Defoaming device for polymer liquid

Abstract

The utility model belongs to the technical field of spinning solution production, and discloses a defoaming device for a polymer solution, which comprises a barrel, the bottom end of the discharging pipe is located in the cylinder body; the distributor is arranged below the bottom end of the discharging pipe, and the polymerization liquid flowing out of the discharging pipe falls on the distributor and flows towards the periphery of the distributor to be dispersed; and a variable cross-section dispersion channel which is narrowed and then widened along the flowing direction of the polymerization liquid is defined on the distributor. According to the utility model, after falling on the distributor, the polymer liquid flows out from the periphery of the distributor to realize the dispersion effect, and through the arrangement of the variable cross-section dispersion channel, the liquid flow of the polymer liquid has a deceleration buffer trend in an area with a larger channel width, flows in an accelerated manner along with the narrowing of the channel width, and is dispersed more uniformly along with the widening of the channel width; and the polymerization liquid flows out more uniformly in different directions of the distributor, so that the dispersion uniformity is improved, and the defoaming effect is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of spinning solution production, in particular to a degassing device for polymer solution. Background Art

[0002] Synthetic fibers are typically spun from a polymer-containing spinning solution, which is ejected through a spinneret. This spinning solution, also known as the polymer solution, can contain bubbles during the polymerization production or transportation process. Larger bubbles passing through the spinneret can cause interruptions, deformation, and breakage of the spinning stream. Smaller bubbles can pass through the spinneret and remain in the fiber, causing holes and brittle or broken fibers during drawing. Therefore, the polymer solution must be deaerated before use in spinning, otherwise the quality of the finished fiber will be affected.

[0003] Because polymer solutions typically have high viscosity, bubble removal presents a challenge. Existing techniques typically employ elevated temperature and reduced pressure to remove these bubbles. Increasing the temperature decreases the viscosity of the liquid, facilitating the escape of small gas molecules. Reduced pressure creates a difference between the liquid level and the internal pressure, similarly facilitating the expansion and diffusion of small bubbles.

[0004] Existing degassing equipment, such as degassing towers or kettles, typically features a packing layer inside, allowing the polymer solution to spread across the packing layer to form a thick layer. This layer is also controlled to maintain a negative pressure to release any remaining bubbles. However, the dispersion of the polymer solution across the packing layer is difficult to control, leading to uneven dispersion and consequently, poor degassing efficiency.

[0005] In view of this, the present utility model is proposed. Utility Model Content

[0006] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a degassing device for a polymeric liquid which can enhance the dispersion uniformity of the polymeric liquid and thus improve the degassing effect.

[0007] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0008] A degassing device for a polymer solution, comprising:

[0009] Cylinder;

[0010] A feed pipe, the bottom end of which is located inside the cylinder and is used to transport the polymer solution into the cylinder;

[0011] A distributor is provided below the bottom end of the feed pipe, and the polymer solution flowing out of the feed pipe falls on the distributor and flows toward the periphery of the distributor for dispersion;

[0012] The distributor is defined with a dispersion channel with a variable cross-section that first narrows and then widens along the flow direction of the polymer liquid.

[0013] Furthermore, the distributor comprises:

[0014] a distribution plate, horizontally arranged below the bottom end of the discharge pipe;

[0015] Stoppers are arranged on the upper side of the distribution plate and are spaced apart along the periphery of the distribution plate;

[0016] The polymer liquid flows toward the periphery on the distribution plate and flows out of the distributor through the gap between two adjacent blocks;

[0017] The stopper includes two first stoppers arranged opposite to each other, and the variable-section dispersion channel is formed between the two first stoppers.

[0018] Furthermore, the first block has the following parts connected in sequence along the flow direction of the polymer solution:

[0019] a first flow guide surface extending from the outer periphery of the distribution plate along the flow direction of the polymer solution and inclined toward the inner side of the distribution plate;

[0020] a second guide surface connected to the end of the first guide surface at a certain angle, extending along the flow direction of the polymer liquid and inclined toward the outer periphery of the distribution plate;

[0021] Along the flow direction of the polymer liquid, the width of the variable-cross-section dispersion channel gradually decreases between the two first guide surfaces and gradually increases between the two second guide surfaces.

[0022] Furthermore, the distribution plate is arranged close to the outer peripheral area of ​​the cylinder and has a certain extension length along the radial direction of the cylinder; the first stoppers are arranged on both sides of the distribution plate in the length direction.

