3 disposed within the separator 1 and connected to the scrubber 2. The separator 1 comprises a head 12, a cylindrical body 11, and a conical shell 13, which are connected in sequence. The head 12 has a central hole for the scrubber 2 to pass through. The cylindrical body 11 has an air outlet on its side, which is located near the end of the head 12. The conical shell 13 is a conical tube with a liquid collecting chamber 6 formed on its inner side. The liquid collecting chamber 6 is provided with a cross-shaped anti-vortex baffle 14. The large-diameter end of the conical shell 13 is connected to the cylindrical body 11, and the small-diameter end is a liquid outlet 16. The scrubber 2 includes a connecting pipe 21 and an extension pipe 22. The connecting pipe 21 is passed through the center hole and is sealed with the center hole. Part of the connecting pipe 21 is located on the outside of the separator 1, and part of it is located on the inside of the separator 1. One end located on the outside of the separator 1 is closed and passed through a liquid inlet pipe 24, and an air inlet 23 is provided on the side. The connecting pipe 21 is located on the inside of the separator 1 and is connected to the extension pipe 22 at one end; the extension pipe 22 is composed of two identical tapered tubes with relatively large diameters connected, one of which has a small diameter end connected to the connecting pipe 21, and the other small diameter end serves as the outflow outlet of the washing liquid. The water eliminator 3 includes a first cover tube 31 and a second cover tube 32 which are coaxially arranged and have different inner diameters. The second cover tube 32 is connected to the extension pipe 22 of the scrubber 2. A number of swirl blades 34 are evenly arranged between the first cover tube 31 and the second cover tube 32. The swirl blades 34 have a certain angle in the vertical direction and in the radial direction with the first cover tube 31. The number of swirl blades 34 can separate the gas passing through the water eliminator 3 into gas and liquid. The water eliminator 3 also includes a ring plate 33. The inner diameter of the ring plate 33 is slightly smaller than that of the first cover tube 31. The ring plate 33 is connected to one end of the first cover tube 31. A number of evenly arranged tear holes 35 are also provided on the ring plate 33. The outer diameter side of the ring plate 33 is connected to the inner side of the cylindrical body 11.

[0034] The inner side surfaces of the connecting tube 21 and the extension tube 22 form a washing chamber 4. Compared with the extension tube 22 structure in Example 1, the extension tube 22 structure in Example 2 allows for more complete contact between the gas and the washing liquid flowing through the inner side surface of the extension tube 22. The gas-liquid separation chamber is composed of the outer surface of the scrubber 2 located in the separation chamber, the inner surface of the separator 1, and the dehydrator 3. After the gas passes through the swirl blades 34, a rotating flow is generated. The liquid droplets in the gas are centrifuged and adhere to the inner surface of the separator 1 in the gas-liquid separation chamber. After the liquid droplets accumulate, they flow through the inner surface of the separator 1 under the action of gravity and fall into the liquid receiving tank 7. The gas after gas-liquid separation is discharged through the gas outlet 15 of the cylindrical body 11. The liquid receiving tank 7 is composed of the dehydrator 3 and the inner surface of the separator 1. The liquid dripping into the liquid receiving tank 7 is discharged through the tear hole 35 and enters the liquid collecting chamber 6. The liquid collecting chamber 6 is composed of the inner surface of the conical shell 13. A cross-shaped anti-vortex baffle 14 is provided in the liquid collecting chamber 6. The washing liquid and the liquid separated from the gas and liquid are collected by the liquid collecting chamber 6 and recycled through the liquid outlet 16.

[0035] The process is similar to that of the vacuum scrubber for polyester plants in Example 1. However, when the EG mixed vapor enters scrubbing chamber 4 and comes into contact with the atomized EG scrubbing liquid, it more fully contacts the inner surface of expansion tube 22. The two tapered tubes provide ample storage space for the EG mixed vapor entering expansion tube 22. As it flows toward the outlet of expansion tube 22, the diameter gradually decreases, concentrating the EG mixed vapor toward the outlet. This process increases the likelihood of contact between the EG mixed vapor and the EG scrubbing liquid. Subsequently, the gas-liquid separation in dehumidifier 3 further enhances the separation effect. The EG scrubbing liquid and the separated liquid are recovered and reused in liquid collection chamber 6.

