A uniform liquid feeding device of an aqueous polyurethane reactor

Abstract

The utility model discloses a kind of uniform liquid adding devices of waterborne polyurethane reaction kettle, it is related to waterborne polyurethane production equipment technical field.The device includes tank body, motor and speed reducer unit, first liquid pump, pipe fitting, second liquid pump, first atomization component, second atomization component and transmission assembly, pipe fitting is inner and outer coaxial double-layer pipe structure, rotate by motor and speed reducer unit drive, first atomization component is communicated with pipe fitting back liquid passage, for spraying the solution extracted in tank body bottom cavity, second atomization component is communicated with liquid ring cavity, for spraying water or solvent in response, transmission assembly drives second shaft sleeve relative pipe fitting reverse rotation, and the nozzle of two groups of atomization components is directly opposite arrangement.The utility model solves the problem of local concentration too high caused by existing liquid adding mode, reaction is not uniform etc., by two-way rotation atomization injection and stirring synergistic effect, realize water or solvent and the efficient uniform mixing of reaction system, improve product quality stability, with remarkable practical value.

Description

Technical Field

[0001] This utility model belongs to the technical field of waterborne polyurethane production equipment, specifically relating to a uniform liquid addition device for a waterborne polyurethane reactor. Background Technology

[0002] In the production process of waterborne polyurethane, the reactor is the core production equipment. Usually, water or solvent needs to be added to the reactor in the later stage of the reaction to adjust the viscosity and solid content of the reaction system, so as to ensure the smooth progress of subsequent production processes and the product quality meets the standards.

[0003] In existing technologies, water or solvents are often added to the reactor directly through a single inlet, such as via a pipe or nozzle from the top or side wall. However, this traditional method of adding liquids has significant drawbacks: because water or solvent is injected directly and centrally, it can easily lead to excessively high concentrations in localized areas within the reactor, resulting in uneven distribution of components in the reaction system. This, in turn, causes problems such as uneven reaction and localized gelation, ultimately leading to fluctuations in product performance, decreased quality, and severely impacting production efficiency and product qualification rates.

[0004] Therefore, there is an urgent need for a technical solution that can achieve uniform addition of water or solvent to overcome the shortcomings of existing technologies. Utility Model Content

[0005] To address the problems of excessively high local concentrations, uneven reactions, and unstable product quality in existing waterborne polyurethane reactor addition methods, this invention provides a uniform addition device for waterborne polyurethane reactors. By optimizing the addition structure and mixing method, it achieves efficient and uniform mixing of water or solvent with the reaction system, ensuring stable reaction and improving product quality.

[0006] This utility model is implemented as follows: a uniform liquid addition device for an aqueous polyurethane reactor, comprising: The tank serves as the reaction vessel; The motor and reducer unit, together with the first liquid pump, are fixed to the top of the tank via a mounting bracket; The fitting is a double-layered pipe with coaxial inner and outer sections. The lower end of the inner pipe is connected to the bottom cavity of the tank, and the upper end is rotatably connected to the inlet pipe of the first liquid pump through a rotary joint. The lower end of the outer pipe is closed, and the upper end is open and rotatably connected to a first shaft outer sleeve fixed to the bottom of the mounting frame. The outlet pipe of the first liquid pump is connected to the first shaft outer sleeve. A partition is fixed between the inner and outer pipes of the fitting. A return liquid channel is formed above the partition between the inner and outer pipe cavities of the fitting. A second shaft outer sleeve is rotatably connected to the outside of the fitting. A sealing plate is rotatably connected between the second shaft outer sleeve and the fitting. A liquid filling ring cavity is formed below the sealing plate between the second shaft outer sleeve and the fitting. The second liquid pump is fixed to the top surface of the tank. The inlet pipe of the second liquid pump is used to introduce reaction water or solvent. The outlet pipe of the second liquid pump is fixed to the sealing plate and communicates with the liquid addition ring cavity. The first atomizing component is fixed to the outside of the pipe and communicates with the return liquid channel; The second atomizing component is fixed outside the outer sleeve of the second shaft and communicates with the liquid filling ring cavity; The transmission assembly is used to drive the second shaft outer sleeve to rotate in the opposite direction relative to the tube.

[0007] Preferably, both the first atomizing component and the second atomizing component include an annular tube, on which a plurality of atomizing nozzles are distributed at equal angles, and a plurality of support tubes are radially connected to the inner side of the annular tube.