[0023] Furthermore, the width of the distribution plate first increases and then decreases radially outward from the cylinder, and the first stopper is located at or substantially located at a position where the width of the distribution plate begins to decrease.

[0024] Furthermore, the stopper includes a second stopper, and the second stopper is arranged at an end of the distribution plate away from the central axis of the cylinder.

[0025] Furthermore, the stopper includes two third stoppers, which are arranged on both sides of the distribution plate in the length direction and extend along the outer periphery of the distribution plate;

[0026] The third stopper is closer to the central axis of the cylinder than the first stopper.

[0027] Furthermore, a plurality of liquid outlet holes are provided on the side wall of the feed pipe near the bottom end, and the polymer liquid in the feed pipe flows out from the liquid outlet holes to form a liquid seal covering the bottom end of the feed pipe.

[0028] Furthermore, a packing layer is provided in the cylinder below the distributor, and the polymer solution dispersed by the distributor falls on the packing layer;

[0029] From the upper end height of the packing layer downward, the inner diameter of the cylinder gradually or stepwise decreases.

[0030] Furthermore, a cleaning assembly is provided in the upper area of ​​the cylinder for spraying cleaning liquid into the interior of the cylinder for cleaning.

[0031] After adopting the above technical solution, the utility model has the following beneficial effects compared with the prior art.

[0032] In the utility model, the polymer liquid flowing out of the discharge pipe falls on the distributor, flows toward the periphery of the distributor and flows out, thereby achieving a dispersion effect. By setting a variable-section dispersion channel, the flow of the polymer liquid has a deceleration and buffering tendency in the area where the channel width is larger, and accelerates as the channel width narrows, and then disperses more evenly as the channel width widens, so that the polymer liquid flows out more evenly in different directions of the distributor, thereby improving the dispersion uniformity, and thus helping to improve the degassing effect.

[0033] In the present invention, the first stopper on the distribution plate has a first guide surface and a second guide surface that extend obliquely relative to the outer periphery of the distribution plate and are connected at a certain angle. A variable-cross-section dispersion channel whose width first gradually decreases and then gradually increases is formed through the first guide surface and the second guide surface, further improving the dispersion uniformity of the polymer liquid and reducing dead corners in the structure that are prone to gelling.

[0034] In the present invention, the second stopper is provided at the end of the distribution plate away from the central axis of the cylinder to redistribute the polymerization liquid, allowing it to be more evenly dispersed in the area near the outer periphery of the cylinder. The third stopper is provided to further evenly disperse the polymerization liquid in the area near the central axis of the cylinder, allowing the polymerization liquid to flow evenly in all directions from the outer periphery of the distribution plate.

[0035] In this utility model, a plurality of liquid outlet holes are provided on the side wall of the feed tube, so that during the outflow of the polymerization liquid, a liquid seal is formed around the bottom end of the feed tube, isolating the polymerization liquid inside the feed tube from direct contact with the gas inside the cylinder. The cylinder has a structure with a gradually decreasing inner diameter between the packing layer and the space below the packing layer, so that the volume gradually decreases from top to bottom. The gas inside the cylinder tends to diffuse from bottom to top, and contact with the polymerization liquid can effectively remove bubbles.

[0036] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For those skilled in the art, other drawings can be obtained based on these drawings without inventive work. In the drawings:

[0038] Figure 1 This is a schematic structural diagram of a degassing device in an embodiment of the present invention;

[0039] Figure 2 This utility model Figure 1 A magnified schematic diagram of point A in the middle;

[0040] Figure 3 It is a top view of the distributor in the embodiment of the present utility model.

[0041] In the figure: 100, cylinder; 101, negative pressure suction port; 102, discharge port; 121, first diameter reduction section; 122, second diameter reduction section; 123, third diameter reduction section; 131, first transition section; 132, second transition section; 140, tapered necking structure; 210, discharge pipe; 220, feed pipe; 221, feed port; 300, packing layer; 400, distributor; 410, distribution plate; 421, first stopper; 4211, first guide surface; 4212, second guide surface; 422, second stopper; 4221, third guide surface; 423, third stopper; 500, liquid seal; 600, cleaning component.

[0042] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0044] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0045] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0046] like Figures 1 to 3 As shown, an embodiment of the present invention provides a degassing device for a polymer solution.