[0036] The separation and recovery of ethylene glycol in the esterification reaction is very important. Providing a washing device after the spray condenser can ensure the effective implementation of subsequent processes. However, traditional spray-type washing devices have relatively poor washing effects and may affect the vacuum level of the air intake equipment. The vacuum washing device for a polyester device proposed in the present invention is small in size and simple in structure. The washing liquid and gas flow in the same direction, which reduces resistance and prolongs the contact time between the washing liquid and the gas. It also avoids the problem of the relative flow of the washing liquid and the gas affecting the vacuum level of the air intake equipment, and has practical significance for actual production. In addition to the above-mentioned embodiments, within the scope disclosed in the claims and the specification of the present invention, the technical features of the present invention can be reselected and combined to form new embodiments, which should also fall within the scope of protection of the present invention.

Claims

1. A vacuum cleaning device for a polyester device, characterized in that: The invention comprises a separator, a scrubber passing through the separator, and a water remover sleeved in the gap between the separator and the scrubber. The scrubber has a washing cavity, and the atomized liquid and gas flowing into the washing cavity have the same flow direction.

2. A vacuum cleaning device for a polyester device according to claim 1, characterized in that: The separator includes a cylindrical body having an upper end with an opening facing upward and a lower end with an opening facing downward. The separator also includes a head connected to the upper end of the body and a conical shell connected to the lower end of the body.

3. A vacuum cleaning device for a polyester device according to claim 2, characterized in that: An air outlet is provided on the side of the cylindrical body, and a center hole is provided on the head. The end with a larger inner diameter of the conical shell is connected to the cylindrical body, and the end with a smaller inner diameter of the conical shell is a liquid outlet. The inner surface of the cone can form a liquid collecting cavity, and an anti-vortex baffle is provided in the liquid collecting cavity.

4. A vacuum cleaning device for a polyester device according to claim 3, characterized in that: The scrubber includes a connecting pipe and an extension pipe. The connecting pipe is passed through the center hole. An air inlet is provided on the side of the connecting pipe located on the outside of the separator. One end of the connecting pipe located on the outside of the separator is closed and passed through a liquid inlet pipe. The liquid inlet pipe is connected to a nozzle. The nozzle is located on the inside of the scrubber. The extension pipe is a conical pipe. The end of the extension pipe with a smaller inner diameter is connected to the connecting pipe. The inner side surface of the connecting pipe and the inner side surface of the extension pipe constitute the washing chamber.

5. The vacuum cleaning device for a polyester device according to claim 1, characterized in that: The dehumidifier includes a first cover barrel and a second cover barrel, the first cover barrel and the second cover barrel are both cylindrical, the first cover barrel and the second cover barrel have the same height, the inner diameter of the first cover barrel is larger than the inner diameter of the second cover barrel, the first cover barrel and the second cover barrel are arranged with their axes coinciding, and the second cover barrel is connected to the scrubber. The dehumidifier also includes a plurality of swirl blades evenly arranged between the first cover barrel and the second cover barrel, the swirl blades have a certain angle in the vertical direction, and the swirl blades have a certain angle with the radial direction of the first cover barrel.

6. The vacuum cleaning device for polyester equipment according to claim 5, characterized in that: The dewatering device also includes a ring plate, which is in the shape of a circular ring. The inner diameter of the ring plate is smaller than the inner diameter of the first cover tube. The ring plate and the first cover tube are arranged to coincide with each other and are connected to each other. The outer diameter side of the ring plate is connected to the inner side of the separator. The ring plate is provided with a number of evenly arranged tear holes.

7. A vacuum cleaning device for a polyester device according to any one of claims 1 to 6, characterized in that: The inner side surface of the separator, the outer side surface of the scrubber located inside the separator and the water remover form a gas-liquid separation chamber.

8. The vacuum cleaning device for polyester equipment according to claim 7, characterized in that: The dehydrator and the inner side surface of the separator form a liquid receiving tank, and the liquid separated by the gas-liquid separation chamber enters the liquid receiving tank.

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