[0008] Preferably, the support tube of the first atomizing component is fixed to the outer tube of the fitting and communicates with the return liquid channel, and the support tube of the second atomizing component is fixed to the outer sleeve of the second shaft and communicates with the liquid filling ring cavity.

[0009] Preferably, the atomizing nozzle of the first atomizing component sprays upwards, and the atomizing nozzle of the second atomizing component sprays downwards and is directly opposite the atomizing nozzle of the first atomizing component.

[0010] Preferably, a first gear is fixed at the output end of the motor and reducer unit, and a second gear is fixed on the top outer side of the pipe fitting, with the first gear meshing with the second gear.

[0011] Preferably, the transmission assembly includes a third gear, which is fixed outside the pipe and located inside the second shaft outer sleeve above the sealing plate. A gear ring is fixed inside the second shaft outer sleeve. A rotating shaft is provided between the third gear and the gear ring. The upper end of the rotating shaft is rotatably connected to the tank body. A fourth gear is fixed at the lower end of the rotating shaft. The fourth gear meshes with the third gear and the gear ring.

[0012] Preferably, the portion of the tube located below the first atomizing component has several uniformly arranged stirring blades fixed on it.

[0013] Compared with related technologies, the uniform liquid addition device for an aqueous polyurethane reactor provided by this utility model has the following beneficial effects: 1. This utility model adopts two sets of annular atomizing components with a bidirectional rotating structure. The upper second atomizing component atomizes water or solvent and sprays it downwards, while the lower first atomizing component draws the reaction solution from the bottom cavity of the tank, atomizes it, and sprays it upwards. The two sets of components rotate in opposite directions under the action of the transmission structure, so that the atomized water / solvent and the reaction solution form a counter-mixing, which greatly increases the contact area and mixing efficiency, completely avoids the problem of excessive local concentration, and ensures that the components of the reaction system are evenly distributed.

[0014] 2. The uniformly distributed stirring blades below the tube in this utility model stir the reaction system inside the vessel as a whole during the rotation of the tube. This works in synergy with the opposing jets of the two sets of atomizing components, providing comprehensive coverage from macro-stirring to micro-atomizing mixing. This further improves the uniformity of mixing, ensures the reaction proceeds uniformly and stably, and effectively prevents gelation.

[0015] 3. The pipe fitting of this utility model adopts a double-layer pipe structure with inner and outer coaxiality, which cleverly realizes the separation of the reaction solution reflux channel and the liquid addition channel. At the same time, through the cooperation of components such as rotary joint and shaft outer sleeve, the sealing performance and fluid transmission stability in the rotation state are ensured. The transmission component accurately realizes the reverse rotation of the two sets of atomizing components through the meshing of gear and gear ring. The structure is compact and the transmission is reliable, requiring no additional power source and reducing energy consumption.

[0016] 4. This utility model effectively solves the problem of product performance fluctuation caused by uneven liquid addition in the prior art through uniform liquid addition and efficient mixing, making it easier to control the viscosity, solid content and other indicators of waterborne polyurethane products, significantly improving product quality consistency, and helping to improve production qualification rate and market competitiveness. 5. This utility model can be directly applied to the liquid addition process of various water-based polyurethane reactors without the need for large-scale modification of existing reactors. It is easy to install, simple to operate, and has low maintenance costs. It can meet the needs of different production scenarios and has broad application value. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall liquid addition device for an aqueous polyurethane reactor proposed in this utility model. Figure 2 This is a partial cross-sectional schematic diagram of a uniform liquid addition device for an aqueous polyurethane reactor proposed in this utility model. Figure 3 This is a front view schematic diagram of a uniform liquid addition device for an aqueous polyurethane reactor proposed in this utility model; Figure 4 for Figure 3 Schematic diagram of cross section in the middle AA direction; Figure 5 This is a side view schematic diagram of a uniform liquid addition device for an aqueous polyurethane reactor proposed in this utility model. Figure 6 for Figure 5 Schematic diagram of cross section in the middle BB direction; Figure 7 for Figure 6 Enlarged diagram of point C in the middle.

