Defoaming device

Abstract

The utility model provides a defoaming device. The defoaming device comprises a kettle body, a kettle cover, a flow dividing mechanism and a flow guiding mechanism, a defoaming space is defined between the kettle cover and the kettle body; the flow dividing mechanism comprises a rotating shaft, a flow dividing surface connected to the bottom of the rotating shaft and a flow dividing piece arranged on the flow dividing surface, a first slit is formed between the flow dividing surface and the inner side wall of the kettle body, and a second slit is formed between partial structure of the flow dividing piece and the flow dividing surface; the flow guide mechanism comprises at least one flow guide piece, and a third slit is formed between part of the flow guide piece and the inner side wall of the kettle body. Through the arrangement of the rotatable flow dividing surface, power can be provided for flowing of a glue solution, meanwhile, defoaming treatment can be accelerated through the centrifugal effect, and the defoaming efficiency is improved. In addition, a first slit, a second slit and a third slit are also formed, so that the glue solution forms a film layer structure with uniform thickness in the flowing process, the problems of local accumulation and overlarge local thickness are avoided, and the defoaming uniformity is improved.

Description

Technical Field

[0001] The present application relates to the technical field of chemical equipment, and particularly to a defoaming device. Background Art

[0002] In chemical production, defoaming treatment is an extremely important treatment process, and the effect of defoaming treatment will have an important impact on the quality of the final product, etc. Polyamic acid is an important raw material for producing polyimide fiber, and the quality of polyamic acid has a key impact on the quality of polyimide fiber. Moreover, the quality of defoaming of polyamic acid solution has a more crucial impact on the quality of polyimide fiber. Bubbles will be formed during the stirring, filtering, and transmission of polyamic acid solution, and the bubbles will cause spinning interruption through the spinneret, resulting in broken filaments. Smaller bubbles will remain in the fiber, causing fiber defects and reducing the strength and elongation at break of the finished product. Ultimately, it affects the strength of polyimide fiber. Therefore, the bubbles in the polyamic acid stock solution must be completely removed before spinning. However, due to the high viscosity of the polyamic acid spinning stock solution, the defoaming treatment has certain difficulties, and the effect after defoaming treatment is not completely satisfactory.

[0003] Currently, the conventional defoaming methods in the production process of polyimide include atmospheric pressure static defoaming, vacuum static defoaming, etc. Both defoaming methods mostly adopt intermittent defoaming, and the glue solution is transferred to one or more defoaming tanks for static or vacuum defoaming. However, due to the high viscosity of the polyamic acid solution, there are problems such as long defoaming time, large floor area of equipment, and high production cost. At the same time, due to the degradation risk of the polyamic acid solution, continuous production cannot be carried out in the polymerization and spinning stages, and the stability of the fiber is also difficult to guarantee. Utility Model Content

[0004] To solve the above problems, the present application provides a defoaming device, which can improve the defoaming speed and efficiency of glue solutions such as polyamic acid.

[0005] To achieve the above object, the technical solution adopted by the present application is as follows:

[0006] The present application provides a degassing device, which includes a kettle body, a kettle cover, a flow splitting mechanism and a diversion mechanism. Define the center line of the kettle body as a preset straight line. A degassing space is formed by enclosing between the kettle cover and the kettle body. The center line of the kettle cover coincides with the preset straight line. The kettle cover is provided with a feed inlet and a rotating shaft interface, both of which penetrate through the kettle cover. The center line of the rotating shaft interface coincides with the preset straight line. The flow splitting mechanism includes a rotating shaft rotatably connected to the rotating shaft interface, a flow splitting surface connected to the bottom of the rotating shaft, and a flow splitting member provided on the flow splitting surface. The flow splitting surface is a rotating curved surface structure arranged around the preset straight line. A first slit is formed between the flow splitting surface and the inner side wall of the kettle body. The flow splitting member is an annular structure arranged around the preset straight line. A part of the flow splitting member is connected to the side of the flow splitting surface close to the kettle cover, and a second slit is formed between the remaining part of the flow splitting member and the flow splitting surface. The diversion mechanism is arranged below the flow splitting mechanism and includes at least one diversion member. The diversion member is an annular structure arranged around the preset straight line. The side of the diversion member close to the preset straight line is higher than the side away from the preset straight line. A part of the diversion member is connected to the side wall of the kettle body, and a third slit is formed between the remaining part of the diversion member and the inner side wall of the kettle body.

[0007] Further, define a plane where the preset straight line is located as a longitudinal section. The cross section obtained by intercepting the flow splitting surface with the longitudinal section is triangular or arc-shaped. The apex angle of the triangle is greater than or equal to 30° and less than or equal to 150°. The central angle corresponding to the arc is greater than or equal to 60° and less than or equal to 120°. Define a horizontal plane perpendicular to the preset straight line. The flow splitting surface has a flow splitting surface projection on the horizontal plane along the direction of the preset straight line. The diameter of the flow splitting surface projection is greater than or equal to 0.5 m and less than or equal to 2 m.

[0008] Further, the degassing device further includes a temperature control mechanism arranged outside the kettle body.

[0009] Further, the kettle cover is also provided with a vacuum port.

[0010] Further, the number of the feed inlets is set to 2 to 3, and the feed inlets are evenly arranged around the preset straight line.

[0011] Further, the degassing device further includes a feed pipe, and the feed pipe is connected to the feed inlet. The distance between the bottom of the feed pipe and the flow splitting surface along the direction of the preset straight line is greater than or equal to 20 mm and less than or equal to 100 mm.

