Device for rapidly removing small molecular substances in liquid well of polyester production system

Abstract

A polyester production system liquid well small molecule substance rapid removing device comprises a first filtering mechanism and further comprises a second filtering mechanism, the second filtering mechanism comprises a box body, a box cover is arranged at the top end of the box body, an ultrafiltration membrane assembly is arranged in the box body, a rotating shaft is arranged in the box body below the ultrafiltration membrane assembly, and a plurality of material stirring plates are arranged on the rotating shaft. A first motor is arranged on the outer side of the box body, a power output shaft of the first motor is in transmission connection with the rotating shaft, the bottom end of the box body is connected with a liquid outlet of the first filtering mechanism through a pipeline, and a sewage draining exit is formed in the lower end of the left side of the box body; a water storage tank is arranged on the right side of the box body, and the upper end of the water storage tank is connected to the upper end of the right side of the box body through a pipeline; a discharging opening is formed in the bottom end of the right side of the water storage tank, a second high-pressure pump is arranged at the discharging opening, and a positive-negative pressure pump is arranged on the right side of the liquid storage tank and connected to the upper end of the liquid storage tank through a pipeline. The device is simple in structure and convenient to use.

Description

Technical Field

[0001] This utility model belongs to the field of polyester production technology, and in particular relates to a device for rapid removal of small molecule substances from liquid wells in a polyester production system. Background Art

[0002] Polyester is a general term for polymers obtained by polycondensation of polyols and polyacids. It mainly refers to polyethylene terephthalate (PET), and conventionally also includes linear thermoplastic resins such as polybutylene terephthalate (PBTE) and polyarylate. It is a type of engineering plastic with excellent performance and a wide range of applications. Polyester requires a filtration mechanism during its production process to filter out small molecules from the polyester production system's liquid wells. Existing mechanisms mostly filter out some particulate matter through the filtration mechanism, requiring the use of an ultrafiltration membrane mechanism to filter out small molecules. However, over long periods of use, a large number of small molecules will accumulate on one side of the ultrafiltration membrane, which will clog the membrane and reduce the filtration effect. Furthermore, the long-term accumulation of small molecules will adhere to the inner wall of the filter box, making it difficult to remove. Therefore, in the existing technology, it is inconvenient to remove small molecules during polyester production. Utility Model Content

[0003] To address the technical problems of inconvenient handling of small molecules and low filtration efficiency of existing polyester production processes, this utility model provides a rapid removal device for small molecules in a liquid well of a polyester production system. The device includes a first filtration mechanism for filtering larger particles during polyester production. The first filtration mechanism has an inlet at its upper left side and an outlet at its lower right side. The first filtration mechanism includes a vertically arranged housing with a detachable cover at its top. Inside the housing, from top to bottom, are arranged a first filter screen, a second filter screen, and an activated carbon layer. The mesh size of the first filter screen is larger than that of the second filter screen. The inlet is located at the upper left side of the housing, and the outlet is located at the lower right side. A first high-pressure pump is located on the left side of the housing and is connected to the inlet via a pipeline. It also includes a second filtration mechanism for filtering small molecules during polyester production. The second filtration mechanism includes a vertically arranged box with a detachable, sealing cover at the top. An ultrafiltration membrane assembly is installed inside the box, and a horizontally arranged rotating shaft is located below the ultrafiltration membrane assembly. Both ends of the rotating shaft can be rotatably mounted on the inner wall of the box. Several material-dispensing plates are installed on the rotating shaft, evenly spaced around the circumference of the rotating shaft. A first motor is located on the outside of the box, and the power output shaft of the first motor is connected to the rotating shaft. The bottom of the box is connected to the outlet of the first filtration mechanism through a pipe, and a drain outlet is located at the lower left side of the box. When the first motor is started, it drives the material-dispensing plates to rotate via the rotating shaft. The material-dispensing plates disperse and mix the small molecules blocked by the ultrafiltration membrane assembly inside the lower part of the box, preventing excessive accumulation of small molecules at the lower part of the ultrafiltration membrane and improving filtration efficiency. A water storage tank is located on the right side of the tank. The upper end of the water storage tank is connected to the upper right side of the tank via a pipe. A discharge port is located at the bottom right side of the water storage tank. Inside the storage tank, there is a scraping mechanism for removing material from the inner wall of the storage tank. The scraping mechanism includes a vertically arranged support shaft. The lower end of the support shaft is rotatably mounted on the bottom inside the storage tank. A vertically arranged second motor is located at the top of the storage tank. The power output shaft of the second motor extends downward into the inside of the storage tank and is connected to the upper end of the support shaft. Two symmetrically arranged support rods are fixed at both the upper and lower ends of the support shaft. A vertically arranged scraper is fixed between the upper and lower support rods. The scraper is slidably connected to the inner wall of the storage tank. When the second motor is started, it drives the scraper to rotate through the support shaft. The scraper removes the material accumulated on the inner wall of the storage tank, reducing the amount of material adhering to the inner wall of the storage tank. A second high-pressure pump is provided at the discharge port, and positive and negative pressure pumps are provided on the right side of the liquid storage tank. The positive and negative pressure pumps are connected to the upper end of the liquid storage tank through pipes. The setting of the positive and negative pressure pumps can extract the gas inside the liquid storage tank. Under the action of negative pressure, the filtration efficiency of the ultrafiltration membrane assembly can be improved.