[0018] In the diagram: 1. Tank; 2. Mounting frame; 3. Motor and reducer unit; 4. First liquid pump; 5. First gear; 6. Pipe fitting; 7. Second gear; 8. First shaft outer sleeve; 9. Rotary joint; 10. Second liquid pump; 11. Stirring blade; 12. Annular pipe; 13. Support pipe; 14. Atomizing nozzle; 15. Third gear; 16. Second shaft outer sleeve; 17. Sealing plate; 18. Baffle plate; 19. Fourth gear; 20. Rotating shaft; 21. Gear ring. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to specific embodiments, so that those skilled in the art can understand it.

[0020] Please see Figures 1-7 This utility model proposes a uniform liquid addition device for an aqueous polyurethane reactor, including a tank body 1, a mounting frame 2, a motor and reducer unit 3, a first liquid pump 4, a pipe fitting 6, a second liquid pump 10, a first atomizing component, a second atomizing component, and a transmission component.

[0021] Tank 1 is a cylindrical reaction vessel. Mounting bracket 2 is fixed to the top of tank 1. Motor and reducer 3 and first liquid pump 4 are fixed through mounting bracket 2. First gear 5 is fixed to the output end of motor and reducer 3. Second gear 7 is fixed to the outer side of the top of pipe fitting 6. First gear 5 and second gear 7 mesh to realize the motor driving the rotation of pipe fitting 6.

[0022] Among them, the pipe fitting 6 is a double-layered pipe with inner and outer coaxiality. The lower end of the inner pipe is connected to the bottom cavity of the tank 1, and the upper end is connected to the water inlet pipe of the first liquid pump 4 through the rotary joint 9. The lower end of the outer pipe is closed, and the upper end is open and rotatably connected to the outer sleeve 8 of the first shaft. The outer sleeve 8 of the first shaft is fixed to the bottom of the mounting bracket 2. The water outlet pipe of the first liquid pump 4 is connected to the outer sleeve 8 of the first shaft. A return liquid channel is formed above the partition 18 between the inner and outer pipes.

[0023] The second shaft outer sleeve 16 is rotatably connected to the outside of the pipe fitting 6. The upper end of the second shaft outer sleeve 16 is rotatably connected to the tank body 1. The sealing plate 17 is connected between the second shaft outer sleeve 16 and the pipe fitting 6, forming a liquid filling ring cavity below the sealing plate 17. The second liquid pump 10 is fixed to the top surface of the tank body 1, and its water outlet pipe is connected to the liquid filling ring cavity for introducing water or solvent.

[0024] Both the first atomizing component and the second atomizing component consist of an annular tube 12, a support tube 13, and an atomizing nozzle 14. The first atomizing component is connected to the return liquid channel of the fitting 6 through the support tube 13, and the second atomizing component is connected to the liquid filling annular cavity through the support tube 13. The atomizing nozzles 14 of the two atomizing components are arranged facing each other.

[0025] In the transmission assembly, the third gear 15 is fixed to the outside of the pipe fitting 6, and the gear ring 21 is fixed to the inner side of the second shaft outer sleeve 16. The upper end of the rotating shaft 20 is rotatably connected to the tank body 1, and the lower end is fixed to the fourth gear 19. The fourth gear 19 meshes with both the third gear 15 and the gear ring 21, realizing the opposite rotation of the second shaft outer sleeve 16 and the pipe fitting 6. The stirring blade 11 below the pipe fitting 6 rotates synchronously with the pipe fitting 6, realizing the overall stirring of the solution inside the tank.

[0026] In operation, the motor and reducer unit 3 starts, driving the pipe 6 to rotate via the meshing of the first gear 5 and the second gear 7. The pipe 6 then drives the first atomizing component and the stirring blade 11 to rotate. Simultaneously, the third gear 15 rotates with the pipe 6, driving the second shaft outer sleeve 16 to rotate in the opposite direction via the meshing of the fourth gear 19 and the gear ring 21. The first liquid pump 4 starts, drawing the reaction solution from the bottom cavity of the tank 1 through the inner tube of the pipe 6 to the return channel, and then atomizing it upwards through the atomizing nozzle 14 of the first atomizing component. The second liquid pump 10 starts, introducing reaction water or solvent into the liquid addition ring cavity, which is then atomized downwards through the atomizing nozzle 14 of the second atomizing component. The atomized water / solvent mixes with the reaction solution. Simultaneously, the stirring blade 11 agitates the solution in the vessel, achieving uniform mixing in all directions.

[0027] This invention effectively solves the defects of existing liquid addition methods through the design of atomized counter-mixing, bidirectional rotation and stirring synergy, ensuring the stability of waterborne polyurethane reaction and product quality, and has significant technical advantages and practical value.