[0047] As a specific implementation manner, the polymer solution is polyacrylonitrile spinning solution, and the degassing device provided in this embodiment is used for degassing the polyacrylonitrile spinning solution.

[0048] In this embodiment, the degassing device includes a cylinder 100. A feed pipe 210 is provided at the upper portion of the cylinder 100, the bottom end of which extends into the interior of the cylinder 100. The polymer solution to be degassed is fed into the cylinder 100 through the feed pipe 210. A distributor 400 is provided below the bottom end of the feed pipe 210, and a packing layer 300 is provided on the lower side of the distributor 400.

[0049] During the degassing process, a negative pressure environment is controlled to form inside the cylinder 100. Specifically, a negative pressure suction port 101 is provided near the top of the cylinder 100. This port is connected to a negative pressure system, which draws air from the cylinder 100 through the port 101, thereby creating a negative pressure environment inside the cylinder 100. More specifically, the port 101 is located on the side wall of the cylinder 100 and is higher than the upper end surface of the packing layer 300.

[0050] The polymerization liquid flows along the discharge pipe 210, flows out from the discharge end of the discharge pipe 210, falls on the distributor 400, and then flows to the periphery of the distributor 400 to disperse, flows out from the periphery of the distributor 400, and disperses on the upper end surface of the packing layer 300 to form a polymerization liquid film, which is in full contact with the gas phase. The bubbles therein escape from the polymerization liquid under a negative pressure environment, thereby achieving the purpose of degassing the polymerization liquid.

[0051] A discharge port 102 is provided at the lower end of the cylinder 100 . The polymer solution passing through the packing layer 300 falls to the bottom of the cylinder 100 , and further escapes the remaining bubbles during the falling process, and is finally discharged from the discharge port 102 .

[0052] In the above solution, due to the high viscosity of the polymer solution, it may not spread well to form a polymer solution film if it is directly dropped on the packing layer 300. By providing the distributor 400, the polymer solution can be dispersed before it contacts the packing layer 300, so that the polymer solution is distributed more evenly on the packing layer 300.

[0053] In order to ensure the dispersing effect of the distributor 400 on the polymer solution, this embodiment further adopts the following technical solution.

[0054] In this embodiment, distributor 400 defines a variable-cross-section dispersion channel that narrows and then widens along the flow direction of the polymer solution. As the polymer solution flowing from discharge pipe 210 lands on the upper surface of distributor 400 and flows outward, it first reaches the wider region of the variable-cross-section dispersion channel. Here, the polymer solution tends to slow down and buffer. As it continues to flow, the channel narrows, accelerating the flow. As the channel widens again, the solution disperses and evenly flows out from a wider area around distributor 400.

[0055] The setting of the variable-section dispersion channel is conducive to the more uniform flow of the polymer liquid in different directions of the distributor 400, thereby enhancing the dispersion effect of the distributor 400 on the polymer liquid, so that the polymer liquid can be more evenly spread on the upper end surface of the packing layer 300 after flowing out of the distributor 400, thereby improving the degassing effect.

[0056] In a further embodiment, distributor 400 includes a distribution plate 410 and baffles. Distribution plate 410 is horizontally positioned below the bottom end of feed tube 210, and baffles are positioned above distribution plate 410 and spaced apart along the periphery of distribution plate 410. The polymer solution flowing from feed tube 210 lands on the upper surface of distribution plate 410, flows toward the periphery of distribution plate 410, and exits distributor 400 through the spaces between adjacent baffles.

[0057] In this embodiment, the stopper includes at least two first stoppers 421 arranged opposite to each other, and the variable-cross-section dispersion channel is formed between the two first stoppers 421 .

[0058] As a specific embodiment, the first block 421 has a first guide surface 4211 and a second guide surface 4212 connected in sequence along the flow direction of the polymer solution. The first guide surface 4211 and the second guide surface 4212 are connected at a certain angle, thereby forming the variable cross-section dispersion channel between the two first blocks 421.

[0059] Specifically, the first guide surface 4211 extends from the outer periphery of the distribution plate 410 along the flow direction of the polymer solution and is inclined toward the inner side of the distribution plate 410. The second guide surface 4212 is connected to the end of the first guide surface 4211 (i.e. Figure 3 The first guide surface 4211 and the second guide surface 4212 are connected to each other (the right end in FIG), extend along the flow direction of the polymer solution and tilt toward the outer periphery of the distribution plate 410. An angle greater than 90° is formed between the first guide surface 4211 and the second guide surface 4212.

