Centrifugal scraper film evaporator capable of removing free amine of epoxy curing agent

Abstract

The utility model relates to the technical field of evaporation equipment, in particular to a centrifugal scraper film evaporator capable of removing free amine of an epoxy curing agent, which comprises an evaporation barrel, a driving component, a rotating shaft, a liquid bead baffle, a dispersion disc and a scraper, an inner cavity of the evaporation cylinder is provided with a steam cavity, a dispersion cavity and an evaporation cavity which are sequentially communicated from top to bottom; the liquid bead baffle, the dispersion disc and the scraper are arranged on the rotating shaft from top to bottom at intervals, the liquid bead baffle is located in the steam cavity, the dispersion disc is located in the dispersion cavity, the scraper assembly is located in the evaporation cavity, and the scraper is connected with the rotating shaft through a connecting assembly. The connecting seat is fixedly connected with the scraper, the connecting seat is slidably connected with the mounting seat, one end of the elastic element abuts against the connecting seat, the other end of the elastic element abuts against the mounting seat, a uniform and controllable liquid film is formed through combination of centrifugal force film forming and the elastic scraper, the gas-liquid exchange area is increased, and the evaporation efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of evaporation equipment technology, and in particular to a centrifugal scraped film evaporator that can remove free amines from epoxy curing agents. Background Technology

[0002] Polyamine curing agents are the main curing agents for epoxy resins. Most existing polyamine curing agents are modified small-molecule liquid amines to obtain curing agents with larger molecular weights. However, the small-molecule amines may not react completely, thus affecting the performance of the cured epoxy resin. Therefore, it is necessary to remove the small-molecule free amines. The traditional method for removing free amines is vacuum distillation, with thin-film evaporators being a commonly used high-efficiency evaporation device. Traditional scraped-film evaporators typically use gravity film formation. However, due to the strong interaction between free amines and the larger-molecule amine curing agents, conventional gravity film formation cannot effectively ensure the diffusion of free amines from the curing agent under negative pressure. Furthermore, problems such as uneven material distribution, difficulty in controlling film thickness, and the easy formation of liquid droplets can occur. The scraper assembly is often a rigid connection structure, which, after long-term use, is prone to wear and tear, resulting in poor adhesion to the inner wall of the evaporator, affecting heat transfer efficiency. Simultaneously, liquid droplets are often entrained at the amine vapor outlet, leading to unsatisfactory separation results. Utility Model Content

[0003] The technical problem to be solved by this utility model is: in order to overcome the problems of uneven material distribution, difficulty in controlling film thickness, and easy formation of liquid droplets in the existing scraped film evaporator which usually adopts the principle of gravity film formation, the scraped assembly is mostly a rigid connection structure, which is prone to wear after long-term use, resulting in poor adhesion to the inner wall of the evaporation cylinder and affecting the heat transfer efficiency, a centrifugal scraped film evaporator that can remove free amines of epoxy curing agent is provided.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a centrifugal scraped film evaporator that can remove free amines from epoxy curing agents, including an evaporation cylinder, a drive assembly, a rotating shaft, a liquid droplet baffle, a dispersion disk, and a scraper. The evaporation cylinder has an inner cavity, and the inner cavity of the evaporation cylinder has a steam chamber, a dispersion chamber, and an evaporation chamber connected sequentially from top to bottom. The rotating shaft is arranged in the inner cavity of the evaporation cylinder and is rotatably connected to the evaporation cylinder. The output end of the drive assembly is connected to the rotating shaft. The evaporation cylinder has an amine vapor outlet connected to the steam chamber, a feed inlet connected to the dispersion chamber, and a discharge outlet connected to the bottom of the evaporation chamber. A jacket is arranged on the outside of the evaporation cylinder. The jacket and the evaporation cylinder enclose a heating chamber. The heating chamber is arranged around the evaporation chamber. The jacket has a heat source inlet and a heat source outlet connected to the heating chamber.

[0005] Liquid droplet baffles, dispersion discs, and scrapers are arranged at intervals from top to bottom on the rotating shaft. The liquid droplet baffles are located in the vapor chamber, the dispersion discs are located in the dispersion chamber, and the scraper assembly is located in the evaporation chamber. The scrapers are connected to the rotating shaft via a connecting assembly, which includes a mounting base, a connecting seat, and an elastic element. The mounting base is arranged on the rotating shaft, and the connecting seat and the scraper are fixedly connected and slidably connected. One end of the elastic element abuts against the connecting seat, and the other end abuts against the mounting seat. Through centrifugal force, the elastic element forms a film that combines with the elastic scraper to form a uniform and controllable liquid film, thereby improving evaporation efficiency. Furthermore, the cooperation between the connecting seat and the mounting seat ensures the connection strength between the scraper and the rotating shaft.