[0012] Further, the dimension of the first slit in the direction perpendicular to the inner side wall of the kettle body is greater than or equal to 20 mm and less than or equal to 50 mm. The dimension of the second slit in the direction perpendicular to the flow splitting surface is greater than or equal to 0.5 mm and less than or equal to 10 mm. The dimension of the third slit in the direction perpendicular to the inner side wall of the kettle body is greater than or equal to 1 mm and less than or equal to 10 mm.

[0013] Furthermore, there are 1 to 5 flow splitting members provided on the flow splitting surface. The flow splitting members are distributed along the radial direction of the flow splitting surface, and the height of the flow splitting members is greater than or equal to 30 mm and less than or equal to 100 mm.

[0014] Furthermore, in the radial direction of the flow splitting surface, between adjacent flow splitting members, the second slit of the outer flow splitting member is narrower than the second slit of the inner flow splitting member.

[0015] Furthermore, the flow guiding mechanism includes 1 to 3 flow guiding members. The flow guiding members are distributed along a preset straight line direction on the inner side wall of the kettle body, and the height of the flow guiding members along the preset straight line direction is greater than or equal to 20 mm and less than or equal to 100 mm.

[0016] Furthermore, in the direction of the preset straight line, between adjacent flow guiding members, the third slit of the lower flow guiding member is narrower than the third slit of the upper flow guiding member.

[0017] In this application, by providing a rotatable flow splitting surface, it can provide power for the flow of the glue liquid. At the same time, it can also utilize the centrifugal force difference between the glue liquid and the bubbles under the centrifugal action generated during rotation to accelerate the defoaming process and improve the defoaming efficiency. In this application, a first slit is formed between the flow splitting surface and the inner side wall of the kettle body, a second slit is formed between the flow splitting member and the flow splitting surface, and a third slit is formed between the flow guiding member and the inner side wall of the kettle body. By using the first slit, the second slit, and the third slit, a film layer structure with uniform thickness is formed during the flow of the glue liquid, avoiding problems such as local accumulation and excessive local thickness, and improving the defoaming uniformity. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of a defoaming device in this application;

[0019] Figure 2 It is a schematic structural diagram of a kettle lid in the defoaming device of this application;

[0020] Figure 3 It is a schematic combined structural diagram of the kettle body, the kettle lid, and the flow splitting mechanism in the defoaming device of this application;

[0021] Figure 4 It is Figure 3 an enlarged schematic diagram of the structure at A in

[0022] Figure 5 It is a schematic combined structural diagram of the kettle body and the flow guiding mechanism in the defoaming device of this application;

[0023] Figure 6 It is Figure 5 an enlarged schematic diagram of the structure at B in

[0024] Figure 7Schematic diagram of the combined structure of the rotating shaft and a kind of flow dividing surface in the defoaming device of the present application;

[0025] Figure 8 Schematic diagram of the combined structure of the rotating shaft and another kind of flow dividing surface in the defoaming device of the present application;

[0026] Figure 9 Schematic diagram of a structure of another defoaming device in the present application;

[0027] Figure 10 Schematic diagram of a combined structure of the kettle cover, the feed pipe and the flow dividing surface in the defoaming device of the present application;

[0028] Figure 11 Schematic diagram of the combined structure of the first flow dividing part and the flow dividing surface in the defoaming device of the present application;

[0029] Figure 12 Schematic diagram of the combined structure of the second flow dividing part and the flow dividing surface in the defoaming device of the present application;

[0030] Figure 13 Schematic diagram of the combined structure of the third flow dividing part and the flow dividing surface in the defoaming device of the present application;

[0031] Figure 14 Schematic diagram of the combined structure of the fourth flow dividing part and the flow dividing surface in the defoaming device of the present application;

[0032] Figure 15 Schematic diagram of the combined structure of the first guiding part and the kettle body in the defoaming device of the present application;

[0033] Figure 16 Schematic diagram of the combined structure of the second guiding part and the kettle body in the defoaming device of the present application;

[0034] Figure 17 Schematic diagram of the combined structure of the third guiding part and the kettle body in the defoaming device of the present application;

[0035] Figure 18 Schematic diagram of the combined structure of the fourth guiding part and the kettle body in the defoaming device of the present application;

[0036] Figure 19 Schematic diagram of the combined structure of the fifth guiding part and the kettle body in the defoaming device of the present application.

[0037] In the figure: Defoaming device 100, kettle body 11, kettle cover 12, vacuum port 121, feed port 122, rotating shaft interface 123, feed pipe 124, flow dividing mechanism 13, rotating shaft 131, flow dividing surface 132, flow dividing part 133, first slit 134, second slit 135, guiding mechanism 14, guiding part 141, third slit 142, temperature control mechanism 15, preset straight line 101. Detailed implementation mode

[0038] In order to enable those skilled in the art to better understand the solution of this application, the technical solutions in the specific embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. In the description of this application, if a part has a central axis or a hollow chamber, the "inner side" of the part refers to the side of the part close to the central axis of the part or the side disposed inside the hollow chamber; the "outer side" of the part refers to the side of the part far from the central axis of the part.

[0039] The embodiment of this application provides a defoaming device 100, which can be used to remove bubbles in a glue solution with a relatively high viscosity, such as polyimide glue solution. As Figure 1 shown, the defoaming device 100 includes a kettle body 11, a kettle lid 12, a flow splitting mechanism 13 and a guiding mechanism 14. The kettle body 11 is the main body of the defoaming device 100. The kettle lid 12 can be connected to the top of the kettle body 11. The kettle body 11 and the kettle lid 12 can enclose to form a defoaming space. The defoaming treatment process in the defoaming device 100 is basically carried out in this defoaming space. The flow splitting mechanism 13 and the guiding mechanism 14 are respectively arranged in this defoaming space. The flow splitting mechanism 13 and the guiding mechanism 14 can control the flow rate of the glue solution and the thickness when the glue solution flows in the defoaming space, etc., so as to improve the defoaming efficiency and enhance the defoaming effect. The overall shape of the defoaming device 100 in the embodiment of this application is basically rotationally symmetrically arranged. For the convenience of subsequent description, the center line (which can also be called the rotation axis) of the defoaming device 100 arranged in this basic rotationally symmetric manner is defined as a preset straight line 101. At the same time, this preset straight line 101 also basically coincides with the center line of the kettle body 11 and the kettle body 11.