[0060] With this structure, the first block 421 is approximately a herringbone-shaped block. As the polymerized liquid flows along the upper side of the distribution plate 410, the width of the variable-cross-section dispersion channel gradually decreases between the two first guide surfaces 4211 and gradually increases between the two second guide surfaces 4212. The gradual change in the width of the variable-cross-section dispersion channel reduces the flow of the polymerized liquid, facilitating a more uniform outflow. Furthermore, compared to conventional devices with complex structures such as dispersion plates, this design reduces dead spots prone to gel formation.

[0061] In a further solution of this embodiment, the distributor 400 is disposed near the outer peripheral area of ​​the cylinder 100 .

[0062] As a specific solution, multiple feeding pipes 210 are provided, evenly distributed along the circumference of the cylinder 100. The number of distributors 400 is the same as that of the feeding pipes 210, and they are provided below the bottom end of each feeding pipe 210 in a one-to-one correspondence.

[0063] More specifically, a feed pipe 220 is provided above the cylinder 100, coaxial with the cylinder 100, and a feed port 221 is provided at the top of the feed pipe 220. A feed pipe 210 is connected to the side wall of the lower portion of the feed pipe 220, extends radially for a certain length, then bends downward and continues to extend, passing through the top wall of the cylinder 100 and extending into the interior of the cylinder 100.

[0064] It should be noted that Figure 1 Only one set of feed pipes 210 and distributors 400 is shown. However, in the actual structure, the lower portion of the feed pipe 220 is connected to a plurality of circumferentially distributed feed pipes 210, each of which extends into the interior of the cylinder 100, and a distributor 400 is provided below each feed pipe 210.

[0065] In this embodiment, the distribution plate 410 extends a certain length along the radial direction of the barrel 100, and first stops 421 are provided on both sides of the length of the distribution plate 410. The polymer solution flows from the discharge pipe 210 and lands on the distribution plate 410, where it flows and disperses toward the periphery of the distribution plate 410. Polymer solution flowing in a direction close to the radial direction of the barrel 100 passes through the variable-cross-section dispersion channel formed between the two first stops 421.

[0066] In a specific structure, the horizontal distance between the connection point of the first guide surface 4211 and the second guide surface 4212 and the central axis of the cylinder 100 is greater than the horizontal distance between the bottom end of the discharge pipe 210 and the central axis of the cylinder 100.

[0067] The variable-section dispersion channel has its narrowest width at the junction of the first guide surface 4211 and the second guide surface 4212. With the above structure, the polymer liquid flowing out of the discharge pipe 210 can fall on the distribution plate 410 at a position closer to the central axis of the cylinder 100 relative to the narrowest point of the variable-section dispersion channel. Then, when part of the polymer liquid flows on the distribution plate 410 in a direction away from the central axis of the cylinder 100, it can pass through the variable-section dispersion channel that first gradually narrows and then gradually widens, thereby achieving a more uniform dispersion effect.

[0068] In a further solution, the width of the distribution plate 410 first increases and then decreases radially outwardly of the cylinder 100 , and the first stopper 421 is located at or substantially located at a position where the width of the distribution plate 410 begins to decrease.

[0069] In one specific configuration, the distribution plate 410 is composed of an isosceles trapezoid and a semicircle or superior arc shape, wherein the straight side of the semicircle or superior arc shape coincides with the lower base of the isosceles trapezoid. The upper base of the isosceles trapezoid is located at one end near the central axis of the cylinder 100, while the other end of the semicircle or superior arc shape is located near the outer periphery of the cylinder 100. The width of the distribution plate 410 gradually increases from the upper base of the isosceles trapezoid to the lower base. After passing the center of the semicircle or superior arc shape along the radial direction of the cylinder 100, the width of the distribution plate 410 gradually decreases.

[0070] The first stopper 421 is basically arranged at the two ends of the lower base of the isosceles trapezoid, and the vertical downward projection of the bottom end of the discharge pipe 210 (such as Figure 3 The position where the spherical element (shown by the middle dotted line) falls on the distribution plate 410 is close to the center of the semicircle or superior arc.