[0004] Preferably, the feeding plate is rectangular and its length is less than that of the rotating shaft.

[0005] Preferably, the feeding plate has several liquid passage holes for liquid to pass through, which can quickly disperse aggregated small molecules.

[0006] Preferably, a pressure gauge is provided on the top of the liquid storage tank.

[0007] The above solution has the following advantages:

[0008] The setting of the first filtering mechanism can remove particulate debris in the polyester production process, and prevent these particulate debris from entering the second filtering mechanism and clogging the ultrafiltration membrane component; the setting of the rotating shaft and the stripper plate, the first motor drives the stripper plate to rotate through the rotating shaft, and the stripper plate breaks up the small molecular substances blocked by the ultrafiltration membrane component and mixes them at the lower end of the inner part of the box body, avoiding excessive accumulation of small molecular substances at the lower end of the ultrafiltration membrane, thereby improving the filtration efficiency; the setting of the liquid storage tank and the positive and negative pressure pumps can extract the air in the liquid storage tank, so that negative pressure is generated in the liquid storage tank, thereby improving the filtration efficiency; the setting of the scraper mechanism, the scraper plate removes the material accumulated on the inner wall of the liquid storage tank, reducing the amount of material adhering to the inner wall of the liquid storage tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural diagram of the utility model;

[0010] Figure 2 for Figure 1 Magnified view of part A.

[0011] Figure numerals: 1. first filtering mechanism; 2. second filtering mechanism; 3. rotating shaft; 4. liquid storage tank; 5. scraper mechanism; 6. positive and negative pressure pumps; 11. housing; 12. cover; 13. first filter screen; 14. second filter screen; 15. activated carbon layer; 16. first high-pressure pump; 21. housing; 22. cover; 23. ultrafiltration membrane assembly; 24. sewage outlet; 31. first motor; 32. feed plate; 33. liquid hole; 41. pressure gauge; 42. second high-pressure pump; 51. support shaft; 52. second motor; 53. support rod; 54. scraper plate. DETAILED DESCRIPTION