[0040] As Figure 2 shown, the kettle lid 12 is provided with a vacuum port 121, a feeding port 122 and a rotating shaft interface 123. The vacuum port 121 is used to connect to a vacuum generating device. After the vacuum generating device is connected to the vacuum port 121 and works, it can make a low-pressure environment or a vacuum environment be formed in the defoaming space. The feeding port 122 is used for feeding materials into the defoaming space. In actual use, materials can be directly fed through the feeding port 122, or corresponding feeding devices can be used to feed materials into the defoaming space through the feeding port. The number of feeding ports 122 on the kettle lid 12 can be set according to actual production requirements. One feeding port 122 can be set on the kettle lid 12, or multiple feeding ports 122 can be set on the kettle lid 12. The rotating shaft interface 123 is used to connect and place the rotating shaft 131. The rotating shaft interface 123 is basically located at the center of the kettle lid 12, and the center line of the rotating shaft interface 123 also basically coincides with the preset straight line 101.

[0041] As Figure 3As shown in the figure, the flow splitting mechanism 13 is arranged inside the kettle body 11. The flow splitting mechanism 13 is arranged close to the kettle cover 12. After the glue liquid enters the kettle body 11 from the feeding port 122, it is first processed by the flow splitting mechanism 13. The flow splitting mechanism 13 includes a rotating shaft 131, a flow splitting surface 132 and a flow splitting member 133. The rotating shaft 131 is arranged through the rotating shaft interface 123 or forms a rotational connection with the rotating shaft interface 123. One end of the rotating shaft 131 inside the kettle body 11 is connected to the flow splitting surface 132. One end of the rotating shaft 131 outside the kettle body 11 can be connected to a device such as a motor that can drive rotational motion. The rotating shaft 131 can drive the flow splitting surface 132 to perform rotational motion. The flow splitting surface 132 is a rotating curved surface structure arranged around a preset straight line 101. This rotating curved surface structure is basically a rotationally symmetric structure around the preset straight line 101. The middle position of the flow splitting surface 132 is higher, and the surrounding positions are lower. The height of the flow splitting surface 132 gradually decreases from the central position to the surrounding positions. As Figure 3 and Figure 4 shown, a first slit 134 is formed between the four peripheral edges of the flow splitting surface 132 and the inner side wall of the kettle body 11. This first slit 134 can control the thickness of the glue liquid flowing out from the periphery of the flow splitting surface 132. The flow splitting member 133 is arranged on the flow splitting surface 132. Some sites of the flow splitting member 133 are connected to the upper surface of the flow splitting surface 132. The remaining part of the flow splitting member 133 and the flow splitting surface 132 form a second slit 135. This second slit 135 can control the thickness of the glue liquid when it flows on the flow splitting surface 132. The flow splitting surface 132 in the embodiment of the present application can rotate under the drive of the rotating shaft 131. In the rotating state, by using the difference that the centrifugal force of the glue liquid is larger and the centrifugal force of the bubbles is smaller, the glue liquid and the bubbles are separated to a certain extent. At the same time, it can also drive the glue liquid through the second slit 135 and enter the subsequent processing process. In the rotating state, the glue liquid is also more likely to form a film. At the same time, the second slit 135 can reduce the film forming thickness of the glue liquid, reduce the defoaming time and improve the defoaming efficiency. In addition, it can be understood that in order to achieve flow splitting and control the thickness of the glue liquid when flowing, the flow splitting member 133 is arranged on the side of the feeding port 122 away from the preset straight line 101, so that the glue liquid entering the defoaming space through the feeding port 122 can be processed by the flow splitting member 133 and the thickness of the glue liquid when flowing can be controlled within a suitable range.

[0042] As Figure 5 shown, the guiding mechanism 14 is also arranged inside the kettle body 11. The guiding mechanism 14 is arranged below the flow splitting mechanism 13. After the glue liquid is processed by the flow splitting mechanism 13, it enters the guiding mechanism 14 for further processing. As Figure 5 and Figure 6As shown, the flow guiding mechanism 14 includes a flow guiding member 141, and the flow guiding member 141 is an annular structure arranged substantially around a preset straight line 101. Some positions of the flow guiding member 141 are connected to the inner side wall of the kettle body 11, and the remaining part of the flow guiding member 141 and the inner side wall of the kettle body 11 form a third slit 142 for controlling the thickness when the glue liquid flows.