[0006] To address the problem of insufficient pressure from a single elastic element, a connecting assembly is further included, comprising a pressure-applying seat and a linkage rod. The pressure-applying seat is located above the mounting base, and one end of the linkage rod is rotatably connected to the connecting seat, while the other end is rotatably connected to the pressure-applying seat. Through the lever principle, the scraper pressure is increased, achieving dynamic pressure compensation and forming a uniform liquid film.

[0007] To address the problem of insufficient pressure from a single elastic element, the pressure seat is further equipped with a through hole for the shaft to pass through.

[0008] To address the issue of the pressure seat affecting the coaxiality of the rotating shaft, the system further includes a limiting part protruding from the connecting seat, a sliding cavity on the mounting seat, the limiting part being slidably arranged within the sliding cavity, and the size of the limiting part being larger than the size of the sliding cavity opening.

[0009] It further includes a cone-shaped structure in the lower part of the steam chamber that tapers inward from top to bottom.

[0010] To address the issue of vapor entrainment of liquid droplets, the design further includes a guide surface on the bottom of the liquid droplet baffle that slopes downwards from the center outwards, with the amine vapor outlet located above the liquid droplet baffle.

[0011] To address the issue of shaft bottom wobbling, the design further includes a stabilizing assembly connecting the shaft bottom to the evaporator. The stabilizing assembly includes a stabilizing base and a fixing block. The fixing block is fixedly connected to the inner wall of the evaporator, and the stabilizing base is rotatably connected to the shaft. The bottom surface of the stabilizing base has a fixing groove that matches the fixing block, and the fixing block is located within the fixing groove.

[0012] To address the problem of the flexible-connected scraper being difficult to insert into the evaporator and resulting in low installation efficiency, the scraper is further equipped with a guide surface that tapers inward from top to bottom on its bottom surface.

[0013] The beneficial effects of this utility model are: This utility model provides a centrifugal scraped film evaporator that can remove free amines from epoxy curing agents. By combining centrifugal force to form a film with an elastic scraper, a uniform and controllable liquid film is formed, which increases the gas-liquid exchange area and improves the evaporation efficiency. Furthermore, the cooperation between the connecting seat and the mounting seat can ensure the connection strength between the scraper and the rotating shaft. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a utility model Figure 1 A magnified structural diagram of point A in the middle.

[0017] In the diagram: 1. Evaporation cylinder, 11. Steam chamber, 12. Dispersion chamber, 13. Evaporation chamber, 14. Amine vapor outlet, 15. Feed inlet, 16. Discharge outlet, 17. Vacuum buffer tank;

[0018] 2. Driver components;

[0019] 3. Shaft;

[0020] 4. Liquid droplet baffle; 41. Guide surface;

[0021] 5. Dispersed plate;

[0022] 6. Scraper, 61. Inlet surface,

[0023] 7. Jacket; 71. Heating chamber; 72. Heat source inlet; 73. Heat source outlet;

[0024] 8. Connecting component; 81. Mounting base; 811. Sliding cavity; 82. Connecting base; 821. Limiting part; 83. Elastic element; 84. Pressure seat; 841. Through hole; 85. Linkage rod.

[0025] 9. Stabilizing component; 91. Stabilizing base; 911. Fixing slot; 92. Fixing block. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0027] like Figure 1This is a schematic diagram of the structure of the present invention. A centrifugal scraped film evaporator capable of removing free amines from epoxy curing agents includes an evaporation cylinder 1, a drive assembly 2, a rotating shaft 3, a liquid droplet baffle 4, a dispersion disk 5, and a scraper 6. The evaporation cylinder 1 has an inner cavity, and the inner cavity of the evaporation cylinder 1 has a steam chamber 11, a dispersion chamber 12, and an evaporation chamber 13 connected sequentially from top to bottom. The rotating shaft 3 is arranged in the inner cavity of the evaporation cylinder 1 and is rotatably connected to the evaporation cylinder 1. The output end of the drive assembly 2 is connected to the rotating shaft 3. The evaporation cylinder 1 has an amine vapor outlet 14 connected to the steam chamber 11, a feed inlet 15 connected to the dispersion chamber 12, and a discharge outlet 16 connected to the bottom of the evaporation chamber 13. A jacket 7 is arranged on the outside of the evaporation cylinder 1. The jacket 7 and the evaporation cylinder 1 enclose a heating chamber 71, which is arranged around the evaporation chamber 13. The jacket 7 has a heat source inlet 72 and a heat source outlet 73 connected to the heating chamber 71.

[0028] A centrifugal scraped film evaporator capable of removing free amines from epoxy curing agents is mainly used for the rapid removal of free amines from epoxy curing agents.