[0012] like Figure 1-2As shown, a device for quickly removing small molecular substances from liquid wells of a polyester production system includes a first filter mechanism 1 for filtering larger particles in the polyester production process, a liquid inlet is provided at the upper left end of the first filter mechanism 1, and a liquid outlet is provided at the lower right end of the first filter mechanism 1, the first filter mechanism 1 includes a vertically arranged shell 11, a cover body 12 is detachably fixed to the top of the shell 11, a first filter screen 13, a second filter screen 14 and an activated carbon layer 15 are sequentially arranged in the shell 11 from top to bottom, the mesh size of the first filter screen 11 is larger than the mesh size of the second filter screen 12, the liquid inlet is located at the upper left end of the shell 11, the liquid outlet is located at the lower right end of the shell 11, a first high-pressure pump 16 is provided on the left side of the shell 11, and the first high-pressure pump 16 is connected to the liquid inlet through a pipeline. The second filter mechanism 2 is further comprised of a vertically arranged box body 21, a removable sealing cover 22 being provided on the top of the box body 21, an ultrafiltration membrane assembly 23 being provided inside the box body 21, a horizontally arranged rotating shaft 3 being provided in the box body 21 below the ultrafiltration membrane assembly 23, both ends of the rotating shaft 3 being rotatably assembled on the inner wall of the box body 21, a plurality of material-diverting plates 32 being provided on the rotating shaft 3, and the material-diverting plates 32 being evenly spaced around the rotating shaft 3 in the circumferential direction, and a first motor 31 being provided on the outer side of the box body 21. The power output shaft of the first motor 31 is transmission-connected with the rotating shaft 3. The bottom end of the box body 21 is connected to the liquid outlet of the first filter mechanism 1 through a pipeline, and a sewage outlet 24 is provided at the lower left end of the box body 21. The sewage outlet 24 is provided to facilitate the discharge of liquid mixed with small molecular substances. The first motor 31 is started, and the first motor 31 drives the material stripping plate 32 to rotate through the rotating shaft 3. The material stripping plate 32 breaks up the small molecular substances blocked by the ultrafiltration membrane assembly 23 and mixes them at the lower end of the inner part of the box body 21, so as to avoid excessive accumulation of small molecular substances at the lower end of the ultrafiltration membrane 23 and improve the filtration efficiency. The top of the liquid storage tank 4 is provided with a second vertically arranged motor 52, and the power output shaft of the second motor 52 extends downward to the interior of the liquid storage tank 4 and is transmission-connected with the upper end of the support shaft 51. A vertically arranged scraper 54 is fixed between the upper and lower support rods 53, and the scraper 54 is slidingly connected to the inner wall of the liquid storage tank 4. When the second motor 52 is started, the second motor 52 drives the scraper 5 to rotate through the support shaft 51, and the scraper 5 removes the material accumulated on the inner wall of the liquid storage tank 4, reducing the amount of material adhering to the inner wall of the liquid storage tank 4.A second high-pressure pump 42 is provided at the discharge port, and a positive and negative pressure pump 6 is provided on the right side of the liquid storage tank 4. The positive and negative pressure pumps 6 are connected to the upper end of the liquid storage tank 4 through a pipeline. The setting of the positive and negative pressure pumps 6 can extract the gas inside the liquid storage tank 4. Under the action of negative pressure, the filtration efficiency of the ultrafiltration membrane assembly 23 can be improved.

[0013] Preferably, the stripping plate 32 is rectangular and has a length smaller than the rotating shaft 3 .

[0014] Preferably, the material-diverting plate 32 is provided with a plurality of liquid-passing holes 33 for liquid to pass through, so as to quickly disperse the aggregated small molecular substances.

[0015] Preferably, a pressure gauge 41 is provided at the top of the liquid storage tank 4 .

[0016] Usage process:

[0017] When the utility model is in use, the filtered polyester solution containing more small molecular substances is transported to the housing 11 through the first high-pressure pump 16, and then filtered through the first filter 13 and the second filter 14, and the particulate impurities are blocked by the first filter 13 and the second filter 14; the positive and negative pressure pumps 6 are started, and the positive and negative pressure pumps 6 extract the air in the liquid storage tank 4, so that a negative pressure environment lower than the atmospheric pressure is generated in the liquid storage tank 4, and then the first motor 31 and the second motor 52 are started respectively, and the first motor 31 drives the material plate 32 to rotate through the rotating shaft 3, and the material plate 32 blocks the small molecules The substances are broken up and mixed at the lower end of the inner part of the box body 21 to avoid excessive accumulation of small molecular substances at the lower end of the ultrafiltration membrane 23, thereby improving the filtration efficiency. The polyester solution in the box body 21 is filtered through the ultrafiltration membrane 23 and enters the liquid storage tank 4. At this time, the second motor 52 drives the scraper plate 5 to rotate through the support shaft 51. The scraper plate 5 removes the materials accumulated on the inner wall of the liquid storage tank 4, reducing the materials adhering to the inner wall of the liquid storage tank 4. When the materials in the liquid storage tank 4 need to be discharged, the liquid storage tank 4 is inflated by the positive and negative pressure pumps 6, and the second high-pressure pump 42 is started. The second high-pressure pump 42 extracts the materials in the liquid storage tank 4 and discharges them.