[0043] As an alternative implementation, as Figure 3 shown in, define a plane where the preset straight line 101 is located as a longitudinal section, and use the longitudinal section to intercept the diversion surface 132 to obtain a cross section. The shape of the cross section is a triangle or an arc. As Figure 7 shown, the apex angle α of the triangle is greater than or equal to 30° and less than or equal to 150°. As Figure 8 shown, the central angle β corresponding to the arc is greater than or equal to 60° and less than or equal to 120°. In the embodiment of the present application, the diversion surface 132 can be a conical surface, and the diversion surface 132 can also be a spherical crown surface obtained by intercepting a spherical surface with a plane. When the diversion surface 132 in the embodiment of the present application is a conical surface, a longitudinal section is used to intercept the diversion surface 132 to obtain a triangle, and the apex angle α of the triangle is greater than or equal to 30° and less than or equal to 150°. When the shape of the conical diversion surface 132 is within the above range, the angle of the diversion surface 132 is neither too steep nor too flat. The diversion surface 132 can not only increase the flow velocity of the glue liquid and improve the defoaming efficiency, but also ensure the uniformity when the glue liquid flows and avoid the situation of glue liquid accumulation in some areas. When the diversion surface 132 in the embodiment of the present application is a spherical crown surface, a longitudinal section is used to intercept the diversion surface 132 to obtain an arc, and the central angle β corresponding to the arc is greater than or equal to 60° and less than or equal to 120°. Similarly, when the shape of the spherical crown diversion surface 132 is within the above range, the overall shape of the diversion surface 132 is neither too steep nor too flat. The diversion surface 132 can not only increase the flow velocity of the glue liquid and improve the defoaming efficiency, but also ensure the uniformity when the glue liquid flows and avoid the situation of glue liquid accumulation in some areas. In addition, the shape of the above cross section is not limited to the aforementioned triangle and arc, and the shape of the cross section can also be any polygon and curve symmetrically arranged about the preset straight line 101. Further, the apex angle α of the triangle is greater than or equal to 45° and less than or equal to 135°, and the central angle β corresponding to the arc is greater than or equal to 70° and less than or equal to 110°. Further still, the apex angle α of the triangle is greater than or equal to 60° and less than or equal to 120°, and the central angle β corresponding to the arc is greater than or equal to 80° and less than or equal to 100°. Of course, it should be understood that since the top of the diversion surface 132 needs to be connected to the rotating shaft 131, the diversion surface 132 in the present application is not a complete and / or accurate conical or spherical crown shape. In order to be adapted to the rotating shaft 131, the shape of the diversion surface 132 needs to be adjusted accordingly. The shape of the diversion surface 132 defined here is only the general overall shape.

[0044] As an alternative implementation, a horizontal plane perpendicular to the preset straight line 101 is defined, and the diversion surface 132 has a diversion surface projection on the horizontal plane along the direction of the preset straight line 101. As shown in Figure 7 the diameter of the shown diversion surface projection is greater than or equal to 0.5 m and less than or equal to 2 m. The above-mentioned diameter of the diversion surface projection defines the diameter of the diversion surface. When the diameter of the diversion surface 132 is within the above range, it can basically meet the production use requirements in various production environments. Further, the diameter of the diversion surface projection is greater than or equal to 0.75 m and less than or equal to 1.75 m. Even further, the diameter of the diversion surface projection is greater than or equal to 1 m and less than or equal to 1.5 m.

[0045] As an alternative implementation, as shown in Figure 9 the defoaming device 100 further includes a temperature control mechanism 15 provided outside the kettle body 11. The temperature control mechanism 15 can ensure that the defoaming space in the kettle body 11 can continuously maintain an appropriate defoaming temperature, and can also keep the adhesive liquid at an appropriate defoaming treatment temperature, improving the efficiency and effect of the defoaming treatment. The temperature control mechanism 15 can be any device that can keep the defoaming space in the kettle body 11 at an appropriate temperature. Specifically, the temperature control mechanism 15 can be an electric heating device or an electric cooling device, and the temperature control mechanism 15 can also be a chamber or channel provided for the circulation of temperature control media such as water or oil.

[0046] As an alternative implementation, the number of the feeding ports 122 is set to 2 or 3, and the feeding ports 122 are evenly arranged around the preset straight line 101. When the number of the feeding ports 122 is set to 1, the entire defoaming treatment can be achieved. However, for the case where the defoaming device 100 is relatively large or the defoaming treatment requirement is relatively large, multiple feeding ports 122 can be set to meet the actual production requirements. Setting the number of the feeding ports 122 to 2 or 3 and evenly arranging the feeding ports 122 around the preset straight line 101 can basically meet the production requirements in various situations, ensuring both sufficient feeding volume to ensure the full operation of the defoaming device 100 and avoiding excessive feeding volume that may cause the accumulation of the adhesive liquid in the defoaming device 100. The even arrangement of the feeding ports 122 can ensure that the adhesive liquid evenly falls on the diversion surface 132 after feeding, and can also make the adhesive liquid evenly distributed on the diversion surface 132, avoiding the accumulation of the adhesive liquid or uneven thickness of the adhesive liquid, and improving the efficiency and quality of defoaming.

[0047] As an alternative implementation, as shown in Figure 10As shown, the degassing device 100 further includes a feeding pipe 124, and the feeding pipe 124 is connected to the feeding port 122. The feeding pipe 124 penetrates and is fixed in the feeding port 122. The feeding pipe 124 is used to add the glue liquid into the degassing space, and at the same time can control the position and direction of the glue liquid entering the degassing space. Specifically, the feeding pipe 124 and the kettle lid 12 can be integrally formed, and the feeding pipe 124 is directly integrated at the position of the feeding port 122 of the kettle lid 12; the feeding pipe 124 can also be fixedly connected to the feeding port 122 by means of welding or the like; the feeding pipe 124 can also be in a detachable form. The detachable feeding pipe 124 is convenient for adjustment according to actual production requirements and can control the position and direction of the glue liquid entering the degassing space. The distance H1 between the bottom of the feeding pipe 124 and the flow dividing surface 132 along the direction of the preset straight line 101 is greater than or equal to 20 mm and less than or equal to 100 mm. Within the above distance range, it can not only ensure that the glue liquid can fall on the appropriate position of the flow dividing surface 132 after entering the degassing space, but also ensure that when the amount of the glue liquid entering is too large, the pipe orifice of the feeding pipe 124 will not be blocked by the accumulated glue liquid, ensuring the normal progress of the degassing treatment. Further, the distance H1 between the bottom of the feeding pipe 124 and the flow dividing surface 132 along the direction of the preset straight line 101 is greater than or equal to 30 mm and less than or equal to 90 mm. Still further, the distance H1 between the bottom of the feeding pipe 124 and the flow dividing surface 132 along the direction of the preset straight line 101 is greater than or equal to 40 mm and less than or equal to 80 mm.