[0029] The evaporator also includes a vacuum buffer tank 17, and the amine vapor outlet 14 is connected to the vacuum buffer tank 17. In another embodiment, the amine vapor outlet 14 is connected to a negative pressure power source, and the amine vapor is condensed and recovered through vacuum negative pressure extraction.

[0030] like Figure 2 As shown, the liquid droplet baffle 4, the dispersion disk 5, and the scraper 6 are arranged at intervals from top to bottom on the rotating shaft 3. The liquid droplet baffle 4 is located in the vapor chamber 11, and the dispersion disk 5 is located in the dispersion chamber 12. The centrifugal force field generated by the dispersion disk 5 reduces the initial liquid film thickness. The scraper 6 assembly is located in the evaporation chamber 13. The scraper 6 is connected to the rotating shaft 3 through the connecting assembly 8. The connecting assembly 8 includes a mounting base 81, a connecting base 82, and an elastic element 83. The mounting base 81 is arranged on the rotating shaft 3. The connecting base 82 and the scraper 6 are fixedly connected, and the connecting base 82 and the mounting base 81 are slidably connected. One end of the elastic element 83 abuts against the connecting base 82, and the other end abuts against the mounting base 81. Through centrifugal force, the film is formed and combined with the elastic scraper 6 to form a uniform and controllable liquid film, improving the evaporation efficiency. The cooperation between the connecting base 82 and the mounting base 81 can ensure the connection strength between the scraper 6 and the rotating shaft 3.

[0031] like Figure 2 As shown, the connecting component 8 includes a pressure seat 84 and a linkage rod 85. The pressure seat 84 is located above the mounting base 81. One end of the linkage rod 85 is rotatably connected to the connecting base 82, and the other end is rotatably connected to the pressure seat 84. Through the lever principle, the pressure of the scraper 6 is increased, thereby increasing the tightness between the scraper 6 and the evaporator 1. The linkage rod 85 converts the speed signal into a pressure signal, thereby increasing the pressure.

[0032] like Figure 2As shown, the pressure seat 84 has a through hole 841 for the rotating shaft 3 to pass through.

[0033] like Figure 2 As shown, a limiting part 821 protrudes from the connecting seat 82, and a sliding cavity 811 is provided on the mounting seat 81. The limiting part 821 is slidably arranged in the sliding cavity 811, and the size of the limiting part 821 is larger than the size of the opening of the sliding cavity 811, to prevent the scraper 6 from accidentally falling off, limit the sliding stroke, and ensure operational reliability.

[0034] The lower part of the steam chamber 11 has a cone-shaped structure that tapers inward from top to bottom, which can reduce material residue at the bottom.

[0035] like Figure 2 As shown, the bottom surface of the liquid droplet baffle 4 has a guide surface 41 that slopes downward from the center to the surrounding area. The amine vapor outlet 14 is located above the liquid droplet baffle 4, which solves the problem of vapor entrainment of liquid droplets. The guide surface 41 can guide the liquid droplets to the cone-shaped part of the evaporation chamber 13, so that the liquid droplets contact the inner wall of the evaporation cylinder 1 and evaporate rapidly again when flowing through the evaporation chamber 13.

[0036] like Figure 2 As shown, the bottom of the rotating shaft 3 is connected to the evaporator cylinder 1 through the stabilizing component 9. The stabilizing component 9 includes a stabilizing seat 91 and a fixing block 92. The fixing block 92 is fixedly connected to the inner wall of the evaporator cylinder 1, and the stabilizing seat 91 is rotatably connected to the rotating shaft 3. The bottom surface of the stabilizing seat 91 has a fixing groove 911 that matches the fixing block 92. The fixing block 92 is located in the fixing groove 911, which eliminates the bottom swing of the rotating shaft 3. The cooperation between the fixing block 92 and the fixing groove 911 of the stabilizing seat 91 enables quick assembly and disassembly, improving installation efficiency.

[0037] like Figure 2 As shown, the bottom surface of the scraper 6 has an inwardly tapering guide surface 61 that tapers from top to bottom, so that when the scraper 6 is installed into the evaporator cylinder 1, the scraper 6 can taper inward, making it easier to install directly into the evaporator cylinder 1 and improving installation efficiency.

[0038] Working process: The material enters the dispersion chamber 12 through the feed inlet, and after being centrifugally atomized by the high-speed rotating dispersion disc 5, it is evenly distributed on the inner wall of the evaporation cylinder 1 and flows into the evaporation chamber 13. The scraper 6 rotates under the drive of the rotating shaft 3, and maintains a constant contact pressure with the evaporation cylinder 1 through the elastic element 83, scraping the material into a uniform film of 0.1-0.5mm. A heat medium of 120-200℃ is introduced into the jacket 7, and heat transfer and evaporation are carried out through the cylinder wall. The generated secondary steam rises and is separated by collision with the liquid droplet baffle 4. The dry steam is discharged from the top amine vapor outlet 14 through vacuum negative pressure. The concentrated liquid slides down the cavity wall to the discharge port 16. The bottom stabilizing component 9 of the rotating shaft 3 automatically centers during operation to ensure system stability.