[0018] In the description of the present invention, it should be understood that the terms "up", "down", "left", "right", "top", "bottom", "horizontal", "vertical", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0019] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention falls within the scope of protection of the present invention.

Claims

1. A device for quickly removing small molecular substances from a liquid well of a polyester production system, comprising a first filtering mechanism for filtering larger particles in a polyester production process, a liquid inlet being provided at the upper left end of the first filtering mechanism, and a liquid outlet being provided at the lower right end of the first filtering mechanism, characterized in that: The invention also includes a second filtering mechanism for filtering small molecular substances in the polyester production process, the second filtering mechanism includes a vertically arranged box body, a box cover for sealing is detachably provided on the top of the box body, an ultrafiltration membrane assembly is arranged inside the box body, a horizontally arranged rotating shaft is arranged in the box body below the ultrafiltration membrane assembly, both ends of the rotating shaft can be rotatably assembled on the inner wall of the box body, a plurality of material shifting plates are arranged on the rotating shaft, and the material shifting plates are arranged at even intervals around the rotating shaft, a first motor is arranged on the outside of the box body, a power output shaft of the first motor is transmission-connected to the rotating shaft, the bottom end of the box body is connected to the liquid outlet of the first filtering mechanism through a pipeline, and a sewage outlet is provided at the lower left end of the box body, a water storage tank is provided on the right side of the box body, the upper end of the water storage tank is connected to the upper right end of the box body through a pipeline, a discharge outlet is provided at the bottom right end of the water storage tank, and a second high-pressure pump is provided at the discharge outlet, positive and negative pressure pumps are provided on the right side of the liquid storage tank, and the positive and negative pressure pumps are connected to the upper end of the liquid storage tank through pipelines.

2. The device for rapidly removing small molecule substances from liquid wells of a polyester production system according to claim 1, characterized in that: The first filter mechanism includes a vertically arranged shell, a cover body is detachably fixed to the top of the shell, and a first filter screen, a second filter screen and an activated carbon layer are arranged in the shell from top to bottom. The mesh size of the first filter screen is larger than the mesh size of the second filter screen.

3. The device for rapidly removing small molecule substances from liquid wells of a polyester production system according to claim 2, characterized in that: The liquid inlet is located at the upper left end of the shell, the liquid outlet is located at the lower right end of the shell, and a first high-pressure pump is provided on the left side of the shell, which is connected to the liquid inlet through a pipeline.

4. The device for rapidly removing small molecule substances from liquid wells of a polyester production system according to claim 1, characterized in that: The stripping plate is rectangular and its length is shorter than the rotating shaft.

5. The device for rapidly removing small molecule substances from liquid wells of a polyester production system according to claim 4, characterized in that: The material-diverting plate is provided with a plurality of liquid-passing holes for liquid to pass through.

6. The device for rapidly removing small molecule substances from liquid wells of a polyester production system according to claim 1, characterized in that: A scraper mechanism is provided in the liquid storage tank for clearing materials from the inner wall of the liquid storage tank. The scraper mechanism includes a vertically arranged support shaft, the lower end of the support shaft can be rotatably assembled on the inner bottom end of the liquid storage tank, a vertically arranged second motor is provided on the top of the liquid storage tank, a power output shaft of the second motor extends downward to the interior of the liquid storage tank and is transmission-connected to the upper end of the support shaft, two symmetrically arranged support rods are fixed to the upper and lower ends of the support shaft, a vertically arranged scraper plate is fixed between the upper and lower support rods, and the scraper plate is slidably connected to the inner wall of the liquid storage tank.

7. A device for rapidly removing small molecule substances from a liquid well of a polyester production system according to claim 6, characterized in that: A pressure gauge is provided on the top of the liquid storage tank.

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