[0048] As an alternative embodiment, the dimension W1 of the first slit 134 in the direction perpendicular to the inner wall of the kettle body 11 is greater than or equal to 20 mm and less than or equal to 50 mm (as Figure 2 shown), the dimension W2 of the second slit 135 in the direction perpendicular to the flow dividing surface 132 is greater than or equal to 0.5 mm and less than or equal to 10 mm (as Figure 4 shown), and the dimension W3 of the third slit 142 in the direction perpendicular to the inner wall of the kettle body 11 is greater than or equal to 1 mm and less than or equal to 10 mm (as Figure 6 shown). In the embodiments of the present application, the functions and purposes of setting the first slit 134, the second slit 135 and the third slit 142 are to control the thickness of the glue liquid when flowing during different process stages of the glue liquid degassing. The dimension of the above slit can also be understood as the dimension of the slit in the direction perpendicular to the flow direction of the glue liquid. The thickness of the glue liquid after flowing through the slit is not greater than the dimension of the slit. In the above stages, controlling the dimension of the corresponding slit within the above range can also control the thickness of the glue liquid flowing through the corresponding slit within the corresponding range, increasing the efficiency and effect of the degassing treatment.

[0049] As an alternative embodiment, the shape and setting direction of the flow splitter 133 can be designed and set according to actual requirements. The design and setting of the flow splitter 133 only need to meet the following conditions: First, the flow splitter 133 and the flow splitting surface 132 can cooperate to form a second slit 135; second, after the flow splitter 133 and the flow splitting surface 132 cooperate, the adhesive liquid needs to flow only through the position of the second slit 135. Specifically, the flow splitter 133 can be a straight plate-like structure with a cross-section as shown in Figure 11 . The angle between the flow splitter 133 with the cross-sectional straight plate-like structure and the flow splitting surface 132 can be set as needed. The flow splitter 133 can be set along the direction of the preset straight line 101 as shown in Figure 11 , or can be set at a certain angle with the flow splitting surface 132 as shown in Figure 12 . The flow splitter 133 can also be a curved surface-like structure with a cross-section as shown in Figure 13 . The positional relationship between the flow splitter 133 with the cross-sectional curved surface-like structure and the flow splitting surface 132 can be set in a convex form as shown in Figure 13 , or can be set in a concave form as shown in Figure 14 . It can be understood that the above structures are only partial examples of the specific shape of the flow splitter 133, and the shape of the flow splitter 133 is not limited to the above examples.

[0050] As an alternative embodiment, 1 to 5 flow splitters 133 are provided on the flow splitting surface 132. The flow splitters 133 are distributed along the radial direction of the flow splitting surface 132. The height H2 of the flow splitter 133 along the direction of the preset straight line 101 is greater than or equal to 30 mm and less than or equal to 100 mm (as shown in Figures 11 to 14 ). The flow splitter 133 needs to have a certain height to prevent the adhesive liquid from flowing over the top of the flow splitter 133 during flow and not passing through the second slit 135, resulting in a situation where the thickness is uncontrollable. Further, the height H2 of the flow splitter 133 along the direction of the preset straight line 101 is greater than or equal to 40 mm and less than or equal to 90 mm. Further still, the height H2 of the flow splitter 133 along the direction of the preset straight line 101 is greater than or equal to 50 mm and less than or equal to 80 mm.

[0051] As an alternative embodiment, in the radial direction of the flow splitting surface 132, between adjacent flow splitting members 133, the second slit 135 of the outer flow splitting member 133 is narrower than the second slit 135 of the inner flow splitting member 133. A plurality of flow splitting members 133 can be arranged on the flow splitting surface 132. When a plurality of flow splitting members 133 are arranged, the height of the second slit 135 between the flow splitting member 133 and the flow splitting surface 132 gradually decreases from the inside to the outside. The continuous decrease in the height of the second slit 135 can continuously reduce the thickness of the flowing glue. The continuous reduction of the glue thickness can, on the one hand, improve the defoaming effect by reducing the thickness of the glue, and on the other hand, in the form of continuous reduction, it can avoid situations such as glue accumulation caused by excessive sudden reduction in thickness.

[0052] As an alternative embodiment, the distance between the flow splitting member 133 closest to the preset straight line 101 on the flow splitting surface 132 and the preset straight line 101 is greater than the distance between the axis of the feed pipe 124 and the preset straight line 101. At this time, it can be ensured that the glue flowing out of the feed pipe 124 can pass between all the second slits 135. The distance between the axis of the feed pipe 124 and the preset straight line 101 is 50 - 1000 mm. Preferably, the distance between the axis of the feed pipe 124 and the preset straight line 101 is 50 - 500 mm. The distance between the flow splitting member 133 closest to the preset straight line 101 and the preset straight line 101 is 100 - 2000 mm. Preferably, the distance between the flow splitting member 133 closest to the preset straight line 101 and the preset straight line 101 is 300 - 2000 mm.