[0028] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Although this utility model has been described in detail with reference to the above embodiments, those skilled in the art can still combine, add, delete, or otherwise adjust the features of the various embodiments of this utility model according to the circumstances without conflict or creative effort, thereby obtaining different technical solutions that do not fundamentally depart from the concept of this utility model. These technical solutions are also within the scope of protection of this utility model.

Claims

1. A uniform liquid addition device for an aqueous polyurethane reactor, characterized in that, include: The tank (1) serves as the reaction vessel; The motor and reducer unit (3) and the first liquid pump (4) are fixed together to the top of the tank (1) by the mounting bracket (2); The fitting (6) is capable of rotating under the drive of the motor and reducer unit (3). The fitting (6) is a double-layered pipe with the inner and outer sides coaxially arranged. The lower end of the inner pipe of the fitting (6) is connected to the bottom cavity of the tank (1), and the upper end is rotatably connected to the water inlet pipe of the first liquid pump (4) through a rotary joint (9). The lower end of the outer pipe of the fitting (6) is closed, and the upper end is open and rotatably connected to the first shaft outer sleeve (8) fixed to the bottom of the mounting bracket (2). The water outlet pipe of the first liquid pump (4) A partition (18) is fixed between the inner and outer tubes of the fitting (6) and the first shaft outer sleeve (8). A return liquid channel is formed above the partition (18) between the inner and outer tube cavities of the fitting (6). A second shaft outer sleeve (16) is rotatably connected to the outside of the fitting (6). A sealing plate (17) is rotatably connected between the second shaft outer sleeve (16) and the fitting (6). A liquid filling ring cavity is formed between the second shaft outer sleeve (16) and the fitting (6) below the sealing plate (17). The second liquid pump (10) is fixed to the top surface of the tank (1). The water inlet pipe of the second liquid pump (10) is used to introduce reaction water or solvent. The water outlet pipe of the second liquid pump (10) is fixed to the sealing plate (17) and communicates with the liquid addition ring cavity. The first atomizing component is fixed to the outside of the pipe (6) and communicates with the return liquid channel; The second atomizing component is fixed outside the second shaft outer sleeve (16) and communicates with the liquid filling ring cavity; A transmission assembly is used to drive the second shaft outer sleeve (16) to rotate in the opposite direction relative to the tube (6).

2. The uniform liquid addition device for an aqueous polyurethane reactor according to claim 1, characterized in that, Both the first atomizing component and the second atomizing component include an annular tube (12), on which a plurality of atomizing nozzles (14) are distributed at equal angles, and a plurality of support tubes (13) are radially connected to the inner side of the annular tube (12).

3. The uniform liquid addition device for an aqueous polyurethane reactor according to claim 2, characterized in that, The support tube (13) of the first atomizing component is fixed to the outer tube of the fitting (6) and communicates with the return liquid channel. The support tube (13) of the second atomizing component is fixed to the outer sleeve (16) of the second shaft and communicates with the liquid filling ring cavity.

4. The uniform liquid addition device for an aqueous polyurethane reactor according to claim 3, characterized in that, The atomizing nozzle (14) of the first atomizing component sprays upward, and the atomizing nozzle (14) of the second atomizing component sprays downward and is directly opposite the atomizing nozzle (14) of the first atomizing component.

5. The uniform liquid addition device for an aqueous polyurethane reactor according to claim 1, characterized in that, The output end of the motor and reducer unit (3) is fixed with a first gear (5), and the top outer side of the pipe fitting (6) is fixed with a second gear (7), and the first gear (5) and the second gear (7) mesh with each other.

6. The uniform liquid addition device for an aqueous polyurethane reactor according to claim 5, characterized in that, The transmission assembly includes a third gear (15), which is fixed outside the pipe (6) and inside the second shaft sleeve (16) above the sealing plate (17). A gear ring (21) is fixed inside the second shaft sleeve (16). A rotating shaft (20) is provided between the third gear (15) and the gear ring (21). The upper end of the rotating shaft (20) is rotatably connected to the tank body (1). A fourth gear (19) is fixed at the lower end of the rotating shaft (20). The fourth gear (19) meshes with the third gear (15) and the gear ring (21).

7. The uniform liquid addition device for an aqueous polyurethane reactor according to claim 1, characterized in that, The tube (6) located below the first atomizing component has several uniformly arranged stirring blades (11) fixed on it.

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