[0071] Furthermore, the stopper on the upper side of the distribution plate 410 includes a second stopper 422 . The second stopper 422 is disposed at an end of the distribution plate 410 away from the central axis of the cylinder 100 .

[0072] The outer peripheral edge of the distribution plate 410 at one end away from the central axis of the cylinder 100 is an arc with a larger central angle, and a second stop block 422 is provided at the end portion, which can further disperse the flow of the polymer liquid at the end of the distribution plate 410 to flow out in two directions, thereby further enhancing the dispersion effect.

[0073] In a specific embodiment, the second stopper 422 is a herringbone-shaped stopper with a similar structure to the first stopper 421. Specifically, the second stopper 422 has two third guide surfaces 4221 connected at a predetermined angle on the side facing the central axis of the cylinder 100. The two third guide surfaces 4221 extend from the two ends of the second stopper 422 toward the middle and are inclined toward the other end of the distribution plate 410.

[0074] With this structure, when the polymerized liquid flows out from the gap between the first stopper 421 and the second stopper 422, it passes through the gradually narrowing channel formed by the second guide surface 4212 and the third guide surface 4221, which helps the liquid flow out from the periphery of the distribution plate 410 at a faster rate. This allows the outflowing polymerized liquid to spread more easily on the packing layer 300, forming a thinner liquid film, and achieving more thorough degassing.

[0075] In a further embodiment, the stoppers on the upper side of the distribution plate 410 further include two third stoppers 423, which are disposed on both sides of the distribution plate 410 in the longitudinal direction and extend along the outer circumference of the distribution plate 410. The third stoppers 423 are closer to the central axis of the barrel 100 than the first stoppers 421.

[0076] In a specific embodiment, the third stopper 423 is a flat plate, positioned on either side of the isosceles trapezoidal region of the distribution plate 410. The polymer solution flowing from the discharge pipe 210 onto the distribution plate 410 can partially disperse toward the central axis of the barrel 100, ultimately flowing out through the gap between the first stopper 421 and the third stopper 423. Another portion of the polymer solution can flow toward the end of the distribution plate 410, ultimately flowing out from the end of the distribution plate 410 closest to the central axis of the barrel 100.

[0077] In this embodiment, the first, second, and third stops 421, 422, and 423 are of substantially the same height. By rationally designing the shape of the distribution plate 410, and the shapes and positions of the first, second, and third stops 421, 422, 423 on the distribution plate 410 to match the position of the bottom end of the discharge tube 210 and the fluidity of the polymer solution, the polymer solution can be uniformly discharged in all directions on the distribution plate 410. This, in turn, allows the formation of a uniformly spread polymer solution film of substantially uniform thickness at all locations on the upper end surface of the packing layer 300, ensuring a degassing effect.

[0078] In a further embodiment of the present invention, the bottom end of the feed pipe 210 is spaced apart from the upper surface of the distribution plate 410. In a specific configuration, the distance between the bottom end of the feed pipe 210 and the distribution plate 410 is approximately 150 mm.

[0079] As the polymerized liquid flows from the feed tube 210 and lands on the distribution plate 410, a liquid seal 500 is formed around the bottom end of the feed tube 210. This liquid seal 500 prevents the polymerized liquid from directly interacting with the gas inside the cylinder 100 as it flows from the feed tube 210. Instead, the liquid seal 500 slowly descends and is dispersed onto the distributor 400.

[0080] If the above-mentioned liquid seal 500 is not formed, the solvent on the surface of the polymerization liquid will be quickly carried away at the outlet of the discharge pipe 210, becoming thick and difficult to flow, and gradually accumulating here in the form of a viscous gel. In severe cases, it will affect the outflow of subsequent polymerization liquid and further affect the normal degassing process.

[0081] As a specific embodiment, the side wall of the feed pipe 210 is provided with a plurality of liquid outlet holes in the area near the bottom end, and the polymer liquid in the feed pipe 210 flows out from the liquid outlet holes to form a liquid seal 500 covering the bottom end of the feed pipe 210.

[0082] Furthermore, distributor 400 is spaced apart from the upper end surface of packing layer 300. As a specific structure, a grid support is provided at a certain height above packing layer 300 to secure distributor 400. The polymer solution flowing out of the periphery of distributor 400 passes through the grid support and spreads out on the upper end surface of packing layer 300, forming a thin film of polymer solution.