[0053] As an alternative embodiment, the shape and installation direction of the flow guiding member 141 can be designed and set according to actual needs. The design and setting of the flow guiding member 141 only need to meet the following conditions: firstly, the flow guiding member 141 and the inner side wall of the kettle body 11 can cooperate to form a third slit 142, and secondly, the flow guiding member 141 needs to be able to receive the glue falling from above and make the glue flow only through the position of the third slit 142. Specifically, the flow guiding member 141 can be a straight plate-like structure with an inclined cross-section as Figure 15 shown, and a structure with a large upper opening and a small lower third slit 142 is formed between the cross-sectional straight plate-like flow guiding member 141 and the inner side wall of the kettle body 11. The flow guiding member 141 can also be an "L"-shaped structure with a cross-section as shown in 16, and a vertical baffle is arranged on the side away from the inner side wall of the kettle body 11. The flow guiding member 141 can also be a structure formed by setting an inclined surface or an inclined curved surface on the aforementioned cross-sectional "L"-shaped structure as Figure 17 shown or as Figure 18 shown. The flow guiding member 141 can also be a curved surface-like structure with a cross-section as shown in 19. It can be understood that the above structures are only partial examples of the specific shape of the flow guiding member 141, and the shape of the flow guiding member 141 is not limited to the above examples.

[0054] As an alternative embodiment, the flow guiding mechanism 14 includes 1 to 3 flow guiding members 141, which are distributed on the inner side wall of the kettle body 11 along a preset straight line direction. The height H3 of the flow guiding member 141 along the preset straight line 101 is greater than or equal to 20 mm and less than or equal to 100 mm (as Figures 15 to 19 shown in). The flow guiding member 141 needs to have a certain height to receive the glue liquid and control the flow direction of the glue liquid, so as to prevent the glue liquid from not passing through the third slit 142 during flow, resulting in uncontrollable thickness. Further, the height H3 of the flow guiding member 141 along the preset straight line 101 is greater than or equal to 30 mm and less than or equal to 90 mm. Further still, the height H3 of the flow guiding member 141 along the preset straight line 101 is greater than or equal to 40 mm and less than or equal to 80 mm.

[0055] As an alternative embodiment, the gap between the lowermost part of the flow guiding mechanism 14 and the inner wall of the kettle body 11 in the preset straight line 101 direction is the third slit. There is also a gap between the uppermost part of the flow guiding mechanism 14 and the inner wall of the kettle body 11 in the preset straight line 101 direction. This is the opening gap of the flow guiding mechanism 14. The opening gap of the flow guiding mechanism 14 is greater than the dimension W1 of the first slit 134 in the direction perpendicular to the inner side wall of the kettle body 11. Preferably, the opening gap of the flow guiding mechanism 14 is 25 - 100 mm.

[0056] As an alternative embodiment, in the direction of the preset straight line 101, between adjacent flow guiding members 141, the third slit 142 of the lower flow guiding member 141 is narrower than the third slit 142 of the upper flow guiding member 141. Similarly, when multiple flow guiding members 141 are arranged on the inner side wall of the kettle body 11 along the preset straight line direction, the height of the third slit 142 between the flow guiding member 141 and the inner side wall of the kettle body 11 also gradually decreases from top to bottom, which can not only ensure the reduction of the glue liquid thickness and increase the defoaming efficiency, but also ensure that the glue liquid thickness is continuously decreasing, avoiding situations such as glue liquid accumulation.

[0057] To further illustrate the defoaming effect of the defoaming device 100 in the embodiments of the present application, the technical solutions and technical effects of the present application will be further described below in combination with specific embodiments.

[0058] Embodiment 1

[0059] The polyamic acid glue liquid with a viscosity of 10 Pa·s (at 25 °C) is filtered and then heated to 45 °C. The inner diameter of the defoaming device 100 is 1500 mm. The vacuum degree in the defoaming device 100 is maintained at 80 KPa, and the temperature in the defoaming device 100 is maintained at 45 °C. The glue liquid is injected into the defoaming device 100 through 2 feeding ports 122 at a total injection speed of 0.3 L / s.

[0060] A flow dividing surface 132 is arranged inside the degassing device. The distance between the bottom of the feed pipe 124 and the flow dividing surface 132 is 50 mm. The distance between the axis of the feed pipe 124 and the preset straight line 101 is 200 mm. The flow dividing surface 132 is conical, and the apex angle α of the cone is 120°. The bottom radius of the flow dividing surface 132 is 720 mm. The flow dividing surface 132 and the inner side wall of the kettle body 11 form a first slit 134. The dimension W1 of the first slit 134 in the direction perpendicular to the inner side wall of the kettle body 11 is 30 mm. The flow dividing surface 132 rotates at a speed of 40 rpm driven by the rotating shaft 131. Three sets of annular flow dividing members 133 are arranged on the flow dividing surface 132. From the inside to the outside, the heights H2 of the annular flow dividing members 133 are 80 mm, 50 mm, and 30 mm in sequence. A second slit 135 is formed between the annular flow dividing member 133 and the flow dividing surface 132. From the inside to the outside, the dimensions W2 of the second slits 135 in the direction perpendicular to the flow dividing surface 132 are 10 mm, 3 mm, and 1 mm in sequence. From the inside to the outside, the horizontal distance between the bottom edge of each annular flow dividing member 133 close to the flow dividing surface 132 and the preset straight line 101 is 470 mm, 620 mm, and 720 mm in sequence. At this time, the outermost annular flow dividing member 133 is located at the edge of the flow dividing surface 132.