[0039] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A centrifugal scraped-film evaporator capable of removing free amines from epoxy curing agents, characterized in that, The system includes an evaporator (1), a drive assembly (2), a rotating shaft (3), a liquid droplet baffle (4), a dispersion disc (5), and a scraper (6). The evaporator (1) has an inner cavity, which, from top to bottom, has a steam chamber (11), a dispersion chamber (12), and an evaporation chamber (13) connected sequentially. The rotating shaft (3) is arranged in the inner cavity of the evaporator (1) and is rotatably connected to the evaporator (1). The output end of the drive assembly (2) is drively connected to the rotating shaft (3). The cylinder (1) has an amine vapor outlet (14) communicating with the vapor chamber (11), a feed inlet (15) communicating with the dispersion chamber (12), and a discharge outlet (16) communicating with the bottom of the evaporation chamber (13). A jacket (7) is arranged on the outside of the evaporation cylinder (1). The jacket (7) and the evaporation cylinder (1) enclose a heating chamber (71). The heating chamber (71) is arranged around the evaporation chamber (13). The jacket (7) has a heat source inlet (72) and a heat source outlet (73) communicating with the heating chamber (71). The liquid droplet baffle (4), the dispersion disk (5), and the scraper (6) are arranged at intervals from top to bottom on the rotating shaft (3). The liquid droplet baffle (4) is located in the steam chamber (11), the dispersion disk (5) is located in the dispersion chamber (12), and the scraper (6) assembly is located in the evaporation chamber (13). The scraper (6) is connected to the rotating shaft (3) through a connecting assembly (8). The connecting assembly (8) includes a mounting base (81), a connecting base (82), and an elastic element (83). The mounting base (81) is arranged on the rotating shaft (3). The connecting base (82) and the scraper (6) are fixedly connected. The connecting base (82) and the mounting base (81) are slidably connected. One end of the elastic element (83) abuts against the connecting base (82), and the other end abuts against the mounting base (81).

2. The centrifugal scraped-film evaporator capable of removing free amines from epoxy curing agents as described in claim 1, characterized in that: The connecting assembly (8) includes a pressure seat (84) and a linkage rod (85). The pressure seat (84) is located above the mounting base (81). One end of the linkage rod (85) is rotatably connected to the connecting base (82), and the other end is rotatably connected to the pressure seat (84).

3. A centrifugal scraped-film evaporator capable of removing free amines from epoxy curing agents as described in claim 2, characterized in that: The pressure seat (84) has a through hole (841) for the shaft (3) to pass through.

4. A centrifugal scraped-film evaporator capable of removing free amines from epoxy curing agents as described in claim 2, characterized in that: The connecting seat (82) has a protruding limiting part (821), and the mounting seat (81) has a sliding cavity (811). The limiting part (821) is slidably arranged in the sliding cavity (811), and the size of the limiting part (821) is larger than the size of the opening of the sliding cavity (811).

5. A centrifugal scraped-film evaporator capable of removing free amines from epoxy curing agents as described in claim 1, characterized in that: The lower part of the steam chamber (11) has a cone-shaped structure that contracts inward from top to bottom.

6. A centrifugal scraped-film evaporator capable of removing free amines from epoxy curing agents as described in claim 1, characterized in that: The bottom surface of the liquid droplet baffle (4) has a guide surface (41) that slopes downward from the center to the surrounding area, and the amine vapor outlet (14) is located above the liquid droplet baffle (4).

7. A centrifugal scraped-film evaporator capable of removing free amines from epoxy curing agents as described in claim 1, characterized in that: The bottom of the rotating shaft (3) is connected to the evaporator (1) via a stabilizing component (9). The stabilizing component (9) includes a stabilizing seat (91) and a fixing block (92). The fixing block (92) is fixedly connected to the inner wall of the evaporator (1). The stabilizing seat (91) is rotatably connected to the rotating shaft (3). The bottom surface of the stabilizing seat (91) is provided with a fixing groove (911) that matches the fixing block (92). The fixing block (92) is located in the fixing groove (911).

8. A centrifugal scraped-film evaporator capable of removing free amines from epoxy curing agents as described in claim 1, characterized in that: The bottom surface of the scraper (6) has an inlet surface (61) that tapers inward from top to bottom.

9. A centrifugal scraped-film evaporator capable of removing free amines from epoxy curing agents as described in claim 1, characterized in that: The evaporator also includes a vacuum buffer tank (17), which is connected to the amine vapor outlet (14).

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