[0083] In a further solution of this embodiment, the inner diameter of the cylinder 100 decreases gradually or step by step from the upper end height of the packing layer 300 downward.

[0084] As a specific embodiment, the middle and lower parts of the cylinder 100 are composed of a plurality of frustums arranged in sequence, thereby forming a structure with a gradually decreasing inner diameter.

[0085] In one specific structure, the cylinder 100 has a first diameter-reduced section 121, a second diameter-reduced section 122, and a third diameter-reduced section 123, arranged sequentially from top to bottom, wherein the packing layer 300 is disposed inside the first diameter-reduced section 121. The sidewalls of the diameter-reduced sections extend from top to bottom and are inclined toward the central axis of the cylinder 100, so that the inner diameter of the cylinder 100 gradually decreases within each diameter-reduced section.

[0086] Furthermore, the inner diameter of the lower end of the first diameter-reduced section 121 is greater than the inner diameter of the upper end of the second diameter-reduced section 122. The first diameter-reduced section 121 and the second diameter-reduced section 122 are connected by a first transition portion 131. The first transition portion 131 has a certain height, and its sidewalls are inclined from top to bottom toward the central axis of the barrel 100. The angle of inclination of the sidewalls of the first diameter-reduced section 131 relative to the vertical direction is greater than the angle of inclination of the sidewalls of the first diameter-reduced section 121 and the second diameter-reduced section 122 relative to the vertical direction.

[0087] Similarly, the inner diameter of the lower end of the second reduced diameter section 122 is greater than the inner diameter of the upper end of the third reduced diameter section 123. The second reduced diameter section 122 and the third reduced diameter section 123 are connected by a second transition portion 132. The second transition portion 132 has a certain height, and its sidewalls are inclined from top to bottom toward the central axis of the barrel 100. The angle of inclination of the sidewalls of the second transition portion 132 relative to the vertical direction is greater than the angle of inclination of the sidewalls of the second reduced diameter section 122 and the third reduced diameter section 123 relative to the vertical direction.

[0088] Furthermore, the lower end of the third diameter-reducing section 123 is connected to a tapered necking structure 140 whose inner diameter gradually decreases from top to bottom. The angle of inclination of the sidewall of the tapered necking structure 140 with the vertical direction is greater than the angle of inclination of the sidewall of the third diameter-reducing section 123 with the vertical direction. The lower end of the tapered necking structure 140 further extends downward to form the discharge port 102 of the barrel 100.

[0089] The degassing device of this embodiment adopts a conical design with a larger top and a smaller bottom in the internal space of the cylinder 100. Specifically, a three-fold closing structure is formed from top to bottom, which gradually compresses the volume. The negative pressure suction port 101 is set in an area higher than the packing layer 300. The gas flows from bottom to top in the cylinder 100 and can gradually diffuse inside the cylinder 100. Therefore, during the process of the polymer liquid passing through the packing layer 300 and falling from the packing layer 300, the gas inside the cylinder 100 can more fully contact the polymer liquid to remove residual bubbles. On the other hand, the above-mentioned structure of the cylinder 100 is also convenient for mechanical processing.

[0090] In a further embodiment of the present invention, a cleaning assembly 600 is provided in the upper region of the cylinder 100, and a cleaning liquid is sprayed into the cylinder 100 for cleaning by the cleaning assembly 600. The cleaning liquid is a mixture of water and a solvent used to prepare the polymerization liquid.

[0091] As a specific implementation, the solvent in the polymerization solution is DMSO, and the cleaning solution is a mixture of DMSO and a small amount of water.

[0092] Specifically, the nozzle of the cleaning assembly 600 is arranged in the cylinder 100 at a height higher than the distributor 400. Figure 1 Only some of the nozzles are shown in the figure. In an actual solution, a circle of nozzles can be set circumferentially inside the cylinder 100 to achieve an all-round cleaning effect.

[0093] By setting up the cleaning component 600, the interior of the cylinder 100 can be cleaned regularly, thereby removing the glue or other impurities on the inner wall of the cylinder 100, the surface of the distributor 400, and the grid skeleton support surface on the upper side of the packing layer 300, thereby improving the safety of the degassing device.

[0094] When the degassing device provided in this embodiment is used to degas the polymer liquid, the polymer liquid to be treated is injected from the feed port 221 at the top of the feed pipe 220, dispersed into multiple discharge pipes 210, and flows downward along the discharge pipes 210 into the cylinder 100.