[0061] The glue liquid is centrifuged and dispersed on the inner side wall of the kettle body 11 and flows downward along the inner side wall of the kettle body 11. Three sets of annular guide members 141 are arranged vertically on the inner side wall of the kettle body 11. From top to bottom, the annular guide members 141 are all Figure 16 the L-shaped guide members as shown. The heights H3 of the annular guide members 141 in the direction of the preset straight line 101 are 80 mm, 60 mm, and 60 mm in sequence. The lowest part of each annular guide member 141 in the direction of the preset straight line 101 and the inner side wall of the kettle body 11 form a third slit 142. The dimensions W3 of the third slits 142 in the direction perpendicular to the inner side wall of the kettle body 11 are 10 mm, 5 mm, and 2 mm in sequence. The horizontal distance between the highest part of each annular guide member 141 in the direction of the preset straight line 101 and the inner wall of the kettle body 11 is 50 mm. From top to bottom, the three sets of third slits 142 are respectively denoted as the first-stage third slit, the second-stage third slit, and the third-stage third slit. The height difference between the first-stage third slit and the first slit is 150 mm. The height difference between the second-stage third slit and the first-stage third slit is 150 mm. The height difference between the third-stage third slit and the second-stage third slit is 200 mm.

[0062] Example 2

[0063] The polyamic acid solution with a viscosity of 10 Pa·s (at 25 °C) is filtered and then heated to 45 °C. The inner diameter of the degassing device 100 is 1500 mm. The vacuum degree inside the degassing device 100 is maintained at 80 KPa, and the temperature inside the degassing device 100 is maintained at 45 °C. The solution is injected into the degassing device 100 through 2 feeding ports 122 at a total injection speed of 0.3 L / s.

[0064] A flow splitting surface 132 is arranged inside the degassing device. The distance between the bottom of the feeding pipe 124 and the flow splitting surface 132 is 50 mm. The distance between the axis of the feeding pipe 124 and the preset straight line 101 is 200 mm. The flow splitting surface 132 is conical, and the apex angle α of the cone is 120°. The flow splitting surface 132 and the inner side wall of the kettle body 11 form a first slit 134. The bottom radius of the flow splitting surface 132 is 720 mm. The dimension W1 of the first slit 134 in the direction perpendicular to the inner side wall of the kettle body 11 is 30 mm. The flow splitting surface 132 rotates at a speed of 40 rpm driven by the rotating shaft 131. Two sets of annular flow splitting members 133 are arranged on the flow splitting surface 132. From the inside to the outside, the heights H2 of the annular flow splitting members 133 are 80 mm and 30 mm in sequence. The annular flow splitting members 133 and the flow splitting surface 132 form a second slit 135. From the inside to the outside, the dimensions W2 of the second slits 135 in the direction perpendicular to the flow splitting surface 132 are 10 mm and 3 mm in sequence. From the inside to the outside, the distances between the bottom edges of the annular flow splitting members 133 close to the flow splitting surface 132 and the preset straight line 101 in the horizontal direction are 470 mm and 720 mm in sequence. At this time, the outermost annular flow splitting member 133 is located at the edge of the flow splitting surface 132.

[0065] The solution is centrifuged and dispersed on the inner side wall of the kettle body 11 and flows downward along the inner side wall of the kettle body 11. Two sets of annular guiding members 141 are arranged vertically on the inner side wall of the kettle body 11. From top to bottom, the annular guiding members 141 are all Figure 16 the L-shaped guiding members as shown. The heights H3 of the annular guiding members 141 in the direction of the preset straight line 101 are 80 mm and 60 mm in sequence. The lowest points of the annular guiding members 141 in the direction of the preset straight line 101 and the inner side wall of the kettle body 11 form a third slit 142. The dimensions W3 of the third slits 142 in the direction perpendicular to the inner side wall of the kettle body 11 are 10 mm and 5 mm in sequence. The distances between the highest points of the annular guiding members 141 in the direction of the preset straight line 101 and the inner side wall of the kettle body 11 are 50 mm. From top to bottom, the two sets of third slits 142 are respectively recorded as the first-stage third slit and the second-stage third slit. The height difference between the first-stage third slit and the first slit is 150 mm, and the height difference between the second-stage third slit and the first-stage third slit is 150 mm.

[0066] Comparative Example 1

[0067] In Comparative Example 1, the flow splitter 133 is not provided on the flow splitting surface 132, and other settings are the same as those in Example 1.

[0068] Comparative Example 2

[0069] In Comparative Example 1, the flow guiding mechanism 14 is not provided on the degassing device 100, and other settings are the same as those in Example 1.

[0070] Comparative Example 3

[0071] In the degassing device of Comparative Example 3, the above-mentioned flow splitting mechanism 13 and flow guiding mechanism 14 are not provided, and the degassing treatment is only carried out by vacuum degassing. The adhesive solution only undergoes static treatment in this degassing device and does not undergo additional flow treatment. The polyamic acid adhesive solution with a viscosity of 10 Pa·s (at 25 °C) is degassed in the degassing device. The inner diameter of this degassing device is 1500 mm, the vacuum degree in the degassing device 100 is maintained at 80 KPa, the temperature in the degassing device 100 of each device is maintained at 45 °C, and the adhesive solution is injected at a speed of 0.3 L / s.

[0072] Performance detection and results

[0073] Performance detection: After the adhesive solution is treated by the above-mentioned degassing devices in Examples 1 to 2 and Comparative Examples 1 to 3, the adhesive solution discharged from the bottom is taken, and the bubble state is checked under a strong flashlight. There are no obvious bubbles visible to the naked eye; for coating, the adhesive solution is blade-coated on the substrate to form a liquid film with a film thickness of 100 μm, and there are no hole defects with a size larger than 1 mm 2 is qualified. If the detection is unqualified, the above-mentioned degassing treatment is carried out again until the degassing is qualified.

[0074] Performance detection results

[0075] The performances of the above Examples 1 to 2 and Comparative Examples 1 to 4 are shown in Table 1 below

[0076] Table 1 Performance detection results

[0077] Number of cycles Defoaming time of 2000L glue solution / h Example 1 2 3.70 Example 2 3 5.56 Comparative Example 1 7 12.96 Comparative Example 2 8 14.81 Comparative Example 3 0 120

[0078] As can be seen from Table 1, the defoaming devices in Embodiment 1 and Embodiment 2 of the present application both have excellent defoaming effects. The defoaming devices in Embodiment 1 and Embodiment 2 can achieve qualified defoaming effects after three cycles of defoaming. By comparing Comparative Example 1 with Embodiment 1, it can be seen that setting a flow splitter on the flow splitting surface can greatly improve the defoaming efficiency. By comparing Comparative Example 2 with Embodiment 1, it can be seen that setting the diversion mechanism in the present application can significantly improve the defoaming efficiency. By comparing Comparative Example 3 with Embodiment 1, it can be seen that setting a diversion mechanism including an annular diversion groove can also significantly improve the defoaming efficiency. At the same time, the defoaming efficiency gain brought by setting a flow splitter on the flow splitting surface is slightly greater than the defoaming efficiency gain brought by setting the diversion mechanism in the present application. In addition, compared with simple vacuum defoaming treatment, the defoaming efficiency of the defoaming device in the present application is increased by 20 times or more.

[0079] Finally, it should be noted that the above are only some preferred embodiments of the present application and are not used to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A degassing device, characterized in that: include: A kettle body, wherein the center line of the kettle body is defined as a preset straight line; A kettle cover, wherein a degassing space is enclosed between the kettle cover and the kettle body, the center line of the kettle cover coincides with the preset straight line, the kettle cover is provided with a feed inlet and a rotating shaft interface, the feed inlet and the rotating shaft interface are both arranged through the kettle cover, and the center line of the rotating shaft interface coincides with the preset straight line; A flow dividing mechanism, wherein the flow dividing mechanism comprises a rotating shaft rotatably connected to the rotating shaft interface, a flow dividing surface connected to the bottom of the rotating shaft, and a flow dividing piece arranged on the flow dividing surface, wherein the flow dividing surface is a rotating curved surface structure arranged around the preset straight line, a first slit is formed between the flow dividing surface and the inner side wall of the kettle body, and the flow dividing piece is an annular structure arranged around the preset straight line, a part of the flow dividing piece is connected to a side of the flow dividing surface close to the kettle cover, and a second slit is formed between the remaining part of the flow dividing piece and the flow dividing surface; A flow guide mechanism, wherein the flow guide mechanism is arranged below the diverter mechanism, the flow guide mechanism includes at least one flow guide member, the flow guide member is an annular structure arranged around the preset straight line, the side of the flow guide member close to the preset straight line is higher than the side of the flow guide member away from the preset straight line, a part of the flow guide member is connected to the side wall of the kettle body, and a third slit is formed between the remaining part of the flow guide member and the inner wall of the kettle body.

2. The degassing device according to claim 1, characterized in that: A plane where the preset straight line is located is defined as a longitudinal section, and the diverter surface is intercepted with the longitudinal section to obtain a cross section, the cross section is in the shape of a triangle or an arc, the vertex angle of the triangle is greater than or equal to 30° and less than or equal to 150°, and the central angle corresponding to the arc is greater than or equal to 60° and less than or equal to 120°; a horizontal plane perpendicular to the preset straight line is defined, the diverter surface has a diverter surface projection on the horizontal plane along the direction of the preset straight line, and the diameter of the diverter surface projection is greater than or equal to 0.5m and less than or equal to 2m.

3. The degassing device according to claim 1, characterized in that: The degassing device also includes a temperature control mechanism arranged outside the kettle body, and the kettle cover is also provided with a vacuum port.

4. The degassing device according to claim 1, characterized in that: The number of the feed openings is set to 2 to 3, and the feed openings are evenly arranged around the preset straight line.

5. The degassing device according to claim 1, characterized in that: The degassing device also includes a feed pipe connected to the feed port; the distance between the bottom of the feed pipe and the diverter surface along the direction of the preset straight line is greater than or equal to 20 mm and less than or equal to 100 mm.

6. The degassing device according to claim 1, characterized in that: The dimension of the first slit in a direction perpendicular to the inner wall of the kettle body is greater than or equal to 20 mm and less than or equal to 50 mm, the dimension of the second slit in a direction perpendicular to the diverter surface is greater than or equal to 0.5 mm and less than or equal to 10 mm, and the dimension of the third slit in a direction perpendicular to the inner wall of the kettle body is greater than or equal to 1 mm and less than or equal to 10 mm.

7. The degassing device according to claim 1, characterized in that: One to five diverter elements are disposed on the diverter surface. The diverter elements are distributed along the radial direction of the diverter surface. The height of the diverter element is greater than or equal to 30 mm and less than or equal to 100 mm.

8. The degassing device according to claim 7, characterized in that: In the radial direction of the flow dividing surface, between adjacent flow dividing pieces, the second slit of the flow dividing piece located on the outer side is narrower than the second slit of the flow dividing piece located on the inner side.

9. The degassing device according to claim 1, characterized in that: The flow guiding mechanism comprises 1 to 3 flow guiding members, which are distributed on the inner side wall of the kettle body along a preset straight line direction, and the height of the flow guiding members along the preset straight line direction is greater than or equal to 20 mm and less than or equal to 100 mm.

10. The degassing device according to claim 9, characterized in that: In the direction of the preset straight line, between adjacent guide members, the third slit of the guide member located at the bottom is narrower than the third slit of the guide member located at the top.

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