[0095] The polymer liquid in the discharge pipe 210 flows out and falls on the distribution plate 410 below, flows toward the periphery of the distribution plate 410 and disperses, and is guided by multiple blocks to allow the polymer liquid to flow out evenly in all directions from the distribution plate 410, and then spread evenly on the packing layer 300 below, fully contacting with the gas phase.

[0096] The negative pressure suction port 101 is connected to a negative pressure system, creating a negative pressure environment within the cylinder 100. This negative pressure allows bubbles to escape from the expanded polymer solution film, achieving a degassing effect. After passing through the packing layer 300, the polymer solution falls to the bottom of the cylinder 100, where it comes into contact with the upward-flowing airflow that gradually diffuses as the inner diameter of the cylinder 100 changes, further removing any remaining bubbles. Finally, the degassed polymer solution can be discharged from the discharge port 102 at the bottom of the cylinder 100.

[0097] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with this patent can make slight changes or modifications to equivalent embodiments using the above-mentioned technical content without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. A degassing device for a polymer solution, characterized in that: include: Cylinder; A feed pipe, the bottom end of which is located inside the cylinder and is used to transport the polymer solution into the cylinder; A distributor is provided below the bottom end of the feed pipe, and the polymer solution flowing out of the feed pipe falls on the distributor and flows toward the periphery of the distributor for dispersion; The distributor is defined with a dispersion channel with a variable cross-section that first narrows and then widens along the flow direction of the polymer liquid.

2. The degassing device for a polymerization solution according to claim 1, wherein: The distributor comprises: a distribution plate, horizontally arranged below the bottom end of the discharge pipe; Stoppers are arranged on the upper side of the distribution plate and are spaced apart along the periphery of the distribution plate; The polymer liquid flows toward the periphery on the distribution plate and flows out of the distributor through the gap between two adjacent blocks; The stopper includes two first stoppers arranged opposite to each other, and the variable-section dispersion channel is formed between the two first stoppers.

3. The degassing device for polymerizing liquid according to claim 2, characterized in that: The first stopper comprises: a first flow guide surface extending from the outer periphery of the distribution plate along the flow direction of the polymer solution and inclined toward the inner side of the distribution plate; a second guide surface connected to the end of the first guide surface at a certain angle, extending along the flow direction of the polymer liquid and inclined toward the outer periphery of the distribution plate; Along the flow direction of the polymer liquid, the width of the variable-cross-section dispersion channel gradually decreases between the two first guide surfaces and gradually increases between the two second guide surfaces.

4. The degassing device for polymerizing liquid according to claim 3, characterized in that: The distribution plate is arranged close to the outer peripheral area of ​​the cylinder and has a certain extension length along the radial direction of the cylinder; the first stoppers are arranged on both sides of the distribution plate in the length direction.

5. The degassing device for polymerizing liquid according to claim 4, characterized in that: The width of the distribution plate increases first and then decreases radially outward from the cylinder, and the first stopper is located at or substantially at a position where the width of the distribution plate begins to decrease.

6. The degassing device for polymerizing liquid according to claim 5, characterized in that: The stopper includes a second stopper, which is arranged at an end of the distribution plate away from the central axis of the cylinder.

7. The degassing device for a polymer solution according to claim 4, wherein: The stopper includes two third stoppers, which are arranged on both sides of the distribution plate in the length direction and extend along the outer periphery of the distribution plate; The third stopper is closer to the central axis of the cylinder than the first stopper.

8. The degassing device for polymerizing liquid according to any one of claims 1 to 7, characterized in that: The side wall of the feed pipe is provided with a plurality of liquid outlet holes in an area near the bottom end, and the polymer liquid in the feed pipe flows out from the liquid outlet holes to form a liquid seal covering the bottom end of the feed pipe.

9. The degassing device for polymerizing liquid according to any one of claims 1 to 7, characterized in that: A packing layer is provided in the cylinder below the distributor, and the polymer solution dispersed by the distributor falls on the packing layer; From the upper end height of the packing layer downward, the inner diameter of the cylinder gradually or stepwise decreases.

10. The degassing device for a polymer solution according to any one of claims 1 to 7, characterized in that: A cleaning assembly is provided in the upper area of ​​the cylinder for spraying cleaning liquid into the interior of the cylinder for cleaning.

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